JP2008543547A - Combined dryer, wet sludge incineration apparatus with combined dryer, and method thereof - Google Patents

Abstract

Disclosed is a waste processing apparatus and method, particularly a wet sludge processing method and apparatus.
The reaction chamber is divided into two combined dryers and a wet sludge incineration processing method and apparatus equipped with a combined dryer, the wet sludge is heated by two heat carriers, and the wet sludge is dried in the dryer. Direct heat exchange with one heat carrier and indirect heat exchange with another heat carrier. The wet sludge is in a fluid state during the drying process and is sufficiently heated by the two heat carriers. Moisture is evaporated from the wet sludge and discharged from the dryer along with the fluidized gas in the form of water vapor. Both the dried sludge and the carrier directly heat exchanged are discharged from the combined dryer and further sent to a circulating fluidized bed incinerator. The wet sludge having a moisture content of 60 to 90% is dried and incinerated in a circulating fluidized bed incinerator or a circulating fluidized bed boiler. Wet sludge is dried and incinerated in a single unit. After the wet sludge is dried in the combined dryer, it is returned to the furnace along with the circulating ash, incinerated, and a large amount of moisture contained in the wet sludge. Does not enter the end-point flue gas with the high-temperature flue gas, but is withdrawn with the fluidizing gas of the composite dryer, reducing the heat loss of the system. The composite dryer is provided with a heat dissipating coil and communicates with a pipe heat exchanger in the exhaust gas at the end portion. The flue gas from the furnace is used as a heat source for drying wet sludge together with the high-temperature circulating ash, and the heat remaining in the incinerator is fully utilized.
[Selection] Figure 1

Description

  The present invention relates to a waste treatment apparatus and treatment method, and more particularly to a wet sludge treatment method and apparatus.

  Sludge is a solid residue after sewage treatment, and the amount of sludge occupies about 3 ‰ to 5 ‰ (with a water content of 97%) of the sewage treatment amount. The amount of industrial and domestic sewage treatment in Japan is increasing rapidly, and a lot of sludge is generated by continually building sewage treatment plants. The components of sludge are very complex and contain a large amount of water, and also contain components such as ordinary organic matter, persistent organic matter, multiple trace elements, pathogenic microorganisms, parasite eggs, and heavy metals. .

  The sludge treatment method using incineration as the core technology can satisfy the demands of weight reduction, stabilization, and detoxification to the maximum. However, most of the conventional sludge incineration methods are performed in advance after pretreatment such as drying sludge using specialized equipment in advance, and drying and incineration are completed in two facilities. This complicates the system. The energy consumption of the drying equipment is large, the operation cost is high, and the demand for safety is high. If the dried sludge is easily incinerated, NOx is likely to be generated, so a denitrification device must be installed after the incinerator. Moreover, since sulfur is contained in the sludge, a desulfurization apparatus must also be arranged after incineration. Thus, the sludge incineration system becomes complicated, and the detoxification processing cost increases.

  When wet sludge that has not been dried is directly added to the incinerator and incinerated, unit processes such as sludge drying and incineration, and smoke detoxification treatment can be collected and performed simultaneously in a single device. The treatment process can be simplified and the treatment cost can be reduced, but the moisture contained in the wet sludge is discharged from the incineration chamber along with the high-temperature flue gas generated by incineration, and a large amount of heat is lost. It will be necessary to achieve the energy balance by adding fuel.

  The present invention heats wet sludge with two heat carriers in a composite dryer, and directly exchanges heat with wet heat sludge with one type of heat carrier and indirectly heat exchange with other types of heat carrier. The wet sludge is heated efficiently and appropriately by the heat of the two heat carriers, the moisture of the wet sludge is evaporated and dried, and the evaporated moisture is dried together with the fluidized gas in the form of water vapor. It is an object of the present invention to provide a combined dryer in which both the sludge discharged and dried and the heat carrier for direct heat exchange are discharged from the combined dryer.

  The present invention further combines drying and incineration of sludge organically and collecting them in an integrated device, and the heat required to dry the wet sludge is released during the combustion of sludge and auxiliary fuel. Provides a circulating fluidized bed wet sludge drying and incineration treatment method with a combined dryer that incinerates the dried sludge supplied directly from the heat generated, preferably from the residual heat recovered from the flue gas, in the incineration chamber The purpose is to do.

  The present invention further combines drying and incineration of sludge organically and collecting them in an integrated device, and the heat required to dry the wet sludge is released during the combustion of sludge and auxiliary fuel. Providing a circulating fluidized bed wet sludge drying and incineration treatment equipment with a combined dryer that incinerates dried sludge supplied directly from the heat generated, preferably from the residual heat recovered from the flue gas, in the incineration chamber The third purpose is to do.

  The embodiment of the present invention is as follows.

  A gas dispersion plate 620 is horizontally attached to the lower portion of the inner chamber, a vent hole 621 is provided on the gas dispersion plate 620, and the chamber below the gas dispersion plate 620 includes a chamber 600 that is a fluidized air chamber 622.

  A vertical air guide partition plate 606 fixed to the chamber bottom wall and both side chamber walls of the chamber 600 is provided at a lower portion inside the chamber 600. The air guide partition plate 606 divides the lower part of the chamber in the longitudinal direction into a bubble fluidized bed type direct heat exchange chamber 602 and a bubble fluidized bed type indirect heat exchange chamber 603, and heat is added inside the indirect heat exchange chamber 603. A heat dissipating coil 608 filled with an exchange medium is disposed. A wet sludge inlet 609 is provided in the ceiling lid of the direct heat exchange chamber 602, a thermal ash inlet 630 is provided in the lower end wall or the outer wall, and an exhaust port 610 is provided in the ceiling lid and outer wall of the indirect heat exchange chamber 603, respectively. And a dry sludge outlet 611 is provided.

  The fluid wind chamber 622 is divided into two parts on the left and right, and corresponds to the direct heat exchange chamber 602 and the indirect heat exchange chamber 603, respectively. The upper end of the air guide partition plate 606 is slightly higher than the upper end of the heat dissipation coil 608. The thermal ash inlet 630 is located on the lower end wall or the outer wall of the direct heat exchange chamber 602, and the inlet shape is circular, rectangular or square, and the number is 1 to 3, and the total of its diameter or width is directly The ratio with the width of the heat exchange chamber 602 is 0.1-1. The wet sludge inlet 609 is positioned on the side of the ceiling lid of the direct heat exchange chamber 602 that is biased toward the hot ash inlet 630. The exhaust port 610 is located on the side of the ceiling lid of the indirect heat exchange chamber 603 that is biased toward the dry sludge outlet 611. The dry sludge outlet 611 is located in the middle of the outer wall of the indirect heat exchange chamber 603 and is equal in height to the top of the heat dissipating coil 608, and the ratio of its width to the width of the indirect heat exchange chamber 603 is 0.5 to 1. It is. The heat dissipating coil 608 is arranged in the longitudinal direction of the chamber (that is, the direction of hot ash flow), and the heat medium passed through the heat dissipating coil 608 is heat conduction oil or steam. The fluidization speed of the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is 0.3 to 0.8 m / s.

  The circulating fluidized bed wet sludge drying incineration method with a composite dryer provided in the present invention incinerates and dries wet sludge having a moisture content of 60 to 90% in a circulating fluidized bed incinerator. Its features are as follows.

  In the circulating fluidized bed high-temperature circulating ash circuit, a combined dryer is installed, and the high-temperature circulating ash separated from the centrifugal separator of the circulating fluidized bed incinerator passes through the thermal ash distribution device, and partly passes through the return device to the furnace. The remaining part returns to the combined dryer. The wet sludge dispersed by the dispersing device is sent to the composite dryer, and is directly mixed with the high-temperature circulating ash in the composite dryer to perform heat exchange, and the heat exchange medium in the heat dissipation coil disposed in the composite dryer Indirect heat exchange and heated, dried to sludge with a moisture content of 5-20%, then returned to the furnace with circulating ash and incinerated. The composite dryer is a bubble fluidized bed type, and a fluidizing gas is passed from the bottom, and a heat dissipation coil is provided therein. The heat dissipating coil communicates with the pipe heat exchanger at the end of the incinerator, and a heat exchanging medium is passed through the heat dissipating coil. The heat exchanging medium absorbs the heat of hot smoke in the pipe heat exchanger. Heat is dissipated in the heat dissipation coil and the wet sludge is heated. The heat exchange medium is a heat conduction oil or steam. The temperature change of heating and heat dissipation of the heat exchange medium is controlled in the range of 100 to 260 ° C. The amount of high-temperature circulating ash to the composite dryer is adjusted by a thermal ash distributor, and the exhaust temperature of the composite dryer is controlled to 80 to 150 ° C. By adjusting the exhaust temperature of the composite dryer using the thermal ash distributor, the inert floor (for example, sand) is added to the circulation circuit to increase the total circulation ash amount. The exhaust gas from the combined dryer is dedusted and dehumidified, and then sent to the combined dryer and circulated as fluidized gas, or sent to a furnace and incinerated.

