CN101618954B - Process for processing municipal domestic waste by cement rotary kiln - Google Patents

Process for processing municipal domestic waste by cement rotary kiln Download PDF

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Publication number
CN101618954B
CN101618954B CN200910065584XA CN200910065584A CN101618954B CN 101618954 B CN101618954 B CN 101618954B CN 200910065584X A CN200910065584X A CN 200910065584XA CN 200910065584 A CN200910065584 A CN 200910065584A CN 101618954 B CN101618954 B CN 101618954B
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China
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cement
domestic waste
waste
burning
rubbish
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CN200910065584XA
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Chinese (zh)
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CN101618954A (en
Inventor
任沁新
王继生
戚天明
袁曙光
许卫革
金树宝
余佳
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中信重工机械股份有限公司
洛阳矿山机械工程设计研究院有限责任公司
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Priority to CN200910065584XA priority Critical patent/CN101618954B/en
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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
    • 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 relates to a process system for processing municipal domestic waste by a cement rotary kiln. The domestic waste is processed by the following steps: manually separating, pre-dewatering and shattering the domestic waste; drying and burning the shattered domestic waste by an auxiliary burning furnace; enabling generated waste gas and released heat to enter a preheat decomposing systemof the cement rotary kiln; and finishing the drying, preheating and partial burning functions of cement raw material, wherein burning ash enters the cement rotary kiln by a cement-decomposing kiln asa raw material to produce cement clinker. The invention fully utilizes facilities and places of the prior cement plants to save investments, processes harmful gas, does not need fuel consumption and has low processing cost and great handling capacity because of a high heat value of organic matter in the waste, solves the problem of secondary pollution, saves natural resources and non-renewable energy and reduces the influence of the waste on a burning system to the minimum.

Description

A kind of cement rotary kiln is handled the method for domestic waste

Technical field

The present invention relates to a kind of treatment of urban garbage technology, particularly relate to the process system that a kind of cement rotary kiln is handled domestic waste.

Background technology

How handling increasing domestic waste has become a great research topic of the world today.The traditional way that China handles domestic waste is a landfill method, and this method relatively is fit to a spot of domestic refuse in small city.The disadvantage of landfill is to take the land resources of a large amount of preciousnesses, and the refuse treatment cycle is long, causes percolate and volatilization gas polluted underground water, air and soil etc. easily.More novel processing mode is the burning electricity generation method, has that land occupation is few, the processing cycle is short, can realize significantly subtracting advantages such as appearance, recoverable energy.But waste incineration and generating electricity method treating refuse cost is high, is easy to generate toxic gas, and the disposal of the rubbish that produces after burning ash also is a very problem of trouble.External commonplace is in Cement industry, to dispose domestic waste at present, and the inorganic components in the rubbish is as the raw material of producing cement, and organic composition can be used as secondary fuel.So both protect environment, practiced thrift resource again, had lot of advantages.Utilize domestic waste to produce cement, also should become our following main developing direction.

But the rubbish of China and external rubbish have very big difference on composition and collection mode, it is infeasible to indiscriminately imitate external method fully.The domestic city domestic refuse can not provide continual and steady energy for combustion processes because moisture is high, calorific value is low, need to consume a large amount of auxiliary fuels, and these moisture causes system jams easily with incineration flue gas entering cement kiln preheating decomposition system; Domestic refuse complicated component, fluctuating range are big, cause the instability of firing system, and the part objectionable impurities is mingled in the incineration residue after burning, and also bring difficulty for the processing of incineration residue, and can produce harmful poisonous gas in burning; The size of rubbish differs, and gives the burning deleterious impact, occurs easily burning and does not pass through phenomenon, and also can contain the very big particle of size in the incineration residue, can influence the production of cement clinker after the entering cement kiln system.Therefore, press for and work out the waste disposal method that is fit to a kind of China's actual conditions, reach the purpose of effective treating refuse.

Summary of the invention

Technical problem to be solved by this invention provides the process system that a kind of cement rotary kiln is handled domestic waste; Solve the technical problem that faces in the garbage treatment process; Particularly adopt some pretreatment technology and auxiliary mode of burning, reduce rubbish and drop into behind the cement kiln influence to cement clinker output and quality.

