火山石作为经济可靠的低温储热材料的可行性分析

Feasibility Analysis of Volcanic Rocks as an Economical and Reliable Low-temperature Heat Storage Material

设计并制备了成本较低、性能较好的新型热化学储能材料,并探究了其在建筑中应用的可行性。以云南省地区易开采的火山石作为骨架基质,提出了2种制备方案。通过火山石与MgCl_(2)和CaCl_(2)的结合,分别制备出了基于天然大孔的石-MgCl_(2)、石-CaCl_(2)和粉末酸洗并重新压制的块-MgCl_(2)、块-CaCl_(2),并对所制备的材料进行了表征、同步热分析(DSC)测量、经济性分析和可行性分析。结果表明:火山石的主要孔隙结构为大孔(孔径>100 nm),很容易被水合盐填充;石-CaCl_(2)、石-MgCl_(2)、块-CaCl_(2)和块-MgCl_(2)的热化学储能密度分别为641 kJ/kg、983 kJ/kg、440 kJ/kg和733 kJ/kg;石-CaCl_(2)、石-MgCl_(2)的储能密度成本低至0.010 7元/kJ和0.017 4元/kJ,相比于已有研究材料,所制备的材料在经济角度具备明显优势;与可再生能源结合后,所制备的材料具备明显的污染物减排潜力,且也适合供热需求大的北方地区。

A new thermochemical energy storage material with lower cost and better performance was prepared,and the feasibility of its application in buildings was explored.The easily mined volcanic rocks in Yunnan area were used as the matrix.Two preparation schemes were proposed that MgCl_(2) and CaCl_(2) were combined with either raw volcanic rocks or pickled volcanic rocks powder and were repressed into blocks.These prepared materials were nominated as stone-MgCl_(2),stone-CaCl_(2),block-MgCl_(2) and block-CaCl_(2),respectively.Their characterization,differential scanning calorimetry(DSC)analysis,economic analysis and feasibility analysis were conducted.Results show that the main pore structure of raw volcanic rocks is macropore(the pore size>100 nm),which can be easily filled by hydrated salts.The thermochemical energy storage density of stone-CaCl_(2),stone-MgCl_(2),block-CaCl_(2) and block-MgCl_(2) is 641 kJ/kg,983 kJ/kg,440 kJ/kg and 733 kJ/kg,respectively.The energy storage cost of prepared stone-CaCl_(2) and stone-MgCl_(2) is as low as 0.0107 yuan/kJ and 0.0174 yuan/kJ,respectively.Comparing with the existing materials,they have obvious advantages in the view of economy.When they are combined with renewable energy,these prepared materials have obvious potential for pollutant reduction and are also suitable for the northern regions with high heating demand.