[daily share] technology of off-gas treatment of industry of 6 kinds of spray is comparative

The organic industry waste gas that discharges in spray process is right surroundings even human health brings a harm, waste gas of spray paint industry is main with 3 benzene (benzene, toluene, xylene) give priority to, some still hold an ester concurrently kind, ether kind, the constituent such as ketone. These volatile organic matter make gently poll abhor heart, heavy convulsive and insensible, hurt system of human body immunity. To solve these problems effectively, country and partial province city already promulgated the harm of a series of law laws and regulations and limitation of standard of atmosphere environmental protection and generation of processing industry waste gas.

　　The composition of spray industry waste gas reachs a harm

Besmear in spray paint the paint majority of air jet of the high pressure in installing a process stays on workpiece, other the sparge particle that did not arrive at spray surface and the drip in suspension with deliquescent atomic spray paint are in air, and the volatile organic compound of the generation in spray process forms waste gas of spray paint industry to pollute an environment. Because place of different paint coating uses solvent to differ, the constituent of industrial waste gas that arises in spray process consequently is different also. It is with car spray exemple detect give 15 kinds of VOCs, including benzene is content (toluene, xylene) , ester kind (ester of second acerbity second, second acid fourth ester) , ketone (ketone of methylic different butyl) with ether kind (glycol fourth aether) wait. And other places of Beijing, Shanghai, Guangdong, Jiangsu installs industry VOCs to discharge in the light of besmear established corresponding standard, Its VOCs composition reachs different paint and the coating that use different technology production scale is very different also. Because off-gas treatment of industry of this spray paint wants the VOCs according to generation,sort differs the choice purifies a technology aptly.

Waste gas of spray paint industry nots allow to ignore to human harm, send out the Qi Wu in air can bring become impatient after classics respiratory tract is inspiratory chronic and toxic, damage the nerve of human body and hemopoietic system. The memory that the industry such as ester of acerbity second of the benzene that inspiratory Gao Nong spends, toluene, second abandons the meeting inside be discouraged time to restrain a person, attention and sensory motion speed, contact for long can cause noxiousness reaction to liver, cause to central nervous even destroy. Watch 2 for countrywide profession sanitation Committee on Standard puts forward ” harmful element profession contacts yard place be restricted to be worth ” (GBZ2, 2002) , stipulated the organic compound such as 3 benzene is concessional osculatory chroma.

The immune function that paint pollutes pair of workers and hematopoiesis function have certain effect. In real operation process, what the worker contacts is the mixture of a variety of chemical and harmful material, the independence of these contaminant, in coordination, Jie is fought, adding mixed associated noxiousness effect is adv unimaginably. Accordingly, contain a variety of part the waste gas of spray paint industry of volatile organic compound purifies processing to appear particularly important.

　　Technology of pretreatment of spray industry waste gas — wet purify a law

Spray industry waste gas contains volatile organic substance not only, the in suspension in still including spray course is in the Qi Wu in air, qi Wu can affect off-gas treatment of follow-up and organic industry, purify of the need before so waste gas of spray paint industry is purified among them Qi Wu, so that be opposite next among them volatile organic matter purifies processing.

Wet purifying a law is principle of dissolve of basis likeness photograph, absorb through solvent (chemical perhaps absorb) the Qi Wu in waste gas of spray paint industry, commonly used wet purify a law to the processing such as type of the type of water shade type, act of the water that do not have pump, type in Wen Qiu, water coming back purifies a law.

1, water shade type purifies a law

Water shade type purifies a law is the layer of shade shape water that through water pump circular gush drenchs generation flows, water act catchs collect to fly the Qi Wu that come loose, technological process is shown 1 times like the graph. Spray booth of type of shade of general and large water places water shade brae in room bottom, adjust through special loop water pump water shade appearance, when spray paint air current carries water sign, qi Wu is adhered to to stay. The device of common spray booth of water shade type on industry is main by body of spray booth room, Qi Wu filter of segregator of purifier, hydrosphere, water, boiler circulation is in charge of, the partial composition such as system of lighting installation, fan, water pump and electric equipment control. Water shade type purifies a law to be able to reduce the discharge capacity of the Qi Wu in waste gas of spray paint industry effectively, the operation is convenient, the structure is simple. But the waste water that water act purifies generation to contain Qi Wu, need to abandon water treatment to prevent 2 times to pollute; to spray booth of large water shade, shade of bedding face seeper can increase indoor air humidity, affect worker work environment and coating quality.

2, type of act of the water that do not have pump purifies a law

Having type of pump water act to purify a law is to use air revulsive carry water to form water screen, after waste gas of spray paint industry and water act clash, the drip; that water act holds back mist shape particle to reach its to carry paint next industrial waste gas crosses water shade to enter air-water agitate passageway, after with water in the passageway mixture; enters collect to enrage box because enrage fast reduce hair life fluid to depart, the gas after purifying discharges atmosphere in, the water that is departed enrages the assemble in box to flow to excessive cistern in collect, repass flashing board form water screen, repeat circularly purify waste gas of spray paint industry, technological process is shown 2 times like the graph. Purify a law at water shade type relatively, the type that do not have pump purifies a law to go besides water pump equipment, optimized purify flow, managing cost and cover an area of an area, overcame wall of conduit of lacquer mist adhere to cause the appearance of water pump block at the same time.

