JP2013024504A - Method and system for recovery and use of heat in intermittent operation type refuse incineration facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover and store heat from combustion exhaust gas generated through combustion of refuse during operation of intermittent operation type refuse incineration facilities, and to use the stored heat as a heat source when the facilities are started or stopped.SOLUTION: An air heater 26 for heat storage by indirect heat exchange between combustion exhaust gas and normal-temperature air is provided in a combustion exhaust gas flue from an incinerator 1, and a heat storage device 27 which recovers and stores heat from heated air is provided outside the flue. An air circulation switching supply device 28 which supplies the normal-temperature air and heating air is connected to the air heater 26 for heat storage, heat storage device 27, and incinerator 1. While the incinerator 1 is in operation, the air circulation switching supply device 28 circulates the normal-temperature air between the air heater 26 for heat storage and the heat storage device 27 to store the heat of the air heated by the air heater 26 for heat storage into the heat storage device 27. When the incinerator 1 is started, the normal-temperature air is heated through not the air heater 26 for heat storage, but the heat storage device 27, and then supplied to a starting burner 9 of the incinerator to be used as combustion air for the starting burner 9.

Description

  The present invention is mainly used in an intermittent operation type waste incineration facility that incinerates waste such as municipal waste. During operation of the facility, heat is generated from combustion exhaust gas generated by combustion of waste. The present invention relates to a heat recovery use method and a heat recovery use system for an intermittent operation incineration facility in which the stored heat is stored and used as a heat source when the facility is started or stopped.

  In small-scale waste incineration facilities, intermittent operation is common in order to reduce the amount of waste and to reduce operating costs. That is, in the intermittent operation type waste incineration facility, since the amount of waste to be processed every day is small, the operation is performed for several hours or more than ten hours a day, and the waste is incinerated by the incinerator. .

  FIG. 9 shows an example of a conventional intermittent operation type waste incineration facility, which includes a stoker-type incinerator 1, an exhaust gas temperature reducing tower 2, an air heater 3 for preventing white smoke, and a dust collector. It is composed of a device 4, an induction fan 5, a chimney 6 and the like, and the high-temperature combustion exhaust gas discharged from the stoker-type incinerator 1 is reduced in temperature by the exhaust gas temperature reduction tower 2 and the white smoke prevention air heater 3. After the temperature is adjusted, it is guided to the dust collector 4, and after the fly ash and acid gas in the exhaust gas are removed by the dust collector 4, the clean combustion exhaust gas is discharged from the chimney 6 to the atmosphere. Yes.

  The air heated by indirect heat exchange with the combustion exhaust gas in the white smoke prevention air heater 3 is supplied to the residual heat utilization facility 7, where it is used as a heat source such as the hot water generator 7a, and then the chimney 6 Is mixed with the combustion exhaust gas on the inlet side of the gas and released into the atmosphere.

  In FIG. 9, 9 is an activation burner, 10 is a dust supply hopper, 11 is a dust supply device, 12 is a stalker, 13 is a forced air blower, 14 is a primary air supply duct, 15 is a primary air damper, 16 Is a secondary blower, 17 is a secondary air supply duct, 18 is a damper for secondary air, 19 is a blower for preventing white smoke, 20 is an air supply duct for preventing white smoke, 21 is a slaked lime storage tank, and 22 is an auxiliary agent storage A tank, 23 is a chemical blower, 24 is a fly ash transport device, and 25 is a fly ash storage tank.

By the way, in the intermittent operation type incineration facility described above, since the incinerator 1 must be started and stopped every day, the temperature in the incinerator 1 decreases due to heat radiation or the like while the incinerator 1 is stopped. It will be.
Therefore, when the incinerator 1 is started up, normal temperature air is inserted into the incinerator 1 and the inside of the furnace is heated by combustion of the starter burner 9 using fossil fuel (kerosene or the like) as fuel. There has been a problem that the consumption of fossil fuels (kerosene, etc.) increases compared to the case where hot air is used.

  Further, in the intermittent operation incineration facility, heat recovery from the combustion exhaust gas is performed by indirect heat exchange between the combustion exhaust gas and air in the air heater 3 for preventing white smoke, and the air after using the heat is discharged from the chimney. 6 is mixed with combustion exhaust gas and discharged into the atmosphere, but the recovered heat quantity may not be used effectively. This is because air that has been recovered from heat and heated to high temperatures is generally used for hot water supply and heating in facilities, and to prevent white smoke from exhaust gas, and there is little demand in seasons other than winter and at night.

  Furthermore, in the above intermittent operation type incineration facility, the operation time / time and the heat demand destination / use destination are in spite of the time flow required to improve the heat recovery rate and suppress the emission of greenhouse gases. It was difficult to match the time and time, and the recovered heat that was not used was often released outside the system. Moreover, in facilities that supply heat to the outside, it is not uncommon to maintain a heat supply during facility suspension using fossil fuels after installing a spare boiler, etc. The actual situation is that little consideration is given to the improvement of fuel consumption and the effective use of recovered heat.

  On the other hand, in a waste incineration facility, heat of combustion exhaust gas is stored using a heat storage device, and the stored heat is effectively used.

  Conventionally, as this kind of waste incineration facilities, for example, JP 2001-065840 (Patent Document 1), JP 2010-151432 (Patent Document 2), JP 08-066544 (Patent Document 3). ), JP-A-08-068523 (Patent Document 4), and JP-A-08-189618 (Patent Document 5) are known.

  That is, the waste incineration facility described in Patent Document 1 collects heat from the combustion exhaust gas from which dust has been removed by a high-temperature dust removal device using a heat storage heat exchanger and stores the heat, and stores air at normal temperature with the heat storage type. Heat is passed through a heat exchanger, and the heated air is supplied to a steam generator to generate steam, and then supplied to a reheater to be used as air for preventing white smoke or heated. The air is supplied to the combustion gas turbine and used as combustion air for the combustion gas turbine.

  In addition, the waste incineration facility described in Patent Document 2 is provided with a heat exchanger using mineral oil as a heat medium between a waste heat boiler and a bag filter, and a heat storage device is connected to the heat exchanger. The heat is collected from the exhaust gas by the exchanger, and this heat is stored in the heat storage device.When the heat storage to the heat storage device is completed, the heat storage device is disconnected from the heat exchanger, transported to the heat utilization facility, and stored in the heat utilization facility. The heat of the device is used.

  Furthermore, the waste incineration facility described in Patent Document 3 is connected to the inlet side flue and the outlet side flue of the bag filter with the heat storage material filling portion, and the smoke passing through the water cooling tower is passed through the heat storage material filling portion. If the temperature of flue gas is high, the heat storage material filling part absorbs heat, and if the flue gas temperature is low, heat is released to the heat storage material filling part and the temperature change of the flue gas supplied to the bag filter Furthermore, when the apparatus is started up, the exhaust gas on the outlet side of the bag filter is caused to flow through the heat storage material filling portion to perform heat storage.

  Furthermore, the waste incineration facility described in Patent Document 4 has a boiler installed in the exhaust gas path of the waste incinerator, and a regenerative heating burner is installed at the entrance and exit of the boiler, and is heated when the waste incinerator is stopped. By repeatedly starting and stopping the burner at each start-up time, the boiler is heated to prevent dew point corrosion due to condensation of harmful substances in the exhaust gas, and the exhaust gas from one regenerative heating burner is used effectively. The heat storage body of the heat storage type heating burner is heated, and the combustion air of the heating burner is heated by the heat of the heat storage body to improve the fuel efficiency.

  And the garbage incineration facility described in patent document 5 installed a pair of heat storage body in a waste incinerator, supplied combustion exhaust gas and combustion air to a pair of heat storage body alternately, and was heated by combustion exhaust gas. Combustion air is brought into contact with one heat storage body or the other heat storage body and heated, and the heated combustion air is supplied to a combustion chamber of a waste incinerator.

