CN107339702B - Method for cooperatively treating urban and rural domestic garbage by using cement kiln - Google Patents

Method for cooperatively treating urban and rural domestic garbage by using cement kiln Download PDF

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Publication number
CN107339702B
CN107339702B CN201710221978.4A CN201710221978A CN107339702B CN 107339702 B CN107339702 B CN 107339702B CN 201710221978 A CN201710221978 A CN 201710221978A CN 107339702 B CN107339702 B CN 107339702B
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garbage
air
domestic garbage
treatment
leachate
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CN201710221978.4A
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CN107339702A (en
Inventor
泥卫东
陈美男
李晓舟
张春辉
王星
魏锋
孙幸福
白云凤
李琦
王顺成
沈辉
蔡景明
张伟杰
张应中
唐盛伟
沈序辉
薛朝辉
张小军
余锐
莫正选
黄克勇
邓华明
曾娟
刘楷
陈锐章
梁国勋
周轮
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Huarun Environmental Protection Engineering Investment Ltd
Environmental Protection Engineering Co Ltd
Sandvik Intellectual Property AB
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Huarun Environmental Protection Engineering Investment Ltd
Environmental Protection Engineering Co Ltd
Sandvik Intellectual Property AB
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/033Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/02Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/38Removing components of undefined structure
    • B01D53/44Organic components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84Biological processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/24Cements from oil shales, residues or waste other than slag
    • C04B7/28Cements from oil shales, residues or waste other than slag from combustion residues, e.g. ashes or slags from waste incineration
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/43Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44Burning; Melting
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/43Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/47Cooling ; Waste heat management
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • F23G5/442Waste feed arrangements
    • F23G5/444Waste feed arrangements for solid waste
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/95Specific microorganisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/102Carbon
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention discloses a method for cooperatively treating urban and rural domestic garbage by using a cement kiln, and relates to the technical field of garbage treatment systems. The household garbage treatment system and the household garbage incineration system which are used as main disposal links can be implemented separately or built in a centralized manner according to different construction conditions. The domestic garbage pretreatment system and the domestic garbage incineration system need to be matched with each other to build a domestic garbage leachate treatment system and a deodorization system. The household garbage incineration system also needs to be matched with a bypass air discharge system. The invention has simple and convenient operation, stable operation, small investment and high benefit, realizes harmless treatment on waste residues, waste water and waste gas, can completely meet the requirements of national standards on environmental influence, and really realizes the purposes of harmless treatment, resource utilization, volume reduction and environmental protection of household garbage.

Description

Method for cooperatively treating urban and rural domestic garbage by using cement kiln
Technical Field
The invention relates to the technical field of garbage disposal systems, in particular to a method for cooperatively disposing urban and rural domestic garbage by using a cement kiln.
Background
The urban and rural domestic garbage generally refers to solid waste produced by urban and rural residents in life. At present, domestic garbage is not completely and effectively classified and collected, so that commercial garbage and garbage generated in municipal maintenance and management are mixed in urban and rural domestic garbage.
At present, the annual domestic garbage production amount reaches 1.65 hundred million tons, and the accumulated garbage in China reaches more than 70 hundred million tons. With the future increase in urban and rural population, annual garbage production is expected to increase at a rate of 8%. Most of domestic garbage is accumulated in suburbs without treatment, and the land occupation area reaches 5 hundred million square meters. The random disposal of the garbage damages urban and rural landscapes and also can breed pests and bacteria for spreading diseases. The garbage which is not effectively treated is easy to ferment after being stacked for a long time, and the generated harmful gases such as ammonia, nitrogen, sulfide, methane and the like are carried to form stink, so that the environment is polluted, heat is emitted, and even an explosion event is caused. A large amount of acidic and alkaline organic pollutants dissolve heavy metals in the garbage, become a concentrated pollution source of organic matters, heavy metals and pathogenic microorganisms, pollute surrounding surface water or permeate underground water to cause serious pollution of water resources, and then enter human bodies through a food chain to influence health.
Urban and rural domestic waste treatment becomes a problem of general attention worldwide, and is a very difficult comprehensive and systematic project. In many developed countries around the world, various methods have been used for treating domestic garbage in urban and rural areas, such as: landfill, compost, heat treatment, worm, feeding of urban and rural domestic garbage, bacterial digestion, water-borne method, microwave treatment or classified recovery, comprehensive utilization and the like. The main treatment methods are landfill, composting and heat treatment. The landfill method can occupy a large amount of land resources, and simultaneously can generate environmental problems of leachate leakage polluting underground water, large amount of greenhouse gas methane discharged into the atmosphere and the like; the problems of stink, product quality and product outlet caused by the composting method are always reasons for hindering the popularization and application of the composting method; the heat treatment method mainly uses an incineration method at present, is also a garbage treatment method commonly adopted by countries in the world at present, and has the characteristics of large treatment capacity, good compatibility and heat energy recovery.
The cement kiln co-disposed domestic garbage is increasingly applied to China as a method for incinerating garbage, but the utilization rate of the heat value of the garbage is low by the existing cement kiln co-disposed domestic garbage technology, and the heat generated by garbage combustion cannot be fully utilized. The existing technology is only suitable for garbage which is in bulk, light, inflammable and low in moisture, and the influence on a cement kiln system is large due to factors such as water content and particle size of the garbage, different burning positions of the garbage in the cement kiln and the like. The problems of odor generated in the pretreatment process, the storage and the conveying process of the garbage, percolate, waste residue generated after the garbage is burnt and the like can not be effectively and thoroughly treated all the time.
