CN110953594B - Multistage dryer and system for treating sludge and recycling energy by fluidized bed incinerator - Google Patents
Multistage dryer and system for treating sludge and recycling energy by fluidized bed incinerator Download PDFInfo
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- CN110953594B CN110953594B CN201911054973.2A CN201911054973A CN110953594B CN 110953594 B CN110953594 B CN 110953594B CN 201911054973 A CN201911054973 A CN 201911054973A CN 110953594 B CN110953594 B CN 110953594B
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- 239000010802 sludge Substances 0.000 title claims abstract description 84
- 238000004064 recycling Methods 0.000 title claims abstract description 12
- 239000012159 carrier gas Substances 0.000 claims abstract description 81
- 239000000428 dust Substances 0.000 claims abstract description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000003345 natural gas Substances 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 64
- 239000003546 flue gas Substances 0.000 claims description 64
- 238000011282 treatment Methods 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 239000002918 waste heat Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- 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
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a system for treating sludge and recycling energy sources by a multi-stage dryer and a fluidized bed incinerator, wherein the system comprises the multi-stage dryer, the fluidized bed incinerator, a primary heater, a circulating fan, a secondary heater, a dust remover, a smoke exhaust heater, a belt dust remover, a deacidification tower, an induced draft fan, a chimney, an auxiliary hot blast stove and a carrier gas temperature regulator. A bypass to the deacidification tower is arranged on an air inlet pipeline of the secondary heater, and a valve is arranged on the bypass to adjust the circulating air carrying capacity. The natural gas inlet end of the auxiliary hot blast stove is provided with a flow control valve, and the natural gas flow is controlled and regulated by a thermometer arranged on the air inlet pipe of the multi-section dryer. The invention adopts the high-efficiency direct multi-stage sludge dryer, the sludge drying efficiency of the whole process is greatly improved, the energy recovery system device can reduce the energy consumption and the cost, and the invention has the advantages of safety, energy conservation and environmental protection.
Description
Technical Field
The invention relates to a multistage dryer and a system for treating sludge and recycling energy by a fluidized bed incinerator, and belongs to the technical field of environmental protection.
Background
After the sludge which is not properly treated enters the environment, secondary pollution is directly brought to the water body and the atmosphere, so that the effective treatment capacity of a sewage treatment system is reduced, and serious threat is formed to the ecological environment and human activities.
At present, the sludge disposal method mainly comprises three steps of landfill, composting agriculture and incineration. The sludge landfill has great waste on land resources, and secondary pollution is easily caused to the environment in the transportation process and the leachate in the landfill; when sludge is composted or compound microbial fertilizer is prepared, heavy metal and harmful substances in the sludge cannot be effectively removed, and heavy metal ions are easy to accumulate in soil and plants, so that the land utilization is limited. The dried sludge can generate 12-20MJ/t of heat energy, is a fuel with low heat value, and the ashes after incineration can not cause secondary pollution. Therefore, in the field of sludge disposal, sludge drying incineration is a technology recommended to be used in national environmental protection at present, has a wider application range, and is suitable for treating municipal sludge with different characteristics in China.
The core equipment of the sludge drying and incinerating process, namely a dryer and an incinerator. The dryer is a semi-dry sludge with the water content of 30% or below generated after drying wet sludge with the water content of 80%, and currently common dryers for treating municipal sludge include a paddle dryer, a fluidized bed dryer, a thin layer dryer and the like. The incinerator is an environment-friendly device which is used for carrying out high-temperature incineration on waste gas, waste liquid and solid waste to achieve reduction, stabilization and harmlessness. At present, the application of the environment-friendly field of the drier and the incinerator is very wide.
At present, the country starts to advocate energy-saving, environment-friendly, energy-saving and emission-reducing technologies. Therefore, effective measures are taken to recycle energy of the sludge drying and incinerating treatment process system, and the method has great significance in improving the energy utilization rate. The existing energy recovery adopts a form that high-temperature flue gas generated by incineration is heated into water vapor by a waste heat boiler, and the water vapor is used as a heat source of a drying system for recycling. By this process, flue gas waste heat can be recovered, but waste heat boiler equipment needs to be added, and the heat recovery rate is relatively low.