  In each of the above-mentioned waste incineration facilities using a heat storage device, as the timing of heat storage and heat release, heat storage and heat release are repeated during operation of the furnace, not used during operation of the furnace, It repeats heat dissipation and repeats heat storage and heat dissipation. Also, as uses, it is used for heating combustion air, preventing white smoke, adjusting the inlet temperature of the bag filter, preventing corrosion of boiler water pipes at rest, and for heat sources outside the facility. Furthermore, as a form of the heat storage device itself, one installed in the flue, one installed separately from the flue, one used in a single tank, one that switches between multiple heat storage tanks .

  However, in the waste incineration facilities described in Patent Documents 1 to 5, a point where an independent heat storage device is provided, a point where a heat medium circulates between the heat storage device and the flue, It describes that the combustion air of the heating burner is heated by accumulating the exhaust heat of the burner, that if air is used as the heat medium, there is no problem of low-temperature corrosion during the shutdown, and that it is applied to a quasi-continuous furnace. However, it is not described that heat is collected from the combustion exhaust gas generated by the combustion of waste during operation of the incinerator and stored, and this stored heat is used as a heat source when the incinerator is started. As in the case of the waste incineration facility shown in FIG. 9, improvement in fuel consumption and effective use of recovered heat at the time of facility start-up and facility stop are hardly considered.

JP 2001-065840 A JP 2010-151432 A Japanese Patent Laid-Open No. 08-061654 Japanese Patent Laid-Open No. 08-068523 Japanese Patent Laid-Open No. 08-189618

  The present invention has been made in view of such problems, and its purpose is to recover heat from combustion exhaust gas generated by combustion of waste during operation of an intermittent operation type waste incineration facility. An object of the present invention is to provide a heat recovery use method and heat recovery use system for an intermittent operation type incineration facility that stores heat and uses the stored heat as a heat source when the facility is started or stopped.

  In order to achieve the above object, the first aspect of the present invention provides a combustion exhaust gas and room temperature air in a flue through which a combustion exhaust gas discharged from an incinerator of an intermittent operation type incinerator and subjected to temperature reduction flows. A heat storage air heater that heats room temperature air by indirect heat exchange with the heat storage, and a heat storage device that collects heat from the air heated by the heat storage air heater and stores heat is provided outside the flue, at least for the heat storage Connect an air circulation switching supply device that can appropriately supply room temperature air and heated air to the air heater, heat storage device, and incinerator, and use the heat stored in the heat storage device as a heat source at least when starting up the incinerator This is a method of heat recovery and use for an intermittent operation type incineration facility, and during operation of the incinerator, the air circulation switching supply device circulates normal temperature air between the heat storage air heater and the heat storage device to store heat. For air The heat of the air heated by the heater is stored in the heat storage device, and when starting up the incinerator, the air circulation switching supply device is switched to pass room temperature air through the heat storage device without passing it through the heat storage air heater. The heated air is supplied to the starter burner of the incinerator and used as combustion air for the starter burner.

  According to the second aspect of the present invention, the room temperature air is obtained by indirect heat exchange between the combustion exhaust gas and the room temperature air in the flue through which the combustion exhaust gas discharged from the incinerator of the intermittent operation type waste incineration facility and subjected to temperature reduction treatment flows. A heat storage air heater for heating the heat storage, and a heat storage device for recovering heat from the air heated by the heat storage air heater for heat storage is provided outside the flue, and at least the heat storage air heater, the heat storage device, and incineration An intermittent operation waste incineration facility in which an air circulation switching supply device capable of appropriately supplying normal temperature air and heated air is connected to the furnace, and the heat stored in the heat storage device is used as a heat source at least when the incinerator is started. During the operation of the incinerator, the room temperature air was circulated between the heat storage air heater and the heat storage device by the air circulation switching supply device and heated by the heat storage air heater. Air heat Heat is stored in the heat storage device, and when the incinerator starts up, the air circulation switching supply device is switched to heat normal temperature air through the heat storage device without passing through the heat storage air heater, and this heated air is incinerator It is characterized in that it is supplied to the starter burner and the stoker of the incinerator, respectively, and used as the combustion air of the starter burner and the air under the stoker.

  According to the third aspect of the present invention, the room temperature air is obtained by indirect heat exchange between the combustion exhaust gas and the room temperature air in the flue through which the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility flows. A heat storage air heater for heating the heat storage, and a heat storage device for recovering heat from the air heated by the heat storage air heater to store heat is provided outside the flue, and at least the heat storage air heater, heat storage air heating Connect the air circulation switching supply device that can supply normal temperature air and heated air to the air heater for preventing white smoke, the heat storage device and the incinerator installed at the rear stage of the cooler, and incinerate at least the heat stored in the heat storage device This is a method of heat recovery and use of an intermittent operation incineration facility that is used as a heat source when the furnace is started up. During operation of the incinerator, room temperature air is heated by air circulation switching supply equipment to prevent white smoke Heat storage The heat of the air heated by the heat storage air heater through the air heater and the heat storage device is stored in the heat storage device, and the air that has passed through the heat storage device is turned into a white smoke prevention air heater and a heat storage air heater. When the incinerator is started, the air circulation switching supply device is switched to heat normal temperature air through the heat storage device, and this heated air is supplied to the incinerator start burner to burn the start burner. It is characterized by the fact that it is used as working air.

  In the invention of claim 4 of the present invention, when the intermittent operation type incineration facility is stopped, the air circulation switching supply device heats the room temperature air through the heat storage device, and the heated air is supplied to another facility other than the waste incineration facility. It is characterized in that it is supplied to the apparatus and used as a heat source for supplying external heat.

  The invention of claim 5 of the present invention recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and reduced in temperature, stores the heat, and stores the stored heat at least when the facility is started. A heat recovery and utilization system for an intermittent operation incineration facility that is used as a heat source, wherein the heat recovery and utilization system is provided in a flue through which the exhaust gas subjected to temperature reduction treatment flows, and the combustion exhaust gas and room temperature air A heat storage air heater that heats room temperature air by indirect heat exchange with the heat storage device, a heat storage device that is provided outside the flue, collects heat from the air heated by the heat storage air heater, and stores heat, and at least for the heat storage Connected to an air heater, heat storage device and incinerator, normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the taken-in normal temperature air is not passed through the heat storage air heater to the heat storage device. It is characterized from the to heating that is composed of at least incinerator air circulation switching supply device capable of supplying to the start burner.

  The invention of claim 6 of the present invention recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and reduced in temperature, stores the heat, and stores the stored heat at least when the facility is started up. A heat recovery and utilization system for an intermittent operation incineration facility that is used as a heat source, wherein the heat recovery and utilization system is provided in a flue through which the exhaust gas subjected to temperature reduction treatment flows, and the combustion exhaust gas and room temperature air A heat storage air heater that heats room temperature air by indirect heat exchange with the heat storage device, a heat storage device that is provided outside the flue, collects heat from the air heated by the heat storage air heater, and stores heat, and at least for the heat storage Connected to an air heater, heat storage device and incinerator, normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the taken-in normal temperature air is not passed through the heat storage air heater to the heat storage device. And it is characterized in that it is composed is heated to at least incinerators start burner and incinerator air circulation switching supply device capable of supplying to both under stoker of.

