CN212584968U - Cement kiln co-processing household garbage system containing desulfurization performance - Google Patents
Cement kiln co-processing household garbage system containing desulfurization performance Download PDFInfo
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- CN212584968U CN212584968U CN202021027716.8U CN202021027716U CN212584968U CN 212584968 U CN212584968 U CN 212584968U CN 202021027716 U CN202021027716 U CN 202021027716U CN 212584968 U CN212584968 U CN 212584968U
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- 239000004568 cement Substances 0.000 title claims abstract description 35
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 19
- 230000023556 desulfurization Effects 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 title claims abstract description 19
- 239000010813 municipal solid waste Substances 0.000 title claims description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003546 flue gas Substances 0.000 claims abstract description 81
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- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 4
- 229910001414 potassium ion Inorganic materials 0.000 claims abstract description 4
- 239000011734 sodium Substances 0.000 claims abstract description 4
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- 239000002699 waste material Substances 0.000 claims description 15
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a cement kiln coprocessing domestic waste system containing desulfurization performance, including msw incineration unit, burning flue gas processing unit and kiln tail system unit, the harmful high temperature flue gas that msw incineration back produced of msw incineration unit is sent into burning flue gas processing unit and is handled, burns flue gas processing unit and includes dore furnace, multi-stage preheater, kiln tail smoke chamber, cyclone, rapid cooling device, quench fan, bypass air bleeding dust remover and steam boiler, the high temperature flue gas that msw incineration unit produced is sent into the dore furnace, after the high temperature alkaline environment in the dore furnace decomposes the harmful substance in the gas and disposes, sends to kiln tail system unit through multi-stage preheater again; in order to slow down the circulating enrichment effect of chlorine, sodium and potassium ions, part of high-chlorine-content gas is extracted from a kiln tail smoke chamber and sequentially passes through a cyclone separator, a quenching device and a bypass air-bleeding dust remover, the bypass air-bleeding smoke and the smoke displaced by a decomposing furnace are respectively sent to a steam boiler for producing steam, and the smoke at the outlet of the steam boiler is sent to a kiln tail system unit for treatment.
Description
Technical Field
The utility model belongs to city domestic waste handles the field, especially relates to a cement kiln of desulfurization performance deals with domestic waste system in coordination.
Background
The stock of domestic garbage in cities in China reaches more than 60 hundred million tons, occupies more than 5 hundred million square meters of cultivated land, and rapidly increases at a speed of 9 percent while producing 2 hundred million tons of domestic garbage every year, so that the problem of domestic garbage disposal becomes the focus of attention of government departments and the whole people. The conventional techniques such as landfill and composting have been limited in their development due to their inherent disadvantages. At present, although domestic waste incineration power plants which are set up in many cities achieve certain achievements in the aspects of waste volume reduction, energy utilization and the like, the problems of discharge of harmful gas (dioxin), sewage (landfill leachate), waste residues (high heavy metal content) and the like are accompanied in the incineration process, and the dispute of people on waste incineration modes is caused. The rotary cement kiln has the characteristics of large system capacity, high working temperature, alkaline atmosphere and the like, and the unique processes provide excellent conditions for treating the municipal domestic waste.
Cement kilns have been used overseas for over 30 years in conjunction with solid waste disposal. In recent years, with the continuous attention of environmental protection in the cement industry, domestic cement kiln cooperative disposal technology also has achieved some achievements, and a plurality of enterprises are successively built with respective demonstration projects. The development of the sample technologies and the supporting equipment in the forms of multi-phase waste processing systems for cooperative disposal by Kaiheng Kenyuan (KKK), Conch (CKK), Huaxin (multipoint cooperation), Jinqie (quality-divided treatment), Huarun (MBH), middle-wood floating and cement kilns in institutes and the like has been successfully carried out in China. The cement kiln is used for cooperatively treating the municipal domestic garbage, so that on one hand, odor and toxic substances in the garbage treatment process can be eliminated by using the cement firing system; on the other hand, ash generated by burning the garbage can be used as a cement admixture, toxic substances in the garbage can be decomposed into corresponding inorganic substances, and heavy metals and the like are solidified in the cement clinker. Meanwhile, part of high-temperature waste gas of the cement kiln system can also be used as a supplementary heat source for waste incineration, so that the incineration process of the waste is more sufficient, the emission of dioxin is further reduced, and the requirements of harmless treatment, reduction and recycling of the waste treatment are met.
