Geothermal energy heating and refrigerating system and control method thereof

Abstract

The invention provides a geothermal energy heating and refrigerating system and a control method thereof, and relates to the technical field of geothermal energy utilization, and the specific implementation scheme is as follows: a middle-deep layer geothermal subsystem and a shallow layer geothermal subsystem are combined, so that a heating and refrigerating terminal provides a heating service or a refrigerating service; therefore, the construction cost and risk of the geothermal energy heating and refrigerating system can be reduced; in the early heating stage, the middle heating stage or the early cooling stage, the control module controls the middle-deep layer geothermal subsystem so that the heating and cooling terminal can provide heating service or cooling service. And in the later stage of heating or cooling, the control module controls the middle-deep layer geothermal subsystem and the shallow layer geothermal subsystem to enable the heating and cooling terminal to provide heating service or cooling service, so that the heating and cooling requirements of the heating and cooling terminal can be met on the premise of reducing the construction cost and risk, and the heat attenuation of geothermal energy is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of geothermal energy utilization, and in particular to a geothermal energy heating and cooling system and a control method thereof. Background Art

[0002] Geothermal resources are a clean, renewable energy source with vast reserves, wide distribution, and excellent stability. Their development and utilization are of great significance for energy conservation and emission reduction. Geothermal heating and cooling are important methods for developing and utilizing geothermal resources, offering advantages such as cleanliness, pollution-free operation, low operating costs, and high returns from comprehensive resource utilization. In areas lacking conventional energy sources but with the conditions for geothermal resource development, utilizing geothermal resources for heating and cooling holds broad prospects. Summary of the Invention

[0003] The present disclosure provides a geothermal heating and cooling system and a control method thereof.

[0004] According to a first aspect of the present disclosure, a geothermal heating and cooling system is provided, comprising:

[0005] The medium-deep geothermal subsystem includes:

[0006] Production wells, used to extract geothermal water from deep underground;

[0007] Recharge wells, used to store geothermal water in a cooled state;

[0008] The primary plate heat exchanger is used to exchange heat between geothermal water from the mining well and circulating water from the heating and cooling terminal. The geothermal water from the mining well flows into the secondary plate heat exchanger after heat exchange, and the circulating water from the heating and cooling terminal flows into the heating and cooling terminal after heat exchange.

[0009] The secondary plate heat exchanger is used to exchange heat between the geothermal water from the primary plate heat exchanger and the circulating water from the heating and cooling terminal, or to exchange heat between the geothermal water from the reinjection well and the circulating water from the heating and cooling terminal, wherein the geothermal water from the primary plate heat exchanger flows into the reinjection well, and the geothermal water from the reinjection well flows into the production well after heat exchange;

[0010] The medium-deep geothermal heat pump unit is used to change the temperature of the circulating water after heat exchange in the secondary plate heat exchanger. The circulating water after temperature change treatment flows into the heating and cooling terminal.

[0011] Shallow geothermal subsystem, including:

[0012] Shallow geothermal holes for exchanging heat between circulating water after heat exchange in the secondary plate heat exchanger and the soil to store heat, and / or for exchanging heat between circulating water from the heating and cooling terminal and the soil;

[0013] Shallow soil source heat pump unit is used to perform temperature change treatment on the circulating water after heat exchange through shallow geothermal holes. The circulating water after temperature change treatment flows into the heating and cooling terminal.

[0014] The control module is used to control the medium-deep geothermal subsystem and / or the shallow geothermal subsystem so that the heating and cooling terminal provides heating service or cooling service.

[0015] According to a second aspect of the present disclosure, there is provided a control method for the geothermal heating and cooling system according to the first aspect, comprising:

[0016] Obtaining Phase I information for geothermal heating and cooling systems;

[0017] According to the first stage information, the mid-deep geothermal subsystem and / or the shallow geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0018] In the technical solution disclosed herein, the geothermal heating and cooling system combines a medium-deep geothermal subsystem with a shallow geothermal subsystem so that the heating and cooling terminal provides heating services or cooling services, thereby reducing the construction cost and risk of the geothermal heating and cooling system; in the early stage of heating, the middle stage of heating, or the early stage of cooling, the control module controls the medium-deep geothermal subsystem so that the heating and cooling terminal provides heating services or cooling services; in the late stage of heating or the late stage of cooling, the control module controls the medium-deep geothermal subsystem and the shallow geothermal subsystem so that the heating and cooling terminal provides heating services or cooling services, thereby meeting the heating and cooling needs of the heating and cooling terminal and reducing geothermal heat attenuation under the premise of reducing construction costs and risks.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute a limitation of the present disclosure.

[0021] Figure 1 is a block diagram of a geothermal heating and cooling system provided according to an embodiment of the present disclosure;

[0022] Figure 2 is a block diagram of a geothermal heating and cooling system provided according to an embodiment of the present disclosure;

[0023] Figure 3 is a block diagram of a geothermal heating and cooling system provided according to an embodiment of the present disclosure;

[0024] Figure 4is a block diagram of a geothermal heating and cooling system provided according to an embodiment of the present disclosure;

[0025] Figure 5 is a flow chart of a method for controlling a geothermal heating and cooling system according to an embodiment of the present disclosure;

[0026] Figure 6 is a flow chart of a method for controlling a geothermal heating and cooling system according to an embodiment of the present disclosure;

[0027] Figure 7 This is a flow chart of a control method for a geothermal heating and cooling system provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0029] In the description of the present disclosure, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0030] Geothermal resources are a clean, renewable energy source with vast reserves, wide distribution, and excellent stability. Geothermal heating is one of the key methods for developing and utilizing geothermal resources. Geothermal resources offer advantages such as cleanliness, low operating costs, and high returns from comprehensive resource utilization. Geothermal development holds broad prospects in areas facing conventional energy shortages and with the necessary conditions to develop geothermal resources.

[0031] Geothermal wells are wells that use drilling technology to directly extract geothermal resources from the ground. Extracting geothermal wells is the primary method for developing and utilizing geothermal resources. Geothermal wells include, but are not limited to, medium-deep geothermal wells and shallow geothermal wells. In some embodiments, medium-deep geothermal wells are those that extract geothermal water from medium-deep underground layers; shallow geothermal wells are those that extract geothermal resources from shallower soil layers.

