煤质特性对快速热解中HCN释放的影响  

Influence of Coal Properties on the Release of HCNDuring Rapid Pyrolysis of Chinese Coals

作　　者：刘银河[1] 车得福[1] 徐通模[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《燃烧科学与技术》2004年第6期539-543,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目(G1999022210);教育部高等学校博士学科点专项科研基金资助项目(RFDP20020698048).

摘　　要：在管式半携带半固定床反应器中,在600～1000℃范围内对6种煤质各异的原煤进行了快速热解HCN释放的研究.结果表明,热解温度、煤的灰分和氢含量对HCN的释放具有很大的影响,而煤氮向HCN的转化并不依赖于煤的含氮量.随着热解温度的升高,煤氮向HCN的转化率显著提高.原煤中氢含量越高,煤氮向HCN的转化率越高,说明热解过程中煤的供氢能力是决定HCN释放的重要因素.原煤中灰分越多,则煤氮向HCN的转化率越低,说明煤灰能够抑制HCN的生成或者能够促进HCN的分解.对原煤添加NaCl、CaCO3和二茂铁Fe(C5H5)2的热解研究表明,Na和Ca对于HCN释放的影响不明显,而Fe则显著降低了HCN的释放.Six Chinese coals were pyrolyzed in a semi-entrained flow/semi-fixed bed reactor to investigate HCN release from coal nitrogen in temperature range from 600 to 1000°C. Experimental results show that HCN release is independent on nitrogen content in coal, while pyrolysis temperature, hydrogen content in coal and ash content in coal are three major factors influencing the HCN release from coal nitrogen. As pyrolysis temperature increases, the HCN conversion increases remarkably. The more the hydrogen content in coal, the more the HCN conversion is. It shows that coal donated H is an important factor for HCN to release. The more the ash in coal, the less the HCN conversion is due to the catalysis of ash to HCN decompose or restrain to HCN formation. Catalysts of NaCl, CaCO3 and Fe(C5H5)2 were also investigated to illustrate the ash composition influence on HCN formation. Results show that Fe can reduce HCN release, while Ca and Na have little impact on HCN formation.

关 键 词：HCN释放 NOx前驱物 煤质特性 快速热解 

分 类 号：X131.1[环境科学与工程—环境科学]