In order to reach the purpose that solves the problems of the technologies described above, the present invention has adopted following technical scheme:

A kind of cement kiln of the present invention is handled the domestic waste process system, comprising:

---the manual sorting, carry out the manual sorting with domestic waste and separate to be not suitable for burning and be not suitable for the article of cement with residue; Can be at transfer point through the manual sorting; Sort out the material such as waste household appliances, furniture, concrete, iron and other metals and chloride PVC plastics, cable waste of big part wherein; Rubbish after the letter sorting is transported to the cement mill with cram packer, also can sorts in the cement mill;

---dehydration in advance, domestic waste is dewatered, reach the reduction refuse moisture, increase the purpose of refuse thermal value; Dewatering can compress dehydration to domestic waste with the compression water extracter, also can use other effective ways, and technologies such as for example centrifuge dehydration, broken back leakage dehydration are dewatered;

---break process, the domestic waste after the dehydration is carried out break process, reduce the rubbish particle diameter, increase specific surface area, be convenient to burnout; Rubbish after breaking method can be to use reciprocating type shear breaker to dehydration carries out shearing-crushing, also can use other broken or breaking method;

---auxiliary incinerator burns; To drying and burn through the domestic waste of dehydration, break process; Cinder from refuse incineration gets into the cement kiln system as raw material for producing cement chamotte through decomposing furnace; Waste gas that waste incineration produces and the heat that discharges can get into the pre-heating system of cement kiln tail, accomplish oven dry, preheating and the part of cement slurry and burn.

What add incinerator in the cement producing line is feasible.At first, the equipment in the general cement firing system all has 15~20% scale-up factor in design, so that improve production line output.With the 5000t/d production line is example; The tertiary air total blast volume is the rich amount of hot blast that 450,000 m3/h (850 ℃) wherein have 70,000 m3/h; Want preheating, oven dry to handle the domestic waste of 10t/h, probably need 5.7 ten thousand steres air quantity hourly, so original system can satisfy this system requirements; Secondly, in the cement precalcining system, the negative pressure in the tertiary-air pipe is-900Pa, and in three grades, level Four waste pipe its pressure at-3500Pa, maximum can reach-5000~-6000Pa, can guarantee the mobile unobstructed of flue gas.

Domestic waste amount and the needed exhaust gas volumn handled as required, the relevant parameter of design various device.For example, can design selection the physical dimension of auxiliary incinerator be Φ 4 * 16m, inlet/outlet pipe is Φ 2m, the cindery caliber of turnover material is Φ 800m.

The invention has the beneficial effects as follows: the present invention will pass through pretreated rubbish and be sent to the auxiliary incinerator of newly-designed rubbish and burn, and then drop into cement kiln and produce cement clinker, thereby make domestic refuse obtain good treatment; Make full use of existing cement mill facility and place, reduced investment; The waste gas that waste incineration produces gets into the cement pre-heating system, and obnoxious flavour obtains handling, and does not need newly-built emission-control equipment; Organism contains higher calorific value in the rubbish, and burning need not increase fuel consumption, and processing cost is low, and treatment capacity is big; Incinerator ash gets into cement kiln at last as raw material production cement, has solved the secondary pollution problem; Natural resources and Nonrenewable energy resources have been saved; Rubbish is through after pre-treatment and auxiliary the burning, the influence of firing system dropped to minimum, reduces the influence to cement clinker output and quality; Farthest realized " innoxious, minimizing, the resource utilization " of domestic waste.

Description of drawings

Fig. 1 is the domestic waste pretreatment technology schema of the embodiment of the invention.

Wherein: 1. cram packer, 2. rubbish stockyard, 3. grab bucket, 4. rubbish compression water extracter, 5. rotary conveyor, 6. threeway discharge valve, 7. reciprocating type shear breaker, 8. high angle belt conveyer machine, 9. leachate collection pond, 10. sump pump, 20. pretreated rubbish.

Fig. 2 is the auxiliary incineration process flow figure of the domestic waste of the embodiment of the invention.

Wherein: 11. high angle belt conveyer machines, 12. surge bunkers, 13. double-deck turnover panel lock feeding valves, 14. rubbish are assisted incinerator, 15. lock feeding valves, 16. bucket elevators, 17. decomposing furnace exhaust pipelines, 18. decomposing furnaces, 19. tertiary airs, 20. pretreated rubbish.

Fig. 3 is the auxiliary structural plan of incineration system in cement producing line of kiln tail that the present invention designs.

Wherein: 21. cloth comb plates, 22. air bubbles, 23. blanking pipelines, 24. blast pipes, 25. control gate valves, 31. one-level whirlwind tubes, 32. secondary whirlwind tubes, 33. 3 grades of whirlwind tubes, 34. Category Four cyclone tubes, 35. five-stage whirlwind tubes.

Fig. 4 is the sectional view of the auxiliary incineration system of the kiln tail that designs of the present invention.

Wherein: 26. preheating decomposition systems, 27. auxiliary incineration systems, 28. blanking pipelines, 29. exhaust pipelines, 30. burn exhaust pipeline, 33. 3 grades of whirlwind tubes, 34. Category Four cyclone tubes, 35. five-stage whirlwind tubes.