[0032] Figure 1 FIG. 1 is a block diagram of a geothermal heating and cooling system according to an embodiment of the present disclosure. Figure 1As shown, the geothermal heating and cooling system 1000 includes but is not limited to a mid-deep geothermal subsystem 1100 , a shallow geothermal subsystem 1200 , and a control module 1300 .

[0033] The mid-deep geothermal subsystem 1100 includes but is not limited to a production well 1101 , a reinjection well 1102 , a primary plate heat exchanger 1103 , a secondary plate heat exchanger 1104 and a mid-deep geothermal heat pump unit 1105 .

[0034] In some embodiments, the extraction well 1101 is used to extract geothermal water from deep underground. Exemplarily, the extraction well 1101 is a mid-deep geothermal well.

[0035] In some embodiments, the recharge well 1102 is used to store geothermal water in a cooled state.

[0036] In some embodiments, the primary plate heat exchanger 1103 is used to exchange heat between geothermal water from the mining well 1101 and circulating water from the heating and cooling terminal 2000. The geothermal water from the mining well 1101 flows into the secondary plate heat exchanger 1104 after heat exchange, and the circulating water from the heating and cooling terminal 2000 flows into the heating and cooling terminal 2000 after heat exchange.

[0037] In some embodiments, the secondary plate heat exchanger 1104 is used to exchange heat between the geothermal water from the primary plate heat exchanger 1103 and the circulating water from the heating and cooling terminal 2000. The geothermal water from the primary plate heat exchanger 1103 flows into the recharge well 1102 after heat exchange.

[0038] Optionally, in some embodiments, the secondary plate heat exchanger 1104 is further used to exchange heat between geothermal water from the recharge well 1102 and circulating water from the heating and cooling terminal 2000. The geothermal water from the recharge well 1102 flows into the production well 1101 after heat exchange.

[0039] In some embodiments, the mid-deep geothermal heat pump unit 1105 is used to perform temperature change treatment on the circulating water after heat exchange in the secondary plate heat exchanger 1104, and the circulating water after temperature change treatment flows into the heating and cooling terminal 2000.

[0040] like Figure 1 As shown, the shallow geothermal subsystem 1200 includes but is not limited to a shallow geothermal well 1201 and a shallow geothermal heat pump unit 1202 .

[0041] It should be noted that, in some embodiments, the shallow geothermal hole 1201 is a shallow geothermal well. Optionally, in some embodiments, the number of the shallow geothermal hole 1201 can be one or more.

[0042] In some embodiments, the shallow geothermal well 1201 is used to exchange heat between the circulating water after heat exchange in the secondary plate heat exchanger 1104 and the soil to store heat.

[0043] In some embodiments, the shallow geothermal wells 1201 are used to exchange heat between the circulating water from the heating and cooling terminal 2000 and the soil.

[0044] In some embodiments, the shallow geothermal wells 1201 are used to exchange heat between the circulating water after heat exchange in the secondary plate heat exchanger 1104 and the soil to store heat, and to exchange heat between the circulating water from the heating and cooling terminal 2000 and the soil.

[0045] In some embodiments, the shallow soil source heat pump unit 1202 is used to perform temperature change treatment on the circulating water after heat exchange through the shallow geothermal holes, and the circulating water after temperature change treatment flows into the heating and cooling terminal.

[0046] It should be noted that, in some embodiments, the shallow geothermal holes 1201 are also used to exchange heat between circulating water or other media and soil to store heat in the summer; in the winter, the circulating water is exchanged with the soil. In this way, the shallow geothermal holes 1201 can be used as soil heat exchangers to exchange heat with the soil, so as to transfer heat between different seasons and make up for the imbalance in heat distribution in seasonal time.

[0047] In some embodiments, the control module 1300 is used to control the mid-deep geothermal subsystem and / or the shallow geothermal subsystem to enable the heating and cooling terminal to provide heating services or cooling services.

[0048] Optionally, in some embodiments, the control module 1300 is specifically used to control the mid-deep geothermal subsystem 1100 so that the heating and cooling terminal 2000 provides heating services or cooling services.

[0049] Optionally, in some embodiments, the control module 1300 is specifically used to control the mid-deep geothermal subsystem 1100 and the shallow geothermal subsystem 1200 so that the heating and cooling terminal 2000 provides heating services or cooling services.

[0050] Optionally, in some embodiments, the control module 1300 is specifically used to control the mid-deep geothermal subsystem 1100 in the initial stage of heating, the middle stage of heating, or the initial stage of cooling so that the heating and cooling terminal 2000 provides heating service or cooling service.

[0051] As an example, the control module 1300 is specifically used to control the primary plate heat exchanger 1103 in the initial stage of heating so that the heating and cooling terminal 2000 provides heating services, and to exchange heat between the circulating water after heat exchange through the secondary plate heat exchanger 1104 and the soil of the shallow geothermal well 1201 to store heat; or, in the middle stage of heating, control the primary plate heat exchanger 1103, the secondary plate heat exchanger 1104 and the medium-deep geothermal heat pump unit 1105 so that the heating and cooling terminal 2000 provides heating services; or, in the initial stage of cooling, control the secondary plate heat exchanger 1104 and the medium-deep geothermal heat pump unit 1105 so that the heating and cooling terminal 2000 provides cooling services.

[0052] Optionally, in some embodiments, the control module 1300 is specifically used to control the deep geothermal subsystem 1100 and the shallow geothermal subsystem 1200 in the late heating period or the late cooling period so that the heating and cooling terminal 2000 provides heating services or cooling services.

[0053] As an example, the control module 1300 is specifically used to control the primary plate heat exchanger 1103, the secondary plate heat exchanger 1104, the medium-deep geothermal heat pump unit 1105, the shallow geothermal well 1201 and the shallow soil source heat pump unit 1202 in the late stage of heating so that the heating and cooling terminal 2000 provides heating services; or, in the late stage of cooling, control the secondary plate heat exchanger 1104, the medium-deep geothermal heat pump unit 1105, the shallow geothermal well 1201 and the shallow soil source heat pump unit 1202 so that the heating and cooling terminal 2000 provides cooling services.

[0054] In some embodiments, as Figure 2 As shown, in Figure 1 Based on the above, the mid-deep geothermal subsystem in the geothermal heating and cooling system provided by the embodiment of the present disclosure further includes: a first valve 1106 , a second valve 1107 , a third valve 1108 , a fourth valve 1109 , a fifth valve 1110 and a sixth valve 1111 .

