CN116066832A - System for cement kiln is handled solid waste in coordination - Google Patents

System for cement kiln is handled solid waste in coordination Download PDF

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Publication number
CN116066832A
CN116066832A CN202310006847.XA CN202310006847A CN116066832A CN 116066832 A CN116066832 A CN 116066832A CN 202310006847 A CN202310006847 A CN 202310006847A CN 116066832 A CN116066832 A CN 116066832A
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China
Prior art keywords
chamber
air
subsystem
flue gas
grate
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Pending
Application number
CN202310006847.XA
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Chinese (zh)
Inventor
谢荣华
唐贺丰
***
刘佳明
韩广祥
张建
刘洋
冯凯
邹永志
路来光
鲁铜
赵智永
高严
宋宇
师瑞山
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Bbmg Hongshulin Environmental Protection Technology Co ltd
Nanjing Kesen Kenen Environment & Energy Co ltd
Tangshan Jidong Qixin Cement Co ltd
Original Assignee
Bbmg Hongshulin Environmental Protection Technology Co ltd
Nanjing Kesen Kenen Environment & Energy Co ltd
Tangshan Jidong Qixin Cement Co ltd
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Application filed by Bbmg Hongshulin Environmental Protection Technology Co ltd, Nanjing Kesen Kenen Environment & Energy Co ltd, Tangshan Jidong Qixin Cement Co ltd filed Critical Bbmg Hongshulin Environmental Protection Technology Co ltd
Priority to CN202310006847.XA priority Critical patent/CN116066832A/en
Publication of CN116066832A publication Critical patent/CN116066832A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/02—Separation 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
    • B01D53/06—Separation 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 with moving adsorbents, e.g. rotating beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • 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
    • F23G5/006—General arrangement of incineration plant, e.g. flow sheets
    • 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
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • 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
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00—Combustion
    • F23G2202/10—Combustion in two or more stages
    • F23G2202/103—Combustion in two or more stages in separate chambers
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to the technical field of garbage treatment, in particular to a system for cooperatively treating solid waste by a cement kiln, which comprises: the device comprises a garbage storage bin, a grate furnace, a waste heat boiler, a smoke purification subsystem, a grate cooler, a primary air subsystem and a secondary air subsystem. The toxic waste gas generated by the comprehensive solid waste incineration is purified by the flue gas purification subsystem and then is sent into the cement kiln grate cooler to be used as grate cooler cooling air, and the waste gas is heated by the grate cooler and then is used as tertiary air to enter the decomposing furnace, so that the toxic waste gas is preheated by the grate cooler as cooling air, the temperature of the tertiary air conveyed into the decomposing furnace is ensured, and the internal heat loss of the decomposing furnace is reduced; and the tertiary air is fully contacted with the high-temperature flue gas in the decomposing furnace, the combustion is continued in the decomposing furnace, the acidic toxic gas is absorbed by the alkaline raw material, the burning removal rate can reach 99.99%, and all toxic components can be treated and controlled.

Description

System for cement kiln is handled solid waste in coordination
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a system for cooperatively disposing solid waste by a cement kiln.
Background
The waste incineration is a main treatment mode of solid waste, and when the solid waste is incinerated, the generated flue gas contains pollutants, and the pollutants can be classified into four types of particles, acid gas, heavy metal and organic pollutants according to the properties of the pollutants, and the four types of substances have different degrees of harm to the environment according to the quantity and the properties of the four types of substances.
