宝日希勒褐煤的热压提质试验研究

介绍了气流干燥技术的优点,并利用HPU试验线对宝日希勒褐煤进行了热压提质研究。煤样热重分析表明宝日希勒褐煤适宜的干燥温度为105～371℃。通过分析干燥温度、给料频率对提质煤粉水分的影响及提质煤粉水分对型煤质量的影响,说明提质煤粉水分随干燥温度的升高而降低,随给料频率的增加而增大,宝日希勒褐煤适宜的干燥温度为220～320℃,给料频率为30～50 Hz;提质煤粉较适宜的水分范围为5%～13%,最佳水分为5%～8%,此时,型煤抗压强度可达900 N/个以上,落下强度超过80%。因此,以高温烟气为干燥介质,采用气流干燥技术对宝日希勒褐煤进行脱水干燥提质是可行的。试验结果为拓展宝日希勒褐煤的加工利用途径提供了依据,也为其他地区的褐煤提质提供参考。 Introduce the advantages of pneumatic drying techniques,carry out the hot press upgrading experiments of Baorixile lignite with hot press upgrading(HPU) testing line.The coal sample thermal analysis indicates that the proper drying temperature for Baorixile lignite is between 105 ℃and 371 ℃.The influence of drying temperature,feeding frequency on moisture of upgrading coal fines which directly affects the quality of briquette show that the moisture of upgrading coal fines decreases with the increase of drying temperature,increases with the increase of feeding frequency.The proper drying temperature for Baorixile lignite is between 220 ℃ and 320 ℃,feed frequency is between 30 Hz and 50 Hz.The suitable moisture for upgrading coal ranges from 5 percent to 13 percent,the optimum moisture for upgrading coal fines ranges from 5 percent to 8 percent.When all the variables are in the appropriate ranges,unconfined compressive strength is up to 900 Newton per one,falling strength is over 80 percent.Therefore,it is feasible that dewatering and drying Baorixile lignite using the pneumatic drying technique as the flue gas drying medium.The results provide the basis for expanding the processing and utilization pathway of the Baorixile lignite,serving as a reference for other regions