CN104033905B - System for combustible waste co-processing in cement kiln with bypass exhaust and waste heat power generation - Google Patents

System for combustible waste co-processing in cement kiln with bypass exhaust and waste heat power generation Download PDF

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Publication number
CN104033905B
CN104033905B CN201410284453.1A CN201410284453A CN104033905B CN 104033905 B CN104033905 B CN 104033905B CN 201410284453 A CN201410284453 A CN 201410284453A CN 104033905 B CN104033905 B CN 104033905B
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kiln
waste
kiln tail
heat boiler
waste heat
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CN104033905A (en
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杨义军
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Fujian Longlin Environmental Engineering Co ltd
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Tianjin Weizhe Energy-Saving Environmental Protection Technology Development Co Ltd
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    • 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/12Heat utilisation in combustion or incineration of waste
    • 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
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency
    • 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

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  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a system for combustible waste co-processing in cement kiln with bypass exhaust and waste heat power generation and aims to provide a system with high ability to process the combustible waste and guarantee production quality of the cement. The technical scheme includes that the system comprises a generating device, a kiln tail preheater, a kiln head waste heat boiler, a kiln tail waste heat boiler, a collecting device, an incinerator, a raw material vertical mill and a bypass exhaust device; the kiln head waste heat boiler and the kiln tail waste heat boiler are connected with the generating device, a gas inlet of the kiln head waste heat boiler is connected with a waste gas outlet of a clinker cooler, a waste gas outlet of the kiln tail preheater is connected with a gas inlet of the kiln tail waste heat boiler, and a discharging outlet of the kiln tail preheater is connected with a feeding inlet of a feed-end chamber of a rotary kiln; and a smoke outlet of the incinerator is connected to a decomposing boiler of the kiln tail preheater.

Description

Can bypass cogeneration cement kiln work in coordination with process combustible waste material system
Technical field
The present invention relates to a kind of combustible waste material system, specifically a kind of cement kiln is collaborative to process combustible waste material system.
Background technology
Combustible waste material refer to the mankind produce, consumption, life and other activities in produce have certain calorific value and (external definition is then more extensive, and it is useless that animal activity produces for the solid-state that can burn under certain condition, semisolid discarded object matter Gurry falls within such), it is exactly generally " rubbish " of calorific value.Combustible waste material mainly includes domestic waste, the village Family's straw, mud, discarded plastics or rubber, damaged wood furniture, spoil, rotten food, human and animal excreta etc. Deng.
European Union, in terms of processing the combustible waste materials such as domestic waste, mud, had and changed several times: be initially just to fill out Based on burying and burning, the lime-ash after burning is also landfilled;The later stage nineties there occurs that several refuse landfill penetrating fluids are let out in succession Leakage accident, then they revise and the antiseep standards and guidelines of landfill yard are greatly improved;So experienced 6~8 Year, European Union finds that remedial measure cost that they are taken is too high and produces effects less it is impossible to the hidden danger of radical cure secondary pollution;Through Cautiously and painfully introspect and prove, 2007 so far, moral, Ying Deng state have made new decision-making finally in succession, no longer newly-built flammable Waste and city life garbage landfill and incinerator factory;The combustible waste of all from now on new generations and rubbish will take other Safer more economical method, all immediately disposes as much as possible, settles at one go, dissolves clean, does not stay future trouble, as far as possible few with or Without landfill yard and incinerator, explore the aspects such as anaerobic composting, regenerable solid fuel manufacture, exploitation bio-fuel, simultaneously to water Bricklayer's's industry dissolve combustible waste prospect also rather good.
The present situation of domestic combustible waste material is, because the combustible waste material yield such as domestic city house refuse is big, to determine China's offal treatment certain it is however emphasized that " volume reduction ", through groping and practice of over half a century, domestic at present to flammable useless The main method that gurry is processed is exactly to burn.This method one can accomplish minimizing, the combustible waste material single firing on such as mountain it; Two can achieve resource, and combustible waste material is used as the energy to generate electricity.Therefore the whole nation from the leadership to the masses big and medium-sized cities are all big Amount builds the burning power station of the combustible waste materials such as rubbish, straw, mud, and indivedual province has started to be used for landfill in the past Rubbish again dig out single firing it.