The prior patent CN209819549U discloses a cement kiln co-treatment garbage and power generation system, which utilizes the cement kiln to co-treat municipal solid waste, on one hand, odor and toxic substances in the garbage treatment process can be digested by utilizing a cement firing system, on the other hand, ash slag generated by garbage incineration can be used as a cement mixing material, and the toxic substances in the garbage can be decomposed into corresponding inorganic substances and heavy metals to be solidified in cement clinker; part of high-temperature waste gas generated by the cement kiln system can be used as a supplementary heat source or all heat sources for garbage incineration, so that the garbage incineration process is more sufficient, and the emission of dioxin is reduced; in actual production process, exhaust-heat boiler and tertiary air pipe connection in the current patent scheme, the tertiary air that comes out from the grate cooler gets into the decomposition furnace through the tertiary air pipe, and exhaust flue gas in the exhaust-heat boiler mixes together with the tertiary air and gets into the decomposition furnace simultaneously, and exhaust flue gas in the exhaust-heat boiler can reduce the temperature of tertiary air after mixing with the tertiary air, and this just leads to the temperature of the mixed gas in the decomposition furnace unstable, preheats the effect to the cement raw material in the decomposition furnace nonideal.
Disclosure of Invention
In view of the above problems, the embodiment of the invention provides a system for cooperatively disposing solid waste in a cement kiln.
In one aspect of the present invention, there is provided a system for co-disposal of solid waste in a cement kiln, comprising: a garbage storage bin, a grate furnace, a waste heat boiler, a smoke purification subsystem, a grate cooler, a primary air subsystem and a secondary air subsystem,
a garbage throwing chamber is arranged on one side wall of the garbage storage bin, a grab bucket is arranged at the top of the garbage storage bin, and a material dropping groove is arranged on the other side wall of the garbage storage bin; the feed inlet of the grate furnace is positioned below the feed chute; the waste heat boiler is communicated with the fire grate furnace and is used for generating steam by utilizing high-temperature flue gas discharged by the fire grate furnace; the flue gas purification subsystem is communicated with a flue gas outlet of the waste heat boiler, the flue gas purified by the flue gas purification subsystem is sent to the grate cooler, an outlet of a high-temperature section of the grate cooler is connected with the decomposing furnace, and an outlet of a medium-temperature section of the grate cooler is connected with the AQC boiler; the air inlets of the primary air subsystem and the secondary air subsystem are positioned at the top of the garbage storage bin, the air outlet of the primary air subsystem is connected with the primary air inlet of the grate furnace and the grate cooler, and the air outlet of the secondary air subsystem is connected with the secondary air inlet of the grate furnace.
Compared with the prior art, the invention has the beneficial effects that: the toxic waste gas generated by the comprehensive solid waste incineration is purified by the flue gas purification subsystem and then is sent into the cement kiln grate cooler to be used as grate cooler cooling air, and the waste gas is heated by the grate cooler and then is used as tertiary air to enter the decomposing furnace, so that the toxic waste gas is preheated by the grate cooler as cooling air, the temperature of the tertiary air conveyed into the decomposing furnace is ensured, and the internal heat loss of the decomposing furnace is reduced; and the tertiary air is fully contacted with the high-temperature flue gas in the decomposing furnace, the combustion is continued in the decomposing furnace, the acidic toxic gas is absorbed by the alkaline raw material, the burning removal rate can reach 99.99%, and all toxic components can be treated and controlled.
Optionally, the grate cooler is divided into 5 air chambers from a high temperature section, a middle temperature section and a low temperature section in sequence, wherein a1 chamber and a2 chamber are positioned in the high temperature section, a 3 chamber and a 4 chamber are positioned in the middle temperature section, a 5 chamber is positioned in the low temperature section, wherein the 2 chamber is divided into three sub-chambers of 2a, 2b and 2c, a sealing partition wall is arranged between the 2a chamber and the 2b chamber, a sealing partition wall is arranged between the 2b chamber and the 2c chamber and between the 2c chamber and the 3 chamber; the air outlet of the primary air subsystem is connected to the chamber 1 and the chamber 2a, and the flue gas purified by the flue gas purifying subsystem enters the chamber 2b and the chamber 2 c.
