单井地热联合太阳能供暖系统性能模拟  

Performance simulation of a single geothermal well combined with a solar energy heating system

作　　者：卜宪标[1,2,3] 冉运敏 李华山 张冬冬[5] 雷军民 王令宝 BU Xianbiao;RAN Yunmin;LI Huashan;ZHANG Dongdong;LEI Junmin;WANG Lingbao(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Key Laboratory of Renewable Energy,Chinese Academy of Sciences,Guangzhou 510640,China;Guangdong Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;Jimo Thermal Power Plant,Qingdao 266200,China;Lanzhou LS Energy Equip.Int′l Engineering Co.,Ltd.,Lanzhou 730314,China)

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学院可再生能源重点实验室,广东广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广东广州510640 [4]中国科学院大学,北京100049 [5]即墨热电厂,山东青岛266200 [6]兰州兰石能源装备工程研究院有限公司,甘肃兰州730314

出　　处：《哈尔滨工程大学学报》2020年第3期397-403,454,共8页Journal of Harbin Engineering University

基　　金：国家重点研发项目(2018YFB1501805);广东省自然科学基金项目(2018A030313018).

摘　　要：为获得单井地热联合太阳能供暖系统的性能,本文建立了单井地热存取热以及太阳能集热器和热泵系统的数学模型,采用三对角矩阵算法对模型进行了求解。研究结果表明:单井地热的输出功率调节主要是由注入水温度和流量决定的;单井地热具有宽负荷调节能力,最小输出功率是最大值的72.61%,两者相差223.50 kW。利用地热的宽负荷调节能力可解决太阳能的不稳定性;太阳能集热器的功率和面积由地热的负荷调节能力决定。3 km深地热井,热泵平均输出功率720.81 kW,匹配的太阳能集热器功率约95.00 kW,集热器面积270 m^2;非供暖季的储热虽不能明显提高供暖时的取热功率,但可以缓解取热功率随时间的衰减。研究结果可为单井地热联合太阳能供暖系统的设计和运行提供指导。To acquire the performance of combined heating with single well geothermal and solar energy, Equations describing the heat acquisition and storage by a single geothermal well, solar collector and heat pump performance are developed, and the load matching and heating performance of a single well geothermal-solar heating system are analyzed,and solved by tri-diagonal matrix algorithm. The output heat power extracted from a single well is determined by the temperature and velocity of the injection water. The geothermal single well has a wide load regulating ability, and the minimum output heat power was 72.61% of the maximum value, and the difference between the maximum and minimum value was 223.50 kW. The instability of the solar energy can be solved utilizing the wide load regulating ability of geothermal energy, wherein the area and power of the solar collectors are decided by the load regulating ability. The average output power of the heat pump was 720.81 kW for a geothermal well depth of 3 km, and the area and power of matching solar collectors were respectively 270 m^2 and 95.00 kW. The heat power extracted from the geothermal well was not improved by heat storage during the non-heating season, but power attenuation with time can be slowed by heat storage. The research findings can provide basis and direction for the design and operation of combined heating with single well geothermal and solar energy.

关 键 词：地热供暖 太阳能供暖 井下换热器 负荷匹配 地热单井 深井换热器 地热太阳能耦合 

分 类 号：TK52[动力工程及工程热物理—热能工程]