[0055] The first port of the first valve 1106 is connected to the reinjection well 1102 , and the second port of the first valve 1106 is connected to the production well 1101 and the second port of the secondary plate heat exchanger 1104 .

[0056] A first port of the second valve 1107 is connected to the production well 1101 and a second port of the secondary plate heat exchanger 1104 .

[0057] A first port of the third valve 1108 is connected to the reinjection well 1102 and a first port of the first valve 1106 .

[0058] A first port of the fourth valve 1109 is connected to the second port of the third valve 1108 , and a second port of the fourth valve 1109 is connected to the second port of the second valve 1107 .

[0059] A first port of the fifth valve 1110 is connected to the second port of the second valve 1107 and the second port of the fourth valve 1109 , and a second port of the fifth valve 1110 is connected to the first port of the primary plate heat exchanger 1103 .

[0060] The first port of the sixth valve 1111 is connected to the second port of the second valve 1107, the second port of the fourth valve 1109 and the first port of the fifth valve 1110, and the second port of the sixth valve 1111 is connected to the second port of the first plate heat exchanger 1103 and the first port of the second plate heat exchanger 1104.

[0061] Optionally, in some embodiments, the control module 1300 is specifically used to control the first valve 1106, the second valve 1107 and the fifth valve 1110 to open, and control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to close at the initial stage of heating, and use the primary plate heat exchanger 1103 to enable the heating and cooling terminal 2000 to provide heating services.

[0062] Optionally, in some embodiments, the control module 1300 is specifically used to control the first valve 1106, the second valve 1107 and the fifth valve 1110 to open, and control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to close in the middle period of heating, and utilize the first-stage plate heat exchanger 1103, the second-stage plate heat exchanger 1104 and the medium-deep geothermal heat pump unit 1105 to enable the heating and cooling terminal 2000 to provide heating services.

[0063] Optionally, in some embodiments, the control module 1300 is specifically used to control the first valve 1106, the second valve 1107 and the fifth valve 1110 to open, and control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to close in the later stage of heating, and utilize the first-level plate heat exchanger 1103, the second-level plate heat exchanger 1104, the medium-deep geothermal heat pump unit 1105 and the shallow soil source heat pump unit 1202 to enable the heating and cooling terminal 2000 to provide heating services.

[0064] Optionally, in some embodiments, the control module 1300 is specifically used to control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to be open, and control the first valve 1106, the second valve 1107 and the fifth valve 1110 to be closed at the initial stage of cooling, and utilize the secondary plate heat exchanger 1104 and the medium-deep geothermal heat pump unit 1105 to enable the heating and cooling terminal 2000 to provide cooling services.

[0065] Optionally, in some embodiments, the control module 1300 is specifically used to control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to be open, and control the first valve 1106, the second valve 1107 and the fifth valve 1110 to be closed in the late cooling stage, and utilize the secondary plate heat exchanger 1104, the medium-deep geothermal heat pump unit 1105 and the shallow soil source heat pump unit 1202 to enable the heating and cooling terminal 2000 to provide cooling services.

[0066] It should be noted that, in some embodiments, the control module 1300 controls at least one of the first valve 1106, the second valve 1107, the third valve 1108 and the fourth valve 1109 to open or close, so that geothermal water can be circulated between the production well 1101 and the recharge well 1102 without adding existing equipment and changing the original process technology.

[0067] In some embodiments, as Figure 3 As shown, in Figure 2 Based on the above, the mid-deep geothermal subsystem in the geothermal heating and cooling system provided by the embodiment of the present disclosure further includes: a seventh valve 1112 and an eighth valve 1113 .

[0068] The first port of the seventh valve 1112 is connected to the third port of the secondary plate heat exchanger 1104 , and the second port of the seventh valve 1112 is connected to the first port of the shallow geothermal hole 1201 .

[0069] The first port of the eighth valve 1113 is connected to the fourth port of the secondary plate heat exchanger 1104 , and the second port of the eighth valve 1113 is connected to the second port of the shallow geothermal hole 1201 .

[0070] In some embodiments, the control module 1300 is also used to control the first valve 1106, the second valve 1107, the fifth valve 1109, the seventh valve 1112 and the eighth valve 1113 to be opened, and control the third valve 1108, the fourth valve 1109 and the sixth valve 1111 to be closed at the initial stage of heating, and use the primary plate heat exchanger 1103 to enable the heating and cooling terminal 2000 to provide heating services, use the secondary plate heat exchanger 1104 to exchange heat between geothermal water from the primary plate heat exchanger 1103 and circulating water from the heating and cooling terminal 2000, and use the shallow geothermal hole 1201 to exchange heat between the circulating water after heat exchange through the secondary plate heat exchanger 1104 and the soil to store heat.

[0071] It should be noted that in actual application scenarios, each port of the equipment in the medium-deep geothermal subsystem and the shallow geothermal subsystem is installed with a valve for controlling the circulation of circulating water, so as to facilitate maintenance and precise control of the equipment. Optionally, in some embodiments, the port where the primary plate heat exchanger is connected to the heating and cooling terminal is installed with a valve for controlling the circulation of circulating water; each port of the medium-deep geothermal heat pump unit is installed with a valve for controlling the circulation of circulating water; each port of the shallow geothermal heat pump unit is installed with a valve for controlling the circulation of circulating water. For example, Figure 4 As shown, in Figure 3 On the basis of the above, the mid-deep geothermal subsystem in the geothermal heating and cooling system provided by the embodiment of the present disclosure also includes: a ninth valve 1114, a tenth valve 1115, an eleventh valve 1116, a twelfth valve 1117, a thirteenth valve 1118, and a fourteenth valve 1119.

[0072] The first port of the ninth valve 1114 is connected to the third port of the primary plate heat exchanger 1103 , and the second port of the ninth valve 1114 is connected to the first port of the heating and cooling terminal 2000 .

[0073] The first port of the tenth valve 1115 is connected to the fourth port of the primary plate heat exchanger 1103 , and the second port of the tenth valve 1115 is connected to the second port of the heating and cooling terminal 2000 .

[0074] The first port of the eleventh valve 1116 is connected to the third port of the secondary plate heat exchanger 1104 and the first port of the seventh valve 1112 , and the second port of the eleventh valve 1116 is connected to the first port of the medium-deep geothermal heat pump unit 1105 .

