JP2012042155A - Method of operating waste treatment facility, heat insulating device and the waste treatment facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of operating a waste treatment facility enabling heat insulation of dust collectors while suppressing energy consumption.SOLUTION: In a simultaneous operation process, exhaust gas discharged from respective incinerators 13, 23 is independently discharged to outside of the incinerators 13, 23 via the dust collectors 15, 25 and exhaust gas passages 16, 26 with respect to each incinerator system 10, 20. In an one system operation process, the incinerator system on the stopping side performs: an exhaust gas shut-off process of shutting off flowing of gas between the incinerator and the dust collector of the stopped incinerator system and flowing of gas between the dust collector and the exhaust gas passage of the stopped incinerator system; and a thermal energy supplying process of branching part of exhaust gas within the exhaust gas passage in the incinerator system on the operating side from the exhaust gas passage on the operating side to the dust collector side on the stopping side to supply thermal energy of the exhaust gas to inside of the dust collector on the stopping side and of returning the exhaust gas which has supplied thermal energy to inside of the dust collector on the stopping side to the exhaust gas passage on the operating side.

Description

  The present invention relates to a method for operating a waste treatment facility equipped with an incinerator system having an incinerator for thermally decomposing waste and a dust collector for removing dust in exhaust gas discharged from the incinerator.

  Conventionally, in an incinerator apparatus provided with a dust collector downstream of the incinerator in order to remove dust in the exhaust gas discharged from the incinerator, the dust collector is subjected to low temperature corrosion or the like when the incinerator is stopped. In order to suppress this, the dust collector is kept warm. That is, when the incinerator is in operation, high temperature exhaust gas discharged from the incinerator flows into the dust collector to maintain a high temperature, but when the incinerator is shut down, the inflow of the high temperature exhaust gas is stopped. As the temperature inside the dust collector decreases, water drops generated by the dust collectors corrode at low temperature, or ash adheres to the filter cloth through these water drops, causing the filter cloth to become clogged. The dust collector is kept warm when stopped.

  For example, Patent Document 1 discloses an incinerator apparatus having an incinerator and a dust collector (a bag filter in Patent Document 1) for removing dust from exhaust gas discharged from the incinerator. . In this incinerator, the upstream portion and the downstream portion of the dust collector are connected by a circulation duct, and a fan and a heater are provided in the middle of the circulation duct. When the operation of the incinerator is stopped, the exhaust gas discharged from the dust collector is sucked into the circulation duct by the fan and heated by the heater, and the heated exhaust gas is returned to the dust collector. This keeps the dust collector warm.

Japanese Patent No. 3209913

  In the conventional method, the gas flowing into the dust collector is heated by a heater to keep the dust collector warm, and this heater is large in order to keep the temperature inside the dust collector higher than the temperature at which water can evaporate. There is a problem that power is consumed.

  In view of such circumstances, it is an object of the present invention to provide an incinerator system capable of keeping a dust collector warm while keeping energy consumption small.

  In order to solve the above-mentioned problems, the present invention provides a first incinerator for thermally decomposing waste and a first dust collector for removing dust from exhaust gas discharged from the first incinerator. A first incinerator system having a first exhaust gas passage for discharging exhaust gas that has passed through the first dust collector to the outside of the furnace, a second incinerator for thermally decomposing waste, and the second incineration A second incinerator system having a second dust collector for removing dust from exhaust gas discharged from the furnace and a second exhaust gas passage for discharging exhaust gas that has passed through the second dust collector to the outside of the furnace A method for operating a waste treatment facility comprising: a simultaneous operation step of simultaneously operating the first incinerator and the second incinerator during a specific simultaneous operation period; and a single system other than the simultaneous operation period. Stop one of the first and second incinerators during operation In the simultaneous operation step, the exhaust gas discharged from the first incinerator is discharged out of the furnace through the first dust collector and the first exhaust gas passage, (2) Exhaust gas discharged from the incinerator is discharged outside the furnace through the second dust collector and the second exhaust gas passage. In the one-system operation process, the incinerator and the dust collection in the incinerator system on the stop side Exhaust gas shut-off process that shuts off the gas flow to and from the dust collector and the exhaust gas passage, and operates part of the exhaust gas in the exhaust gas passage of the incinerator system on the operating side. Branching from a specific branch of the exhaust gas passage on the side to the dust collector side of the incinerator system on the stop side to supply the thermal energy of this exhaust gas into the dust collector on the stop side, and this dust collector on the stop side After supplying heat energy in Providing waste disposal plant operating method which comprises carrying out the heat energy supply step of returning to the return portion of the downstream side of the branch portion of the exhaust gas passage running side the exhaust gas.

  According to this method, it is possible to appropriately keep the temperatures of the dust collectors while suppressing the energy consumption even during the one-system operation period in addition to the simultaneous operation period.

  That is, in this method, each dust collector is kept warm by the high-temperature exhaust gas discharged from each incinerator during the simultaneous operation period, and is discharged from the operating incinerator during the one-system operation period. The thermal energy of the high-temperature exhaust gas after passing through the dust device is supplied into the stop-side dust collector, and the exhaust-side heat energy heats the stop-side dust collector in addition to the operating-side dust collector. Therefore, in the simultaneous operation period and the one-system operation period, each dust collector can be appropriately kept warm without using a heating means such as a heater or while suppressing energy consumption in the heating means. .

  In particular, when the exhaust gas shut-off process is performed in the one-system operation process, a low temperature gas from the exhaust gas passage of the stopped incinerator or the stopped incinerator system enters the dust collector of the stopped incinerator system. Since the inflow is avoided, the dust collector on the stop side can be efficiently kept warm.

  The exhaust gas after supplying thermal energy to the dust collector on the stop side is returned to the exhaust gas passage on the operation side. The exhaust gas passage of the stop-side incinerator system and the exhaust gas passage provided in the exhaust gas passage are The exhaust gas can be discharged outside the furnace without operating various devices for discharging outside.

  Here, the number of incinerator systems provided in the waste treatment facility is not limited to two, and three or more incinerator systems may be provided.

  For example, when three or more incinerator systems are provided, a part of the exhaust gas in the exhaust gas passage of at least one incinerator system on the operating side is transferred from a specific branch portion of the exhaust gas passage on the operating side to the stop side. What is necessary is just to branch to the dust collector side and supply the thermal energy of this exhaust gas into the dust collector on the stop side. That is, the present invention relates to an incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and an exhaust gas that has passed through the dust collector. An operation method for a waste treatment facility having a plurality of incinerator systems each having an exhaust gas passage for discharging to the outside, wherein all incinerators of the incinerator system are operated during a specific simultaneous operation period. A simultaneous operation process that operates simultaneously, and a single system operation process that operates an incinerator of another incinerator system by stopping an incinerator of a specific incinerator system during a single system operation period other than the simultaneous operation period. In the simultaneous operation process, the exhaust gas discharged from each incinerator is discharged outside the furnace independently from each other through the dust collector and the exhaust gas passage for each incinerator system, and stopped in the one-system operation process. Side incinerator At least one incinerator on the operating side, and an exhaust gas blocking step for blocking a gas flow between the incinerator and the dust collector and a gas flow between the dust collector and the exhaust gas passage in the stem; A part of the exhaust gas in the exhaust gas passage of the system is branched from a specific branch portion of the exhaust gas passage on the operating side to the dust collector side of the incinerator system on the stop side, and the thermal energy of this exhaust gas is stopped on the dust collector on the stop side A heat energy supply step of returning the exhaust gas after supplying thermal energy into the dust collector on the stop side to the return portion downstream of the branching portion in the exhaust gas passage on the operation side. A method for operating a waste treatment facility is provided.

  The present invention further includes a simultaneous stop step of simultaneously stopping the incinerators of the respective incinerator systems during the simultaneous stop period other than the simultaneous operation period and the one-system operation period, and the simultaneous stop step includes an incinerator system. It is preferable that the gas is circulated independently between the dust collector and the heating means each time, and the circulating gas is heated by the heating means (Claim 3).

  If it does in this way, while keeping energy consumption small in the said simultaneous operation period and one system operation period, in addition to these periods, also during each simultaneous stop period, each dust collector can be kept warm appropriately.

  In the present invention, the exhaust gas shut-off step and the thermal energy supply step are after the stop of the incinerator of the stop-side incinerator system, and the temperature in the dust collector of the stop-side incinerator system is It is preferable to start after the temperature falls below a preset reference temperature.

  In this way, while keeping the dust collector appropriately warm, in the thermal energy supply process, the exhaust gas is branched from the exhaust gas passage on the operation side to the dust collector on the stop side, or the branched exhaust gas is supplied to the operation side. The consumption of energy required for returning to the exhaust gas passage can be kept small.

  Further, in the present invention, in the thermal energy supply step, after the exhaust gas branched to the dust collector side of the stop-side incinerator system at the branch portion passes through the stop-side dust collector, It is preferable to return to the return part of the incinerator system on the operating side (Claim 5).

  In this method, since the exhaust gas discharged from the working-side dust collector directly flows into the stop-side dust collector, the thermal energy of the exhaust gas is efficiently supplied to the stop-side dust collector. Can be efficiently heated.

  Here, since the exhaust gas flowing into the stop-side dust collector passes through the operating-side dust collector and the dust is removed by the dust collector, the dust to the stop-side dust collector is It is possible to prevent the dust collector from being clogged by the inflow.

  In the method, the thermal energy supply step includes the step of collecting dust in the stop-side incinerator system at a branch portion of the operation-side incinerator system according to the temperature in the dust collector of the stop-side incinerator system. It is preferable to include a step of adjusting the amount of exhaust gas branched to the apparatus side.

  In this way, it is necessary to branch the exhaust gas to the stop-side dust collector or return the branched exhaust gas to the operation-side exhaust gas passage while keeping the stop-side dust collector properly warm. Energy consumption can be kept small.

  Further, in the present invention, in the thermal energy supply step, gas is circulated between the dust collector of the stop-side incinerator system and the heat exchanger, and at the branch portion of the operation-side incinerator system. A part of the exhaust gas branched from the exhaust gas passage of the operating-side incinerator system to the dust collector side of the stop-side incinerator system is allowed to flow into the heat exchanger and then returned to the operating-side incinerator system In the heat exchanger, heat exchange is performed in a non-contact state between the gas circulating between the dust collector on the stop side and the heat exchanger and the exhaust gas branched at the branch portion. Preferred (claim 7).

  In this method, the exhaust gas discharged from the working-side dust collector does not directly flow into the stop-side dust collector, but only the thermal energy of this exhaust gas flows into the stop-side dust collector through the heat exchanger. Therefore, it is more reliable that the dust collector is corroded as the acidic gas contained in the exhaust gas flows into the dust collector on the stop side while keeping the dust collector on the stop side more appropriate. It is suppressed.

  Here, the exhaust gas flowing into the heat exchanger is the exhaust gas that has passed through the dust collector on the operating side and from which dust has been removed, so that the inflow of dust into the heat exchanger is suppressed. Thus, clogging of the heat exchanger due to the dust is suppressed.

  In the method using the heat exchanger, in the thermal energy supply step, the operation-side incineration is performed at the branch portion according to the temperature in the dust collector of the stop-side incinerator system or the temperature of the heat exchanger. It is preferable to include a step of adjusting the amount of exhaust gas branched from the exhaust gas passage of the furnace system to the dust collector side of the incinerator system on the stop side.

  In this way, it is necessary to branch the exhaust gas to the stop-side dust collector or return the branched exhaust gas to the operation-side exhaust gas passage while keeping the stop-side dust collector properly warm. Energy consumption can be kept small.

  The present invention also provides a first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and the first dust collector. A first incinerator system having a first exhaust gas passage for discharging the exhaust gas that has passed through the furnace to the outside of the furnace, a second incinerator for thermally decomposing waste, and the exhaust gas discharged from the second incinerator Waste comprising a second dust collector for removing dust from the inside and a second incinerator system having a second exhaust gas passage for discharging exhaust gas that has passed through the second dust collector to the outside of the furnace A heat retention device provided in a treatment facility for retaining a dust collector of an incinerator system including the stopped incinerator when one of the first incinerator and the second incinerator is stopped. And a gas flow between the first incinerator and the first dust collector. And a first exhaust gas blocking means capable of switching between a closed state and a state in which a gas flow path between the first dust collector and the first exhaust gas passage is opened, the second incinerator, and the second dust collector. A second exhaust gas blocking means capable of switching between a state in which the gas flow path between the second dust collector and the gas flow path between the second dust collector and the second exhaust gas passage is opened and a closed state; A first branch passage that communicates the specific first branch portion and the second dust collector, and a second branch passage that communicates the specific second branch portion of the second exhaust gas passage and the first dust collector. A first return passage communicating the first return portion downstream of the branch portion of the first exhaust gas passage and the second dust collector, and a downstream side of the branch portion of the second exhaust gas passage. A second return passage communicating the second return portion and the first dust collector, and the first exhaust gas passage. A part of the exhaust gas is sucked into the first branch passage so that the exhaust gas flows into the second dust collector through the first branch passage and then returns to the first exhaust gas passage through the first return passage. A possible first suction means and a part of the exhaust gas in the second exhaust gas passage through the second return passage after the exhaust gas flows into the first dust collector through the second branch passage; A second suction means capable of sucking into the second branch passage so as to return to the passage, and a first branch passage switchable between a state in which the first branch passage and the first return passage are opened and a state in which the first branch passage is closed; A heat retention device comprising: an opening / closing means; and a second branch passage opening / closing means capable of switching between a state where the second branch passage and the second return passage are opened and closed. ).