  A combined dryer is installed in the high-temperature circulating ash circulation circuit of the circulating fluidized bed incinerator, and the high-temperature circulating ash separated from the centrifuge is distributed by the thermal ash distributor, and part of it enters the return device and enters the furnace. Return directly and the rest part enters the combined dryer. The wet sludge having a moisture content of 60 to 90% is dispersed by a dispersing device and then added from a wet sludge inlet provided in the composite dryer. The composite dryer is a bubbling fluidized bed type and allows fluidized gas to pass through the bottom. A heat dissipating coil is disposed therein, and the heat exchange medium absorbs the heat of hot flue gas in the pipe heat exchanger, dissipates heat in the heat dissipating coil, and heats the wet sludge. The heat exchange medium is a heat transfer oil or steam. Wet sludge is heated and dried by the heat of flue gas generated by the heat exchange medium in the heat dissipation coil, but the heat in this part is insufficient to dry the wet sludge to a moisture content of 5 to 20%. Supplement with hot circulating ash.

  Adjusting the amount of high-temperature circulating ash to the combined dryer using a thermal ash distribution device, controlling the exhaust temperature of the combined dryer to 80 to 150 ° C, supplying sufficient heat to make the moisture content of wet sludge 5 to 20% Until dry. The thermal ash distribution device may be mechanical or pneumatic. In addition, by adding inert flooring (for example, sand) to the circulation circuit and increasing the total circulation ash amount, the adjustment range of the thermal ash distribution device is increased and the adjustment capability for the exhaust temperature of the composite dryer is strengthened. To do. The wet sludge is mixed directly with the circulating ash in the composite dryer, performs indirect heat exchange with the heat dissipation coil, is heated, the contained moisture is evaporated, and dried to a sludge with a moisture content of 5-20%, Returned to the incinerator with the circulating ash by mechanical transport method or pneumatic method and incinerated.

  Most of the moisture contained in the wet sludge is evaporated in the composite dryer and is drawn from the top of the composite dryer with the fluidizing gas of the composite dryer. As for the exhaust of the composite dryer, fine powder and dust are separated by a fine powder separator, condensed water is condensed by a cooler, pressurized by a blower, and sent to the composite dryer as fluidized gas of the composite dryer. And recycled, or sent to a furnace and incinerated. Fine powder and dust separated from the fine powder separator are sent to a furnace by a mechanical transport system or pneumatic system and incinerated, and condensed water condensed by a cooler is sent to a sewage treatment plant for processing.

  The wet sludge incineration treatment apparatus with a composite dryer provided in the present invention includes a furnace 1 of a circulating fluidized bed incinerator, a high-temperature gas solid separator 2, a flue 3 at the end, a thermal ash distribution device 4, A sludge disperser 5, a composite dryer 6, a fine powder separator 71, a cooler 72, a dryer / exhaust treatment system 7 comprising a steam / water separator 73 and a blower 74, and equipped with the composite dryer The features of the wet sludge incineration treatment device are as follows.

  The hot ash distributor 4 is located below the high temperature gas solid separator 2, and the inlet and the legs 21 of the high temperature gas solid separator are in communication with each other, and the outlets are the furnace 1 and the composite dryer 6 of the incinerator, respectively. The specific structure is as follows.

  Directly below the legs 21 of the hot gas solid separator, an upright flow dividing plate 402 is provided, and on both sides of the upright flow dividing plate 402, the upper part is communicated and the bottom surface is positioned at the same level height. A first supply chamber 403 and a second supply chamber 405 of the thermal ash distribution device are provided, and the upright flow dividing plate 402 is provided on the bottom surface of the first supply chamber 403 and the second supply chamber 405 of the leg portion 21 of the separator. Divide the projection into two parts.

  Furthermore, a first passage chamber 404 and a second passage chamber 406 are provided, and a first overflow port 407 and a second overflow port are provided above the first passage chamber 404 and the second passage chamber 406, respectively. 408 is provided, and the bottom ends of the first overflow port 407 and the second overflow port 408 are located at the same level height.

  The bottom of the first supply chamber 403 and the first delivery chamber 404 are communicated with each other through a first horizontal hole 409, and the first delivery chamber 404 has an upper portion through a first overflow port 407 and an incinerator furnace. Communicate with 1. The bottoms of the second supply chamber 405 and the second delivery chamber 406 are communicated with each other through a second horizontal hole 410. The first horizontal holes 409 and the second horizontal holes 410 are located at the same level at their top ends. The top end of the upright flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and is not higher than the bottom end of the first overflow port 407. The first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are all provided with a gas dispersion plate with a vent on the bottom surface, below the gas dispersion plate, Wind chambers corresponding to the first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are provided, and a fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The first air supply chamber 404 and the second air supply chamber 406 are communicated with each other through a balanced blower tube 401.

  The composite dryer 6 is communicated with the thermal ash distribution device 4 through the second overflow port 408, and its specific structure is as follows.

  In the composite dryer 6, an upright inlet partition plate 605 and an air guide partition plate 606 which are parallel to each other are provided. The inlet partition plate 605 is located at a location approaching the second overflow port 408 of the thermal ash distribution device 4 in the composite dryer 6, and the wind guide partition plate 606 is located in the middle of the composite dryer 6. Both divide the interior of the composite dryer 6 into an inlet chamber 601, a direct heat exchange chamber 602, and an indirect heat exchange chamber 603. The upper part of the inlet chamber 601 and the second overflow port 408 communicate with each other, the inlet chamber 601 and the direct heat exchange chamber 602 are separated by an inlet partition plate 605, and both of them communicate with each other at the bottom. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are separated by an air guide partition plate 606, and both of them communicate with each other at the top. The inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 are each provided with a gas dispersion plate with a vent on the bottom, and the inlet chamber 601 and the direct heat exchange chamber are respectively provided below the gas dispersion plate. A wind chamber corresponding to 602 and the indirect heat exchange chamber 603 is provided, and fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The fluidized gas in the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas or a flue gas of a cooled incinerator, and the fluidization speed is 0.4 to 1.5 m / s.

  A wet sludge inlet 609 is provided at a location close to the inlet chamber 601 at the top of the direct heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the inlet chamber 601 at the top of the indirect heat exchange chamber 603. A heat dissipating coil 608 is disposed in the indirect heat exchange chamber 603, and the upper end of the air guide partition plate 606 is slightly higher than the upper end of the heat dissipating coil 608 so as not to damage the heat dissipating coil 608. The heat dissipation coil 608 and the pipe heat exchanger 31 in the end flue 3 are communicated, and the heat dissipation medium is filled in the heat dissipation coil 608 and the pipe heat exchanger 31. The sludge disperser 5 is a mechanical or pneumatic sludge disperser and communicates with the composite dryer 6 through a wet sludge inlet 609.

  A dry sludge outlet 611 and an exhaust outlet 610 are provided on one side away from the second overflow port 408 of the composite dryer 6, and the dry sludge outlet 611 is connected via a dry sludge return device 612 or a first spiral feeder 613. And communicated with the furnace 1 of the incinerator.

  The exhaust treatment system 7 of the dryer is communicated with the composite dryer 6 through the exhaust port 610 of the composite dryer 6. The fine powder outlet of the fine powder separator 71 of the exhaust treatment system 7 of the dryer is communicated with the furnace 1 of the incinerator via the fine powder return device 711 or the second spiral feeder 712 and separated from the exhaust gas of the dryer. Return the sludge fine powder to furnace 1 of the incinerator.

  The dry sludge outlet 611 is provided on a side wall away from the second overflow port 408 of the composite dryer 6, and the bottom end thereof and the bottom end of the second overflow port 408 have the same height, and the dry sludge return device By connecting 612 and the furnace 1 of the incinerator, the dried sludge and the cooled circulating ash are both sent to the furnace 1 of the incinerator via the dry sludge return device 612.