In conclusion, the invention designs a method for cooperatively treating urban and rural domestic garbage by using a cement kiln.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for cooperatively treating urban and rural domestic garbage by using the cement kiln, which has the advantages of simple and convenient operation, stable operation, small investment and high benefit, realizes harmless treatment on waste residues, waste water and waste gas, can completely meet the requirements of national standards on environmental influence, and really realizes the purposes of harmless treatment, recycling, volume reduction and environmental protection of the domestic garbage.
In order to achieve the purpose, the invention is realized by the following technical scheme: a system for cooperatively treating urban and rural domestic garbage by a cement kiln comprises a domestic garbage pretreatment system, a domestic garbage incineration system, a domestic garbage leachate treatment system, a deodorization system and a bypass ventilation system, wherein odorous air from the domestic garbage pretreatment system, the domestic garbage incineration system and the domestic garbage leachate treatment system is hermetically connected to the deodorization system through an exhaust pipeline; leachate or process wastewater from a domestic garbage pretreatment system, a domestic garbage incineration system and a deodorization system is conveyed to the leachate treatment system through a collection tank and a pipeline, the domestic garbage incineration system needs to be transformed and implanted into the existing cement clinker production line through thermal equipment, and a bypass air discharge system is connected with the cement clinker production line through a thermal pipeline to extract part of high-temperature flue gas for sulfur, chlorine and alkali content control; the household garbage pretreatment system and the household garbage incineration system are main disposal links, and can be separately implemented or intensively built according to different construction conditions. The domestic garbage pretreatment system and the domestic garbage incineration system need to be matched with each other to build a domestic garbage leachate treatment system and a deodorization system. The household garbage incineration system also needs to be matched with a bypass air discharge system.
Preferably, the domestic garbage pretreatment system comprises a movable air compressor, a first grab bridge crane, a shear crusher, a baffle flat belt conveyor, a second grab bridge crane, a dehydrator, a blanking steel bin, a third grab bridge crane, a belt type speed-regulating quantitative feeder, a pipe conveyor, garbage percolate, a primary ecological garbage storage pit, a crushed garbage storage pit and a dehydrated garbage storage pit, the domestic garbage is conveyed to the primary ecological garbage storage pit of the pretreatment workshop through a garbage transport vehicle, the movable air compressor for cleaning the vehicle is arranged on one side of the garbage transport vehicle, then the domestic garbage is conveyed to the blanking hopper above the shear crusher through the first grab bridge crane, and the crushed domestic garbage is conveyed to the pit through the belt conveyor; in the storage pit, the garbage is turned over and stacked by a second grab bucket bridge crane and is forced to ventilate, the biological fermentation speed is increased, and the free water content is increased; after 5-10 days, the garbage is conveyed to the dehydrator by the second grab bucket bridge crane for extrusion dehydration and is conveyed to the blanking steel bin, and is conveyed to the dehydrated garbage storage pit by the blanking steel bin, and the garbage in the dehydrated garbage storage pit is conveyed to the belt type speed-regulating constant feeder by the third grab bucket bridge crane and is conveyed to the household garbage incineration system by the pipe conveyor for treatment.
Preferably, the household garbage incineration system comprises three air locking valves, a cold storage bin, a decomposing furnace, a four-stage cyclone cylinder, a hot plate furnace and a cooling fan, wherein a rubber belt conveyor is arranged above the three air locking valves, the three air locking valves are connected with the hot plate furnace in a sealing mode through a blanking pipe, the cooling fan is arranged below the hot plate furnace, the hot plate furnace is further connected with the decomposing furnace and the four-stage cyclone cylinder respectively, the hot plate furnace is implanted after necessary transformation is carried out on a smoke chamber ascending flue to a decomposing furnace cone section through a cement clinker production line, and the household garbage entering the hot plate furnace is ignited and combusted in the hot plate furnace and then enters the cement kiln through the ascending flue for further incineration disposal.
Preferably, the domestic garbage leachate treatment system (3) comprises an anaerobic treatment module, a denitrification module, a nitrification module, a cooling system module, an ultrafiltration module (3-5), a nanofiltration module and a reverse osmosis module, the landfill leachate enters an underground leachate collection tank in a self-flowing mode, when the liquid level in the collection tank reaches a certain height, a sewage pump pumps the leachate into a regulating tank of the anaerobic treatment module for leachate treatment, and sludge and concentrated liquid generated after passing through the denitrification module, the nitrification module, the cooling system module, the ultrafiltration module, the nanofiltration module and the reverse osmosis module are directly conveyed into a cement kiln for incineration treatment, so that the treatment cost of secondary waste is effectively reduced; the treated water is reused in a process system, and zero discharge of waste water is realized.
Preferably, the deodorization system comprises a wind gathering box, a deodorization fan, a water bath type dust removal device, a biological filter, a pre-washing water tank, a sludge discharge tank, a spraying water tank, an active carbon tower and a grate cooler cooling fan wind pipe, wherein the wind gathering box is sequentially connected with the water bath type dust removal device, the biological filter and the active carbon tower through the deodorization fan, the pre-washing water tank, the sludge discharge tank and the spraying water tank are arranged below the biological filter, and the wind gathering box is also connected with the grate cooler cooling fan wind pipe through the induced draft fan; the biological filter and the spraying water tank are connected in a sealing mode through an exhaust pipe, and a fan and an air collecting box are installed on the right side of the biological filter.
