CN112443849A - Biomass power plant coupling sludge drying incineration method - Google Patents
Biomass power plant coupling sludge drying incineration method Download PDFInfo
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- CN112443849A CN112443849A CN202011311173.7A CN202011311173A CN112443849A CN 112443849 A CN112443849 A CN 112443849A CN 202011311173 A CN202011311173 A CN 202011311173A CN 112443849 A CN112443849 A CN 112443849A
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- 239000010802 sludge Substances 0.000 title claims abstract description 125
- 238000001035 drying Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002028 Biomass Substances 0.000 title claims abstract description 18
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000000779 smoke Substances 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 10
- 239000010865 sewage Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000002920 hazardous waste Substances 0.000 description 4
- 238000004056 waste incineration Methods 0.000 description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
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
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- 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
-
- 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
-
- 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
-
- 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
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/10—Drying by heat
-
- 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
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
- F23G2206/203—Waste heat recuperation using the heat in association with another installation with a power/heat generating installation
-
- 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
-
- 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
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The invention relates to a drying and incinerating method for coupling sludge in a biomass power plant, wherein a dryer utilizes heat supply steam of the biomass power plant as a heat source; the condenser adopts the inlet water of the heater, and the inlet water returns to the outlet water of the heater after being heated; the dried sludge is sent to a sludge incineration boiler for individual incineration; the non-condensable odor discharged by the condenser is sent into a sludge incineration boiler provided with a smoke purifier through an exhaust fan to be thoroughly decomposed. The biomass power plant coupling sludge drying incineration method saves energy, the steam generated by the sludge incineration boiler can meet the requirement of about 50% of the steam consumption of a dryer, and the method is safe and environment-friendly, reduces the emission of harmful substances and protects the environment.
Description
Technical Field
The invention relates to a sludge drying and incineration treatment technology, in particular to a biomass power plant coupling sludge drying and incineration method.
Background
With the continuous enlargement of the scale of the municipal sewage treatment plant, the amount of sludge generated by the sewage treatment plant is continuously increased, the traditional sludge landfill disposal not only occupies the space of a refuse landfill, but also generates leachate which seriously pollutes the environment. The current common treatment mode is to dry steam supplied from the outside of a power plant, and dry sludge is sent to the power plant and mixed with coal to be burned in a boiler for power generation.
As shown in figure 1, sludge with 80% of water content from a sewage treatment plant is conveyed to a wet sludge warehouse for storage, the sludge from the wet sludge warehouse enters a drier, meanwhile, heating steam from a power plant with the pressure of 1.0MPa and the temperature of 300 ℃ is conveyed to the drier to heat the sludge, and the moisture of the sludge is evaporated to achieve the drying effect; the heating steam is condensed into water in the dryer and then is discharged outside or sent back to a power plant for utilization; and after the water content of the dried sludge is reduced to 30%, the dried sludge is discharged from the dryer and sent to a dry sludge bin for temporary storage, and the dry sludge in the dry sludge bin is conveyed to a power plant and mixed with coal and sent to a boiler for incineration power generation. The method comprises the steps that water vapor generated by sludge evaporation and odor are led out from a dryer and then enter a cyclone separator, dust is removed and then enter a condenser, cooling water of the condenser comes from a cooling tower and a circulating water pump, after steam generated by sludge evaporation is condensed into water in the condenser, the water is sent to a sewage treatment plant for treatment due to organic impurities, the uncondensed odor is pumped out of the condenser by an exhaust fan and sent to a deodorizer to be discharged into the atmosphere after the odor is removed.
The main problems of the above process are:
1. the energy consumption is high, the treatment cost is high, according to calculation, 10 tons of sludge with 80 percent of water content is dried to 30 percent of water content, 8 tons of steam with 0.8Mpa and 250 ℃ are consumed, and the heat of the evaporated water of the sludge is taken away by circulating water when a condenser of equipment is cooled and is discharged to the environment.