  The invention according to claim 7 of the present invention recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and subjected to temperature reduction treatment, stores the heat, and stores the stored heat at least when the facility is started up. A heat recovery and utilization system for an intermittent operation incineration facility that is used as a heat source, wherein the heat recovery and utilization system is provided in a flue through which the exhaust gas subjected to temperature reduction treatment flows, and the combustion exhaust gas and room temperature air A heat storage air heater that heats room temperature air by indirect heat exchange with the heat storage device, a heat storage device that is provided outside the flue, collects heat from the air heated by the heat storage air heater, and stores heat, and at least for the heat storage Connected to the air heater, the air heater for preventing white smoke, the heat accumulator and the incinerator installed after the air heater for heat accumulating, the air heater for storing the normal temperature air, the air heater for preventing white smoke and the heat accumulator Through The air heated by the heat storage device can be returned to the white smoke prevention air heater and the heat storage air heater, and the taken-in room temperature air is heated through the heat storage device and then supplied to at least the burner for starting the incinerator. It is characterized by comprising an air circulation switching supply device to obtain.

  The invention of claim 8 of the present invention is characterized in that the heat storage device comprises a waste heat recovery boiler with a brackish water drum.

  The invention of claim 9 of the present invention is such that the heat storage device is connected to the exhaust heat recovery boiler with brackish water drum and the exhaust heat recovery boiler with brackish water drum, and can store heat from the exhaust heat recovery boiler with brackish water drum, It is characterized by comprising a steam accumulator that can supply heat to an exhaust heat recovery boiler with brackish water drum.

According to the first aspect of the present invention, during operation of the incinerator, normal temperature air is circulated between the heat storage air heater and the heat storage device by the air circulation switching supply device and is heated by the heat storage air heater. The air heat is stored in the heat storage device, and when the incinerator is started up, the air circulation switching supply device is switched to heat the room temperature air through the heat storage device without passing through the heat storage air heater. Since the heated air is supplied to the startup burner of the incinerator and used as the combustion air of the startup burner, the fuel consumption of the startup burner during startup can be reduced.
Further, according to the first aspect of the present invention, a heat storage air heater is disposed in the flue through which the temperature-reduced combustion exhaust gas flows to recover heat necessary for the heat storage device from the combustion exhaust gas. For example, combustion exhaust gas is cooled and waste heat is recovered by an air heater for preventing white smoke (indirect heat exchanger for gas and air) provided on the rear side of the air heater for heat storage, and high-temperature air after heat utilization is recovered. In the case where the present invention is applied to a facility that is mixed with combustion exhaust gas at the inlet side of the chimney and released into the atmosphere, the combustion exhaust gas is cooled by the heat storage air heater, so that the latter stage of the heat storage air heater The amount of air required for the air heater for preventing white smoke on the side is reduced, and the amount of air mixed into the combustion exhaust gas is inevitably reduced, so that the diameter of the chimney can be reduced.

According to the second aspect of the present invention, during operation of the incinerator, normal temperature air is circulated between the heat storage air heater and the heat storage device by the air circulation switching supply device and is heated by the heat storage air heater. The air heat is stored in the heat storage device, and when the incinerator is started up, the air circulation switching supply device is switched to heat the room temperature air through the heat storage device without passing through the heat storage air heater. Since the heated air is supplied to the starter burner of the incinerator and the stoker of the incinerator, respectively, and is used as the combustion air of the starter burner and the air under the stoker, the same as the invention of claim 1 of the present invention The effect of this can be achieved.
Moreover, in the invention of claim 2 of the present invention, the air heated by the heat storage device is supplied under the stoker and used as the air under the stoker. During the period, the dust on the stoker can be dried and burned well and reliably without using an air preheater provided between the forced blower and the stoker.

  According to the third aspect of the present invention, during operation of the incinerator, the air circulation switching supply device passes normal temperature air through the air heater for preventing white smoke, the air heater for heat storage, and the heat storage device to heat the air for heat storage. The heat of the air heated by the cooler is stored in the heat storage device, and the air that has passed through the heat storage device is returned to the white smoke prevention air heater and the heat storage air heater, and when the incinerator starts up, the air circulation is switched. Since the normal temperature air is heated through the heat storage device by switching the supply device, this heated air is supplied to the start burner of the incinerator and used as the combustion air of the start burner. The same effect as that of the invention of claim 1 can be obtained.

  According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, when the intermittent operation type waste incineration facility is stopped, the air circulation switching supply device converts the room temperature air into the heat storage device. Since this heated air is supplied to a device (for example, a hot water supply device or a heating device) in another facility other than the waste incineration facility and used as a heat source for external heat supply, the present invention The effects similar to those of the first to third aspects of the invention can be obtained, and the recovered heat can be effectively used even when the facility is stopped.

  The heat recovery and utilization system according to claim 5 of the present invention recovers heat from a heat storage air heater that heats room temperature air by indirect heat exchange between combustion exhaust gas and room temperature air, and air heated by the heat storage air heater. Heat storage device, and normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the introduced normal temperature air is not passed through the heat storage air heater and heated through the heat storage device. And at least an air circulation switching supply device capable of supplying the starter burner of the incinerator, so that the method according to the first aspect of the present invention can be suitably carried out, and the first aspect of the present invention is also provided. The same effects as those of the present invention can be achieved.

  The heat recovery and utilization system according to claim 6 of the present invention recovers heat from the air heater for storing heat by indirect heat exchange between combustion exhaust gas and room temperature air, and air heated by the air heater for storing heat. Heat storage device, and normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the introduced normal temperature air is not passed through the heat storage air heater and heated through the heat storage device. 2 is provided with an air circulation switching supply device that can supply at least the burner for starting up the incinerator and the stoker of the incinerator, so that the method according to claim 2 of the present invention can be suitably carried out. In addition, the same effect as that of the second aspect of the present invention can be achieved.

  The heat recovery and utilization system according to claim 7 of the present invention recovers heat from the air heater for heat storage that heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air, and the air heated by the air heater for heat storage. Heat storage device for storing heat and air at normal temperature through a heat storage air heater, white smoke prevention air heater and heat storage device, and the air heated by the heat storage device for white smoke prevention air heater and heat storage air heating And an air circulation switching supply device capable of supplying the room temperature air taken in through the heat storage device and then supplying it to the burner for starting the incinerator at least. The described method can be suitably carried out, and the same effects as those of the invention of claim 3 of the present invention can be achieved.

  In the heat recovery and utilization system according to claim 8 of the present invention, since the heat storage device is composed of a waste heat recovery boiler with a brackish water drum, new technical development of the heat storage device becomes unnecessary, and an existing waste heat recovery boiler with a brackish water drum is used. Can be very convenient.

  In the heat recovery utilization system according to the ninth aspect of the present invention, the heat storage device is composed of the exhaust heat recovery boiler with the steam drum and the steam accumulator, so that the heat storage capacity can be increased.

1 is a schematic system diagram showing an example of an intermittent operation type waste incineration facility to which the present invention is applied. It is the schematic which shows an example of the thermal storage apparatus used for an intermittent operation type | system | group waste incineration facility. It is the schematic which shows the other example of the heat storage apparatus used for the intermittent operation type | mold garbage incineration facility. It is a general | schematic systematic diagram which shows the other example of the intermittent operation type waste incineration facility to which this invention is applied. It is a schematic system diagram which shows the further another example of the intermittent operation type waste incineration facility to which this invention is applied. It is a graph which shows the time change of the air temperature at the time of furnace starting of the system of this invention, and the conventional system. It is a graph which shows the time change of the air quantity at the time of furnace starting of the system of this invention, and the conventional system. It is a graph which shows the time change of the kerosene usage-amount at the time of the furnace starting of the system of this invention, and the conventional system. It is a schematic system diagram which shows an example of the conventional intermittent operation type waste incineration facility.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic system diagram showing an example of an intermittent operation type waste incineration facility to which the present invention is applied. The waste incineration facility is a stoker-type incinerator 1 for incinerating municipal waste and the like and discharged from the incinerator 1. Exhaust gas temperature reducing tower 2 for reducing the temperature of the generated high-temperature combustion exhaust gas, and further reducing the temperature of the combustion exhaust gas reduced in temperature in the exhaust gas temperature reduction tower 2 and heating the white smoke prevention air A heater 3, a dust collector 4 for removing fly ash and acid gas in the exhaust gas, an induction fan 5 for sucking the combustion exhaust gas in the incinerator 1, and a chimney 6 for releasing the combustion exhaust gas to the atmosphere , Recovering heat from the residual heat utilization equipment 7 including a hot water generator 7a using the heated air from the air heater 3 for preventing white smoke as a heat source and the combustion exhaust gas discharged from the incinerator 1 to store the heat. This stored heat can be used as a heat source when the facility is started or stopped. A heat recovery and utilization system 8 to be used. During operation of the incinerator 1, the heat recovery and utilization system 8 is used to recover heat from the combustion exhaust gas discharged from the incinerator 1 and store the heat. At the start of the incinerator 1, room temperature air is heated by the heat stored using the heat recovery utilization system 8, and this heated air is supplied to the start burner 9 of the incinerator 1 to burn the combustion air of the start burner 9. I am trying to use it.

