300MW燃煤锅炉掺烧生物质燃气的数值模拟  

Numerical Simulation on Co-firing Characteristics of Coal and Biomass Gas in a 300 MW Boiler

作　　者：李加护[1] 王小涛 高硕 张猛 LI Jiahu;WANG Xiaotao;GAO Shuo;ZHANG Meng(School of Energy,Power and Mechanical Engineering,North China Electrical Power University,Baoding 071003,Hebei Province,China;Research Institute of Thermal Power Technology,China Datang Corporation Science and Technology Research Institute,Beijing 100043,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]中国大唐集团科学技术研究院有限公司火力发电技术研究院,北京100043

出　　处：《动力工程学报》2020年第6期440-446,共7页Journal of Chinese Society of Power Engineering

摘　　要：为了探究掺烧生物质燃气对燃煤锅炉燃烧特性的影响,基于Fluent软件,选取某电厂亚临界300 MW锅炉作为研究对象,搭建生物质燃气与煤粉的混合燃烧模型,对纯燃煤工况和混燃工况开展数值模拟,其中混燃工况按锅炉总输入热量的20%计算生物质燃气量,通过改变生物质燃气的喷口位置分析炉膛内的速度场、温度场、烟气组分及污染物NO_x的变化规律。结果表明:与纯燃煤工况相比,掺烧生物质燃气后炉膛最高温度、出口烟温和NO体积分数降低;在不改变炉膛总体结构的情况下,生物质燃气喷口位置对炉膛温度分布和NO排放有较大影响。To study the co-firing characteristics of coal and biomass gas for coal-fired boilers,a co-combustion model was built for a 300 MW subcritical boiler to simulate the combustion process of pure pulverized coal and mixed fuel using Fluent software,and to find out the variation law of in-furnace velocity field,temperature field,gas component and NO_x distribution at different arrangements of biomass gas nozzles,during which,the quantity of biomass gas was calculated according to 20%of total heat input of the boiler under co-firing conditions.Results show that,compared with the condition of pure pulverized coal combustion,all the parameters,such as the maximum in-furnace temperature,the outlet gas temperature and the outlet NO concentration,are lower than that under co-firing conditions.The position of biomass gas nozzles has a great influence on the temperature distribution and NO emission when the overall structure of the furnace is not changed.

关 键 词：燃煤锅炉 掺烧 生物质燃气 烟气组分 污染物排放 数值模拟 

分 类 号：TK229.91[动力工程及工程热物理—动力机械及工程]