At present, a plurality of domestic sludge treatments adopt a sludge drying and incineration treatment process, but the sludge drying treatment process adopts indirect heat exchange, namely water and high-temperature flue gas are subjected to heat exchange to generate water vapor, the water vapor and wet sludge are subjected to indirect heat exchange in a dryer, and the sludge subjected to drying treatment enters an incinerator for treatment. The process has relatively low heat exchange efficiency, and the carrier gas and the high-temperature flue gas exchange heat, and the high-temperature carrier gas is used as a heat source of the dryer to directly exchange heat with the sludge, so that a waste heat boiler is not required, and the investment cost of equipment is reduced.
Disclosure of Invention
In order to improve the energy recycling of the sludge drying and incinerating treatment process, the invention provides a system for treating sludge and recycling energy sources by a multistage dryer and a fluidized bed incinerator, wherein the direct multistage sludge dryer which is in direct contact heat exchange with the sludge by high-efficiency heat carrier gas is adopted, the sludge drying efficiency of the whole process is greatly improved, the heat carrier gas is recycled, the incinerator flue gas is recycled as a heat source for heat treatment, a waste heat boiler is not required, and the equipment investment cost is reduced.
In order to achieve the above object, the technical scheme of the present invention is as follows: a system for treating sludge and recovering energy by a multistage dryer and a fluidized bed incinerator is characterized in that
The system comprises a multi-section dryer, a fluidized bed incinerator, a primary heater, a circulating induced draft fan, a secondary heater, a dust remover, a flue gas reheater, a belt dust remover, a deacidification spray tower, an induced draft fan, a chimney and an auxiliary hot blast stove;
The multi-stage dryer is used for drying the input wet sludge and outputting semi-dry sludge;
the fluidized bed incinerator is connected with the output end of the multi-stage dryer through a pipeline and is used for incinerating the input wet sludge and the semi-dry sludge formed by the multi-stage dryer together;
The primary heater is provided with a flue gas input end, a flue gas output end, a carrier gas input end and a carrier gas output end, wherein the flue gas input end is connected with the flue gas output end of the fluidized bed incinerator through a pipeline, and the carrier gas input end is connected with the carrier gas output end of the multistage dryer through a pipeline;
The lower part of the secondary heater is provided with a smoke input end, a smoke output end, a carrier gas input end and a carrier gas output end, the smoke input end of the secondary heater is connected with the smoke output end of the primary heater through a pipeline, and the carrier gas input end of the secondary heater is connected with the carrier gas output end of the primary heater through a circulating induced draft fan;
The flue gas reheater is provided with a flue gas input end and a flue gas output end, and the flue gas output end of the secondary heater is connected with the flue gas input end of the flue gas reheater through a dust remover;
the flue gas output end of the flue gas reheater is connected to the belt type dust remover through a pipeline;
The flue gas input end of the deacidification spray tower is connected with the flue gas output end of the belt type dust remover;
the flue gas output end of the deacidification spray tower is connected to the chimney through a draught fan;
the auxiliary hot blast stove comprises an air inlet end, a natural gas inlet end and a hot blast output end;
The hot air temperature regulator comprises a carrier gas input end, a carrier gas output end, an auxiliary hot air input end and an auxiliary hot air output end, wherein the auxiliary hot air input end of the hot air temperature regulator is connected with the hot air output end of the auxiliary hot air furnace, the auxiliary hot air output end is connected to a chimney for discharging through a pipeline, the carrier gas input end is connected with the carrier gas output end of the secondary heater through the pipeline, and the carrier gas output end of the hot air temperature regulator is connected to the air inlet end of the multi-section dryer and used for heating sludge of the multi-section dryer.
Further, a bypass to the deacidification spray tower is arranged on the air inlet pipeline of the secondary heater, and a valve is arranged on the bypass and used for adjusting the circulating air carrying capacity.
Further, a flow control valve is arranged at the natural gas inlet end of the auxiliary hot blast stove to control the natural gas flow of the auxiliary hot blast stove, and a thermometer arranged at the air inlet end of the multi-section dryer is used for controlling and adjusting the natural gas flow.