Preferably, the bypass air discharge system comprises a bypass cyclone cylinder, a flue gas cooler, a dust collector, a second cooling fan and an ash deposition bin, the second cooling fan pumps out excessive potassium, sodium and chlorine gases, the excessive potassium, sodium and chlorine gases are discharged from the cement clinker firing system through the bypass cyclone cylinder, the flue gas cooler and the dust collector, and after a certain amount of gases are pumped, the skinning and caking of chlorine elements can be effectively reduced or avoided, the air draft of the bypass air discharge system is determined by the chlorine content in garbage and the chlorine content in cement raw materials, and the flue gas cooler and the dust collector are also connected with the ash deposition bin.
A method for cooperatively treating urban and rural domestic garbage by a cement kiln comprises the following specific process flows: the method comprises the steps that original ecological household garbage enters an original ecological household garbage storage pit after entering a factory, primary breaking operation is completed through a grab bucket bridge crane sequentially through a plate feeder and a shear type crusher to form garbage fragments with the granularity of 90% smaller than 200mm, the household garbage storage pit is periodically turned over and stacked through a grab bucket, a bottom air blowing device periodically blows air, leachate is sprinkled to carry out biological drying treatment for 5-10d, the biochemical treatment is carried out, the household garbage fragments are conveyed to a finished product household garbage storage area through grab bucket bridge crane sequentially through the plate feeder and a dehydrator to be mechanically dewatered, and the household garbage fragments are conveyed reversely through the grab bucket to be conveyed to a finished product garbage bin.
Preferably, the deodorization system sends the odor-containing air from the domestic garbage pretreatment system, the domestic garbage incineration system and the domestic garbage leachate treatment system through a sealed pipeline and a fan to the side of a kiln head cooling machine of the cement kiln as the air for the cement production process to be consumed and disposed when a matched cement production line is in normal operation, and sends the odor-containing air to a professional deodorization device for purification treatment in emergency.
The invention has the following beneficial effects:
1. the characteristics of wide application range and low moisture requirement of the hot plate furnace on the garbage are fully utilized, and the preliminary treatment (such as classification and sorting) work of the garbage incineration is greatly reduced.
2. By adopting a combined garbage pretreatment mode of mechanical treatment and biological drying, the particle size and the water content of the garbage are greatly reduced, the heat value of the garbage is increased, and the influence on a cement clinker firing system is reduced.
3. The heat value of the garbage and the chemical composition of the garbage are fully utilized, the coal used by a cement clinker firing system can be reduced, the generated energy of a waste heat power generation system is increased, and the using amount of the denitration ammonia water at the tail of the kiln is reduced.
4. The high firing temperature of the rotary kiln system and the forming conditions of cement clinker are fully utilized, the residue and fly ash generated after the garbage is burned are doped into the raw meal, and finally the cement clinker is fired through high-temperature calcination, harmful heavy metal elements in the household garbage are dissolved in the clinker to form silicate minerals, and the harm of the heavy metals in the garbage to the environment is avoided.
5. The pretreatment workshop and the cooperative treatment workshop are kept in a micro negative pressure state by extracting the odor of the pretreatment workshop and the cooperative treatment workshop, so that the odor is effectively prevented from overflowing, meanwhile, the part of the odor is sent to the grate cooler to be used as cooling air, and the odor is treated at high temperature of more than 1400 ℃ in the rotary kiln and more than 900 ℃ in the decomposing furnace, so that the odor factor is ensured to be thoroughly decomposed.
6. The water of the landfill leachate treated by the landfill leachate treatment system is reused in the process system, and zero discharge of wastewater is realized. The generated sludge and concentrated solution are directly conveyed into the cement kiln to be incinerated, so that the disposal cost of secondary waste is effectively reduced.