Optionally, the flue gas purification subsystem comprises a lime slaking bin, a lime slurry preparation tank, a lime slurry storage tank, a dry powder small hopper, a dry powder screw conveyor, an active carbon bin, an active carbon small hopper, an active carbon screw conveyor, a semi-dry deacidification reaction tower, a bag dust collector and an SCR denitration reactor;
the exhaust port of the waste heat boiler is connected with the air inlet of the semi-dry deacidification reaction tower, the air outlet at the side of the semi-dry deacidification reaction tower is connected with the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected with the air inlet of the SCR denitration reactor, and the air outlet of the SCR denitration reactor is connected to the grate cooler;
the bottom discharge port of the lime slaking bin is connected to a lime slurry making tank and a dry powder small hopper, the discharge port at the side part of the lime slurry making tank is connected to a lime slurry storage tank, and the slurry in the lime slurry storage tank is pumped to a semi-dry deacidification reaction tower through a slurry pump; the discharging hole at the bottom of the small dry powder hopper is connected with a dry powder screw conveyor, and dry powder in the dry powder screw conveyor is sent to a connecting pipeline between the semi-dry deacidification reaction tower and the bag dust collector through the air of a Roots blower;
the active carbon bin bottom discharge port is connected with an active carbon small hopper, the active carbon bottom discharge port is connected with an active carbon screw conveyor, and active carbon in the active carbon screw conveyor is sent to a connecting pipeline between the semi-dry deacidification reaction tower and the bag dust collector through the air of the Roots blower.
Optionally, the outlet of the low-temperature section of the grate cooler is connected with a dust remover, and the air outlet of the dust remover is connected with a chimney through an induced draft fan.
Optionally, a percolate outlet is arranged at the bottom of the garbage storage bin, and a percolate pool is arranged below the garbage storage bin.
Optionally, the primary air subsystem and the secondary air subsystem have the same structure and comprise a suction fan and an air preheater.
Optionally, a liquid collecting feeder connected with the blanking groove is arranged below the blanking groove, and the bottom of the liquid collecting feeder is connected to the garbage storage bin through a pipeline.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic structural diagram of a system for cooperatively disposing solid waste in a cement kiln according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grate cooler portion in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of a grate furnace according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a portion of a flue gas cleaning subsystem according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a primary air subsystem according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a secondary air subsystem according to an embodiment of the present invention.
The garbage storage bin 1, a grate furnace 2, a waste heat boiler 3, a grate cooler 4, a garbage throwing chamber 5, a grab bucket 6, a blanking groove 7, a slag extractor 8, a lime slaking bin 9, a lime slurry preparation tank 10, a lime slurry storage tank 11, a dry powder small hopper 12, a dry powder screw conveyor 13, an active carbon bin 14, an active carbon small hopper 15, an active carbon screw conveyor 16, a semi-dry deacidification reaction tower 17, a bag dust collector 18, an SCR denitration reactor 19, a slurry pump 20, a Roots blower 21, a dust remover 22, an induced draft fan 23, a chimney 24, a percolation liquid pool 25, a suction fan 26, an air preheater 27, a liquid collecting feeder 28, a first pneumatic valve 29, a steam heater 30, an ammonia spraying grid 31, a second pneumatic valve 32, a third pneumatic valve 33, a fourth pneumatic valve 34, a fifth pneumatic valve 35, a sixth pneumatic valve 36, a steel chimney 37, a sealing wind steam heater 38, a bin 39, a process water tank 40 and a sealing blower 41.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
Referring to fig. 1 to 6, the arrow direction in the drawing is the flue gas flow direction, and the system for cooperatively disposing solid waste in a cement kiln of the invention comprises: a garbage storage bin 1, a grate furnace 2, a waste heat boiler 3, a smoke purification subsystem, a grate cooler 4, a primary air subsystem and a secondary air subsystem,
a garbage throwing chamber 5 is arranged on one side wall of the garbage storage bin 1, a grab bucket 6 is arranged at the top of the garbage storage bin 1, and a blanking groove 7 is arranged on the other side wall of the garbage storage bin 1; the feed inlet of the grate furnace 2 is positioned below the feed chute 7; the waste heat boiler 3 is communicated with the grate furnace 2 and is used for generating steam by utilizing high-temperature flue gas discharged by the grate furnace 2; the flue gas purification subsystem is communicated with a flue gas outlet of the waste heat boiler 3, the flue gas purified by the flue gas purification subsystem is sent to the grate cooler 4, and particles carried in the flue gas can be removed through purification treatment so as to prevent blocking of a grate plate of the grate cooler, a high-temperature section outlet of the grate cooler 4 is connected with a decomposing furnace, and a middle-temperature section outlet of the grate cooler 4 is connected with an AQC boiler; the air inlets of the primary air subsystem and the secondary air subsystem are positioned at the top of the garbage storage bin 1, the air outlet of the primary air subsystem is connected with the primary air inlet of the grate furnace 2 and the grate cooler 4, and the air outlet of the secondary air subsystem is connected with the secondary air inlet of the grate furnace 2.
