摘要
本文基于额定蒸发量为10t/h锅炉的燃烧器进行研究,通过CFX19.0对天然气燃烧器不同运行工况进行数值仿真。主要采用标准k-ε模型、涡耗散模型耦合有限速率模型(FR/EDM)和P-1辐射模型模拟炉膛内部的详细情况。以不同过量空气系数为变量,分析不同过量空气系数下的温度分布、氧气消耗量和氮氧化物(NOX)生成量。结果表明,当过量空气系数分别为0.99,1.15和1.23时,炉膛中心最高温分别达到2030K,2100K和2070K,随着过量空气系数增加,燃烧温度先增加后减小,氮氧化物排放浓度同温度变化趋势。当过量空气系数取0.99时,氮氧化物排放量达到68.63 mg/m^(3),满足低氮燃烧。
This paper is based on the combustor of a boiler with a rated evaporation capacity of 10t/h.Numerical simulation of different operating conditions of natural gas burners with CFX19.0.Mainly adopted standard k-εmodel,Finite rate Chemistry and eddy dissipation model(FR/EDM)and P1 radiation model to simulate the internal details of the furnace.Take different excess air coefficients as variables,analyze the temperature distribution,oxygen consumption and nitrogen oxide(NOX)generation under different excess air coefficients.The results show that when the excess air coefficient isα=0.99,α=1.15 andα=1.23,the highest temperature of the furnace center reaches 2030K、2100K and 2070K,respectively.As the excess air coefficient increases,the combustion temperature first increases and then decreases,and the nitrogen oxide emission concentration changes with the temperature trend.When the excess air coefficient is 0.99,the nitrogen oxide emission reaches 68.63 mg/m^(3),which satisfies low-nitrogen combustion.
作者
敖庭禹
刘湘云
肖楠
陈观生
刘良德
AO Ting-yu;LIU Xiang-yun;XIAO Nan;CHEN Guan-sheng;LIU Liang-de(School of Materials and Energy,Guangdong University of Technology)
出处
《建筑热能通风空调》
2022年第8期82-85,90,共5页
Building Energy & Environment
基金
广州市科技计划项目(产业技术重大攻关计划(2019))(201902010021)。
关键词
天然气燃烧器
数值模拟
低氮
过量空气系数
氮氧化物
natural gas combustor
numerical simulation
low nitrogen
excess air coefficient
nitrogen oxide