2. Odor evaporates along with moisture in the sludge drying process, and special equipment is needed for collection and centralized treatment, such as a deodorizer in figure 1, and the equipment generally adopts ultraviolet light irradiation or electron beam irradiation, so that the deodorization effect is poor, and environmental pollution is easily caused.
3. The dried sludge is sent to a power plant and is sent to a boiler together with coal for co-combustion, and because a flue gas purification facility (dedusting, desulfurizing and denitrifying) matched with the coal-fired boiler has poor removal effect on characteristic pollutants such as dioxin and mercury in sludge combustion, heavy metal components contained in the sludge can be diffused to the environment along with the utilization of ash slag of the coal-fired boiler.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the biomass power plant coupled sludge drying and incinerating method which is energy-saving, safe and environment-friendly and can reduce the emission of harmful substances.
The technical scheme adopted by the invention is as follows:
a biomass power plant coupling sludge drying and incinerating method,
the dryer utilizes heat supply steam of a biomass power plant as a heat source; the condenser adopts the inlet water of the heater, and the inlet water returns to the outlet water of the heater after being heated; the dried sludge is sent to a sludge incineration boiler for individual incineration; the non-condensable odor discharged by the condenser is sent into a sludge incineration boiler provided with a smoke purifier through an exhaust fan to be thoroughly decomposed.
A biomass power plant coupling sludge drying incineration method comprises the following steps: the method for drying and incinerating the sludge comprises the following steps:
step 3, condensing the heating steam into water in a drying machine and then sending the water back to a condenser of the power plant;
step 4, discharging the dried sludge from the dryer after the water content of the dried sludge is reduced to 30%, and conveying the sludge into a dry sludge bin for temporary storage;
step 5, feeding the dry sludge in the dry sludge bin into a sludge incineration boiler for incineration;
and 7, sending the steam generated by the sludge incineration boiler into a dryer to replace part of the steam of the power plant.
and 11, treating the flue gas discharged by the sludge incineration boiler by a flue gas purifier and then discharging the flue gas to the atmosphere. The discharged gas meets the pollution control standard for hazardous waste incineration (GB18484-2001) and then is discharged into the atmosphere.
Compared with the prior art, the invention has the beneficial effects that:
the biomass power plant coupling sludge drying incineration method saves energy, the steam generated by the sludge incineration boiler can meet the requirement of about 50% of the steam using amount of a dryer, for example, 10t/h of sludge containing 80% of water is treated, the sludge incineration boiler can generate 4t/h of steam, and the steam using power plant is reduced to 4t/h from 8 t/h; the heat of steam generated by evaporation of sludge discharged by a dryer is used for heating water fed into a low-pressure heater I of a power plant through a condenser, the heat is recycled and enters a power plant system, for example, the 10t/h sludge with 80% water content is treated, the six-stage steam extraction quantity of the low-pressure heater I of the power plant is reduced from 9.836t/h to 2.482t/h by using a steam turbine, and the steam is saved by 7.354 t/h; after being discharged from the condenser, the uncondensed odor is sent into the sludge incineration boiler through the exhaust fan to be thoroughly decomposed, so that the influence of the odor on the environment is eliminated; the sludge incineration boiler is provided with a special smoke purifier for treatment, meets the hazardous waste incineration pollution control standard (GB18484-2001) and then discharges, and eliminates the pollution of dioxin and mercury to the atmospheric environment.