A method for treating sludge and recovering energy from a multi-stage dryer and a fluidized bed incinerator, the method comprising:
1) The municipal wet sludge is divided into two parts, one part is put into a multistage dryer for drying treatment and then is put into an incinerator, the other part is directly put into the incinerator, and the semi-dry sludge and the wet sludge which are treated by the multistage dryer are mixed before being put into the incinerator and then are put into the incinerator;
2) The sludge put into the dryer enters the interior from the top layer of the dryer, and high-temperature carrier gas is blown into the dryer from the second layer of the multi-stage dryer;
3) The high-temperature hot carrier gas directly contacts with the wet sludge to enable moisture in the wet sludge to be evaporated in a large quantity, the evaporated moisture is carried along with the wet sludge, the moisture and the sludge flow from the upper layer to the bottom layer gradually, the temperature is reduced gradually, and finally the multi-stage dryer is discharged from the bottom layer;
4) After the carrier gas exhausted by the multi-stage dryer passes through the primary heater, carrying out heat exchange with the flue gas generated by the incinerator in the sequential heater, enabling the flue gas to enter the secondary heater, enabling the carrier gas to enter the circulating induced draft fan, enabling part of the carrier gas to enter the secondary heater to exchange heat with the flue gas entering the secondary heater again, and returning the carrier gas to the multi-stage dryer for recycling, wherein when the carrier gas temperature is insufficient, high-temperature hot air generated by the natural gas hot air auxiliary furnace is reheated through the carrier gas temperature regulator; the rest carrier gas is directly sent to a spray tower for treating the flue gas of the incinerator for treatment;
5) And the flue gas after passing through the secondary heater enters a dust remover for dust removal, enters a flue gas reheater for cooling, removes part of dust at the same time, passes through a bag-type dust remover for removing dust, is deacidified by a spray tower, returns to a heated source inlet of the flue gas reheater, finally enters a chimney after being heated, and the high-temperature hot air of the natural gas hot air auxiliary furnace enters the chimney for merging with the flue gas after heat exchange by a carrier gas temperature regulator and is discharged to the atmosphere.
The invention adopts the high-efficiency direct multistage sludge dryer with the heat carrier gas directly in contact with the sludge for heat exchange, the sludge drying efficiency of the whole process is greatly improved, the heat carrier gas is recycled, and the incinerator flue gas is recycled as a heat source for heat treatment. The carrier gas exchanges heat with the high-temperature flue gas, and the high-temperature carrier gas is used as a heat source of the dryer to directly exchange heat with the sludge without arranging a waste heat boiler.
Compared with the existing sludge treatment technology, the invention has the characteristics that:
1) The high-efficiency direct heat exchange multistage sludge drying technology of direct heat exchange between the hot carrier gas and the sludge is adopted, the sludge drying efficiency of the whole process is improved by about 15%, and the energy-saving environment-friendly economic benefit is good.
2) The incinerator flue gas is used as a heat source for heating carrier gas to directly exchange heat with the carrier gas for recycling, a waste heat boiler is not required to be arranged, and equipment investment cost and operation cost are reduced.
3) The high-temperature hot carrier gas is recycled, the inside of the multi-stage dryer and the circulating pipeline are filled with water (steam state) evaporated by sludge, the oxygen content is below 3%, and the danger of ignition and explosion is avoided.
4) The carrier gas temperature regulator exchanges heat in an indirect way, reduces the fuel consumption of the hot blast stove, and does not have the danger of ignition and explosion.
Drawings
Fig. 1 is a schematic flow diagram of a system device for treating sludge and recovering energy from a practical multi-stage dryer and a fluidized bed incinerator according to an embodiment of the invention.
Detailed Description
The following describes in further detail the specific embodiments of the present invention with reference to the drawings and examples, which are provided to illustrate the present invention, but not to limit the scope of the present invention.
As shown in fig. 1, the system device for treating sludge and recovering energy from a practical multi-stage dryer and a fluidized bed incinerator comprises a multi-stage dryer 1, a fluidized bed incinerator 2, a primary heater 3, a circulating fan 4, a secondary heater 5, a dust remover 6, a flue gas reheater 7, a bag-type dust remover 8, a deacidification tower 9, a draught fan 10, a chimney 11, an auxiliary hot blast stove 12 and a carrier gas temperature regulator, and is characterized in that: the air inlet pipeline of the multi-stage dryer 1 is provided with a carrier gas temperature regulator 14. The wet sludge is connected to the multistage dryer 1 and the fluidized bed incinerator 2 through pipelines, and the dry sludge from the multistage dryer 1 is connected to the fluidized bed incinerator 2 through conveying equipment. Flue gas portion: the fluidized bed incinerator 2, the primary heater 3, the secondary heater 5, the dust collector 6, the flue gas reheater 7, the bag-type dust collector 8, the deacidification tower 9, the induced draft fan 10, the flue gas reheater 7, the chimney 11 are connected through pipelines. Carrier gas portion: the multistage dryer 1 and the primary heater 3, the primary heater 3 and the circulating fan 4, the circulating fan 4 and the secondary heater 5, the secondary heater 5 and the carrier gas temperature regulator 14, and the carrier gas temperature regulator 14 and the multistage dryer 1 are connected by pipelines.
