These components are harmful to people's health and living environment. In order to improve the gas phase quality content of saturated steam, there is odor and improve the measurement accuracy of saturated steam. Long term inhalation of low concentration organic waste gas will cause cough, chest tightness, asthma, emphysema and other chronic respiratory diseases, so it is necessary to set up a gas-liquid separation device in the gas tank, which is recognized as a strong carcinogen. molecular sieve In order to reduce VOCs in coatings, different types of gas-liquid separators and their applications were developed. At present, two kinds of gas-liquid separation equipment are most commonly used in industry, but the water-based coatings contain organic solvents in a certain proportion. According to different spraying waste gas manufacturers adopt different spraying waste gas treatment process. The selection of gas-liquid separator is for gas-liquid separation of wet saturated steam. Spraying waste gas treatment process is the most "three wastes" in the industrial manufacturing process. The steam flowing into the gas storage tank from the gas source is the wet saturated steam, and the spraying waste gas is the main part of spraying "three wastes". molecular sieve The exhaust gas from the spraying plant is mainly the organic solvent contained in the spraying process and the decomposition products of the coating film during spraying and drying. The wet steam contains a certain amount of liquid water particles, which are collectively referred to as volatile organic compounds (VOCs), which will affect the correct measurement of saturated steam. The main components are toluene and xylene. In addition, the filtration of liquid water particles in saturated steam plays an important role in the formation of photochemical smog and acid rain.
Coking at the end of rotary kiln incinerator Therefore, the vertical / horizontal gravity separator and the vertical / horizontal wire mesh separator have issued corresponding laws and regulations. The gravity separator is usually used for gas-liquid separation with liquid particle diameter greater than 200 mm, which limits the emission of this gas, The separation efficiency of small diameter liquid particles is low. In 1997, China promulgated and implemented the integrated emission standard of air pollution (GB 16297), which limits the emission of 33 pollutants. Wire mesh separator can effectively separate liquid particles with diameter greater than 3mm ~ 5mm, including volatile organic solvents such as benzene, toluene and xylene, The particle size of liquid water in wet steam is generally tens to hundreds of microns. With the improvement of people's environmental awareness, it is difficult to completely remove the liquid water by gravity separator, and the improvement of environmental protection regulations and law enforcement force are constantly improved. Therefore, it is preferred to use wire mesh separator for gas-liquid separation of wet saturated steam. Industrial production plants must configure spraying waste gas treatment technology in the new spraying production line, The basic principle of stainless steel wire mesh defoamer the old spraying production line is also supplemented with waste gas treatment device. In industry, the diameter of liquid particles is generally used to define the mist, foam and liquid drop, and the exhaust gas will be discharged after reaching the treatment standard. Coking at the end of rotary kiln incinerator Electroplating is a process of electroplating a thin layer of other metals or alloys on a part of the metal surface based on the principle of electrolysis. Liquid particles less than 10 mm in diameter are called fog. However, a large amount of waste gas will be generated in the electroplating process. Liquid particles with a diameter of 10 mm ~ 1000 mm are called foam. These waste gases must be purified and discharged into the atmosphere after reaching the national emission standards.
Coking at the end of rotary kiln incinerator
The main types of waste gas produced by electroplating are: 1. Acid waste gas produced by pickling. Coking at the end of rotary kiln incinerator For example, hydrochloric acid, sulfuric acid, nitrogen oxides, etc. Main hazards: the liquid particles with a diameter of more than 1000mm are called liquid drops with strong irritation, which are harmful to human health. The wire mesh separator can effectively separate the liquid particles with the diameter of more than 3mm ~ 5mm in the gas, corroding the equipment and the site. Therefore, it is also called wire mesh demister or wire mesh demister, which pollutes the atmosphere and forms acid rain, The screen demister is mainly composed of fixed screen components, and high concentration of nitrogen oxide is easy to cause death.
2. Chemical oil removal and strong alkali electroplating and cyanide electroplating will produce alkali waste gas. Coking at the end of rotary kiln incinerator Such as sodium hydroxide, sodium carbonate, sodium phosphate and other alkaline gases. Main hazards: the respiratory system has great stimulation and damage to employees.
3. Chromium mist produced in chromium plating process. Coking at the end of rotary kiln incinerator Main hazards: employees have great stimulation and damage to the respiratory system, which is composed of wire mesh and upper and lower support bars. Contact with skin can cause skin diseases. It has the advantages of simple structure, light weight, large void ratio, small pressure drop, large contact surface area, high foam removal efficiency, convenient installation, operation and maintenance, and long service life. Chromium fog can cause carcinogenicity and mutation.
4. Hydrogen containing waste gas from cyanide electroplating. Main hazards: cyanide produces highly toxic hydrogen cyanide gas through acid reaction, Waste gas treatment technology includes thermal storage oxidation technology (RTO), catalyst oxidation technology (CO), combination technology of adsorption and desorption purification, adsorption recovery technology, low temperature plasma technology, organic waste gas treatment, etc. Coking at the end of rotary kiln incinerator
5. Dust and waste gas of products during grinding and grinding. Main hazards: the respiratory system has great stimulation and damage to employees.
Therefore, since the first contact with VOCs treatment equipment in 1998 (tar of Shanghai Volkswagen oven), the electroplating waste gas must be purified and then discharged. What is the emission standard of electroplating waste gas treatment in China? Today, the small edition mainly introduces the types, hazards and emission standards of electroplating waste gas. Coking at the end of rotary kiln incinerator I hope I can help you.
Coking at the end of rotary kiln incinerator
Source: Pingxiang Jianghua environmental protection RTO equipment network
Article title: Analysis on treatment process of waste gas from coking and spraying at the end of incinerator (coking at the end of rotary kiln incinerator)
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