CN108800164B - Sludge drying incineration heat balance treatment system and method - Google Patents
Sludge drying incineration heat balance treatment system and method Download PDFInfo
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- CN108800164B CN108800164B CN201810742757.6A CN201810742757A CN108800164B CN 108800164 B CN108800164 B CN 108800164B CN 201810742757 A CN201810742757 A CN 201810742757A CN 108800164 B CN108800164 B CN 108800164B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/10—Drying by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/12—Sludge, slurries or mixtures of liquids
Abstract
The invention provides a sludge drying incineration heat balance treatment system and method, which aim at the problem that sludge with higher water content and lower dry base heat value cannot realize self heat balance in the drying incineration treatment process, cool air is preheated by utilizing a high Wen Chouqi containing water vapor discharged in the sludge drying process, the preheated air is reheated by adopting an auxiliary heating device, and the reheated air is finally subjected to heat exchange with incineration hot flue gas to form hot air, wherein the heat of the hot air is not lower than the heat required by sludge drying. By adopting the sludge drying and incinerating method, the heat balance of sludge drying and incinerating can be realized.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a sludge drying incineration heat balance treatment system and method.
Background
In the process of collecting and disposing urban sewage, a large amount of sludge is inevitably generated, and the sludge has the characteristics of high organic matter content, easy odor generation, high yield and high water content. At present, the main methods for disposing sludge in developed countries are land utilization, sanitary landfill, ocean disposal and sludge drying incineration. Various disposal methods have advantages and disadvantages, and heavy metals and germs in the sludge restrict the sludge land utilization; the sanitary landfill requires a larger landfill space, the yield is high due to high water content of the sludge, and no more sanitary space is used for sanitary landfill; marine disposal is easy to cause marine pollution, threatens the marine ecosystem and human food chains, and is basically not adopted with the stop of the effectiveness of the sludge throwing and discarding protocol to the ocean, which is signed by various countries of the European Union. Sludge drying incineration is widely used in the field of sludge treatment, and is also one of the most effective methods widely used worldwide for thoroughly disposing sludge. The sludge drying incineration method can destroy the tissue structure of the waste at high temperature, eliminate harmful ingredients, quickly and greatly reduce the volume of the waste, recycle energy, and realize the purposes of harmless treatment, reduction and recycling of industrial waste at one time.
The water content of the mechanically dehydrated sludge of a sewage treatment plant in China is more than 80-83%, the content of organic matters is mostly below 60%, the direct incineration of the sludge cannot depend on self heat to maintain the combustion temperature according to the solid content of the sludge and the influence of the content of the organic matters on combustion, and the water content of the sludge is less than 30% to self-sustaining incineration. Drying and incineration are generally considered to be two separate processes, and in fact, it is very difficult to directly incinerate sludge without drying. The heat required by the general sludge drying is large, and according to the property of the current sludge, the heat released by the sludge incineration can not meet the requirements of wet sludge drying, and additional energy is also required to be provided to realize the energy balance of a sludge drying incineration system. Therefore, the heat balance of the subsequent drying and incineration can be ensured by pretreating the sludge, improving the dehydration efficiency of the sludge or improving the dry base heat value of the sludge, but the sludge treatment flow is increased, the treatment cost is increased, and some medicaments are introduced during pretreatment, so that secondary pollution is possibly caused.
Disclosure of Invention
The invention aims at higher water content. The sludge with lower dry base heat value can not realize self heat balance in the drying and incinerating treatment process. The method comprises the steps of preheating cold air by utilizing the high Wen Chouqi containing steam discharged in the sludge drying process, then adopting an auxiliary heating device to reheat the preheated air, and finally exchanging heat between the reheated air and incineration hot flue gas to form hot air, wherein the heat of the hot air is not lower than the heat required by sludge drying. By adopting the sludge drying and incinerating method, the heat balance of sludge drying and incinerating can be realized.
