燃煤锅炉烟气深度净化用管式湿式电除尘器气流分布的组织与优化

发布时间：2018-05-29 11:13

  本文选题：管式湿式电除尘器 + 气流分布　； 参考：《西安建筑科技大学》2017年硕士论文

【摘要】：管式湿式电除尘器可看作由多个线管式电除尘器并联组成,若各电除尘器之间处理烟气流量偏差过大,将导致湿式电除尘器总的除尘效率下降。采用CFD数值模拟技术,对某热力公司116MW锅炉配套管式湿式电除尘器的内部气流分布进行研究分析,并对气流分布进行组织与优化。在电场进口断面气流速度分布满足相对均方根指标要求的基础上,将各单管处理烟气流量偏差控制在一定范围之内,以保障湿式电除尘器达到规定的排放要求。现场测试结果表明,出口粉尘浓度满足项目技术规范规定的排放要求,数值模拟结果可指导管式湿式电除尘器设计。本文以某热力公司116MW锅炉配套管式湿式电除尘器为研究对象,采用计算流体动力学(computational fluid dynamics,CFD)方法对除尘系统的内部气流分布进行了数值模拟试验。通过对原设计方案的流场分析,提出针对性的优化改进方案,最终实现如下的优化结果:(1)优化后各电场分区进口断面速度相对均方根最大为0.19,速度分布均匀,满足电场区气流分布均匀性?≤0.25的电除尘器技术规范要求。(2)烟气流量偏差超过±15%的单管只有2个(死角地方),优化后的结果可满足项目技术规范要求。(3)现场测试结果表明,管式湿式电除尘器出口烟气含尘浓度小于5 mg/m3,验证了数值模拟方法的可靠性,说明了数值模拟结果可指导管式湿式电除尘器设计。
[Abstract]:The tubular wet electrostatic precipitator can be regarded as a parallel composed of multiple line tubular electrostatic precipitators. If the deviation of flue gas flow among the electrostatic precipitators is too large, the total dust removal efficiency of the wet electrostatic precipitators will be reduced. CFD numerical simulation technology is used to study and analyze the internal airflow distribution of the pipe type wet electrostatic precipitator (ESP) of a 116MW boiler in a thermal company, and the airflow distribution is organized and optimized. On the basis of the airflow velocity distribution of the inlet section of the electric field meeting the requirements of the RMS index, the flue gas flow deviation of each single pipe is controlled within a certain range to ensure that the wet ESP can meet the prescribed discharge requirements. The field test results show that the export dust concentration can meet the emission requirements stipulated in the technical specification of the project, and the numerical simulation results can guide the design of the tubular wet electrostatic precipitator. In this paper, the pipe type wet electrostatic precipitator (WESP) of a 116MW boiler in a thermal company is taken as the research object, and the numerical simulation test of the internal airflow distribution of the dust collection system is carried out by using the computational fluid dynamics (CFD) method. Through the analysis of the flow field of the original design scheme, a targeted optimization and improvement scheme is put forward. Finally, the optimized results are as follows: 1) after the optimization, the maximum relative RMS velocity of the inlet section of each electric field zone is 0.19, and the velocity distribution is uniform. To meet the requirements of the technical specification for electrostatic precipitators 鈮，

本文编号：1950681