  The dry sludge outlet 611 is provided at one end away from the inlet chamber 601 on the bottom surface of the indirect heat exchange chamber 603 of the composite dryer 6, communicated with the furnace 1 of the incinerator via the first spiral feeder 613, and dried. Both the sludge and the cooled circulating ash are sent to the furnace 1 of the incinerator through the first spiral feeder 613.

  In the indirect heat exchange chamber 603 of the composite dryer 6, an outlet partition plate 607 parallel to the inlet partition plate 605 is provided, the outlet chamber 604 is partitioned, and a gas distribution with vent holes is formed on the bottom surface of the outlet chamber 604. A plate is provided, and a wind chamber corresponding to the outlet chamber 604 is provided below the gas dispersion plate, and fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The indirect heat exchange chamber 603 and the outlet chamber 604 separated by the outlet partition plate 607 communicate with each other at the bottom. The dry sludge outlet 611 is provided on the side wall of the outlet chamber 604, and the bottom end thereof is equal in height to the bottom end of the second overflow port 408 and communicates with the furnace 1 of the incinerator.

  The ratio of the area of the two portions where the projections on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the leg 21 of the separator are separated by the upright flow dividing plate 402 is 0.25 to 4.0.

  The outlet of the blower 74 of the dryer exhaust treatment system 7 is communicated with the direct heat exchange chamber 602 of the composite dryer 6 and the wind chamber at the bottom of the indirect heat exchange chamber 603 via a fluidizing gas pipe 741.

  The outlet of the blower 74 of the dryer exhaust treatment system 7 is communicated with the furnace 1 of the incinerator via a branch pipe 742. A sand addition port 713 is provided at the inlet of the fine powder return device 711. A sand addition port 713 is provided at the inlet of the second spiral feeder 712.

  The principle of the present invention is as follows.

  The composite dryer of the present invention adds wet sludge dispersed from the top of the direct heat exchange chamber, and is directly mixed with the fluid heat carrier (thermal ash) in the direct heat exchange chamber in the fall process, dried, and manufactured. Be grained. The high-temperature hot ash entering from the bottom is mixed with the hot ash directly in the heat exchange chamber under a fluid state, and heat is directly supplied to the heat exchange chamber. Next, the thermal ash and sludge get over the partition plate under the action of the fluidizing gas, enter the indirect heat exchange chamber, indirect heat exchange with the heat exchange medium in the heat dissipation coil in the indirect heat exchange chamber, and subsequently The dried sludge and the cooled thermal ash are discharged from the dry sludge outlet, and the water evaporated from the wet sludge is discharged from the exhaust port along with the fluidized gas.

  The drying process of wet sludge is carried out in a combined dryer, and heat from the combustion of sludge and auxiliary fuel brought about by high-temperature circulating ash is used, and the exhaust heat from the incinerator is recovered from the flue gas to obtain wet sludge. The wet sludge is dried to granular sludge having a water content of 5 to 20%, and is further returned to the furnace together with the circulating ash and incinerated. High temperature flue gas generated by incineration contains only a small amount of steam, and the heat exhausted from the furnace is greatly reduced. Most of the water in the wet sludge is discharged with the exhaust of the low-temperature combined dryer in the form of steam, and the steam is condensed into water in the cooler and can be sent to a sewage treatment plant for processing, dust removal and The dehumidified composite dryer exhaust can be recycled in a sealed circulation, or sent to a furnace for incineration, and all of which emits an odorous gas generated during sludge drying to the environment. You can avoid that.

  The high-temperature circulating ash separated by the centrifugal separator of the circulating fluidized bed incinerator is distributed by the thermal ash distribution device, a part is returned directly to the furnace, and the remaining part is put into the combined dryer. The wet sludge having a moisture content of 60 to 90% is dispersed by a dispersing device and then added from a wet sludge inlet provided in the composite dryer. The combined dryer is a bubbling fluidized bed type, the fluidizing gas is passed through the bottom, a heat dissipating coil is placed in it, and the heat exchange medium is the heat of the hot flue gas in the pipe heat exchanger in the end flue. Is absorbed, and further heat is radiated in the heat dissipation coil to heat the wet sludge. The heat exchange medium is a heat transfer oil or steam. Heated by the heat of the flue gas brought about by the heat exchange medium in the heat dissipation coil, the wet sludge is dried, but the heat in this part is insufficient to dry the wet sludge to a moisture content of 5 to 20%, The lacking part is supplemented by using hot circulating ash that has been distributed to the combined dryer by the hot ash distributor.

  By adjusting the flow velocity of the 1st supply chamber, 2nd supply chamber, 1st delivery chamber, 2nd delivery chamber of the thermal ash distribution device, the circulating ash can be returned directly to the furnace and directly to the combined dryer. The amount of high-temperature circulating ash entering the combined dryer can be controlled, the exhaust temperature of the combined dryer is controlled to 80 to 150 ° C, and sufficient heat is supplied to make wet sludge moisture content 5 to 20% Can be dried. By adding inert flooring (eg sand) to the circulation circuit and increasing the total amount of circulating ash, the adjustment range of the thermal ash distributor is increased, and the exhaust temperature of the combined dryer is adjusted by the thermal ash distributor. Strength can be strengthened. Wet sludge is directly mixed with circulating ash in a composite dryer, indirect heat exchange with the heat dissipating coil is heated, the contained moisture is evaporated, and the dried sludge has a moisture content of 5-20%. It is dried, sent to the furnace through a return device with circulating ash, and incinerated.

  If the height of the direct return port for hot ash and the return port for dry sludge are not equal, the pressure at the 1st overflow port and the 2nd overflow port are not equal. It is possible to balance the flow resistance required to return directly to the flow and the flow resistance applied to the composite dryer. When the hot ash direct return port is higher than the dry sludge return port, the pressure of the first overflow port is low, and the flow dividing plate separates the projection on the bottom of the first supply chamber and the second supply chamber of the legs of the separator. The ratio of the two areas should be less than 1, otherwise it should be greater than 1.

  Most of the moisture contained in the wet sludge is evaporated in the composite dryer and is drawn from the top of the composite dryer with the fluidizing gas of the composite dryer. In the composite dryer, fine powder and dust are separated by the fine powder separator, condensed water is condensed by the cooler, then pressurized by the blower, and sent to the composite dryer as the fluidizing gas of the composite dryer for circulation. Used, some are sent to the furnace and incinerated. The fine powder and dust separated by the fine powder separator are sent to a furnace by a mechanical transport method or pneumatic method and incinerated, and the condensed water condensed by the cooler is sent to a sewage treatment plant for processing.

  The drying process of wet sludge is carried out in a combined dryer, using the sludge produced by the high-temperature circulating ash and the heat generated by the combustion of the auxiliary fuel, and collecting the waste heat from the incinerator from the flue gas to remove the wet sludge. After drying, wet sludge is dried to granular dried sludge with a moisture content of 5-20%, and then returned to the furnace with circulating ash and incinerated. Only a small amount of steam is present in the high-temperature flue gas generated by incineration. contains. Most of the moisture in the wet sludge is exhausted with the combined dryer exhaust, which is in the form of steam, and the temperature is low, and the steam is condensed into water in the cooler and can be sent to the sewage treatment plant for treatment, dust removal and dehumidification In addition to being able to circulate and use the combined dryer exhaust in a closed circulation, it can also be sent to a furnace for incineration, and all of which discharges a gas with a strange odor that occurs during sludge drying to the environment. Can be avoided.

  The composite dryer of the present invention can be used for drying waste with high water content such as sludge, such as municipal sewage sludge, papermaking sludge, petrochemical industry sludge, etc. It can also be used for concentration drying.

  The circulating fluidized bed wet sludge combined drying incineration processing method and processing apparatus provided in the present invention have the following advantages. Drying and incineration, without requiring a mode to perform each of the two processes independently, organically combining sludge drying and incineration, collecting them in an integrated device, and heat loss due to material cooling and transportation Reduces power consumption, greatly simplifies the drying and incineration process of wet sludge, and simplifies drying and incineration equipment. The heat required to dry the wet sludge is supplied from the heat released by the sludge and auxiliary fuel combustion and the residual heat of the incinerator flue gas. The hot particles and the wet sludge are directly contacted in the composite dryer, mixed well, heat conduction is enhanced, and the wet sludge is heated and dried quickly. At the same time, the wet sludge also performs indirect heat exchange with the heat dissipating coil, absorbs the heat recovered from the hot flue gas brought about by the heat exchange medium, and fully utilizes the residual heat of the incinerator.

