摘要
褐煤含水量高,直接燃烧发电效率低。褐煤干燥脱水技术能有效降低褐煤含水量,提高其竞争力。研究介绍了烟气干燥技术、蒸汽干燥(管式干燥,流化床蒸汽干燥)、水热脱水技术、机械热力脱水技术(MTE)和热油干燥技术(UBC)5种褐煤干燥脱水技术的原理;对比分析了不同干燥脱水技术的压力、温度、脱除状态、脱水效率、孔隙结构和重吸收特性;机械热力脱水技术(MTE)可以改变褐煤孔隙结构、防止重吸收、脱水效率较高和能耗低。结合我国褐煤分布特点,开发新型干燥脱水技术,在源头降低煤的水分含量,实现煤的经济运输,提高电厂的发电效率。
With a high water content,lignite has a low efficiency for direct combustion power generation.The lignite drying and dewatering technology can effectively lower the water content of lignite and enhance its competitive power.On this basis,the authors studied and analyzed the principles of the following technologies,namely,flue gas drying technology,steam drying technology(tube type drying and fluidized bed steam drying),hydrothermal dewatering technology,mechanical thermal dehydration(MTE) technology and upgraded brown coal(UBC) technology.Moreover,they also contrasted and analyzed the pressure,temperature,removing state,dewatering effectiveness,pore structure and re-absorption characteristics of various drying and dewatering technologies.The mechanical thermal dehydration technology can change the pore structure of brown coal and prevent from re-absorption,thus achieving a relatively high dewatering efficiency with a low energy consumption rate.It is of major significance for China to develop novel drying and dewatering technologies with due consideration of the brown coal distribution features of China to lower the water content of coal from its source,realize an economic transportation of coal and enhance the power generation efficiency of power plants.
出处
《热能动力工程》
CAS
CSCD
北大核心
2013年第2期115-120,213,共6页
Journal of Engineering for Thermal Energy and Power
关键词
褐煤
干燥
脱水
机械热脱水(MTE)
流化床干燥技术
lignite,drying,dewatering,mechanical thermal dehydration(MTE),fluidized bed drying technology