The technical scheme adopted by the invention is as follows:
the sludge drying incineration heat balance treatment system is characterized by comprising a drying device, an incineration device, a preheating device, an auxiliary heating device, a smoke heat exchange device, a smoke purification device and a deodorizing device, wherein the drying device is provided with a drying device feed inlet, a drying device discharge outlet, a drying device air inlet and a drying device odor outlet; the incineration device is provided with an incineration device feed inlet, an incineration device air supplementing port, an incineration device slag outlet and an incineration device flue gas outlet; the preheating device is provided with a preheating device odor inlet, a preheating device odor outlet, a preheating device cold air inlet and a preheating device air outlet; the auxiliary heating device is provided with an auxiliary heating device odor inlet, an auxiliary heating device odor outlet, an auxiliary heating device air inlet and an auxiliary heating device air outlet; the flue gas heat exchange device is provided with a flue gas inlet of the flue gas heat exchange device, a flue gas outlet of the flue gas heat exchange device, an air inlet of the flue gas heat exchange device and a hot air outlet of the flue gas heat exchange device; the discharge port of the drying device is connected with the feed port of the incineration device; the drying device odor outlet is connected with the preheating device odor inlet; the flue gas outlet of the incineration device is connected with the flue gas inlet of the flue gas heat exchange device; the odor outlet of the preheating device is connected with the odor inlet of the auxiliary heating device; the air outlet of the preheating device is connected with the air inlet of the auxiliary heating device; the odor outlet of the auxiliary heating device is connected with the deodorizing device; the auxiliary heating device air outlet is connected with the flue gas heat exchange device air inlet and the incineration device air supplementing port; the flue gas outlet of the flue gas heat exchange device is connected with the flue gas purifying device; the hot air outlet of the flue gas heat exchange device is connected with the air inlet of the drying device; the auxiliary heating device of the sludge drying incineration heat balance treatment system further comprises a condensing tube, an expansion valve, an evaporator and a compressor.
Further, the sludge drying device also comprises a hot air circulating fan which is arranged on an internal circulating pipeline of the sludge drying device.
Further, the method further comprises the following steps: the wet exhausting fan is positioned on a pipeline between the odor outlet of the drying device and the odor inlet of the preheating device; the cold air blower is positioned on a pipeline between the air outlet of the preheating device and the air inlet of the auxiliary heating device; the odor fan is positioned on a pipeline between the odor outlet of the auxiliary heating device and the deodorizing device; the warm air blower is positioned on a pipeline between the air outlet of the auxiliary heating device and the air inlet of the flue gas heat exchange device; the hot air blower is positioned on a pipeline between the hot air outlet of the flue gas heat exchange device and the air inlet of the drying device.
Further, the air conditioner further comprises a valve which is positioned on a pipeline between the warm air blower and the air supplementing port of the incineration device.
Further, the drying device is one of a van dryer, a tunnel dryer, a belt dryer, a drum dryer, an air flow dryer and a fluidized bed dryer.
The sludge drying incineration heat balance treatment method utilizes the sludge drying incineration heat balance treatment system, and comprises the following steps:
(1) conveying wet sludge generated by an urban sewage treatment plant into a drying device, heating the wet sludge in the drying device by heated air, evaporating water in the sludge, generating odor containing water vapor, and forming dried sludge after evaporating the water in the wet sludge;
(2) the odor containing water vapor in the step (1) exchanges heat with cold air in a preheating device, preheated air enters an auxiliary heating device, the primarily cooled odor is taken as a heat source, the preheated odor is heated again, the cooled odor enters a deodorizing device for deodorizing and then is discharged, and a part of the reheated air is taken as the air supplement of an incineration device;
(3) the sludge after the drying treatment in the step (1) is conveyed into an incinerator, hot flue gas and slag are generated through incineration, the slag is discharged out of a furnace body, the hot flue gas exchanges heat with the other part of the reheated air in the step (2) in a flue gas heat exchange device, the hot air after the heat exchange is used as the hot air of the dryer in the step (1), and the cooled flue gas is discharged after being treated by a flue gas purification device.
Further, the power source of the auxiliary heating device of the heat pump in the step (2) is one of electricity, high-temperature steam and fuel gas.
Further, the moisture content of the wet sludge in the step (1) is less than or equal to 85 percent, the moisture content of the dried sludge is less than or equal to 30 percent, and the dry basis low-grade heat value of the wet sludge is more than or equal to 1700kcal/kg.