  If this apparatus is used, it is possible to appropriately keep the temperature of each dust collector while suppressing the energy consumption even during the one-system operation period in addition to the simultaneous operation period.

  That is, in this apparatus, during the simultaneous operation period, high-temperature exhaust gas discharged from the incinerator for each incinerator system can be caused to flow into the dust collector, and each dust collector can be kept warm by each exhaust gas. Then, during the one-system operation period, the high-temperature exhaust gas discharged from the operating incinerator and passing through the active-side dust collector is caused to flow into the stop-side dust collector, and the thermal energy of this exhaust gas is Thus, in addition to the dust collector on the operating side, the dust collector on the stop side can be heated. Therefore, when at least one of the incinerators is in operation, each dust collector can be appropriately kept warm without using heating means such as a heater or while suppressing energy consumption in the heating means. it can.

  Specifically, during the simultaneous operation period, the first and second exhaust gas blocking means open the gas flow path between each incinerator and each dust collector and the gas flow path between each dust collector and each exhaust gas passage. On the other hand, the first and second branch passages and the first and second return passages are closed by the first and second branch passage opening / closing means, thereby being discharged from each incinerator. Exhaust gas can flow into each dust collector.

  When only the first incinerator is operating, the second exhaust gas blocking means causes the gas flow path between the second incinerator and the second dust collector and between the second dust collector and the second exhaust gas passage. Is closed, and the first branch passage and the first return passage are opened by the first branch passage opening / closing means, while the second branch passage and the second return passage are opened by the second branch passage opening / closing means. (2) High-temperature exhaust gas discharged from the first incinerator by making the return passage closed and sucking the exhaust gas in the first exhaust passage toward the first branch passage by the first suction means Can flow into the second dust collector. Further, when only the second incinerator is operating, the open / closed state of each flow path or passage is opposite to the case where only the first incinerator is operating by each exhaust gas blocking means and each branch passage opening / closing means. The exhaust gas in the second exhaust gas passage is sucked into the second branch passage side by the second suction means, and the high temperature exhaust gas discharged from the second incinerator is collected in the first dust collector. Can be allowed to flow into.

  Here, the heat retaining device may be applied to a waste treatment facility provided with three or more incinerator systems. That is, the present invention relates to an incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and an exhaust gas that has passed through the dust collector. Stopped when at least one incinerator of the plurality of incinerator systems is provided in a waste treatment facility equipped with a plurality of incinerator systems each having an exhaust gas passage for discharging outside. A heat retaining device for retaining the dust collector of the incinerator system including the incinerator, wherein the gas passage between the incinerator and the dust collector is provided in each incinerator system individually, and Exhaust gas blocking means capable of switching between a state in which a gas flow path between the dust collector and the exhaust gas passage is opened and closed, a specific branch portion of the exhaust gas passage of each incinerator system, and another incinerator Shi A branch passage that communicates with each dust collector of the system, a return passage that communicates with a return portion downstream of the branch portion of the exhaust gas passage of each incinerator system and a dust collector of another incinerator system, respectively A part of the gas in the exhaust gas passage of each incinerator system returns to the exhaust gas passage of each incinerator system through the return passage after the exhaust gas flows into the dust collector of the other incinerator system through the branch passage. As described above, it comprises suction means capable of sucking into the branch passages, and branch passage opening / closing means capable of switching between a state in which the branch passages and the return passages are opened and closed, respectively. A heat retention device is included (claim 10).

  The present invention also provides a first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and the first dust collector. A first incinerator system having a first exhaust gas passage for discharging the exhaust gas that has passed through the furnace to the outside of the furnace, a second incinerator for thermally decomposing waste, and the exhaust gas discharged from the second incinerator Waste comprising a second dust collector for removing dust from the inside and a second incinerator system having a second exhaust gas passage for discharging exhaust gas that has passed through the second dust collector to the outside of the furnace A heat retention device provided in a treatment facility for retaining a dust collector of an incinerator system including the stopped incinerator when one of the first incinerator and the second incinerator is stopped. A heat exchanger that exchanges heat between two fluids in a non-contact state The gas flow path between the first incinerator and the first dust collector and the gas flow path between the first dust collector and the first exhaust gas passage can be switched between a opened state and a closed state. The first exhaust gas blocking means, the gas passage between the second incinerator and the second dust collector, and the gas passage between the second dust collector and the second exhaust passage are opened and closed. A second exhaust gas blocking means switchable to a state, a first inflow portion for allowing gas to flow into the heat exchanger from the first incinerator system side, and the heat exchanger from the second incinerator system side A second inflow part for allowing gas to flow into the first inflow part, and a first outflow part for discharging the gas that has flowed into the heat exchanger from the first inflow part to the first incinerator system side from the heat exchanger; , Gas flowing into the heat exchanger from the second inflow portion from the heat exchanger A second outflow part for discharging to the second incinerator system side, a first heat retaining gas outflow passage communicating the first inflow part and the first dust collector, the second inflow part and the second A second heat retaining gas outflow passage communicating with the two dust collectors, a first heat retaining gas inflow passage communicating between the first outflow portion and the first dust collecting device, the second outflow portion and the second collection. A second heat retaining gas inflow passage communicating with the dust device, a first branch passage communicating with the first inflow portion and a specific first branch portion of the first exhaust gas passage, the second inflow portion and the first (2) The second branch passage communicating with the specific second branch portion of the exhaust gas passage, and the first outlet portion and the first return portion downstream of the first branch portion of the first exhaust gas passage are communicated. The first return passage, the second outflow portion, and the second return portion on the downstream side of the second branch portion of the second exhaust gas passage are connected to each other. A second return passage through which the gas flows in the first inflow portion or the first outflow portion so that the gas flows from the first inflow portion to the first outflow portion via the heat exchanger. Means, and a second suction means for sucking the gas in the second inflow part or the second outflow part so that the gas flows from the second inflow part to the second outflow part via the heat exchanger, A first heat insulation gas passage opening / closing means capable of switching between a state in which the one heat insulation gas inflow passage and the first heat insulation gas outflow passage are opened and closed, a second heat insulation gas inflow passage and a second heat insulation gas outflow passage; A second heat retaining gas passage opening / closing means capable of switching between an open state and a closed state; and a first branch passage capable of switching between a state where the first branch passage and the first return passage are opened and a closed state. Opening and closing means and said second part Including thermal insulation device characterized in that it comprises a second branch passage switching means capable of switching to a state of being closed in a state that opens the passage and the second return passage (claim 11).

  If this apparatus is used, it is possible to appropriately keep the temperature of each dust collector while suppressing the energy consumption even during the one-system operation period in addition to the simultaneous operation period.

  That is, in this apparatus, during the simultaneous operation period, high-temperature exhaust gas discharged from the incinerator for each incinerator system can be caused to flow into the dust collector, and each dust collector can be kept warm by each exhaust gas. Then, during the one-system operation period, the high-temperature exhaust gas discharged from the operating incinerator and passing through the active-side dust collector is caused to flow into the stop-side dust collector, and the thermal energy of this exhaust gas is Thus, in addition to the dust collector on the operating side, the dust collector on the stop side can be heated. Therefore, when at least one of the incinerators is in operation, each dust collector can be appropriately kept warm without using heating means such as a heater or while suppressing energy consumption in the heating means. it can.

  In particular, since the exhaust gas discharged from the working-side dust collector does not flow directly into the stop-side dust collector, only the thermal energy of this exhaust gas flows into the stop-side dust collector through the heat exchanger. While keeping the temperature of the dust collector on the stop side appropriately, it is possible to suppress the dust collector from corroding as the acidic gas contained in the exhaust gas flows into the dust collector on the stop side.

  Specifically, when both incinerators are in operation, the gas flow paths between the incinerators and the dust collectors and the gas flows between the dust collectors and the exhaust gas passages by the exhaust gas blocking means. While the passage is opened, the branch passages and return passages are closed by the branch passage opening / closing means and the heat retaining gas passage opening / closing means, thereby being discharged from each incinerator. Exhaust gas can flow into each dust collector.

  On the other hand, when only the first incinerator is operating, the gas passages between the second incinerator and the second dust collector and between the second dust collector and the second exhaust gas passage are provided by the exhaust gas blocking means. While the closed state is established, the gas flow paths between the first incinerator and the first dust collector and between the first dust collector and the first exhaust gas passage are opened, and the branch passage opening / closing means opens the first passage. The first branch passage and the first return passage are opened, the second branch passage and the second return passage are closed, and the first heat retaining gas inflow passage is opened by the heat retaining gas passage opening / closing means. The first heat retaining gas outflow passage is closed, while the second heat retaining gas inflow passage and the second heat retaining gas outflow passage are opened, and the gas in each inflow portion or each outflow portion is provided by each suction means. Aspirate.

  Thereby, the high-temperature exhaust gas discharged from the first incinerator is caused to flow into the heat exchanger while circulating the gas between the second dust collector and the heat exchanger, and heat exchange between these gases can be achieved. it can. That is, the gas flowing into the second dust collector can be heated by the high-temperature exhaust gas, and the second dust collector can be kept warm by this gas. In addition, when only the second incinerator is operating, the open / close state of each flow path or passage is changed only by the first incinerator by the exhaust gas blocking means, the insulated gas passage opening / closing means and the branch passage opening / closing means. By switching to a state opposite to when the is operating, the high-temperature exhaust gas discharged from the second incinerator flows into the heat exchanger while circulating the gas between the first dust collector and the heat exchanger. Thus, heat exchange can be performed between these gases.

  The present invention also provides a first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and the first dust collector. A first incinerator system having a first exhaust gas passage for discharging the exhaust gas that has passed through the furnace to the outside of the furnace, a second incinerator for thermally decomposing waste, and the exhaust gas discharged from the second incinerator A second incinerator system having a second dust collector for removing dust from the inside and a second exhaust gas passage for discharging the exhaust gas that has passed through the second dust collector to the outside of the furnace; A heat retaining device for retaining heat of the dust device and the second dust collector, wherein the heat retaining device includes a gas flow path between the first incinerator and the first dust collector, and the first dust collector; The gas flow path between the first exhaust gas passages is switched between the open state and the closed state. A replaceable first exhaust gas blocking means, a gas flow path between the second incinerator and the second dust collector, and a gas flow path between the second dust collector and the second exhaust gas passage; A second exhaust gas blocking means capable of switching to a closed state, a first branch passage communicating the specific first branch portion of the first exhaust gas passage with the second dust collector, and the second exhaust gas passage. A second branch passage that communicates the specific second branch portion with the first dust collector, a first return portion downstream of the branch portion of the first exhaust gas passage, and the second dust collector. A first return passage communicating with the second exhaust passage, a second return passage communicating with the second return portion downstream of the branch portion of the second exhaust gas passage, and the first dust collecting device, and in the first exhaust gas passage Before a part of the exhaust gas flows into the second dust collector through the first branch passage. The first suction means that can be sucked into the first branch passage so as to return to the first exhaust passage through the first return passage, and a part of the exhaust gas in the second exhaust passage, A second suction means capable of sucking into the second branch passage so as to return to the second exhaust gas passage through the second return passage after flowing into the first dust collector through the branch passage; and the first branch passage. The first branch passage opening / closing means that can be switched between a state in which the first return passage is opened and a state in which the first return passage is closed, and a state in which the second branch passage and the second return passage are opened, and a state in which the first return passage is closed can be switched. A waste treatment facility including a second branch passage opening / closing means.

  The present invention also provides an incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and an exhaust gas that has passed through the dust collector. A plurality of incinerator systems each having an exhaust gas passage for discharging to the outside, and a collection of incinerator systems including the incinerators stopped when at least one incinerator of the plurality of incinerator systems is stopped A heat retaining device for retaining the dust device, wherein the heat retaining device is individually provided in each incinerator system, a gas flow path between the incinerator and the dust collector, and the dust collector; Exhaust gas blocking means capable of switching between a gas flow path between the exhaust gas passages and a closed state, a specific branch portion of the exhaust gas passage of each incinerator system, and a dust collector of another incinerator system And A branch passage communicating with each other, a return passage communicating with a return portion downstream of the branch portion of the exhaust gas passage of each incinerator system and a dust collector of another incinerator system, and each incinerator A portion of the gas in the exhaust gas passage of the system is branched so that the exhaust gas flows into the dust collector of another incinerator system through the branch passage and then returns to the exhaust gas passage of each incinerator system through the return passage. A waste treatment facility comprising: suction means capable of sucking in the passages; and branch passage opening / closing means switchable between a state in which the branch passages and the return passages are opened and closed. (Claim 13).

