硝酸盐/膨胀石墨储热材料的制备及热性能研究  

Preparation and Thermal Performance of Nitrate/Expanded Graphite Thermal Storage Materials

作　　者：李良海 刘超 吴东润 肖泽旭 李红娟 朱紫龙 LI Liang-hai;LIU Chao;WU Dong-run;XIAO Ze-xu;LI Hong-juan;ZHU Zi-long(Qingdao Degute Energy Saving Equipment Co.,Ltd.,Qingdao 266300,China)

机构地区：[1]青岛德固特节能装备股份有限公司,青岛266300

出　　处：《应用能源技术》2022年第12期47-51,共5页Applied Energy Technology

摘　　要：为了得到膨胀石墨(EG)含量对NaNO 3-KNO 3/EG复合储热材料导热系数的影响,通过水溶液法,采用NaNO 3-KNO 3共晶盐作为储热材料,不同质量分数的EG作为基体材料,制备出NaNO 3-KNO 3/EG复合储热材料。分别用同步热分析仪(STA)和激光闪射仪(LFA)测量了材料的潜热和导热系数。结果表明,NaNO 3-KNO 3/EG复合材料的潜热随EG含量的增加而减小,导热系数相较于纯硝酸盐均有明显提升。添加20%的EG时,复合材料的平均导热系数可以达到3.95 W/(m·K),约为纯硝酸盐的7.4倍。将EG加入到二元硝酸盐中制备成复合储热材料是提高其传热性能的一种有前景的候选材料。In order to obtain the effect of expanded graphite content on the thermal conductivity of NaNO 3-KNO 3/EG composite thermal storage materials,NaNO 3-KNO 3/EG composites were prepared by aqueous solution method using NaNO 3-KNO 3 eutectic salt as thermal storage material and different contents of expanded graphite(EG)as the matrix material.The latent heat and thermal conductivity of the composites were measured by simultaneous thermal analyzer(STA)and laser flash apparatus(LFA),respectively.The results showed that the latent heat of NaNO 3-KNO 3/EG composites decreased with the increase of EG content,and the thermal conductivity was significantly improved compared with that of pure nitrate.the average thermal conductivity of the composites was 3.95 W/(m-K)at 20%mass fraction of EG,which was 7.4 times higher than that of nitrate.The preparation of composite thermal storage materials by adding EG to binary nitrates is a promising candidate for improving their heat transfer performance.

关 键 词：硝酸盐 膨胀石墨 储热 水溶液法 

分 类 号：TK02[动力工程及工程热物理]