  By adopting the method and apparatus of the present invention, the upper limit of the moisture content of wet sludge that can be purely incinerated can be increased by 2 to 3%, and wet sludge with a moisture content of 73 to 75% and lower is supported. It can be incinerated without adding fuel. If the method and apparatus of the present invention is employed for incineration of high moisture content wet sludge that requires the addition of auxiliary fuel, the amount of auxiliary fuel added can be reduced and operating costs can be saved. The circulating fluidized bed incinerator adopts a circulating fluidized combustion system and has NOx production suppression and desulfurization functions. Most of the moisture contained in the wet sludge is not discharged with the high temperature smoke generated by combustion, but is concentrated in the low temperature gas discharged from the combined dryer, thereby reducing the heat loss of the system. It is possible to reduce the consumption amount of auxiliary fuel in the incinerator or raise the upper limit of the wet sludge moisture content in which incineration is performed without adding auxiliary fuel. The gas generated in the drying of the wet sludge is recycled after use or sent to a furnace and incinerated so as not to discharge a gas with a strange odor during the treatment process.

Example 1
The composite dryer of this example includes the following structure.

  In the rectangular parallelepiped chamber 600, a gas dispersion plate (grid plate) 620 provided with a vent hole (nozzle) 621 is attached in a lateral direction at a lower portion inside the chamber. The chamber below the gas dispersion plate 620 becomes a fluid air chamber 622, and a vertical air guide partition plate 606 provided in the chamber divides the chamber into a heat exchange chamber 602 and an indirect heat exchange chamber 603 in the longitudinal direction, Both chambers are also bubbling fluidized beds. The direct heat exchange chamber 602 is provided with a thermal ash inlet 630 and a wet sludge inlet 609, a heat dissipating coil 608 is provided inside the indirect heat exchange chamber 603, and the exhaust port 610 and dry sludge are provided in the chamber 600. An outlet 611 is provided. The fluid wind chamber 622 is divided into two parts, which correspond to the direct heat exchange chamber 602 and the indirect heat exchange chamber 603, respectively. The air guide partition plate 606 is slightly higher than the heat radiation coil 608. The thermal ash inlet 630 is located at one end of the bottom of the direct heat exchange chamber 602 away from the wind guide partition plate 606, and the inlet shape is rectangular and is equal to the width of the direct heat exchange chamber 602. The wet sludge inlet 609 is located on the thermal ash inlet 630 side of the ceiling lid of the direct heat exchange chamber 602 (it may be located between the ceiling lid center line of the direct heat exchange chamber 602 and the outer wall). The exhaust port 610 is located on the dry sludge outlet 611 side of the ceiling cover of the indirect heat exchange chamber 603. The dry sludge outlet 611 is located in the middle of the side of the indirect heat exchange chamber 603 facing the air guide partition plate 603 and is the same as the height of the top of the heat dissipating coil. Is 0.5. The heat dissipating coil 608 is disposed in the longitudinal direction, and heat conduction oil is put therein. The fluidization speed of the direct heat exchange chamber 602 is 0.5 m / s, and the fluidization speed of the indirect heat exchange chamber 603 is 0.4 m / s. The wet sludge is introduced from the wet sludge inlet 609, and the dry sludge is discharged along with the cooled ash cooled from the dry sludge outlet 611.

Example 2
The composite dryer of this example includes the following structure.

  The rectangular parallelepiped chamber 600 has a gas dispersion plate 620 with a vent hole 621 provided in the lower part inside the chamber mounted horizontally, and the chamber under the gas dispersion plate 620 becomes a fluidized air chamber 622, which is a vertical direction provided in the chamber. The wind guide partition plate 606 divides the chamber in the longitudinal direction into a direct heat exchange chamber 602 and an indirect heat exchange chamber 603, both chambers are bubble fluidized beds, and the direct heat exchange chamber 602 has a thermal ash inlet 630 and A wet sludge inlet 609 is provided, a heat dissipating coil 608 is provided inside the indirect heat exchange chamber 603, and an exhaust port 610 and a dry sludge outlet 611 are provided in the chamber 600. The fluid wind chamber 622 is divided into two parts, which correspond to the direct heat exchange chamber 602 and the indirect heat exchange chamber 603, respectively. The air guide partition plate 606 is slightly higher than the heat radiation coil 608. The thermal ash inlet 630 is located at the bottom of the side of the direct heat exchange chamber 602, the inlet shape is circular, the number is two, and the ratio of the sum of their diameters to the width of the direct heat exchange chamber 602 is 0.4. It is. The wet sludge inlet 609 is located on the thermal ash inlet 630 side of the ceiling lid of the direct heat exchange chamber 602. The exhaust port 610 is located on the dry sludge outlet 611 side of the ceiling cover of the indirect heat exchange chamber 603. The dry sludge outlet 611 is located in the middle of the side of the indirect heat exchange chamber 603 facing the air guide partition plate 606, and has the same height as the top of the heat dissipation coil, and the ratio of its width to the width of the indirect heat exchange chamber. Is 1. The heat dissipating coil 608 is disposed in the longitudinal direction and puts steam into the inside thereof. The fluidization speed of the direct heat exchange chamber 602 is 0.3 m / s, and the fluidization speed of the indirect heat exchange chamber 603 is 0.8 m / s. The permeate in the landfill is added from the wet sludge inlet 609, and the dried permeate residue is discharged along with the cooled ash cooled from the dry sludge outlet 611.

Example 3
In the circulating fluidized bed incinerator, wet sludge A having a moisture content of 60% is incinerated and dried, and when wet sludge A is added from the wet sludge inlet 609 provided on the composite dryer 6, and added, The sludge is dispersed by the sludge dispersion device 5 attached to the wet sludge inlet 609. The combined dryer 6 is provided in the circulating ash circulation circuit of the circulating fluidized bed incinerator, and the high-temperature circulating ash separated by the centrifuge 2 passes through the mechanical thermal ash distribution device 41 and partly returns. 42 enters and returns directly to the furnace 1, and the remaining part enters the combined dryer 6. The composite dryer 6 is a bubble fluidized bed type, and a fluidizing gas is passed through the bottom, and a heat dissipating coil 608 is provided therein. The heat dissipating coil 608 and the pipe heat exchanger 31 in the end flue 3 of the incinerator are connected to each other, and the heat exchange medium G (steam) is generated by the combustion exhausted in the pipe heat exchanger 31. Heat is absorbed, heated to 150 ° C., further dissipated in the heat dissipation coil 608, wet sludge is heated, and the steam is cooled to 100 ° C. Add sand from the bottom of furnace 1 to increase the total circulation volume, adjust the high-temperature circulating ash volume to the combined dryer 6 with the thermal ash distributor 41, and control the temperature of the exhaust C of the combined dryer to about 80 ° C. To do. Wet sludge A is directly mixed with circulating ash in the combined dryer 6 and heated, the contained moisture evaporates, and wet sludge A is dried to sludge B with a moisture content of 20%, pneumatic It returns to furnace 1 with the circulating ash by the method and is incinerated. Exhaust air C of the combined dryer is drawn from the top, dust D is separated by the fine powder separator 71, condensed water E is condensed by the cooler 72, and then pressurized by the blower 74 to fluidize the composite dryer. It is sent to the composite dryer 6 as gas and used in circulation. The dust D separated by the fine powder separator 71 is sent to the furnace 1, incinerated, and the condensed water E condensed by the cooler 72 is sent to the sewage treatment plant for processing.

Example 4
In the circulating fluidized bed incinerator, coal is added as an auxiliary fuel, wet sludge A with a moisture content of 90% is incinerated and dried, and wet sludge A is removed from the wet sludge inlet 609 provided on the combined dryer 6. In addition, when adding, the sludge is dispersed by the sludge dispersal device 5 attached to the wet sludge inlet 609. The combined dryer 6 is provided in the circulating ash circulation circuit of the circulating fluidized bed incinerator, and the high-temperature circulating ash separated by the centrifugal separator 2 passes through the pneumatically controlled thermal ash distribution device 41 and partly It enters the return device 42 and returns directly to the furnace 1, and the remaining part enters the combined dryer 6. The composite dryer 6 is a bubble fluidized bed type, and a fluidizing gas is passed through the bottom, and a heat dissipation coil 608 is provided in the composite dryer 6. The heat dissipating coil 608 and the pipe heat exchanger 31 in the end flue 3 of the incinerator are connected to each other, and the heat exchange medium G (heat conduction oil) is taken away in the pipe heat exchanger 31. The heat generated by the combustion is absorbed and heated to 260 ° C., further radiated in the heat dissipating coil 608, the wet sludge is heated, and the heat conduction oil is cooled to 220 ° C. The amount of high-temperature circulating ash to the composite dryer 6 is adjusted by the thermal ash distributor 41, and the temperature of the exhaust C of the composite dryer is controlled to about 150 ° C. The wet sludge A is directly mixed with the circulating ash in the combined dryer 6 and heated, the contained moisture evaporates, and the wet sludge A is dried to sludge B with a moisture content of 15% and transported by machine. It returns to furnace 1 with the circulating ash by the method and is incinerated. The exhaust C of the combined dryer is drawn from the top, and the dust D is separated by the fine powder separator 71, condensed to the condensed water E by the cooler 72, pressurized by the blower 74, returned to the furnace 1, and incinerated. Is done. The dust D separated by the fine powder separator 71 is sent to the furnace 1, and the condensed water E condensed by the cooler 72 is sent to the sewage treatment plant for processing.

