CN104819477A - Multi-physical-state incineration technology for industrial hazardous wastes - Google Patents

Multi-physical-state incineration technology for industrial hazardous wastes Download PDF

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Publication number
CN104819477A
CN104819477A CN201510227217.0A CN201510227217A CN104819477A CN 104819477 A CN104819477 A CN 104819477A CN 201510227217 A CN201510227217 A CN 201510227217A CN 104819477 A CN104819477 A CN 104819477A
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CN
China
Prior art keywords
hazardous wastes
physical
incineration
flue gas
state
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510227217.0A
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Chinese (zh)
Inventor
肖燕
伍长青
钱兵
李军
陈竹
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Nantong Tianlan Environmental Protection & Energy Equipment Co Ltd
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Nantong Tianlan Environmental Protection & Energy Equipment Co Ltd
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Priority to CN201510227217.0A priority Critical patent/CN104819477A/en
Publication of CN104819477A publication Critical patent/CN104819477A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a multi-physical-state incineration technology for industrial hazardous wastes, and refers to the technical field of a purifying treatment of the industrial hazardous wastes. The incineration technology comprises the following steps: performing denitration treatment on industrial hazardous wastes after burning twice, and then cooling smoke gas and neutralizing with Ca (OH)2; neutralizing and absorbing smoke gas after reaction by slaked lime, and then discharging it after removing dust by a bag type dust collector; centralizing slag fluid discharged in above steps and then solidifying. According to different physical states, the hazardous wastes can be subdivided into solid hazardous wastes, liquid hazardous wastes and semisolid hazardous wastes, and so on. The multi-physical-state incineration technology selects the incineration method, and is well-adapted to incineration wastes, mature in technology, reliable in running, and relative simple in running and operation; besides, the multi-physical-state incineration technology can well satisfy requirements of various hazardous incinerations on feeding, slag discharging, complete burning and the like.

Description

A kind of industry danger waste burning treatment process of multiple physical states
Technical field
The present invention relates to the purification treatment technology field of industry danger refuse.
Background technology
More treatment process applied by domestic and international incineration of industry peril waste stove at present fixing and stoker fired grate, Liquid inject stove and pyrolysis gasification furnace etc.Stoker fired grate due to movable part many, maintenance of equipment is comparatively complicated, invests also higher, be used for process house refuse; Liquid inject stove is mainly used in the burning of waste liquid, and charging has limitation; For the incinerator of below 10t/d, pyrolysis gasification furnace application is more, but pyrolysis gasification furnace requires to be less than 300kg/m into stove material density 3, need batching pretreatment be carried out.
For the de-NOx technique of danger waste burning fume treatment, engineering adopts more selective non-catalytic reduction technique (SNCR) and SCR technique (SCR) two kinds.But SCR flue gas needed heating before entering catalysis denitrogenation device, and required catalyst market is mainly overseas brand captures, and system investments is large.
In dangerous waste incineration flue gas purifying technique, say from world wide, wet processing application at most.But wet method water consumption is comparatively large, and produce wastewater flow rate large, system complex, first investment cost is higher and operating cost is high.
Summary of the invention
The present invention seeks to propose a kind of industry danger waste burning treatment process being applicable to multiple physical states that can overcome above prior art defect.
Technical solution of the present invention is: industry is endangered refuse after twice combustion, through denitration process, then by after flue gas cool-down with Ca (OH) 2carry out neutralization reaction, reacted flue gas, again through calcium hydroxide netralizing absorption, is then discharged after fiber bag precipitator dedusting, and the slag liquid of discharging in above each step is cured process after concentrating.
According to the difference of physical aspect, hazardous waste can be subdivided into solid-state hazardous waste, liquid hazardous waste and semi-solid hazardous waste etc.The present invention selects to burn, and is the strong adaptability to incinerating waste material, and technology maturation is reliable, and operation is relatively simple, can meet the requirement that various danger is burned in charging, slagged tap, burns completely etc. very well.
Present invention process selects SNCR denitration technique, sprays into urea liquid remove NOx in waste heat boiler first lower furnace portion.This technique take burner hearth as reactor, and by realizing the transformation of boiler, the construction period is short, and cost of investment and operating cost are all lower compared with SNCR.
The smoke processing system that present invention process adopts semidry method and dry method to combine.Reach purification of acidic gas (SO 2, HCl, HF etc.) and absorption flue gas in dioxin, mercury object.While flue gas qualified discharge, save cost of investment and operating cost and reduced the complexity of operation.
Separately, in twice combustion of the present invention, ignition temperature is 850 DEG C ± 5 DEG C for the first time, and burning time first time is 45 ~ 75min, material thoroughly can be burned into high-temperature flue gas and lime-ash.
Second time ignition temperature be 1100 ~ 1200 DEG C, second time burning time >=2s.With this understanding, in flue gas, bioxin will be broken off with more than 99.99% of other harmful components.
With Ca (OH) 2carry out flue-gas temperature≤200 DEG C of neutralization reaction.Ca (OH) 2relevant with the temperature of flue gas to the removal efficiency of sour gas, in identical equivalent proportion situation, suitably reduce flue-gas temperature, HCl, SO 2clearance can reach more than 95%.According to engineering measurement research, identical in equivalent proportion, when flue-gas temperature is respectively 150 DEG C, 180 DEG C, 200 DEG C, when 150 DEG C, sour gas removal efficiency is the highest, and when 200 DEG C, sour gas removal efficiency is minimum.
Described for denitrogenation after flue gas carry out the Ca (OH) of neutralization reaction 2for Ca (OH) 2the aqueous solution, described Ca (OH) 2the aqueous solution in Ca (OH) 2mass percent 20%.Adopt the Ca (OH) of 20% 2sour gas in solution and flue gas carries out sufficient neutralization reaction, reduces acid gas in flue gas concentration, to meet GB18484 dangerous waste incineration Environmental capacity standard.
Detailed description of the invention
Industry danger refuse (can be solid-state separately, also can be liquid separately, also cocoa solid-liquid mixes) enters first and second combustion chamber through feed system entering order and burns.Wherein, ignition temperature is 850 DEG C ± 5 DEG C for the first time, and burning time first time is 45 ~ 75min, and the waste liquid that incinerating combustion value is higher in the first combustion chamber, partly or entirely replaces auxiliary fuel, saves operating cost.High-temperature flue gas enters the second combustion chamber from the kiln tail of rotary kiln, temperature be 1100 ~ 1200 DEG C, second time burning time >=2s condition under, can burn other low heat value waste liquids that the first combustion chamber should not be burned, in flue gas, bioxin will be broken off with more than 99.99% of other harmful components.Burn after formed lime-ash enter water seal scraper slagging machine from the slag-drip opening of dual firing chamber, water-cooled laggard enter ash silo, regularly deliver to solidification workshop process.
The high-temperature flue gas of discharging from the second combustion chamber outlet flue is through SNCR denitrogenation (or out of stock) technique, to eliminate in flue gas after most of NOx, through waste-heat recovery device, reclaimed by partial heat energy in flue gas, the steam of generation is used for the benefit wind of above-mentioned twice combustion, thermal deaerator and heat supply user and uses.
The flue gas being recovered most of heat energy carries out chilling cooling through quench tower, makes its temperature lower than 200 DEG C, then in half-dried reaction tower with by atomizer spray into 20% Ca (OH) 2slurries mix fully, the sour gas such as SOx, HCl in flue gas and Ca (OH) 2be removed after carrying out neutralization reaction.
Flue gas enters dry type extracting tower again, in dry type extracting tower, heavy metal in the sour gas in flue gas and calcium hydroxide generation neutralization, flue gas etc. and active carbon generation suction-operated, all removal to a certain extent.
Enter fiber bag precipitator from dry type extracting tower exiting flue gas, in fiber bag precipitator, the suspended particulate substance (as dust, the heavy metal be tightly held by activated carbon and dioxin-like chemical etc.) in flue gas is tackled by filter bag, discharges with the form of flying dust; Flue gas after sack cleaner drains into air under the effect of air-introduced machine, by chimney is up to standard.
The slag liquid of discharging in each step is above cured process after concentrating.

