硝酸钠/兰炭灰复合相变储热材料的制备及性能

Preparation and properties of sodium nitrate/semi-coke ash shape-stable phase change composite

工业固废兰炭灰(SCA)大量堆积会造成局部生态环境破坏,为促进工业固废兰炭灰的规模化消纳及复合相变储热材料(SSPCCs)的低成本制备,创新提出兰炭灰作为骨架材料制备复合相变储热材料。为研究兰炭灰骨架复合相变储热材料的可行性,制备了8种不同比例的NaNO_(3)/兰炭灰复合相变储热材料,采用差示扫描量热法、激光导热分析法、微观形貌分析法、定速加压法和X射线衍射法对NaNO_(3)/兰炭灰复合相变储热材料的关键性能进行表征。结果表明,未发生明显泄露和形变的样品NaNO_(3)/SCA-50具有最佳兰炭灰与NaNO_(3)质量比(5∶5),其抗压强度达到96.98 MPa,100~380℃范围内储热密度达到338.24 J/g;经4027次加热/冷却循环后,样品NaNO_(3)/SCA-50保持良好的热稳定性和化学相容性。兰炭灰作为骨架材料制备复合相变储热材料具有较好的可行性,为工业固废兰炭灰的资源化利用提供了新的途径。

The massive accumulation of industrial solid waste semi-coke ash(SCA)will cause damage to local ecological environment.To promote the large-scale consumption of industrial solid waste semi-coke ash and fabricate low-cost shape-stable phase change composites(SSPCCs),semi-coke ash was innovatively proposed as a skeleton material to fabricate the SSPCCs.To evaluate the feasibility of the semi-coke ash as the skeleton material of the SSPCCs,eight NaNO_(3)/semi-coke ash SSPCC samples with different mass ratio of the semi-coke ash to NaNO_(3) were fabricated.The key performance of the NaNO_(3)/semi-coke ash SSPCCs were investigated by the differential scanning calorimetry,laser flash analysis,scanning electron microscopy,constant speed pressurization method and X-ray diffraction.Results show that the sample NaNO_(3)/SCA-50 without visual leakage and deformation holds the optimal mass ratio 5:5 of the semi-coke ash to NaNO_(3) with the thermal energy storage capacity of 338.24 J/g ranging from 100 to 380℃and the mechanical strength of 96.98 MPa.After 4027 heating/cooling cycles,the sample NaNO_(3)/SCA-50 keeps good thermal stability and chemical compatibility,which indicates that the semi-coke ash is feasible for the SSPCCs fabrication,and provides a new way for recycling the resource of the solid waste semi-coke ash.