  The present invention also provides a first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and the first dust collector. A first incinerator system having a first exhaust gas passage for discharging the exhaust gas that has passed through the furnace to the outside of the furnace, a second incinerator for thermally decomposing waste, and the exhaust gas discharged from the second incinerator A second dust collector for removing dust from the inside, a second incinerator system having a second exhaust gas passage for discharging exhaust gas that has passed through the second dust collector to the outside of the furnace, and the first dust collector And a heat retaining device for retaining the temperature of the second dust collecting device, the heat retaining device being a heat exchanger for exchanging heat between two fluids in a non-contact state, the first incinerator, and the first collecting device. Gas flow path between the dust devices and between the first dust collector and the first exhaust gas passage A first exhaust gas blocking means that can be switched between a state in which the gas flow path is opened and a state in which it is closed; a gas flow path between the second incinerator and the second dust collector; and a second dust collector; A second exhaust gas blocking means capable of switching between a state in which a gas flow path between the second exhaust gas passages is opened and a state in which it is closed; and a gas for flowing into the heat exchanger from the first incinerator system side A first inflow part, a second inflow part for allowing gas to flow into the heat exchanger from the second incinerator system side, and a gas that has flowed into the heat exchanger from the first inflow part. A first outflow part for discharging from the heat exchanger to the first incinerator system side, and a gas flowing into the heat exchanger from the second inflow part from the heat exchanger to the second incinerator system side The second outflow part, the first inflow part and the first dust collector The first heat retaining gas outflow passage communicating with the second heat retaining gas outflow passage communicating with the second inflow portion and the second dust collecting device, the first outflow portion and the first dust collecting device communicating with each other. A first heat retaining gas inflow passage, a second heat retaining gas inflow passage communicating the second outflow portion and the second dust collector, a specific first branch portion of the first inflow portion and the first exhaust gas passage. A first branch passage that communicates with the first branch passage, a second branch passage that communicates the second inflow portion with a specific second branch portion of the second exhaust gas passage, and the first outflow portion and the first exhaust gas passage. A first return passage communicating with a first return portion downstream from the first branch portion; a second return portion downstream from the second branch portion of the second outflow portion and the second exhaust gas passage; Gas flows from the first inflow portion to the first outflow portion via the heat exchanger. The first suction means for sucking the gas in the first inflow portion or the first outflow portion, and the second so that the gas flows from the second inflow portion to the second outflow portion via the heat exchanger. A second suction means for sucking the gas in the inflow portion or the second outflow portion, and a first heat retaining gas that can be switched between a state in which the first heat retaining gas inflow passage and the first heat retaining gas outflow passage are opened and closed; Passage opening / closing means, second heat insulation gas passage opening / closing means switchable between a state where the second heat insulation gas inflow passage and the second heat insulation gas outflow passage are opened and a state where the passage is closed, the first branch passage and the first A first branch passage opening / closing means capable of switching between a state where the return passage is opened and a state where the return passage is closed; and a second branch which is switchable between a state where the second branch passage and the second return passage are opened and a state where the return passage is closed. Branch passage opening and closing Including waste treatment facility, characterized in that it comprises a stage (claim 14).

  As described above, according to the present invention, it is possible to keep the dust collecting apparatus warm while keeping the consumed energy small.

It is the schematic which shows the whole structure of the waste disposal facility which concerns on embodiment of this invention. It is the schematic which shows the structure of the heat retention apparatus vicinity of the waste disposal facility which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the operation procedure and gas flow when a 1st incinerator is stopped in the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure and gas flow when a 1st incinerator and a 2nd incinerator are stopped in the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure of the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure of the heat retention apparatus shown in FIG. It is the schematic which shows the structure of the heat retention apparatus vicinity of the waste disposal facility which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating the operation procedure and gas flow when a 1st incinerator is stopped in the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure and gas flow when a 1st incinerator and a 2nd incinerator are stopped in the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure of the heat retention apparatus shown in FIG. It is a figure for demonstrating the operation procedure of the heat retention apparatus shown in FIG.

  A preferred first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of a waste treatment facility 1 according to a first embodiment including two incinerator systems 10 and 20 (first incinerator system 10 and second incinerator system 20) and a heat retaining device 60. FIG. FIG. 2 is a diagram showing a configuration in the vicinity of the heat retaining device 60 of the waste treatment facility 1.

  The first incinerator system 10 includes, in order from the upstream side, a first garbage pit 11, a first dust feeder 12, a first incinerator 13, a first upstream exhaust gas passage 14, a first bag filter ( A first dust collecting device 15, a first exhaust gas passage 16, a first induction fan 18, and a first chimney 19.

  The second incinerator system 20 has the same structure as that of the first incinerator system 10, and in order from the upstream side, a second garbage pit 21, a second dust feeder 22, and a second incinerator. 23, a second upstream exhaust gas passage 24, a second bag filter (second dust collector) 25, a second exhaust gas passage 26, a second induction fan 28, and a second chimney 29. .

  Each said incinerator 13 and 23 is an apparatus for processing to-be-processed objects, such as a waste material, by thermal decomposition. Examples of the incinerators 13 and 23 include a fluidized bed combustion furnace, an ash melting furnace, a gasification melting furnace, and a stoker furnace. Wastes stored in the garbage pits 11 and 21 are quantitatively supplied to the incinerators 13 and 23 through the dust feeders 12 and 22, respectively. Each incinerator 13 and 23 thermally decomposes the waste supplied by the dust feeders 12 and 22. From the incinerators 13 and 23, high-temperature exhaust gas containing acid gas such as sulphite gas and dust such as ash is discharged along with the thermal decomposition treatment of the waste.

  The operation of the incinerators 13 and 23 is appropriately stopped for inspection or the like. The incinerators 13 and 23 may be stopped only in one incinerator or in both incinerators at the same time. That is, in the present waste treatment facility 1, a simultaneous operation process in which both the first incinerator 13 and the second incinerator 23 are operating simultaneously during the simultaneous operation period, and the first incinerator 13 and the second incinerator 23. A single system operation process in which only one of them is operating and a simultaneous stop process in which both the first incinerator 13 and the second incinerator 23 are stopped are appropriately performed.

  Each of the bag filters 15 and 25 is a device for removing dust such as ash in the exhaust gas discharged from the incinerators 13 and 23. A filter cloth capable of adsorbing dust is provided inside the bag filters 15 and 25, and the dust is adsorbed by the filter cloth and removed from the exhaust gas.

  The first bag filter 15 communicates with the first incinerator 13 through the first upstream exhaust gas passage 14 and removes dust in the exhaust gas discharged from the first incinerator 13. The second bag filter 25 communicates with the second incinerator 23 through the second upstream exhaust gas passage 24 and removes dust in the exhaust gas discharged from the second incinerator 23.

  The induction fans 18 and 28 are for sucking the exhaust gas in the exhaust gas passages 16 and 26 toward the chimneys 19 and 29. The exhaust gas sucked by the induction fans 18 and 28 is discharged from the chimneys 19 and 29 to the outside of the furnace.

  Here, dust such as ash is accumulated in each of the bag filters 15 and 25 as dust in the exhaust gas is removed. Therefore, when the temperature in the bag filters 15 and 25 is lower than the dew point, dust such as ash is fixed through water and the filter cloth of the bag filters 15 and 25 is clogged, or the bag filters 15 and 25 are clogged. The metal part in the bag filter may corrode at low temperature due to the acid gas remaining in the filter. The heat retaining device 60 is a device for retaining the bag filters 15 and 25 in order to suppress such low temperature corrosion of the bag filters 15 and 25.

  Details of the heat retaining device 60 will be described next.

  The heat retaining device 60 includes a first branch passage 61, a first return passage 62, a first fan (first suction means) 63, a first bypass passage 64, and a first heater (heating means) 65. is doing. The heat retaining device 60 includes a second branch passage 71, a second return passage 72, a second fan (second suction means) 73, a second bypass passage 74, and a second heater (heating means) 75. have.

  Further, the heat retaining device 60 opens and closes each passage, that is, as a damper for switching between a state where each passage is opened and a state where it is closed, a first upstream main damper (first exhaust gas blocking means) 14a and A first downstream main damper (first exhaust gas blocking means) 16a, a first passage side branch damper (first branch passage opening / closing means) 61a, a first filter side branch damper (first branch passage opening / closing means) 61b, The first passage side return damper (first branch passage opening / closing means) 62a, the first filter side return damper (first branch passage opening / closing means) 62b, the first upstream bypass damper 64a, and the first downstream bypass damper. 64b, a second upstream main damper (second exhaust gas blocking means) 24a, a second downstream main damper (second exhaust gas blocking means) 26a, and a second passage side branch damper (second branch passage). Closing means) 71a, second filter side branch damper (second branch passage opening / closing means) 71b, second passage side return damper (second branch passage opening / closing means) 72a, and second filter side return damper (second branch). Passage opening / closing means) 72b, a second upstream bypass damper 74a, and a second downstream bypass damper 74b.

  In the following, as a procedure for operating the damper, making the corresponding passage open is called opening the damper, and making the corresponding passage closed is called closing the damper.

  The first branch passage 61 is a passage that communicates the predetermined first branch portion 16 b of the first exhaust gas passage 16 and the second bag filter 25. The first return passage 62 is a passage that communicates the first return portion 16 c downstream of the first branch portion 16 b of the first exhaust gas passage 16 and the second bag filter 25. The first branch passage 61 and the first return passage 62 are connected to portions of the second bag filter 25 that are separated from each other. In the present embodiment, the first branch passage 61 is connected to a portion near the upstream end of the second bag filter 25 and different from the connection portion of the second upstream exhaust gas passage 24. The first return passage 62 is connected to a portion near the downstream end of the second bag filter 25 and different from the connection portion of the second exhaust gas passage 26. Here, the vicinity of the upstream end of the bag filter refers to the upstream side of the filter cloth of the bag filter, and the vicinity of the downstream end of the bag filter refers to the downstream side of the filter cloth of the bag filter.

  The first upstream main damper 14 a is provided in the first upstream exhaust gas passage 14 and opens and closes the first upstream exhaust gas passage 14. The first downstream main damper 16 a is provided in the first exhaust gas passage 16 and opens and closes the first exhaust gas passage 16.

  The first passage side branch damper 61a and the first filter side branch damper 61b open and close the first branch passage 61, respectively. The first passage side branch damper 61 a is provided in the first branch passage 61 near the connection portion of the first exhaust gas passage 16. The first filter side branch damper 61 b is provided in the first branch passage 61 near the connection portion of the second bag filter 25.

  The first passage side return damper 62a and the first filter side return damper 62b open and close the first return passage 62, respectively. The first passage-side return damper 62 a is provided in the first return passage 62 near the connection portion of the first exhaust gas passage 16. The first filter side return damper 62 b is provided in the vicinity of the connection portion of the second bag filter 25 in the first return passage 62.

  The first bypass passage 64 is a passage that communicates the first branch passage 61 and the first return passage 62. The first bypass passage 64 includes a portion of the first branch passage 61 between the first passage-side branch damper 61 a and the first filter-side branch damper 61 b, and a first passage-side return damper of the first return passage 62. The part between 62a and the 1st filter side return damper 62b is connected. The first heater 65 is provided in the middle of the first bypass passage 64 and heats the gas passing through the first bypass passage 64.

  The first upstream bypass damper 64a and the first downstream bypass damper 64b open and close the first bypass passage 64, respectively. The first upstream bypass damper 64 a is provided between the connection portion of the first branch passage 61 in the first bypass passage 64 and the first heater 65. The first downstream bypass damper 64 b is provided between a connection portion of the first return passage 62 in the first bypass passage 64 and the first heater 65.

  The first fan 63 is for sucking the gas in the first return passage 62 from the second bag filter 25 side to the first exhaust gas passage 16 side. The first fan 63 is provided between the connection portion of the first bypass passage 64 in the first return passage 62 and the first filter-side return damper 62b.

  The second branch passage 71 is a passage that communicates the predetermined second branch portion 26 b of the second exhaust gas passage 26 with the first bag filter 15. The second return passage 72 is a passage that communicates the first return filter 26 c and the first bag filter 15 downstream of the second branch portion 26 b of the second exhaust gas passage 26. The second branch passage 71 and the second return passage 72 are connected to portions of the first bag filter 15 that are separated from each other. In the present embodiment, the second branch passage 71 is connected to a portion near the upstream end of the first bag filter 15 and different from the connection portion of the first upstream exhaust gas passage 14. The second return passage 72 is connected to a portion near the downstream end of the first bag filter 15 and different from the connection portion of the first exhaust gas passage 16.

  The second upstream main damper 24 a is provided in the second upstream exhaust gas passage 24 and opens and closes the second upstream exhaust gas passage 24. The second downstream main damper 26 a is provided in the second exhaust gas passage 26 and opens and closes the second exhaust gas passage 26.

  The second passage side branch damper 71a and the second filter side branch damper 71b open and close the second branch passage 71, respectively. The second passage side branch damper 71 a is provided in the vicinity of the connection portion of the second exhaust passage 26 in the second branch passage 71. The second filter side branch damper 71 b is provided in the second branch passage 71 near the connection portion of the first bag filter 15.

