类离子液体相变储能理论及在盐湖镁、氯资源规模化利用中的应用基础研究

Salt lake magnesium and chlorine has limited the integral exploration of salt lake resources. Existing large scale magnesium and chlorine market has reached equilibrium, and new technology and routes for integral utilisation in their utilisation should be developed. The success of the research will improve the solution of the limitation of salt lake resources and can push forward the development of salt lake resources..The project team has already started research work in pseudo-ionic liquids phase change energy storage materials. The proposed project will be based on the previous work to use pseudo-ionic liquids (low to medium temperature melt salt) in the field of phase change energy storage. The detailed objectives are as follows..(1) Through the investigation of the mechanism of pseudo-ionic liquids phase change energy storage, the thermodynamics and kinetics and heat and mass transfer mechanism in phase change process, the nature and mechanism of phase change energy storage will be revealed and theoretical model can be established for ionic liquids heat and mass transfer. .(2) Understanding of heat resistance formation mechanism in the phase change of pseudo-ionic liquids energy storage system and the correlation of micro-scale energy and macro-scale energy transfer intensification, will help to obtain the physical properties of heat transfer media, and the relationship between phase change structural unit and heat storage and release, facilitating in designing new intensification methods in energy storage..(3) Through the investigation of the ultra-cooling, tolerance, heat conductivity and thermal physical properties of magnesium and chlorine containing pseudo-ionic liquids, the key and fundamental problems can be solved for their large scale applications. .The implementation of the project will not only facilitate the understanding of the theory in phase change energy storage, but also provide theoretical support and fundamental data in large scale exploration of salt lake magnesium and chlorine resources, which is significant for both theory and practice.

盐湖镁、氯资源规模化利用问题亟待解决。研究镁、氯资源综合利用的新产品、新技术和新途径，拓展新的应用领域，可以解决制约盐湖资源综合利用的瓶颈问题，对盐湖资源综合利用的整体发展水平具有重大推动作用。.本项目拟将类离子液体（中低温熔盐）用于相变储能领域。通过研究类离子液体相变储能机理、热力学、动力学和热、质传输机制，探明类离子液体相变储能的本质，并建立类离子液体热、质传输模型和热物理性质理论预测模型。揭示类离子液体相变储能体系热阻形成机制、以及微尺度能量传递强化与大尺度能量传递强化的关联机制，掌握储热介质物性、相变体系单元结构与储、放热性能的关联规律。通过对类离子液体体系耐受性、导热性等性质的研究，解决制约含镁、氯类离子液体规模化应用中的关键和基础性问题。.项目的实施不仅可以完善相变储能的基础理论，而且可为盐湖副产镁、氯资源的规模化利用提供理论指导和基础数据支撑，具有重要的理论价值和现实意义。

盐湖镁、氯资源规模化利用问题亟待解决，盐湖水合盐基相变储能材料的开发不仅有助于解决制约盐湖资源综合利用的瓶颈问题，而且对提高能源利用效率具有重要的现实意义。. 本项目取得研究成果如下：. （1）以盐湖镁盐、钠盐和硼酸等初级产品为原料，合成了ISL-70、ISL-87等系列类离子液体相变储能材料，解决了所合成相变材料存在的蒸汽压高和性能衰减问题，显著改善了相变材料应用过程中的循环稳定性，降低了对容器的腐蚀性；. （2）合成了ISL-155、ISL-135、ISL-60、ISL-40、ISL-33、ISL-8等多种相变储能材料，均具有良好的吸放热循环性能和较高的相变潜热。并以膨胀石墨与相变材料复合，制备了多种定形相变材料，有效减少了体系的过冷度，百次循环后相变温度波动一般在1℃以内，相变焓的变化在1%以内，稳定性和可靠性均进一步提高，同时抑制了相变材料的泄露；. （3）应用多种具有不同尺寸的二氧化硅介孔材料制备了新型定形相变材料，发现相变温度变化量与介孔硅孔径的倒数表现出很强的线性关系。限域空间内的材料相变温度可调窗口超过90℃。相对纯相物质，最大储热效率可达72%。实现了相变材料热行为的可控调节；. （4）针对清洁供暖需求，项目组与应用企业开展了广泛的交流与合作，建立了相变材料生产装置，累计为企业提供ISL-87等样品500公斤。并在分布式供热设备上，获取了百公斤级相变材料吸放热应用测试数据。所开发的新型供热用相变储能材料克服了循环稳定性、腐蚀性和批量化生产等关键技术问题，相变焓达到280 J.g-1 以上，在千次宏量吸放热循环实验后，无明显的性能衰减；. （5）开展了相变蓄热换热器的设计与示范验证工作，形成了10kW/40kWh的ISL51相变蓄热换热器工程样机，获取了所开发相变材料长期循环稳定性和工况条件下的腐蚀数据，完成了区域性供暖用相变材料的中试测试；. 项目的实施不仅探索了类离子液体相变储能材料的热物性变化规律，拓展了相变储能材料的种类，而且为盐湖副产镁、氯资源的规模化利用提供了理论指导和数据支撑，具有重要的理论价值和现实意义。