矿井深部热能存取一体化系统研究

Research on the storage-extraction integrated system of thermal energy in deep mines

为解决我国煤矿资源深部开采时的热害问题,提出了一种矿井深部热能存取一体化系统的设想,剖析了该系统的内涵与技术框架,介绍了该系统内井下围岩取能系统、地面热交换系统、蓄热系统及智能监控系统协同运行过程。该系统在巷道围岩水平钻孔并布置取热换热器提取围岩地热能,经井下热泵机组进行地热能的转换与输送,部分热能用于地面供热系统,富裕热能储存于蓄热系统以达到工作面降温需求。阐述了围岩热能高效提取、地下空间充填蓄热,集成稳定性控制、污染物防治与安全保障等关键技术,提出建立地面井下空间维度上的热能“共建—共储—共享”模式。针对系统运行优化管理,考虑以热需求与冷需求为双重目标配置优化开采工艺与运行策略的协同度,提出将工作面风流温度降至26℃时所采集的岩层热量为地面供热量及采空区储热量之和。

To solve the problem of thermal pollution during deep coal mining in China,we put forward an integrated system of thermal energy access in deep mine,and analyzed the connotation and technical framework of the system,introduced the cooperative operation process of the system,including the heat extraction system,the ground heat exchange system,the heat storage system and the grouting system.In the system,a horizontal hole is drilled in the surrounding rock of the roadway and heat exchangers are arranged to extract the geothermal energy of the surrounding rock,which are converted and transported by the underground heat pump unit.Part of the thermal energy is used in the ground heating system,and the abundant thermal energy is stored in the thermal storage system to meet the working face cooling demand.The key technologies such as efficient extraction of thermal energy from surrounding rock,heat storage by filling underground space,stability control of integrated system,prevention and control of pollutants and safety guarantee were described,a model of“Co-construction,co-storage and co-sharing”of thermal energy in surface underground space was proposed.Aiming at the optimal management of system operation,the coordination degree of optimal mining technology and operation strategy was considered with the dual objective of heat demand and cold demand.It is put forward that when the air flow temperature of the working face is reduced to 26℃,the heat collected from the rock stratum is the sum of the heat supply from the ground and the heat storage in the goaf.