CN-122015305-A - Geothermal energy comprehensive utilization system and method

CN122015305ACN 122015305 ACN122015305 ACN 122015305ACN-122015305-A

Abstract

The invention provides a geothermal energy comprehensive utilization system and a geothermal energy comprehensive utilization method, which relate to the technical field of geothermal energy utilization and comprise a coaxial sleeve geothermal well; the heat pump unit comprises a heat pump unit body, wherein a first heat exchange side of the heat pump unit body is connected with a coaxial sleeve geothermal well through a geothermal well water outlet pipeline and a geothermal well water inlet pipeline, a second heat exchange side of the heat pump unit body is connected with the user heat exchange unit body through a user water supply pipeline and a user water return pipeline, a ground buried pipe heat exchanger is connected with the geothermal well water inlet pipeline and the geothermal well water outlet pipeline respectively through a ground buried pipe water inlet pipeline and a ground buried pipe water outlet pipeline, and the problems that geothermal heating and refrigerating cannot be achieved in a long-term efficient stable operation effect in the conventional shallow geothermal resource exploitation and medium-deep geothermal resource exploitation mode in the areas with large building density and unbalanced cold and hot loads in the prior art are solved.

Inventors

GUO XINFENG
LI HAO
Gao Nanan
WANG ZIZHANG
YANG CHEN
WANG TIANREN

Assignees

中国石油化工集团有限公司
中国石化集团新星石油有限责任公司

Dates

Publication Date: 20260512
Application Date: 20241108

Claims (10)

1. A geothermal energy comprehensive utilization system, comprising: a coaxial sleeve geothermal well; A user heat exchange component; the first heat exchange side of the heat pump unit is connected with the coaxial sleeve geothermal well through a geothermal well water outlet pipeline and a geothermal well water inlet pipeline, and the second heat exchange side of the heat pump unit is connected with the user heat exchange component through a user water supply pipeline and a user water return pipeline; the ground heat exchanger is connected with the geothermal well water inlet pipeline and the geothermal well water outlet pipeline through a ground pipe water inlet pipeline and a ground pipe water outlet pipeline respectively.
2. The geothermal energy comprehensive utilization system according to claim 1, further comprising a buried pipe water outlet bypass pipe, wherein both ends of the buried pipe water outlet bypass pipe are connected to the buried pipe water outlet pipe and the geothermal well water inlet pipe, respectively.
3. The geothermal energy comprehensive utilization system according to claim 2, wherein the geothermal well water inlet pipe, the geothermal well water outlet pipe, the buried pipe water inlet pipe, the buried pipe water outlet pipe, the user water supply pipe, and the user water return pipe are respectively provided with a first data acquisition module, a second data acquisition module, a third data acquisition module, a fourth data acquisition module, a fifth data acquisition module, and a sixth data acquisition module.
4. The geothermal energy comprehensive utilization system of claim 3, wherein the first data acquisition module comprises a first flow sensor, a first pressure sensor, and a first temperature sensor, the second data acquisition module comprises a second flow sensor, a second pressure sensor, and a second temperature sensor, the third data acquisition module comprises a third flow sensor, a third pressure sensor, and a third temperature sensor, the fourth data acquisition module comprises a fourth flow sensor, a fourth pressure sensor, and a fourth temperature sensor, the fifth data acquisition module comprises a fifth flow sensor, a fifth pressure sensor, and a fifth temperature sensor, and the sixth data acquisition module comprises a sixth flow sensor, a sixth pressure sensor, and a sixth temperature sensor.
5. The geothermal energy comprehensive utilization system according to claim 4, wherein the user water supply pipe, the geothermal well water outlet pipe, and the buried pipe water inlet pipe are provided with a first circulation pump, a second circulation pump, and a third circulation pump, respectively.
6. A geothermal energy comprehensive utilization system according to claim 5 wherein the geothermal well water outlet pipe, the buried pipe water outlet bypass pipe, the geothermal well water inlet pipe, the buried pipe water inlet pipe, the end of the geothermal well water inlet pipe near the geothermal well water inlet pipe, the user water supply pipe, the user water return pipe, the end of the buried pipe water outlet pipe near the geothermal well water outlet pipe, the end of the geothermal well water outlet pipe near the buried pipe heat exchanger, the end of the buried pipe water inlet pipe near the buried pipe heat exchanger are respectively provided with a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, and a tenth valve.
7. The geothermal energy comprehensive utilization system of claim 6, further comprising a control unit, wherein the first data acquisition module, the second data acquisition module, the third data acquisition module, the fourth data acquisition module, the fifth data acquisition module, the sixth data acquisition module, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve are connected to the control unit.
8. The geothermal energy comprehensive utilization system according to claim 1, wherein the coaxial casing geothermal well comprises a central tube and a ring tube, the central tube is disposed inside the ring tube, and the bottom of the central tube is higher than the bottom of the ring tube, so that the lower end of the central tube is communicated with the lower end of the ring tube, and the geothermal well water outlet pipe and the geothermal well water inlet pipe are connected with the central tube and the ring tube, respectively.
9. A geothermal energy comprehensive utilization method, utilizing the geothermal energy comprehensive utilization system according to any one of claims 1 to 8, comprising: In summer, the ground heat exchanger is utilized to independently refrigerate; In a first heat load stage in winter, the coaxial sleeve geothermal well and the buried pipe heat exchanger are utilized to supply heat in a combined way; And when the heat load in winter is lower than that in the second heat load stage of the first heat load stage, the coaxial sleeve geothermal well is utilized for supplying heat independently.
10. The geothermal energy comprehensive utilization method according to claim 9, wherein when the geothermal energy comprehensive utilization system further comprises a buried pipe outlet bypass pipe, both ends of the buried pipe outlet bypass pipe are connected to the buried pipe outlet pipe and the geothermal well inlet pipe, respectively, the geothermal energy comprehensive utilization method further comprises: And in a third heat load stage with the heat load lower than that of the second heat load stage in winter, the coaxial sleeve geothermal well is utilized to supply heat and the heat supply tail water is utilized to supplement heat for the stratum where the buried pipe heat exchanger is positioned.

