褐煤低温热解提质试验研究

针对蒙东地区褐煤水分含量高,发热量低,易风化自然,可磨性、成浆性差的问题,对其进行了管式炉低温热解提质试验研究。结果表明：试验优化的低温热解温度为480-520℃,此时半焦挥发分Vdaf为13.32%-16.43%,低位发热量为26.43-27.18 MJ/kg,半焦CO2反应活性大于98%,可磨性性指数大于60,成浆浓度大于60%;半焦着火点为326-342℃,氧化后着火点为305-327℃;原煤干基半焦产率为69.13%-70.46%,焦油产率为3.97%-4.60%。褐煤经过低温热解,发热量明显提高,着火点升高,反应性、可磨性及成浆性良好,并具有较高的电阻率。

Experiment Study on Low Temperature Pyrolysis Upgrading of Lignite

According to the high moisture content,low calorific value,easy weathering and spontaneous combustion,poor grindability and slurryability and other problems of the lignite from the east part of Inner Mongolia,the study on a tube furnace low temperature pyrolysis upgrading experiment was conducted with the lignite from the east part of Inner Mongolia.The results showed that the optimized low temperature pyrolysis temperature of the experiment was 480~520 ℃,the volatile matter Vdaf of the semi-coke was 13.32%~16.43%,the net calorific value was 26.43~27.18 MJ/kg,the CO2 reductivity of the semi-coke was over 98%,the grindability index was over 60 and the slurry mass fraction was over 60%.The ignition temperature of the semi-coke was 326~342 ℃ and the ignition temperature of the semi-coke oxidized was 305~327 ℃.The semi-coke yield of the raw coal dry basis was 69.13%~70.46% and the tar yield of the raw coal was 3.97%~4.60%.After the low temperature pyrolysis of the lignite,the calorific value was obviously improved,the ignition temperature was increased,the reaction,grindability and the slurryability were excellent and the resistivity was high.