Analysis of coating machine exhaust treatment methods

Coating machine is mainly used for paper, film, cloth and other composite materials process production process, the application is more widely used, mainly used in paper, film and other substrates. Because the coating process uses a large amount of organic solvents, emissions and fugitive VOCs organic exhaust will also increase, the end of the exhaust treatment has also become important, the following with the Everest blue editorial to take a look at the analysis of the coating machine exhaust treatment methods.

Characteristics of organic waste gas emissions in the coating industry:

Large and concentrated emissions

High concentration of exhaust gases emitted

Emission source of coater exhaust:

Coater exhaust is mainly pointed out that the main emission and fugitive links in the production process for the coating and drying process, exhaust pollutants to ethyl acetate, butanone, propylene glycol, methyl ether, dimethyl alcohol, benzene, isopropanol and other VOCs organic pollutants are predominant.

General method of waste gas treatment of coating machine

Activated carbon adsorption method

The main principle of activated carbon adsorption method is to use porous solid adsorbent (activated carbon, silica gel, molecular sieve, etc.) to deal with organic waste gas, so that through the chemical bonding force or molecular gravity to fully adsorb the harmful components and adsorbed on the surface of the adsorbent, so as to achieve the purpose of purifying the organic waste gas. The adsorption method is mainly applied to the purification of organic waste gas with large air volume, low concentration (≤800mg/m3), no particles, no viscous matter, and low concentration of organic waste gas at room temperature.

Activated carbon purification rate is high (activated carbon adsorption can reach more than 95%), practical and widespread, simple operation, low investment. In the adsorption of saturation after the need to replace the new activated carbon, replacement of activated carbon needs to spend, replace the saturated activated carbon is also needed to find professional staff for hazardous waste treatment, high operating costs.

Catalytic combustion method

Combustion method only in the volatile organic compounds in high temperature and air under the premise of complete combustion, decomposition into CO2 and H2O. combustion method for all types of organic waste gas, can be divided into direct combustion, thermal combustion and catalytic combustion.

RCO technology refers to the role of the catalyst, so that the hydrocarbons in the organic waste gas at a lower temperature under the premise (200 ~ 400 ℃) rapid oxidation into water and carbon dioxide, to achieve the purpose of management.

Catalytic combustion technology refers to a waste gas treatment method in which the combustible components in the waste gas are thoroughly oxidised and decomposed under the action of catalysts at lower temperatures (200～400℃) so that the negative gas is purified and treated. Catalytic combustion waste gas treatment is a typical gas-solid phase catalytic reaction, the real nature of the active oxygen involved in the depth of oxidation. In the process of catalytic combustion, the role of the catalyst is to reduce the activation energy of the reaction, and at the same time make the reactant molecules enriched on the surface of the catalyst, in order to improve the reaction rate. With the help of catalyst, organic waste gas can be flamelessly combusted under the premise of low ignition temperature, and oxidatively decomposed into CO2 and H2O, while releasing a large amount of heat.