Embodiment

Specify embodiment of the present invention below in conjunction with accompanying drawing, but the content that is not limited to enumerate in the embodiment.

A kind of cement rotary kiln of the present invention is handled the process system of domestic waste; The domestic refuse that manual sorting's process at first will disperse to collect is transported to transfer point; Rubbish is transfer point process manual sorting; Sort out waste household appliances, furniture, concrete, iron and other metals and the materials such as chloride PVC plastics, cable waste of big part wherein, the rubbish after the letter sorting is transported to the cement mill with cram packer.

Rubbish after the letter sorting at first will dewater in the cement mill and pre-treatment such as fragmentation.As shown in Figure 1, after cram packer enters factory, carry out weighing through the cement mill weighbridge earlier, the rubbish discharging platform is sailed in weighing cram packer 1 later into, and rubbish is discharged into rubbish stockyard 2.Control grab bucket 3 by the grab bucket watch-keeping cubicle rubbish put into trash compactor 4, rubbish compresses dehydration in compressor.Domestic refuse is after overdraft dehydration, and water ratio generally can be reduced to about 20% from 50%, and thermal value improves greatly.Rubbish after the dehydration is carried through rotary conveyor 5, gets into reciprocating type shear breaker 7 through threeway discharge valve 6, carries out shearing-crushing work, reduces the particle diameter of rubbish.The shearing force of shear crusher utilization machinery thick rubbish splitting with cut off, increase rubbish specific surface area reduces particle diameter, the stability and the efficient of operations such as raising burning, thermolysis.The percolate in moisture that rubbish compresses out and rubbish stockyard enters leachate collection pond 9 together, after the capacity of collecting tank acquires a certain degree, through sump pump 10 percolate is squeezed into special sewage transport trolley and delivers to sewage work and handle.

After the pre-treatment such as dehydration of rubbish process and fragmentation, getting into auxiliary incineration system 27 carries out burning disposal, and rubbish assists the technical process of burning as shown in Figure 2.Delivered in high about 50 meters surge bunker 12 by high angle belt conveyer machine 11 through pretreated domestic waste 20, rubbish 20 evenly gets in the auxiliary incinerator 14 of domestic waste through double-deck turnover panel lock feeding valve 13 again.Domestic refuse 20 assists incinerator 14 to carry out sufficient heat exchange with the tertiary air 19 of tertiary-air pipe at rubbish, and rubbish is at first by hot-air seasoning, and the organic compound combustion in the rubbish decomposes, and discharges heat.Through after fully burning, wherein noncombustibles matter forms incineration residue to domestic refuse in incinerator, discharges incinerator through lock wind discharge valve 15.Get in the auxiliary incinerator 14 through 25 fens two-way of control gate valve from the tertiary air in the tertiary-air pipe 19; Carrying out heat exchange with material; Accomplishing oven dry, preheating and the part of domestic refuse burns; Send in the decomposing furnace exhaust pipeline 17 of kiln tail pre-heating system through gas exhaust duct, accomplish oven dry, preheating and the part of cement slurry again and burn function.On the in/out air tube road, also be provided with control gate valve 25, can split assisting incineration system to separate separately in case of necessity, and do not influence the normal operation of whole cement preheating decomposition system.Fig. 3 has shown the structural arrangement of auxiliary incineration system at cement producing line.Fig. 4 has shown the section layout n. of auxiliary incineration system 27 in the preheating decomposition system 26 of cement kiln.

Handle the back domestic waste through auxiliary incineration system and become incineration residue; Incineration residue is that bucket elevator 16 is sent in the decomposing furnace 18 in the cement precalcining system through handling equipment among Fig. 2; Burn once more and decompose, get into cement kiln with raw material at last.Because the composition of waste incineration ash composition and clay is very close, therefore participate in firing of cement clinker as the part of cement raw material.In the total system of the present invention's design, domestic waste has finally been realized the processing target of " innoxious, minimizing, resource utilization " basically.

For making material in stove, carry out heat exchange fully, be designed with which floor cloth comb plate 21 in the stove with hot blast.According to coming material granularity and moisture situation, the comb hole dimension of cloth comb plate 21 varies in size.Cloth comb plate 21 is designed to the positive cone and the back taper of different angles, to enlarge heat exchange area and to prolong the residence time of material in stove.For the hot blast that makes equipment can adapt to 800 ℃~900 ℃ passes through, comb sheet material matter will be used high temperature steel, and the stove barrel also will have been built certain thickness refractory materials by laying bricks or stones and protected.In addition, for prevent material through the time with the comb hole plug, be provided with several air bubbles 22 at the different sites of body of heater, regularly or not timing suitably clear up.