7. The contents of potassium, sodium and chlorine elements in the garbage are high, and the bypass air discharge system is configured to effectively reduce or avoid the skin formation and agglomeration in the kiln after a certain amount of gas is extracted, so that the fluctuation of the cement kiln production is avoided.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a system flow diagram of the present invention;
FIG. 2 is a flow chart of the household garbage pretreatment system of the present invention;
FIG. 3 is a flow chart of the household garbage incineration system of the present invention;
FIG. 4 is a flow chart of the domestic waste leachate treatment system of the present invention;
FIG. 5 is a flow diagram of the deodorizing system of the present invention;
FIG. 6 is a flow chart of the bypass bleed system of the present invention;
in the figure: 1. a household garbage pretreatment system; 1-1, a mobile air compressor; 1-2, a first grab bridge crane; 1-3, a shear type crusher; 1-4, a baffle flat belt conveyor; 1-5, a second grab bridge crane; 1-6, a dehydrator; 1-7, blanking steel bins; 1-8, a third grab bridge crane; 1-9, a belt type speed-regulating constant feeder; 1-10, a tubular conveyor; 1-11, landfill leachate; 1-12, storing the original ecological garbage; 1-13, storing the crushed garbage in a pit; 1-14, storing the dewatered garbage in a pit; 2. A household garbage incineration system; 2-1, three air locking valves; 2-2, a cold material bin; 2-3, a decomposing furnace; 2-4, a four-stage cyclone; 2-5, heating a plate furnace; 2-6, cooling fan; 3. a domestic garbage leachate treatment system; 3-1, an anaerobic treatment module; 3-2, a denitrification module; 3-3, a nitration module; 3-4, cooling system module; 3-5, an ultrafiltration module; 3-6, a nanofiltration module; 3-7, a reverse osmosis module; 4. a deodorizing system; 4-1, a wind gathering box; 4-2, a fan; 4-3, removing dust in a water bath manner; 4-4, a biological filter; 4-5, pre-washing a water tank; 4-6, a sludge discharge pool; 4-7, spraying a water pool; 4-8, an active carbon tower; 4-9, cooling fan air pipes of the grate cooler; 5. a bypass windproof system; 5-1, a bypass cyclone; 5-2, a flue gas cooler; 5-3, a dust collector; 5-4, a second cooling fan; 5-5, an ash accumulation bin.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1 to 6, the following technical solutions are adopted in the present embodiment: the utility model provides a system for cement kiln deals with urban and rural domestic waste in coordination, includes domestic waste pretreatment system 1, domestic waste incineration system 2, domestic waste leachate processing system 3, deodorization system 4 and bypass system 5 of letting out wind, its characterized in that: the domestic garbage pretreatment system and the domestic garbage incineration system which are used as main disposal links can be implemented separately or built in a centralized manner according to different construction conditions; the domestic garbage pretreatment system and the domestic garbage incineration system are matched to build a domestic garbage leachate treatment system and a deodorization system; the household garbage incineration system also needs to be matched with a bypass air discharge system; the odor-containing air from the domestic garbage pretreatment system, the domestic garbage incineration system and the domestic garbage leachate treatment system is hermetically connected to the deodorization system through an exhaust pipeline; leachate or process wastewater from a domestic garbage pretreatment system, a domestic garbage incineration system and a deodorization system is conveyed to the leachate treatment system through a collection tank and a pipeline, the domestic garbage incineration system needs to be transformed and implanted into the existing cement clinker production line through thermal equipment, and a bypass air discharge system is connected with the cement clinker production line through a thermal pipeline to extract part of high-temperature flue gas for sulfur, chlorine and alkali content control.
The household garbage pretreatment system of the specific embodiment comprises: the household garbage is conveyed to an original ecological garbage storage pit 1-12 of a pretreatment workshop through a garbage transport vehicle, then conveyed to a discharge hopper above a shear type crusher 1-3 through a first grab bucket bridge crane 1-2, and conveyed to a storage pit 1-13 through a belt conveyor 1-4 after being crushed. In the storage pit, the garbage is subjected to stack turning and forced ventilation by a second grab bucket bridge crane 1-5, the biological fermentation speed is increased, and the free water content is increased. After 5-10 days, the garbage is sent to a dehydrator 1-6 by a second grab bucket bridge crane 1-5 for extrusion dehydration. The dewatered garbage is conveyed to a household garbage incineration system for treatment through a constant feeder 1-9 and a tubular conveyor 1-10. The invention adopts a combined garbage dehydration mode of biological drying and mechanical dehydration, the crushed household garbage is ventilated by an air blower in a storage pit which is independently stored for 10 days, and meanwhile, a travelling crane is used for stack turning operation, so that the household garbage is subjected to aerobic fermentation, and part of the water in the household garbage is removed, thereby being beneficial to reducing the water content of the household garbage, simultaneously improving the heat value of the household garbage and being beneficial to cooperative disposal.
Domestic waste system of burning: the pretreated domestic garbage enters a dehydrated garbage storage pit 1-14, is conveyed to a weighing feeding bin by a crane grab bucket, is conveyed to a cement kiln tower after being measured, is conveyed to a hot plate furnace 2-6 through a three-way air locking valve 2-1, is dried and ignited to burn in high-temperature tertiary air (900 ℃), the temperature of the outlet of the hot plate furnace can rise, and is continuously fed through a four-stage cyclone cylinder 2-4 to adjust the burning temperature to 1050 ℃. The residues after incineration enter a cement clinker production line system to form cement clinker; the gas generated by burning is burnt at high temperature under alkaline environment to thoroughly decompose harmful components, and then is cooled by a specific rapid heat exchange process at the tail of a cement kiln and then is discharged into the atmosphere. Compared with an off-line garbage gasification combustion furnace, the on-line hot plate furnace technology of the invention has the advantages that the generated high-temperature gas, the combustion ash content of waste materials, raw materials, small-particle sintering slag and the like all enter a decomposing furnace, and a small amount of large-particle sintering slag falls down from a kiln tail uptake flue and enters a rotary kiln. The heat energy in the garbage is fully utilized, and the materials and the gas are all taken from and returned to the original system, so that the heat efficiency of the system is greatly improved, and the process links of heat loss and recycling of the discharged waste residues are avoided.
Domestic waste leachate treatment system: the main source of the landfill leachate is that the primary garbage is aerobically fermented and mechanically dewatered, and the generated organic wastewater is high-concentration organic wastewater generally. Because the bottom of the storage pit has a certain gradient, the garbage percolate enters the underground percolate collecting tank 1-11 in a self-flowing mode, and when the liquid level in the collecting tank reaches a certain height, the sewage pump pumps the percolate into the regulating tank of the anaerobic treatment module 3-1 to carry out percolate treatment. Necessary anti-seepage measures are adopted at the bottom and the periphery of the primary garbage storage pit and the percolate collecting pool, so that seepage of percolate is prevented, and underground water is prevented from permeating. Sludge and concentrated solution generated by the processes of the denitrification module 3-2, the nitrification module 3-3, the cooling system module 3-4, the ultrafiltration module 3-5, the nanofiltration module 3-6 and the reverse osmosis module 3-7 are directly conveyed into a cement kiln to be incinerated and disposed, so that the disposal cost of secondary waste is effectively reduced; the treated water is reused in a process system, and zero discharge of waste water is realized.