Example 5
FIG. 7 and FIG. 8 are structural schematic diagrams of the present embodiment, and as shown in the figure, the wet sludge incineration treatment apparatus with a composite dryer of the present embodiment includes a furnace 1 of a circulating fluidized bed incinerator. , High temperature gas solid separator 2, end flue 3, thermal ash distributor 4, sludge disperser 5, composite dryer 6, dryer exhaust treatment system 7 (fine powder separator 71, cooling Machine 72, steam / water separator 73, blower 74, etc.).

  The thermal ash distribution device 4 is located below the separator 2, the inlet is connected to the legs 21 of the separator, and the outlets are connected to the furnace 1 and the combined dryer 6 of the incinerator, respectively. The structure is as follows.

  Directly below the legs 21 of the separator, an upright flow dividing plate 402 is provided, and on both sides thereof, a first supply chamber 403 and a second supply chamber 405 of a thermal ash distribution device are provided, respectively. Are communicated, the bottom surface is located at the same level height, and the upright flow dividing plate 402 divides the projection on the bottom surfaces of both chambers of the leg 21 of the separator into two parts. Furthermore, a first passage chamber 404 and a second passage chamber 406 are provided, and a first overflow port 407 and a second overflow port are provided above the first passage chamber 404 and the second passage chamber 406, respectively. 408 is provided.

  The bottom of the first supply chamber 403 and the first delivery chamber 404 are communicated with each other through a first horizontal hole 409, and the first delivery chamber 404 has an upper portion through the first overflow port 407 and the furnace 1 of the incinerator. Communicated with The bottom of the second supply chamber 405 and the second transmission chamber 406 are communicated with each other through the second horizontal hole 410, and the second supply chamber 406 is provided with a second overflow port 408 at the top. The first overflow port 407 and the second overflow port 408 have their bottom ends positioned at the same level. The top ends of the first horizontal hole 409 and the second horizontal hole 410 are located at the same level. The first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are all provided with a gas dispersion plate with a vent hole on the bottom surface. Below, air chambers corresponding to the first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are provided, respectively, and fluidized gas whose flow rate can be adjusted is provided in the wind chamber. Pass through. The first air supply chamber 404 and the second air supply chamber 406 are communicated with each other by a balanced blower tube 401.

  The top end of the upright flow dividing plate 402 and the bottom end of the first overflow port 407 have the same height. The upright flow dividing plate 402 has a ratio of the area of the two parts divided on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the leg 21 of the separator to 0.25.

  The second overflow port 408 of the thermal ash distributor 4 and the composite dryer 6 are in communication with each other, and the specific structure of the composite dryer 6 is as follows.

  In the composite dryer 6, an upright inlet partition plate 605 and a wind guide partition plate 606 are provided, and both are parallel to each other. The inlet partition plate 605 is located at the second overflow port 408 close to the thermal ash distribution device 4 in the composite dryer 6, and the air guide partition plate 606 is located in the middle of the composite dryer 6, both of which are combined. The interior of the dryer 6 is divided into an inlet chamber 601, a direct heat exchange chamber 602, and an indirect heat exchange chamber 603. The upper part of the second overflow port 408 and the inlet 601 communicate with each other, the inlet chamber 601 and the direct heat exchange chamber 602 are separated by the inlet partition plate 605, and the bottoms of both are communicated. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are partitioned by a wind guide partition plate 606, and the upper portions of both are communicated. The inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 are each provided with a gas dispersion plate with a vent on the bottom surface, and the inlet chamber 601 and direct heat exchange are respectively below the gas dispersion plate. A wind chamber corresponding to the chamber 602 and the indirect heat exchange chamber 603 is provided, and a fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The fluidizing gas in the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas, and the fluidization speed is 0.4 m / s. A wet sludge inlet 609 is provided at a location close to the inlet chamber 601 at the top of the direct heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the inlet chamber 601 at the top of the indirect heat exchange chamber 603. A heat dissipating coil 608 is disposed inside the indirect heat exchange chamber 603, and the upper end of the air guide partition plate 606 is slightly higher than the upper end of the heat dissipating coil 608. The heat radiation coil 608 and the pipe heat exchanger 31 in the terminal flue 3 are communicated, and the heat radiation medium is filled in the heat radiation coil 608 and the pipe heat exchanger 31.

  The wet sludge inlet 609 of the composite dryer 6 is provided with a mechanical sludge dispersion device 5 above, and the dispersed sludge falls directly into the composite dryer 6.

  A dry sludge outlet 611 is provided on a side wall away from the second overflow port 408 of the composite dryer 6, and the bottom end of the dry sludge outlet 611 and the bottom end of the second overflow port 408 have the same height. The dry sludge outlet 611 communicates with the furnace 1 of the incinerator by the dry sludge return machine 612, and the sludge dried by the dry sludge return machine 612 and the circulating ash after cooling are returned to the furnace 1 of the incinerator.

  The exhaust port 610 of the combined dryer is communicated with the exhaust treatment system 7 of the dryer, and the outlet of the blower 74 of the exhaust processing system 7 of the dryer is connected to the direct heat exchange chamber of the combined dryer 6 through a fluidized gas pipe. 602 communicates with the wind chamber at the bottom of the indirect heat exchange chamber 603, and the branch pipe 742 communicates with the furnace 1 of the incinerator.

  The fine powder outlet of the fine powder separator 71 communicates with the furnace 1 of the incinerator via the fine powder return machine 711, and the sludge fine powder separated from the exhaust gas of the dryer is sent to the furnace 1 of the incinerator. A sand addition port 713 is provided at the inlet of the fine powder return machine 711, and sand is added during operation to improve the transport characteristics and fluidization characteristics of the sludge fine powder.

Example 6
FIG. 9 and FIG. 10 are structural schematic diagrams of the present embodiment, and as shown in the figure, the wet sludge incineration apparatus with a composite dryer of the present embodiment includes a furnace 1 of a circulating fluidized bed incinerator. , High-temperature gas-solid separator 2, flue 3 at the end, thermal ash distributor 4, sludge disperser 5, composite dryer 6, and exhaust treatment system 7 for the dryer (fine powder separator 71, A cooler 72, a steam / water separator 73, a blower 74, etc.).

  The thermal ash distribution device 4 is located below the separator 2, the inlet is connected to the legs 21 of the separator, and the outlets are connected to the furnace 1 and the combined dryer 6 of the incinerator, respectively. The basic structure is as follows.

  Directly below the legs 21 of the separator, an upright flow dividing plate 402 is provided, and on both sides thereof, a first supply chamber 403 and a second supply chamber 405 of a thermal ash distribution device are provided, respectively. Are communicated, the bottom surface is located at the same level height, and the upright flow dividing plate 402 divides the projection on the bottom surfaces of both chambers of the leg 21 of the separator into two parts. Furthermore, a first passage chamber 404 and a second passage chamber 406 are provided, and a first overflow port 407 and a second overflow port are provided above the first passage chamber 404 and the second passage chamber 406, respectively. 408 is provided.