The advanced countries such as America and Europe have begun to abandon burn after landfill processing mode, at home but following the track of the overturned cart, that What the drawbacks of waste incineration is?Think through research, combustible waste material burns and do not enable the innoxious of offal treatment It is the fatal disadvantage that combustible waste material burns.Why waste incineration is harmful to, and is because domestic rubbish the like waste does not have Sorting mechanism, domestic waste rubbish water content many more than 35%, in the burning of conventional grate furnace or fluid bed furnace etc. During due to needing to heat up, removing moisture removal, and can not burn rapidly, certainly exist one 200-500 DEG C of temperature space, belong to Middle low temperature burns, and in the presence of chloride (as plastic bag) is a large amount of, burning process just becomes a large amount of manufacture two English Process.Current garbage burning factory is all first to manufacture two English, then by spraying into the pattern that activated carbon etc. is adsorbed.This is just For two English, convenience is opened to the pollution of environment and murder by poisoning, wherein have the accident leakage of flue gas to cause two English to enter ring The reason border, the operating cost such as more active charcoal is high and have Some Enterprises to steal caused by row puts steathily.
Process combustible waste material worked in coordination with by cement kiln suitable advantage, and its natural stable hot environment can utterly destroy two English, natural alkaline environment can neutralize sour gas, curing heavy metal, the component of rubbish and lime-ash and cement raw material class simultaneously Seemingly, also can be by rubbish " eating clean ", investment is minimum with processing cost, technological means are flexible.
Cement kiln work in coordination with process combustible waste material can bring a large amount of impact cement qualities harmful components (as potassium, sodium, chlorine, Sulfur etc.), the ability that process combustible waste material worked in coordination with by cement kiln on the premise of not affecting cement quality at present is limited;Cause This, work in coordination with, in order to improve cement kiln, the ability processing combustible waste material, some technology employ the method for bypass, but bypass Leak informaton and can bring extra energy loss, so the amount of leaking informaton typically can control exports total exhaust gas volumn 5%-10% in kiln tail, also omit Inadequate.
Content of the invention
The purpose of the present invention is to overcome the shortcomings of in above-mentioned background technology, provide can bypass cogeneration cement kiln Collaborative process combustible waste material system, this system should have higher combustible waste material disposal ability, can guarantee that cement simultaneously The quality of production.
The technical scheme is that can bypass cogeneration cement kiln work in coordination with process combustible waste material system, Including TRT, kiln tail preheater, kiln hood waste heat boiler and kiln tail waste heat boiler;Kiln hood waste heat boiler and kiln tail waste heat boiler TRT is connected by steam circuit, the air inlet of kiln hood waste heat boiler connects the waste gas outlet of chamotte cooler, kiln The discharging opening of air inlet and kiln tail preheater that the waste gas outlet of tail preheater connects kiln tail waste heat boiler connects kiln in rotary kiln The charging aperture of tail smoke-box;
It is characterized in that: this system also includes for housing combustible waste material and combustible waste material being delivered to incinerator Collection device, for burning disposal combustible waste material incinerator, for process incinerator produce lime-ash raw material roller mill and For drawing the bypass device of kiln tail smoke-box waste gas;The exhanst gas outlet of described incinerator accesses the dore furnace of kiln tail preheater In;
Described collection device is configured with and ferments catalysis and the heat exchanger dried for combustible waste material, chamotte cooler useless Gas outlet accesses chimney to discharge waste gas after being sequentially connected heat exchanger and bypass air-introduced machine;
In described bypass device, kiln tail smoke-box is sequentially connected equipment for denitrifying flue gas, air preheat by taking wind pipeline The air inlet of kiln tail waste heat boiler is accessed after device, hot precipitator, quenching apparatus, bypass waste gas dust settler.
Described collection device includes rubbish and receives storehouse, sludge treatment equipment or/straw reception storehouse.
The mud that described sludge treatment equipment includes sequentially connecting receives the mud feed of storehouse, wet mud storehouse, conveying mud Pump and the desiccation machine that mud is dried, the waste steam condensation device of discharge after also including the exhaust steam in collection desiccation machine and condensing; Described desiccation machine accesses in steam circuit to obtain sludge drying institute calorific requirement.
This system also includes the purifying processing device for the gas of collection device inputs incinerator;Purifying processing device In, the gas that rubbish receives in storehouse or/sludge treatment equipment accesses after air supply duct connects aerator and air preheater Burning disposal in incinerator, the exhaust gases passes of air preheater are sent into and are taken airduct between equipment for denitrifying flue gas and hot precipitator To introduce the heat of high-temperature flue gas in road.
Described incinerator is grate type incinerator or fluidized bed incinerator.
Described straw receives in storehouse and is provided with pulverizer.