[0075] The first port of the twelfth valve 1117 is connected to the fourth port of the secondary plate heat exchanger 1105 and the first port of the eighth valve 1113 , and the second port of the twelfth valve 1117 is connected to the second port of the medium-deep geothermal heat pump unit 1105 .

[0076] The first port of the thirteenth valve 1118 is connected to the second port of the ninth valve 1114 and the first port of the heating and cooling terminal 2000 , and the second port of the thirteenth valve 1118 is connected to the third port of the medium-deep geothermal heat pump unit 1105 .

[0077] The first port of the fourteenth valve 1119 is connected to the second port of the tenth valve 1115 and the second port of the heating and cooling terminal 2000 , and the second port of the fourteenth valve 1119 is connected to the fourth port of the medium-deep geothermal heat pump unit 1105 .

[0078] In some embodiments, the shallow geothermal subsystem in the geothermal heating and cooling system provided by the embodiments of the present disclosure further includes: a fifteenth valve 1203 , a sixteenth valve 1204 , a seventeenth valve 1205 , and an eighteenth valve 1206 .

[0079] Among them, the first port of the fifteenth valve 1203 is connected to the first port of the shallow geothermal hole 1201 and the second port of the seventh valve 1112 , and the second port of the fifteenth valve 1203 is connected to the first port of the shallow geothermal heat pump unit 1202 .

[0080] The first port of the sixteenth valve 1204 is connected to the second port of the shallow geothermal hole 1201 and the second port of the eighth valve 1113 , and the second port of the sixteenth valve 1204 is connected to the second port of the shallow geothermal heat pump unit 1202 .

[0081] The first port of the seventeenth valve 1205 is connected to the second port of the ninth valve 1114 , the first port of the thirteenth valve 1118 and the first port of the heating and cooling terminal 2000 , and the second port of the seventeenth valve 1205 is connected to the third port of the shallow geothermal heat pump unit 1202 .

[0082] The first port of the eighteenth valve 1206 is connected to the second port of the tenth valve 1115 , the first port of the fourteenth valve 1119 and the second port of the heating and cooling terminal 2000 , and the second port of the eighteenth valve 1206 is connected to the fourth port of the shallow geothermal heat pump unit 1202 .

[0083] Optionally, in some embodiments, the control module 1300 is specifically configured to control the first valve 1106, the second valve 1107, the fifth valve 1110, the seventh valve 1112, the eighth valve 1113, the ninth valve 1114, and the tenth valve 1115 to be open, and control the third valve 1108, the fourth valve 1109, the sixth valve 1111, the eleventh valve 1116, the twelfth valve 1117, the thirteenth valve 1118, the fourteenth valve 1119, the fifteenth valve 1203, the sixteenth valve 1204, the seventeenth valve 1205, and the eighteenth valve 1206 to be closed at the initial stage of heating. The primary plate heat exchanger 1103 is used to exchange heat between the geothermal water from the mining well 1101 and the circulating water from the heating and cooling terminal 2000, so that the heating and cooling terminal 2000 provides heating services using the circulating water after heat exchange through the primary plate heat exchanger 1103. The secondary plate heat exchanger 1104 is controlled to exchange heat between the geothermal water from the primary plate heat exchanger 1103 and the circulating water from the heating and cooling terminal 2000. The shallow geothermal well 1201 is controlled to exchange heat between the circulating water after heat exchange through the secondary plate heat exchanger 1104 and the soil of the shallow geothermal well 1201 to store heat.

[0084] Optionally, in some embodiments, the control module 1300 is specifically configured to control the first valve 1106, the second valve 1107, the fifth valve 1110, the ninth valve 1114, the tenth valve 1115, the eleventh valve 1116, the twelfth valve 1117, the thirteenth valve 1118, and the fourteenth valve 1119 to be open, and control the third valve 1108, the fourth valve 1109, the sixth valve 1111, the seventh valve 1112, the eighth valve 1113, the fifteenth valve 1203, the sixteenth valve 1204, the seventeenth valve 1205, and the eighteenth valve 1206 to be closed, in the middle of the heating period. The plate heat exchanger 1103 exchanges heat between the geothermal water from the mining well 1101 and the circulating water from the heating and cooling terminal 2000, controls the secondary plate heat exchanger 1104 to exchange heat between the geothermal water from the primary plate heat exchanger 1103 and the circulating water from the heating and cooling terminal 2000, and controls the medium-deep geothermal heat pump unit 1105 to change the temperature of the circulating water after heat exchange through the secondary plate heat exchanger 1104, so that the heating and cooling terminal 2000 uses the circulating water after heat exchange through the primary plate heat exchanger 1103 and the circulating water after temperature change through the medium-deep geothermal heat pump unit 1105 to provide heating services.

[0085] Optionally, in some embodiments, the control module 1300 is specifically used to control the first valve 1106, the second valve 1107, the fifth valve 1110, the ninth valve 1114, the tenth valve 1115, the eleventh valve 1116, the twelfth valve 1117, the thirteenth valve 1118, the fourteenth valve 1119, the fifteenth valve 1203, the sixteenth valve 1204, the seventeenth valve 1205 and the eighteenth valve 1206 to be opened, and the third valve 1108, the fourth valve 1109, the sixth valve 1111, the seventh valve 1112 and the eighth valve 1113 to be closed, and to control the primary plate heat exchanger 1103 to exchange heat between the geothermal water from the mining well and the circulating water from the heating and cooling terminal 2000, and to control the secondary plate heat exchanger 1104 to exchange heat between the geothermal water from the mining well and the circulating water from the heating and cooling terminal 2000. The geothermal water of the primary plate heat exchanger 1103 exchanges heat with the circulating water from the heating and cooling terminal 2000, controls the medium-deep geothermal heat pump unit 1105 to change the temperature of the circulating water after heat exchange through the secondary plate heat exchanger 1104, controls the shallow geothermal well 1201 to exchange heat between the circulating water from the heating and cooling terminal 2000 and the soil, controls the shallow soil source heat pump unit 1202 to change the temperature of the circulating water after heat exchange through the shallow geothermal well 1201, and the circulating water after temperature change treatment flows into the heating and cooling terminal 2000, so that the heating and cooling terminal 2000 uses the circulating water after heat exchange through the primary plate heat exchanger 1103, the circulating water after temperature change through the medium-deep geothermal heat pump unit 1105, and the circulating water after temperature change through the shallow soil source heat pump unit 1202 to provide heating services.