The beneficial effects of the invention are as follows:
1. the energy is saved, and the sludge incineration treatment cost is reduced. Sludge incineration has been considered as one of the best disposal modes for sludge reduction, harmlessness and recycling, but the high disposal cost limits the application of sludge incineration disposal. Because domestic sludge is mostly low in organic matter content and high in water content, sludge drying or sludge incineration combustion improver accounts for a large proportion in the sludge incineration disposal cost. According to the sludge drying and incinerating heat balance treatment system and method, heat energy in the system is utilized to the maximum extent, the conversion efficiency of the heat energy is improved, cold air is heated for three times and then is used for sludge drying, heat required by sludge drying is met, heat energy balance of the sludge drying and incinerating system is achieved, additional heating is not needed, energy sources are saved, and sludge incineration treatment cost is reduced.
2. The sludge range suitable for sludge incineration treatment is enlarged. The higher the water content of the sludge is, the higher the heat energy required for drying is, and the heat generated by the sludge incineration with high water content or low heating value is less, which are the main factors influencing the heat balance of the sludge drying and incinerating system. In order to realize the heat balance of sludge drying and incineration, a method for improving the sludge dewatering effect and improving the heat productivity of the sludge through pretreatment is considered, so that the treatment flow and the treatment difficulty are increased, but the heat balance of the sludge with the conventional water content (75% -85%) and the conventional heat value (1700-2600 kcal/kg) is insufficient to reach the heat balance with the heat required by drying. The invention heats the cold air once by using the odor of the water vapor with higher temperature generated by drying, increases the temperature of the cold air by 10-20 ℃, heats the preheated air twice by an auxiliary heating device, increases the temperature of the wet air by 10-25 ℃ again, and heats the air three times by flue gas heat exchange. Compared with the direct heat exchange with the flue gas, the air temperature can be increased by 50-90 ℃, and the dry basis low-level heat value of the sludge for incineration can be properly reduced under the condition of maintaining the heat balance of the system, so that the sludge which is suitable for incineration only after further treatment in the past can be directly subjected to incineration treatment, and the range of the sludge suitable for treatment in an incineration mode is enlarged.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a sludge drying incineration heat balance treatment system and method according to the present invention.
In the figure: 1-drying device, 2-incineration device, 3-preheating device, 4-auxiliary heating device, 5-flue gas heat exchange device, 6-flue gas purification device, 7-deodorizing device, 9-valve, 11-drying device feed inlet, 12-drying device discharge outlet, 13-drying device air inlet, 14-drying device odor outlet, 21-incineration device feed inlet, 22-incineration device air supplementing port, 23-incineration device slag outlet, 24-incineration device flue gas outlet, 31-preheating device odor inlet, 32-preheating device odor outlet, 33-preheating device cold air inlet, 34-preheating device air outlet, 41-auxiliary heating device odor inlet, 42-auxiliary heating device odor outlet, 43-auxiliary heating device air inlet, 44-auxiliary heating device air outlet, 45-condenser tube, 46-expansion valve, 47-evaporator, 48-compressor, 51-flue gas heat exchange device odor inlet, 52-flue gas heat exchange device flue gas outlet, 53-flue gas heat exchange device air inlet, 54-flue gas heat exchange device hot air outlet, 81-hot air circulation fan, 82-flue gas heat exchange device air outlet, 82-hot air fan, 83-air fan, 84-wet fan, warm air fan, and air fan.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme adopted by the invention is as follows:
the sludge drying incineration heat balance treatment system is characterized by comprising a drying device, an incineration device, a preheating device, an auxiliary heating device, a smoke heat exchange device, a smoke purification device and a deodorizing device, wherein the drying device is provided with a drying device feed inlet, a drying device discharge outlet, a drying device air inlet and a drying device odor outlet; the incineration device is provided with an incineration device feed inlet, an incineration device air supplementing port, an incineration device slag outlet and an incineration device flue gas outlet; the preheating device is provided with a preheating device odor inlet, a preheating device odor outlet, a preheating device cold air inlet and a preheating device air outlet; the auxiliary heating device is provided with an auxiliary heating device odor inlet, an auxiliary heating device odor outlet, an auxiliary heating device air inlet and an auxiliary heating device air outlet; the flue gas heat exchange device is provided with a flue gas inlet of the flue gas heat exchange device, a flue gas outlet of the flue gas heat exchange device, an air inlet of the flue gas heat exchange device and a hot air outlet of the flue gas heat exchange device; the discharge port of the drying device is connected with the feed port of the incineration device; the drying device odor outlet is connected with the preheating device odor inlet; the flue gas outlet of the incineration device is connected with the flue gas inlet of the flue gas heat exchange device; the odor outlet of the preheating device is connected with the odor inlet of the auxiliary heating device; the air outlet of the preheating device is connected with the air inlet of the auxiliary heating device; the odor outlet of the auxiliary heating device is connected with the deodorizing device; the auxiliary heating device air outlet is connected with the flue gas heat exchange device air inlet and the incineration device air supplementing port; the flue gas outlet of the flue gas heat exchange device is connected with the flue gas purifying device; the hot air outlet of the flue gas heat exchange device is connected with the air inlet of the drying device; the auxiliary heating device of the sludge drying incineration heat balance treatment system further comprises a condensing tube, an expansion valve, an evaporator and a compressor.