In FIG. 1, 10 is a waste hopper, 11 is a dust supply device, 12 is a stalker, 13 is a pusher fan, 14 is a primary air supply duct, 15 is a damper for primary air, 16 is a secondary fan, 17 Is a secondary air supply duct, 18 is a secondary air damper, 19 is a blower for preventing white smoke, 20 is an air supply duct for preventing white smoke, 21 is a slaked lime storage tank, 22 is an auxiliary agent storage tank, and 23 is for a medicine. A blower, 24 is a fly ash transport device, and 25 is a fly ash storage tank.
In addition, facilities and equipment other than the heat recovery utilization system 8 (incinerator 1, exhaust gas temperature reduction tower 2, white smoke prevention air heater 3, dust collector 4, induction fan 5 and residual heat utilization equipment 7, etc.) Since it has the same structure as a conventionally known one, its detailed description is omitted here.

  The heat recovery and utilization system 8 is provided in a flue through which combustion exhaust gas discharged from the incinerator 1 and subjected to temperature reduction flows, and heat storage air heating that heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air. A heat storage device 27 that is provided outside the flue, collects heat from the air heated by the heat storage air heater 26 and stores the heat, and the heat storage air heater 26, the heat storage device 27, and the incinerator 1. It is connected, and normal temperature air can be circulated between the heat storage air heater 26 and the heat storage device 27, and the introduced normal temperature air is heated through the heat storage device 27 without passing through the heat storage air heater 26. It comprises at least an air circulation switching supply device 28 that can be supplied to the starter burner 9 of the incinerator 1.

  Specifically, the heat storage air heater 26 is provided in a flue where the temperature of the combustion exhaust gas is approximately 450 ° C. or less and approximately 300 ° C. or more, and the combustion exhaust gas and air are removed during operation of the incinerator 1. Indirect heat exchange is performed so that high-temperature air of approximately 300 ° C. or less can be obtained.

  In this embodiment, the heat storage air heater 26 includes a steel plate casing 26a and a heat transfer pipe 26b disposed in the casing 26a, and the exhaust gas temperature reducing tower 2 and the white smoke prevention air heater 3 It is provided on the inlet side of the air heater 3 for preventing white smoke in the middle flue.

  The reason for installing the heat storage air heater 26 at about 450 ° C. or less is to avoid the heat-resistant temperature of the steel plate casing 26a and the high-temperature corrosion of the gas side of the heat transfer tube 26b. The reason why the temperature is equal to or higher than C is to increase the amount of heat stored by increasing the pressure in the heat storage device 27 so that the temperature of the heated air can be increased to 250 ° C. or higher. Furthermore, low temperature corrosion can be avoided when normal temperature air is ventilated.

  The heat storage device 27 indirectly heat-exchanges high-temperature air and heat transfer fluid during operation of the incinerator 1 to store heat in the heat transfer solution, and the stored heat is stored in the room temperature air when the incinerator 1 is started next time after the incinerator 1 is stopped. If the heat transfer liquid is water, it is sealed in a pressure vessel so that the pressure is increased to atmospheric pressure or higher and approximately 4 MPa or lower. In addition, when heat medium oil is used as the heat medium liquid, it is possible to use an apparatus having a design pressure of about 1 MPa as an operating temperature below the boiling point.

  In this embodiment, the heat storage device 27 is a waste heat recovery boiler with a brackish drum using water as a heat medium, or a combination of a waste heat recovery boiler with a brackish water drum and a steam accumulator 33. .

In particular, the latter heat storage device 27 can increase the amount of heat stored by adding a steam accumulator 33 to the exhaust heat recovery boiler with a brackish water drum, and the amount of heat of the exhaust heat recovery boiler with a brackish water drum is insufficient. The heat storage amount is supplemented by the steam accumulator 33.
The steam accumulator 33 is configured to accumulate steam as hot water by blowing steam from the boiler into the hot water inside the tank, and take out and use the steam that self-evaporates in the tank as necessary. Has been.

  FIG. 2 shows a heat storage device 27 composed of an exhaust heat recovery boiler with a brackish water drum. The heat storage device 27 includes a casing 29 having an air inlet 29a and an air outlet 29b, and a brackish drum 30 disposed on the upper portion of the casing 29. The water drum 31 is disposed in the lower portion of the casing 29, and the water drum group 32 is disposed in the casing 29 and connects the brackish water drum 30 and the water drum 31.

FIG. 3 shows a heat storage device 27 comprising an exhaust heat recovery boiler with a brackish water drum and a steam accumulator 33. The heat storage device 27 is connected to the braided water drum 30 and the water drum 31 of the above-described exhaust heat recovery boiler with a steam water drum and an upper connecting pipe 34. And the steam accumulator 33 is connected via the lower connecting pipe 35, and the water level of both is balanced.
That is, when steam generated in the exhaust heat recovery boiler with a brackish water drum is sent to the steam accumulator 33 and the water level of the steam accumulator 33 rises, high temperature water is supplied to the exhaust heat recovery boiler with a braid water drum through the lower connecting pipe 35. It has become.
Further, when the air is heated at the time of start-up, steam is extracted from the upper part of the steam accumulator 33 and supplied to the exhaust heat recovery boiler with the steam drum via the steam supply pipe 36, and the water inside the exhaust heat recovery boiler with the steam drum is drained. It comes to heat.

  The heat storage device 27 composed of the exhaust heat recovery boiler with brackish water drum raises and pressurizes internal water (heat medium liquid) by aeration of high-temperature air, and boosts the pressure up to approximately 4 MPa (saturation temperature of about 254 ° C.) at maximum. It is like that.

It should be noted that the pressure of water (heat medium liquid) is increased to 4 MPa because the economical design viewpoint of the heat storage device 27 by the maximum temperature (approximately 300 ° C.) of the high temperature air obtained by the heat storage air heater 26, the highest temperature of the high temperature air The temperature is determined from the viewpoint of economic design based on the maximum temperature of 450 ° C. of the combustion exhaust gas on the inlet side of the heat storage air heater 26.
Further, although not shown, the heat storage device 27 is devised so as to sufficiently keep the heat and reduce the heat radiation during the stop as much as possible.

  The air circulation switching supply device 28 is connected to the heat storage air heater 26, the heat storage device 27, and the incinerator 1, and can circulate room temperature air between the heat storage air heater 26 and the heat storage device 27. At the same time, the taken-in room temperature air can be supplied to the starter burner 9 of the incinerator 1 after being heated through the heat storage device 27 without passing through the heat storage air heater 26, and during the operation of the incinerator 1. Circulates normal temperature air between the heat storage air heater 26 and the heat storage device 27 to store the heat of the air heated by the heat storage air heater 26 in the heat storage device 27, and to start the incinerator 1 Sometimes, normal temperature air is heated not through the heat storage air heater 26 but through the heat storage device 27, and this heated air can be supplied to the starter burner 9 of the incinerator 1.

