Interference-free middle-deep-stratum geothermal resource gradient utilization heating system

Abstract

The invention discloses an interference-free middle-deep-stratum geothermal resource gradient utilization heating system. The interference-free middle-deep-stratum geothermal resource gradient utilization heating system comprises a casing pipe (1), a heat insulation pipe (2), a heat exchanger (7), a high-temperature heat pump (8) and a low-temperature heat pump (9). According to the interference-free middle-deep-stratum geothermal resource gradient utilization heating system, through a three-level system including the heat exchanger, the high-temperature heat pump and the low-temperature heatpump, the high-grade portion, the middle-grade portion and the low-grade portion in geothermal energy can be sequentially absorbed and utilized, the middle-deep-stratum geothermal resource gradient utilization heating purpose is finally achieved, and the energy efficiency ratio and the heating load of the heating system are significantly increased. The heat insulation pipe (especially a vacuum heat insulation pipe) is taken as a central pipe, therefore, the heat dissipation capacity of water in the central pipe can be effectively reduced, and the grade of the geothermal energy can be effectively kept. Meanwhile, the advantages of an interference-free geothermal exploitation mode adopting the vacuum heat insulation pipe and the geothermal resource gradient utilization heating system are combined, and therefore the characteristics of being efficient, environmentally friendly and capable of achieving sustainable utilization are achieved.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy development, and particularly designs a heating system for cascaded utilization of mid-deep geothermal resources without interference. Background technique [0002] At present, about 8% of primary fossil energy is used for heating in winter in my country every year, and the dust and SO 2 It has also become the main cause of urban smog, and using geothermal resources for heating is an effective means to alleviate urban smog pollution. In the current medium and deep geothermal energy heating technology, the non-interference mining method with PE pipe as the central pipe is mainly used. Due to the high thermal conductivity of PE pipe, the problem of low outlet water temperature and thermal recovery power is caused. At the same time, in the current medium-deep geothermal energy heating technology, the method of mixing water + single-stage heat pump is mainly used to improve the grade of the...

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Problems solved by technology

However, in the current medium-deep geothermal energy heating technology, the non-interference mining method with PE pipe as the central pipe is mainly used. Due to the high thermal conductivity of PE pipe, the problem of low outlet water temperature and thermal recovery power is caused.

At the same time, in the current medium-deep geothermal energy heating technology, the method of mixing water + single-stage heat pump is mainly used to improve the grade of the mined geothermal energy for heating. Significantly reduced, resulting in increased power consumption of the heat pump and reduced overall energy efficiency of the system

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