改性粉煤灰相变储能材料在余热回收中的应用  

Modification of fly ash as a carrier of paraffin wax based phase change energy storage material for waste heat recovery

作　　者：赵亮[1] 王海洋[1] 方向晨[1] 王刚[1] 徐宏[1,2] 

机构地区：[1]中国石油化工股份有限公司抚顺石油化工研究院,辽宁抚顺113001 [2]华东理工大学机械与动力工程学院,上海200237

出　　处：《储能科学与技术》2013年第6期598-602,共5页Energy Storage Science and Technology

基　　金：国家火炬计划项目(2011GH560340);中国石油化工股份有限公司项目(2012HB1101)

摘　　要：以石蜡为相变材料、改性粉煤灰为载体、无水乙醇为溶剂,采用溶液插层法合成了石蜡/改性粉煤灰相变储能材料。经过柠檬酸改性后的粉煤灰,骨架结构保持完整,不仅去除了其中杂质,而且对相变材料吸附能力有所改善。差示扫描量热(DSC)结果表明,PCM-3储能材料的熔化潜热值和熔化温度分别为327.85 kJ/kg和53.63℃;红外(FT-IR)测试表明,储能材料化学稳定性良好,由于吸附后的石蜡与粉煤灰载体间具有很强的表面张力,可以有效防止熔化后石蜡从载体中流失。借助相变蓄热式换热器测试了储能材料在工业余热回收中的应用效果,发现换热器出口水流温度在一定时间内可以近似保持恒定温度。The work reported in this paper concerns preparation of paraffin wax based composite phase change materials （PCMs） for waste heat recovery. Surface modified fly ash was used as the PCM carrier and water-free ethanol as the solvent and the solution intercalation was used to prepare the composite materials. The fly ash modification was done by using citric acid, which did not affect the structure of the fly ash. The modification process was found to be able to remove impurities of fly ash and improve the adsorption capacity of PCMs. A series of experiments were conducted to characterize the prepared composite materials using DSC, FT-IR and SEM. The DSC results showed that the best composite material had a melting latent heat of 84.23 kJ/kg with the melting temperature of 53.63 ~C. The FT-IR analyses showed good chemical stability of composites, and the leakage of melted paraffin from the composites could be prevented through the capillary force and surface tension between paraffin and fly ash. By using a heat exchanger, the PCMs were tested for the recovery of industrial waste heat. It was shown that the outlet water temperature of the heat exchanger could be maintained approximately constant for a few hours.

关 键 词：相变储能材料 粉煤灰 石蜡 余热回收 换热器 

分 类 号：TK531.5[动力工程及工程热物理—热能工程]