Most of the prior technical schemes introduce the smoke generated by garbage incineration into a cement kiln decomposing furnace for secondary incineration, and the smoke is sequentially subjected to a multi-stage preheater, a kiln tail waste heat boiler, a high-temperature fan and the like, and finally discharged from a chimney after dust removal. On one hand, after high-temperature flue gas generated by waste incineration is introduced into the decomposing furnace, the actual flue gas air quantity of a kiln line is higher than a design value, the temperature field and the flow field of the cement kiln predecomposition furnace are changed, and the resistance of the whole system is increased due to the increase of the flow speed of the flue gas. In order to ensure normal production of cement and energy conservation and consumption reduction of a system, a kiln line multi-stage preheater is required to be subjected to resistance reduction transformation, and then a high-temperature fan is replaced according to the field requirement, so that the system transformation workload is large, the cost is high, the resistance reduction transformation effect is limited, and the cooperative treatment capacity is limited to a certain extent. On the other hand, due to the influence of factors such as raw material components, part of acid gas is generated by domestic garbage incineration and cement raw material calcination, the method is attached to the existing kiln line flue gas treatment equipment, the emission value of the acid gas of a kiln tail chimney is extremely easy to exceed the standard, and the flue gas treatment cost of a cement enterprise is increased to reduce the emission of the acid gas under the large background of the ultra-clean emission of the cement kiln.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists and not enough, the utility model provides a cement kiln that contains desulfurization performance deals with domestic waste system in coordination, it is little to cement line and environmental impact, the system transformation with low costs, flue gas desulfurization benefit are good, is an economic and reliable domestic waste deals with domestic waste system in coordination.
The utility model discloses a realize through following technical scheme:
a cement kiln co-processing household garbage system with desulfurization performance comprises a garbage burning unit, a burning flue gas processing unit and a kiln tail system unit, wherein the garbage burning unit sends harmful high-temperature flue gas generated after garbage burning into the burning flue gas processing unit for processing; in order to slow down the circulating enrichment effect of chlorine, sodium and potassium ions, part of high-chlorine-content gas is extracted from a kiln tail smoke chamber and sequentially passes through a cyclone separator, a quenching device and a bypass air-bleeding dust remover, the bypass air-bleeding smoke and the smoke displaced by a decomposing furnace are respectively sent to a steam boiler for producing steam, and the smoke at the outlet of the steam boiler is sent to a kiln tail system unit for treatment.
Furthermore, the multi-stage preheater comprises C11, C12, C2, C3, C4 and C5 sections, and after the waste incineration flue gas enters the decomposing furnace, the flue gas is subjected to harmless treatment sequentially through the C5, C4, C3, C2, C12 and C11 sections of the multi-stage preheater.
Further, part of the high-temperature flue gas is extracted at the rear end of the outlet of the C4 section of the multi-stage preheater and is directly fed into a steam boiler to be used for producing steam.
Further, after the high-temperature flue gas is sent into the cyclone separator from the kiln tail smoke chamber, a large amount of high-activity fly ash roughly filtered by the cyclone separator is sent to the outlet air duct of the C2 section preheater and passes through the C12 and C11 sections of the multi-stage preheater to realize harmless treatment of the flue gas through high-temperature detoxification, so that the desulfurization of the waste gas at the tail of the cement kiln is realized.
Further, the garbage incineration unit comprises a garbage transport vehicle, a garbage storage pit, a travelling grab bucket, a feeding hole, a grate furnace, a primary air fan and a heat exchanger; garbage truck transports rubbish to the waste storage hole, and the driving grab bucket sets up in waste storage hole top, grabs rubbish into the feed inlet, and rubbish falls after getting into the feed inlet and carries out drying and burning at the grate furnace, and air is sent into for the grate furnace to the primary air fan, burns the produced high temperature flue gas of rubbish and sends into the dore furnace that burns the flue gas processing unit after passing through the heat exchanger.
Further, the kiln tail system unit comprises a kiln tail boiler, a steam turbine, a generator, a first high-temperature fan, a second high-temperature fan, a raw material mill, a kiln tail dust remover, a kiln tail fan and a chimney; the flue gas treated by the multi-stage preheater is fed into a kiln tail boiler to produce steam, the steam is led to a steam turbine and a generator to be used for generating electricity, the flue gas discharged by the kiln tail boiler and the steam boiler is respectively fed into a raw material mill inlet by a first high-temperature fan and a second high-temperature fan to be dried, then is fed into a kiln tail dust remover to further purify dust and SOx in the flue gas, and finally is fed into a chimney by a kiln tail fan to be discharged into the atmosphere after reaching the emission standard.