  In this embodiment, the air circulation switching supply device 28 is for air circulation that connects the outlet of the heat storage air heater 26 and the inlet of the heat storage device 27, and the inlet of the heat storage air heater 26 and the outlet of the heat storage device 27, respectively. A duct 37, a heat storage air circulation blower 38 interposed in the air circulation duct 37 connected to the inlet side of the heat storage device 27, and an air interposed in the air circulation duct 37 on the inlet / outlet side of the heat storage air heater 26 An air intake duct 40 connected to the air circulation duct 37 between the air damper 39, the heat storage air circulation blower 38, and the air damper 39, and taking in normal temperature air as start-up air; A room temperature air damper 41 interposed in the intake duct 40, and an air circulation duct 37 between the outlet of the heat storage device 27 and the air damper 39 are connected in a branched manner. Air burner air duct 42 for supplying the combustion air to the start burner 9 which is, and a heated air damper 43 which is interposed in the burner air duct 42.

  In addition, the air circulation switching supply device 28 adjusts the amount of heat stored in the heat storage device 27 by releasing heated air into the atmosphere so that the heat stored in the heat storage device 27 does not exceed the required capacity. The heat storage adjusting duct 44 is used during operation of the incinerator 1.

The heat storage adjustment duct 44 is connected in a branched manner to the air circulation duct 37 between the outlet of the heat storage device 27 and the air damper 39. The heat storage adjustment duct 44 has a discharge amount of heated air. A heat storage adjusting damper 46 to be adjusted is interposed.
When the heat storage adjustment duct 44 and the heat storage adjustment damper 46 are used, room temperature air is taken in using the air intake duct 40 and the room temperature air damper 41.

  Thus, in the intermittent operation type incineration facility using the heat recovery utilization system 8 described above, during operation of the incinerator 1, heat is recovered from the combustion exhaust gas discharged from the incinerator 1. When heat is stored and the incinerator 1 is started, the stored heat can be used as a heat source.

  That is, during the operation of the incinerator 1, the air damper 39 on the inlet / outlet side of the heat storage air heater 26 is opened, and the room temperature air damper 41, the heated air damper 43, and the heat storage adjustment damper 46 are closed. Then, the heat storage air circulation blower 38 is operated to circulate the air in the air circulation duct 37 or the heat storage device 27 between the heat storage air heater 26 and the heat storage device 27.

  The air temperature on the inlet side of the heat storage air heater 26 varies depending on the temperature (internal pressure) of the heat storage device 27. Further, at the beginning of the operation immediately after the start of the incinerator 1, almost no heat remains in the heat storage device 27, and the heat storage device 27 is close to room temperature.

  Accordingly, the air in the heat storage device 27 or the like is room temperature air, and this room temperature air enters the heat storage air heater 26 where it is heated by indirect heat exchange with the combustion exhaust gas (for example, 100 ° C.). The temperature of the heat storage device 27 is entered.

  The heated air that has entered the heat storage device 27 heats the heat transfer fluid in the heat storage device 27 (for example, when the heat transfer fluid is boiler water, the boiler water is heated to 50 ° C.) and is reduced by the heat transfer fluid. The temperature is lowered (for example, heated air is reduced to 70 ° C.).

  The air whose temperature has been reduced in the heat storage device 27 enters the heat storage air heater 26, where it is heated again by indirect heat exchange with the combustion exhaust gas (for example, raised to 150 ° C.), and then again. The heating medium liquid is heated in the heat storage device 27 (for example, when the heating medium liquid is boiler water, the boiler water is heated to 100 ° C.) and the temperature is reduced by the heat medium liquid (for example, 120 ° C.). The temperature is reduced.

  In this way, heating was performed until the air temperature on the inlet side of the heat storage device 27 was 300 ° C., the temperature of the heat transfer fluid (boiler water) was 250 ° C., and the air temperature on the outlet side of the heat storage device 27 was about 270 ° C. Air is circulated between the heat storage air heater 26 and the heat storage device 27 to store heat in the heat storage device 27.

  When the incinerator 1 is stopped, the heat storage air heater 26, the heat storage device 27, and the heat storage air circulation blower 38 are stopped, and the air damper 39 provided on the inlet / outlet side of the heat storage air heater 26 is closed. The waste incinerator 1 is maintained in a stopped state until the next start-up.

  When the incinerator 1 is started, the room temperature air damper 41 and the heated air damper 43 provided in the air intake duct 40 and the burner air duct 42 are opened, and the heat storage air circulation blower 38 is started in this state. .

  Then, the normal temperature air flowing in from the air intake duct 40 enters the heat storage device 27 through the heat storage air circulation blower 38 and the air circulation duct 37 on the inlet side of the heat storage device 27 and is heated there. Is supplied to the starter burner 9 through the air circulation duct 37 and the burner air duct 42 on the outlet side of the heat storage device 27, and used as combustion air for the starter burner 9.

In addition, since the temperature of the heat storage device 27 is high at the start, the air temperature on the outlet side of the heat storage device 27 can be increased (for example, 200 ° C.). Since the temperature of the heat storage device 27 decreases as the start-up progresses, the air temperature on the outlet side of the heat storage device 27 also decreases accordingly.
Therefore, the heat storage device 27 is designed to store the amount of heat necessary until the start of the incinerator 1 is completed.
When the amount of heat in the heat storage device 27 is insufficient, the heat storage device 27 is a combination of a steam heat drum-attached exhaust heat recovery boiler and a steam accumulator 33, and the steam accumulator 33 supplements the heat storage amount. .

The intermittent operation type incineration facility described above uses the heat recovery utilization system 8, and during operation of the incinerator 1, heat is collected from the combustion exhaust gas discharged from the incinerator 1, and is stored. At startup, the stored heat is used as a heat source, and the air supplied to the startup burner 9 is heated by the stored heat and this heated air is used as combustion air. The fuel consumption of the starting burner 9 can be reduced.
In addition, in this intermittent operation type incineration facility, a heat storage air heater 26 is disposed in front of the white smoke prevention air heater 3 so as to recover heat necessary for the heat storage device 27 from the combustion exhaust gas. Therefore, the combustion exhaust gas is cooled by the heat storage air heater 26 before entering the white smoke prevention air heater 3, and the white smoke prevention air heater 3 installed on the rear stage side of the heat storage air heater 26 is used. Therefore, the amount of air mixed with the combustion exhaust gas on the inlet side of the chimney 6 inevitably decreases, and the diameter of the chimney 6 can be reduced.

  FIG. 4 is a schematic system diagram showing another example of the intermittent operation type waste incineration facility to which the present invention is applied, and the waste incineration facility has improved the air circulation switching supply device 28 of the heat recovery utilization system 8. During operation of the incinerator 1, heat is recovered from the combustion exhaust gas discharged from the incinerator 1 by using the heat recovery utilization system 8, and heat is recovered when the incinerator 1 is started. The room temperature air is heated by the heat stored using the utilization system 8, and the heated air is supplied to the starter burner 9 of the incinerator 1 and the stoker of the incinerator 1, respectively, and the combustion air of the starter burner 9 and It is designed to be used as air under the stalker.