  The second passage side return damper 72a and the second filter side return damper 72b open and close the second return passage 72, respectively. The second passage side return damper 72 a is provided in the vicinity of the connection portion of the second exhaust passage 26 in the second return passage 72. The second filter side return damper 72 b is provided in the vicinity of the connection portion of the first bag filter 15 in the second branch passage 71.

  The second bypass passage 74 is a passage that communicates the second branch passage 71 and the second return passage 72. The second bypass passage 74 includes a portion of the second branch passage 71 between the second passage-side branch damper 71 a and the second filter-side branch damper 71 b and a second passage-side return damper of the second return passage 72. The part between 72a and the 2nd filter side return damper 72b is connected. The second heater 75 is provided in the middle of the second bypass passage 74 and heats the gas passing through the second bypass passage 74.

  The second upstream bypass damper 74a and the second downstream bypass damper 74b open and close the second bypass passage 74, respectively. The second upstream bypass damper 74 a is provided between the connection portion of the second branch passage 71 in the second bypass passage 74 and the second heater 75. The second downstream bypass damper 74 b is provided between the connection portion of the second return passage 72 in the second bypass passage 74 and the second heater 75.

  The second fan 73 is for sucking the gas in the second return passage 72 from the first bag filter 15 side to the second exhaust gas passage 26 side. The second fan 73 is provided between the connection portion of the second bypass passage 74 in the second return passage 72 and the second filter side return damper 72b.

  Next, an operation procedure of the heat retaining device 60 in the simultaneous operation process, the single system operation process, and the simultaneous stop process will be described. FIG. 5 shows the operation state of each damper in each step. In FIG. 5, a circle indicates that the damper is opened, and a cross indicates that the damper is closed. FIG. 6 shows the operating state of each fan and the operating state of each heater. Here, it is assumed that the heat retaining device 60 is operated by an operator.

(1) Simultaneous operation process During the simultaneous operation period in which this simultaneous operation process is carried out, the high-temperature gas discharged from each incinerator 13, 23 flows independently into each bag filter 15, 25 and each exhaust gas. It discharges outside the furnace independently through the passages 16 and 26.

  Specifically, the first upstream main damper 14a, the first downstream main damper 16a, the second upstream main damper 24a, and the second downstream main damper 26a are opened, and the bag filters from the incinerators 13 and 23 are opened. Inflow of gas into the 15, 16 and inflow of gas from the bag filters 15, 16 into the exhaust gas passages 16, 17 are enabled.

  On the other hand, the first passage-side branch damper 61a, the first passage-side return damper 62a, the second passage-side branch damper 71a, and the second passage-side return damper 72a are closed, and the branch passages 61, 71 and the return passages 62 and 72 are prohibited from flowing gas.

  Further, the first filter side branch damper 61b, the first filter side return damper 62b, the second filter side branch damper 71b, and the second filter side return damper 72b are closed, and the branch passages 61, 71 and the return passages 62 and 72 are prohibited from flowing gas.

  Then, the first attracting fan 18 and the second attracting fan 28 are operated. Here, in the simultaneous operation process, the first fan 63 and the second fan 73 and the first heater 65 and the second heater 75 are stopped.

  By the above operation, the high temperature exhaust gas discharged from the first incinerator 13 flows into the first bag filter 15, and then does not flow into the first branch passage 61 and the first return passage 62. 16 is discharged from the first chimney 19 to the outside of the furnace. Similarly, the high temperature exhaust gas discharged from the second incinerator 23 flows into the second bag filter 25 and then passes through the second exhaust gas passage 26 without flowing into the second branch passage 71 and the second return passage 72. It is discharged from the second chimney 29 outside the furnace. The flow of the exhaust gas in this simultaneous operation process is indicated by a broken line in FIG.

  As described above, in the simultaneous operation process, the high-temperature gas discharged from each incinerator 13, 23 independently flows into each bag filter 15, 25 and independently outside the furnace via each exhaust gas passage 16, 26. The high temperature gas can be efficiently discharged out of the furnace while keeping the bag filters 15 and 25 at a high temperature by the high temperature gas discharged from the incinerators 13 and 23. Further, inflow of exhaust gas to the first fan 63 and the second fan 73 provided in the branch passages 61 and 71 is avoided, and the fans 63 and 74 are damaged early due to adhesion of ash in the exhaust gas. To be suppressed. The temperature of the exhaust gas flowing into the bag filter from the operating incinerator is about 150 ° C. or higher.

  2 and 5 show a case where the bypass dampers 64a, 64b, 74a, 74b are closed. In this simultaneous operation process, the bypass dampers 64a, 64b, 74a, 74b The open / close state does not matter.

(2) One-system operation process During the one-system operation period in which this one-system operation process is performed, the inflow of gas from the stopped incinerator and exhaust gas passage to the stop-side bag filter is stopped (exhaust gas cutoff process). ). Then, a part of the high-temperature exhaust gas discharged from the operating incinerator and passing through the operation-side bag filter is caused to flow into the stop-side bag filter, and the exhaust gas that has passed through the stop-side bag filter is allowed to flow. It returns to the working side exhaust gas passage and is discharged out of the furnace from the working side chimney together with other exhaust gases discharged from the working side bag filter (thermal energy supply step).

  The exhaust gas shut-off process and the thermal energy supply process are started after one incinerator is stopped during the one-system operation period and then the temperature in the stop-side bag filter is lowered below a preset reference temperature. The Immediately after the incinerator is stopped, the temperature of the incinerator is maintained at a high temperature, and high-temperature gas is discharged from the incinerator. Therefore, immediately after the incinerator is stopped, each filter is kept warm by the high-temperature gas discharged from each incinerator, as in the simultaneous operation process. As a result, as will be described later, the time for operating the first fan 63 or the second fan 73 in the thermal energy supply step can be shortened, and the energy consumption of this fan can be kept small. The reference temperature is 120 ° C., for example. Here, temperature sensors (not shown) for measuring the internal temperatures of the bag filters 15 and 25 are attached to the bag filters 15 and 25, respectively, and the operator selects the exhaust gas according to the values of the temperature sensors. A shut-off process and a heat energy supply process are performed.

  (2-1) When the first incinerator 13 is stopped and only the second incinerator 23 is operating, the specific operation procedure of the heat retaining device 60 in the exhaust gas shut-off process and the thermal energy supply process; (2-2) The case where the second incinerator 23 is stopped and only the first incinerator 13 is operating will be described separately.

(2-1) When the first incinerator is stopped In this case, the first incinerator 13 and the first upstream main damper 14a and the first downstream main damper 16a are closed and stopped. Inflow of gas from the first exhaust gas passage 16 into the first bag filter 15 is prohibited. On the other hand, the second upstream main damper 24a and the second downstream main damper 26a are opened, gas flows from the second incinerator 23 to the second bag filter 25, and from the second bag filter 25 to the second exhaust gas passage 26. Gas inflow.

  Further, the second passage side branch damper 71a, the second filter side branch damper 71b, the second passage side return damper 72a, and the second filter side return damper 72b are opened, and the second branch passage 71 and the second return passage 72 are opened. The gas can be circulated between the second exhaust gas passage 26 and the first bag filter 15 via. At this time, the second upstream bypass damper 74a and the second downstream bypass damper 74b are closed, and the gas is bypassed between the second branch passage 71 and the second return passage 72 via the second bypass passage 74. Do not do it.

  Further, the first filter side branch damper 61b and the first filter side return damper 62b are closed, and the inflow of gas from the second bag filter 25 to the first branch path 61 and the first return path 62 is prohibited.

  Then, the second fan 73 is operated to suck the gas in the second return passage 72 from the first bag filter 15 side to the second exhaust gas passage 26 side. Further, the second attracting fan 28 is operated. Meanwhile, the first attracting fan 18, the first fan 63, the first heater 65, and the second heater 75 are stopped.

  The rotational speed of the second fan 73 is changed according to the temperature in the first bag filter 15 detected by the temperature sensor. Specifically, the operator increases the rotational speed of the second fan 73 when the detected value of the temperature sensor is lower than a preset heat retention temperature (for example, 120 ° C.), and the detected value is equal to or higher than the heat retention temperature. In this case, the rotational speed of the second fan 73 is decreased.

  Through the above operation, the high-temperature exhaust gas discharged from the operating second incinerator 23 passes through the second bag filter 25 and is then discharged into the second exhaust gas passage 26. Here, with the opening operation of the second passage side branch damper 71a, the second filter side branch damper 71b, the second filter side return damper 72b, and the second passage side return damper 72a, the second branch passage 71 and the second return passage. Gas can be circulated between the second exhaust gas passage 26 and the first bag filter 15 via the passage 72. Accordingly, the suction force of the second fan 73 reaches the gas in the second exhaust gas passage 26 via the second return passage 72, the first bag filter 15 and the second branch passage 71, and the operation of the second fan 73 is performed. Accordingly, part of the high-temperature exhaust gas in the second exhaust gas passage 26 branches into the second branch passage 71 at the second branch portion 26b. The branched high-temperature exhaust gas flows through the first bag filter 15 from the upstream end toward the downstream end, and then passes through the second return passage 72 to the second return portion 26c of the second exhaust gas passage 26. Return. The exhaust gas that has passed through the first bag filter 15 joins with other exhaust gas that has been discharged from the second bag filter 25 and has not branched into the second branch passage 71, and the suction force of the second induction fan 28 causes the It is discharged from the second chimney 29.

  As described above, the inflow of gas from the first incinerator 13 and the first exhaust gas passage 16 into the first bag filter 15 is stopped. Therefore, the first bag filter 15 does not flow in the first incinerator 13 whose temperature has been reduced due to the stop and the low temperature gas in the first exhaust gas passage 16 communicating with the outside of the furnace, and the first bag filter 15 2 Only a part of the high-temperature exhaust gas discharged from the incinerator 23 flows.

  The gas flow when the first incinerator 15 is stopped and the one-system operation process is performed is indicated by a broken line in FIG.

  3 and 5, as the case where the first incinerator 15 is stopped and the one-system operation process is performed, the first passage side branch damper 61a, the first passage side return damper 62a, the first upstream side are shown. The case where the bypass damper 64a and the first downstream bypass damper 64b are closed is shown, but in this case, the open / close states of the dampers 61a, 62a, the damper 64a, and the damper 64b are not limited.

(2-2) When the second incinerator is stopped In this case, the second incinerator 23 and the second upstream main damper 24a and the second downstream main damper 26a are closed and stopped. Inflow of gas from the second exhaust gas passage 26 into the second bag filter 25 is prohibited. On the other hand, the first upstream main damper 14a and the first downstream main damper 16a are opened, and gas flows from the first incinerator 13 to the first bag filter 15 and from the first bag filter 15 to the first exhaust gas passage 16. Gas inflow.

  The first passage side branch damper 61a, the first filter side branch damper 61b, the first passage side return damper 62a, and the first filter side return damper 62b are opened, and the first branch passage 61 and the first return passage 62 are opened. This allows gas to flow between the first exhaust gas passage 16 and the second bag filter 25 via the. At this time, the first upstream bypass damper 64a and the first downstream bypass damper 64b are closed, and the gas is bypassed between the first branch passage 61 and the first return passage 62 via the first bypass passage 64. Do not do it.

  Further, the second filter side branch damper 71b and the second filter side return damper 72b are closed, and the inflow of gas from the first bag filter 15 to the second branch passage 71 and the second return passage 72 is prohibited.

  Then, the first fan 63 is operated to suck the gas in the first return passage 62 from the second bag filter 25 side to the first exhaust gas passage 16 side. Further, the first attracting fan 18 is operated. On the other hand, the second induction fan 28, the second fan 73, the first heater 65, and the second heater 75 are stopped. The rotation speed of the first fan 63 is changed according to the temperature in the second bag filter 25 detected by the temperature sensor, similarly to the case where the first incinerator 13 is stopped.

  By the above operation, the high-temperature exhaust gas discharged from the operating first incinerator 13 passes through the first bag filter 15 and is then discharged to the first exhaust gas passage 16. With the operation of the first fan 63, a part of the high-temperature exhaust gas in the first exhaust gas passage 16 branches into the first branch passage 61 at the first branch portion 16b. The branched high-temperature exhaust gas flows through the second bag filter 25 from the upstream end toward the downstream end, and then passes through the first return passage 62 to the first return portion 16c of the first exhaust gas passage 16. Return. The exhaust gas that has passed through the second bag filter 25 merges with other exhaust gas that has been discharged from the first bag filter 15 and has not branched to the first branch passage 61, and the suction force of the first induction fan 18 causes the It is discharged from the first chimney 19.

  As described above, the inflow of gas from the second incinerator 23 and the second exhaust gas passage 26 into the second bag filter 25 is stopped. Therefore, the second bag filter 25 does not flow in the second incinerator 23 whose temperature has been reduced due to the stop and the low temperature gas in the second exhaust gas passage 26 communicating with the outside of the furnace. Only a part of the high-temperature exhaust gas discharged from the incinerator 13 flows in.

  In FIG. 5, when the second incinerator 25 is stopped and the one-system operation process is performed, the second passage side branch damper 71a, the second passage side return damper 72a, and the second upstream side bypass damper 74a are used. Although the second downstream bypass damper 74b is closed, the dampers 71a, 72a, the damper 74a, and the damper 74b are not open or closed.

