基于CFD流场分析的直角烟道优化研究
2021-02-11裴东旭
裴东旭

摘要:本文针对某火电厂燃煤锅炉机组的脱硫、超低排改造后,出现的烟道内部流动阻力过大,直角弯道导流板破损的情况,对空预器入口的烟道的导流板阻力特性进行研究。首先,通过理论分析烟道流动阻力的规律及烟道流动阻力的计算方法。针对目标烟道段进行优化设计,通过对比不同设计方案的导流板应力用变情况,得出一种较优的直角烟道优化方案,对同类型烟道系统的优化改造提供了一定的指导和借鉴。
关键词:CFD 流场分析 直角烟道 导流板
Research on Optimization of Right-Angle Flue Based on CFD Flow Field Analysis
PEI Dongxu
(Inner Mongolia Datang International Tuoketuo Power Generation Co. Ltd., Hohhot, Inner Mongolia, 010206 China)
Abstract: In view of the excessive flow resistance in the flue and the damage of the deflector in the right angle bend after the desulfurization and ultra-low emission transformation of a coal-fired boiler unit in a thermal power plant, the resistance characteristics of the deflector in the flue at the inlet of the air preheater are studied in this paper. First, analyze the law of flue flow resistance and the calculation method of flue flow resistance through theory. According to the optimized design of the target flue section, by comparing the resistance reduction effects of different design schemes, a better right-angle flue optimization scheme is obtained, which provides certain guidance and reference for the optimization and transformation of the same type of flue system.
Key Words: CFD; Flow field analysis; Right-angle flue;Deflector
我国前期投产的火力发电厂燃煤发电机组在初期设计的时候,未考虑锅炉烟道系统的结构降阻和导流板优化设计,在整个烟道系统中,存在很多直角弯头管段和T型管道管段,而且其内部的导流板布置较为简单,导致系统运行过程中烟道气流动阻力较大,对直角弯头和T形管道内部的导流板造成较大的扰动,长期运行容易导致导流板局部磨损过大,出现掉落失效,严重时可造成停炉风险[1] [2]。而近些年进行的燃煤锅炉机组超低排放改造,导致原有的管道系统变得更加复杂,虽然在直角弯头和异型管件中进行了一定的结构优化,但烟道系统的阻力仍然较大,存在很大的优化空间。
针对目前国内燃煤机组烟道系统局部阻力较大的现状,进行局部烟道内部导流板结构优化的需求是十分迫切的,这不仅可以提高电厂燃煤机组烟道系统的局部管件阻力状态,降低大修和停炉风险,也对国内同类型局部管件的优化提供了一个研究方向。……
