%0 Journal Article
%T 褐煤低温干燥特性的实验研究 -
%A 孙宝林
%A 尤菠
%A 苏怀兴
%A 赵欢
%A 韩艳娜
%J 洁净煤技术
%D 2013
%X 中国褐煤储量丰富,但较高水分极大地限制了其开采和利用,对其进行脱水提质是解决褐煤高效利用的关键。通过热重分析仪(TGA)对HL和YN的不同粒径褐煤,分别在50,80和110℃等温干燥2 h。结果表明:在每个干燥温度下煤样都能达到恒重,随着温度的升高煤样总失重增加,说明煤中水分与煤表面之间具有不同的结合强度;随着水分的降低,水分蒸发所需能量增加,煤水之间的相互作用加强,其中包括氢键和微孔对水的束缚力。粒径0.250～0.150 mm、水分26.61%的HL褐煤在50℃干燥后,水分降至6.96%,此时水分以分子层水的形式存在;干燥温度升至110℃时,煤中水分并未明显降低,说明煤中官能团与水分子间形成的氢键对水分有强烈的吸附作用。HL褐煤50℃干燥后,0.150～0.074 mm和0.074～0.038 mm煤样残留水分分别为6.52%和3.93%,均低于0.250～0.150 mm煤样的6.96%,说明0.250～0.150 mm煤样中不能脱除的残留水是孔隙水,被禁锢在狭小空间内。 Lignite reserves are abundant in China,but the high water content greatly limits its exploitation and utilization.The key to solve the efficient use of lignite is dehydration upgrading.The weight loss of HL and YN lignite with different particle size are determined at 50,80 and 110 益 for 2 hours by thermal gravimetric analysis(TGA).The results show that the weight loss of coal samples almost doesn't further increase after a period of dehydrate at each drying temperature,and the total weight loss increase with the drying temperature increase,indicating that the bonding strength between the coal surface and the water is different.The energy consumption for evaporation of water and the interaction including the hydrogen bonds and the binding force of microspores with water in coal increase with the water content decrease.The HL lignite,whose particle size ranging from 0郾 250 mm to 0郾 150 mm,moisture 26郾 61 percent,is dried at 50 益 and the moisture decrease to 6郾 96 percent in the form of the molecular layer water.When the drying temperature further increase to 110 益,the moisture doesn't significantly decrease,which indicate that the hydrogen bond between functional groups and water molecule has strong adsorption for water.After dried at 50 益,the residual moisture of 0郾 150 mm to 0郾 074 mm,0郾 074 mm to 0郾 038 mm and 0郾 250 mm to 0郾 150 mm HL lignite is 6郾 52 percent,3郾 93 percent and 6郾 96 percent respectively.The results show that,the residual water in 0郾 250 mm to 0郾 150 mm lignite is pore water,which is trapped in a small space
%K 褐煤
%K 低温干燥
%K 水分
%K 热重
%K 氢键
%K 孔结构 lignite
%K low-temperature drying
%K moisture
%K thermogravimetry
%K hydrogen bond
%K pore structure
%U http://www.jjmjs.com.cn/WKD/WebPublication/paperDigest.aspx?paperID=229ca57d-1642-458d-84c5-fb3b9caa136d