In practice, the bottom of the garbage storage bin 1 is placed under the ground so that the side garbage throwing chamber 6 is positioned on the ground, garbage conveyed by the garbage truck is discharged into the garbage storage bin 1 through the garbage throwing chamber 5, and the decomposing furnace and the AQC boiler are conventional equipment in the existing cement kiln system, wherein the AQC boiler is also called a kiln head boiler.
Slag generated by burning the grate furnace 2 is discharged into a slag extractor 8, and the slag is extinguished and cooled by water in the slag extractor 8; the waste heat boiler 3 adopts a conventional single-drum natural circulation mode and consists of three vertical membrane type water-cooled wall channels (a first vertical membrane type water-cooled wall channel H, a second vertical membrane type water-cooled wall channel I and a third vertical membrane type water-cooled wall channel J) and a vertical steel flue K which are sequentially connected, wherein the first vertical membrane type water-cooled wall channel H is connected with a smoke outlet of a combustion chamber in the grate furnace 2, and the vertical steel flue K is connected to the smoke purification subsystem 4.
The grate cooler 4 is divided into 5 air chambers from a high temperature section to a low temperature section in sequence, wherein a1 chamber and a2 chamber are in a high temperature section, a 3 chamber and a 4 chamber are in a medium temperature section, and a 5 chamber is in a low temperature section, wherein the 2 chamber is divided into three sub-chambers of 2a, 2b and 2c, a sealing partition wall is arranged between the 2a chamber and the 2b chamber, between the 2b chamber and the 2c chamber, and between the 2c chamber and the 3 chamber, and meanwhile, a sealing fan 41 is added for supplying sealing air of the sealing partition wall, and the sealing air is blown along the wall surface of the sealing partition wall; the air outlet of the primary air subsystem is connected to the chamber 1 and the chamber 2a, and the flue gas pretreated by the flue gas purifying subsystem enters the chamber 2b and the chamber 2 c.
Part of odor in the garbage storage bin 1 is taken as primary air, enters the grate furnace 2 to participate in combustion, and the other part of odor enters the 1 chamber and the 2a chamber of the grate cooler 4 to be taken as cooling air; the flue gas generated by the incineration of the grate furnace 2 enters the chambers 2b and 2c as cooling air to be heated and then enters the decomposing furnace as tertiary air, and fully contacts with high-temperature flue gas in the decomposing furnace to continue burning in the decomposing furnace.
