Upgrading of lignite by fluidized bed
ZHAO Zhenxin
WANG Yongsheng
ZHU Shuquan
Abstract：The lignite has the disadvantages of high moisture,low calorific value and easy spontaneous combustion.The essay took lignite in Inner Mongolia as object,carried out the lignite static drying test and upgrading multi-factor test.Taking the flue gas in which the O2 vol-ume fraction was 10.5% as drying medium,the serial experiments of fluidized bed upgrading based on the analysis of fluidized bed upgra-ding principle were conducted.The results showed that,the optimum moisture was around 5%.When the lignite size was below 3 mm,the temperature affected the drying rate most,followed by lignite size and air speed.The paper determined the critical fluidized air speed for to-tal size fraction,0.5 to 1.25 mm,1.25 to 2 mm,2 to 3 mm was 38,20,40,50 m3 / h respectively.The optimum upgrading temperature and time was 200 to 240 ℃ and 5 to 8 minutes.At last,an upgrading model was built which had a guidance function to lignite upgrading.
Keywords：ligniteupgradingfluidized bedcritical fluidized air speeddrying speed
Publication Date：2014-01-01
Pages：5( 23-27 )