Ni/Olivine催化剂原位催化提质淖毛湖煤的热解研究

STUDY ON IN-SITU CATALYTIC PYROLYSIS OF NAOMAOHU COAL WITH Ni OLIVINE CATALYST FOR UPGRADING ITS PYROLYSIS OIL AND GAS

以橄榄石(Olivine)作为载体制备橄榄石负载Ni的催化剂(Ni/olivine),并对哈密淖毛湖煤进行催化热解焦油提质研究。利用固定床反应器进行热解试验,分析了热解温度、Ni负载量对焦油的产率及组成的影响,并利用模拟蒸馏评价焦油品质、GC-MS测定焦油具体成分变化,对提质机理进行了分析。试验结果表明:煤样在500℃下热解焦油产率达到最高的16.20%;加入Ni/olivine后,焦油产率明显降低,在Ni质量分数为5%时达到最低的14.36%,且焦油重质组分质量分数从35%降低至30%,轻质焦油产率提高了15.59%,同时气体产率明显下降,但H 2含量明显提高;焦油成分中的短链脂肪烃、苯类、酚类、萘类物质相对含量有所增加,说明Ni/olivine催化剂是通过对焦油中长链烷烃及多环化合物进行催化裂解来实现对焦油品质的提升,并且在Ni质量分数为5%时达到最佳提质效果。

The Ni olivine catalyst with olivine as a carrier was used to improve the tar quality of Hamin Naomaohu coal during catalytic pyrolysis.The effects of pyrolysis temperature and nickel loading on the yield and composition of tar were studied in a fixed-bed reactor.The tar quality was evaluated by simulated distillation,the specific composition of tar was determined by GC-MS,and the mechanism of quality improvement was analyzed.The results showed that the highest yield of tar was 16.20%at 500℃.After adding Ni olivine catalyst,when the Ni content was 5%,the tar yield decreased significantly and reached the lowest 14.36%,the mass fraction of heavy tar component decreased from 35%to 30%,and the light tar yield increased by 15.59%.The gas yield decreased significantly,but the H 2 content increased significantly.The relative content of short-chain aliphatic hydrocarbons,benzenes,phenols and naphthalenes in the tar components increased,which showed that Ni olivine catalyst could improved the quality of tar by catalytic cracking of long-chain alkanes and polycyclic compounds in tar,and the best quality improvement effect was achieved when the Ni mass fraction was 5%.