Drawings
FIG. 1 is a schematic diagram of an incineration process flow of a conventional dry sludge power transmission plant;
FIG. 2 is a schematic of an existing power plant workflow;
FIG. 3 is a schematic process flow diagram of a biomass power plant coupled sludge drying and incineration method of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples:
in the figure:
1. wet sludge bin 2 and dryer
3. Cyclone 4, condenser
5. Exhaust fan 6 and dry sludge bin
7. Low-pressure water supply pump 8 and sludge incineration boiler
9. Flue gas purifier 10, steam turbine
11. Generator 12 and condenser
13. Condensate pump 14 and low-temperature heater I
15. Low-temperature heater II 16 and low-temperature heater III
17. Deaerator 18, high pressure feed water pump
19. High temperature heater I20, high temperature heater II.
As shown in fig. 2, the existing power plant production process is: the main steam that comes from biomass boiler gets into the steam turbine, it is rotatory to promote the steam turbine, the steam turbine drives the rotatory electric power that sends out of generator, the low pressure steam that gets into the condenser condensate water from steam turbine exhaust, the condensate water is sent into low pressure feed water pump in proper order into low pressure feed water heater I, low pressure feed water heater II and low pressure feed water heater III, by the six grades of steam extractions that come from the steam turbine, send into the oxygen-eliminating device deoxidization after five grades of steam extractions and the four grades of steam extractions heating, the oxygen-eliminating device goes out the water and sends into high pressure feed water pump I and high pressure feed water heater II in proper order after stepping up, the tertiary steam that is come from the steam turbine once more. Part of the steam from the three-stage extraction is extracted for use as an external supply steam.
As shown in fig. 3, a method for drying and incinerating sludge coupled with a biomass power plant includes: the method for drying and incinerating the sludge comprises the following steps:
step 3, condensing the heating steam into water in the dryer 2 and then sending the water back to the condenser 12 of the power plant;
step 4, discharging the dried sludge from the dryer 2 after the water content of the dried sludge is reduced to 30%, and conveying the sludge into a dry sludge bin 9 for temporary storage;
step 5, the dry sludge in the dry sludge bin 9 is sent into a sludge incineration boiler 8 for incineration;
and 7, sending the steam generated by the sludge incineration boiler 8 into the dryer 2 to replace part of the steam of the power plant.
and 11, treating the flue gas discharged by the sludge incineration boiler 8 through a flue gas purifier 9, and then discharging the flue gas to the atmosphere. The discharged gas meets the pollution control standard for hazardous waste incineration (GB18484-2001) and then is discharged into the atmosphere.
The biomass power plant coupling sludge drying incineration method saves energy, the steam generated by the sludge incineration boiler can meet the requirement of about 50% of the steam using amount of a dryer, for example, 10t/h of sludge containing 80% of water is treated, the sludge incineration boiler can generate 4t/h of steam, and the steam using power plant is reduced to 4t/h from 8 t/h; the heat of steam generated by evaporation of sludge discharged by a dryer is used for heating water fed into a low-pressure heater I of a power plant through a condenser, the heat is recycled and enters a power plant system, for example, the 10t/h sludge with 80% water content is treated, the six-stage steam extraction quantity of the low-pressure heater I of the power plant is reduced from 9.836t/h to 2.482t/h by using a steam turbine, and the steam is saved by 7.354 t/h; after being discharged from the condenser, the uncondensed odor is sent into the sludge incineration boiler through the exhaust fan to be thoroughly decomposed, so that the influence of the odor on the environment is eliminated; the sludge incineration boiler is provided with a special smoke purifier for treatment, meets the hazardous waste incineration pollution control standard (GB18484-2001) and then discharges, and eliminates the pollution of dioxin and mercury to the atmospheric environment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (2)
1. A biomass power plant coupling sludge drying incineration method is characterized in that:
the dryer utilizes heat supply steam of a biomass power plant as a heat source; the condenser adopts the inlet water of the heater, and the inlet water returns to the outlet water of the heater after being heated; the dried sludge is sent to a sludge incineration boiler for individual incineration; the non-condensable odor discharged by the condenser is sent into a sludge incineration boiler provided with a smoke purifier through an exhaust fan to be thoroughly decomposed.
