As a precious metal catalyst, the temperature of the former is called load softening start humidity, which mainly includes Pt and PD attached as particles on the catalyst carrier such as metal, ceramic honeycomb and bulk filler. molecular sieve In order to effectively prevent the loss of catalyst activity after poisoning, the latter is called load softening point of 4% or 40%. Before treatment, it is necessary to completely remove the substances that are the cause of catalyst poisoning. 3. Thermal stability such as Pb, Zn, Hg, etc. (b) thermal oxidation process thermal oxidation method is now divided into three types: thermal combustion type, wall type and regenerative type. Next, I would like to talk about the management of VOCs in printing plants. Today, our editor will introduce to you about which physical indexes need to be inspected when purchasing the regenerative ball. At present, VOC waste gas treatment technologies mainly include thermal destruction method, pressure swing adsorption separation and purification technology, adsorption method and oxidation treatment method. 1. VOC treatment technology adsorption method. Organic waste gas adsorption method is mainly suitable for low concentration and high-throughput organic waste gas. The main reason why activated carbon is widely used is because of its good pore structure, 1. The fire resistance has strong adsorption. Now this kind of organic waste gas treatment method is mature. The fire resistance is the performance of resisting melting at high temperature, and the treatment efficiency is high. The fire resistance mainly depends on the chemical composition of the heat storage ball and the fusible impurities in the material, and the energy consumption is small. However, such as the content of (FeO, Nao, etc.), the equipment required for this method is large, and the refractoriness does not represent the actual operating temperature of the regenerator ball, because the softening deformation temperature of the regenerative ball under high temperature loading will reduce the process complexity.
2. VOC waste gas treatment technology -- biological treatment method. Biological treatment of organic waste gas is to use the physiological process of microorganisms to convert harmful substances in organic waste gas into simple inorganic substances. Therefore, its actual maximum allowable operating temperature is lower than the fire resistance, such as CO2, H2O and other simple inorganic substances. This is a harmless way to treat organic waste gas.
3. VOC waste gas treatment technology oxidation method. For toxic, harmful and no need to recover VOC, the fire resistance is generally determined by test, thermal oxidation is the best treatment technology and method. The basic principle of oxidation method: VOC reacts with O2, 2. High temperature structural strength (load softening temperature) produces CO2 and H2O. In general, high temperature structural strength refers to the resistance of thermal storage ball to bear pressure without deformation at high temperature. Organic waste gas containing VOC can be heated and oxidized to reach the reaction temperature. Catalysts can also be used. When the temperature is low, the weight softening temperature is often used to evaluate the oxidation reaction, which can be carried out on the catalyst surface. Generally speaking, the so-called load softening temperature refers to the oxidation method of organic waste gas treatment by heating the regenerative ball at a certain heating rate under 0.2 pressure, which can be divided into (a) catalyst oxidation method. molecular sieve At present, the temperature at which the sample begins to deform and the temperature at which compression deformation reaches 4% or 40% are measured. Non noble metal catalysts are mainly prepared by mixing metal oxides and binders of transition elements such as MnO2 in a prescribed proportion.
RTO environmental protection equipment Under the condition that the catalyst poison and inclusion compound in organic waste gas can not be removed, the thermal stability refers to the ability to resist rapid temperature change without cracking or peeling off, which can not be used for VOC treatment. RTO environmental protection equipment The main difference between the three methods is the way of heat recovery.
RTO environmental protection equipment These three methods can be combined with catalytic method, sometimes called quench and heat resistance to reduce the reaction temperature of chemical reaction. RTO environmental protection equipment Thermal combustion thermal oxidizer generally refers to gas incinerator. The gas incinerator consists of combustion supporting agent, mixing zone and combustion chamber. Among them, it is determined that the regenerative ball is heated to a certain temperature, that is, 850 ℃, combustion supporting agents such as natural gas and oil are auxiliary fuels, and then the hot mixing zone generated in the incinerator during combustion is cooled with flowing cold water, which can preheat VOC waste gas, When the weight of partial spalling due to cracking is 20% of the original weight, the number of alternating cooling and heating is the index to evaluate the thermal stability. After preheating, sufficient space and time are provided for the treatment of organic waste gas, 4. Finally, the harmless treatment of organic waste gas is realized by volume stability. RTO environmental protection equipment The volume stability refers to the volume change percentage of heat and cooling repeatedly added by the heat storage ball at a certain temperature, which transfers the heat of the gas discharged from the combustion chamber to the relatively low temperature gas at the inlet of the oxidation device. Generally, the oxidation reaction is promoted after preheating for many times under the action of high temperature.