A deodorization system: when the cement kiln normally operates, odor from the pretreatment workshop and the co-processing workshop is introduced into the grate cooler of the cement kiln through the induced draft fan and enters the grate cooler of the cement kiln through the air duct 4-9 of the cooling fan of the grate cooler to be used as cooling air, volatile organic matters in the odor are combusted in the process of contacting with high-temperature clinker, and the combusted air is used as secondary air and is processed by high temperature of more than 1400 ℃ and more than 900 ℃ in a decomposition furnace in a rotary kiln, so that the odor factor-volatile organic matters are ensured to be thoroughly decomposed. When the cement kiln is stopped, the odor is sent into a special deodorization device for purification treatment. The special deodorization device comprises 4-1 parts of a wind gathering box, 4-2 parts of a fan, 4-3 parts of water bath type dust removal, 4-4 parts of a biological filter, 4-5 parts of a pre-washing water tank, 4-6 parts of a sludge discharging tank, 4-7 parts of a spraying water tank and 4-8 parts of an active carbon tower. The whole processes of the storage and transportation links of the garbage and the leachate treatment system are closed, and no waste gas is leaked.
Bypass system of letting out wind: the domestic garbage is high in potassium, sodium and chlorine contents, the excessive existence of the domestic garbage can affect the operation stability of a firing system and the quality of a cement product, and volatile components are easy to form closed-loop circulating enrichment in a proper temperature area of a kiln tail and a preheater to cause the corresponding position of the kiln tail or the preheater to be skinned and blocked, and the stable and normal operation of the firing system is seriously affected; excessive potassium, sodium, chlorine and the like enter the cement clinker, so that on one hand, the alkali-aggregate reaction is easy to occur, and the service life of the concrete is shortened; on the other hand, the steel bars in the concrete are corroded, and the structural strength of the concrete is influenced. Excessive potassium, sodium and chlorine gases are pumped out by a cooling fan 5-4 and discharged out of a cement clinker firing system through a bypass cyclone 5-1, a flue gas cooler 5-2 and a dust collector 5-3, so that the skinning and caking of chlorine elements can be effectively reduced or avoided after a certain amount of gases are pumped out, and the air pumping quantity of a bypass air discharging system is determined by the chlorine content in garbage and the chlorine content in cement raw materials.
The process principle of the specific embodiment is as follows: the household garbage is conveyed to a pretreatment workshop by a garbage truck, is firstly unloaded to a garbage storage pit, is then conveyed to a plate feeder above a crusher by a travelling crane and a grab bucket to be evenly discharged to the crusher, is crushed by the crusher and then slides into the storage pit through a discharging scraper-trough conveyer, is subjected to aerobic fermentation for 5-10 days in a ventilation mode in the storage pit, is then conveyed to the plate feeder above a dehydrator by the travelling crane and the grab bucket to be evenly discharged to the dehydrator for extrusion and dehydration, falls on the plate feeder after dehydration, is then conveyed to the discharging storage pit for short-term storage, is conveyed to the plate feeder above a finished product bin by the travelling crane and the grab bucket to be discharged to a metering feeder, and is conveyed to a hot plate furnace for incineration treatment through a belt type speed regulation metering feeder and a tubular rubber belt conveyor. The hot plate furnace feeding pipeline is provided with three air locking valves to prevent air leakage, and the safety gate valve can be immediately closed when the system is powered off or manually operated. Garbage enters the hot plate furnace through the scraper-trough conveyer, high-temperature tertiary air from the grate cooler completely enters the hot plate furnace through the tertiary air pipe and is mainly used as a heat source for burning the garbage by the hot plate furnace, gas with the temperature of more than 1000 ℃ generated after the garbage in the hot plate furnace is burnt is introduced into the decomposing furnace and then burnt together with coal powder, a certain amount of hot raw materials are shunted from an outlet of the four-stage cyclone cylinder and are fed into the hot plate furnace as an auxiliary heat supply or a carrier for decomposing and absorbing heat, and the purpose of controlling the gas temperature of the hot plate furnace can be achieved by adjusting the amount of the hot raw materials. High-temperature gas generated by the hot plate furnace, combustion ash of waste materials, raw materials, small-particle sintering slag and the like enter the decomposing furnace, a small amount of large-particle sintering slag falls into the rotary kiln from the kiln tail ascending flue and is calcined into cement clinker by the rotary kiln system, and heavy metal harmful elements are dissolved in the clinker by solid solution at the flame temperature of more than 1600 ℃ of a burning zone in the rotary kiln, so that the heavy metals cannot be leached and migrated to pollute the environment in the cement hydration process. The burned flue gas (containing unburned organic components and the like) is sent into a decomposing furnace of the cement kiln, the organic components are continuously decomposed or cracked through the decomposing furnace, so that the toxic organic matters are thoroughly decomposed, and the kiln tail waste gas is purified by a dust collecting system and is discharged from a chimney. The landfill leachate in the landfill storage pit enters an underground leachate collecting tank in a self-flowing mode, and when the liquid level in the collecting tank reaches a certain height, a sewage