CaCl_(2)/石墨烯复配对活性炭-甲醇工质对吸附解吸特性的影响  

Effects of CaCl_(2) Impregnation and Graphene Blending on Adsorption Refrigeration with Activated Carbon-Methanol Working Pair

作　　者：公绪金[1] 王君竹 董玉奇 Gong Xujin;Wang Junzhu;Dong Yuqi(School of Energy and Civil Engineering,Harbin University of Commerce,Harbin,150028,China)

机构地区：[1]哈尔滨商业大学能源与建筑工程学院,哈尔滨150082

出　　处：《制冷学报》2023年第1期104-113,共10页Journal of Refrigeration

基　　金：国家自然科学基金(51708162)资助项目;2020年度黑龙江省省属高等学校基本科研业务费科研项目(哈尔滨商业大学青年学术骨干支持计划)(2020CX06)资助。

摘　　要：为同步增强活性炭-甲醇吸附制冷系统的热质传递能效,本文在压块活性炭制备工艺中引入炭素前驱体原位CaCl_(2)浸渍嵌合与石墨烯复配过程,制备了中、微孔同步发达的新型炭材料CA-GC及石墨烯复配炭SC-GC;并对其吸附/解吸特性、导热系数及制冷特性进行对比研究。结果表明:CaCl_(2)浸渍嵌合显著提升了炭表面及炭骨架内部的钙氧化物吸附点位丰度(灰分达到19.38%),从而显著提升了CA-GC的Sokoda&Suzuki平衡吸附量((533.38±6.97)mg/g)和导热系数((1.058±0.77)W/(m·K))。石墨烯的复配过程进一步强化了复合炭材料SC-GC的导热系数((2.61±0.15)W/(m·K))和平衡吸附量((712.84±30.66)mg/g)。当解吸温度为100℃,循环时间60 min时,基于SC-GC构建的吸附制冷床连续制冷循环脱附量、制冷量和制冷功率分别达到(533.10±14.17)mg/g、(486.95±9.79)kJ/kg和(973.86±15.28)kJ/(kg·h)。In-situ CaCl_(2)impregnation/chimerization of carbon precursors and graphene blending were introduced into the preparation process of agglomerated activated carbon to simultaneously enhance the heat and mass transfer efficiency of the activated carbon-methanol adsorption refrigeration system.Two types of innovative carbons—CA-GC and SC-GC—were prepared in this study,with synchronously developed meso-pores and micro-pores.This study includes a comparative study of the adsorption/desorption characteristics,thermal conductivity,and refrigeration characteristics of the new carbon-methanol working pair.In-situ CaCl_(2)impregnation/chimerization resulted in significant improvement in terms of the abundance of calcium oxide adsorption sites on the carbon surface and inside the carbon framework(ash content reached 19.38%).The Sokoda&Suzuki equilibrium adsorption capacity((533.38±6.97)mg/g)and thermal conductivity((1.058±0.77)W/(m·K))of CA-GC were significantly improved.The blending process of graphene further enhanced the thermal conductivity((2.61±0.15)W/(m·K))and equilibrium adsorption capacity((712.84±30.66)mg/g)of the composite carbon material SC-GC.When the desorption temperature was 100℃and the cycle time was 60 min,the desorption capacity,refrigeration capacity,and refrigeration power of the continuous refrigeration cycle of the adsorption refrigeration bed constructed by SC-GC reached(533.10±14.17)mg/g,(486.95±9.79)kJ/kg,and(973.86±15.28)kJ/(kg·h),respectively.

关 键 词：吸附制冷 活性炭 甲醇 导热系数 制冷功率 

分 类 号：TB611[一般工业技术—制冷工程] TB64[化学工程] TQ424