Medium-length layer geothermal energy absorption and compression type integrated concentration heat supply system

Abstract

The invention discloses a medium-length layer geothermal energy absorption and compression type integrated concentration heat supply system, and relates to the field of geothermal energy heat supply engineering. Due to stepped arrangement of an absorption heat pump, a two-stage compression heat pump and a three-stage compression heat pump, geothermal energy can be extracted in a multi-stage and gradient mode, extra medium temperature heat is added for heating secondary net circulating water, heat is supplied to a user, compared with a conventional concentration heat supply mode and the geothermal energy utilization mode, the system can achieve deep stepped utilization of medium-length geothermal resources, the heat supply capability and the unit heat obtaining amount of the system are increased, the heat supply area is increased, the geothermal energy comprehensive utilization rate is increased, the high-grade energy dissipation is lowered, no fossil energy is needed, no heat source plant is needed, meanwhile, a heat source plant, an origin station and a heat exchange station are combined into one, the concentration heat source design capacity and pipe network laying length are lowered, the building cost of a heat supply system is lowered, the heat supply process is simplified, the technical effect of efficiently utilizing medium-length layer geothermal resources is achieved, and practicability is high.

Description

technical field [0001] The invention relates to the field of geothermal energy heating engineering, in particular to a medium-deep geothermal energy absorption and compression integrated central heating system. Background technique [0002] The reserve of geothermal resources in my country is one-sixth of the total geothermal resources in the world. Among them, the amount of mid-deep geothermal resources is equivalent to 853 billion tons of standard coal, and now 640 million tons of standard coal can be used every year. The amount of mid-deep geothermal resources replaces the standard coal, which can reduce 1.3 billion tons of carbon dioxide emissions; the amount of hot dry rock resources is equivalent to 860 trillion tons of standard coal, equivalent to 260,000 times the current national energy consumption, and is in the development and utilization research stage. [0003] At present, my country's heating methods using geothermal resources can be divided into two types: dire...

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Problems solved by technology

[0004] At present, compression heat pumps use shallow geothermal resources indirectly. Because of the increasingly serious environmental protection problems, it is necessary to ensure the thermal balance of shallow geothermal heat throughout the year. In summer, all of them must be discharged back into the ground, which greatly limits the flexibility and actual operation effect of compression heat pumps in utilizing shallow geothermal resources.

For mid-deep geothermal resources, although there is no need to consider the problem of annual heat balance, the temperature of the middle-deep water outlet is relatively high, and the compression heat pump has certain restrictions on the temperature of low-temperature heat sources, which hinders the indirect utilization of mid-deep geothermal energy. application of resources

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