CN110953594A - System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy - Google Patents
System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy Download PDFInfo
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- CN110953594A CN110953594A CN201911054973.2A CN201911054973A CN110953594A CN 110953594 A CN110953594 A CN 110953594A CN 201911054973 A CN201911054973 A CN 201911054973A CN 110953594 A CN110953594 A CN 110953594A
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- flue gas
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- sludge
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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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- 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
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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
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
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- 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
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- 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
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- 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
Abstract
The invention relates to a system for treating sludge and recovering energy by a multi-section dryer and a fluidized bed incinerator. And 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 flow of the natural gas is controlled and regulated by a thermometer arranged on an air inlet pipe of the multi-section dryer. The invention adopts a high-efficiency direct multi-section sludge dryer, the sludge drying efficiency of the whole process is greatly improved, and the energy recovery system device can reduce the energy consumption and the cost and has the advantages of safety, energy conservation and environmental protection.
Description
Technical Field
The invention relates to a system for treating sludge and recovering energy by a multi-section dryer and a fluidized bed incinerator, belonging to the technical field of environmental protection.
Background
Along with the improvement of the urbanization development level of China, the urban sewage treatment rate is greatly improved, and meanwhile, a large amount of sludge is generated to be urgently treated. After sludge which is not properly treated enters the environment, secondary pollution is directly brought to water and atmosphere, the effective treatment capacity of a sewage treatment system is reduced, and the serious threat is formed to the ecological environment and human activities.
At present, the sludge disposal method mainly comprises three methods of landfill, composting agriculture and incineration. The waste of land resources is large by sludge landfill, and secondary pollution is easily caused to the environment by percolate in the transportation process and the landfill site; when sludge is composted or compound microbial fertilizers are prepared, heavy metal ions are easy to accumulate in soil and plants due to the fact that heavy metal and harmful substances in the sludge cannot be effectively removed, and land utilization is limited. The dried sludge can generate 12-20MJ/t of heat energy, is a fuel with low heat value, and the incinerated ash residue can not cause secondary pollution. Therefore, in the field of sludge treatment, sludge drying and incineration is a technology recommended by the state for environmental protection at present, has a wide application range, and is suitable for treating municipal sludge with different characteristics in China.
The core equipment of the sludge drying and incinerating process is a dryer and an incinerator. The dryer is a semi-dry sludge which is produced by drying wet sludge with the water content of 80% and has the water content of 30% or less, and the commonly used dryers for treating municipal sludge at present comprise a paddle dryer, a fluidized bed dryer, a thin layer dryer and the like. The incinerator is an environment-friendly device which can incinerate waste gas, waste liquid and solid waste at high temperature to achieve reduction, stabilization and harmlessness. At present, the application of the environment-friendly field of the drying machine and the incinerator is very wide.
At present, the state vigorously advocates energy-saving, environment-friendly, energy-saving and emission-reducing technologies. Therefore, effective measures are taken to recover energy of the sludge drying and incineration treatment process system, and the method has great significance for improving the energy utilization rate. At present, energy recovery adopts a form that high-temperature smoke generated by incineration is heated into steam by a waste heat boiler, and the steam is recycled as a heat source of a drying system. The waste heat of the flue gas can be recovered by the process, but waste heat boiler equipment needs to be added, and the heat recovery rate is relatively low.
At present, a sludge drying and incinerating treatment process is adopted for treating a lot of domestic sludge, but the sludge drying treatment process adopts indirect heat exchange, namely, water and high-temperature flue gas exchange heat to generate steam, the steam and wet sludge exchange heat indirectly in a drying machine, and the dried sludge enters an incinerator for treatment. The process has relatively low heat exchange efficiency, the carrier gas exchanges heat with the high-temperature flue gas, the high-temperature carrier gas is used as a heat source of the dryer to directly exchange heat with the sludge, a waste heat boiler is not required to be arranged, and the investment cost of equipment is reduced.
Disclosure of Invention
In order to improve the energy recovery and utilization of the sludge drying and incineration treatment process, the invention provides a multi-section dryer and a system for treating sludge and recovering energy by a fluidized bed incinerator.
