燃煤脱硝装置大颗粒灰拦截网多尺度计算方法
岳朴杰¹，雷彧²，陈晟²，刘小伟²，孟磊¹，谷小兵¹
（1. 大唐环境产业集团股份有限公司，北京 100097；2. 煤燃烧国家重点实验室（华中科技大学），湖北 武汉 430074）
摘要： 在SCR 脱硝装置烟道中加装拦截网对烟气中毫米以上的大颗粒灰进行拦截，可有效防止脱硝装置中的催化剂
堵塞问题。提出一种基于多尺度计算流体力学的设计方法，对拦截网微观流场及压力场进行模拟，获取不同结构拦截网
压降公式，并耦合至烟道尺度宏观流场及颗粒轨迹计算中，获得不同烟气流速、安装角度和颗粒尺寸下拦截网压降及拦
截效率变化规律。模拟方法及结果可为SCR 脱硝装置大颗粒灰拦截技术工程应用提供设计依据。
关键词： 选择性催化还原；大颗粒灰；拦截网；CFD 数值模拟；多尺度计算
中图分类号： X701     文献标志码： A     文章编号： 2095-0802-(2022)07-0001-05
Multi-scale Calculation Method for Large Particle Ash Interceptor for Coal-fired
Denitrification System
YUE Pujie¹, LEI Yu², CHEN Sheng², LIU Xiaowei², MENG Lei¹, GU Xiaobing¹
(1. Datang Environment Industry Group Co., Ltd., Beijing 100097, China; 2. State Key Laboratory of Coal Combustion
(Huazhong University of Science and Technology), Wuhan 430074, Hubei, China)
Abstract: Adding particle interceptor into the SCR denitrification system can effectively prevent the fouling and abrasion of the
catalyst caused by the large particles ash (LPA) in the flue gas. This paper proposed a design method based on multi-scale
computational fluid dynamics. In this method, the local flow and pressure fields around the interceptor was simulated, formulas for
the pressure drop of the interceptors with different structures were obtained and coupled with the calculation of the macroscopic
flow field and particle trajectory of the flue, and the effect of the flow velocity, the installation angle and the particle size on the
pressure drop and the interception efficiency was obtained. The simulation methods and the results can provide a design basis for
the engineering application of large particle ash interception technology for SCR denitrification system.

Key words: selective catalytic reduction; large particle ash; interceptor; CFD numerical simulation; multi-scale calculation