The invention has the beneficial effects as follows:
1) house refuse and combustible waste material only need to simply sort and can send into incinerator burning, decrease early stage as far as possible The link processing, thus current cost before saving;
2) make full use of the existing residual heat resources of cement kiln, the air draft heat of tail bypass wind discharging exhaust-heat boiler is used for garbage and sends out Ferment catalysis and drying, so that combustible waste material more easy firing;
3) in refuse collection storehouse, combustible waste material goes out " foul smell " of generation and just sends into incinerator after system heating, thus Thoroughly eliminate stink and effectively improve flame temperature;
4) in combustible waste material, sewage oozes out into cesspool, sends into sewage water tank after filtering, and its main component is organic Thing, has thermolability, is burnt after sewage lifting, irregularly sending into cement kiln head using special pump, reduces at sewage The investment (relevant device is conventional equipment, and in figure is omitted) of reason system and equipment;
5) in incinerator, the lime-ash such as the slag of generation, flying dust all sends into raw material roller mill, eventually becomes substitutive raw material of cement (every Ton garbage about can produce alternative materials 90-130kg), and heavy metal pollution is thoroughly eliminated by the solidification of cement;
6) due in rotary kiln dore furnace flue-gas temperature reach more than 850 DEG C, can effectively avoid the formation temperature of two English, Two English are possibly eliminated greatly;
7) sulfur brought in crude fuel and combustible waste material, chlorine, potassium, sodium part are drawn by bypass device, effectively Ensure that cement clinker quality is not affected by these harmful components;
8) heat smoke of bypass device is generated electricity after waste heat boiler, can effectively be lifted generated energy 20% with On;
9) after adopting the present invention, the yield of clinker is constant, heat consumption is constant (also has because combustible waste material forms difference May reduce heat consumption), power consumption constant, no any adverse effect to cement clinker production line;
10) present invention is simple, burn electric power station system with traditional combustible waste material compared with reduce investment outlay about 50%.
Brief description
Fig. 1 is the structural representation of the present invention.
In figure label declaration: more than rotary kiln 1, kiln tail preheater 2, chamotte cooler 3, dore furnace 4, kiln tail smoke-box 5, kiln tail Heat boiler 7 (sp), kiln hood waste heat boiler 8 (aqc), kiln tail high-temperature blower 11, aerator 12, TRT 13, wet mud storehouse 14, Mud feed pump 15, desiccation machine 16, waste steam condensation device 17, incinerator 18, raw material roller mill 19, air preheater 20, heat exchanger 21st, mud receive storehouse 22, rubbish receive storehouse 23, straw receive storehouse 24, pulverizer 25, equipment for denitrifying flue gas 29, raw mill 111, Dust-precipitator 112 and conditioning Tower 113, steam conveying pipeline 51 (steam conveying pipeline 51 and the condensate line group being back to boiler Become steam circuit;In figure omit condensate line), take wind pipeline 52, air supply duct 53, hot precipitator 9, quenching apparatus 10th, bypass waste gas dust settler 6, bypass air-introduced machine 30, chimney 26.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described, but the invention is not limited in following examples.
As shown in figure 1, can bypass cogeneration cement kiln work in coordination with process combustible waste material system, include generate electricity fill Put 13, kiln tail preheater 2, kiln hood waste heat boiler 8, kiln tail waste heat boiler 7, be used for housing combustible waste material and by combustible waste material It is delivered to the collection device of incinerator, be used for the incinerator 18 of burning disposal combustible waste material, be used for processing incinerator generation ash The raw material roller mill 19 of slag, for drawing the bypass device of kiln tail smoke-box waste gas and for by the input of the air of collection device The purifying processing device of incinerator.
In described rotary kiln 1, the charging aperture of kiln tail smoke-box 5 connects the discharging opening of kiln tail preheater, the waste gas of kiln tail preheater Outlet connects the air inlet of kiln tail waste heat boiler, and kiln tail waste heat boiler connects TRT by steam circuit;More than kiln tail The gas outlet of heat boiler is connected with raw mill 111, dust-precipitator 112 and conditioning Tower 113 by kiln tail high-temperature blower 11, and kiln tail preheats The waste gas outlet of device is connected with raw mill, dust-precipitator and conditioning Tower also by another pipeline;Kiln tail preheater includes dore furnace 4 And cyclone cylinder c1, c2, c3, c4 of plural serial stage (waste gas outlet of cyclone cylinder c1 is connected the air inlet of kiln tail waste heat boiler with c5 Mouthful, and be connected with raw mill, dust-precipitator and conditioning Tower by another pipeline).