In order to achieve the purpose, the technical scheme of the invention is as follows: a system for treating sludge and recovering energy by a multi-section drier 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 type dust remover, a deacidification spray tower, an induced draft fan, a chimney and an auxiliary hot air furnace;
the multi-section dryer is used for drying input wet sludge and outputting semi-dry sludge;
the fluidized bed incinerator is connected with the output end of the multi-section dryer through a pipeline and is used for incinerating input wet sludge and semi-dry sludge formed by the multi-section dryer;
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, the flue gas input end of the primary heater is connected with the flue gas output end of the fluidized bed incinerator through a pipeline, and the carrier gas input end of the primary heater is connected with the carrier gas output end of the multi-section dryer through a pipeline;
the lower part of the secondary 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, the flue gas input end of the secondary heater is connected with the flue gas 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 an induced draft 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 to be discharged, 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-section dryer and used for heating sludge of the multi-section dryer.
Furthermore, a bypass to the deacidification spray tower is arranged on an air inlet pipeline of the secondary heater, and a valve is arranged on the bypass and used for adjusting the circulating air-carrying capacity.
Furthermore, 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 the natural gas flow is controlled and regulated by a thermometer arranged at the air inlet end of the multi-section dryer.
A method for treating sludge and recovering energy by a multi-stage dryer and a fluidized bed incinerator is characterized by comprising the following steps:
1) dividing municipal wet sludge into two parts, putting one part into a multi-section dryer for drying treatment, then putting the part into an incinerator, directly putting the other part into the incinerator, mixing semi-dry sludge treated by the multi-section dryer with wet sludge before putting into the incinerator, and putting into the incinerator;
2) the sludge put into the dryer enters the dryer from the top layer of the dryer, and high-temperature carrier gas is blown into the dryer from the second layer of the multi-section dryer;
3) the high-temperature hot carrier gas directly contacts with the wet sludge to evaporate a large amount of moisture in the wet sludge and carry the evaporated moisture in the same direction as the sludge, the moisture gradually flows from the upper layer to the bottom layer, the temperature is gradually reduced, and finally the moisture is discharged out of the multi-section dryer from the bottom layer;
4) after passing through a primary heater, carrier gas discharged by the multi-section dryer exchanges heat with flue gas generated by an incinerator in a heater in sequence, the flue gas enters a secondary heater, the carrier gas enters a circulating induced draft fan, a part of the carrier gas enters the secondary heater to exchange heat with the flue gas entering the secondary heater again, and then is returned to the multi-section dryer for recycling, and when the temperature of the carrier gas is insufficient, high-temperature hot air generated by a natural gas hot air auxiliary furnace is reheated through a carrier gas temperature regulator; the residual carrier gas is directly sent to a spray tower for treating the flue gas of the incinerator for treatment;
5) the flue gas after passing through the secondary heater enters a dust remover for dust removal, then enters a flue gas reheater for temperature reduction, simultaneously removes partial dust, then passes through a bag-type dust remover for dust removal, is subjected to deacidification treatment by a spray tower, then returns to the heated source inlet of the flue gas reheater, is heated and finally enters a chimney, and the high-temperature hot air of the natural gas hot air auxiliary furnace enters the chimney after being subjected to heat exchange by a carrier gas temperature regulator, is converged with the flue gas and then is discharged to the atmosphere.
The invention adopts the direct multi-section sludge dryer with high efficiency for directly contacting and exchanging heat with the sludge by the hot carrier gas, greatly improves the sludge drying efficiency of the whole process, recycles the hot carrier gas, and recycles the flue gas of the incinerator as a heat source for heat treatment. The carrier gas exchanges heat with the high-temperature flue gas, the high-temperature carrier gas is used as a heat source of the dryer to directly exchange heat with the sludge, and a waste heat boiler is not needed.
Compared with the prior sludge treatment technology, the invention has the characteristics that:
1) by adopting the high-efficiency direct heat exchange multi-section sludge drying technology of direct contact heat exchange between hot carrier gas and sludge, the sludge drying efficiency of the whole process is improved by about 15 percent, and the energy-saving, environment-friendly and economic benefits are good.