  That is, the air circulation switching supply device 28 of the heat recovery and utilization system 8 includes an outlet of the heat storage air heater 26 and an inlet of the heat storage device 27 and an inlet of the heat storage air heater 26 and the heat storage device 27 as shown in FIG. The air circulation duct 37 that connects the outlets of the heat storage device 27, the heat storage air circulation blower 38 that is interposed in the air circulation duct 37 that is connected to the inlet side of the heat storage device 27, and the air at the inlet / outlet side of the heat storage air heater 26 An air damper 39 interposed in the circulation duct 37, a heat storage air circulation blower 38, and the air damper 39 are connected in a branched manner to the air circulation duct 37, and normal temperature air is taken in as starting air. The air intake duct 40, the room temperature air damper 41 interposed in the air intake duct 40, and the air circulation duct 37 are branchedly connected between the outlet of the heat storage device 27 and the air damper 39. The burner air duct 42 that supplies the air heated by the heat storage device 27 as combustion air to the starter burner 9, the heated air damper 43 interposed in the burner air duct 42, and the heated air damper 43 Is connected to the burner air duct 42 and the primary air supply duct 14 in a branched manner, and the air heated by the heat storage device 27 is supplied to the primary air supply duct 14 and supplied as the air under the stalker of the incinerator 1. A lower air duct 48 and a heated air damper 43 interposed in the stoker lower air duct 48 are configured.

  It should be noted that facilities and equipment other than the air circulation switching supply device 28 (incinerator 1, exhaust gas temperature reducing tower 2, white smoke prevention air heater 3, dust collector 4, residual heat utilization equipment 7, heat storage air heater 26 The heat storage device 27, etc.) is configured in the same structure as the waste incineration facility shown in FIG. 1, and the same parts and members as those in the waste incineration facility shown in FIG. Is omitted.

  In the intermittent operation type waste incineration facility using the heat recovery utilization system 8 shown in FIG. 4, during the operation of the incinerator 1, the heat recovery utilization system 8 performs the intermittent operation type waste incineration facility shown in FIG. 1. It functions in the same manner as the heat recovery and utilization system 8, recovers heat from the combustion exhaust gas discharged from the incinerator 1 by the heat storage air heater 26 and stores it in the heat storage device 27, and when the incinerator 1 is stopped. 1, the heat storage air heater 26, the heat storage device 27, and the heat storage air circulation blower 38 are stopped and provided on the entrance / exit side of the heat storage air heater 26 as in the intermittent operation type incineration facility shown in FIG. 1. The air damper 39 and the like are closed, and the stopped state is maintained until the next start-up of the waste incinerator 1.

  When the incinerator 1 is started, the room temperature air damper 41 and the heating air damper 43 provided in the air intake duct 40, the burner air duct 42 and the stoker air duct 48 are opened, and in this state, the heat storage air is opened. The circulation fan 38 is activated.

  Then, the room temperature air that has flowed into the air intake duct 40 from the forced blower 13 enters the heat storage device 27 through the heat storage air circulation blower 38 and the air circulation duct 37 on the inlet side of the heat storage device 27, where After being heated, the air circulation duct 37, the burner air duct 42, the stoker lower air duct 48, and the primary air supply duct 14 on the outlet side of the heat storage device 27 are supplied to the start burner 9 and the lower stoker, respectively. It is used as combustion air for the starter burner 9 and air under the stoker.

The intermittent operation type waste incineration facility shown in FIG. 4 described above can achieve the same effects as the intermittent operation type waste incineration facility shown in FIG.
In particular, since this waste incineration facility supplies the air heated by the heat storage device 27 to the bottom of the stoker and uses it as the air under the stoker, the waste incinerator 1 is started for a while after starting the introduction of the waste at the start-up of the incinerator 1. In the meantime, without using an air preheater (not shown) provided between the forced blower 13 and the stoker 12, the dust on the stoker can be dried and burned well and reliably.

  FIG. 5 is a schematic system diagram showing still another example of the intermittent operation type waste incineration facility to which the present invention is applied. The waste incineration facility is improved in the heat recovery utilization system 8 and is shown in FIGS. The heat storage air circulation blower 38 shown is omitted, and the heat storage air is sent by the white smoke prevention blower 19. During the operation of the incinerator 1, the heat recovery utilization system 8 is used for the incinerator. Heat is recovered from the combustion exhaust gas discharged from 1 and stored, and when the incinerator 1 is started, air at normal temperature is heated by the heat stored using the heat recovery utilization system 8 and the heated air is incinerated. This is supplied to the starter burner 9 of the furnace 1 and used as combustion air for the starter burner 9.

  That is, as shown in FIG. 5, the heat recovery utilization system 8 is provided in the flue on the inlet side of the white smoke prevention air heater 3 and heats the room temperature air by indirect heat exchange between the combustion exhaust gas and the room temperature air. A heat storage air heater 26, a heat storage device 27 that is provided outside the flue and collects heat from the air heated by the heat storage air heater 26 and stores the heat, the heat storage air heater 26, and heat storage air heating Connected to the air heater 3 for preventing white smoke, the heat storage device 27 and the incinerator 1 installed at the subsequent stage of the heat generator 26, and normal temperature air is supplied to the air heater 26 for heat storage, the air heater 3 for preventing white smoke and the heat storage device 27. The air heated by the heat accumulator 27 can be returned to the white smoke prevention air heater 3 and the heat accumulator air heater 26, and the taken-in room temperature air is heated through the heat accumulator 27 before being heated in the incinerator 1. Empty that can be supplied to the starting burner 9 And a circulation switching supply apparatus 28..

Equipment and equipment other than the air circulation switching supply device 28 of the heat recovery utilization system 8 (incinerator 1, exhaust gas temperature reduction tower 2, white smoke prevention air heater 3, dust collector 4, residual heat utilization equipment 7, heat storage The air heater 26, the heat storage device 27, etc.) are configured in the same structure as the waste incineration facility shown in FIG. 1, and the same parts and members as those in the waste incineration facility shown in FIG. Detailed description thereof will be omitted.
Although not shown, a heat storage adjustment duct 44 is connected to the air switching supply device.

  The air circulation switching supply device 28 of the heat recovery utilization system 8 is connected to the white smoke prevention blower 19, the inlet of the heat storage air heater 26 and the inlet of the white smoke prevention air heater 3, and A white smoke prevention air supply duct 20 connected to the prevention blower 19, an air circulation duct 37 connecting the outlet of the heat storage air heater 26 and the inlet of the heat storage device 27, and the heat storage air heater 26. An air damper 39 interposed in the air circulation duct 37 on the outlet side, and a heated air supply duct 50 connected to the outlet of the heat storage device 27 and connected to the upstream duct 49 of the white smoke prevention blower 19 in a branched manner. And an air damper 39 interposed in the heated air supply duct 50 and a bar connected to the heated air supply duct 50 in a branched manner and supplying the air heated by the heat storage device 27 to the starting burner 9 as combustion air. And Na air duct 42, and a heated air damper 43 which is interposed in the burner air duct 42.

  In the intermittent operation type waste incineration facility using the heat recovery utilization system 8 shown in FIG. 5, during operation of the incinerator 1, the air damper 39 of the air circulation duct 37 and the air of the heating air supply duct 50 are used. The air damper 39 is opened and the heating air damper 43 is closed. In this state, the white smoke prevention blower 19 is operated, and the room temperature air is turned into the white smoke prevention air heater 3, the heat storage air heater 26 and the heat storage device 27. Pass through.

  The air temperature on the inlet side of the heat storage air heater 26 varies depending on the temperature (internal pressure) of the heat storage device 27. Further, at the beginning of the operation immediately after the start of the incinerator 1, almost no heat remains in the heat storage device 27, and the heat storage device 27 is close to room temperature.

  Accordingly, the air in the heat storage device 27 or the like is room temperature air, and this room temperature air enters the heat storage air heater 26 where it is heated by indirect heat exchange with the combustion exhaust gas (for example, 100 ° C.). The temperature of the heat storage device 27 is entered.

