煤中无机成分制备储热相变材料

PREPARATION OF PHASE CHANGE MATERIALS FROM INORGANIC CONSTITUENTS IN COAL

针对目前高温储能相变材料较少和煤中无机成分处理困难的现状,通过对煤中无机成分热解、碱熔、酸溶、沉淀和萃取等步骤,以H2SO4,HCl和NaOH为主要反应试剂,改变反应体系的温度、酸的浓度、碱与原料的配比,制备出一系列可溶性和不溶性的样品.通过对样品进行组分分析、差热-热重分析和XRD方法的表征,确定出样品的组成、结晶水的含量、某种组分的分解温度和含量以及熔点、结晶程度和晶型.在上述表征与分析基础上,发现碱熔法制备的材料在50℃～150℃范围内能够吸热较多且晶型较好,可作为换热器的相变材料.

Aiming at the high temperature phase change materials is less and the current situation of inorganic constituent in coal gangue processing difficulties, through changing the re- action temperature, acid concentration, alkali and the ratio of raw materials, and using HCl, H2SO4 and NaOH as the main reactant, series of soluble and insoluble samples have been pre- pared in this paper. Elemental composition of the sample has been qualitatively and quantitatively analyzed, to determine the composition. And to determine phase-transition temperature and crys- tal case of the samples, DTA-TGA and XRD analysis for samples have been carried out. By pro- cessing and analyzing data, it was found that the materials prepared by alkali fusion using sodium hydroxide would absorb more heats within the scope of 50 ℃-150 ℃, and crystal form good, would be use as phase change materials filled heat exchanger.