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高温烤漆房废气处理设备
高温喷漆、烤漆房加工过程中会产生多种有害气体，主要有苯系物、非甲烷总烃等有机物,其化学成分复杂，且产品的原料不同，成分和浓度不一，因此处理方法也是多种多样。下面简单的介绍几点。
1、催化燃烧法:将废气加热到200~300℃经过催化床燃烧,达到净化目的.该法能耗低、净化率高、无二次污染、工艺简单操作方便.适用于高温高浓度的有机废气治理,不适用于低浓度、大风量的有机废气治理。
2、直接燃烧法:利用燃气或燃油等辅助燃料燃烧放出的热量将混合气体加热到一定温度(700-800℃),驻留一定的时间,使可燃的有害气体燃烧.该法工艺简单、设备投资少,但能耗大、运行成本高。
3、吸附法:
(1)直接吸附法:有机气体直接通过活性炭颗粒或活性炭过滤棉,可达到95%的净化率,设备简单、投资小、操作方便,但需经常更换活性炭,用于浓度低、污染物不需回收的场合。
(2)吸附回收法:有机气体经活性炭吸附,活性炭饱和后用热空气进行脱附再生。
4、水喷淋法:水喷淋工艺在大气污染处理上有着广泛的应用,在喷涂工序中也得到使用,例如水帘柜就是一例,其原理是通过将水喷洒废气,将废气中的水溶性或大颗粒成分沉降下来,达到污染物与洁净气体分离的目的.其优点是水资源易得,同时经过过滤、沉淀后可回用,最大限度降低水资源的浪费,水喷淋在处理大颗粒成分上有着相当高的效率,常作为废气处理的预处理。
5、凝回收法:将废气直接冷凝或吸附浓缩后冷凝,冷凝液经分离回收有价值的有机物.该法用于浓度高、温度低、风量小的废气处理.但此法投资大、能耗高、运行费用大,因此无特殊需要,一般不采用此法。
6、吸收法:可分为化学吸收和物理吸收,但"三苯"废气化学活性低,一般不采用化学吸收.物理吸收是选用具有较小的挥发性的液体吸收剂,它与被吸收组分有较高的亲和力,吸收饱和后经加热解析冷却后重新使用.该法用于大气量、温度低、浓度低的废气.装置复杂、投资大,吸收液的选用比较困难,存在二次污染。
High temperature paint, paint the process will produce a variety of harmful gases, mainly benzene, NMHC and other organic matter, its chemical composition is complex, and different products, raw materials, ingredients and concentrations vary, so the approach is more species diversity. Following is a brief introduction to a few points.
1, the catalytic combustion method: the exhaust gas is heated to 200 ~ 300 ℃ after catalytic bed combustion, low energy consumption and to purify the purpose of the Act, purification rate, no secondary pollution, easy to operate simple process suitable for high temperature and high concentration of organic. waste gas treatment, does not apply to low concentration, high winds organic waste gas treatment.
2, the direct combustion method: the use of auxiliary fuel such as gas or oil heat released by burning the mixed gas is heated to a certain temperature (700-800 ℃), resides a certain time, so that the combustion of the combustible gases harmful process is simple, equipment. less investment, but energy consumption, high operating costs.
3, adsorption method:
(1) Direct assay: organic gases directly through the activated carbon particles or activated carbon filter cotton, up to 95% of the purification rate, simple equipment, low investment, easy to operate, but need to be changed frequently activated carbon for low concentration of pollutants without recycling occasions.
(2) adsorption recovery method: organic vapors by activated carbon adsorption, activated carbon saturated with hot air desorption regeneration.
4, water spray method: water spray in air pollution treatment technology has been widely used in the spraying process has also been used, such as curtain cabinet is an example, which works by spraying water exhaust, the exhaust gas of an aqueous or large grains settle to achieve the purpose of contaminants and clean gas separation. the advantage is easy to get water, and after filtration, the precipitate can be reused to minimize waste of water resources, water spray in the processing It has a very high efficiency particulate components, often as a pretreatment of waste gas treatment.
5, condensate recovery process: After the exhaust direct condensation or adsorption concentrated condensate, condensate by separating and recovering valuable organic matter which method is used to a high concentration, low temperature, small amount of wind, but this method of exhaust gas treating large investment and energy consumption. high operating costs big, so no special needs, generally do not use this method.
6, the absorption method: can be divided into chemical absorption and physical absorption, but the "BTX" low exhaust chemical activity, generally do not use chemical absorption is the choice of having a smaller physical absorption of volatile liquid absorbent, it is absorbed by the group points higher affinity absorption saturation by heating resolve reused after cooling. this method is used to the atmosphere, temperature, low concentrations of exhaust gas apparatus complex, large investment, the choice is more difficult to absorb liquid, there is no secondary pollution .
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