  As described above, during the one-system operation process, the high-temperature exhaust gas discharged from the incinerator that is operating in accordance with the execution of the exhaust gas shut-off process and the thermal energy supply process is the bug filter on the operation side and the bug on the stop side. Both bag filters are heated and kept warm by this high-temperature exhaust gas. Therefore, the energy consumption can be reduced compared with the case where a heater is used to keep the bag filter on the stop side warm.

  In the above method, the fan is operated to branch the high-temperature exhaust gas discharged from the operating-side incinerator to the stop-side bag filter, but the energy consumption of the fan is sufficient compared to the energy consumption of the heater. (For example, when a heater is used, the power consumption necessary for heat insulation is about several tens to several hundreds kW, that is, at least 10 kW or more, whereas the power consumption of the fan is several kW, ie, less than about 10 kW). In particular, in this method, only a part of the high-temperature exhaust gas discharged from the operating-side incinerator is branched to the stop-side bag filter, and the energy consumed by the fan is compared with the case where all the exhaust gas is branched. Can be kept small. Further, the rotational speed of the fan is changed according to the temperature in the bag filter on the stop side, so that the energy consumed by the fan can be suppressed while keeping the bag filter warm.

  The exhaust gas branched to the stop-side bag filter passes through the bag filter and then returns to the working-side exhaust gas passage. All exhaust gas discharged from the working-side incinerator passes through the working-side exhaust gas passage. Discharged outside the furnace. Therefore, it is not necessary to operate the stop-side induction fan in order to discharge the exhaust gas to the outside of the furnace, and the energy consumed by the induction fan can be kept small.

  Further, the gas flowing into the stop-side bag filter passes through the operation-side bug filter and is exhaust gas after dust is removed by the operation-side bag filter. Therefore, each bag filter can be kept warm while suppressing the clogging of the stop-side bag filter due to the dust or the like.

(3) Simultaneous stop process During the simultaneous stop period in which this simultaneous stop process is performed, gas is circulated between each of the bag filters 13 and 23 and each of the heaters 65 and 75 and heated by each of the heaters 65 and 75. Gas is introduced into the bag filters 13 and 23.

  Specifically, the first upstream main damper 14a, the first downstream main damper 16a, the second upstream main damper 24a, and the second downstream main damper 26a are closed, and each bug is removed from each incinerator 13 and 23. The inflow of gas to the filters 15 and 25 and the inflow of gas from the exhaust gas passages 16 and 26 to the bag filters 15 and 25 are prohibited.

  Further, the first passage side branch damper 61a, the first passage side return damper 62a, the second passage side branch damper 71a, and the second passage side return damper 72a are closed, and the first exhaust gas passage 16, the first branch passage 61, and The flow of gas between the first return passage 62 and the flow of gas between the second exhaust gas passage 26 and the second branch passage 71 and the second return passage 72 are prohibited. On the other hand, the first filter side branch damper 61b, the first filter side return damper 62b, the second filter side branch damper 71b, and the second filter side return damper 72b are opened, and the second bag filter 25 and the first branch passage 61 are opened. And the gas flow between the first return passage 62 and the gas between the first bag filter 15, the second branch passage 71 and the second return passage 72.

  Further, the first upstream bypass damper 64a, the first downstream bypass damper 64b, the second upstream bypass damper 74a, and the second downstream bypass damper 74b are opened, and the first bypass passage 64 and the first branch passage 61 are opened. A gas flow between the first return passage 62 and a gas flow between the second bypass passage 74, the second branch passage 71, and the second return passage 72 is enabled.

  Then, the first fan 63 and the second fan 73 are operated, and the first heater 65 and the second heater 75 are operated. The rotational speeds of the first fan 63 and the second fan 73 are changed in accordance with the temperatures in the first bag filter 15 and the second bag filter 25 as in the one-system operation process. Further, the first attracting fan 18 and the second attracting fan 28 are stopped.

  Here, the operation of each damper, the operation or stop of each fan, and the operation of each heater are started after both incinerators are stopped and the temperature in each bag filter is lowered below the reference temperature.

  With the above operation, the gas circulates between the second bag filter 25 and the first heater 65 through the first return passage 62, the first bypass passage 64, and the first branch passage 61. That is, the gas in the second bag filter 25 flows into the first return passage 62 by the suction force of the first fan 63, is heated by the first heater 65 through the first bypass passage 64, and then the first branch passage. Return to the second bug filter 25 through 61. Further, gas circulates between the first bag filter 15 and the second heater 75 through the second return passage 72, the second bypass passage 74, and the second branch passage 71. That is, the gas in the first bag filter 15 flows into the second return passage 72 by the suction force of the second fan 73, passes through the second bypass passage 74 and is heated by the second heater 75, and then the second branch passage. The process returns to the first bug filter 15 through 71. In this manner, in the simultaneous stop process, the gas heated by the heaters 65 and 75 flows into the bag filters 15 and 25, whereby the bag filters 15 and 25 are maintained at a high temperature. The gas flow in this simultaneous stop process is indicated by a broken line in FIG.

  Here, the gas circulating through the bag filters 15 and 25 and the heaters 65 and 75 may be exhaust gas remaining in the bag filters 15 and 25, or the air introduced from outside the furnace. Also good. When the atmosphere is introduced, for example, any one of the first branch passage 61, the first return passage 62, and the first bypass passage 64, the second branch passage 71, the second return passage 72, and the first passage. 2 An introduction port for introducing air into any of the bypass passages 74 and a damper for opening and closing the introduction port are provided, and these dampers are installed when the first fan 63 and the second fan 63 are started. It is only necessary to open it, introduce air into the passage, and close these dampers after a predetermined time. When air is used, the moisture of the gas flowing into each bag filter 15, 25 is suppressed to a lower level than when the exhaust gas remaining in each bag filter 15, 25 is used. It is possible to more reliably suppress the adhesion of dust to the surface.

  As described above, in the present waste treatment facility 1, the bag filters 15 and 25 are appropriately kept warm in the simultaneous operation process, the single system operation process, and the simultaneous stop process, Clogging can be suppressed. In particular, in the one-system operation process, high-temperature gas discharged from the operating incinerator is passed through the operation-side bag filter and then flows into the stop-side bag filter. These bag filters can be kept warm while keeping the temperature small.

  Here, although the said embodiment demonstrated the case where two incinerator systems were provided, three or more incinerator systems may be provided. In this case, a device having a branch passage and a return passage communicating the bag filter of each incinerator system and the exhaust gas passage of each incinerator system is used as the heat retaining device. For example, when a third incinerator system is provided in addition to the first incinerator system and the second incinerator system, the bag filter of the first incinerator system, the second incinerator system, and the third incinerator system The second incinerator system bag filter and the first incinerator system and the third incinerator system exhaust gas path are respectively connected to the third incinerator system bag filter and the first incinerator system bag filter. The exhaust gas passages of the incinerator system and the second incinerator system are connected. Then, after the hot gas discharged from the incinerator that is in operation flows into the bag filter of the incinerator system where the incinerator is stopped through the branch passage, the exhaust gas passage of the original incinerator system through the return passage Return to. In addition, high temperature gas discharged from a plurality of operating incinerators may flow into the bag filter of the incinerator system on the stop side, or high temperature gas discharged from one of these incinerators. Only inflow may be allowed.

  Next, the waste treatment facility 101 and the bag filter heat retaining method according to the second embodiment of the present invention will be described. FIG. 7 shows an enlarged view of the configuration of the waste treatment facility 101 near the heat retaining device 160. In the second embodiment, the structure of the heat retaining device for retaining the temperature of each bag filter is different from that in the first embodiment, and the operation procedure of the heat retaining device is different from that in the first embodiment. Here, only the heat retaining device 160 of the waste treatment facility 101 according to the second embodiment and the operation procedure of the heat retaining device 160 will be described.

  The heat retaining device 160 according to the second embodiment includes a first upstream main damper 14a, a first downstream main damper 16a, and a first downstream main damper 16a having the same configuration and function as the heat retaining device 60 according to the first embodiment. 2 has an upstream main damper 24a and a second downstream main damper 26a.

  The heat retaining device 160 includes a heat exchanger 180, a first inflow passage (first inflow portion) 181, a first outflow passage (first outflow portion) 182, and a second inflow passage (second inflow portion). 183 and a second outflow passage (second outflow portion) 184. The heat retaining device 160 includes a first branch passage 161, a first return passage 162, a first heat retaining gas inflow passage 166, a first heat retaining gas outflow passage 167, and a first fan (first suction means) 163. And a first heater (heating means) 165. The heat retaining device 160 includes a second branch passage 171, a second return passage 172, a second heat retaining gas inflow passage 176, a second heat retaining gas outflow passage 177, and a second fan (second suction means) 173. And a second heater (heating means) 175.

  Further, the heat retaining device 160 includes a first branch damper (first branch passage opening / closing means) 161a, a first return damper (first branch passage opening / closing means) 162a, and a first damper as dampers for opening and closing each passage. Thermal insulation gas inflow damper (first insulation gas passage opening / closing means) 166a, first insulation gas outflow damper (first insulation gas passage opening / closing means) 167a, second branch damper (second branch passage opening / closing means) 171a, 2 return damper (second branch passage opening / closing means) 172a, second heat insulation gas inflow damper (second heat insulation gas passage opening / closing means) 176a, and second heat insulation gas outflow damper (second heat insulation gas passage opening / closing means) 177a. Have.

  The heat exchanger 180 is an indirect heat exchanger that exchanges heat between gases in a non-contact state. As this heat exchanger, a general heat exchanger such as an ordinary plate heat exchanger may be used, and an indirect heat exchanger that exchanges heat between gases in a non-contact state through a medium is used. May be. Examples of the medium include oil and a heat storage material.

  The first inflow passage 181 is a passage for allowing gas to flow into the heat exchanger 180 from the first incinerator system 10 side. The first outflow passage 182 is a passage for returning the gas that has flowed into the heat exchanger 180 from the first inflow passage 181 to the first incinerator system 10 side. The first inflow passage 181 and the first outflow passage 182 extend from the heat exchanger 180 to the first incinerator system 10 side.

  The first branch passage 161 is a passage that communicates the first branch portion 16 b of the first exhaust gas passage 16 and the first inflow passage 181. The first heat retaining gas outflow passage 167 is a passage that connects the first bag filter 15 and the first inflow passage 181. That is, the first inflow passage 181 is branched into the first branch passage 161 and the first heat retaining gas outflow passage 167 on the side opposite to the connection portion with the heat exchanger 180.

  The first return passage 162 is a passage that communicates the first return portion 16 c of the first exhaust gas passage 16 and the first outflow passage 182. The first heat retaining gas inflow passage 166 is a passage that communicates the first bag filter 15 with the first outflow passage 182. That is, the first outflow passage 182 branches into the first return passage 162 and the first heat retaining gas inflow passage 166 on the side opposite to the connection portion with the heat exchanger 180.

  The first heat insulation gas inflow passage 166 and the first heat insulation gas outflow passage 167 are configured such that the gas flowing into the first bag filter 15 from the first heat insulation gas inflow passage 166 passes through almost the entire inside of the first bag filter 15. After that, it is connected to the first bag filter 15 at a position separated from each other so as to be discharged from the first heat retaining gas outflow passage 167. In the present embodiment, the first heat retaining gas inflow passage 166 is connected to a portion near the upstream end of the first bag filter 15 and different from the connection portion of the first upstream exhaust gas passage 14. The first heat retaining gas outflow passage 167 is connected to a portion near the downstream end of the first bag filter 15 and different from the connection portion of the first exhaust gas passage 16.

  The first branch damper 161a is provided in the first branch passage 161, and opens and closes the first branch passage 161. The first return damper 162a is provided in the first return passage 162 and opens and closes the first return passage 162. The first heat insulation gas inflow damper 166a is provided in the first heat insulation gas inflow passage 166, and opens and closes the first heat insulation gas inflow passage 166. The first heat insulation gas outflow passage 167a is provided in the first heat insulation gas outflow passage 167, and opens and closes the first heat insulation gas outflow passage 167.

  The first fan 163 is for sucking gas from the first inflow passage 181 to the first outflow passage 182 via the heat exchanger 180. In the present embodiment, the first fan 163 is provided in the first outflow passage 182.

  The first heater 165 is disposed in the first heat retaining gas inflow passage 166 and heats gas passing through the first heat retaining gas inflow passage 166.

  The second inflow passage 183 is a passage for allowing gas to flow into the heat exchanger 180 from the second incinerator system 20 side. The second outflow passage 184 is a passage for returning the gas flowing into the heat exchanger 180 from the second inflow passage 183 to the second incinerator system 20 side. The second inflow passage 183 and the second outflow passage 184 extend from the heat exchanger 180 to the second incinerator system 20 side.

  The second branch passage 171 is a passage that communicates the second branch portion 26 b of the second exhaust gas passage 26 and the second inflow passage 183. The second heat retaining gas outflow passage 177 is a passage that communicates the second bag filter 25 and the second inflow passage 183. That is, the second inflow passage 183 is branched into the second branch passage 171 and the second heat retaining gas outflow passage 177 on the side opposite to the connection portion with the heat exchanger 180.

