兰炭灰固碳对复合相变储热材料性能的影响

Effect of semi-coke ash carbon capture on property of phase change composites

为推动“双碳”战略,促进工业固废兰炭灰的低成本消纳,开发新型绿色低碳复合材料,提出在已有的兰炭灰/硝酸钠复合相变储热材料基础上,利用兰炭灰进行碳捕捉。对固碳前、后兰炭灰及复合相变储热材料的性能进行研究。结果表明:兰炭灰碳捕集的最佳条件为气体组分20%CO_(2)/80%N_(2)、通气时间40 min、加热温度650℃;在最佳实验条件下,兰炭灰的固碳率达到29.27%,所制得的复合相变储热材料固碳兰炭灰/NaNO_(3)的最佳质量比为5:5,在100~380℃储热密度达到288.65 J/g,拥有更好的机械性能、热稳定性及化学相容性。固碳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和碳排放处理提供了新的途径。

To achieve the carbon peak and neutrality targets,facilitate low-cost disposal of industrial solid wastes(namely semi-coke ash),and develop new green and low-carbon composite materials,carrying out carbon capture using semi-coke ash is proposed,based on the existing semi-coke ash/sodium nitrate composite phase change heat storage materials.The performance of semi-coke ash and composite phase change heat storage materials before and after carbon sequestration is studied.The results indicate that,the optimal conditions for carbon sequestration in semi-coke ash are:gas composition of 20%CO_(2)/80%N_(2),ventilation time of 40 minutes,and heating temperature of 650℃.Under the optimal experimental conditions,the carbon sequestration rate of semi-coke ash reaches 29.27%.The optimal mass ratio of the resulting composite phase change heat storage material,namely the carbon-sequestered semi-coke ash to NaNO_(3)is 5:5.It achieves a heat storage density of 288.65 J/g at 100~380℃,with better mechanical properties,thermal stability,and chemical compatibility.The use of carbon-sequestered semi-coke ash as a skeletal material to prepare composite phase change heat storage materials is highly feasible,providing a new approach for the resource utilization and carbon emission treatment of industrial solid wastes,namely semi-coke ash.