The invention relates to a multistage dryer and a method for treating sludge and recycling energy by a fluidized bed incinerator, which comprises the following steps:
1) Municipal wet sludge is divided into two parts, one part is put into a multistage dryer 1 for drying treatment and then is put into a fluidized bed incinerator 2, the other part is directly put into the fluidized bed incinerator 2, and before being put into the fluidized bed incinerator 2, semi-dry sludge with the water content of about 30% and wet sludge with the water content of about 80% which are treated by the multistage dryer 1 are mixed and then are put into the fluidized bed incinerator 2.
2) The sludge fed into the multistage dryer 1 enters the inside from the top layer of the multistage dryer 1, and a hot carrier gas at about 400 ℃ is blown into the multistage dryer 1 from the second layer of the multistage dryer 1.
3) The carrier gas has a composition of water vapor evaporated from the sludge and a small amount of air, and about 85% of the carrier gas is water, the amount of air is small, and the oxygen content is less than 3%. The high-temperature hot carrier gas directly contacts with the sludge with high water content of about 80%, so that the water in the sludge is largely evaporated, the evaporated water is carried along with the sludge, and gradually flows from the upper layer to the bottom layer in the same direction as the sludge, the temperature is gradually reduced to about 150 ℃, and finally the multi-stage dryer 1 is discharged from the bottom layer.
4) The carrier gas passes through the primary heater 3 and the circulating fan 4, and after a part of the carrier gas enters the secondary heater 5 and is reheated to about 400 ℃, the carrier gas is returned to the multi-stage dryer 1 for recycling, and the rest carrier gas is directly sent to the deacidification tower 9 for flue gas treatment of the fluidized bed incinerator 2 for treatment.
5) When the carrier gas temperature is lower than 400 ℃, the carrier gas is reheated by the carrier gas temperature regulator 14 and then enters the multistage dryer 1. The carrier gas temperature regulator 14 regulates and controls the carrier gas temperature through indirect heat exchange of the carrier gas and the natural gas-assisted hot air.
6) And the flue gas after passing through the secondary heater 5 enters the dust remover 6 for dust removal, enters the flue gas reheater 7 for cooling to below 200 ℃, removes part of dust at the same time, removes dust through the bag-type dust remover 8, is deacidified through the deacidification tower 9, is heated by the flue gas reheater 7, enters the chimney 11, and is mixed with auxiliary hot air after heat exchange from the carrier gas temperature regulator 14 for heating, and then is discharged to the atmosphere.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (2)
1. A system for treating sludge and recovering energy by a multi-section dryer and a fluidized bed incinerator is characterized by comprising the multi-section dryer, the fluidized bed incinerator, a primary heater, a circulating induced draft fan, a secondary heater, a dust remover, a flue gas reheater, a belt dust remover, a deacidification spray tower, an induced draft fan, a chimney and an auxiliary hot blast furnace;
The multi-stage dryer is used for drying the input wet sludge and outputting semi-dry sludge;
the fluidized bed incinerator is connected with the output end of the multi-stage dryer through a pipeline and is used for incinerating the input wet sludge and the semi-dry sludge formed by the multi-stage dryer together;
The primary heater is provided with a flue gas input end, a flue gas output end, a carrier gas input end and a carrier gas output end, wherein the flue gas input end is connected with the flue gas output end of the fluidized bed incinerator through a pipeline, and the carrier gas input end is connected with the carrier gas output end of the multistage dryer through a pipeline;
The lower part of the secondary heater is provided with a smoke input end, a smoke output end, a carrier gas input end and a carrier gas output end, the smoke input end of the secondary heater is connected with the smoke output end of the primary heater through a pipeline, and the carrier gas input end of the secondary heater is connected with the carrier gas output end of the primary heater through a circulating induced draft fan;
The flue gas reheater is provided with a flue gas input end and a flue gas output end, and the flue gas output end of the secondary heater is connected with the flue gas input end of the flue gas reheater through a dust remover;
the flue gas output end of the flue gas reheater is connected to the belt type dust remover through a pipeline;
the flue gas input end of the deacidification spray tower is respectively connected with the carrier gas input end of the secondary heater and the flue gas output end of the belt type dust remover;
the flue gas output end of the deacidification spray tower is connected to the chimney through a draught fan;
the auxiliary hot blast stove comprises an air inlet end, a natural gas inlet end and a hot blast output end;
The hot air temperature regulator comprises a carrier gas input end, a carrier gas output end, an auxiliary hot air input end and an auxiliary hot air output end, wherein the auxiliary hot air input end of the hot air temperature regulator is connected with the hot air output end of the auxiliary hot air furnace, the auxiliary hot air output end is connected to a chimney for discharging through a pipeline, the carrier gas input end is connected with the carrier gas output end of the secondary heater through a pipeline, and the carrier gas output end of the hot air temperature regulator is connected to the air inlet end of the multi-stage dryer and is used for heating sludge of the multi-stage dryer;
The bypass to the deacidification spray tower is arranged on the air inlet pipeline of the secondary heater, a valve is arranged on the bypass and used for adjusting the circulating air carrying quantity, a flow control valve is arranged at the natural gas inlet end of the auxiliary hot blast stove, the natural gas flow of the auxiliary hot blast stove is controlled, and the natural gas flow is controlled and adjusted through a thermometer arranged at the air inlet end of the multi-section dryer.