pump pumps the leachate into a leachate treatment system regulating tank for leachate treatment. Necessary anti-seepage measures are adopted at the bottom and the periphery of the garbage storage pit and the percolate collecting tank, so that seepage of percolate is prevented, and underground water is prevented from permeating. Sludge and concentrated solution generated in the percolate treatment process are directly pumped into a cement kiln to be incinerated, so that the treatment cost of secondary waste is effectively reduced; the treated water is reused in a process system, and zero discharge of waste water is realized. The whole processes of the storage and transportation links of the garbage and the leachate treatment system are closed, and no waste gas is leaked. In the storage link, the pretreatment workshop adopts a full-sealing structure, and keeps a micro-negative pressure state to prevent odor from leaking. When the cement kiln normally operates, the odor from the pretreatment workshop and the cooperative treatment workshop is guided to the cement kiln grate cooler through the induced draft fan and is used as cooling air, volatile organic compounds in the odor are combusted in the process of contacting with high-temperature clinker, and the combusted air is used as secondary air and is treated at the high temperature of more than 1400 ℃ in the rotary kiln and more than 900 ℃ in the decomposing furnace, so that the odor can be thoroughly decomposed. When the cement kiln is stopped, the deodorization system is started, and the deodorization system is used for treating odor extracted from the pretreatment workshop and the system treatment workshop and then is discharged after reaching the standard. As the content of potassium, sodium and chlorine elements in the household garbage is higher, a bypass air discharge system is needed to be arranged in order to ensure the normal operation of a cement clinker production line. Extracting part of high-temperature waste gas in the kiln tail smoke chamber through a bypass air outlet, mixing the waste gas with cold air blown by a cooling fan in a quenching chamber, cooling to about 350 ℃, and carrying out air separation through a cyclone separator, wherein coarse particles with low chlorine content return to the decomposing furnace to reduce the discharged ash content; the fine particles with high chlorine content are cooled to about 130 ℃ by a multi-tube cooler along with the airflow, and are discharged into the atmosphere after being purified by a bag type dust collector. And the dust collected by the multi-pipe cooler and the dust collector enters the dust deposition bin and is conveyed to a proportioning bin of the cement proportioning station by a canning vehicle through a loading system.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. A system for cooperatively treating urban and rural domestic garbage by a cement kiln is characterized by comprising a domestic garbage pretreatment system (1), a domestic garbage incineration system (2), a domestic garbage leachate treatment system (3), a deodorization system (4) and a bypass ventilation system (5), wherein the odorous air from the domestic garbage pretreatment system (1), the domestic garbage incineration system (2) and the domestic garbage leachate treatment system (3) is hermetically connected to the deodorization system (4) through an exhaust pipeline; percolate or process wastewater from a domestic garbage pretreatment system (1), a domestic garbage incineration system (2) and a deodorization system (4) is conveyed to a domestic garbage percolate treatment system (3) through a collection tank and a pipeline, the domestic garbage incineration system needs to be transformed and implanted into the existing cement clinker production line through thermal equipment, and a bypass air discharge system (5) is connected with the cement clinker production line through a thermal pipeline to extract part of high-temperature flue gas for sulfur, chlorine and alkali content control; the household garbage pretreatment system and the household garbage incineration system are main disposal links, and can be separately implemented or intensively implemented according to different construction conditions; the domestic garbage pretreatment system and the domestic garbage incineration system are matched to build a domestic garbage leachate treatment system and a deodorization system; the domestic garbage incineration system also needs to be matched with a bypass air discharge system, the domestic garbage leachate treatment system comprises an anaerobic treatment module denitrification module, a nitrification module, a cooling system plate, an ultrafiltration module, a nanofiltration module and a reverse osmosis module, the landfill leachate enters an underground leachate collection tank in a self-flowing mode, when the liquid level in the collection tank reaches a certain height, a sewage pump pumps the leachate into an adjusting tank of the anaerobic treatment module for leachate treatment, the deodorization system (4) comprises a wind gathering box (4-1), a deodorization fan (4-2), a water bath type dust removal device (4-3), a biological filter (4-4), a prewashing water tank (4-5), a sludge discharge tank (4-6), a spraying water tank (4-7), an active carbon tower (4-8) and a grate cooler cooling fan air pipe (4-9), the air collecting box (4-1) is sequentially connected with a water bath type dust removal device (4-3), a biological filter (4-4) and an active carbon tower (4-8) through a deodorization fan (4-2), a pre-washing water tank (4-5), a sludge discharge tank (4-6) and a spraying water tank (4-7) are arranged below the biological filter (4-4), and the air collecting box (4-1) is also connected with an air pipe (4-9) of a cooling fan of the grate cooler through an induced draft fan; the biological filter and the spraying water tank are connected in a sealing mode through an exhaust pipe, and a fan and an air collecting box are installed on the right side of the biological filter.
