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After the combustion exhaust gas passes through the water film dust collector, what is the removal rate of sulfur dioxide? Is there any basis for the efficiency of sulfur dioxide treatment?

Author: posted on:2020/9/28 15:38:56 Click volume:

It uses the principle of so2 soluble in water and acid-base neutralization. It's simple. The basic principle of alkaline desulfurization: the absorption of sulfur dioxide in flue gas can be summarized as physical absorption and chemical absorption. Physical absorption means that sulfur dioxide is simply absorbed by water, and its characteristic is that as the water temperature increases, the amount of gas absorbed decreases. The degree of physical absorption depends on the gas-liquid balance, as long as the partial pressure absorbed in the gas phase is greater than the partial pressure of the gas when the liquid phase is in equilibrium. The absorption process will proceed. Because the driving force of physical absorption is small, the absorption rate is low. Therefore, the water in the dust collector absorbs the sulfur dioxide in the flue gas, and the absorption rate will not exceed 15%. The chemical absorption has a very high absorption rate. The principle is: the absorbed sulfur dioxide gas chemically reacts with the alkaline absorption solution, causing changes in the sulfur dioxide gas and the lye composition, effectively reducing the absorption of sulfur dioxide gas on the surface of the solution. The partial pressure increases the driving force of the absorption process. Therefore, the chemical absorption rate can reach more than 60%. The main factor affecting the absorption of sulfur dioxide by lye is the alkali concentration. When the concentration of lye is low, the rate of chemical mass transfer is low; when the concentration of lye is increased, the rate of mass transfer also increases; when the concentration of lye increases to a certain value, the rate of mass transfer reaches the maximum . The concentration of lye at this time is called the critical concentration. When the lye concentration is higher than the critical concentration, the mass transfer rate does not increase. For this reason, in the chemical absorption process of flue gas desulfurization, when lye is used to absorb and oxidize sulfur in the flue gas, the concentration of lye is appropriately increased to increase the absorption rate of sulfur dioxide. However, the concentration of lye cannot exceed the critical concentration. When the critical concentration is exceeded, the desulfurization efficiency cannot be improved. The optimal concentration of lye is the critical concentration, at this time, the desulfurization efficiency is the highest. The amount of coal-fired flue gas of the boiler and the emission of various pollutants in the flue gas are calculated using the calculation method given in the "Environmental Statistics Manual". A. Flue gas volume V0=0.251×QL/1000+0.278Vy=1.04×QL/4178+0.77+1.0161 (α-1) V0 where: V0-theoretical air volume, Nm³/kg; Vy-flue gas emission volume, Nm³/kg; QL-fuel low calorific value, KJ/kg, take 23030KJ/kg; α-excess air coefficient, take 1.8. According to the above model, the actual amount of flue gas produced per kilogram of coal is 11.4m³/kg. According to the boiler's coal burning volume of 1758.3t/a, the flue gas emission is calculated to be 2.0×107m³/a. B. The amount of smoke and dust Gd=1000•B•A•dfh•(1-η)/(1-Cfh) where: Gd-smoke emission, t/a; B-fuel consumption, t/a; A- The ash content of coal is taken as 20.8%; dfh-the percentage of soot in the flue gas, taken as 15%; η-the efficiency of the dust collector, with a total design efficiency of 95%; Cfh-the combustible content in the smoke and dust, taken as 30%. C. SO2 emission GSO2=1.6•B•S(1-ηs) where: GSO2-SO2 emission, t/a; B-fuel consumption, t/a; S-coal total sulfur content, %, take 0.5%; ηs-desulfurization rate, %, designed to be 60%.

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