  The second return passage 172 is a passage that communicates the second return portion 26 c of the second exhaust gas passage 26 and the second outflow passage 184. The second heat retaining gas inflow passage 176 is a passage that communicates the second bag filter 25 and the second outflow passage 184. That is, the second outflow passage 184 branches into the second return passage 172 and the second heat retaining gas inflow passage 176 on the side opposite to the connection portion with the heat exchanger 180.

  The second heat insulation gas inflow passage 176 and the second heat insulation gas outflow passage 177 are configured such that the gas flowing into the second bag filter 25 from the second heat insulation gas inflow passage 176 passes through almost the entire inside of the second bag filter 25. After that, it is connected to the second bag filter 25 at positions separated from each other so as to be discharged from the second heat retaining gas outflow passage 177. In the present embodiment, the second heat retaining gas inflow passage 176 is connected to a portion near the upstream end of the second bag filter 25 and different from the connection portion of the second upstream exhaust gas passage 24. The second heat retaining gas outflow passage 177 is connected to a portion near the downstream end of the second bag filter 25 and different from the connection portion of the second exhaust gas passage 26.

  The second branch damper 171a is provided in the second branch passage 171 and opens and closes the second branch passage 171. The second return damper 172a is provided in the second return passage 172, and opens and closes the second return passage 172. The second heat insulation gas inflow damper 176a is provided in the second heat insulation gas inflow passage 176, and opens and closes the second heat insulation gas inflow passage 176. The second heat insulation gas outflow passage 177 is provided in the second heat insulation gas outflow passage 177, and opens and closes the second heat insulation gas outflow passage 177.

  The second fan 173 is for sucking gas from the second inflow passage 183 to the second outflow passage 184 through the heat exchanger 180. In the present embodiment, the second fan 173 is provided in the second outflow passage 184.

  The second heater 175 is disposed in the second heat insulation gas inflow passage 176 and heats the gas passing through the second heat insulation gas inflow passage 176.

  The operation procedure of the heat retaining device 160 configured as described above will be described with reference to FIGS. FIG. 10 shows the operation state of each damper in the simultaneous operation process or the like. In FIG. 10, a circle indicates that the damper is opened, and a cross indicates that the damper is closed. FIG. 11 shows the operating state of each fan and the operating state of each heater in the simultaneous operation process or the like. Here, it is assumed that the heat retaining device 160 is operated by an operator.

(1) Simultaneous operation process In this simultaneous operation process, the high-temperature gas discharged | emitted from each said incinerator 13 and 23 is independently made to flow into each bag filter 15 and 25 similarly to the said 1st Embodiment. At the same time, it is discharged out of the furnace independently through the exhaust gas passages 16 and 26.

  Specifically, the first upstream main damper 14a, the first downstream main damper 16a, the second upstream main damper 24a, and the second downstream main damper 26a are opened, and each bag filter is opened from each incinerator 13 and 23. Inflow of gas into the 15, 16 and inflow of gas from the bag filters 15, 16 into the exhaust gas passages 16, 17 are enabled.

  On the other hand, the branch dampers 161a and 171a, the return dampers 162a and 172a, the heat insulation gas inflow dampers 166a and 176a, the heat insulation gas outflow dampers 167a and 177a are closed, and the exhaust gas passages 16 and 26 and the bug filters 15, The flow of gas between 25 and the heat exchanger 180 is prohibited.

  Then, the first attracting fan 18 and the second attracting fan 28 are operated. Here, in the simultaneous operation process, the first fan 163 and the second fan 173 and the first heater 165 and the second heater 175 are stopped.

  By the above operation, the high temperature exhaust gas discharged from the first incinerator 13 flows into the first bag filter 15, and then the first heat retaining gas inflow passage 166, the first heat retaining gas outflow passage 167, the first branch passage 161, Without flowing into the heat exchanger 180 through the first return passage 162, the first exhaust passage 16 is discharged from the first chimney 19 to the outside of the furnace. Similarly, after the high temperature exhaust gas discharged from the second incinerator 23 flows into the second bag filter 25, the second heat retaining gas inflow passage 176, the second heat retaining gas outflow passage 177, the second branch passage 171, The second exhaust passage 26 is discharged from the second chimney 29 to the outside of the furnace without flowing into the heat exchanger 180 via the two return passages 172. The flow of exhaust gas in this simultaneous operation process is indicated by a broken line in FIG.

  Thus, also in 2nd Embodiment, in the said simultaneous operation process, the high temperature gas discharged | emitted from each incinerator 13 and 23 flows in into each bag filter 15 and 25 independently, and each exhaust gas passage 16, It is discharged | emitted out of the furnace independently via 26, The said high temperature gas can be discharged | emitted efficiently, maintaining each bag filter 15 and 25 at high temperature. In addition, the inflow of exhaust gas to the first fan 163 and the second fan 173 provided in the first outflow passage 182 and the second outflow passage 184 is avoided, and these fans are brought to an early stage due to the adhesion of ash in the exhaust gas. It is suppressed from being damaged.

(2) Single-system operation process In this single-system operation process, as in the first embodiment, the inflow of gas from the stopped incinerator and the exhaust gas passage to the stop-side bag filter is stopped (exhaust gas cutoff). Process). On the other hand, in the second embodiment, unlike the first embodiment, a part of the high-temperature exhaust gas discharged from the operating incinerator and passing through the operation-side bag filter is transferred to the heat exchanger 180. And the gas is circulated between the stop-side bag filter and the heat exchanger 180 to supply only the thermal energy of the high-temperature exhaust gas into the stop-side bag filter. Then, the high-temperature exhaust gas flowing into the heat exchanger 180 is returned to the exhaust gas passage on the operation side and discharged from the operation side chimney to the outside of the furnace together with other exhaust gases discharged from the operation side bag filter (thermal energy supply step). ).

  Also in the second embodiment, the exhaust gas cutoff step and the thermal energy supply step are started after one incinerator is stopped and then the temperature in the stop-side bag filter is lowered below the reference temperature.

  Next, a specific operation procedure of the heat retaining device 160 in the exhaust gas shut-off process and the thermal energy supply process is (2-1) when the first incinerator 13 is stopped and only the second incinerator 23 is operating. And (2-2) the case where the second incinerator 23 is stopped and only the first incinerator 13 is operating.

(2-1) When the first incinerator is stopped In this case, the first incinerator 13 and the first upstream main damper 14a and the first downstream main damper 16a are closed and stopped. Inflow of gas from the first exhaust gas passage 16 into the first bag filter 15 is prohibited. On the other hand, the second upstream main damper 24a and the second downstream main damper 26a are opened, gas flows from the second incinerator 23 to the second bag filter 25, and from the second bag filter 25 to the second exhaust gas passage 26. Gas inflow.

  Further, the second branch damper 171a and the second return damper 172a are opened, and the inflow of gas from the second exhaust gas passage 26 to the heat exchanger 180 via the second branch passage 171 and the second inflow passage 183, 2 allows gas to flow from the heat exchanger 180 to the second exhaust gas passage 26 via the second outflow passage 184 and the second return passage 172. On the other hand, the second heat insulation gas inflow damper 176a and the second heat insulation gas outflow damper 177a are closed, and the gas flow between the second bag filter 25 and the heat exchanger 180 is prohibited.

  Further, the first heat insulation gas inflow damper 166a and the first heat insulation gas outflow damper 167a are opened, and the first bag filter 15 to the heat exchanger 180 through the first heat insulation gas outflow passage 167 and the first inflow passage 181. And the outflow of gas from the heat exchanger 180 to the first bag filter 15 through the first outflow passage 182 and the first heat retaining gas inflow passage 166. On the other hand, the first branch damper 161a and the first return damper 162a are closed, and the flow of gas between the first exhaust gas passage 16 and the heat exchanger 180 is prohibited.

  Then, the first fan 163 is operated to suck the gas in the first inflow passage 181 through the heat exchanger 180 to the first outflow passage 182 side, and the second fan 173 is operated to 2 Gas in the inflow passage 183 is sucked to the second outflow passage 184 side through the heat exchanger 180. The rotational speed of the second fan 173 is changed according to the temperature in the first bag filter 15 detected by the temperature sensor. Specifically, the operator increases the rotation speed of the second fan 173 when the detected value of the temperature sensor is lower than the heat retention temperature, and the second fan 173 when the detected value is equal to or higher than the heat retention temperature. Reduce the number of revolutions.

  Instead of increasing or decreasing the rotational speed of the second fan 173, the rotational speed of the first fan 163 may be increased or decreased based on the detection value of the temperature sensor, or the first fan 163 and the second fan 163 You may make it maintain the temperature in the bag filter (1st bag filter 15 in the said Example) used as heat retention by maintaining the said heat retention temperature by raising or decreasing each rotation speed of the fan 173.

  Then, while the second induction fan 28 is operated, the first induction fan 18, the first heater 165, and the second heater 175 are stopped.

  Through the above operation, the high-temperature exhaust gas discharged from the operating second incinerator 23 passes through the second bag filter 25 and is then discharged into the second exhaust gas passage 26. Here, as the second branch damper 171a and the second return damper 172a are opened, the second exhaust gas passes through the second branch passage 171, the second inflow passage 183, the second outflow passage 184, and the second return passage 172. Gas can be circulated between the passage 26 and the heat exchanger 180. Accordingly, with the operation of the second fan 173, part of the high-temperature exhaust gas in the second exhaust gas passage 26 branches into the second branch passage 171 at the second branch portion 26b. The branched high-temperature exhaust gas passes through the heat exchanger 180 and then returns to the second return portion 26 c of the second exhaust gas passage 26 through the second return passage 172. The exhaust gas that has passed through the heat exchanger 180 joins with other exhaust gas that has been discharged from the second bag filter 25 and has not branched to the second branch passage 171, and the second induction fan 28 draws the first exhaust gas. 2 discharged from the chimney 29.

  On the other hand, with the opening operation of the first heat insulation gas inflow damper 166a and the first heat insulation gas outflow damper 167a, the first heat insulation gas outflow passage 167, the first inflow passage 181, the first outflow passage 182 and the first heat insulation gas inflow passage. The gas can be circulated between the first bag filter 15 and the heat exchanger 180 via the 166. Further, the inflow of gas from the first incinerator 13 and the first exhaust gas passage 16 into the first bag filter 15 is stopped. Accordingly, with the operation of the first fan 163, the gas in the first bag filter 15 flows into the heat exchanger 180 through the first heat insulation gas outflow passage 167, passes through the heat exchanger 180, and then passes through the first heat insulation gas 180. The gas returns to the first bag filter 15 through the gas inflow passage 166.

  In this way, the gas circulating between the heat exchanger 180 and the first bag filter 15 and a part of the high-temperature exhaust gas that has passed through the second bag filter 25 flow into the heat exchanger 180. As a result of heat exchange between these gases in the heat exchanger 180, the gas heated by the high-temperature exhaust gas flows into the first bag filter 15.

  The flow of gas when the first incinerator 15 is stopped and the one-system operation process is performed is shown by a broken line in FIG.

(2-2) When the second incinerator is stopped In this case, the second incinerator 23 and the second upstream main damper 24a and the second downstream main damper 26a are closed and stopped. Inflow of gas from the second exhaust gas passage 26 into the second bag filter 25 is prohibited. On the other hand, the first upstream main damper 14a and the first downstream main damper 16a are opened, and gas flows from the first incinerator 13 to the first bag filter 15 and from the first bag filter 15 to the first exhaust gas passage 16. Gas inflow.

  Further, the first branch damper 161a and the first return damper 162a are opened, and the inflow of gas from the first exhaust gas passage 16 to the heat exchanger 180 via the first branch passage 161 and the first inflow passage 181, The outflow of the gas from the heat exchanger 180 to the first exhaust gas passage 16 through the first outflow passage 182 and the first return passage 162 is enabled. On the other hand, the first heat insulation gas inflow damper 166a and the first heat insulation gas outflow damper 167a are closed, and the gas flow between the first bag filter 15 and the heat exchanger 180 is prohibited.

  Further, the second heat insulation gas inflow damper 176a and the second heat insulation gas outflow damper 177a are opened, and the second bag filter 25 is passed through the second heat insulation gas outflow passage 177 and the second inflow passage 183 to the heat exchanger 180. And the outflow of gas from the heat exchanger 180 to the second bag filter 25 through the second outflow passage 184 and the second heat retaining gas inflow passage 176. On the other hand, the second branch damper 171a and the second return damper 172a are closed, and the flow of gas between the second exhaust gas passage 26 and the heat exchanger 180 is prohibited.

  Then, the second fan 173 is operated to suck the gas in the second inflow passage 183 through the heat exchanger 180 to the second outflow passage 184 side, and the first fan 163 is operated to The gas in the 1 inflow passage 181 passes through the heat exchanger 180 and is sucked into the first outflow passage 182 side. The rotational speed of the first fan 163 is changed according to the temperature in the second bag filter 25 detected by the temperature sensor, as in the case where the first incinerator 13 is stopped.

  Then, while the first induction fan 18 is operated, the second induction fan 28, the first heater 65, and the second heater 75 are stopped.