2) The flue gas of the incinerator 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 needed, and the equipment investment cost and the operation cost are reduced.
3) The high-temperature heat carrier gas is recycled, the inside of the multi-section dryer and the circulating pipeline are filled with moisture (in a steam state) evaporated by sludge, the oxygen content is below 3 percent, and the danger of fire and explosion does not exist.
4) The carrier gas temperature regulator exchanges heat in an indirect mode, 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 chart of a system for treating sludge and recovering energy using a multistage dryer and a fluidized bed incinerator according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings and examples, which are provided for illustration of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the system device for treating sludge and recovering energy by using a multi-stage dryer and a fluidized bed incinerator includes 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 belt type dust remover 8, a deacidification tower 9, an induced draft 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-section dryer 1 is provided with a carrier gas temperature regulator 14. The wet sludge is connected with the multi-section drier 1 and the fluidized bed incinerator 2 through pipelines, and the dry sludge from the multi-section drier 1 is connected with the fluidized bed incinerator 2 through a conveying device. Flue gas part: the fluidized bed incinerator 2 is connected with the primary heater 3, the primary heater 3 is connected with the secondary heater 5, the secondary heater 5 is connected with the dust remover 6, the dust remover 6 is connected with the flue gas reheater 7, the flue gas reheater 7 is connected with the dust remover 8, the dust remover 8 is connected with the deacidification tower 9, the deacidification tower 9 is connected with the induced draft fan 10, the induced draft fan 10 is connected with the flue gas reheater 7, and the flue gas reheater 7 is connected with the chimney 11 through pipelines. Carrier gas part: the multi-section dryer 1 is connected with the primary heater 3, the primary heater 3 is connected with the circulating fan 4, the circulating fan 4 is connected with the secondary heater 5, the secondary heater 5 is connected with the carrier gas temperature regulator 14, and the carrier gas temperature regulator 14 is connected with the multi-section dryer 1 through pipelines.
The invention relates to a method for treating sludge and recovering energy by a multi-section dryer and a fluidized bed incinerator, which comprises the following steps:
1) the municipal wet sludge is divided into two parts, one part is put into the multi-section dryer 1 for drying treatment and then put into the fluidized bed incinerator 2, the other part is directly put into the fluidized bed incinerator 2, and the semi-dry sludge with the water content of about 30 percent after the multi-section dryer 1 is treated and the wet sludge with the water content of about 80 percent are mixed before the sludge is put into the fluidized bed incinerator 2 and then put into the fluidized bed incinerator 1.
2) The sludge put into the multi-stage dryer 1 enters the inside from the top layer of the multi-stage dryer 2, and hot carrier gas at about 400 ℃ is blown into the multi-stage dryer 2 from the second layer of the multi-stage dryer 2.
3) The carrier gas consists of water vapor evaporated from the sludge and a small amount of air, wherein about 85% of the carrier gas contains 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 percent, so that a large amount of water in the sludge is evaporated, the evaporated water is carried to flow from the upper layer to the bottom layer gradually in the same direction as the sludge, the temperature is reduced to about 150 ℃ gradually, and finally the multi-section dryer 1 is discharged from the bottom layer.
4) The carrier gas passes through a primary heater 3 and a steam circulating induced draft fan 4, a part of the carrier gas enters a secondary heater 5 and is heated to about 400 ℃, then the carrier gas is returned to the multi-stage dryer 1 for recycling, and the rest of the carrier gas is directly sent to a spray tower 9 for treating the flue gas of the fluidized bed incinerator 2.
5) When the temperature of the carrier gas is less than 400 ℃, the carrier gas is reheated by the carrier gas temperature regulator 14 and enters the multi-stage dryer 1. The carrier gas temperature regulator 14 regulates and controls the carrier gas temperature through indirect heat exchange between the carrier gas and the natural gas auxiliary hot air.