The flue gas purification subsystem comprises a lime hydrate bin 9, a lime hydrate preparation tank 10, a lime hydrate storage tank 11, a dry powder small hopper 12, a dry powder screw conveyor 13, an active carbon bin 14, an active carbon small hopper 15, an active carbon screw conveyor 16, a semi-dry deacidification reaction tower 17, a bag dust collector 18 and an SCR denitration reactor 19;
the exhaust port of the waste heat boiler 3 is connected with the air inlet of the semi-dry deacidification reaction tower 17, the air outlet at the side of the semi-dry deacidification reaction tower 17 is connected with the air inlet of the bag dust collector 18, the air outlet of the bag dust collector 18 is connected with the air inlet of the SCR denitration reactor 19, and the air outlet of the SCR denitration reactor 19 is connected to the grate cooler 4; in implementation, a communication pipeline is connected between an air inlet pipeline and an air outlet pipeline of the SCR denitration reactor 19, a first pneumatic valve 29 is arranged on the communication pipeline, a steam heater 30 and an ammonia spraying grid 31 are sequentially arranged on the air inlet pipeline of the SCR denitration reactor 19 and are respectively used for heating gas in the pipeline and spraying ammonia into the pipeline, the steam heater 30 is used for providing steam by a steam main pipe, and generated condensed water is discharged by a sewage main pipe; the air inlet pipeline of the SCR denitration reactor 19 is provided with a second pneumatic valve 32 and a third pneumatic valve 33 respectively positioned at the front side of the steam heater 30 and at the rear side of the ammonia injection grid 31, the air outlet pipeline of the SCR denitration reactor 19 is provided with a fourth pneumatic valve 34, and when the first pneumatic valve 29 is closed, the second pneumatic valve 32, the third pneumatic valve 33 and the fourth pneumatic valve 34 are all opened, the SCR denitration reactor 19 is put into use; the air outlet pipeline of the SCR denitration reactor 19 can be divided into two branch pipelines through three-way, a fifth pneumatic valve 35 and a sixth pneumatic valve 36 are respectively arranged on the two branch pipelines, and when the cement kiln parts do not work cooperatively, the sixth pneumatic valve 36 is closed, the fifth pneumatic valve 35 is opened, and the purified flue gas is directly discharged from a steel chimney 37; each pneumatic valve is supplied with driving gas by a pneumatic sealing fan, and the driving gas is preheated by a sealing wind steam heater 38 and then supplied to each pneumatic valve; the materials discharged from the discharge ports at the bottoms of the semi-dry deacidification reaction tower 17 and the bag dust collector 18 are conveyed to a fly ash bin 39 through a scraper and a bucket elevator, and the fly ash in the fly ash bin 39 is made into mortar and then is put into a decomposing furnace to be used as cement production raw materials.
The bottom discharge port of the lime slaking bin 9 is connected to a lime slurry making tank 11 and a dry powder small hopper 12, compressed air can be introduced into the bottom of the lime slaking bin 9 to prevent slaking during production, the discharge port at the side part of the lime slurry making tank 11 is connected to a lime slurry storage tank 11, and slurry in the lime slurry storage tank 11 is pumped to a semi-dry deacidification reaction tower 17 through a slurry pump 20; lime slurry is sprayed in a mist form in the semi-dry deacidification reaction tower 17 to realize deacidification, a process water tank 40 can be further arranged for assisting in spraying the lime slurry, a process water pump in the process water tank 40 is pumped to the semi-dry deacidification reaction tower 17, and compressed air is introduced into the semi-dry deacidification reaction tower 17 while process water is pumped, so that the specific process of the existing spraying process is not repeated here.
The discharge hole at the bottom of the small dry powder hopper 12 is connected with a dry powder screw conveyor 13, and lime dry powder in the dry powder screw conveyor 13 is sent to a connecting pipeline between the semi-dry deacidification reaction tower 17 and the bag dust collector 18 through the air of a Roots blower 21;
the bottom discharge port of the activated carbon bin 14 is connected with an activated carbon small hopper 15, the bottom discharge port of the activated carbon small hopper 15 is connected with an activated carbon screw conveyor 16, and activated carbon powder in the activated carbon screw conveyor 16 is sent to a connecting pipeline between the semi-dry deacidification reaction tower 17 and the bag dust collector 18 through the air of a Roots blower 21.
The outlet of the low-temperature section of the grate cooler 4 is connected with a dust remover 22, and the outlet of the dust remover 22 is connected with a chimney 24 through a draught fan 23.
The bottom of the garbage storage bin 1 is provided with a percolate outlet, and a percolate pool 25 is arranged below the garbage storage bin 1; a drainage pump is provided in the percolate tank 25 for draining percolate in the percolate tank 25 to an existing sewage treatment system for treatment.