  By the above operation, the high-temperature exhaust gas discharged from the operating first incinerator 13 passes through the first bag filter 15 and is then discharged to the first exhaust gas passage 16. Here, with the opening operation of the first branch damper 161a and the first return damper 162a, the first exhaust gas through the first branch passage 161, the first inflow passage 181, the first outflow passage 182 and the first return passage 162. Gas can be circulated between the passage 16 and the heat exchanger 180. Accordingly, with the operation of the first fan 163, part of the high-temperature exhaust gas in the first exhaust gas passage 16 branches into the first branch passage 161 at the first branch portion 16b. The branched high-temperature exhaust gas passes through the heat exchanger 180 and then returns to the first return portion 16 c of the first exhaust gas passage 16 through the first return passage 162. The exhaust gas that has passed through the heat exchanger 180 merges with other exhaust gas that has been discharged from the first bag filter 15 and has not branched to the first branch passage 161, and the first induction fan 18 draws the first exhaust gas through the suction force. It is discharged from one chimney 19.

  On the other hand, with the opening operation of the second heat insulation gas inflow damper 176a and the second heat insulation gas outflow damper 177a, the second heat insulation gas outflow passage 177, the second inflow passage 183, the second outflow passage 184, the second heat insulation gas inflow passage. The gas can be circulated between the second bag filter 25 and the heat exchanger 180 via 176. Further, the inflow of gas from the second incinerator 23 and the second exhaust gas passage 26 into the second bag filter 25 is stopped. Accordingly, as the second fan 173 is operated, the gas in the second bag filter 25 flows into the heat exchanger 180 through the second heat insulating gas outflow passage 177, passes through the heat exchanger 180, and then passes through the second heat insulating gas. It returns to the second bag filter 25 through the gas inflow passage 176.

  In this way, the gas circulating between the heat exchanger 180 and the second bag filter 25 and a part of the high-temperature exhaust gas that has passed through the first bag filter 15 flow into the heat exchanger 180. As a result of heat exchange between these gases in the heat exchanger 180, the gas heated by the high-temperature exhaust gas flows into the second bag filter 25.

  As described above, during the one-system operation process, the gas circulating between the stop-side bag filter and the heat exchanger 180 is generated in the heat exchanger 180 as the exhaust gas blocking process and the thermal energy supply process are performed. The high temperature exhaust gas discharged from the operating incinerator and passing through the operation side bag filter is heated, and both bag filters are heated and kept warm by this high temperature exhaust gas. Therefore, the energy consumption can be reduced compared with the case where a heater is used to keep the bag filter on the stop side warm. Further, the exhaust gas discharged from the operating incinerator and branched to the heat exchanger 180 is returned to the operating side exhaust gas passage, and all the exhaust gas discharged from the operating side incinerator is exhausted to the operating side exhaust gas passage. It is discharged out of the furnace. Therefore, it is not necessary to operate the stop-side induction fan in order to discharge the exhaust gas to the outside of the furnace, and the energy consumed by the induction fan can be kept small.

  In particular, in the second embodiment, the high temperature exhaust gas discharged from the operating incinerator is not directly flowed into the bag filter on the stop side, but the indirect heat exchanger 180 is used for the high temperature exhaust gas. Compared with the case where only the thermal energy of the exhaust gas is supplied to the stop-side bag filter and the high-temperature exhaust gas is directly flowed into the stop-side bag filter, the inflow of acid gas into the stop-side bag filter is reduced. It can suppress more reliably.

  Further, since the gas flowing into the heat exchanger 180 is exhaust gas after passing through the bag filter on the operating side and dust is removed in the bag filter, the heat exchanger 180 is clogged with the dust or the like. Each bag filter can be kept warm while suppressing the above.

  Here, the gas circulating between the bag filters 15 and 25 and the heat exchanger 180 through the heat insulation gas outflow passages 167 and 177 and the heat insulation gas inflow passages 166 and 176 passes through the bag filters 15 and 25. It may be exhaust gas remaining in the atmosphere, or air introduced from outside the furnace. In the case of introducing the atmosphere, for example, an introduction port for introducing the atmosphere is provided in each of the heat retaining gas inflow passages 166, 176 or each of the heat insulation gas outflow passages 167, 177, and a damper for opening and closing the introduction port is provided, These dampers may be opened at the start of the first fan 163 and the second fan 173 to introduce the atmosphere into the passage and be closed after a predetermined time. When the atmosphere is used, the moisture of the gas flowing into each bag filter 15, 25 is suppressed to a lower level than when the exhaust gas remaining in each bag filter 15, 25 is used. , 25 can more reliably suppress adhesion of dust.

(3) Simultaneous stop step In this simultaneous stop step, gas is circulated between the bag filters 13 and 23 and the heaters 165 and 175 in the same manner as in the first embodiment. The heated gas is caused to flow into the bag filters 13 and 23.

  Specifically, the first branch damper 161a, the first return damper 162a, the second branch damper 171a, and the second return damper 172a are closed, and the gas between the exhaust gas passages 16 and 26 and the heat exchanger 180 is closed. Prohibit distribution. Meanwhile, the first heat insulation gas inflow damper 166a, the first heat insulation gas outflow damper 167a, the second heat insulation gas inflow damper 176a, and the second heat insulation gas outflow damper 177a are opened, and the bag filters 15 and 25 and the heat exchangers 180 are opened. Gas circulation between the two.

  Then, the first fan 163 and the second fan 173 are operated, and the first heater 165 and the second heater 175 are operated. Further, the first attracting fan 18 and the second attracting fan 28 are stopped.

  Here, the operation of each damper, the operation or stop of each fan, and the operation of each heater are started after both incinerators are stopped and the temperature in each bag filter is lowered below the reference temperature.

  By the above operation, the gas in the first bag filter 15 flows into the heat exchanger 180 through the first heat retaining gas outflow passage 167 and the first inflow passage 181, and after passing through the heat exchanger 180, It returns to the 1st bag filter 15 through the 1st heat retention gas inflow passage 166 provided with 1 heater 165. That is, gas circulates between the first bag filter 15 and the first heater 165, and the gas heated by the first heater 165 flows into the first bag filter 15. The gas in the second bag filter 25 flows into the heat exchanger 180 through the second heat retaining gas outflow passage 177 and the second inflow passage 183, and after passing through the heat exchanger 180, the second heater 175. It returns to the 2nd bag filter 25 through the 2nd heat retention gas inflow passage 176 provided. That is, the gas circulates between the second bag filter 25 and the second heater 175, and the gas heated by the second heater 165 flows into the second bag filter 25.

  In this way, in the simultaneous stop process, the gas heated by the heaters 165 and 175 flows into the bag filters 15 and 25, whereby the bag filters 15 and 25 are kept warm.

  Here, the gas circulating between each bag filter 15, 25 and each heater 165, 175, ie, each bag filter 15, 25, and the heat exchanger 180 remains in each bag filter 15, 25 as described above. It may be exhaust gas that is being discharged, or it may be air introduced from outside the furnace.

  As described above, also in the waste treatment facility 101 according to the second embodiment, the bug filters 15 and 25 are appropriately kept warm in the simultaneous operation process, the single system operation process, and the simultaneous stop process, so that these bugs can be maintained. Low temperature corrosion and clogging of the filters 15 and 25 can be suppressed. In particular, since the exhaust gas discharged from the active bag filter does not flow directly into the stop-side bug filter, only the heat energy of this exhaust gas flows into the stop-side bug filter. However, it is possible to suppress the dust contained in the exhaust gas from flowing into the stop-side bag filter and clogging the bag filter.

  Here, although the said embodiment demonstrated the case where two incinerator systems were provided, three or more incinerator systems may be provided. In this case, a heat exchanger is provided between each incinerator system and another incinerator system, and the heat energy of the exhaust gas from the operating incinerator system is transferred to the stop side via the heat exchanger. What is necessary is just to supply to an incinerator system. Alternatively, by using one heat exchanger, the heat exchanger and each incinerator system are connected so that heat energy can be exchanged between the two incinerator systems via the heat exchanger. The thermal energy may be exchanged between these incinerator systems.

  In the first embodiment and the second embodiment, the first fans 63 and 163 and the second fans 73 and 173 are used as means for sucking the gas in each branch passage or the like. The means for sucking air is not limited to the fan.

DESCRIPTION OF SYMBOLS 1 Waste treatment equipment 10 1st incinerator system 13 1st incinerator 15 1st bag filter (1st dust collector)
16 1st exhaust gas passage 20 2nd incinerator system 23 2nd incinerator 25 2nd bag filter (2nd dust collector)
26 Second exhaust gas passage 60 Thermal insulation device 61 First branch passage 62 First return passage 63 First fan (first suction means)
65 First heating means (heating means)
71 Second branch passage 72 Second return passage 73 Second fan (second suction means)
75 Second heating means (heating means)
101 Waste treatment facility 160 Insulating device 161 First branch passage 162 First return passage 166 First heat insulation gas inflow passage 167 First heat insulation gas outflow passage 171 Second branch passage 172 Second return passage 176 Second heat insulation gas inflow passage 177 Second heat insulation gas outflow passage 180 Heat exchanger

Claims (14)