  The heated air that has entered the heat storage device 27 heats the heat transfer fluid in the heat storage device 27 (for example, when the heat transfer fluid is boiler water, the boiler water is heated to 50 ° C.) and is reduced by the heat transfer fluid. The temperature is lowered (for example, heated air is reduced to 70 ° C.).

  The air exiting the heat storage device 27 is mixed with room temperature air flowing in the upstream duct 49 on the inlet side of the white smoke prevention fan 19, and a part thereof is sent to the white smoke prevention air heater 3. The air heated by the white smoke prevention air heater 3 (for example, air at 170 ° C.) is supplied to the residual heat utilization facility 7 where it is used as a heat source for the hot water generator 7a and the like. It is mixed with combustion exhaust gas at the inlet side and released into the atmosphere.

  On the other hand, the remaining air (for example, air at 45 ° C.) sent by the white smoke prevention blower 19 enters the heat storage air heater 26 where the temperature is raised again by indirect heat exchange with the combustion exhaust gas (for example, After the temperature is raised to 125 ° C., the heat storage device 27 is entered again.

  The heated air that has entered the heat storage device 27 again heats the heat transfer fluid in the heat storage device 27 (for example, when the heat transfer fluid is boiler water, the boiler water is heated to 75 ° C.) and the heat transfer medium. The temperature is reduced by the liquid (for example, the temperature of the air is reduced to 95 ° C.).

  In this way, heating is performed until the air temperature on the inlet side of the heat storage device 27 is 300 ° C., the temperature of the heat transfer fluid (boiler water) is 250 ° C., and the air temperature on the outlet side of the heat storage device 27 is about 270 ° C. The stored air is passed through the heat storage air heater 26 and the heat storage device 27 and stored in the heat storage device 27.

  When the incinerator 1 is stopped, the heat storage air heater 26, the heat storage device 27, and the white smoke prevention blower 19 are stopped, and the air damper 39 and the heating air supply duct 50 provided in the air circulation duct 37 are stopped. The air damper 39 and the like provided in are closed, and the stopped state is maintained until the next start-up of the refuse incinerator 1.

  When the incinerator 1 is started, the air damper 39 and the heated air damper 43 provided in the air circulation duct 37 and the burner air duct 42 are opened, and the white smoke prevention blower 19 is started.

  Then, the room temperature air flowing from the upstream duct 49 of the white smoke prevention fan 19 passes through the white smoke prevention fan 19, the white smoke prevention air supply duct 20, the heat storage air heater 26, and the air circulation duct 37. Then, it enters the heat storage device 27 and is heated here, and then supplied to the starter burner 9 through the heated air supply duct 50 and the burner air duct 42 and used as combustion air of the starter burner 9.

The intermittent operation type waste incineration facility shown in FIG. 5 described above can achieve the same effects as the intermittent operation type waste incineration facility shown in FIG.
In particular, this waste incineration facility uses a white smoke prevention blower 19 to send heat storage air to the heat storage air heater 26, the heat storage device 27, and the like. The air circulation blower 38 can be omitted, and the cost can be reduced.
In addition, this intermittent operation type incineration facility mixes the air exiting the heat storage device 27 with the normal temperature air flowing in the upstream side duct 49 on the inlet side of the white smoke prevention blower 19. Since the temperature of the air sent to the prevention air heater 3 is raised, white smoke prevention is performed to prevent the low temperature corrosion of the white smoke prevention air heater 3 as in the waste incineration facility shown in FIGS. The duct for returning the heated air on the outlet side of the air heater 3 to the inlet side of the white smoke prevention blower 19 can be omitted.

Next, a conventional intermittent operation type waste incineration facility (hereinafter referred to as a conventional system) of the same scale and an intermittent operation type waste incineration facility using the heat recovery utilization system 8 of the present invention (hereinafter referred to as the present system). Compare fuel consumption at start-up.
The scale of the conventional system and the present system is assumed to be able to incinerate about 3 tons of waste per hour and operate for 8 hours per day.

Table 1 below shows that kerosene was burned with 10,000 m ³ N at normal temperature (combustion of starter burner 9 and leakage into the furnace) in a conventional system, and burned at 400 ° C. after 1.5 hours. A trial calculation example for the case of obtaining exhaust gas is shown, and the case where air that changes from 200 ° C. to 50 ° C. is used for obtaining the same amount of combustion exhaust gas in this system is shown for comparison. . The lower calorific value of kerosene was 34.1 MJ / L.

Based on the results shown in Table 1, the time variation of the air temperature, the amount of air, and the amount of kerosene used at the time of startup of the furnace is shown in a graph as shown in FIGS.
When the kerosene consumption at the time of start-up is calculated from the graph of FIG. 8 (calculated by the area of the graph), the conventional system uses 242L of kerosene, whereas in this system, the kerosene used is 180L, and the kerosene is about It can be reduced by 25%.

  In addition, the necessary heat storage amount in this system is 2802 MJ including the heat radiation of the heat storage device 27, and is 1 of the waste heat input during steady operation (heat generation amount 10 MJ / kg, waste treatment amount 3 t / h, operation time 6 hours). Corresponds to .56%. If the exhaust gas temperature at the inlet of the heat storage air heater 26 is 350 ° C., the exhaust gas temperature at the outlet of the heat storage air heater 26 is 337.5 ° C. Therefore, even when the white smoke prevention air heater 3 is installed at the subsequent stage of the heat storage air heater 26, the amount of heat necessary for white smoke prevention and generation of warm water in the residual heat utilization facility 7 can be sufficiently covered.

Table 2 below compares the amount of combustion exhaust gas from the chimney 6 during steady operation of the above-described conventional system and this system.
The white smoke prevention conditions were an atmospheric temperature of 5 ° C., a relative humidity of 50%, and the amount of heat recovered by the hot water generator 7a of the residual heat utilization equipment 7 was about 180 kW.

As is clear from Table 2, in this system, the amount of exhaust gas after mixing with air for preventing white smoke (the amount of exhaust gas on the inlet side of the chimney 6) is 2370 m ³ _N / h (3. 6%), and the diameter of the chimney 6 can be reduced by 30 mm (1.9%).
Furthermore, when the heat storage adjustment line is used in combination, and the amount of heat equal to the required amount of heat is released to the atmosphere, these effects become greater. Specifically, the amount of exhaust gas is reduced by 4750 m ³ _{N /} h (7.2%), and the diameter of the chimney 6 can be reduced by 60 mm (3.8%).

  1, 4 and 5, the intermittent operation type incineration facility shown in FIG. 1, FIG. 4 and FIG. 5 collects heat from the combustion exhaust gas during operation of the incinerator 1, stores this heat, and starts the incinerator 1. The combustion air supplied to the starter burner 9 and the air under the stalker supplied under the stalker are sometimes heated by using the heat stored, but in other embodiments, they are illustrated. However, when the intermittent operation type incineration facility is stopped, room temperature air is heated through the heat storage device 27 of the heat recovery and utilization system 8, and the heated air is installed in another facility other than the waste incineration facility (for example, , A hot water supply device, a heating device, etc.) may be used as a heat source for external heat supply.

For example, a waste incineration facility is operated for 24 hours on weekdays to store heat in the heat storage device 27 of the heat recovery utilization system 8, and the heat storage device 27 of the heat recovery utilization system 8 is used as a heat source for external heat supply on the weekend when the waste incineration facility is stopped. The air heated by the heat storage device 27 may be used by supplying it to a device (hot water supply device, heating device, etc.) in another facility other than the waste incineration facility.
In this way, it is possible to effectively use the recovered heat when the waste incineration facility is stopped.

