7500t/d水泥窑尾SCR脱硝反应器数值模拟及导流优化设计
Numerical Simulation and Inflow Optimal Design of 7 500 t/d Cement Kiln Tail SCR Denitrification Reactor
蔺海艳 1雷本喜2
作者信息
- 1. 合肥城市学院 土木工程学院,安徽 合肥 238076
- 2. 合肥希普蓝达环境科技发展有限公司,安徽 合肥 230041
- 折叠
摘要
为解决山西某水泥厂7 500t/d水泥熟料生产线窑尾烟气SCR脱硝反应器催化剂磨损严重、脱硝效率低、氨逃逸大于3 mg/kg等问题,运用Gambit软件对脱硝反应器进行 1∶1 建模,通过Fluent软件对全尺寸SCR反应器烟道内的流场分布特性进行模拟,提出了在原基础上增加和调整均布板(引导烟气均流)、导流板(引导烟气扩散流动)的优化方案,优化后的方案通过工程验证,达到了工业性能指标.第一层催化剂上游速度分布相对标准偏差由 51.43%优化到 14.92%,第一层催化剂上游平均烟气入射角从20.17°优化到9.85°,对系统压损影响较小,从而降低了水泥窑尾烟气脱硝的成本,提高了烟气脱硝的效率.
Abstract
In order to address the issues of significant catalyst deterioration,inadequate denitrification effectiveness and ammonia leakage exceeding 3 mg/kg in the SCR denitrification reactor of the kiln end flue gas of a 7 500 t/d cement clinker production line in a cement plant in Shanxi,this paper employed the Gambit software to construct a 1∶1 scale model of the denitrification reactor.The Fluent software was used to simulate the characteristics of the flow field distribution in the flue of the full-size SCR reactor,and an optimal scheme was proposed,which involved adding and adjusting two plates-a homogeneous plate to guide uniform flow and a deflector plate to guide diffusion flow-to the original design.This optimized scheme was then verified through engineering tests and was found to meet the industrial performance indexes.The relative standard deviation of the velocity distribution upstream of the first layer catalyst was optimized from 51.43%to 14.92%,while the average flue gas incidence angle upstream optimized from 20.17° to 9.85°,which had a lesser effect on the pressure loss of the system,thereby reducing the cost of denitrification of the flue gas from the tail end of the cement kiln and enhancing the efficiency of the flue gas denitrification.
关键词
水泥窑/CFD数值模拟/导流板优化/脱硝反应器/催化技术Key words
cement kiln/CFD numerical simulation/deflector optimisation/denitrification reactor/catalytic technology引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据