[0086] Optionally, in some embodiments, the control module 1300 is specifically configured to control the third valve 1108, the fourth valve 1109, the sixth valve 1111, the seventh valve 1112, the eighth valve 1113, the eleventh valve 1116, the twelfth valve 1117, the thirteenth valve 1118, and the fourteenth valve 1119 to be opened, and control the first valve 1106, the second valve 1107, the fifth valve 1110, the ninth valve 1114, the tenth valve 1115, the fifteenth valve 1203, and the sixteenth valve 1204 to be opened. , the seventeenth valve 1205 and the eighteenth valve 1206 are closed, the secondary plate heat exchanger 1104 is controlled to exchange heat between the geothermal water from the recharge well 1102 and the circulating water from the heating and cooling terminal 2000, and the medium and deep geothermal heat pump unit 1105 is controlled to perform temperature change treatment on the circulating water after heat exchange through the secondary plate heat exchanger 1104, and the circulating water after temperature change treatment flows into the heating and cooling terminal 2000, so that the heating and cooling terminal 2000 uses the circulating water after temperature change through the medium and deep geothermal heat pump unit 1105 to provide cooling services.

[0087] Optionally, in some embodiments, the control module 1300 is specifically used to control the third valve 1108, the fourth valve 1109, the sixth valve 1111, the eleventh valve 1116, the twelfth valve 1117, the thirteenth valve 1118, the fourteenth valve 1119, the fifteenth valve 1203, the sixteenth valve 1204, the seventeenth valve 1205 and the eighteenth valve 1206 to be open, and to control the first valve 1106, the second valve 1107, the fifth valve 1110, the seventh valve 1112, the eighth valve 1113, the ninth valve 1114 and the tenth valve 1115 to be closed, and to control the secondary plate heat exchanger 1104 to receive the geothermal energy from the primary plate heat exchanger 1103. The water exchanges heat with the circulating water from the heating and cooling terminal 2000, controls the medium and deep geothermal heat pump unit 1105 to change the temperature of the circulating water after heat exchange through the secondary plate heat exchanger 1104, controls the shallow geothermal well 1201 to exchange heat between the circulating water from the heating and cooling terminal 2000 and the soil, controls the shallow soil source heat pump unit 1202 to change the temperature of the circulating water after heat exchange through the shallow geothermal well 1201, and the circulating water after temperature change treatment flows into the heating and cooling terminal 2000, so that the heating and cooling terminal 2000 uses the circulating water after temperature change through the medium and deep geothermal heat pump unit 1105 and the circulating water after temperature change through the shallow soil source heat pump unit 1202 to provide cooling services.

[0088] Figure 5 This is a flow chart of a control method for a geothermal heating and cooling system according to an embodiment of the present disclosure. It should be noted that the structure and function of the geothermal heating and cooling system can be referred to as described above. Figures 1 to 4 The structure and function of the geothermal heating and cooling system described in any of the embodiments shown will not be repeated here.

[0089] In some embodiments, the control method of the geothermal heating and cooling system is performed by a control module in the geothermal heating and cooling system. Figure 5 As shown, the control method of the geothermal heating and cooling system includes but is not limited to the following steps:

[0090] In step S501, first-stage information of a geothermal heating and cooling system is obtained.

[0091] It should be noted that, in some embodiments, the geothermal heating and cooling system can be used to provide heating services or cooling services to the heating and cooling terminal. Optionally, in some embodiments, the first stage information of the geothermal heating and cooling system includes but is not limited to any of the following: heating stage, cooling stage.

[0092] Optionally, in some embodiments, temperature information of the area where the geothermal heating and cooling system is located is obtained; and first-stage information of the geothermal heating and cooling system is determined based on the temperature information and a preset temperature threshold. Exemplarily, the preset temperature threshold includes, but is not limited to, a preset summer temperature threshold; if the temperature information of the area where the geothermal heating and cooling system is located is greater than or equal to the preset summer temperature threshold, the first-stage information of the geothermal heating and cooling system is determined to be the cooling stage.

[0093] It should be noted that, in some embodiments, the heating and cooling load information refers to the heating load information or cooling load information that the heating and cooling terminal needs to bear. The heating load information refers to the amount of heat that the heating and cooling terminal needs to provide during the heating stage. The cooling load information refers to the amount of heat that the heating and cooling terminal needs to take away during the cooling stage. Optionally, in some embodiments, the temperature information of the area where the geothermal heating and cooling system is located and the heating and cooling load information of the heating and cooling terminal are obtained; based on the temperature information and a preset temperature threshold, the intermediate stage information of the geothermal heating and cooling system is determined; the intermediate stage information includes but is not limited to the heating stage information and the cooling stage information; based on the intermediate stage information and the heating and cooling load information, the first stage information of the geothermal heating and cooling system is determined.

[0094] Exemplarily, the intermediate stage information includes but is not limited to heating stage information and cooling stage information; the heating stage information includes but is not limited to the initial stage of heating and the late stage of heating; the cooling stage information includes but is not limited to the initial stage of cooling and the late stage of cooling; the temperature information and the cold and hot load information of the area where the geothermal heating and cooling system is located are obtained; based on the temperature information and the preset temperature threshold, the intermediate stage information of the geothermal heating and cooling system is determined; based on the intermediate stage information and the cold and hot load information, the first stage information of the geothermal heating and cooling system is determined.

[0095] For example, when the intermediate stage information is heating stage information, and the heat load information in the cooling and heating load information is less than the preset heat load threshold, the first stage information of the geothermal heating and cooling system is determined to be the early stage of heating; when the heat load information is greater than or equal to the preset heat load threshold, the first stage information of the geothermal heating and cooling system is determined to be the late stage of heating; or, when the intermediate stage information is cooling stage information, and the cooling load information in the cooling and heating load information is less than the preset cooling load threshold, the first stage information of the geothermal heating and cooling system is determined to be the early stage of cooling; when the cooling load information is greater than or equal to the preset cooling load threshold, the first stage information of the geothermal heating and cooling system is determined to be the late stage of cooling.

[0096] In step S502, based on the first stage information, the mid-deep geothermal subsystem and / or the shallow geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0097] It should be noted that, in some embodiments, the first stage information includes but is not limited to the initial stage of heating, the late stage of heating, the initial stage of cooling, and the late stage of cooling.