Further, the sludge drying device also comprises a hot air circulating fan which is arranged on an internal circulating pipeline of the sludge drying device.
Further, the method further comprises the following steps: the wet exhausting fan is positioned on a pipeline between the odor outlet of the drying device and the odor inlet of the preheating device; the cold air blower is positioned on a pipeline between the air outlet of the preheating device and the air inlet of the auxiliary heating device; the odor fan is positioned on a pipeline between the odor outlet of the auxiliary heating device and the deodorizing device; the warm air blower is positioned on a pipeline between the air outlet of the auxiliary heating device and the air inlet of the flue gas heat exchange device; the hot air blower is positioned on a pipeline between the hot air outlet of the flue gas heat exchange device and the air inlet of the drying device.
Further, the air conditioner further comprises a valve which is positioned on a pipeline between the warm air blower and the air supplementing port of the incineration device.
Further, the drying device is one of a van dryer, a tunnel dryer, a belt dryer, a drum dryer, an air flow dryer and a fluidized bed dryer.
The sludge drying incineration heat balance treatment method utilizes the sludge drying incineration heat balance treatment system, and comprises the following steps:
(1) conveying wet sludge generated by an urban sewage treatment plant into a drying device, heating the wet sludge in the drying device by heated air, evaporating water in the sludge, generating odor containing water vapor, and forming dried sludge after evaporating the water in the wet sludge;
(2) the odor containing water vapor in the step (1) exchanges heat with cold air in a preheating device, preheated air enters an auxiliary heating device, the primarily cooled odor is taken as a heat source, the preheated odor is heated again, the cooled odor enters a deodorizing device for deodorizing and then is discharged, and a part of the reheated air is taken as the air supplement of an incineration device;
(3) the sludge after the drying treatment in the step (1) is conveyed into an incinerator, hot flue gas and slag are generated through incineration, the slag is discharged out of a furnace body, the hot flue gas exchanges heat with the other part of the reheated air in the step (2) in a flue gas heat exchange device, the hot air after the heat exchange is used as the hot air of the dryer in the step (1), and the cooled flue gas is discharged after being treated by a flue gas purification device.
Further, the power source of the auxiliary heating device of the heat pump in the step (2) is one of electricity, high-temperature steam and fuel gas.
Further, the moisture content of the wet sludge in the step (1) is less than or equal to 85 percent, the moisture content of the dried sludge is less than or equal to 30 percent, and the dry basis low-grade heat value of the wet sludge is more than or equal to 1700kcal/kg.
The beneficial effects of the invention are as follows:
1. the energy is saved, and the sludge incineration treatment cost is reduced. Sludge incineration has been considered as one of the best disposal modes for sludge reduction, harmlessness and recycling, but the high disposal cost limits the application of sludge incineration disposal. Because domestic sludge is mostly low in organic matter content and high in water content, sludge drying or sludge incineration combustion improver accounts for a large proportion in the sludge incineration disposal cost. According to the sludge drying and incinerating heat balance treatment system and method, heat energy in the system is utilized to the maximum extent, the conversion efficiency of the heat energy is improved, cold air is heated for three times and then is used for sludge drying, heat required by sludge drying is met, heat energy balance of the sludge drying and incinerating system is achieved, additional heating is not needed, energy sources are saved, and sludge incineration treatment cost is reduced.
