助燃空气加湿对燃气锅炉低氮燃烧性能的影响
Influence of combustion air humidification on low nitrogen combustion performance of gas boiler
张群力 1周钊宇 2张金亮 2刘涛 2肖鑫2
作者信息
- 1. 北京建筑大学 供热供燃气通风及空调工程北京市重点实验室 北京 100044;北京建筑大学 北京节能减排与城乡可持续发展省部共建协同创新中心,北京 100044
- 2. 北京建筑大学 供热供燃气通风及空调工程北京市重点实验室 北京 100044
- 折叠
摘要
为降低燃气锅炉的NOx(氮氧化物)排放质量浓度,可以利用助燃空气加湿方法实现燃气锅炉降氮,重点针对该方式的燃烧过程和实施效果开展模拟与实验研究.研究不同助燃空气含湿量对燃气锅炉排烟温度、NOx排放质量浓度的影响规律.结果表明,助燃空气加湿可以明显降低炉膛出口的NOx平均排放质量浓度.当助燃空气加湿至76.90 g/kg时,燃气锅炉的NOx排放质量浓度可降低至38.05 mg/m3,降氮效率高达71.96％.当助燃空气含湿量高于57.30 g/kg时,炉膛出口的CO质量浓度增长率急剧增加,燃烧的稳定性变差,继续提高助燃空气中的水蒸气含量不利于燃气锅炉的稳定运行.提出的助燃空气加湿技术为已有燃气锅炉的低氮改造方面提供技术参考.
Abstract
To reduce the concentration of NOx emissions from gas boilers,the use of humidified air as combustion air was explored to achieve nitrogen reduction.This study focused on simulating and experimentally investigating this approach's combustion process and efficacy.Different levels of humidity in the combustion air were studied to assess their impact on flue gas temperature and NOx emission mass concentrations.The results show that humidified air can notably lower the average NOx emission mass concentration at the furnace exit.When the humidity in the secondary air is increased to 76.90 g/kg,NOx emission mass concentration from the gas boiler can be reduced to 38.05 mg/m3,achieving a high nitrogen reduction efficiency of 71.96％.However,when the humidity in the air exceeds 57.30 g/kg,the rate of increase in CO mass concentration at the furnace exit rises sharply,leading to decreased combustion stability.Continuously elevating the water vapor content in the humidified air is unfavorable for the stable operation of the gas boiler.The introduced humidified air approach provides valuable technical insight for the nitrogen reduction retrofit of existing gas boilers.
关键词
燃气锅炉/助燃空气加湿/降氮/数值模拟/燃烧特性Key words
gas boiler/combustion air humidification/NOx emissions reduction/numerical simulation/combustion characteristics引用本文复制引用
基金项目
北京建筑大学博士研究生科研能力提升项目(DG2023010)
北京建筑大学研究生创新项目(PG2022070)
出版年
2024
国家科技期刊平台
NSTL
万方数据