Industrial process planning principles for industrial waste gas treatment equipment
Industrial waste gas processing equipment process, general activated carbon adsorption method, catalytic combustion method, direct combustion method, layered extraction recovery method, low-temperature plasma decomposition method, condensation recovery method.
Selection of this case and introduction of technological process
Process flow plan diagram:
Existing duct system → Adsorption process for organic waste gas → Paint mist filter box → Plasma purifier → Fan → 20m chimney
In combination with the above, the nature of this case belongs to low concentration, high air volume and large dust (paint mist) organic waste gas. In the design of the system, the investment cost and operating cost, as well as the stability and safety of the system should be considered. Decomposition method, without detailed analysis of other methods.
In the DOC treatment process of spraying organic waste gas, the filtering effect of the paint mist in the previous section is very important, mainly because the paint mist has the characteristics of easy solidification and strong adhesion. After solving this problem, the purification rate of the subsequent processing equipment can be greatly Improved; conventional filtration processes include water curtain filtration (with flocculant) and dry filtration (paint mist filter cotton), which are mostly determined by production processes and equipment. After the site survey, the water curtain of the spray booth in this case has greatly reduced its filtration efficiency due to long-term work. It is recommended to do maintenance and add flocculants. Considering to improve the purification rate and service life of the plasma, it is planned to add a dry filter in the previous section (Paint mist filter cotton), used to filter paint mist and water mist discharged from the wind.
The low-temperature plasma decomposition method is a new method developed for the treatment of low-concentration organic waste gas in recent years. It can decompose and purify benzene in the laboratory up to more than 85%. In practical applications, its purification rate is affected by operating conditions. It can also reach more than 70%. After several years of development, its application in the field of exhaust gas treatment has achieved considerable results and social benefits.