2. A biomass power plant coupling sludge drying incineration method comprises the following steps: the power plant steam turbine (10) and the sludge incineration boiler (8) are characterized in that the sludge drying and incineration method comprises the following specific steps:
step 1, sludge with 80% of water content from a sewage treatment plant is conveyed to a wet sludge bin (1) for storage;
step 2, the sludge in the wet sludge bin enters a dryer (2); meanwhile, three-stage extraction steam from a steam turbine (10) of a power plant is 1.0MPa and is sent into a drier (2) at 300 ℃ to heat sludge;
step 3, condensing the heating steam into water in the dryer (2) and then sending the water back to a condenser (12) of the power plant;
step 4, discharging the dried sludge from the dryer (2) after the water content of the dried sludge is reduced to 30%, and conveying the sludge into a dry sludge bin (9) for temporary storage;
step 5, feeding the dry sludge in the dry sludge bin (9) into a sludge incineration boiler (8) for incineration;
step 6, pressurizing part of the effluent from the deaerator (17) of the power plant by a low-pressure water feeding pump (7) and then sending the pressurized effluent into a sludge incineration boiler (8) to generate steam,
step 7, the steam generated by the sludge incineration boiler (8) is sent into the dryer (2),
step 8, leading out water vapor generated by sludge evaporation and odor from the dryer (2), then feeding the water vapor and the odor into a cyclone separator (3), removing dust, then feeding the water vapor into a condenser (4),
step 9, feeding part of the water fed into the low-temperature heater I (14) of the power plant to a condenser (4) as cooling water, heating the water by the condenser (4), and feeding the water to the low-temperature heater I (14) for water outlet;
step 10, after steam generated by sludge evaporation is condensed into water in a condenser (4), the water is sent to a sewage treatment plant for treatment due to the organic impurities, and uncondensed odor is extracted from the condenser (4) by an exhaust fan (5) and sent to a sludge incineration boiler (8) for pyrolysis;
and 11, treating the flue gas discharged by the sludge incineration boiler (8) through a flue gas purifier (9) and then discharging the flue gas to the atmosphere.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311173.7A CN112443849A (en) | 2020-11-20 | 2020-11-20 | Biomass power plant coupling sludge drying incineration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311173.7A CN112443849A (en) | 2020-11-20 | 2020-11-20 | Biomass power plant coupling sludge drying incineration method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010025597A (en) * | 2001-01-10 | 2001-04-06 | 고재섭 | Burning up treatment method of sludge from waste water which making fuel |
| CN102964047A (en) * | 2012-07-23 | 2013-03-13 | 北京水泥厂有限责任公司 | Treatment method of sludge drying |
| CN104628237A (en) * | 2015-01-23 | 2015-05-20 | 广东电网有限责任公司电力科学研究院 | Sludge drying incineration system based on thermal power plant |
| CN108412562A (en) * | 2018-02-05 | 2018-08-17 | 安徽国祯生态科技有限公司 | A kind of fire coal coupled biological matter electrification technique and device |
| CN109824238A (en) * | 2019-03-04 | 2019-05-31 | 国惠环保新能源有限公司 | A kind of coal-fired coupling sludge heating system and method |
-
2020
- 2020-11-20 CN CN202011311173.7A patent/CN112443849A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010025597A (en) * | 2001-01-10 | 2001-04-06 | 고재섭 | Burning up treatment method of sludge from waste water which making fuel |
| CN102964047A (en) * | 2012-07-23 | 2013-03-13 | 北京水泥厂有限责任公司 | Treatment method of sludge drying |
| CN104628237A (en) * | 2015-01-23 | 2015-05-20 | 广东电网有限责任公司电力科学研究院 | Sludge drying incineration system based on thermal power plant |
| CN108412562A (en) * | 2018-02-05 | 2018-08-17 | 安徽国祯生态科技有限公司 | A kind of fire coal coupled biological matter electrification technique and device |
| CN109824238A (en) * | 2019-03-04 | 2019-05-31 | 国惠环保新能源有限公司 | A kind of coal-fired coupling sludge heating system and method |
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