2. The system for the cement kiln to cooperatively dispose urban and rural domestic garbage according to claim 1, wherein the domestic garbage pretreatment system (1) comprises a mobile air compressor (1-1), a first grab bridge crane (1-2), a shear type crusher (1-3), a baffle flat belt conveyor (1-4), a second grab bridge crane (1-5), a dehydrator (1-6), a blanking steel bin (1-7), a third grab bridge crane (1-8), a belt type speed-regulating quantitative feeder (1-9), a tubular conveyor (1-10), garbage leachate (1-11), an original ecological garbage storage pit (1-12), a crushed garbage storage pit (1-13) and a dehydrated garbage storage pit (1-14), the household garbage is conveyed to an original ecological garbage storage pit (1-12) of a pretreatment workshop through a garbage transport vehicle, a movable air compressor (1-1) for cleaning the vehicle is arranged on one side of the garbage transport vehicle, then the household garbage is conveyed to a discharge hopper above a shear type crusher (1-3) through a first grab bucket bridge crane (1-2), and the household garbage is conveyed to a storage pit (1-13) through a belt conveyor (1-4) after being crushed; in the storage pit, the garbage is subjected to stack turning and forced ventilation by a second grab bucket bridge crane (1-5), the biological fermentation speed is increased, and the free water content is increased; after 5-10 days, the garbage is conveyed to a dehydrator (1-6) by a second grab bucket bridge crane (1-5) for extrusion dehydration and is conveyed to a blanking steel bin (1-7), is conveyed to a dehydrated garbage storage pit (1-14) by the blanking steel bin (1-7), and the garbage in the dehydrated garbage storage pit (1-14) is conveyed to a belt type speed-regulating quantitative feeder (1-9) by a third grab bucket bridge crane (1-8) and is conveyed to a household garbage incineration system by a tubular conveyor (1-10) for treatment.
3. The system for the cooperative disposal of urban and rural domestic garbage by using the cement kiln as claimed in claim 1, wherein the domestic garbage incineration system (2) comprises a three-way air-lock valve (2-1), a cold bin (2-2), a decomposing furnace (2-3), a four-stage cyclone cylinder (2-4), a hot plate furnace (2-5) and a cooling fan (2-6), a rubber belt conveyor is arranged above the three-way air-lock valve (2-1), the three-way air-lock valve and the hot plate furnace are hermetically connected through a blanking pipe, the cooling fan is arranged below the hot plate furnace, the hot plate furnace is also respectively connected with the decomposing furnace (2-3) and the four-stage cyclone cylinder (2-4), and the hot plate furnace is implanted after necessary reformation is carried out on a smoke chamber ascending to a flue decomposing furnace through a cement clinker production line, the domestic garbage entering the hot plate furnace is ignited and combusted in the hot plate furnace and then enters the cement kiln through the uptake flue for further incineration disposal.
4. The system for the cement kiln to cooperatively treat urban and rural domestic garbage according to claim 1, wherein the domestic garbage leachate treatment system (3) comprises an anaerobic treatment module (3-1), a denitrification module (3-2), a nitrification module (3-3), a cooling system module (3-4), an ultrafiltration module (3-5), a nanofiltration module (3-6) and a reverse osmosis module (3-7), the landfill leachate enters an underground leachate collection tank (1-11) in a self-flowing manner, when the liquid level in the collection tank reaches a certain height, a sewage pump pumps the leachate to a regulation tank of the anaerobic treatment module (3-1) for leachate treatment, and the leachate treatment is carried out through the denitrification module (3-2), the nitrification module (3-3), the cooling system module (3-4), Sludge and concentrated solution generated after the ultrafiltration module (3-5), the nanofiltration module (3-6) and the reverse osmosis module (3-7) are directly transported to a cement kiln for incineration disposal, so that the disposal cost of secondary waste is effectively reduced; the treated water is reused in a process system, and zero discharge of waste water is realized.
5. The system for the cement kiln to cooperatively dispose urban and rural domestic garbage according to claim 1, wherein the bypass air-bleeding system (5) comprises a bypass cyclone (5-1), a flue gas cooler (5-2), a dust collector (5-3), a second cooling fan (5-4) and an ash deposit bin (5-5), the second cooling fan (5-4) pumps out excessive potassium, sodium and chlorine gases, the excessive potassium, sodium and chlorine gases are discharged out of the cement clinker firing system through the bypass cyclone (5-1), the flue gas cooler (5-2) and the dust collector (5-3), and the cement clinker firing system can effectively reduce or avoid the skinning and caking of chlorine elements after a certain amount of gas is pumped out, the air-bleeding amount of the bypass air-bleeding system is determined by the chlorine content in garbage and the chlorine content in cement raw materials, and the flue gas cooler (5-2) is provided with a chlorine content determining function, The dust collector (5-3) is also connected with the dust deposition bin (5-5).