3, type of act of the water in Wen Qiu purifies a law

Spray paint of type of act of the water in complete Wen Qiu is purified room seal the system, composition such as power supply system by the room body, system sending wind, system that discharge wind, air feed system, water supply, watertight. Handling flow basically is the gas phase negative pressure that exerts the effect in Wen Qiu, air current is quickened quickly in position of opening of the larynx in Wen Qiu, the even current that carries blast tuyere by sufficient pulverization, ; of the Qi Wu in using the lunt of pulverization to catch market industry waste gas contains the water broken bits of paint to purify the effect in order to achieve from the depart in air current in centrifugal segregator lieutenant general finally, technological process sees a picture 3. Type of act of the water in Wen Qiu purifies what can raise Qi Wu effectively to catch market efficiency, can reduce equipment specific power consumption at the same time, but it is not good that the effect is handled in the Qi Wu in spray booth to suspension, easy adhere is in Qi Wu on the wainscot of spray booth.

4, water type coming back purifies a law

Water type coming back processing system is average form by system of room body, lighting, system sending wind, convulsions system, water supply, cistern and fire prevention system. Fundamental is after cleaning waste gas of spray paint industry beforehand through water act, come back to water implement, use come back pressure implement the wallop of the high speed air current inside furls water, achieve goal of mist of the lacquer that catch market thereby, technological process is shown 4 times like the graph.

Problem of existence of this purifying device is water of each photograph adjacent comes back implement disturb each other between air current, air current utilization rate is low, make water comes back implement pulverization effect administrative levels is not neat Qi Ni of bottom of; gush room keeps clear of not easily, it is difficult that maintenance clears.

Spray industry waste gas contains volatile organic substance not only, the in suspension in still including spray course is in the Qi Wu in air, qi Wu can affect off-gas treatment of follow-up and organic industry, purify of the need before so waste gas of spray paint industry is purified among them Qi Wu, so that be opposite next among them volatile organic matter purifies processing.

　　Technology of pretreatment of spray industry waste gas — dry type purifies a law

Doing type to purify a law is spray paint industry waste gas enters filter, use filter layer block to take the Qi Wu in waste gas of spray paint industry and grain matter, cotton of commonly used fibre glass, slag expect as filter. Theoretic filter the law is OK purify is major Qi Wu, undertake a few adsorption to among them volatile organic matter. This method does not have pollution 2 times, producing defect of liquid waste; is to filter not quite complete, serious to equipment pollution, easy jam. From the watch 5 can see, opposite at wet purify a law, dry type purifies a law to be stabilized not quite on function, but wait as a result of the United States already will wet purify those who discharge contain coating waste water to count dangerous litter, the enterprise begins to abandon wet purify a law, turn and use the dry type that does not have liquid waste eduction to purify a law.

Of organic industry waste gas purify processing

The spray industry waste gas after via purify Qi Wu is handled basically contains volatile organic substance, its handle a technology to include a tradition to purify technology, new-style purify technology and compound model purify a technology. The tradition purifies a technology to include adsorptive method, absorb law, combustion law and condensation law to wait application is at present wider, at the same time new-style purify technical membrane separation law, smooth catalysis law, biology law and plasma purify a law to wait to also get in recent years a few investigator purify these the technology develop quickly and applied; in recent years respective advantage union rises, innovation goes compound model purify processing technology, ceaseless practice and the processing effect that explore best combination and purify a technology.

1, the tradition purifies processing technology

2, new-style purify processing technology

3, spray industry waste gas purifies craft to choose

Choose proper technology to administer waste gas of spray paint industry to pollute very be necessary, dry type purifies Qi Wu to filter efficiency is inferior, applied range is narrower; is wet purify early days installation cost taller, but function stability, purify efficiency tall, moving cost is inferior, domestic major company chooses this method.

Large and medium-sized the waste gas of industry of enterprise spray paint such as car, shipping, furniture is administered but according to respective characteristic, choose different compound type to purify a technology. Can use to off-gas treatment of industry of car spray paint ” runner is adsorptive + catalytic combustion ” craft or ” activated carbon is adsorptive + desorption + catalytic combustion law ” craft, it is mature to tend on this engineering technology, can rise on the oldest rate purify efficiency; to measure the company with high concentration of waste gas of bigger, industry to be able to be used to the spray paint such as shipping ” adsorptive – desorption – solvent reclaims ” compound purify a technology, in assure 90% above purifying rate while, the dissolvent that reclaims desorption is used 2 times, raise economic benefits.

What as science and technology ceaseless progress and experiment study is ceaseless and thorough, waste gas of spray paint industry treats reason onefold the way that purifies craft to be united in wedlock to a variety of craft develops, producing different technology advantage while, also avoid is onefold the inadequacy of craft, the oldest rate improves the processing efficiency that spray paint enrages. But compound model processing technology needs to solve investment to run cost difficulty of inadequacy of tall, stability, operation is advanced problem, should apply extensively at besmearing the processing of tail gas of industry spray paint such as outfit, chemical industry, car, shipping still needs to be perfected further to rise. How to purify waste gas of spray paint industry to achieve a country to discharge a standard with the smallest economy cost and manpower investment, decrease to bring economic benefits to still need relevant domain to researcher and enterprise are explored ceaselessly and be carried out at the same time to environmental pollution.