| China's fuel composition is mainly coal,coal combustion accounts for about 80%of the total energy consumption,so coal combustion is the main source of air pollution.Nowadays,for the removal of sulfur oxides from industrial flue gas,wet desulfurization process accounts for about 85%of the total installed capacity of desulfurization in the world.Among them,ammonia desulfurization has been encouraged by the policies of relevant environmental protection departments for its high efficiency,no secondary pollution and suitable for high-sulfur coal burning,which has been rapidly popularized and applied in China.However,in the process of ammonia desulfurization,a large number of ammonium sulphide aerosol particles,the particle size of which is concentrated below 2.5pm,are difficult to effectively remove the existing environmental protection equipment,resulting in serious gas trailing phenomenon.Based on the independent construction of single channel,single electric field electric experiment platform to simulate the ammonium sulphate aerosol electric trap characteristics experiments,by changing the electric field voltage,discharge electrode type,electric wind velocity and particle concentration,relying on the ELPI(electrical low-pressure impactor)online sampling testing analysis of quality and quantity of fine particulate matter concentrations,calculation analysis of ammonium sulphate aerosol particles effectively drive into the speed of classification removal efficiency,by measuring the load capacity of the different size section of particles charged characteristics of ammonium sulphate aerosols are studied,for efficient removal for eps ammonium sulphate aerosols and provides the theory basis for design and optimization,The research results have important practical significance for effectively controlling the emission of fine particles from industrial smoke.The main research results of this paper are as follows:(1)with the increase of voltage,the fractional removal efficiency of ammonium sulfide aerosol with mass concentration and quantity concentration increases;At 25kV,the electric fieldintensity between the wire plates is not enough to cause the orientation movement of ultrafine particles.At 50kV,the removal efficiency of PM0.1 mass concentration reached 41.3%and the quantity concentration 43.5%.The median diameter of 0.756?m particles showed greater removal efficiency,mass concentration removal efficiency of 59.8%,and quantity concentration removal efficiency of 66.3%.(2)changing the type of discharge electrode has no significant impact on the removal efficiency of the number of particles in the particle size section above 1?m,while the removal efficiency of ultra-fine particles below 0.1 ?m has significant changes.The best removal efficiency of double Angle steel wire is 41.3%higher than the sawtooth wire 35.9%up to 5.4%.(3)the effect of changing electric field wind speed on PM10 quantity concentration is greater than that of mass concentration.When wind speed is 1.0m/s and voltage is 50kV,the removal efficiency of PM10 quantity concentration and mass concentration is 44.24%and 62.23%respectively.(4)the charged electric quantity of particles increases with the increase of particle size.At 25kV,the charged electric quantity of a single particle with the maximum particle size is less than 2e.At 40kV,the particle size above 1?m is fully charged,and the median diameter of 7.284?m particle charge reaches 73e.At 50kV,the total charge of ultrafine particles with particle size below 0.1?m was 8e.The median diameter 0.756?m particle charge reached 18e.(5)the change of electric field wind speed has little impact on PMi charge,>1?m particle charge decreases gradually with the increase of wind speed,the median diameter is 7.284?m particle,the average charge value of single particle is 67.63e when the wind speed is 1.0m/s,and increases to 78.48e when the wind speed is 0.2m/s. |
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