  The bottom of the first supply chamber 403 and the first delivery chamber 404 are communicated with each other through a first horizontal hole 409, and the first delivery chamber 404 has an upper portion through the first overflow port 407 and the furnace 1 of the incinerator. Communicated by The bottoms of the second supply chamber 405 and the second delivery chamber 406 are communicated by the second horizontal hole 410, and the second supply chamber 406 is provided with a second overflow port 408 at the top. The first overflow port 407 and the second overflow port 408 have their bottom ends positioned at the same level. The top ends of the first horizontal hole 409 and the second horizontal hole 410 are located at the same level. The first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are all provided with a gas dispersion plate with a vent on the bottom surface, below the gas dispersion plate. Are provided with wind chambers corresponding to the first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406, respectively, and the flowable fluidized gas is passed through the wind chamber. . The first air supply chamber 404 and the second air supply chamber 406 are communicated with each other by a balanced blower tube 401. The top end of the flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and is not higher than the bottom end of the first overflow port 407. The flow dividing plate 402 bisects the projected areas on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the leg 21 of the separator.

  The second overflow port 408 of the thermal ash distributor 4 and the composite dryer 6 are in communication with each other, and the specific structure of the composite dryer 6 is as follows.

  In the composite dryer 6, an upright inlet partition plate 605 and a wind guide partition plate 606 are provided, and both are parallel to each other. The inlet partition plate 605 is located at the second overflow port 408 close to the thermal ash distribution device 4 in the composite dryer 6, and the air guide partition plate 606 is located in the middle of the composite dryer 6, both of which are combined. The interior of the dryer 6 is divided into an inlet chamber 601, a direct heat exchange chamber 602, and an indirect heat exchange chamber 603. The upper part of the second overflow port 408 and the inlet 601 communicate with each other, the inlet chamber 601 and the direct heat exchange chamber 602 are separated by the inlet partition plate 605, and the bottoms of both are communicated. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are separated by an air guide partition plate 606, and the upper portions of both are communicated. The inlet chamber 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 are each provided with a gas dispersion plate with a vent on the bottom, and the inlet chamber 601 and the direct heat exchange chamber are respectively provided below the gas dispersion plate. A wind chamber corresponding to 602 and the indirect heat exchange chamber 603 is provided, and a fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The fluidizing gas in the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is an inert gas, and the fluidization speed is 0.8 m / s. A wet sludge inlet 609 is provided at a location close to the inlet chamber 601 at the top of the direct heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the inlet chamber 601 at the top of the indirect heat exchange chamber 603. A heat dissipating coil 608 is disposed inside the indirect heat exchange chamber 603, and the upper end of the air guide partition plate 606 is slightly higher than the upper end of the heat dissipating coil 608. The heat radiation coil 608 and the pipe heat exchanger 31 in the end flue 3 are communicated with each other, and the heat exchange medium is filled in the heat radiation coil 608 and the pipe heat exchanger 31.

  The wet sludge inlet 609 of the composite dryer 6 is provided with a pneumatic sludge dispersion device 5 above, and the dispersed sludge falls directly into the composite dryer 6.

  A dry sludge outlet 611 is provided at one end away from the inlet chamber 601 on the bottom surface of the indirect heat exchange chamber 603 of the composite dryer 6, and is connected to the furnace 1 of the incinerator via the first spiral feeder 613 for drying. The sludge and the cooled circulating ash are sent together with the first spiral feeder 613 to the furnace 1 of the incinerator.

  The exhaust port 610 of the combined dryer is communicated with the exhaust treatment system 7 of the dryer, and the outlet of the blower 74 of the dryer exhaust processing system 7 directly exchanges heat of the combined dryer 6 via the fluidized gas pipe 741. The chamber 602 communicates with the wind chamber at the bottom of the indirect heat exchange chamber 603.

  The fine powder outlet of the fine powder cyclone 71 communicates with the furnace 1 of the incinerator through the fine powder return machine 711, and the sludge fine powder separated from the exhaust gas of the dryer is sent to the furnace 1 of the incinerator.

Example 7
FIG. 11 and FIG. 12 are structural schematic diagrams of the present embodiment, and as shown in the figure, the wet sludge incineration apparatus with a composite dryer of the present embodiment includes a furnace 1 of a circulating fluidized bed incinerator. , High-temperature gas-solid separator 2, flue 3 at the end, thermal ash distributor 4, sludge disperser 5, composite dryer 6, and exhaust treatment system 7 for the dryer (fine powder separator 71, A cooler 72, a steam / water separator 73, a blower 74, etc.).

  The thermal ash distribution device 4 is located below the separator 2, the inlet is connected to the legs 21 of the separator, and the outlets are connected to the furnace 1 and the combined dryer 6 of the incinerator, respectively. The structure is as follows.

  Directly below the legs 21 of the separator, an upright flow dividing plate 402 is provided, and on both sides thereof, a first supply chamber 403 and a second supply chamber 405 of a thermal ash distribution device are provided, respectively. Are communicated, the bottom surface is located at the same level height, and the upright flow dividing plate 402 divides the projection on the bottom surfaces of both chambers of the leg 21 of the separator into two parts. Furthermore, a first passage chamber 404 and a second passage chamber 406 are provided, and a first overflow port 407 and a second overflow port are provided above the first passage chamber 404 and the second passage chamber 406, respectively. 408 is provided.

  The bottom of the first supply chamber 403 and the first delivery chamber 404 are communicated with each other through a first horizontal hole 409, and the first delivery chamber 404 has an upper portion through the first overflow port 407 and the furnace 1 of the incinerator. Communicated with The bottoms of the second supply chamber 405 and the second delivery chamber 406 are communicated by the second horizontal hole 410, and the second supply chamber 406 is provided with a second overflow port 408 at the top. The first overflow port 407 and the second overflow port 408 have their bottom ends positioned at the same level. The top ends of the first horizontal hole 409 and the second horizontal hole 410 are located at the same level. The first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406 are all provided with a gas dispersion plate with a vent on the bottom surface, below the gas dispersion plate. Are provided with wind chambers corresponding to the first delivery chamber 404, the first supply chamber 403, the second supply chamber 405, and the second delivery chamber 406, respectively, and the flowable fluidized gas is passed through the wind chamber. . The first air supply chamber 404 and the second air supply chamber 406 are communicated with each other by a balanced blower tube 401. The top end of the flow dividing plate 402 is not lower than the top end of the first horizontal hole 409 and is not higher than the bottom end of the first overflow port 407. The flow dividing plate 402 bisects the projected areas on the bottom surfaces of the first supply chamber 403 and the second supply chamber 405 of the leg 21 of the separator.

  The second overflow port 408 of the thermal ash distribution device 4 communicates with the composite dryer 6, and the specific structure of the composite dryer 6 is as follows.

  In the composite dryer 6, an upright inlet partition plate 605 and a wind guide partition plate 606 are provided, and both are parallel to each other. The inlet partition plate 605 is located at the second overflow port 408 close to the thermal ash distribution device 4 in the composite dryer 6, and the air guide partition plate 606 is located in the middle of the composite dryer 6, both of which are combined. The interior of the dryer 6 is divided into an inlet chamber 601, a direct heat exchange chamber 602, and an indirect heat exchange chamber 603. The upper part of the second overflow port 408 and the inlet 601 communicate with each other, the inlet chamber 601 and the direct heat exchange chamber 602 are separated by the inlet partition plate 605, and the bottoms of both are communicated. The direct heat exchange chamber 602 and the indirect heat exchange chamber 603 are partitioned by a wind guide partition plate 606, and the upper portions of both are communicated. The inlet 601, the direct heat exchange chamber 602, and the indirect heat exchange chamber 603 are all provided with a gas dispersion plate with a vent on the bottom surface, and the inlet chamber 601 and the direct heat exchange chamber are respectively provided below the gas dispersion plate. A wind chamber corresponding to 602 and the indirect heat exchange chamber 603 is provided, and a fluidized gas whose flow rate can be adjusted is passed through the wind chamber. The fluidizing gas in the direct heat exchange chamber 602 and the indirect heat exchange chamber 603 is a cooled incinerator gas, and the fluidization speed is 1.5 m / s. A wet sludge inlet 609 is provided at a location close to the inlet chamber 601 at the top of the direct heat exchange chamber 602, and an exhaust port 610 is provided at a location away from the inlet chamber 601 at the top of the indirect heat exchange chamber 603. A heat dissipating coil 608 is disposed inside the indirect heat exchange chamber 603, and the upper end of the air guide partition plate 606 is slightly higher than the upper end of the heat dissipating coil 608. The heat radiation coil 608 and the pipe heat exchanger 31 in the terminal flue 3 are communicated, and the heat radiation medium is filled in the heat radiation coil 608 and the pipe heat exchanger 31.

  The wet sludge inlet 609 of the composite dryer 6 is provided with a mechanical sludge dispersion device 5 above, and the dispersed sludge falls directly into the composite dryer 6.

