The invention belongs to the technical field of medium-deep
geothermal heating, and relates to a medium-deep
geothermal energy closed type heat taking and using integrated
heating system and an operation method thereof. Closed circulation heat extraction of
geothermal energy is achieved through the coaxial double-
pipe heat exchanger, and a working medium can circularly absorb heat underground through a communicating structure of an outer
pipe and an inner
pipe of the coaxial double-pipe
heat exchanger. The
plate heat exchanger directly utilizes a high-temperature working medium to exchange heat and supply heat in the
system starting stage, and the response speed is increased; the flash tank performs gas-liquid separation according to the working medium state, a gas-phase working medium enters a subsequent
heat pump cycle for temperature rise, and a liquid-phase working medium returns to a geothermal heat removal loop, so that gradient utilization of energy is realized; the heat regenerator preheats a working medium by recovering
waste heat and forms efficient
heat pump circulation with the compressor, the
gas cooler and the expansion valve, and the energy efficiency of the
system is remarkably improved. According to the invention, the intermediate heat exchange link is reduced, the operation
energy consumption is reduced, and the comprehensive efficiency of
geothermal energy utilization is further improved.