2. A method of treating sludge and recovering energy using the system of claim 1, the method comprising:
1) The municipal wet sludge is divided into two parts, one part is put into a multistage dryer for drying treatment and then is put into an incinerator, the other part is directly put into the incinerator, and the semi-dry sludge and the wet sludge which are treated by the multistage dryer are mixed before being put into the incinerator and then are put into the incinerator;
2) The sludge put into the dryer enters the interior from the top layer of the dryer, and high-temperature carrier gas is blown into the dryer from the second layer of the multi-stage dryer;
3) The high-temperature hot carrier gas directly contacts with the wet sludge to enable moisture in the wet sludge to be evaporated in a large quantity, the evaporated moisture is carried along with the wet sludge, the moisture and the sludge flow from the upper layer to the bottom layer gradually, the temperature is reduced gradually, and finally the multi-stage dryer is discharged from the bottom layer;
4) After the carrier gas exhausted by the multi-stage dryer passes through the primary heater, carrying out heat exchange with the flue gas generated by the incinerator in the sequential heater, enabling the flue gas to enter the secondary heater, enabling the carrier gas to enter the circulating induced draft fan, enabling part of the carrier gas to enter the secondary heater to exchange heat with the flue gas entering the secondary heater again, and returning the carrier gas to the multi-stage dryer for recycling, wherein when the carrier gas temperature is insufficient, high-temperature hot air generated by the natural gas hot air auxiliary furnace is reheated through the carrier gas temperature regulator; the rest carrier gas is directly sent to a spray tower for treating the flue gas of the incinerator for treatment;
5) And the flue gas after passing through the secondary heater enters a dust remover for dust removal, enters a flue gas reheater for cooling, removes part of dust at the same time, passes through a bag-type dust remover for removing dust, is deacidified by a spray tower, returns to a heated source inlet of the flue gas reheater, finally enters a chimney after being heated, and the high-temperature hot air of the natural gas hot air auxiliary furnace enters the chimney for merging with the flue gas after heat exchange by a carrier gas temperature regulator and is discharged to the atmosphere.
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| CN201911054973.2A CN110953594B (en) | 2019-10-31 | 2019-10-31 | Multistage dryer and system for treating sludge and recycling energy by fluidized bed incinerator |
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| CN112082163A (en) * | 2020-09-09 | 2020-12-15 | 杭州国泰环保科技股份有限公司 | Sludge incineration method and sludge incineration system thereof |
| CN113958960A (en) * | 2021-10-28 | 2022-01-21 | 中原环保股份有限公司 | Municipal sludge treatment system |
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| CN211739114U (en) * | 2019-10-31 | 2020-10-23 | 上海市政工程设计研究总院（集团）有限公司 | System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy |
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|---|---|---|---|---|
| KR100261586B1 (en) * | 1998-02-24 | 2000-07-15 | 차동천 | Energy saving-type incineration system for fluidized bed sludge |
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| KR101760133B1 (en) * | 2017-01-23 | 2017-07-20 | 대림로얄이앤피(주) | Incinerator combined boiler for removing malodor of building exhaust gas |
| CN107830525A (en) * | 2017-11-17 | 2018-03-23 | 华南理工大学 | A kind of rubbish cooperates with incineration treatment method and device with semi-dry sludge |
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2019
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211739114U (en) * | 2019-10-31 | 2020-10-23 | 上海市政工程设计研究总院（集团）有限公司 | System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy |
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