[dried food] spray paint room big pool of off-gas treatment method!

Paint basically produces Qi Wu, organic waste gas to pollute in spray process. Paint changes particle in high-pressured action mist, when spray, partial paint did not arrive at appearance of spray paint substance, form Qi Wu along with air current dispersion. The bases in Qi Wu is 3 benzene (benzene, toluene, xylene) it is to use attenuant paint in order to achieve the goal with thing smooth and beautiful face, but organic dissolvent volatilizes extremely easily, cannot adhere to for long along with paint at thing surface, will release entirely in spray and air process, form organic waste gas thereby, its characteristic is colorless, provide extremely excitant, flow along with airy and diffuse at atmosphere in, can breathe through human body or make system of choose and employ persons directly, lung, hepatic to the respiratory system of human body, blood, heart, mucous membrane, eye, nerve cause harm, also can harm people directly through the skin. Accordingly, need undertakes be collected effectively and be doinged depurative processing, in order to ensure company production moves good reach improvement workshop and plant area environment, achieve requirement of national environmental protection.

1, spray paint room off-gas treatment technological process

Fan of classics of organic waste gas is smoked inside the workshop Pp washer is entered after bringing, waste gas undertakes via Pp washer gush drip washing washs first, its main effect is eliminate dust and big lacquer content grain, the physics with have certain at the same time dissolves and cover action. Gush drenchs the circular water in the tower and circular cistern are interlinked, can keep clear of regularly Chi Zhongfu arrives the lacquer content of surface. Will big grain and dissolve the material at water first gush is washed come down, depart water mist via dehydrator again, the dehydration function eliminate that uses dehydrator namely carries the moisture of the move on waste gas. Reentrance of the waste gas after drip washing of gush of waste gas classics washs the tower is handled off-gas treatment equipment of Uv smooth oxygen, structure of interior of off-gas treatment equipment is Uv smooth oxygen UV light solves tube. Off-gas treatment equipment uses Uv smooth oxygen beam of light of ultraviolet ray of 185nmUV of high-energy tall ozone decomposes the oxygen element in air to produce free oxygen, namely active oxygen, because oxygen place carries free to losing an electron lopsided need to be united in wedlock with oxygen element so, generate ozone then; ＊ of O-+O of → of UV ＋ O2 (active oxygen) O+O2 → O3 (ozone) , ozone and show group of atom of free condition pollutant, generate new, harmless or low kill material, wait like CO2, H2O, in the meantime, ozone has extremely strong oxidation to organic matter, excitant to effluvial gas and other peculiar smell has the cleared effect of get effect instantly. This plan handles efficiency not only tall, the contaminant such as content of dust of can effective purify, lacquer and benzene, toluene, xylene, fourth ketone, aldehyde, additive, mark can be amounted to to discharge after managing everywhere, block of wind of off-gas treatment equipment is small, move uphold charge low, it is very advanced advantageous off-gas treatment program.

　　 2, the benzene in spray waste gas

Benzene, be one kind does not have color below average temperature, contain little sweet transparent shape liquid, and have more acuteness balmy taste. Benzene is a kind can flaming, and poisonous, it is a kind of material that can cause cancer. Benzene also is a kind of hydrocarbon, it is aromatic hydrocarbon inside simpler one sort, its dissolve compares difficulty at water, but dissolve easily inside a few organic and deliquescent agents, itself also is can be regarded as organic dissolvent.

3, the toluene in spray waste gas

Toluene is one kind does not have color, very clear liquid, contain a bit flavor with benzene, have stronger refraction character, can mix carbon of alcohol, ether, acetone, chloroform, 2 vulcanization and glacial second acid mix each other deliquescent, dissolve the character at water is very tiny. Toluene is liquid of a kind of easy flaming, vapour can produce the compound that has explosive character with air, contain excitant.

The composition in spray waste gas is to have certain and complex character, certain noxiousness, and contain easy blaze explode easily, when administering, need applies high-pressured fan to take spray waste gas or steam come back stream handle inside the tower.

Spray waste gas basically is spray paint and air / the gas that adust process releases, discharge what damage human body through breath to the meeting in atmosphere is neurological, manage like where in the light of this kind of waste gas? Look below together!

Destroy plan to basically include catalytic combustion unit (type of RCO) , accumulation of heat burner (RTO) and microtherm plasma.

4, water sparge law

Application of water sparge law is wide, its principle is to pass water to spray in exhaust emission, water-solubility or big grain sedimentation, achieve the goal with contaminant, clean detached gas. Take spray booth of act of the water that do not have pump to be exemple, spray booth of shade of this water that do not have pump uses air revulsive carry water to form circular water screen. When the worker faces water shade to undertake to workpiece surface spray paint is operated, the air that contains Qi Wu is in after be being bumped with water act, cross water shade to enter air-water passageway, with the water in the passageway generation mixes strongly, after entering collect to enrage box, velocity of flow is reduced suddenly, air-water is detached, after air passes manger, be smoked by fan in device of activated carbon adsorption; And excessive cistern is flowed into after collect be been in by detached water enrages box assemble, water arrives from excessive cistern overflow on flashing board form water screen, shed backwater box, make in this process Qi Wu forms clinker, thereby content of grain of adsorptive purify paint.

