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    Treatment Scheme of Catalytic Combustion Exhaust Gas

    来源:传梦催化燃烧 整理发布   时间:2019-08-25

    Treatment Scheme of Catalytic Combustion Exhaust Gas
    Our dream of environmental protection will be discussed from the following three aspects
    I. Process Flow of Catalytic Combustion Exhaust Gas Treatment
    The treatment process of catalytic combustion exhaust gas in our company is three stages: adsorption-desorption-combustion. With the high efficiency of activated carbon in adsorbing exhaust gas, we first let activated carbon adsorb organic exhaust gas, and then let activated carbon desorb through high temperature airflow, so that activated carbon can be recycled repeatedly to adsorb and desorb the exhaust gas. Where to go, the desorbed exhaust gas is concentrated, then sent to the catalytic combustion chamber for catalytic combustion decomposition and heat release, and then under the action of heat exchanger, the exhaust gas concentration can reach more than 2000 PPM, so that the exhaust gas can burn repeatedly and naturally in the combustion bed without additional heating. After catalytic combustion, a part of the exhaust gas is discharged into the atmosphere, and most of the exhaust gas is returned to the adsorption bed to desorb activated carbon, forming a reciprocating system, which can better provide the heat of adsorbing and desorbing catalysis for catalytic combustion equipment and more energy-saving, environmental protection and efficiency.
    2. Efficiency of catalytic combustion exhaust gas treatment
    Analysis of Influencing Factors on Catalytic Combustion Performance
    1. Effect of Intake Concentration on Catalytic Performance
    (Data Reference Source: Environment and Development) Author: Li Chunyai) Taking the non-methane total hydrocarbons as the research object, the intake air concentration is in the range of 150 mg/L-300 mg/L, the intake air volume is 2500 m3/h, the space velocity is 10 000 h-1, and the catalytic temperature is 250 C. The effect of the intake air concentration of non-methane total hydrocarbons on the catalytic performance is investigated by single factor test. The experimental results are shown in Fig. 2.


    The results show that the inlet gas concentration of non-methane hydrocarbons has some influence on the catalytic performance. When the inlet gas concentration of non-methane hydrocarbons is lower than 200 mg/L, the removal rate is not more than 90%. When the inlet gas concentration is higher than 200 mg/L, the catalytic performance tends to be stable, and the removal rate is more than 96%. The reason may be that when the intake concentration is low, the combustion is insufficient when the intake concentration is too low and no combustion promoter is added. Only when the intake concentration reaches a certain value, under the set experimental conditions, the catalytic combustion reaction is sufficient and the progress concentration continues to increase, and the catalytic performance changes little.
    The effects of different catalytic temperatures on the catalytic performance were investigated by single factor test, with the inlet air volume of 2500m3/h, the space velocity of 10000h-1 and the inlet air concentration of 210 mg/L. The specific test results are shown in Fig. 3.


    As can be seen from the above figure, the removal rate of non-methane total hydrocarbons increases with the increase of catalytic temperature. When the catalytic temperature is lower than 220 C, the removal rate of non-methane total hydrocarbons is lower than 90%. When the temperature rises to 240 C-350 C, the catalytic performance reaches the best, and the removal rate of non-methane total hydrocarbons keeps about 98%. However, after 350 C, the catalytic performance keeps constant. Gradually weakening. Therefore, under the experimental conditions, the optimum temperature parameters for catalytic performance are 240 ~350 C.
    2. Effect of Space Velocity on Catalytic Performance
    Space velocity is an important parameter in the design of catalytic combustion process. In this section, the effects of space velocity on catalytic performance are studied under the conditions of air intake volume 2500 m3/h, catalytic temperature 250 C and air intake concentration 210 mg/L. The single factor test method is used to set the space velocity between 10 000 H-1 and 50 000 h-1.


    The above chart shows that the removal rate of non-methane hydrocarbons decreases slightly within 10 000 h-1-25 000 h-1, but when the space velocity exceeds 25 000 h-1, the effect on the catalytic performance begins to increase, and when the space velocity is 50 000 h-1, the removal rate of non-methane hydrocarbons is only 41.43%. The main reason is the large space velocity. Some of the organic waste gases in catalytic combustors are taken out of the reactor before they are fully contacted with the catalyst. The inadequate catalytic reaction affects the catalytic performance and results in low removal rate.
    Generally speaking, the treatment efficiency of catalytic combustion exhaust gas can reach about 98% at low air volume of about 350 C. So I suggest that your company give priority to choice. Our company has promised to undertake the production of environmental impact assessment standards! Give you zero risk commitment.
    3. Design Standards for Catalytic Combustion


    According to the current national policy, activated carbon adsorption and UV photocatalysis equipment have gradually failed to meet the policy requirements, catalytic combustion equipment is currently in line with the national policy requirements of environmental protection equipment.

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