The primary air subsystem and the secondary air subsystem have the same structure and comprise a suction fan 26 and an air preheater 27; wherein, the air sucked by the suction fan 17 in the primary air subsystem is preheated by the air preheater 18 and then connected to the primary air inlets of A1 (A2), B1 (B2), C1 (C2) and D1 (D2) of the air chambers at the bottom of the grate furnace 2 through a plurality of branch air pipes; air sucked by a suction fan 26 in the secondary air subsystem is preheated by an air preheater 27 and then connected to E1 and F1 secondary air inlets of a combustion chamber at the top of the grate furnace 2 through a plurality of branch air pipes, and an electric control valve FV is arranged on each branch air pipe for controlling on-off.
A liquid collecting feeder 28 connected with the liquid collecting feeder 28 is arranged below the material dropping groove 7, the bottom of the liquid collecting feeder 28 is connected to the garbage storage bin 1 through a pipeline, and the liquid collecting feeder 28 is used for collecting liquid which is filtered out from solid waste in the feeding process and returning the liquid to the garbage storage bin 1.
In the treatment process, the grab bucket 6 grabs solid wastes stacked in the garbage storage bin 1 into the blanking groove 7, the solid wastes are sent into the grate furnace 2 through the blanking groove 7 to be burnt, the odor sucked by the primary air subsystem is sent to the bottom air chamber of the grate furnace 2 and the 1 chamber and the 2a chamber of the grate cooler 4 to be used as cooling air, and the odor sucked by the secondary air is sent to the combustion chamber at the top of the grate furnace 2 to support combustion; the high-temperature flue gas generated by the combustion of the grate furnace 2 enters the waste heat boiler 3, the high-temperature flue gas sequentially enters the flue gas purification subsystem through a first vertical membrane water-cooled wall channel H, a second vertical membrane water-cooled wall channel I, a third vertical membrane water-cooled wall channel J and a vertical steel flue K in the waste heat boiler 3, the flue gas purified by the flue gas purification subsystem enters the chambers 2b and 2c of the grate cooler 4 and enters the decomposing furnace through a high-temperature outlet after being heated by the grate cooler as cooling air, the temperature of the flue gas entering the decomposing furnace is ensured, the flue gas is fully contacted with the high-temperature flue gas in the decomposing furnace, the flue gas is continuously combusted in the decomposing furnace, the acid toxic gas is absorbed by alkaline raw materials, the destruction removal rate can reach 99.99%, and all toxic components can be treated and controlled.
Recording production data in actual production of the prior patent and the scheme, converting the production data into production data under the same capacity according to a conventional calculation process, and specifically obtaining the production data of the prior patent CN209819549U shown in the following table 1 and the production data under the same capacity of the scheme, wherein the cost reduction of a cement line per ton clinker in the application is 11.07 which is far higher than that of the prior patent; the price of the standard coal adopted in the calculation is 1000 yuan/t, and the electricity cost is 0.6 yuan/kwh;
Figure BDA0004037322520000061
Figure BDA0004037322520000071
table production data comparison
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A system for co-disposing of solid waste in a cement kiln, comprising: the garbage storage bin, the grate furnace, the waste heat boiler, the smoke purification subsystem, the grate cooler, the primary air subsystem and the secondary air subsystem are characterized in that,
a garbage throwing chamber is arranged on one side wall of the garbage storage bin, a grab bucket is arranged at the top of the garbage storage bin, and a material dropping groove is arranged on the other side wall of the garbage storage bin; the feed inlet of the grate furnace is positioned below the feed chute; the waste heat boiler is communicated with the fire grate furnace and is used for generating steam by utilizing high-temperature flue gas discharged by the fire grate furnace; the flue gas purification subsystem is communicated with a flue gas outlet of the waste heat boiler, the flue gas purified by the flue gas purification subsystem is sent to the grate cooler, an outlet of a high-temperature section of the grate cooler is connected with the decomposing furnace, and an outlet of a medium-temperature section of the grate cooler is connected with the AQC boiler; the air inlets of the primary air subsystem and the secondary air subsystem are positioned at the top of the garbage storage bin, the air outlet of the primary air subsystem is connected with the primary air inlet of the grate furnace and the grate cooler, and the air outlet of the secondary air subsystem is connected with the secondary air inlet of the grate furnace.