[0098] Optionally, in some embodiments, the first stage information also includes but is not limited to the mid-term of heating.

[0099] Optionally, in some embodiments, based on the first stage information, the mid-deep geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0100] Optionally, in some embodiments, based on the first stage information, the mid-deep geothermal subsystem and the shallow geothermal subsystem are controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0101] In an embodiment of the present disclosure, first-stage information of a geothermal heating and cooling system is obtained; based on the first-stage information, the medium-deep geothermal subsystem and / or the shallow geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating services or cooling services. In this way, the medium-deep geothermal wells and the shallow geothermal wells can be combined to meet the heating and cooling needs of the heating and cooling terminal and reduce geothermal heat attenuation while reducing construction costs and risks.

[0102] It should be noted that, in some embodiments, the first stage information includes but is not limited to the initial stage of heating, the middle stage of heating, and the initial stage of cooling. Figure 6 This is a flow chart of a control method for a geothermal heating and cooling system according to an embodiment of the present disclosure. In some embodiments, the execution subject of the control method for a geothermal heating and cooling system is a control module in the geothermal heating and cooling system. Figure 5 As shown, the control method of the geothermal heating and cooling system includes but is not limited to the following steps:

[0103] In step S601, first-stage information of the geothermal heating and cooling system is obtained.

[0104] In the embodiment of the present disclosure, step S601 can be implemented in any of the ways in the embodiments of the present disclosure, which is not limited in the embodiment of the present disclosure and will not be described in detail.

[0105] In step S602, when the first stage information is the initial stage of heating, the middle stage of heating or the initial stage of cooling, the middle and deep geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0106] Optionally, in some embodiments, when the first stage information is the initial stage of heating, the first valve, the second valve, the fifth valve, the seventh valve and the eighth valve are controlled to be opened, and the third valve, the fourth valve and the sixth valve are controlled to be closed, and the first-level plate heat exchanger is used to exchange heat between the geothermal water from the mining well and the circulating water from the heating and cooling terminal, so that the heating and cooling terminal provides heating services using the circulating water after heat exchange through the first-level plate heat exchanger, and the second-level plate heat exchanger is controlled to exchange heat between the geothermal water from the first-level plate heat exchanger and the circulating water from the heating and cooling terminal, and the shallow geothermal well is controlled to exchange heat between the circulating water after heat exchange through the second-level plate heat exchanger and the soil of the shallow geothermal well to store heat.

[0107] Optionally, in some embodiments, when the first-stage information is mid-term heating, the first valve, the second valve, and the fifth valve are controlled to be opened, and the third valve, the fourth valve, the sixth valve, the seventh valve, and the eighth valve are controlled to be closed, the first-level plate heat exchanger is controlled to exchange heat between geothermal water from the mining well and circulating water from the heating and cooling terminal, the second-level plate heat exchanger is controlled to exchange heat between geothermal water from the first-level plate heat exchanger and circulating water from the heating and cooling terminal, and the middle and deep geothermal heat pump unit is controlled to change the temperature of the circulating water after heat exchange through the second-level plate heat exchanger, so that the heating and cooling terminal uses the circulating water after heat exchange through the first-level plate heat exchanger and the circulating water after temperature change through the middle and deep geothermal heat pump unit to provide heating services.

[0108] Optionally, in some embodiments, when the first stage information is the initial stage of cooling, the third valve, the fourth valve, and the sixth valve are controlled to be opened, and the first valve, the second valve, the fifth valve, the seventh valve, and the eighth valve are controlled to be closed, and the secondary plate heat exchanger is controlled to exchange heat between the geothermal water from the recharge well and the circulating water from the heating and cooling terminal, and the medium and deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the secondary plate heat exchanger, and the circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after temperature change through the medium and deep geothermal heat pump unit to provide cooling services.

[0109] In an embodiment of the present disclosure, first-stage information of a geothermal heating and cooling system is obtained; when the first-stage information is the initial stage of heating, the middle stage of heating, or the initial stage of cooling, the middle and deep geothermal subsystems are controlled to enable the heating and cooling terminals to provide heating services or cooling services. In this way, in the initial stage of heating, excess heat of the middle and deep geothermal subsystems is stored in the shallow geothermal subsystem, which can further reduce the operating cost of the geothermal heating and cooling system and the attenuation of geothermal heat.

[0110] Figure 7This is a flow chart of a control method for a geothermal heating and cooling system according to an embodiment of the present disclosure. In some embodiments, the execution subject of the control method for a geothermal heating and cooling system is a control module in the geothermal heating and cooling system. Figure 6 As shown, the control method of the geothermal heating and cooling system includes but is not limited to the following steps:

[0111] In step S701, first-stage information of the geothermal heating and cooling system is obtained.

[0112] In the embodiment of the present disclosure, step S701 can be implemented in any of the ways in the embodiments of the present disclosure, which is not limited in the embodiment of the present disclosure and will not be described in detail.

[0113] In step S702, when the first stage information is the late heating stage or the late cooling stage, the deep geothermal subsystem and the shallow geothermal subsystem are controlled to enable the heating and cooling terminal to provide heating service or cooling service.

[0114] Optionally, in some embodiments, when the first stage information is the late stage of heating, the first valve, the second valve and the fifth valve are controlled to be opened, and the third valve, the fourth valve, the sixth valve, the seventh valve and the eighth valve are controlled to be closed. The first plate heat exchanger is controlled to exchange heat between geothermal water from the extraction well and circulating water from the heating and cooling terminal. The second plate heat exchanger is controlled to exchange heat between geothermal water from the first plate heat exchanger and circulating water from the heating and cooling terminal. The middle and deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the second plate heat exchanger. The shallow geothermal holes are controlled to exchange heat between the circulating water from the heating and cooling terminal and the soil. The shallow soil source heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the shallow geothermal holes. The circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after heat exchange through the first plate heat exchanger, the circulating water after temperature change through the middle and deep geothermal heat pump unit and the circulating water after temperature change through the shallow soil source heat pump unit to provide heating services.

