Research progress and industrialization prospect of high concentration lignite water slurry prepared by hydrothermal treatment
LI Chunqi
Abstract：Lignite's characteristics of high inner moisture content and high oxygen functional groups content made it very difficult to achieve high concentration coal water slurry,which couldn't satisfy the requirement of coal water slurry gasification.By analyzing its technological principles,hydrothermal treatment was considered as the most promising technology to increase the concentration of lignite water slurry (LWS).Meanwhile,LWS research development and technology progresses at home and abroad were introduced.Taking a typical LWS technology THTT as an example,its industrialization prospect was analyzed from the technological and economical perspectives.The analysis results showed that the hydrothermal treatment technology had the characteristics of safety environmental protection,high efficiency and reliability.In terms of economy,it had advantages of low investment cost and high profit.Taking a 5 × 105 t/a chemical fertilizer plant in Inner Mongolia which adopted THTT as research object,the addition of hydrothermal treatment increased coal water slurry concentration from 50％ to 58％,urea yield by 7 × 104 t/a,profit by RMB 8.3 × 107.The hydrothermal treatment was feasible in economic and technical,it was also consist with the policy orientation of increasing efficiency and decreasing consumption.
Keywords：lignitehydrothermal treatmenthigh concentration coal water slurryindustrialization prospect
Publication Date：2017-01-01