2. The sludge range suitable for sludge incineration treatment is enlarged. The higher the water content of the sludge is, the higher the heat energy required for drying is, and the heat generated by the sludge incineration with high water content or low heating value is less, which are the main factors influencing the heat balance of the sludge drying and incinerating system. In order to realize the heat balance of sludge drying and incineration, a method for improving the sludge dewatering effect and improving the heat productivity of the sludge through pretreatment is considered, so that the treatment flow and the treatment difficulty are increased, but the heat balance of the sludge with the conventional water content (75% -85%) and the conventional heat value (1700-2600 kcal/kg) is insufficient to reach the heat balance with the heat required by drying. The invention heats the cold air once by using the odor of the water vapor with higher temperature generated by drying, increases the temperature of the cold air by 10-20 ℃, heats the preheated air twice by an auxiliary heating device, increases the temperature of the wet air by 10-25 ℃ again, and heats the air three times by flue gas heat exchange. Compared with the direct heat exchange with the flue gas, the air temperature can be increased by 50-90 ℃, and the dry basis low-level heat value of the sludge for incineration can be properly reduced under the condition of maintaining the heat balance of the system, so that the sludge which is suitable for incineration only after further treatment in the past can be directly subjected to incineration treatment, and the range of the sludge suitable for treatment in an incineration mode is enlarged.
Example 1
The method comprises the steps of (1) dewatering sludge in a sewage treatment plant, wherein the water content is 85%, the low-level calorific value of a dry basis of the sludge is 3780kcal/kg as determined by an oxygen bomb calorimeter, placing wet sludge in a drying device, and the hot air inlet temperature of the drying device is 200 ℃ and the odor outlet temperature is 75 ℃; the temperature of the preheated air is increased by 20 ℃, the temperature of the air is increased by 25 ℃ after auxiliary heating, the moisture content of the dried sludge is 30%, the dry sludge is burnt, the burnt flue gas exchanges heat with the air at 55 ℃, and the temperature of the hot air after heat exchange is 200 ℃. The heat generated by burning and the heat required by drying can reach heat balance.
Example 2
The dewatered sludge of a sewage treatment plant has the water content of 55%, the lower calorific value of the dry basis of the sludge is 1700kcal/kg as determined by partial oxygen bomb calorimeter, the sludge is burnt, the wet sludge is placed in a drying device, the hot air inlet temperature of the drying device is 120 ℃, and the odor outlet temperature is 55 ℃; the temperature of the preheated air is increased by 10 ℃, the temperature of the air is increased by 25 ℃ after auxiliary heating, the moisture content of the dried sludge is 10%, the dry sludge is burnt, the burnt flue gas exchanges heat with the air at 60 ℃, and the temperature of the hot air after heat exchange is 120 ℃. The heat generated by burning and the heat required by drying can reach heat balance.
Example 3
The water content of dehydrated sludge of a sewage treatment plant is 60%, the low-level calorific value of a dry basis of the sludge is 2500kcal/kg as determined by partial oxygen bomb calorimeter, wet sludge is placed in a drying device, the hot air inlet temperature of the drying device is 200 ℃, and the odor outlet temperature is 70 ℃; the temperature of the preheated air is increased by 20 ℃, the temperature of the air is increased by 25 ℃ after auxiliary heating, the moisture content of the dried sludge is 20%, the dry sludge is burnt, the burnt flue gas exchanges heat with the air at 60 ℃, and the temperature of the hot air after heat exchange is 200 ℃. After the heat generated by incineration is used for sludge drying, 1740kJ/kg of heat remains.