5, adsorptive law

Activated carbon adsorption, it is a kind of common off-gas treatment method. Adsorptive Farley uses bath of porous activated carbon, silicon earth, anthracitic etc, adsorption of element of will organic gas arrives its surface, purify thereby.

Good qualities: Purifying rate is high (activated carbon adsorption can amount to 99% above) , practical pervade, operate simple, investment is low.

Defect: Systematic leeway is lost big, make specific power consumption taller, the saturation of sorbent nods difficult control, sorbent capacity is finite, moving dosage is taller.

6, break off a law

Break off a law, it is to pass special type to filter material, buy is put at course is being discharged outside waste gas, via machine discontinuity, attain administrative result thereby.

Good qualities: Tall to obedience of Qi Wu management, without skill requirement, operate austere.

Defect: Poorer to the purify expression of organic matter.

7, combustion law

Direct combustion law

It is certain to use the quantity of heat that lights the auxiliary fuel combustion such as gas or fuel to give off to heat gas mixture heat gas mixture temperature (700 — 800 ℃ ) , be stationed in the time with stay proper, make combustible harmful gas burns. This law craft simple, installation cost is little, but specific power consumption big, moving cost is high. To automobile manufacturing industry, of spray paint waste gas discharge often achieve hundred thousands of about a hundred 10 thousand wind force, because concentration is not high, the choice burns directly the law is too wasteful, and wasteful the sources of energy.

Catalytic combustion law

Waste gas of spray paint off-gas treatment heats 200 ℃ — 300 ℃ catalytic combustion, achieve depurative goal. The method of feebleminded bad news, purifying rate is high, do not have pollution 2 times, craft is simple, the operation is convenient. High temperature, Gao Nong spends organic off-gas treatment the processing of organic waste gas, do not apply to low density, wind force is large.

8, Absorb a law

Use draw fluid and response of each other of useless gas phase, the harmful material dissolve that makes waste gas medium is entered in absorbing fluid, make waste gas is able to purify thereby. Absorb fluid to deal with separately punishment.

Good qualities: Investment is small, moving expenditure is low, operate simple.

Defect: Deal with condemnatory obedience is low, not firm, purify obedience not tall, it is about 50% , inaccessible environmental protection asks, organic to low pH indicator waste gas, have pollution 2 times.

　　 9, condensation law

the condensation after direct condensation or adsorption condense waste gas, condensate reclaims via depart valuable organic matter. This law spends tall, temperature with Yu Nong off-gas treatment of hidebound of low, wind. But this law invests big, specific power consumption tall, moving fee is big, in spray paint waste gas ” 3 benzene ” reach consistency of other waste gas general under 300mg/m3, density is low, wind force is large (the wind force of workshop of spray paint of automobile manufacturing industry often is in above of 100 thousand class) , and the part of organic dissolvent in holding waste gas as a result of car besmear is complex, reclaiming dissolvent is handled hard use, produce pollution easily 2 times, besmear this method is not used commonly in installing off-gas treatment so.

Good qualities: Move firm, purify obedience tall.

Defect: Investment is larger, reach to the circumstance to operating personnel asks taller, and specific power consumption is too big, moving expense is high.

10, ionic law

Ionic law is to use plasma Plasma (ION plasma) degradation organic waste gas, dispel is effluvial, exterminate bacterium, virus, purifying air is the more sophisticated new and high technology on international, domestic and international expert says for science of 21 centuries environment one of 4 old techniques. The key of this technology is the formal generation that holds back discharge through high-pressured pulse medium a large number of active and ionic oxygen (plasma) , activation gas, produce all sorts of active freedom base, wait like OH, HO2, O, hydrocarbon of angry to benzene, toluene, xylene, ammonia, alkyl kind wait for organic waste gas to produce the complex physics such as degradation, oxidation and chemical reaction, and by-product is avirulent, avoid 2 times to pollute. This technology has specific power consumption extremely low, cover an area of a space small, move safeguard wait for a characteristic simply, particularly applicable the processing of a variety of constituent gas.

Above is small book smallness spray paint room the data related off-gas treatment, consult for everybody! The enterprise should use the environmental protection coating, use amount that raise the utilization rate of coating and reduces coating as far as possible, in order to reduce amount of exhaust emission of besmear outfit workshop. When processing besmear holds waste gas, want to produce the situation such as chroma, wind force actually in the light of waste gas, choose appropriate waste gas to administer means.