摘要
以凤凰山无烟煤(FHS)和寺河无烟煤(SH)作为航天炉的气化原料煤,考察了其燃烧特性、气化反应性及煤灰流动性,并与神木烟煤(SM)进行了对比研究。结果表明:无烟煤的着火温度比典型烟煤的着火温度高150℃~250℃,且燃烧性能较差,一方面气化炉开工阶段需对开工燃烧器的物料参数进行优化以确保顺利点火,另一方面需对主燃烧器进行优化设计从而提高粉煤与气化剂的混合程度,保证充分燃烧和火焰稳定。此外,由于无烟煤煤化程度高,气化反应活性低,为确保高碳转化率,需要较高的气化操作温度并延长煤粉在气化炉内的停留时间。无烟煤灰熔点高且黏温特性为典型的结晶渣,直接气化会导致操作难度和消耗增加。通过添加质量分数为4%的石灰石对煤灰流动性进行调控,可保证无烟煤的稳定高效气化。
The combustion characteristics,gasification reactivity and coal ash fluidity of Jincheng anthracite which was used as the feedstock for the HT-L Gasifier were investigated and compared with Shenmu bituminous.The results show that the ignition temperature of Jincheng anthracite is 150℃-250℃higher than that of Shenmu bituminous,and the combustion performance of Jincheng anthracite is relatively poor.Therefore,the parameters of the material in the start-up burner need to be optimized to ensure a smooth ignition at the start-up stage of the gasifier.Besides,the design of the main burner needs to be optimized to improve the mixing of pulverized coal and gasification agent for maintaining full combustion and flame stability.In order to ensure a high carbon conversion rate of anthracite with the relatively low gasification reactivity,a higher operation temperature and longer residence time of the pulverized coal are required.Furthermore,considering the high ash fusion temperatures(AFTs)and typical crystalline slag viscosity-temperature characteristic of anthracite,direct gasification will increase the consumption and difficulties in the operation.The fluidity of the coal ash can be adjusted by adding 4%limestone to ensure the stable and efficient gasification of anthracite.
作者
孙强
麻栋
陈晓东
张文斌
周泉
郭进军
丁建平
姜从斌
SUN Qiang;MA Dong;CHEN Xiaodong;ZHANG Wenbin;ZHOU Quan;GUO Jinjun;DING Jianping;JIANG Congbin(Changzheng Engineering Company Limited, 101111 Beijing, China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2021年第1期51-58,共8页
Coal Conversion
基金
国家重点研发计划重点专项项目(2017FYB0602700).
关键词
无烟煤
燃烧特性
气化反应性
煤灰流动性
航天炉
anthracite
combustion characteristics
gasification reactivity
coal ash fluidity
HT-L gasifier
