全预混水冷低氮沼气燃烧器的燃烧特性
Combustion characteristics of fully premixed water-cooled low-NOx biogas burner
张兴邦 1薛艳芳 2王云刚 1焦健 1刘羽飞 1张益嘉1
作者信息
- 1. 西安交通大学热流科学与工程教育部重点实验室,陕西西安 710049
- 2. 中国核电工程有限公司,北京 100840
- 折叠
摘要
沼气是由生物质发酵转化而来的燃气.目前,常见沼气燃烧器主要是扩散式和大气式燃烧器,普遍存在热强度较低、易吹熄等问题.本文基于全预混水冷燃烧技术发明了一种可更换燃烧头的全预混低氮水冷沼气燃烧器,探究沼气中CO2含量、过量空气系数、热负荷和水冷温度对燃烧器燃烧特性的影响,结果表明所设计的燃烧器对于甲烷浓度在55％～80％的沼气有良好的适应性.随着CO2含量的增加,燃烧温度降低,出口 NOx和CO含量降低,但是火焰长度增长;随着过量空气系数降低,燃烧热强度得到改善,但是烟气中NOx和CO含量增加;燃烧器热负荷对燃烧温度有较大影响,研究结果表明燃烧器在35％低负荷工况下仍可以稳定运行.
Abstract
Biogas is a kind of gas transformed by biomass fermentation.At present,the biogas burners are mainly diffused burners and atmospheric burners,which generally have low thermal strength and are easy to blow out.Based on fully premixed water-cooled combustion technology,a kind of water-cooled biogas burner was designed.Then,the effects of CO2 content,excess air coefficient,heat load and cooling water temperature in simulated biogas on combustion characteristics of burners were explored.The results showed that the designed burner had good adaptability for biogas with methane concentration from 55％-80％.As the CO2 content increased,the combustion temperature decreased,the NOx and CO content at the outlet decreased,but the flame length increased.As the excess air coefficient decreased,the combustion heat intensity improved,however,the NOx and CO content in the flue gas increased.The result showed that the heat load of burner had a great influence on the maximum combustion temperature.The burner could still operate stably under the minimum load of 35％.
关键词
水冷/全预混/低氮/燃烧特性Key words
water cooled/fully premixed/low NOx/combustion characteristics引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据