化工学报2025，Vol.76Issue(3)：1243-1252,10.DOI:10.11949/0438-1157.20240879
空气系数对煤粉预热解燃烧特性的影响分析
Investigation of the effect of air coefficient on the combustion characteristics of pulverized coal pre-pyrolysis
摘要
Abstract
Pulverized coal pre-pyrolysis combustion method is an effective way to reduce NOx and stabilize combustion.To investigate the pre-pyrolysis combustion characteristics of pulverized coal,the RPM-MSRM model(random pore model-multiphase surface reaction model)for pulverized coal pre-pyrolysis combustion was established,and the effects of air coefficient on generation of pyrolysis gases and conversion of fuel nitrogen were investigated.The results show that after pulverized coal pre-pyrolysis,the volatile matter is pyrolyzed and part of the coke is gasified to generate a large amount of pyrolysis gas[23%—38%(vol)]and high-temperature coke(>800℃),and the flue gas jet rigidity is enhanced,which helps to improve the combustion stability.The rigidity of the flue gas jet is enhanced,which helps to improve the combustion stability.The air coefficient is the main factor affecting the characteristics of pulverized coal pre-pyrolysis.The air coefficient is positively correlated with outlet temperature and negatively correlated with pyrolysis gas concentration.The optimum pre-pyrolysis air coefficient for the device in this paper is 0.3.The lowest NOx concentration at the unit outlet is 26.82 mg/m3(@6%O2,standard operating conditions),and the highest reduction efficiency of fuel nitrogen is 99.51%.Therefore,pulverized coal pre-pyrolysis combustion should be maintained at the optimum air coefficient conditions to achieve the best nitrogen reduction.关键词
煤燃烧/热解/计算流体力学/燃料氮/焦炭模型Key words
coal combustion/pyrolysis/computational fluid dynamics/fuel nitrogen/char model分类
能源科技引用本文复制引用
姚国家,王志,苏昂,冯东阁,唐宏,孙灵芳..空气系数对煤粉预热解燃烧特性的影响分析[J].化工学报,2025,76(3):1243-1252,10.基金项目
国家自然科学基金项目(52376096) （52376096）
