为了探讨自制高风速复合式电收尘器(HVCESP)的收尘效果,对其进行了模拟烟气粉尘净化实验研究并探讨了其收尘机理。以收尘效率17作为收尘指标,以粉尘初始质量浓度ρ0、工作电压U、有效收尘面积S及烟气风速v作为影响因素进行单因素分析,分别考查各因素对η的影响规律。实验结果表明,当烟气处理量qv,=3780m^3/h,v—1.75m/s,ρ0=5g/m^3,U=47kV,有效收尘面积S=14.5m^2,异极距H=0.17m,有效电场长度L=2.8m时,η可达95%;当qv=1787m^3/h,v=0.81m/s,而其它条件不变时,17可达99.54%。HVCESP除尘系统比传统电收尘器(ESP)体积缩小几倍,实现了除尘设备小型化,降低了其一次性投资。
In order to obtain a higher dust collecting efficiency, the velocity in ESP should fall to be 0. 6 to 1.2 m/s, and usually dusts stay in ESP for 4 to 5s. So, the traditional ESP usually has a huge volume, wastes a lot of steel, and its one-off investment is large. A new combined type electrostatic precipitator with high gas velocity (HVCESP) is introduced in this paper, it adopts the double C type dust-collection plates. The double C type dust-collection plates can restrain the dust particles from vibration in the double C troughs, in addition to the inhibitory effect by the electric field, the dust particles are not easy to produce re-entrainment phenomena. Because the gas flow detours along the surface of the dust-collection plates, the movement path of dust particles is greatly lengthened, in addition to the advancement function of the gas flow to the dust particles, they can be driven to the dust-collection plates in a short time by higher velocity. Thus, the section area, length and volume of the ESP are reduced by several times compared to the traditional ESP, and the miniaturization of ESP is realized, and its one-off investment is greatly reduced. In this paper, experiments of simulating flue gas purification are carried using the sel/-designed HVCESP (The combined type electrostatic precipitator with high gas velocity) system, and dust collecting mechanism is also discussed. The influence rules of the factors on dust collecting efficiency are examined, such as initial dust density, working voltage, effective dust collecting area and gas velocity. The experimental results show that the dust collecting efficiency can be increased to above 95%, when the volumetric flow of flue gas is 3860 m^3/h, the gas velocity is 1.75m/s, initial dust density is 5 g/ms, working voltage is 47 kV, the distance from wire to plate is about 0. 17 m, the length of effective electric field is 2. 8m,and the area of effective dust collecting plates is 14. 5 m2. The dust collecting efficiency can be increased to 99. 54%, wh