A first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and an exhaust gas that has passed through the first dust collector Dust is removed from a first incinerator system having a first exhaust gas passage for discharging outside, a second incinerator for thermally decomposing waste, and exhaust gas discharged from the second incinerator. And a second incinerator system having a second dust collecting device for the purpose and a second exhaust gas passage for discharging the exhaust gas that has passed through the second dust collecting device to the outside of the furnace. There,
During a specific simultaneous operation period, a simultaneous operation step of operating the first incinerator and the second incinerator at the same time, and during a single system operation period other than the simultaneous operation period, the first incinerator and the second incinerator Including one-side operation process of stopping one and operating the other,
In the simultaneous operation step, the exhaust gas discharged from the first incinerator is discharged outside the furnace through the first dust collector and the first exhaust gas passage, and the exhaust gas discharged from the second incinerator is discharged to the second dust collection. Discharged outside the furnace through the apparatus and the second exhaust gas passage,
In the one-system operation process, in the stop-side incinerator system, the exhaust gas that blocks the gas flow between the incinerator and the dust collector and the gas flow between the dust collector and the exhaust gas passage. A part of the exhaust gas in the exhaust gas passage of the operating side incinerator system is branched from a specific branch part of the exhaust gas passage on the operating side to the dust collector side of the incinerator system on the stop side. The thermal energy is supplied into the dust collector on the stop side, and the exhaust gas after the heat energy is supplied into the dust collector on the stop side is returned to the downstream side of the branch portion in the exhaust gas passage on the operation side. A method for operating a waste treatment facility, comprising performing a heat energy supply step for returning to the section. An incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and exhaust gas passing through the dust collector for discharging outside the furnace A method for operating a waste treatment facility having a plurality of incinerator systems each having an exhaust gas passage,
A simultaneous operation step of simultaneously operating the incinerators of all the incinerator systems during a specific simultaneous operation period;
A single system operation step of stopping an incinerator of a specific incinerator system and operating an incinerator of another incinerator system during a single system operation period other than the simultaneous operation period,
In the simultaneous operation step, exhaust gas discharged from each incinerator is discharged out of the furnace independently from each other through the dust collector and the exhaust gas passage for each incinerator system,
In the one-system operation process, in the stop-side incinerator system, the exhaust gas that blocks the gas flow between the incinerator and the dust collector and the gas flow between the dust collector and the exhaust gas passage. A part of the exhaust gas in the exhaust passage of the shut-off process and at least one incinerator system on the operating side is branched from a specific branch part of the exhaust passage on the operating side to the dust collector side of the incinerator system on the stop side While supplying the thermal energy of the exhaust gas into the dust collector on the stop side, the exhaust gas after supplying the thermal energy into the dust collector on the stop side is downstream of the branch portion in the exhaust gas passage on the operation side. And a heat energy supplying step for returning to the return portion on the side. In the operation method of the waste disposal facility according to claim 1 or 2,
During the simultaneous stop period other than the simultaneous operation period and the one-system operation period, including a simultaneous stop step of simultaneously stopping the incinerators of the respective incinerator systems,
In the simultaneous stopping step, the waste gas is circulated independently between the dust collector and the heating means for each incinerator system, and the circulating gas is heated by the heating means. Operation method of processing equipment. In the operation method of the waste disposal facility according to any one of claims 1 to 3,
The exhaust gas shut-off step and the thermal energy supply step are a reference temperature in which the temperature in the dust collector of the stop-side incinerator system is preset after the stop of the incinerator system of the stop-side incinerator system A method for operating a waste treatment facility, which starts after being reduced to the following. In the operation method of the waste treatment facility according to any one of claims 1 to 4,
In the thermal energy supplying step, after the exhaust gas branched at the branching portion to the dust collector side of the stop-side incinerator system passes through the stop-side dust collector, the operation-side incinerator system A method for operating a waste treatment facility, characterized in that the waste treatment facility is returned to the return section. The operation method of the waste treatment facility according to claim 5,
The thermal energy supply step branches to the dust collector side of the stop-side incinerator system at the branch portion of the operation-side incinerator system according to the temperature in the dust collector of the stop-side incinerator system A method for operating a waste treatment facility comprising a step of adjusting an amount of exhaust gas to be discharged. In the operation method of the waste treatment facility according to any one of claims 1 to 4,
In the thermal energy supply step, gas is circulated between a dust collector and a heat exchanger of a stop-side incinerator system, and the operating-side incinerator system is branched at a branch portion of the operating-side incinerator system A part of the exhaust gas branched from the exhaust gas passage to the dust collector side of the stop-side incinerator system and then returned to the return part of the operation-side incinerator system, and the heat In the exchanger, the waste treatment is characterized in that heat exchange is performed in a non-contact state between the gas circulating between the dust collector on the stop side and the heat exchanger and the exhaust gas branched at the branch portion. How to operate the equipment. The operation method of the waste treatment facility according to claim 7,
In the thermal energy supply step, the stop side is connected to the stop side from the exhaust gas passage of the operating side incinerator system according to the temperature in the dust collector of the incinerator system on the stop side or the temperature of the heat exchanger. A method for operating a waste treatment facility comprising a step of adjusting an amount of exhaust gas to be branched to the dust collector side of the incinerator system of the present invention. A first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and an exhaust gas that has passed through the first dust collector Dust is removed from a first incinerator system having a first exhaust gas passage for discharging outside, a second incinerator for thermally decomposing waste, and exhaust gas discharged from the second incinerator. And a second incinerator system having a second dust collector for exhausting and a second exhaust gas passage for discharging the exhaust gas that has passed through the second dust collector to the outside of the furnace. When the one incinerator of the first incinerator and the second incinerator is stopped, a heat retaining device for retaining the dust collector of the incinerator system including the stopped incinerator,
A gas flow path between the first incinerator and the first dust collector and a gas flow path between the first dust collector and the first exhaust gas passage can be switched between a opened state and a closed state. 1 exhaust gas blocking means,
A gas flow path between the second incinerator and the second dust collector and a gas flow path between the second dust collector and the second exhaust gas passage can be switched between a opened state and a closed state. 2 exhaust gas blocking means;
A first branch passage that communicates the specific first branch portion of the first exhaust gas passage with the second dust collector;
A second branch passage communicating the specific second branch portion of the second exhaust gas passage with the first dust collector;
A first return passage communicating the first return portion downstream of the branch portion of the first exhaust gas passage and the second dust collector;
A second return passage communicating the second return portion downstream of the branch portion of the second exhaust gas passage and the first dust collector;
A part of the exhaust gas in the first exhaust gas passage is returned to the first exhaust gas passage through the first return passage after the exhaust gas flows into the second dust collector through the first branch passage. First suction means capable of sucking into one branch passage;
A part of the exhaust gas in the second exhaust gas passage is returned to the second exhaust gas passage through the second return passage after the exhaust gas flows into the first dust collector through the second branch passage. A second suction means capable of suctioning into the two branch passages;
First branch passage opening / closing means capable of switching between a state of opening and closing the first branch passage and the first return passage;
And a second branch passage opening / closing means capable of switching between a state where the second branch passage and the second return passage are opened and a state where the second return passage is closed. An incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and exhaust gas passing through the dust collector for discharging outside the furnace Incineration including waste incinerators provided in a waste treatment facility including a plurality of incinerator systems each having an exhaust gas passage and stopped when at least one incinerator of the plurality of incinerator systems is stopped A heat retaining device for retaining the dust collector of the furnace system,
A state in which each incinerator system is individually provided, and a gas flow path between the incinerator and the dust collector and a gas flow path between the dust collector and the exhaust gas passage are opened and closed. An exhaust gas blocking means that can be switched to,
A branch passage for communicating a specific branch portion of an exhaust gas passage of each incinerator system with a dust collector of another incinerator system;
A return passage communicating with a return portion downstream of the branch portion of the exhaust gas passage of each incinerator system and a dust collector of another incinerator system;
A part of the gas in the exhaust gas passage of each incinerator system is returned to the exhaust gas passage of each incinerator system through the return passage after the exhaust gas flows into the dust collector of another incinerator system through the branch passage. And suction means capable of sucking into the branch passages,
A heat retaining device, comprising: a branch passage opening / closing means capable of switching between a state where each branch passage and each return passage are opened and a state where each branch passage is closed. A first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and an exhaust gas that has passed through the first dust collector Dust is removed from a first incinerator system having a first exhaust gas passage for discharging outside, a second incinerator for thermally decomposing waste, and exhaust gas discharged from the second incinerator. And a second incinerator system having a second dust collector for exhausting and a second exhaust gas passage for discharging the exhaust gas that has passed through the second dust collector to the outside of the furnace. When the one incinerator of the first incinerator and the second incinerator is stopped, a heat retaining device for retaining the dust collector of the incinerator system including the stopped incinerator,
A heat exchanger for exchanging heat between the two fluids in a non-contact state;
A gas flow path between the first incinerator and the first dust collector and a gas flow path between the first dust collector and the first exhaust gas passage can be switched between a opened state and a closed state. 1 exhaust gas blocking means,
A gas flow path between the second incinerator and the second dust collector and a gas flow path between the second dust collector and the second exhaust gas passage can be switched between a opened state and a closed state. 2 exhaust gas blocking means;
A first inflow portion for allowing gas to flow into the heat exchanger from the first incinerator system side;
A second inflow portion for allowing gas to flow into the heat exchanger from the second incinerator system side;
A first outflow part for discharging the gas flowing into the heat exchanger from the first inflow part from the heat exchanger to the first incinerator system;
A second outflow part for discharging the gas flowing into the heat exchanger from the second inflow part to the second incinerator system side from the heat exchanger;
A first heat retaining gas outflow passage communicating the first inflow portion with the first dust collector;
A second heat retaining gas outflow passage communicating the second inflow portion with the second dust collector;
A first heat retaining gas inflow passage communicating the first outflow portion and the first dust collector;
A second heat retaining gas inflow passage communicating the second outflow portion and the second dust collector;
A first branch passage communicating the first inflow portion with a specific first branch portion of the first exhaust gas passage;
A second branch passage communicating the second inflow portion and a specific second branch portion of the second exhaust gas passage;
A first return passage communicating the first outlet and the first return portion downstream of the first branch portion of the first exhaust gas passage;
A second return passage communicating the second outflow portion and a second return portion downstream of the second branch portion of the second exhaust gas passage;
First suction means for sucking the gas in the first inflow part or the first outflow part so that the gas flows from the first inflow part to the first outflow part via the heat exchanger;
A second suction means for sucking the gas in the second inflow portion or the second outflow portion so that the gas flows from the second inflow portion to the second outflow portion via the heat exchanger;
First heat insulation gas passage opening / closing means capable of switching between a state of opening and closing the first heat insulation gas inflow passage and the first heat insulation gas outflow passage;
A second heat insulation gas passage opening / closing means capable of switching between a state in which the second heat insulation gas inflow passage and the second heat insulation gas outflow passage are opened and in a closed state;
First branch passage opening / closing means capable of switching between a state of opening and closing the first branch passage and the first return passage;
And a second branch passage opening / closing means capable of switching between a state where the second branch passage and the second return passage are opened and a state where the second return passage is closed. A first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and an exhaust gas that has passed through the first dust collector A first incinerator system having a first exhaust gas passage for discharging outside;
A second incinerator for thermally decomposing waste, a second dust collector for removing dust from the exhaust gas discharged from the second incinerator, and an exhaust gas passing through the second dust collector A second incinerator system having a second exhaust gas passage for discharging outside;
A heat retaining device for retaining heat of the first dust collecting device and the second dust collecting device;
The heat retaining device is
A gas flow path between the first incinerator and the first dust collector and a gas flow path between the first dust collector and the first exhaust gas passage can be switched between a opened state and a closed state. 1 exhaust gas blocking means,
A gas flow path between the second incinerator and the second dust collector and a gas flow path between the second dust collector and the second exhaust gas passage can be switched between a opened state and a closed state. 2 exhaust gas blocking means;
A first branch passage that communicates the specific first branch portion of the first exhaust gas passage with the second dust collector;
A second branch passage communicating the specific second branch portion of the second exhaust gas passage with the first dust collector;
A first return passage communicating the first return portion downstream of the branch portion of the first exhaust gas passage and the second dust collector;
A second return passage communicating the second return portion downstream of the branch portion of the second exhaust gas passage and the first dust collector;
A part of the exhaust gas in the first exhaust gas passage is returned to the first exhaust gas passage through the first return passage after the exhaust gas flows into the second dust collector through the first branch passage. First suction means capable of sucking into one branch passage;
A part of the exhaust gas in the second exhaust gas passage is returned to the second exhaust gas passage through the second return passage after the exhaust gas flows into the first dust collector through the second branch passage. A second suction means capable of suctioning into the two branch passages;
First branch passage opening / closing means capable of switching between a state of opening and closing the first branch passage and the first return passage;
A waste treatment facility comprising: a second branch passage opening / closing means capable of switching between a state where the second branch passage and the second return passage are opened and a state where the second return passage is closed. An incinerator for thermally decomposing waste, a dust collector for removing dust from the exhaust gas discharged from the incinerator, and exhaust gas passing through the dust collector for discharging outside the furnace A plurality of incinerator systems each having an exhaust gas passage;
A heat retaining device for retaining the dust collector of the incinerator system including the incinerator stopped when at least one incinerator of the plurality of incinerator systems is stopped,
The heat retaining device is
A state in which each incinerator system is individually provided, and a gas flow path between the incinerator and the dust collector and a gas flow path between the dust collector and the exhaust gas passage are opened and closed. An exhaust gas blocking means that can be switched to,
A branch passage for communicating a specific branch portion of an exhaust gas passage of each incinerator system with a dust collector of another incinerator system;
A return passage communicating with a return portion downstream of the branch portion of the exhaust gas passage of each incinerator system and a dust collector of another incinerator system;
A part of the gas in the exhaust gas passage of each incinerator system is returned to the exhaust gas passage of each incinerator system through the return passage after the exhaust gas flows into the dust collector of another incinerator system through the branch passage. And suction means capable of sucking into the branch passages,
A waste treatment facility comprising: a branch passage opening / closing means capable of switching between a state where each branch passage and each return passage are opened and closed. A first incinerator for thermally decomposing waste, a first dust collector for removing dust from the exhaust gas discharged from the first incinerator, and an exhaust gas that has passed through the first dust collector A first incinerator system having a first exhaust gas passage for discharging outside;
A second incinerator for thermally decomposing waste, a second dust collector for removing dust from the exhaust gas discharged from the second incinerator, and an exhaust gas passing through the second dust collector A second incinerator system having a second exhaust gas passage for discharging outside;
A heat retaining device for retaining heat of the first dust collecting device and the second dust collecting device;
The heat retaining device is
A heat exchanger for exchanging heat between the two fluids in a non-contact state;
A gas flow path between the first incinerator and the first dust collector and a gas flow path between the first dust collector and the first exhaust gas passage can be switched between a opened state and a closed state. 1 exhaust gas blocking means,
A gas flow path between the second incinerator and the second dust collector and a gas flow path between the second dust collector and the second exhaust gas passage can be switched between a opened state and a closed state. 2 exhaust gas blocking means;
A first inflow portion for allowing gas to flow into the heat exchanger from the first incinerator system side;
A second inflow portion for allowing gas to flow into the heat exchanger from the second incinerator system side;
A first outflow part for discharging the gas flowing into the heat exchanger from the first inflow part from the heat exchanger to the first incinerator system;
A second outflow part for discharging the gas flowing into the heat exchanger from the second inflow part to the second incinerator system side from the heat exchanger;
A first heat retaining gas outflow passage communicating the first inflow portion with the first dust collector;
A second heat retaining gas outflow passage communicating the second inflow portion with the second dust collector;
A first heat retaining gas inflow passage communicating the first outflow portion and the first dust collector;
A second heat retaining gas inflow passage communicating the second outflow portion and the second dust collector;
A first branch passage communicating the first inflow portion with a specific first branch portion of the first exhaust gas passage;
A second branch passage communicating the second inflow portion and a specific second branch portion of the second exhaust gas passage;
A first return passage communicating the first outlet and the first return portion downstream of the first branch portion of the first exhaust gas passage;
A second return passage communicating the second outflow portion and a second return portion downstream of the second branch portion of the second exhaust gas passage;
First suction means for sucking the gas in the first inflow part or the first outflow part so that the gas flows from the first inflow part to the first outflow part via the heat exchanger;
A second suction means for sucking the gas in the second inflow portion or the second outflow portion so that the gas flows from the second inflow portion to the second outflow portion via the heat exchanger;
First heat insulation gas passage opening / closing means capable of switching between a state of opening and closing the first heat insulation gas inflow passage and the first heat insulation gas outflow passage;
A second heat insulation gas passage opening / closing means capable of switching between a state in which the second heat insulation gas inflow passage and the second heat insulation gas outflow passage are opened and in a closed state;
First branch passage opening / closing means capable of switching between a state of opening and closing the first branch passage and the first return passage;
A waste treatment facility comprising: a second branch passage opening / closing means capable of switching between a state where the second branch passage and the second return passage are opened and a state where the second return passage is closed.

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