电站锅炉脱硝系统催化剂磨损数值模拟  

Study and Governance of SCR Catalyst Attrition Based on the Numerical Simulation and Testing

作　　者：安敬学[1] 王磊[1] 秦淇[1] 蓝晓村[1] 程金武[1] 

机构地区：[1]中国大唐集团科学技术研究院有限公司华中分公司,河南郑州450000

出　　处：《锅炉技术》2016年第2期32-38,42,共8页Boiler Technology

摘　　要：国内某660 MW超超临界直流锅炉脱硝系统SCR催化剂出现严重磨损导致脱硝装置失效,统计得知磨损区域集中于催化剂的近锅炉侧。利用数值模拟,分析了磨损形成的机理,数值模拟计算的磨损位置与实际吻合,催化剂磨损的主要原因是由飞灰颗粒场的不均匀分布所导致,提出了6种改造方案并加以计算。通过对比分析,选择一最佳改造方案,通过加装导流撞击装置,使催化剂上部的飞灰颗粒向催化剂的远锅炉侧移动,从而改善SCR烟道内流场及飞灰颗粒场的不均匀性。数值模拟结果证明最佳改造方案能有效解决SCR催化剂磨损问题,显著提高脱硝系统运行的可靠性,且具有施工简单、经济可靠的特点。The selective catalytic reduction （SCR） system catalyst attrition of a domestic ultra-supercritical once-through boiler lead to SCR device failure, statistics showed the attrition area focused on near side of the boiler. This paper based on the numerical simulation, analyzed the formation mechanism of the catalyst attrition, attrition position calculated by numerical simulation coincide with the actual, the main reason about catalyst attrition caused by nonuniformity distribution of the fly ash particle field, put forward six kinds of reconstruction scheme and also computed. Through comparative analysis, choose the best, Through added the guiding percussion device, made attempts the fly ash particles on top of catalyst to move towards far side of the boiler, to improve the SCR inhomogeneity of flow field and fly ash particle field. The results of numerical simulation showed that the governance scheme could effectively solve the problem of catalyst attrition and significantly improve the reliability of the SCR system, as well as this scheme was simple, economic and reliable in construction.

关 键 词：脱硝系统(SCR) 数值模拟 颗粒场 催化剂磨损 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]