The utility model discloses beneficial effect:
the utility model provides a cement kiln co-processing domestic garbage system with desulfurization performance,
1) after the waste incineration flue gas enters the decomposing furnace, the smoke air volume of the kiln system is increased, the actual smoke air volume of the kiln line is higher than the design value, the equivalent high-temperature flue gas is replaced from the outlet of the C4 preheater, the influence of the increase of the smoke air volume on the stability of the kiln line can be reduced, and the rear end resistance reduction and transformation workload of the kiln system is reduced.
2) The incineration flue gas sequentially passes through C4 and C5 sections of the decomposing furnace and the multi-stage preheater, the retention time in the high-temperature alkaline environment in the kiln exceeds 10s, toxic and harmful substances in the flue gas can be fully reacted and decomposed, and the flue gas replaced by the system is the detoxified flue gas.
3) After the high-temperature flue gas extracted by the bypass vent of the system is subjected to quenching treatment, the temperature of the flue gas is still about 300 ℃, and the flue gas is connected to the heating surface at the tail end of the steam boiler, so that the gradient utilization and waste heat recovery of the heat energy of the flue gas can be realized.
4) The system bypass air discharge adopts two-stage filtration of a cyclone separator and a bypass air discharge dust remover, so that the generation amount of fly ash of bypass air discharge can be reduced; meanwhile, the high-activity fly ash which is collected by the cyclone separator and is rich in CaO is sent to the vicinity of an outlet air pipe of a cyclone cylinder of a C2 preheater, so that the desulfurization of the waste gas at the tail of the cement kiln is realized.
5) The flue gas discharged from the outlets of the kiln tail boiler and the steam boiler is respectively sent to the inlet of the raw material mill by the fan to be dried, and the dust and SOx in the flue gas can be further purified.
Drawings
FIG. 1 is a layout diagram of the apparatus of the present invention;
wherein: 1-a refuse transport vehicle; 2-a garbage storage pit; 3-a crane grab bucket; 4-a feed inlet; 5-grate furnace; 6-primary air blower; 7-a heat exchanger; 8-decomposing furnace; 9-a multi-stage preheater; 10-kiln tail smoke chamber; 11-a cyclone separator; 12-a quench unit; 13-a quench fan; 14-bypass air-bleeding dust remover; 15-kiln tail boiler; 16-a steam turbine; 17-a generator; 18-1-a first high temperature fan; 18-2-a second high temperature fan; 19-a steam boiler; 20-grinding raw materials; 21-kiln tail dust remover; 22-kiln tail fan; 23-chimney.
Detailed Description
The preferred mechanisms and methods of motion realization of the present invention are further described below in conjunction with the figures and the detailed description.
As shown in figure 1, the system for cooperatively treating the household garbage by the cement kiln with the desulfurization performance comprises a garbage incineration unit, an incineration flue gas treatment unit and a kiln tail system unit.
The waste incineration unit comprises a feeding device and an incineration device, the feeding device comprises a waste transport vehicle 1, a waste storage pit 2, a travelling grab bucket 3 and a feeding hole 4, and the incineration device comprises a grate furnace 5, a primary air fan 6 and a heat exchanger 7.
Garbage truck 1 transports rubbish to waste storage hole 2, and driving grab 3 sets up in waste storage hole 2 tops, grabs rubbish into feed inlet 4, and rubbish falls after getting into feed inlet 4 and carries out drying and burning at grate furnace 5, and air is sent into for grate furnace 5 to primary air fan 6, and the produced high temperature flue gas of burning rubbish sends into the dore 8 that burns the flue gas processing unit after passing through heat exchanger 7.
The incineration flue gas treatment unit comprises a decomposing furnace 8, a multi-stage preheater 9, a kiln tail smoke chamber 10, a cyclone separator 11, a quenching device 12, a quenching fan 13, a bypass air-release dust remover 14 and a steam boiler 19. The multi-stage preheater includes C11, C12, C2, C3, C4, and C5 stages.