6) The flue gas after passing through the secondary heater 5 enters a dust remover 6 for dust removal, then enters a flue gas reheater 7 for cooling to a temperature below 200 ℃, meanwhile, after removing part of dust, the flue gas is subjected to dust removal through a bag-type dust remover 8, then is subjected to deacidification treatment through a spray tower 9, is heated by the flue gas reheater 7, then enters a chimney 11 and is mixed with heat-exchanged auxiliary hot air from a carrier gas temperature regulator 14 for heating, and then is discharged to the atmosphere.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A system for treating sludge and recovering energy by a multi-section drier 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 type dust remover, a deacidification spray tower, an induced draft fan, a chimney and an auxiliary hot air furnace;
the multi-section dryer is used for drying input wet sludge and outputting semi-dry sludge;
the fluidized bed incinerator is connected with the output end of the multi-section dryer through a pipeline and is used for incinerating input wet sludge and semi-dry sludge formed by the multi-section dryer;
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, the flue gas input end of the primary heater is connected with the flue gas output end of the fluidized bed incinerator through a pipeline, and the carrier gas input end of the primary heater is connected with the carrier gas output end of the multi-section dryer through a pipeline;
the lower part of the secondary 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, the flue gas input end of the secondary heater is connected with the flue gas 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 an induced draft 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 to be discharged, 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-section dryer and used for heating sludge of the multi-section dryer.
2. The system of claim 1, wherein: and a bypass to the deacidification spray tower is arranged on an air inlet pipeline of the secondary heater, and a valve is arranged on the bypass and used for adjusting the circulating air-carrying capacity.
3. The system of claim 1, wherein: the natural gas inlet end of the auxiliary hot blast stove is provided with a flow control valve for controlling the natural gas flow of the auxiliary hot blast stove, and the natural gas flow is controlled and regulated by a thermometer arranged on the air inlet end of the multi-section drier.
4. A method for treating sludge and recovering energy by a multi-stage dryer and a fluidized bed incinerator is characterized by comprising the following steps:
1) dividing municipal wet sludge into two parts, putting one part into a multi-section dryer for drying treatment, then putting the part into an incinerator, directly putting the other part into the incinerator, mixing semi-dry sludge treated by the multi-section dryer with wet sludge before putting into the incinerator, and putting into the incinerator;
2) the sludge put into the dryer enters the dryer from the top layer of the dryer, and high-temperature carrier gas is blown into the dryer from the second layer of the multi-section dryer;
3) the high-temperature hot carrier gas directly contacts with the wet sludge to evaporate a large amount of moisture in the wet sludge and carry the evaporated moisture in the same direction as the sludge, the moisture gradually flows from the upper layer to the bottom layer, the temperature is gradually reduced, and finally the moisture is discharged out of the multi-section dryer from the bottom layer;
4) after passing through a primary heater, carrier gas discharged by the multi-section dryer exchanges heat with flue gas generated by an incinerator in a heater in sequence, the flue gas enters a secondary heater, the carrier gas enters a circulating induced draft fan, a part of the carrier gas enters the secondary heater to exchange heat with the flue gas entering the secondary heater again, and then is returned to the multi-section dryer for recycling, and when the temperature of the carrier gas is insufficient, high-temperature hot air generated by a natural gas hot air auxiliary furnace is reheated through a carrier gas temperature regulator; the residual carrier gas is directly sent to a spray tower for treating the flue gas of the incinerator for treatment;
5) the flue gas after passing through the secondary heater enters a dust remover for dust removal, then enters a flue gas reheater for temperature reduction, simultaneously removes partial dust, then passes through a bag-type dust remover for dust removal, is subjected to deacidification treatment by a spray tower, then returns to the heated source inlet of the flue gas reheater, is heated and finally enters a chimney, and the high-temperature hot air of the natural gas hot air auxiliary furnace enters the chimney after being subjected to heat exchange by a carrier gas temperature regulator, is converged with the flue gas and then is discharged to the atmosphere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911054973.2A CN110953594A (en) | 2019-10-31 | 2019-10-31 | System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911054973.2A CN110953594A (en) | 2019-10-31 | 2019-10-31 | System for multistage desiccator and fluidized bed incinerator handle mud and recovery energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2019
- 2019-10-31 CN CN201911054973.2A patent/CN110953594A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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