Printing product ink treatment workshop waste gas collection method and purification process
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With the increasing smog, people's environmental protection is also increasing. In recent years, the state has vigorously rectified the environmental pollution industry, and introduced a series of laws and regulations to ensure the effective implementation of environmental protection measures. Among them, the printing industry will contain a large amount of volatile gas in the printing ink to destroy the environment. Therefore, it is necessary to treat the exhaust gas according to relevant requirements and laws and regulations before it can be discharged.
At present, solvent-based inks which are widely used in the printing process of packaging plastic substrates in China, contain 50%-60% of volatile components. If the diluent required for adjusting the viscosity of the ink is added, the volatiles are evaporated when the printed products are dried. The total content of the ink component is from 70% to 80%. The gases volatilized by these organic solvents enter the human body through breathing, causing damage to the liver and nervous system of the human body; organic compounds are emitted into the atmosphere, react with nitrogen oxides, photochemical reactions occur, and photochemical oxidants are formed to destroy forests and destroy ecology. surroundings.
For example, in the packaging and printing factory, the main products are printed products of various plastic films. Color inks and organic thinners are widely used in production, and the thinner (solvent) for ink is mainly toluene, ethyl acetate, acetone and a small amount of methyl ethyl ketone. These solvents are discharged into the VOCs as a large amount of exhaust gas during the production process. Therefore, the VOCs exhaust gas discharged from the packaging and printing plant production workshop must be treated by an effective collection method and purification process.
The principles of ink printing exhaust equipment selection should be followed:
1. Based on the principle of combining long-term development of the enterprise with current actual needs, reasonably determine the project scale and technological plan;
2. Under the premise of ensuring the discharge of exhaust gas to the standard, try to choose the construction plan with low investment, low operating cost and small floor space;
3. The determined process technology must be easy to operate and manage, and at the same time have strong impact resistance characteristics.
Qingdao Zhaoxing is a professional manufacturer of organic waste gas treatment equipment and solutions. It has many years of experience in organic waste gas treatment and successful cases. The ink printing exhaust gas treatment equipment developed by Zhaoxing Environmental Protection Co., Ltd. is a processing technology with photocatalytic oxidation as the core.
The photo-oxidation catalytic waste gas treatment device adopts the ultraviolet light source to purify the molecular chain of the exhaust gas, and uses the 253.7 nm band light-cutting, chain-breaking, burning, cracking the exhaust gas molecular chain to change the molecular structure, and is the first heavy treatment;
The 185 nm band of light is used to catalytically oxidize the exhaust gas molecules, so that the destroyed molecules or neutrons and atoms are combined by O3, so that the molecular chain of the organic or inorganic polymer malodorous compound is converted into a low molecular compound CO2 during the catalytic oxidation process. , H2O, etc., is the second heavy treatment; and then more than 8 kinds of corresponding inert catalysts are arranged according to different exhaust gas components, the catalyst adopts a honeycomb metal mesh as a carrier, and is in contact with the light source in all directions, and the inert catalyst occurs below the 338 nm light source. The catalytic reaction amplifies the effect of 10-30 times of the light source to fully react with the exhaust gas, shortens the contact time between the exhaust gas and the light source, thereby improving the exhaust gas purification efficiency, and the catalyst has a similar effect to the photosynthesis of the plant, and purifies the exhaust gas. Reprocessing.
The exhaust gas after triple treatment has a deodorization of up to 99%, and the purification and deodorization effect greatly exceeds the national odor emission standard (GB) promulgated in 1993.