The high-temperature flue gas passes through a heat exchanger 7 and then is sent into a decomposing furnace 8, harmful substances in the gas are decomposed and disposed through a high-temperature alkaline environment in the decomposing furnace 8, then a part of the decomposed flue gas passes through C5, C4, C3, C2, C12 and C11 sections of a multi-stage preheater in sequence to realize harmless disposal of the flue gas through high-temperature detoxification, and then is sent to a kiln tail boiler 15 of a kiln tail system unit, while the other part of the decomposed flue gas is sent to a kiln tail smoke chamber 10, and passes through a cyclone separator 11 and a quenching device 12 in sequence to slow down the circulating enrichment effect of chlorine, sodium and potassium ions, and then is sent to a bypass air-discharging dust remover 14 through a quenching fan 13, after dust removal, a part of harmful dust is deposited and discharged as air-fly ash, the other part of the detoxified flue gas is sent to a steam boiler 19 to produce steam, after the high-temperature flue gas is quenched and still is at about 300 ℃, the, the cascade utilization and waste heat recovery of the heat energy of the flue gas can be realized.
Meanwhile, part of the high-temperature flue gas can be extracted at the rear end of the outlet of the section C4 of the preheater and is directly fed into the steam boiler 19 for producing steam. The benefit of doing so is, after the msw incineration flue gas got into the dore furnace, kiln system smoke air volume increase, and the actual smoke air volume of kiln line is higher than the design value, puts from the export of C4 preheater and extracts a certain amount of high temperature flue gas, can reduce the influence of smoke air volume increase to kiln line stability, reduces kiln system rear end and falls to hinder the transformation work load.
In addition, after the decomposed high-temperature flue gas is sent into the cyclone separator 11 from the kiln tail smoke chamber 10, the cyclone separator 11 catches a large amount of high-activity fly ash rich in CaO and sends the fly ash to an outlet air duct of a preheater at the C2 section, so that the desulfurization of the waste gas at the tail of the cement kiln is realized.
The kiln tail system unit comprises a kiln tail boiler 15, a steam turbine 16, a generator 17, a first high-temperature fan 18-1, a second high-temperature fan 18-2, a raw material mill 20, a kiln tail dust remover 21, a kiln tail fan 22 and a chimney 23.
The steam produced by the kiln tail boiler 15 is led to a steam turbine 16 and a generator 17 for generating electricity, and the flue gas discharged from the outlets of the kiln tail boiler 15 and the steam boiler 19 is respectively sent to the inlet of a raw material mill 20 by a first high temperature fan 18-1 and a second high temperature fan 18-2 to participate in the drying of raw materials, then sent to a kiln tail dust remover 21 and further purify the dust and SOx in the flue gas, and finally sent to a chimney 23 by a kiln tail fan 22 to be discharged into the atmosphere after reaching the emission standard.
As shown in fig. 1, the specific working process of this embodiment is as follows:
garbage truck 1 transports rubbish to waste storage hole 2, and driving grab 3 sets up in waste storage hole 2 tops, grabs rubbish into feed inlet 4, and rubbish falls after getting into feed inlet 4 and carries out drying and burning at grate furnace 5, and air is sent into for grate furnace 5 to primary air fan 6, and the produced high temperature flue gas of burning rubbish sends into the dore 8 that burns the flue gas processing unit after passing through heat exchanger 7.
After the incineration flue gas is sent into the decomposing furnace 8, part of the flue gas is subjected to high-temperature detoxification by the decomposing furnace 8 and the multistage preheater 9 to realize harmless treatment of the flue gas, and the flue gas is sent into the kiln tail boiler 15 to produce steam, and then the steam is led to the steam turbine 16 and the generator 17 to be used for power generation; the other part of the flue gas is sent into a kiln tail smoke chamber 10, because the flue gas is high-temperature high-chlorine dust-containing flue gas, the flue gas is sent into a cyclone separator 11 to separate out high-temperature flue gas and a large amount of coarsely filtered high-activity fly ash, the high-temperature flue gas is further sent into a quenching device 12 to be cooled, and then is sent into a bypass air-bleeding dust remover 14 by a quenching fan 13, after dust removal, one part of harmful dust is slagging and air-bleeding fly ash, the other part of detoxified flue gas is sent into a steam boiler 19 to be used for producing steam, and the coarsely filtered large amount of high-activity fly ash is sent to an outlet air pipe of a C2 preheater and passes through C12 and C11 sections of a multistage preheater 9 to.
