【作者】 何骏； 丛海亮； 董健； 彭淑婧； 霍昱； 陈磊；

【Author】 He Jun;Cong Hailiang;Dong Jian;Peng Shujing;Huo Yu;Chen Lei;Beijing Capital Environmental Technology Co.,Ltd;KATR Science and Technology Development Co.,Ltd;State key Laboratory of Tribology Tsinghua University;

【机构】 北京首创环境科技有限公司； 中能国信(北京)科技发展有限公司； 清华大学摩擦学国家重点实验室；

【摘要】 由于生物质燃烧产生的烟气污染物成分复杂,其SCR装置须布置于烟气脱硫及除尘系统设备之后,为低温SCR工艺,相对于常规的中高温SCR工艺,其烟道及设备布置复杂。而SCR装置内部的烟气分布状态与SCR装置的脱硝效果息息相关。生物质燃烧烟气SCR的案例较少,为了分析烟道内装置及系统布置方式对烟气及还原剂分布的影响,提高SCR系统的可靠性,以杞县生物质热电联产项目的低温SCR装置为例,采用计算流体数值模拟的方式,对SCR系统初始设计方案的流场进行了全面分析,并发现了初始设计方案的缺陷。根据分析结果提出了优化设计方案,即在合理位置增设一定数量的导流板。再次进行流场分析后发现,烟气及还原剂分布情况大为改善,系统阻力有所下降,各项指标满足相关规范的要求,低温SCR系统的可靠性大为增强。可为同类型项目的设计提供参考。更多还原

【Abstract】 SCR device generally is arranged after the desulfurization and dust removal equipment in air pollution control system due to the complex composition of flue gas pollutants from biomass combustion.The arrangement of flue and devices in low temperature process is more complicated than that of medium and high temperature SCR process.The flue gas distribution in SCR system was closely related to the denitrification effect on its own system.Few SCR process cases could be found in biomass combustion plant.The influence of devices in flue and their arrangements on distribution of gas and reductants should be helpful to improve the reliability of SCR system.Base on the under construction of a biomass cogeneration project in Qixian Count, computational fluid numerical simulation was used to comprehensively analyze the flow field of the initial design to find its defects.Modified solution of design was obtained that several guide plates should be fixed in reasonable positions.Secondary simulation under modified solution showed that the distribution condition of gas and reductant was greatly improved, the resistance of the system reduced.Meanwhile, the values satisfied the requirements of specifications.In general, the reliability of the low temperature SCR system was greatly enhanced.This study results can provide beneficial guide for the similar project in future.更多还原