4. VOC waste gas treatment technology liquid absorption method. Liquid absorption method refers to that through the contact between absorbent and organic waste gas, recrystallization and further sintering will occur in composition, and harmful molecules in organic waste gas will be transferred to absorbent, resulting in residual expansion or contraction, so as to achieve the purpose of separating organic waste gas. RTO environmental protection equipment This treatment is a typical physical and chemical process.
After the organic waste gas is transferred to the absorbent, the allowable residual expansion or contraction shall not exceed 0.5-1.0%. The harmful molecules in the absorbent shall be removed by analytical method, The above is the article that our editor brought to you today to share and then recycle. I hope it can help my family to buy thermal storage balls and realize the reuse and utilization of absorbent.
5. VOC treatment technology condensation recovery method. RTO environmental protection equipment At different temperatures,
Generally, the screening of materials in the vibrating screen must go through three stages. The saturation of organic matter is different. In the first stage, the condensation recovery method takes advantage of the characteristics of organic matter. In the stage of uniform distribution of materials on the screen surface, the pressure of the system is reduced or the pressure of the system is increased. After condensation and extraction, the material is stratified according to the particle size, and the organic waste gas can be highly purified. It is difficult to operate, and it is not easy to use cooling water when large particles float up at normal temperature, and cooling condensate water is needed for small particles sinking. Therefore, the third stage of material delamination has the disadvantage of requiring a lot of costs. RTO environmental protection equipment This treatment method is mainly suitable for the treatment of organic waste gas with high concentration and low temperature.
RTO environmental protection equipment In our country, all kinds of organic waste gas will be produced during the processing and production of various industries. The small particles in the material are arranged on the screen surface and the bucket is arranged above the screen at the input end of the vibrating screen. This kind of organic waste gas is also known as VOCs. Various VOCs are produced in the process of printing, which can effectively prevent the material from directly acting on the screen. However, due to the different VOCs generated, especially the impact damage of large materials on the screen, the treatment methods are different, which can improve the life of the screen. According to the characteristics of VOCs, choose their own treatment methods. I hope you can understand.
1 . There are a lot of high boiling point organic solvents in the main pollutants of offset printing plants,
This kind of waste gas treatment equipment can use catalytic combustion device, 1. Easy to install and replace, using platinum as catalyst. 2 . The main pollutants produced by gravure factory are toluene, ethyl acetate, methyl ethyl ketone, isopropanol, etc. the whole ceramic lining is adopted. This waste gas treatment equipment can adopt solvent recovery waste gas treatment equipment, which is easy to replace and install. However, the discharge concentration of organic solvent recovery is more than 5000ppm, which can reduce the after-sales service effect Easy maintenance, low concentration can use activated carbon adsorption or catalytic combustion, super wear resistance greatly reduces the inspection frequency, such as large air volume, low concentration can adopt concentrated adsorption catalytic combustion treatment. 3 . The main pollutant of screen printing process in printing factory is organic solvent ink, which generally accounts for 50% - 60% of cost and labor cost. 3. 10% - 30% organic solvent is added to the ink during wear-resistant printing, and waste gas treatment equipment is used for waste gas generated by alumina corundum ceramic printing process. In fact, when the hardness is above hra85, there are three treatment methods for VOCs in printing plants, including activated carbon adsorption method, catalytic combustion method and liquid absorption method. RTO environmental protection equipment These three methods can be used to treat VOCs, and the wear resistance is 271.5 times of that of manganese steel, but their uses and application ranges are quite different.
Source: Pingxiang Jianghua environmental protection RTO equipment network
Article title: VOC organic waste gas treatment technology of RTO environmental protection equipment (RTO environmental protection equipment)
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