The flue gas discharged from the outlets of the kiln tail boiler 15 and the steam boiler 19 is respectively sent to the inlet of the raw material mill 20 by the first high temperature fan 18-1 and the second high temperature fan 18-2 to participate in the drying of the raw material, then sent to the kiln tail dust remover 21 to further purify the dust and SOx in the flue gas, and finally sent to the chimney 23 by the kiln tail fan 22 to be discharged into the atmosphere after reaching the emission standard.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications, equivalents, improvements and the like can be made in the technical solutions of the foregoing embodiments or in some technical features of the foregoing embodiments, but all modifications, equivalents, improvements and the like within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. The cement kiln co-processing household garbage system with desulfurization performance is characterized by comprising a garbage burning unit, a burning flue gas processing unit and a kiln tail system unit, wherein the garbage burning unit sends harmful high-temperature flue gas generated after garbage burning into the burning flue gas processing unit for processing; in order to slow down the circulating enrichment effect of chlorine, sodium and potassium ions, part of high-chlorine-content gas is extracted from a kiln tail smoke chamber and sequentially passes through a cyclone separator, a quenching device and a bypass air-bleeding dust remover, the bypass air-bleeding smoke and the smoke displaced by a decomposing furnace are respectively sent to a steam boiler for producing steam, and the smoke at the outlet of the steam boiler is sent to a kiln tail system unit for treatment.
2. The system for the cooperative disposal of the household garbage with the cement kiln having the desulfurization performance as recited in claim 1, wherein the multi-stage preheater comprises C11, C12, C2, C3, C4 and C5 sections, and the flue gas from the incineration of the garbage enters the decomposition furnace and then passes through the C5, C4, C3, C2, C12 and C11 sections of the multi-stage preheater in sequence to realize the harmless disposal of the flue gas.
3. The cement kiln co-disposal household garbage system with desulfurization capability as set forth in claim 2, wherein a portion of the high temperature flue gas is extracted at the rear end of the outlet of the C4 section of the multi-stage preheater and is directly fed into a steam boiler for steam production.
4. The system for the synergistic treatment of household garbage by the cement kiln with the desulfurization performance as claimed in claim 3, wherein after the high-temperature flue gas is sent into the cyclone separator from the kiln tail smoke chamber, a large amount of high-activity fly ash roughly filtered by the cyclone separator is sent to the outlet air duct of the preheater at the C2 section and passes through the C12 and C11 sections of the multi-stage preheater to realize the harmless treatment of the flue gas through high-temperature detoxification, so as to realize the desulfurization of the waste gas at the tail of the cement kiln.
5. The cement kiln co-disposal household garbage system with desulfurization capability as recited in claim 1, wherein the garbage incineration unit comprises a garbage truck, a garbage storage pit, a travelling grab, a feed inlet, a grate furnace, a primary air fan and a heat exchanger; garbage truck transports rubbish to the waste storage hole, and the driving grab bucket sets up in waste storage hole top, grabs rubbish into the feed inlet, and rubbish falls after getting into the feed inlet and carries out drying and burning at the grate furnace, and air is sent into for the grate furnace to the primary air fan, burns the produced high temperature flue gas of rubbish and sends into the dore furnace that burns the flue gas processing unit after passing through the heat exchanger.
6. The cement kiln co-disposal household garbage system with desulfurization capability as recited in claim 1, wherein the kiln tail system unit comprises a kiln tail boiler, a steam turbine, a generator, a first high temperature fan, a second high temperature fan, a raw meal mill, a kiln tail dust remover, a kiln tail fan and a chimney; the flue gas treated by the multi-stage preheater is fed into a kiln tail boiler to produce steam, the steam is led to a steam turbine and a generator to be used for generating electricity, the flue gas discharged by the kiln tail boiler and the steam boiler is respectively fed into a raw material mill inlet by a first high-temperature fan and a second high-temperature fan to be dried, then is fed into a kiln tail dust remover to further purify dust and SOx in the flue gas, and finally is fed into a chimney by a kiln tail fan to be discharged into the atmosphere after reaching the emission standard.
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| CN202021027716.8U CN212584968U (en) | 2020-06-05 | 2020-06-05 | Cement kiln co-processing household garbage system containing desulfurization performance |
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| CN202021027716.8U CN212584968U (en) | 2020-06-05 | 2020-06-05 | Cement kiln co-processing household garbage system containing desulfurization performance |
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