摘要
煤质的复杂性和下游工艺要求的多样性导致了多种煤气化技术的产生。在煤气化原理的基础上分析了当前国内煤气化技术的优劣,认为熔渣气流床具有气化速率快、碳转化率高和工艺过程绿色等优势,应成为煤气化技术的主要发展方向;移动床的热解层使得其产物气体中甲烷含量较高,有利于煤制天然气,但其床层特点使气化强度较低,且炉内存在碱金属富集的物理条件;流化床热解-气化也可以提高甲烷含量,且在合理选择原料煤粒度的条件下,气化强度高于移动床。其它煤气化技术还存在这样或那样的问题,需要继续研发或谨慎考虑工业化应用。
The complexity of coal constituent and the variety of downstream processes lead to varie- ty of coal gasification technologies. Domestic coal gasification technologies nowadays were analyzed in this paper based on the coal gasification principle. It is thought that the entrained slagging bed is the main development direction of coal gasification technology, which possesses the advantages of high gasi- fication reaction efficiency, high carbon conversion rate and is the best green process. The pyrolysis lay- er in moving bed leads to higher methane content in product gas and is good for coal to manufacture na- ture gas, but the problems of lower gasification intensity and alkali metals enrichment in the bed occur; Fluidized bed pyrolysis-gasification process can also raise methane content in its product gas. The gasifi- cation intensity is higher than that of moving bed if reasonable particulate size of feed coal is used. There are various problems for the other gasification technologies and need to continue to research and develop- ment or think carefully about industrial application.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2015年第4期22-28,共7页
Petroleum Processing and Petrochemicals
关键词
煤气化
化学反应
煤气化技术
coal gasification
chemical reaction
coal gasification technology
