Research status of lignite forming technologies

There are abundant lignite resources in China,while its utilization is limited by the coal quality,that means it needs to be upgraded.The lignite upgrading technologies at home and abroad include pyrolysis upgrading process,dehydration upgrading process,forming upgrading process and so on.Based on the requirements of users,the lignite forming technologies change some nature of raw coal through special processes,the production is admirable.Once spontaneous combustion and high water content restricted the long-distance transport and storage of lignite,now this technology solves these problems.So this technology has obvious economic and environmental benefits.Summarize lignite forming technologies of many upgrading processes at home and abroad,introduce and compare the main features of representative technologies.Forecast the development trend of lignite forming technologies in China.