  Further, in the intermittent operation type incineration facility shown in FIG. 5, when the incinerator 1 is started, the air circulation switching supply device 28 is switched to heat normal temperature air through the heat storage device 27, and this heating is performed. However, in another embodiment, when the incinerator 1 is started up, the heat storage device is supplied to the start-up burner 9 of the incinerator 1 and used as the combustion air of the start-up burner 9. The air heated through 27 may be supplied to the starter burner 9 of the incinerator 1 and the stoker of the incinerator 1, respectively, and used as the combustion air and the air under the stoker of the starter burner.

  The present invention is applied to an intermittent operation type waste incineration facility that incinerates waste such as municipal waste. However, the present invention can be applied to other facilities as long as it emits combustion exhaust gas. For example, the present invention can be applied to an intermittently operated fuel combustion facility in which fuel is burned to generate power.

  1 is an incinerator, 3 is an air heater for preventing white smoke, 8 is a heat recovery system, 9 is a starter burner, 12 is a stoker, 26 is an air heater for heat storage, 27 is a heat storage device, and 28 is an air circulation switching supply Device 33 is a steam accumulator.

Claims (9)

  A heat storage air heater that heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air is installed in the flue through which the combustion exhaust gas discharged from the incinerator of the intermittent operation type waste incineration facility flows. A heat storage device that collects heat from the air heated by the heat storage air heater and stores the heat is provided outside the flue, and at least room temperature air and heating air are appropriately supplied to at least the heat storage air heater, the heat storage device, and the incinerator. A heat recovery and utilization method for an intermittently operated waste incineration facility in which an air circulation switching supply device that can be supplied to the heat storage device is connected and the heat stored in the heat storage device is used as a heat source at least when the incinerator is started. During operation of the furnace, normal temperature air is circulated between the heat storage air heater and the heat storage device by the air circulation switching supply device, and the heat of the air heated by the heat storage air heater is stored in the heat storage device, Also, When starting up the incinerator, the air circulation switching supply device is switched to heat normal temperature air through the heat storage device without passing it through the heat storage air heater, and this heated air is supplied to the starter burner of the incinerator. A method for recovering heat from an intermittently operated waste incineration facility, characterized in that it is used as combustion air for a starter burner.   A heat storage air heater that heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air is installed in the flue through which the combustion exhaust gas discharged from the incinerator of the intermittent operation type waste incineration facility flows. A heat storage device that collects heat from the air heated by the heat storage air heater and stores the heat is provided outside the flue, and at least room temperature air and heating air are appropriately supplied to at least the heat storage air heater, the heat storage device, and the incinerator. A heat recovery and utilization method for an intermittently operated waste incineration facility in which an air circulation switching supply device that can be supplied to the heat storage device is connected and the heat stored in the heat storage device is used as a heat source at least when the incinerator is started. During operation of the furnace, normal temperature air is circulated between the heat storage air heater and the heat storage device by the air circulation switching supply device, and the heat of the air heated by the heat storage air heater is stored in the heat storage device, Also, When the incinerator is started, the air circulation switching supply device is switched to heat the room temperature air through the heat storage device without passing through the heat storage air heater, and this heated air is supplied to the incinerator start burner and the incinerator. A heat recovery and utilization method for an intermittently operated waste incineration facility, which is supplied under the stoker and used as combustion air for the start burner and air under the stoker.   A heat storage air heater that heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air is installed in the flue through which the combustion exhaust gas discharged from the incinerator of the intermittent operation type waste incineration facility flows. A heat storage device for recovering and storing heat from the air heated by the heat storage air heater is provided outside the flue, and at least the heat storage air heater and the air heater for preventing white smoke after the heat storage air heater An intermittent operation in which an air circulation switching supply device capable of appropriately supplying normal temperature air and heated air is connected to the heat storage device and the incinerator, and the heat stored in the heat storage device is used as a heat source at least when the incinerator is started. This is a heat recovery and utilization method for a waste incineration facility, and during operation of the incinerator, normal temperature air is passed through a white smoke prevention air heater, a heat storage air heater and a heat storage device by an air circulation switching supply device. Heat storage The heat of the air heated by the air heater is stored in the heat storage device, and the air that has passed through the heat storage device is returned to the white smoke prevention air heater and the heat storage air heater. The circulation switching supply device is switched to heat normal temperature air through a heat storage device, and this heated air is supplied to the starter burner of the incinerator and used as combustion air for the starter burner. The method of heat recovery and use of an intermittent operation type incineration facility.   When the intermittent operation type waste incineration facility is not in operation, the air circulation switching supply device heats room temperature air through the heat storage device, and supplies this heated air to devices in other facilities other than the waste incineration facility for external heat supply. 4. The method for recovering and using heat in an intermittent operation type waste incineration facility according to claim 1, wherein the heat recovery method is used as a heat source.   Intermittent operation type that recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and has been subjected to temperature reduction, and stores this heat as a heat source at least when the facility is started A heat recovery and utilization system for a waste incineration facility, wherein the heat recovery and utilization system is provided in a flue through which reduced temperature combustion exhaust gas flows, and heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air A heat storage air heater, a heat storage device that is provided outside the flue and collects heat from the air heated by the heat storage air heater and stores the heat, and at least the heat storage air heater, the heat storage device, and the incinerator Connected, normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the taken-in normal temperature air is not passed through the heat storage air heater and heated through the heat storage device. Intermittent operation heat recovery and utilization system of waste incinerators, characterized in that it is composed of an air circulation switching supply device capable of supplying to the start burner in the incinerator.   Intermittent operation type that recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and has been subjected to temperature reduction, and stores this heat as a heat source at least when the facility is started A heat recovery and utilization system for a waste incineration facility, wherein the heat recovery and utilization system is provided in a flue through which reduced temperature combustion exhaust gas flows, and heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air A heat storage air heater, a heat storage device that is provided outside the flue and collects heat from the air heated by the heat storage air heater and stores the heat, and at least the heat storage air heater, the heat storage device, and the incinerator Connected, normal temperature air can be circulated between the heat storage air heater and the heat storage device, and the taken-in normal temperature air is not passed through the heat storage air heater and heated through the heat storage device. Heat recovery and utilization system of intermittent operation type of waste incineration facilities, characterized in that it is composed of an air circulation switching supply device capable of supplying to both under stoker startup burner and incinerator incinerator.   Intermittent operation type that recovers heat from the combustion exhaust gas discharged from the incinerator of the intermittent operation type incineration facility and has been subjected to temperature reduction, and stores this heat as a heat source at least when the facility is started A heat recovery and utilization system for a waste incineration facility, wherein the heat recovery and utilization system is provided in a flue through which reduced temperature combustion exhaust gas flows, and heats room temperature air by indirect heat exchange between the combustion exhaust gas and room temperature air A heat storage air heater, a heat storage device that is provided outside the flue and collects heat from the air heated by the heat storage air heater to store heat, and at least the heat storage air heater and the heat storage air heater It was connected to the air heater for preventing white smoke, the heat storage device and the incinerator installed in the latter stage, and the room temperature air was heated by the heat storage device through the air heater for heat storage, the air heater for preventing white smoke and the heat storage device. Air circulation switching supply device that can return the air to the white smoke prevention air heater and the heat storage air heater, and supply the normal temperature air that has been taken in through the heat storage device to at least the incinerator start-up burner A heat recovery and utilization system for an intermittent operation incineration facility characterized by comprising   8. The heat recovery and utilization system for an intermittent operation type waste incineration facility according to claim 5, wherein the heat storage device comprises an exhaust heat recovery boiler with a brackish water drum.   The heat storage device is connected to the exhaust heat recovery boiler with the brackish water drum and the exhaust heat recovery boiler with the brackish water drum and can store heat from the exhaust heat recovery boiler with the brackish water drum and heat to the exhaust heat recovery 7 recovery boiler with the brackish water drum A heat recovery and utilization system for an intermittent operation type waste incineration facility according to claim 5, wherein the system is a steam accumulator capable of supplying a steam accumulator.

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