Claims (8)
1. The sludge drying incineration heat balance treatment system is characterized by comprising a drying device (1), an incineration device (2), a preheating device (3), an auxiliary heating device (4), a flue gas heat exchange device (5), a flue gas purification device (6) and a deodorizing device (7), wherein the drying device (1) is provided with a drying device feed inlet (11), a drying device discharge outlet (12), a drying device air inlet (13) and a drying device odor outlet (14); the incineration device (2) is provided with an incineration device feed inlet (21), an incineration device air supplementing port (22), an incineration device slag outlet (23) and an incineration device flue gas outlet (24); the preheating device (3) is provided with a preheating device odor inlet (31), a preheating device odor outlet (32), a preheating device cold air inlet (33) and a preheating device air outlet (34); the auxiliary heating device (4) is provided with an auxiliary heating device odor inlet (41), an auxiliary heating device odor outlet (42), an auxiliary heating device air inlet (43) and an auxiliary heating device air outlet (44); the flue gas heat exchange device (5) is provided with a flue gas inlet (51) of the flue gas heat exchange device, a flue gas outlet (52) of the flue gas heat exchange device, an air inlet (53) of the flue gas heat exchange device and a hot air outlet (54) of the flue gas heat exchange device; the discharge port (12) of the drying device is connected with the feed port (21) of the incineration device; the drying device odor outlet (14) is connected with the preheating device odor inlet (31); the flue gas outlet (24) of the incineration device is connected with the flue gas inlet (51) of the flue gas heat exchange device; the preheating device odor outlet (32) is connected with the auxiliary heating device odor inlet (41); the preheating device air outlet (34) is connected with the auxiliary heating device air inlet (43); the odor outlet (42) of the auxiliary heating device is connected with the deodorizing device (7); the auxiliary heating device air outlet (44) is connected with the flue gas heat exchange device air inlet (53) and the incineration device air supplementing port (22); the flue gas outlet (52) of the flue gas heat exchange device is connected with the flue gas purifying device (6); the hot air outlet (54) of the flue gas heat exchange device is connected with the air inlet (13) of the drying device, and the auxiliary heating device (4) of the sludge drying incineration heat balance treatment system further comprises: a condensing tube (45), an expansion valve (46), an evaporator (47) and a compressor (48).
2. The sludge drying and incinerating heat balance treatment system according to claim 1, further comprising a hot air circulation fan (81) disposed on an inner circulation pipeline of the drying device (1).
3. The sludge drying incineration heat balance treatment system according to claim 1, further comprising: a moisture removal fan (82) positioned on a pipeline between the drying device odor outlet (14) and the preheating device odor inlet (31); a cold air blower (83) located on a pipeline between the preheating device air outlet (34) and the auxiliary heating device air inlet (43); an odor fan (84) which is positioned on a pipeline between the odor outlet (42) of the auxiliary heating device and the deodorizing device (7); a warm air blower (85) which is positioned on a pipeline between the air outlet (44) of the auxiliary heating device and the air inlet (53) of the flue gas heat exchange device; and the hot air blower (86) is positioned on a pipeline between the hot air outlet (54) of the flue gas heat exchange device and the air inlet (13) of the drying device.
4. A sludge drying incineration heat balance treatment system according to claim 3, further comprising a valve (9) located in the pipeline between the warm air blower (85) and the incineration device air supply (22).
5. The sludge drying incineration heat balance treatment system according to claim 1, wherein the drying device (1) is one of a box dryer, a tunnel dryer, a belt dryer, a drum dryer, an air flow dryer and a fluidized bed dryer.
6. A method for sludge drying and incinerating heat balance treatment, which utilizes the sludge drying and incinerating heat balance treatment system as defined in claim 1, and is characterized by comprising the following steps:
(1) conveying wet sludge generated by an urban sewage treatment plant into a drying device (1), heating the wet sludge in the drying device (1) by heated air, evaporating water in the sludge, generating odor containing water vapor, and forming dried sludge after evaporating the water in the wet sludge;
(2) the odor containing water vapor in the step (1) exchanges heat with cold air in the preheating device (3), preheated air enters the auxiliary heating device (4), the primarily cooled odor is taken as a heat source, the preheating device is used for reheating, the cooled odor enters the deodorizing device (7) for deodorizing and then is discharged, and part of the reheated air is taken as the air supplementing of the incineration device (2);
(3) the sludge after the drying treatment in the step (1) is conveyed into an incinerator (2), hot flue gas and slag are generated through incineration, the slag is discharged out of a furnace body, the hot flue gas exchanges heat with the air which is reheated by the other part in the step (2) in a flue gas heat exchange device (5), the hot air after the heat exchange is used as the hot air of the drying device in the step (1), and the cooled flue gas is discharged after being treated by a flue gas purifying device (6).
7. The method for heat balance treatment of sludge drying and incineration according to claim 6, wherein the power source of the auxiliary heating device of the heat pump in the step (2) is one of electricity, high-temperature steam and fuel gas.
8. The method for heat balance treatment of sludge drying and incineration according to claim 6, wherein the moisture content of the wet sludge in the step (1) is less than or equal to 85%, the moisture content of the dried sludge is less than or equal to 30%, and the dry-basis low-heat value of the wet sludge is more than or equal to 1700kcal/kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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