A lock feeding valve 15 is set in the blanking pipeline 23, is guaranteeing under the condition of tight lock wind the material smoothness to be fed in the stove equably, it is also like this to discharge cindery process.For guaranteeing that this system can the relatively independent works better that does not influence the firing system of cement, all establish control gate valve 25 in the blast pipe 24, controllable adjustable air intake and break off air intake at any time.

Fig. 4 has shown the section layout n. of auxiliary incineration system 27 in the preheating decomposition system 26 of cement kiln.The waste gas that incinerator is discharged has two scheme arrangement: one of which, waste gas are delivered in the highly close decomposing furnace exhaust pipeline 17, and objectionable impurities can continue pyrolytic decomposition in decomposing furnace 18 in the waste gas, and the flying dust in the waste gas can further reclaim through whirlwind tube 31~35.Weak point is that the moisture of institute's carburation by evaporation also enters into preheating decomposition system 26 in the waste gas, may exert an influence to the heat exchange of raw material or because of the increase of moisture makes green powder attached on the tube wall, causes system's blanking pipeline 28 to stop up; Its two, lengthening burns exhaust pipeline 30, waste gas is directly guided in the exhaust pipeline 29 of one-level whirlwind tube 31 outlets, is discharged in the preheating decomposition system 27 by high-temperature blower, eliminates the disadvantageous effect of refuse moisture to precalcining system; Weak point is that flying dust in the waste gas and objectionable constituent reclaim and accomplished by the flare system of original production line, can cause the increase of ash amount, exhaust gas constituents complicacy.Can adopt the scheme that relatively is fit to as the case may be.

Claims (2)

1. a cement rotary kiln is handled the method for domestic waste, it is characterized in that: cement kiln is handled the domestic waste method and is comprised processes:
---the manual sorting: domestic waste is carried out the manual sorting, and isolating is not suitable for burning is not suitable for producing the article of cement clinker with residue;
---dehydration in advance: domestic waste is dewatered, reach the reduction refuse moisture, increase the purpose of refuse thermal value, dewatering is for to compress dehydration with the compression water extracter to domestic waste;
---break process: the domestic waste to after the dehydration carries out break process, reduces the rubbish particle diameter, increases specific surface area;
---auxiliary incinerator (14) burns: to drying and burn through the domestic waste (20) of dehydration, break process; Cinder from refuse incineration gets into the cement kiln system as raw material for producing cement chamotte through decomposing furnace (18); The preheating decomposition system (26) of waste gas that waste incineration produces and the heat that discharges entering cement kiln tail is accomplished oven dry, preheating and the part of cement slurry and is burned.
2. handle the method for domestic waste according to the said a kind of cement rotary kiln of claim 1, it is characterized in that: the rubbish after described break process method is to use reciprocating type shear breaker (7) to dehydration carries out shearing-crushing.
CN200910065584XA 2009-07-20 2009-07-20 Process for processing municipal domestic waste by cement rotary kiln CN101618954B (en)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101761928B (en) * 2010-01-11 2014-01-15 中信重工机械股份有限公司 Incineration treatment method for domestic refuse
CN101793402A (en) * 2010-03-25 2010-08-04 天津水泥工业设计研究院有限公司 Method for processing domestic garbage riddlings and/or solid combustible wastes in cement kiln
CN102070308B (en) * 2010-12-01 2012-11-28 中信重工机械股份有限公司 Device technology configuration method for treating house refuses by using rotary cement kiln
CN103113030A (en) * 2013-03-05 2013-05-22 郭文龙 Method for treating household garbage by absorbing heat energy through raw meal nodules
CN103341300A (en) * 2013-07-23 2013-10-09 郭涵 Method for purifying waste incineration smoke by using novel dry process raw material vertical mill
CN104496134A (en) * 2014-12-19 2015-04-08 北京金隅股份有限公司 Method for treating sludge by using cement kiln, and cement kiln system for treating sludge
CN105669057A (en) * 2016-01-15 2016-06-15 浙江环立环保科技有限公司 Waste bag and active carbon treatment method
CN106871126A (en) * 2017-01-04 2017-06-20 长沙汇聚环境技术有限公司 A kind of processing method of house refuse low-temperature carbonization innoxious burning
CN106966618A (en) * 2017-02-27 2017-07-21 西南科技大学 A kind of method of cement kiln synergic processing house refuse

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN1313256A (en) * 2000-03-15 2001-09-19 上海水泥厂 Ecological cement prepared from industrial and city wastes
CN1864876A (en) * 2006-06-22 2006-11-22 浙江大学 A comprehensive treatment process for urban domestic garbage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313256A (en) * 2000-03-15 2001-09-19 上海水泥厂 Ecological cement prepared from industrial and city wastes
CN1864876A (en) * 2006-06-22 2006-11-22 浙江大学 A comprehensive treatment process for urban domestic garbage

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