  On one side corresponding to the inlet chamber 601 in the composite dryer 6, an outlet partition plate 607 parallel to the inlet partition plate 605 is provided to form an outlet chamber 604, the bottom surface of which is a gas distribution plate with vent holes. Yes, the lower part corresponds to the wind chamber, and the flowable fluidized gas is passed. The indirect heat exchange chamber 603 and the outlet chamber 604 are separated by an outlet partition plate 607, and the bottoms of both are communicated. A dry sludge outlet 611 is provided on the side wall of the outlet chamber 604, and the bottom end of the dry sludge outlet 611 and the bottom end of the second overflow port 408 have the same height. The dry sludge outlet 611 is connected to the furnace 1 of the incinerator.

  The exhaust port 610 of the combined dryer is communicated with the exhaust treatment system 7 of the dryer, and the outlet of the blower 74 of the dryer exhaust processing system 7 is connected to the direct heat exchange chamber of the combined dryer 6 via the fluidized gas pipe 741. 602 communicates with the wind chamber at the bottom of the indirect heat exchange chamber 603, and the branch pipe 742 communicates with the furnace 1 of the incinerator.

  The fine powder outlet of the fine powder separator 71 communicates with the furnace 1 of the incinerator via the second spiral feeder 712, and the sludge fine powder separated from the exhaust of the dryer is sent to the furnace 1 of the incinerator. . A sand addition port 713 is provided at the inlet of the second spiral feeder 712, and sand is added during operation to improve the transport characteristics and fluidization characteristics of sludge fine powder.

1 is a front view of a composite dryer according to a first embodiment of the present invention. 1 is a cross-sectional view of a composite dryer of Example 1 of the present invention. It is a front view of the composite dryer of Example 2 of the present invention. FIG. 3 is a cross-sectional view of a composite dryer according to Example 2 of the present invention. It is a schematic diagram of the circulating fluidized bed wet sludge drying incineration processing method with a composite dryer of Example 3 of the present invention. It is a schematic diagram of the circulating fluidized bed wet sludge drying incineration processing method with a composite dryer of Example 4 of the present invention. It is a schematic diagram of the circulating fluidized bed wet sludge drying incineration processing apparatus with a composite dryer of Example 5 of the present invention. FIG. 6 is a schematic diagram of a thermal ash distribution device and a composite dryer according to Example 5 of the present invention. It is a schematic diagram of the circulating fluidized bed wet sludge drying incineration processing apparatus with a composite dryer of Example 6 of the present invention. It is a schematic diagram of the thermal ash distribution apparatus and composite dryer of Example 6 of the present invention. It is a schematic diagram of the circulating fluidized bed wet sludge drying incineration processing apparatus with a composite dryer of Example 7 of the present invention. It is a schematic diagram of the thermal ash distribution apparatus and composite dryer of Example 7 of the present invention.

Claims (43)