Claims (4)

1. an industry danger waste burning treatment process for multiple physical states, is characterized in that: industry is endangered refuse after twice combustion, through denitration process, then by after flue gas cool-down with Ca (OH) 2carry out neutralization reaction, reacted flue gas, again through calcium hydroxide netralizing absorption, is then discharged after fiber bag precipitator dedusting, and the slag liquid of discharging in above each step is cured process after concentrating.
2. treatment process according to claim 1, is characterized in that: in described twice combustion, first time ignition temperature be 850 DEG C ± 5 DEG C, burning time first time is 45 ~ 75min; Second time ignition temperature be 1100 ~ 1200 DEG C, second time burning time >=2s.
3. treatment process according to claim 1, is characterized in that: with Ca (OH) 2carry out flue-gas temperature≤200 DEG C of neutralization reaction.
4. treatment process according to claim 1 or 2 or 3, is characterized in that: described for denitrogenation after flue gas carry out the Ca (OH) of neutralization reaction 2for Ca (OH) 2the aqueous solution, described Ca (OH) 2the aqueous solution in Ca (OH) 2mass percent 20%.
CN201510227217.0A 2015-05-07 2015-05-07 Multi-physical-state incineration technology for industrial hazardous wastes Pending CN104819477A (en)

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Application Number Priority Date Filing Date Title
CN201510227217.0A CN104819477A (en) 2015-05-07 2015-05-07 Multi-physical-state incineration technology for industrial hazardous wastes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106594751A (en) * 2017-01-11 2017-04-26 北京生态岛科技有限责任公司 Waste incineration system
CN106678811A (en) * 2017-01-11 2017-05-17 北京生态岛科技有限责任公司 Method of disposing waste

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10337432A (en) * 1997-06-09 1998-12-22 Chiyoda Eng Kk Exhaust gas treatment and device therefor
CN101004267A (en) * 2006-11-15 2007-07-25 龚德明 Incineration equipment system of rotary kiln for hazardous waste garbage
CN101469866A (en) * 2007-12-24 2009-07-01 同方环境股份有限公司 Industrial dangerous waste incineration processing system for realizing multiple physical states
CN203744265U (en) * 2014-01-24 2014-07-30 川崎重工业株式会社 Denitration system of incinerator
CN203750409U (en) * 2014-01-28 2014-08-06 上海黎明资源再利用有限公司 Flue gas purifying treatment device in waste incineration process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10337432A (en) * 1997-06-09 1998-12-22 Chiyoda Eng Kk Exhaust gas treatment and device therefor
CN101004267A (en) * 2006-11-15 2007-07-25 龚德明 Incineration equipment system of rotary kiln for hazardous waste garbage
CN101469866A (en) * 2007-12-24 2009-07-01 同方环境股份有限公司 Industrial dangerous waste incineration processing system for realizing multiple physical states
CN203744265U (en) * 2014-01-24 2014-07-30 川崎重工业株式会社 Denitration system of incinerator
CN203750409U (en) * 2014-01-28 2014-08-06 上海黎明资源再利用有限公司 Flue gas purifying treatment device in waste incineration process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106594751A (en) * 2017-01-11 2017-04-26 北京生态岛科技有限责任公司 Waste incineration system
CN106678811A (en) * 2017-01-11 2017-05-17 北京生态岛科技有限责任公司 Method of disposing waste

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Application publication date: 20150805