2. The system for cooperatively disposing solid waste in a cement kiln according to claim 1, wherein the grate cooler is divided into 5 air chambers from a high temperature section, a middle temperature section to a low temperature section in sequence, wherein a1 chamber and a2 chamber are positioned in the high temperature section, a 3 chamber and a 4 chamber are positioned in the middle temperature section, and a 5 chamber is positioned in the low temperature section, wherein the 2 chamber is divided into three sub-chambers 2a, 2b and 2c, a sealing partition wall is arranged between the 2a chamber and the 2b chamber, between the 2b chamber and the 2c chamber, and between the 2c chamber and the 3 chamber; the air outlet of the primary air subsystem is connected to the chamber 1 and the chamber 2a, and the flue gas purified by the flue gas purifying subsystem enters the chamber 2b and the chamber 2 c.
3. The system for co-disposal of solid waste in a cement kiln of claim 1, wherein the flue gas purification subsystem comprises a lime slaking bin, a lime slurry preparation tank, a lime slurry storage tank, a dry powder small hopper, a dry powder screw conveyor, an activated carbon bin, an activated carbon small hopper, an activated carbon screw conveyor, a semi-dry deacidification reaction tower, a bag dust collector and an SCR denitration reactor;
the exhaust port of the waste heat boiler is connected with the air inlet of the semi-dry deacidification reaction tower, the air outlet at the side of the semi-dry deacidification reaction tower is connected with the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected with the air inlet of the SCR denitration reactor, and the air outlet of the SCR denitration reactor is connected to the grate cooler;
the bottom discharge port of the lime slaking bin is connected to a lime slurry making tank and a dry powder small hopper, the discharge port at the side part of the lime slurry making tank is connected to a lime slurry storage tank, and the slurry in the lime slurry storage tank is pumped to a semi-dry deacidification reaction tower through a slurry pump; the discharging hole at the bottom of the small dry powder hopper is connected with a dry powder screw conveyor, and dry powder in the dry powder screw conveyor is sent to a connecting pipeline between the semi-dry deacidification reaction tower and the bag dust collector through the air of a Roots blower;
the active carbon bin bottom discharge port is connected with an active carbon small hopper, the active carbon bottom discharge port is connected with an active carbon screw conveyor, and active carbon in the active carbon screw conveyor is sent to a connecting pipeline between the semi-dry deacidification reaction tower and the bag dust collector through the air of the Roots blower.
4. The system for cooperatively disposing solid waste in a cement kiln according to claim 1, wherein the outlet of the low-temperature section of the grate cooler is connected with a dust remover, and the air outlet of the dust remover is connected with a chimney through a draught fan.
5. The system for co-disposal of solid waste in a cement kiln according to claim 1, wherein a percolate outlet is provided at the bottom of the waste storage bin and a percolate pool is provided below the waste storage bin.
6. The system for co-disposal of solid waste in a cement kiln of claim 1, wherein the primary air subsystem and the secondary air subsystem are identical in structure and comprise a suction fan and an air preheater.
7. A system for co-disposal of solid waste in a cement kiln according to claim 1, characterized in that a liquid collecting feeder connected to the blanking tank is arranged below the blanking tank, and the bottom of the liquid collecting feeder is connected to the garbage storage bin through a pipeline.
CN202310006847.XA 2023-01-04 2023-01-04 System for cement kiln is handled solid waste in coordination Pending CN116066832A (en)

Priority Applications (1)

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CN202310006847.XA CN116066832A (en) 2023-01-04 2023-01-04 System for cement kiln is handled solid waste in coordination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310006847.XA CN116066832A (en) 2023-01-04 2023-01-04 System for cement kiln is handled solid waste in coordination

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CN116066832A true CN116066832A (en) 2023-05-05

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