6. The system for the cement kiln cooperative disposal of urban and rural domestic garbage according to claim 1, wherein the concrete process flow is as follows: the method comprises the steps of feeding original ecological household garbage into an original ecological household garbage storage pit after the original ecological household garbage enters a factory, completing primary breaking operation through a grab bridge crane sequentially through a plate feeder and a shear type crusher to form garbage fragments with the granularity of 90% smaller than 200mm, periodically turning and stacking the garbage fragments through a grab, periodically blowing by a bottom blowing device and spraying percolate for biological drying treatment for 5-10 days, mechanically dehydrating the biochemically treated household garbage fragments sequentially through the grab bridge crane, the plate feeder and a dehydrator, feeding the dehydrated household garbage fragments into a finished product household garbage storage area, conveying the dehydrated household garbage fragments into a finished product garbage bin through the grab, conveying the household garbage into a pretreatment workshop through a garbage truck, unloading the household garbage storage pit to the garbage storage pit, conveying the household garbage to a plate feeder above the crusher through a travelling crane and the grab bucket, uniformly unloading the dried household garbage to the crusher, crushing the crushed household garbage by the crusher, and then feeding the household garbage into the storage pit, aerobic fermentation is carried out for 5-10 days in a storage pit, then the garbage is conveyed to a plate feeder above a dehydrator by a travelling crane and a grab bucket to be evenly fed to the dehydrator for extrusion dehydration, the dehydrated garbage falls on the plate feeder and then is conveyed into a discharging storage pit for short-term storage, the garbage is conveyed to the plate feeder above a finished product bin by the travelling crane and the grab bucket to be fed to a metering feeder, and then the garbage is conveyed to a hot plate furnace for incineration treatment by a belt type speed-regulating metering feeder and a tubular rubber belt conveyor; three air locking valves are arranged on the feeding pipeline of the hot plate furnace to prevent air leakage, and the safety gate valve can be immediately closed when the system is powered off or manually operated; garbage enters the hot plate furnace through a scraper-trough conveyer, high-temperature tertiary air from the grate cooler completely enters the hot plate furnace through a tertiary air pipe and is mainly used as a heat source for burning the garbage by the hot plate furnace, gas with the temperature of more than 1000 ℃ generated after the garbage in the hot plate furnace is burnt is introduced into a decomposing furnace and then is burnt together with coal powder, a certain amount of hot raw materials are shunted from an outlet of a four-stage cyclone cylinder and are fed into the hot plate furnace as an auxiliary heat supply or a decomposition heat absorption carrier, and the purpose of controlling the gas temperature of the hot plate furnace can be achieved by adjusting the amount of the hot raw materials; high-temperature gas generated by the hot plate furnace, combustion ash of waste materials, raw materials, small-particle sintering slag and the like enter the decomposing furnace, a small amount of large-particle sintering slag falls into the rotary kiln from a kiln tail ascending flue and is calcined into cement clinker by the rotary kiln system, and heavy metal harmful elements are dissolved in the clinker at the flame temperature of more than 1600 ℃ in a burning zone in the rotary kiln, so that the heavy metals cannot be leached and migrated to pollute the environment in the cement hydration process; the burned flue gas is sent into a decomposing furnace of the cement kiln, organic components are continuously decomposed or cracked through the decomposing furnace, so that toxic organic matters are thoroughly decomposed, and kiln tail waste gas is purified through a dust collecting system and is discharged from a chimney; the method comprises the following steps that garbage leachate in a garbage storage pit enters an underground leachate collecting tank in a self-flowing mode, and when the liquid level in the collecting tank reaches a certain height, a sewage pump pumps the leachate into a leachate treatment system regulating tank for leachate treatment; necessary anti-seepage measures are adopted at the bottom and the periphery of the garbage storage pit and the percolate collecting tank, so that seepage of percolate is prevented, and underground water is prevented from permeating; sludge and concentrated solution generated in the percolate treatment process are directly pumped into a cement kiln to be incinerated, so that the treatment cost of secondary waste is effectively reduced; the treated water is reused in a process system, so that zero discharge of wastewater is realized; the whole processes of the storage and transportation links of the garbage and the leachate treatment system are closed, and no waste gas is leaked; in the storage link, the pretreatment workshop adopts a full-sealing structure, and keeps a micro-negative pressure state to prevent odor from leaking; when the cement kiln normally operates, the odor from the pretreatment workshop and the cooperative treatment workshop is guided to the cement kiln grate cooler through the induced draft fan and is used as cooling air, volatile organic matters in the odor are combusted in the process of contacting with high-temperature clinker, and the combusted air is used as secondary air and is treated at high temperature of more than 1400 ℃ in the rotary kiln and more than 900 ℃ in the decomposing furnace, so that the odor is ensured to be thoroughly decomposed; when the cement kiln is stopped, starting a deodorization system, treating odor extracted from a pretreatment workshop and a system treatment workshop by the deodorization system, and then discharging the odor after reaching the standard; as the content of potassium, sodium and chlorine elements in the household garbage is higher, a bypass air discharge system is required to be arranged in order to ensure the normal operation of a cement clinker production line; extracting part of high-temperature waste gas in the kiln tail smoke chamber through a bypass air outlet, mixing the waste gas with cold air blown by a cooling fan in a quenching chamber, cooling to 350 ℃, and performing air separation through a cyclone separator, wherein coarse particles with low chlorine content return to the decomposing furnace to reduce the amount of discharged ash; the fine particles with high chlorine content are cooled to 130 ℃ by a multi-tube cooler along with the airflow, and are discharged into the atmosphere after being purified by a bag type dust collector; and the dust collected by the multi-pipe cooler and the dust collector enters the dust deposition bin and is conveyed to a proportioning bin of the cement proportioning station by a canning vehicle through a loading system.
7. The system for the cooperative disposal of urban and rural domestic garbage by the cement kiln as claimed in claim 6, wherein the deodorization system is used for sending the odor-containing air from the domestic garbage pretreatment system, the domestic garbage incineration system and the domestic garbage leachate treatment system through a sealed pipeline and a fan to the side of a cement kiln head cooler through the fan for the elimination and disposal of air for the cement production process during the normal operation of a matched cement production line, and sending the odor-containing air into a professional deodorization device for the purification treatment during the emergency.
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