With chamber (600)
A vertical air guide partition plate (606) fixed to a bottom wall and both side walls of the chamber (600) is provided at a lower portion inside the chamber (600),
The wind guide partition plate (606) divides the lower part of the chamber into a bubble fluidized bed direct heat exchange chamber (602) and a bubble fluidized bed indirect heat exchange chamber (603),
Inside the indirect heat exchange chamber (603), a heat dissipating coil (608) filled with a heat exchange medium is disposed,
On the direct heat exchange chamber (602) side, a wet sludge inlet (609) and a thermal ash inlet (630) are provided,
A combined dryer characterized in that a dry sludge outlet (611) and an exhaust port (610) are provided on the indirect heat exchange chamber (603) side.   The chamber (600) is a rectangular parallelepiped, and the vertical air guide partition plate (606) has a lower part of the chamber in the longitudinal direction of the chamber (600) and the direct heat exchange chamber (602) and the indirect heat exchange chamber. The combined dryer according to claim 1, wherein the combined dryer is divided into (603). The composite dryer according to claim 1, wherein an upper end of the wind guide partition plate (606) is slightly higher than an upper end of the heat dissipating coil (608). The combined dryer according to claim 1, wherein the thermal ash inlet (630) is located at a bottom wall of the direct heat exchange chamber (602) or a bottom of the outer wall. The number of the thermal ash inlets (630) is 1 to 3, and the ratio of the total diameter or width to the width of the direct heat exchange chamber (602) is 0.1 to 1. Item 3. The combined dryer according to Item 2. The combined dryer according to claim 1, wherein the wet sludge inlet (609) is located on a side of the ceiling cover of the direct heat exchange chamber (602) away from the indirect heat exchange chamber (603). The combined dryer according to claim 1, wherein the exhaust port (610) is located on a side of the indirect heat exchange chamber (603) away from the direct heat exchange chamber (602). The combined dryer according to claim 1, wherein the dry sludge outlet (611) is located on an outer wall or a bottom wall of the indirect heat exchange chamber (603). The dry sludge outlet (611) is located in the middle of the outer wall of the indirect heat exchange chamber (603) and is equal to the height of the top of the heat dissipating coil (608), and its width and the width of the indirect heat exchange chamber (603). The composite dryer according to claim 2, wherein the ratio is from 0.5 to 1. The heat dissipating coil (608) is disposed in the longitudinal direction of the chamber, that is, in the flow direction of the heat ash, and the heat exchange medium filled in the heat dissipating coil (608) is heat conduction oil or steam. The composite dryer according to claim 1. The combined dryer according to claim 1, wherein the direct heat exchange chamber (602) and the indirect heat exchange chamber (603) have a fluidization speed of 0.3 to 0.8 m / s or 0.4 to 1.5 m / s. . The direct heat exchange chamber (602) is provided with an inlet partition plate (605) spaced from the outer wall, and an inlet chamber (601) is formed between the inlet partition plate (605) and the outer wall, and the inlet chamber The combined dryer according to claim 1, wherein the bottom of the direct heat exchange chamber (602) communicates with the thermal ash inlet (630) in the inlet chamber (601). The indirect heat exchange chamber (603) is provided with an outlet partition plate (607) spaced from the outer wall, and an outlet chamber (604) is formed between the outlet partition plate (607) and the outer wall, and the outlet chamber The combined dryer according to claim 1, wherein the indirect heat exchange chamber and the indirect heat exchange chamber (603) communicate with each other at the bottom, and the dry sludge outlet (611) is provided in the outlet chamber (604). In a circulating fluidized bed incinerator or circulating fluidized bed boiler, wet sludge is incinerated and dried, and in the circulating fluidized bed high-temperature circulating ash circuit, a bubble fluidized bed direct heat exchange chamber and a bubble fluidized bed indirect heat exchange chamber The high-temperature circulating ash separated from the centrifugal separator of the circulating fluidized bed incinerator is distributed by the thermal ash distribution device, and a part is returned to the furnace of the circulating fluidized bed incinerator. And the wet sludge is sent to the composite dryer and mixed directly with the high-temperature circulating ash in the composite dryer, and the heat exchange medium in the heat dissipation coil placed in the composite dryer. A circulating fluidized bed wet sludge drying incineration treatment method in which indirect heat exchange is performed, heated and dried, then returned to the circulating fluidized bed incinerator with circulating ash, and incinerated. The wet sludge has a moisture content of 60 to 90%, and the wet sludge is dried to a sludge having a moisture content of 5 to 20% in a combined dryer, and further, the furnace of a circulating fluidized bed incinerator together with circulating ash. 15. The circulating fluidized bed wet sludge drying and incineration processing method according to claim 14, wherein the incineration processing method is returned to the above and incinerated. The heat dissipating coil is connected to a pipe heat exchanger in the flue at the end of the incinerator, the heat dissipating coil and the pipe heat exchanger are filled with a heat exchanging medium, and the heat exchanging medium is a pipe heat exchanger. 15. The circulating fluidized bed wet sludge drying and incineration treatment method according to claim 14, wherein the heat of the flue gas is absorbed in the vessel, the heat is dissipated in the heat dissipation coil, and the wet sludge is heated. 17. The circulating fluidized bed wet sludge drying and incineration processing method according to claim 14 or 16, wherein a temperature change of heating and heat radiation of the heat exchange medium is controlled in a range of 100 to 260 ° C. 15. The circulating fluidized bed wet sludge drying according to claim 14, wherein the amount of the high-temperature circulating ash adjusted by the thermal ash distributor and entering the composite dryer controls the exhaust temperature of the composite dryer to 80 to 150 ° C. Incineration method. 15. The exhaust gas from the combined dryer is subjected to dust removal and dehumidification, and then sent to the combined dryer and circulated as a fluidized gas, or sent to an incinerator and incinerated. Circulating fluidized bed wet sludge drying incineration processing method. A circulating fluidized-bed incinerator (1) and a high-temperature gas-solid separator (2) connected at the top;
A combined dryer (6) according to claim 1,
Located below the hot gas solid separator (2), the inlet was connected to the legs (21) of the hot gas solid separator, and the outlet was connected to the hot ash inlet (630) of the combined dryer (6) A thermal ash distributor (4),
A wet sludge burning treatment apparatus, wherein a dry sludge outlet (611) of the combined dryer (6) and a furnace (1) of the incinerator are communicated with each other. 21. The wet sludge incineration apparatus according to claim 20, wherein the thermal ash distribution apparatus (4) further includes an outlet communicating with a furnace (1) of an incinerator. Further, the upper part is provided with a terminal flue (3) communicating with the upper part of the hot gas solid separator (2), and the heat dissipating coil (608) of the combined dryer (6) is connected to the terminal flue (3). 21. The wet sludge incineration apparatus according to claim 20, wherein the wet sludge incineration apparatus is in communication with a pipe-type heat exchanger (31) therein. 21. The apparatus according to claim 20, further comprising an exhaust treatment system (7) for the dryer, wherein an exhaust port (610) of the combined dryer (6) is connected to the exhaust treatment system (7) for the dryer. The described wet sludge incineration processing equipment.   The dryer exhaust treatment system (7) includes a fine powder separator (71), a cooler (72), a steam / water separator (73), and a blower (74) communicated with each other, The fine powder outlet of the fine powder separator (71) communicates with the furnace (1) of the incinerator via the fine powder return machine (711) or the second spiral feeder (712) and is separated from the exhaust of the dryer. 24. The wet sludge incineration apparatus according to claim 23, wherein the sludge fine powder is sent to a furnace (1) of an incinerator.   21. The wet sludge incineration apparatus according to claim 20, further comprising a sludge dispersion device (5) communicating with the composite dryer (6) via a wet sludge inlet (609).   In the thermal ash distribution device (4), an upright diverting plate (402) is provided immediately below the leg (21) of the hot gas solid separator, and the upright diverting plate (402) is provided at the upper side on both sides. A first supply chamber (403) and a second supply chamber (405) communicating with each other are provided. In the thermal ash distribution device (4), a first supply chamber (404) and a second supply chamber (406) are further provided. ), And a first overflow port (407) and a second overflow port (408) are provided at the top of the first transmission chamber (404) and the second transmission chamber (406), respectively, The bottoms of the first supply chamber (403) and the first delivery chamber (404) communicate with each other via the first horizontal hole (409), and the second supply chamber (405) and the second delivery chamber (406) 23. The wet sludge incineration apparatus according to claim 21, wherein the bottom part communicates with the second horizontal hole (410).   In the thermal ash distribution device (4), the upper part of the first delivery chamber (404) communicates with the furnace (1) of the incinerator via the first overflow port (407), and the second overflow port 27. The wet sludge incinerator according to claim 26, wherein the (408) communicates with the hot ash inlet (630) of the combined dryer (6).   27. The wet sludge according to claim 26, wherein the bottom surfaces of the first supply chamber (403) and the second supply chamber (405) are positioned at the same level in the thermal ash distribution device (4). Incineration equipment.   27. In the thermal ash distribution device (4), bottom ends of the first overflow port (407) and the second overflow port (408) are located at the same level height. The described wet sludge incineration processing equipment.   27. Wet according to claim 26, wherein in the thermal ash distribution device (4), the top ends of the first horizontal hole (409) and the second horizontal hole (410) are located at the same level height. Sludge incineration equipment.   In the thermal ash distributor (4), the top end of the upright flow dividing plate (402) is not lower than the top end of the first horizontal hole (409) and is not higher than the bottom end of the first overflow port (407). 27. The wet sludge incineration processing apparatus according to claim 26.   In the thermal ash distribution device (4), the first delivery chamber (404), the first supply chamber (403), the second supply chamber (405), and the second delivery chamber (406) are: In each case, a gas dispersion plate with a vent hole is provided on the bottom surface, and the first delivery chamber (404), the first supply chamber (403), the second supply chamber (405), the second are disposed below the gas dispersion plate, respectively. 27. The wet sludge incineration apparatus according to claim 26, wherein a wind chamber corresponding to the two-passage chamber (406) is provided, and a flowable air whose flow rate is adjustable is passed through the wind chamber.   The thermal ash distribution device (4) is characterized in that it is communicated by a balanced wind pipe (401) between the first delivery chamber (404) and the second delivery chamber (406). 26. A wet sludge incineration treatment apparatus.   In the thermal ash distribution device (4), the upright flow dividing plate (402) is projected on the bottom surfaces of the first supply chamber (403) and the second supply chamber (405) of the leg (21) of the separator. 27. The wet sludge incineration treatment apparatus according to claim 26, wherein the two parts are divided and the ratio of the two areas is 0.25 to 4.0.   In the composite dryer (6), an upright inlet partition plate (605) parallel to the air guide partition plate (606) is provided, and the inlet partition plate (605) is connected to the thermal ash distributor (4). Located near the second overflow port (408), the interior of the combined dryer (6) is divided into an inlet chamber (601), and the inlet chamber (601) and the direct heat exchange chamber (602) It is divided by a partition plate (605), both of which communicate with the bottom, and a gas distribution plate with a vent hole is provided on the bottom surface of the inlet chamber (601), and the inlet chamber (601) is provided below the gas distribution plate. 27. The wet sludge incineration apparatus according to claim 26, wherein a corresponding wind chamber is provided, and fluidized gas whose flow rate is adjustable is passed through the wind chamber.   The dry sludge outlet (611) is provided on the side wall away from the hot ash inlet (630) of the combined dryer (6), and the bottom end of the second sludge outlet (408) Equally, the dry sludge return device (612) and the incinerator furnace (1) communicate with each other so that both the dried sludge and the cooled circulating ash pass through the dry sludge return device (612). 27. The wet sludge incineration apparatus according to claim 26, wherein the apparatus is sent to (1) and incinerated.   The dry sludge outlet (611) is provided at one end of the bottom of the indirect heat exchange chamber (603) of the combined dryer (6) away from the thermal ash inlet (630) and incinerated with the first spiral feeder (613). By connecting the furnace furnace (1), the dried sludge and the cooled circulating ash are both sent to the incinerator furnace (1) via the first spiral feeder (613). 21. The wet sludge incineration processing apparatus according to claim 20. In the indirect heat exchange chamber (603) of the composite dryer (6), an outlet partition plate (607) parallel to the air guide partition plate (606) is provided, and the outlet chamber (604) is partitioned, and the outlet chamber (604) is provided with a gas dispersion plate with a vent on the bottom surface, and a gas chamber corresponding to the outlet chamber (604) is provided below the gas distribution plate, and the fluidizing gas whose flow rate can be adjusted in the wind chamber. The outlet chamber (604) and the indirect heat exchange chamber (603) separated by the outlet partition plate (607) communicate with each other at the bottom, and the dry sludge outlet (611) is connected to the outlet chamber (604). Provided on the side wall, the bottom end of the dry sludge outlet (611) and the bottom end of the second overflow outlet (408) are equal in height, and the dry sludge outlet (611) is connected to the furnace (1) of the incinerator. 27. The wet sludge incineration apparatus according to claim 26, wherein the apparatus is communicated.   The outlet of the blower (74) of the exhaust system (7) of the dryer is connected to the direct heat exchange chamber (602) and the indirect heat exchange chamber (603) of the combined dryer (6) via a fluidized gas pipe (741). 25. The wet sludge incineration processing apparatus according to claim 24, wherein the wind chamber is communicated with a wind chamber at the bottom of the apparatus.   25. The wet sludge incineration process according to claim 24, wherein an outlet of the blower (74) of the exhaust treatment system (7) of the dryer is communicated with a furnace (1) of an incinerator by a branch pipe (742). apparatus.   25. The wet sludge incineration apparatus according to claim 24, wherein a sand addition port (713) is provided at an inlet of the fine powder return device (711).   25. The wet sludge incineration apparatus according to claim 24, wherein the sand addition port (713) is provided at an inlet of the second spiral feeder (712). 21. The wet sludge incineration process according to claim 20, wherein the fluidized gas in the direct heat exchange chamber (602) and the indirect heat exchange chamber (603) is an inert gas or a flue gas of a cooled incinerator. apparatus.