The waste gas outlet of described chamotte cooler connects the air inlet of kiln hood waste heat boiler, and kiln hood waste heat boiler passes through steam Closed circuit connects TRT;The waste gas outlet of chamotte cooler is sequentially connected heat exchanger and is followed by with bypass air-introduced machine 30 Enter chimney 26 to discharge waste gas;(this heat exchanger is used for the fermentation catalysis of combustible waste material and dries).
Described incinerator is grate type incinerator or fluidized bed incinerator, and the exhanst gas outlet of incinerator accesses kiln tail preheating In the dore furnace of device.
In described bypass device, kiln tail smoke-box is sequentially connected equipment for denitrifying flue gas 29, air by taking wind pipeline 52 Kiln is accessed after preheater 20 (high-temperature flue gas releasing heat), hot precipitator 9, quenching apparatus 10, bypass waste gas dust settler 6 The air inlet (jointly accessing kiln tail waste heat boiler with the waste gas outlet of kiln tail preheater) of tail waste heat boiler.
Described collection device be configured with for combustible waste material ferment catalysis and dry heat exchanger (mud receive storehouse 22, Rubbish receives storehouse 23, straw receives in storehouse 24 and is each equipped with heat exchanger);Described collection device includes rubbish and receives storehouse 23, mud Processing meanss or/straw receive storehouse 24;Described straw receives in storehouse and is provided with pulverizer 25;Described sludge treatment equipment is included sequentially The mud of connection receives storehouse 22, wet mud storehouse 14, the mud in wet mud storehouse is delivered to the mud feed pump 15 of desiccation machine, is dried The desiccation machine 16 of mud, waste steam condensation device 17 is collected the exhaust steam in desiccation machine and is discharged after condensing;Useless from desiccation machine Steam enters in waste steam condensation device and carries out cooling process;The cooling water that waste steam condensation device adopts, can be the dirt of Sewage Plant Water (waste water of Sewage Plant flows in waste steam condensation device, returns Sewage Plant after taking away the heat of exhaust steam), or tap water (for using water wisely, be preferably configured cooling tower and form cooling water recirculation system);Exhaust steam after heat release cooling then enters purification Processing meanss continue with.
Described desiccation machine accesses in steam circuit;Mud in wet mud storehouse is transported to desiccation machine by mud feed pump Middle process, the energy needed for mummification is derived from the mixed vapour of two boilers, produces dewatered sludge defeated by mud feed pump after mummification Deliver in incinerator and burn, the condensate producing after mummification returns TRT.
In described purifying processing device, the gas that rubbish receives in storehouse or/sludge treatment equipment passes through air supply duct 53 even Connect aerator 12 and air preheater 20 (GAS ABSORPTION heat) accesses in incinerator afterwards and carries out combustion-supporting, the flue gas of air preheater Passage sends into taking in wind pipeline to introduce the heat of high-temperature flue gas between equipment for denitrifying flue gas and hot precipitator.
Taking the cement clinker production line of 2800 tons of one, certain company daily output as a example:
1st, combustible waste material is transported in collection device and (includes rubbish and receive storehouse, sludge treatment equipment or the reception of/straw Storehouse), then collection device is delivered to nearly 300 tons daily of combustible waste material in incinerator by mechanical conveying equipment and is burned;
2nd, after combustible waste material burns in incinerator, generation temperature is 700-1000 DEG C, exhaust gas volumn is 22000nm3/h Heat smoke be admitted in dore furnace, the lime-ash of generation is sent to raw material roller mill;
(exhaust gas volumn accounts for the 30-60% of kiln tail preheater, flue gas temperature by the high alkalinity flue gas of kiln tail smoke-box to take wind pipeline Degree be not less than 900 DEG C) be sequentially sent to equipment for denitrifying flue gas, air preheater, hot precipitator, quenching apparatus, bypass give up Gas dust settler, kiln tail waste heat boiler;
The exhaust gas volumn producing after incinerator incineration of combustible garbage and the exhaust gas volumn substantially phase entering in bypass device Deng being balanced with the flue gas keeping dore furnace;The flue gas taking wind pipeline when air preheater, will from rubbish receive storehouse or/ It is transported in incinerator after the air preheat of sludge treatment equipment;
The waste gas that chamotte cooler is discharged also inputs in the heat exchanger of collection device, for flammable useless in collection device Gurry carries out fermentation catalysis and dries, and by bypass waste gas air-introduced machine by waste gas suction smoke stack emission;
3rd, the steam that kiln hood waste heat boiler and kiln tail waste heat boiler produce jointly is sent in the steam turbine of TRT and is carried out Generate electricity;The lime-ash that bypass waste gas dust settler, kiln hood waste heat boiler and kiln tail waste heat boiler are discharged sends into raw material roller mill;High temperature It is transmitted back to raw material storage (cement raw material storehouse) after the lime-ash cooling that cleaner unit is discharged.