Description

Geothermal energy comprehensive utilization system and method Technical Field The invention belongs to the technical field of geothermal energy utilization, and particularly relates to a geothermal energy comprehensive utilization system and method. Background Geothermal resources are renewable clean energy sources, and have the characteristics of large storage capacity, wide distribution in the earth and strong stability, and are widely applied to the fields of heating, refrigeration, power generation, bathing and the like at present. Geothermal resources can be classified into shallow geothermal resources and medium-deep geothermal resources according to depths. The shallow geothermal resource refers to energy contained in shallow rock soil or water with depth of 200m, the partial energy is low-grade energy, annual temperature almost does not change, a ground source heat pump system is generally adopted to develop and utilize the shallow geothermal resource, the shallow geothermal resource can be used for heating and refrigerating, but the shallow geothermal resource has the problems of poor anti-interference capability and large occupied area, is limited in areas with high building density and high land cost, and is used in areas with unbalanced cold and hot loads, and the soil is unbalanced in cold and hot caused by long-term use due to poor soil heat recovery capability, so that the efficiency of a heat pump unit is reduced, and long-term stable and efficient operation cannot be ensured. The medium-deep geothermal resource refers to the energy contained in rock soil with the depth of 1000m-3000m, the medium-deep geothermal energy has large storage capacity, high water outlet temperature compared with the shallow geothermal energy, and strong soil heat recovery capability, and the application method can be divided into water heating type and heat exchange type, wherein the heat exchange type does not need to extract geothermal fluid, the heat of the medium-deep soil is deeply exchanged underground by utilizing a double-pipe heat exchanger, deep underground hot water is not needed to be extracted, the problems of water level drop, ground subsidence and the like caused by excessive water extraction are avoided, meanwhile, the occupied area is remarkably small, and the system is suitable for the area with larger building density and is a exploratory development mode started in recent years. But can only be used for heating in winter generally, can not cool, and has limited application scenes. Therefore, for areas with large building density and unbalanced cold and hot loads, the conventional geothermal heating and refrigerating system cannot achieve the effect of long-term efficient and stable operation, and development of an efficient geothermal energy development, utilization and operation scheme is needed. Disclosure of Invention The invention aims to provide a geothermal energy comprehensive utilization system and method for overcoming the defects in the prior art, and solves the problems that the conventional shallow geothermal resource exploitation and medium-deep geothermal resource exploitation modes are used for geothermal heating and refrigeration in areas with large building density and unbalanced cold and hot loads in the prior art, and the long-term efficient and stable operation effect cannot be achieved. In order to achieve the above object, the present invention provides a geothermal energy comprehensive utilization system, comprising: a coaxial sleeve geothermal well; A user heat exchange component; the first heat exchange side of the heat pump unit is connected with the coaxial sleeve geothermal well through a geothermal well water outlet pipeline and a geothermal well water inlet pipeline, and the second heat exchange side of the heat pump unit is connected with the user heat exchange component through a user water supply pipeline and a user water return pipeline; the ground heat exchanger is connected with the geothermal well water inlet pipeline and the geothermal well water outlet pipeline through a ground pipe water inlet pipeline and a ground pipe water outlet pipeline respectively. Optionally, the underground pipe water outlet pipeline is further arranged, and two ends of the underground pipe water outlet pipeline are respectively connected with the underground pipe water outlet pipeline and the geothermal well water inlet pipeline. Optionally, the geothermal well water inlet pipeline, the geothermal well water outlet pipeline, the buried pipe water inlet pipeline, the buried pipe water outlet pipeline, the user water supply pipeline and the user water return pipeline are respectively provided with a first data acquisition module, a second data acquisition module, a third data acquisition module, a fourth data acquisition module, a fifth data acquisition module and a sixth data acquisition module. Optionally, the first data acquisition module includes a first flow sensor, a first p