双V型均流式电除尘技术改造及流场优化

Modification and flow field optimization of double V type current-sharing electrostatic precipitator technology

为扎实推进钢铁行业超低排放改造,解决烧结机机头常规电除尘器无法满足出口粉尘浓度限值的问题,本文开发双V型均流式电除尘技术并通过CFD软件对电除尘器的布置进行模拟和优化,通过调整双V型均流式收尘板的布置型式,并在烟道处精准增设阻流板,提高气流均匀分布效果。数值模拟结果显示:采用双V型均流式电除尘改造方案后,电除尘器的气流分布均匀性系数(σ_(r)值)小于0.15,阻力从改造前的235 Pa降低到152 Pa,进出口烟道烟气流量的偏差在±5%的范围内;采用双V型均流式收尘板朝内收拢的布置消除了中间位置的局部高速区与两边的局部低速区。双V型均流式电除尘技术可为烧结机机头电除尘器提供改造方案选择。

In order to solidly promote the ultra-low emission transformation of the iron and steel industry and solve the problem that the conventional electrostatic precipitator at the head of the sinterstrand cannot meet the limit of the outlet dust concentration,the double-V current-sharing electrostatic precipitator technology is developed,while the layout of the electrostatic precipitator is simulated and optimized through CFD software,and the effect of uniform distribution of airflow is improved by adjusting the layout type of the double V-type flow-sharing dust collection plate and accurately adding a flow baffle at the flue.The numerical simulation results show that the uniformity coefficient(σ_(r) value) of the airflow distribution of the electrostatic precipitator is less than 0.15,the resistance is reduced from 235 Pa to 152 Pa,and the deviation of the flue gas flow of the inlet and outlet flue is within the range of ±5%.The arrangement for the double-V-type flow-sharing dust collection plate is retracted inward,which eliminates the local high-speed area in the middle position and the local low-speed area on both sides.The double-V flow-sharing electrostatic precipitator technology can provide a modification option for the electrostatic precipitator at the head of the sinterstrand.