660MW机组燃煤锅炉耦合生物质气再燃数值模拟  

Numerical simulation on biomass gas re-burning in a 660 MW coal-fired boiler

作　　者：张小桃 段佛元 黄勇 王爱军 ZHANG Xiaotao;DUAN Foyuan;HUANG Yong;WANG Aijun(School of Electric Power,North China University of Water Resource and Electric Power,Zhengzhou 450003,China)

机构地区：[1]华北水利水电大学电力学院,河南郑州450003

出　　处：《热力发电》2020年第3期38-44,共7页Thermal Power Generation

基　　金：河南省教育厅自然科学研究计划项目(2011A140014);河南省科技发展计划项目(112102210281)。

摘　　要：为了研究不同高度生物质气再燃喷口对锅炉燃烧过程等的影响,基于Fluent软件,搭建燃煤耦合生物质气模型,对某公司660 MW机组煤粉炉耦合生物质气再燃过程进行了数值模拟,研究生物质气喷口位置对锅炉温度场、NOx的排放量和烟气中各组分变化的影响。结果表明:燃煤锅炉耦合生物质气再燃会导致炉膛烟气出口温度升高,并且随着生物质气喷口高度的增加而增加;生物质气再燃能降低NOx的排放量,生物质气喷口位于再燃区上部、中部、下部时NOx排放的平均质量浓度分别为228.32、210.19、239.58 mg/m^3,其中生物质气喷口位于再燃区中部的效果最好,与原始工况NOx排放平均质量浓度291.96 mg/m^3相比,下降了28.01%;生物质气再燃增加了烟气中CO的体积分数,并且随着生物质气喷口位置的增高而增加。In order to investigate the effects of re-burning nozzles of biomass gas at different heights on the combustion process of boiler,numerical simulation was carried out for re-burning process of a 660 MW coal-fired coupled biomass gas boiler,on the basis of establishing a model for the boiler using Fluent software.The effects of nozzle location of biomass gas on boiler temperature field,NOx emissions and flue gas components were studied.The results show that,the biomass gas re-burning in coal-fired boiler will result in higher temperature at the furnace outlet,and the outlet temperature increases with the biomass gas nozzle height.The biomass gas re-burning can reduce the NOx emissions,when the biomass gas nozzle is located in the upper,middle and lower parts of the reburning zone,the average mass concentration of NOx emission is 228.32,210.19 mg/m^3,239.58 mg/m^3,respectively.When the biomass gas nozzle locates in the middle of the re-burning zone,it has the best NOx reduction effect,which is 28.01%lower than the average mass concentration of NOx emission(291.96 mg/m^3)under the original working condition.However,the biomass gas re-reburning increases the CO volume fraction,and the CO volume fraction increases with the biomass gas nozzle location height.

关 键 词：燃煤锅炉 生物质气 耦合发电 再燃 喷口高度 NOX排放 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]