[0115] Optionally, in some embodiments, when the first stage information is the late cooling stage, the third valve, the fourth valve and the sixth valve are controlled to be opened, the first valve, the second valve, the fifth valve, the seventh valve and the eighth valve are controlled to be closed, the secondary plate heat exchanger is controlled to exchange heat between the geothermal water from the primary plate heat exchanger and the circulating water from the heating and cooling terminal, the middle and deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the secondary plate heat exchanger, the shallow geothermal holes are controlled to exchange heat between the circulating water from the heating and cooling terminal and the soil, the shallow soil source heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the shallow geothermal holes, and the circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after temperature change through the middle and deep geothermal heat pump unit and the circulating water after temperature change through the shallow soil source heat pump unit to provide cooling services.

[0116] In the embodiment of the present disclosure, the first-stage information of the geothermal heating and cooling system is obtained; when the first-stage information is the late heating stage or the late cooling stage, the mid-deep geothermal subsystem and the shallow geothermal subsystem are controlled to enable the heating and cooling terminal to provide heating services or cooling services. This can further reduce the operating costs and geothermal heat attenuation of the geothermal heating and cooling system while reducing construction costs and risks.

[0117] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not limited herein.

[0118] The above specific embodiments do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

Claims

1. A geothermal heating and cooling system, characterized in that: include: The medium-deep geothermal subsystem includes: Production wells, used to extract geothermal water from deep underground; Recharge wells, used to store geothermal water in a cooled state; The primary plate heat exchanger is used to exchange heat between the geothermal water from the mining well and the circulating water from the heating and cooling terminal. The geothermal water from the mining well flows into the secondary plate heat exchanger after the heat exchange, and the circulating water from the heating and cooling terminal flows into the heating and cooling terminal after the heat exchange. a secondary plate heat exchanger for performing heat exchange between the geothermal water from the primary plate heat exchanger and the circulating water from the heating and cooling terminal, or for performing heat exchange between the geothermal water from the reinjection well and the circulating water from the heating and cooling terminal, wherein the geothermal water from the primary plate heat exchanger flows into the reinjection well, and the geothermal water from the reinjection well flows into the production well after heat exchange; A mid-deep geothermal heat pump unit is used to perform temperature-changing treatment on the circulating water after heat exchange in the secondary plate heat exchanger, and the circulating water after temperature-changing treatment flows into the heating and cooling terminal; Shallow geothermal subsystem, including: Shallow geothermal holes for exchanging heat between the circulating water after heat exchange in the secondary plate heat exchanger and the soil to store heat, and / or for exchanging heat between the circulating water from the heating and cooling terminal and the soil; A shallow soil source heat pump unit is used to perform temperature-changing treatment on the circulating water after heat exchange through the shallow geothermal holes, and the circulating water after temperature-changing treatment flows into the heating and cooling terminal; A control module is used to control the medium-deep geothermal subsystem and / or the shallow geothermal subsystem so that the heating and cooling terminal provides heating service or cooling service.

2. The system according to claim 1, wherein The control module is specifically used for: At the initial stage of heating, the primary plate heat exchanger is controlled to enable the heating and cooling terminal to provide heating services, and the circulating water after heat exchange through the secondary plate heat exchanger is heat exchanged with the soil of the shallow geothermal well to store heat; or In the middle of heating, controlling the primary plate heat exchanger, the secondary plate heat exchanger and the mid-deep geothermal heat pump unit so that the heating and cooling terminal provides heating service; or, In the later stage of heating, controlling the primary plate heat exchanger, the secondary plate heat exchanger, the mid-deep geothermal heat pump unit, the shallow geothermal well and the shallow soil source heat pump unit so that the heating and cooling terminal provides heating service; or, In the initial stage of cooling, controlling the secondary plate heat exchanger and the mid-deep geothermal heat pump unit to enable the heating and cooling terminal to provide cooling services; or, In the late cooling stage, the secondary plate heat exchanger, the mid-deep geothermal heat pump unit, the shallow geothermal well and the shallow soil source heat pump unit are controlled to enable the heating and cooling terminal to provide cooling services.

3. The system according to claim 1 or 2, characterized in that The mid-deep geothermal subsystem further includes: a first valve, wherein a first port of the first valve is connected to the reinjection well, and a second port of the first valve is connected to the production well and the second port of the secondary plate heat exchanger; a second valve, wherein a first port of the second valve is connected to the production well and a second port of the secondary plate heat exchanger; a third valve, wherein a first port of the third valve is connected to the recharge well and the first port of the first valve; a fourth valve, wherein a first port of the fourth valve is connected to the second port of the third valve, and a second port of the fourth valve is connected to the second port of the second valve; a fifth valve, wherein a first port of the fifth valve is connected to the second port of the second valve and the second port of the fourth valve, and a second port of the fifth valve is connected to the first port of the primary plate heat exchanger; a sixth valve, wherein the first port of the sixth valve is connected to the second port of the second valve, the second port of the fourth valve, and the first port of the fifth valve; and the second port of the sixth valve is connected to the second port of the first-stage plate heat exchanger and the first port of the second-stage plate heat exchanger.

4. The system according to claim 3, wherein: The control module is specifically used for: At the initial stage of heating, the first valve, the second valve, and the fifth valve are controlled to be open, and the third valve, the fourth valve, and the sixth valve are controlled to be closed, and the primary plate heat exchanger is used to enable the heating and cooling terminal to provide heating service; or In the middle of heating, the first valve, the second valve and the fifth valve are controlled to be open, and the third valve, the fourth valve and the sixth valve are controlled to be closed, and the first-stage plate heat exchanger, the second-stage plate heat exchanger and the mid-deep geothermal heat pump unit are used to enable the heating and cooling terminal to provide heating services; or In the later stage of heating, the first valve, the second valve and the fifth valve are controlled to be open, and the third valve, the fourth valve and the sixth valve are controlled to be closed, and the first-stage plate heat exchanger, the second-stage plate heat exchanger, the mid-deep geothermal heat pump unit and the shallow soil source heat pump unit are utilized to enable the heating and cooling terminal to provide heating services; or, At the initial stage of cooling, the third valve, the fourth valve, and the sixth valve are controlled to be open, and the first valve, the second valve, and the fifth valve are controlled to be closed, and the secondary plate heat exchanger and the mid-deep geothermal heat pump unit are used to enable the heating and cooling terminal to provide cooling services; or In the later stage of cooling, the third valve, the fourth valve and the sixth valve are controlled to be open, and the first valve, the second valve and the fifth valve are controlled to be closed, and the secondary plate heat exchanger, the medium-deep geothermal heat pump unit and the shallow soil source heat pump unit are used to enable the heating and cooling terminal to provide cooling services.