The effect of the present invention is:
1st, the present invention is substantially improved the exhaust gas volumn (increasing to 30-60%) of bypass, and the hot cigarette that bypass is extracted Gas is used for cogeneration;
2nd, by chamotte cooler, flue gas out is introduced in the heat exchanger of collection device the present invention, thus to combustible waste material Heated, improve the combustibility of combustible waste material,
3rd, in order to improve the efficiency of combustion of garbage further, the present invention also burns in the setting in wind pipeline that takes of bypass Burn the air preheater required for stove, pathogenic wind-warm can be brought up to 200-300 DEG C.
4th, because cement kiln bypass can bleed off substantial amounts of harmful components, ensure that cement kiln has bigger space To receive more combustible waste materials, the flue gas that bypass is drawn is used for preliminary heating combustible waste material and generating, not only carries The combustibility of high combustible waste material is so that pollution-free in combustible waste material processing procedure, and combustible waste material produces after burning Raw heat energy is fully used, and increased generated energy, cement kiln clinker yield is constant simultaneously, heat consumption of clinker is constant, grog Power consumption is constant, clinker quality is unaffected, and the heat energy of whole system has obtained utilizing to greatest extent.

Claims (1)

1. can bypass cogeneration cement kiln work in coordination with process combustible waste material system, including TRT (13), kiln tail Preheater (2), kiln hood waste heat boiler (8) and kiln tail waste heat boiler (7);Kiln hood waste heat boiler and kiln tail waste heat boiler pass through steam Closed circuit connects TRT, and the air inlet of kiln hood waste heat boiler connects the waste gas outlet of chamotte cooler (3), and kiln tail preheats The discharging opening of air inlet and kiln tail preheater that the waste gas outlet of device connects kiln tail waste heat boiler connects kiln tail cigarette in rotary kiln (1) The charging aperture of room (5);
It is characterized in that: this system is also included for housing combustible waste material and the collection that combustible waste material is delivered to incinerator Device, the incinerator (18) for burning disposal combustible waste material, the raw material roller mill (19) for processing incinerator generation lime-ash And for drawing the bypass device of kiln tail smoke-box waste gas;The exhanst gas outlet of described incinerator accesses dividing of kiln tail preheater In solution stove (4);
Described collection device is configured with the heat exchanger (21) of ferment for combustible waste material catalysis and drying, chamotte cooler (3) Waste gas outlet be sequentially connected heat exchanger and bypass air-introduced machine (30) and access chimney (26) afterwards to discharge waste gas;
In described bypass device, kiln tail smoke-box is sequentially connected equipment for denitrifying flue gas (29), air preheat by taking wind pipeline Device (20), hot precipitator (9), quenching apparatus (10), bypass waste gas dust settler (6) access entering of kiln tail waste heat boiler afterwards QI KOU;
Described collection device includes house refuse and receives storehouse (23), sludge treatment equipment and/or straw reception storehouse (24);
The mud that described sludge treatment equipment includes sequentially connecting receives storehouse (22), wet mud storehouse (14), the mud of conveying mud Feed pump (15) and the desiccation machine (16) that mud is dried, discharge after also including the exhaust steam in collection desiccation machine and condensing Waste steam condensation device (17);Described desiccation machine accesses in steam circuit to obtain sludge drying institute calorific requirement;
This system also includes the purifying processing device for the gas of collection device inputs incinerator;In purifying processing device, The gas that house refuse receives in storehouse and/or sludge treatment equipment connects aerator (12) and air preheater by air supply duct (20) access burning disposal in incinerator afterwards, the exhaust gases passes of air preheater send into equipment for denitrifying flue gas and hot precipitator it Between take in wind pipeline with introduce high-temperature flue gas heat;
Described straw receives in storehouse and is provided with pulverizer (25).
CN201410284453.1A 2014-06-23 2014-06-23 System for combustible waste co-processing in cement kiln with bypass exhaust and waste heat power generation Active CN104033905B (en)

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CN108317864B (en) * 2018-03-22 2024-02-02 成都建筑材料工业设计研究院有限公司 Cement kiln deep waste heat recovery cooperated garbage incineration system
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CN109340769A (en) * 2018-09-21 2019-02-15 湖南顶立科技有限公司 The exhaust gas treating method and system of discarded circuit board pyrolysis
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CN111841322B (en) * 2020-07-29 2022-08-19 安徽萃智环保科技有限公司 Denitration and discharge method for cement kiln
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