5. The system according to claim 3, wherein: The mid-deep geothermal subsystem further includes: a seventh valve, wherein a first port of the seventh valve is connected to the third port of the secondary plate heat exchanger, the second port of the seventh valve, and the first port of the shallow geothermal hole; An eighth valve, wherein a first port of the eighth valve is connected to the fourth port of the secondary plate heat exchanger, a second port of the eighth valve and a second port of the shallow geothermal hole.

6. The system according to claim 5, wherein: The control module is further configured to: At the initial stage of heating, the first valve, the second valve, the fifth valve, the seventh valve and the eighth valve are controlled to be open, and the third valve, the fourth valve and the sixth valve are controlled to be closed. The primary plate heat exchanger is used to enable the heating and cooling terminal to provide heating services. The secondary plate heat exchanger is used to exchange heat between the geothermal water from the primary plate heat exchanger and the circulating water from the heating and cooling terminal. The shallow geothermal holes are used to exchange heat between the circulating water after heat exchange through the secondary plate heat exchanger and the soil to store heat.

7. A control method for a geothermal heating and cooling system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Obtaining first-stage information of the geothermal heating and cooling system; According to the first stage information, the mid-deep geothermal subsystem and / or the shallow geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service.

8. The method according to claim 7, characterized in that The first stage information includes an initial heating period, a mid-heating period, a late heating period, an initial cooling period, and an initial cooling period; and controlling the medium-deep geothermal subsystem and / or the shallow geothermal subsystem based on the first stage information so that the heating and cooling terminal provides a heating service or a cooling service includes: When the first stage information is the initial stage of heating, the middle stage of heating or the initial stage of cooling, the mid-deep geothermal subsystem is controlled to enable the heating and cooling terminal to provide heating service or cooling service; or When the first stage information is the late heating stage or the late cooling stage, the mid-deep geothermal subsystem and the shallow geothermal subsystem are controlled to enable the heating and cooling terminal to provide heating service or cooling service.

9. The method according to claim 8, characterized in that When the first stage information is an initial heating period, a mid-heating period, or an initial cooling period, controlling the mid-deep geothermal subsystem so that the heating and cooling terminal provides a heating service or a cooling service includes any one of the following: When the first stage information indicates the initial stage of heating, the first valve, the second valve, the fifth valve, the seventh valve, and the eighth valve are controlled to be open, and the third valve, the fourth valve, and the sixth valve are controlled to be closed. The first-level plate heat exchanger is used to perform heat exchange between the geothermal water from the extraction well and the circulating water from the heating and cooling terminal, so that the heating and cooling terminal provides heating services using the circulating water after heat exchange through the first-level plate heat exchanger. The second-level plate heat exchanger is controlled to perform heat exchange between the geothermal water from the first-level plate heat exchanger and the circulating water from the heating and cooling terminal. The shallow geothermal well is controlled to perform heat exchange between the circulating water after heat exchange through the second-level plate heat exchanger and the soil of the shallow geothermal well to store heat. When the first-stage information indicates that the heating is in the middle stage, the first valve, the second valve, and the fifth valve are controlled to be opened, and the third valve, the fourth valve, the sixth valve, the seventh valve, and the eighth valve are controlled to be closed. The first-stage plate heat exchanger is controlled to perform heat exchange between the geothermal water from the extraction well and the circulating water from the heating and cooling terminal. The second-stage plate heat exchanger is controlled to perform heat exchange between the geothermal water from the first-stage plate heat exchanger and the circulating water from the heating and cooling terminal. The mid-deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the second-stage plate heat exchanger, so that the heating and cooling terminal uses the circulating water after heat exchange through the first-stage plate heat exchanger and the circulating water after temperature change through the mid-deep geothermal heat pump unit to provide heating services. When the first stage information is the initial stage of cooling, the third valve, the fourth valve, and the sixth valve are controlled to be opened, and the first valve, the second valve, the fifth valve, the seventh valve, and the eighth valve are controlled to be closed. The secondary plate heat exchanger is controlled to exchange heat between the geothermal water from the recharge well and the circulating water from the heating and cooling terminal. The medium-deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the secondary plate heat exchanger. The circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after temperature change through the medium-deep geothermal heat pump unit to provide cooling services.

10. The method according to claim 8, characterized in that When the first stage information indicates the late heating stage or the late cooling stage, controlling the mid-deep geothermal subsystem and the shallow geothermal subsystem so that the heating and cooling terminal provides heating service or cooling service includes any one of the following: When the first stage information is the late heating stage, the first valve, the second valve and the fifth valve are controlled to be opened, the third valve, the fourth valve, the sixth valve, the seventh valve and the eighth valve are controlled to be closed, the first plate heat exchanger is controlled to exchange heat between the geothermal water from the mining well and the circulating water from the heating and cooling terminal, the second plate heat exchanger is controlled to exchange heat between the geothermal water from the first plate heat exchanger and the circulating water from the heating and cooling terminal, and the mid-deep geothermal heat pump unit is controlled to pass through The circulating water after heat exchange in the secondary plate heat exchanger is subjected to temperature change treatment, the shallow geothermal well is controlled to exchange heat between the circulating water from the heating and cooling terminal and the soil, and the shallow soil source heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the shallow geothermal well. The circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after heat exchange through the primary plate heat exchanger, the circulating water after temperature change through the medium-deep geothermal heat pump unit, and the circulating water after temperature change through the shallow soil source heat pump unit to provide heating services; When the first stage information indicates the late cooling stage, the third valve, the fourth valve, and the sixth valve are controlled to be opened, and the first valve, the second valve, the fifth valve, the seventh valve, and the eighth valve are controlled to be closed. The secondary plate heat exchanger is controlled to perform heat exchange between the geothermal water from the primary plate heat exchanger and the circulating water from the heating and cooling terminal. The mid-deep geothermal heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the secondary plate heat exchanger. The shallow geothermal well is controlled to perform heat exchange between the circulating water from the heating and cooling terminal and the soil. The shallow soil source heat pump unit is controlled to perform temperature change treatment on the circulating water after heat exchange through the shallow geothermal well. The circulating water after temperature change treatment flows into the heating and cooling terminal, so that the heating and cooling terminal uses the circulating water after temperature change through the mid-deep geothermal heat pump unit and the circulating water after temperature change through the shallow soil source heat pump unit to provide cooling services.

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