Geothermal energy comprehensive utilization system of middle-deep geothermal well

Abstract

The utility model discloses a geothermal energy comprehensive utilization system of a medium-deep geothermal well, which belongs to the technical field of geothermal energy and comprises a heat exchange system connected with the geothermal well. The power grid is connected with the heat exchange system; the air compressor is connected with the power grid; the power generation device is respectively connected with the air compressor and the power grid; the energy storage device is arranged in the geothermal well, and the energy storage device is connected with the air compressor and the power generation device; by means of the heat exchange system, geothermal energy can be supplied to users for heating in winter, when the geothermal well is idle in summer, the power generation efficiency can be improved through the auxiliary power generation device, and therefore heat energy waste caused by the fact that the geothermal well is idle in summer is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal energy, in particular to a geothermal energy comprehensive utilization system for medium-deep geothermal wells. Background Art

[0002] Geothermal well heating mainly utilizes high-temperature water or steam deep underground. Through drilling technology, geothermal wells are drilled to areas rich in geothermal resources. The high-temperature water or steam underground is then pumped to the ground, and the heat energy is transferred to the heat exchange system through a heat exchanger, thereby increasing the indoor temperature.

[0003] The heat source of geothermal well heating comes from deep underground, with a stable and high temperature, so it has high thermal efficiency. In winter, geothermal wells can provide continuous and stable heat energy to meet indoor heating needs while reducing energy consumption.

[0004] However, geothermal wells are basically not put into use in summer and are idle, resulting in a waste of geothermal energy. Utility Model Content

[0005] In order to solve the problems of the prior art, the utility model provides a geothermal energy comprehensive utilization system of a medium-deep geothermal well, comprising: a heat exchange system, wherein the heat exchange system and the geothermal well are used to transmit geothermal energy to users for heating in winter;

[0006] A power grid connected to the heat exchange system and used to drive the heat exchange system to start;

[0007] An air compressor connected to the power grid and controlled by the power grid to perform an air compression process;

[0008] a power generation device, the power generation device being connected to the air compressor and the power grid respectively, generating electricity by utilizing the air compressed by the air compressor and transmitting the generated electric energy to the power grid;

[0009] An energy storage device is arranged in a geothermal well and is connected to the air compressor and the power generation device respectively. The energy storage device is used to store the air compressed by the air compressor when the power generation device is not working, and to transport the stored high-temperature air to the power generation device when the power generation device is working.

[0010] Furthermore, the geothermal wells include: medium-deep geothermal wells and shallow geothermal wells;

[0011] The medium-deep geothermal well and the shallow geothermal well are both connected to the heat exchange system.

[0012] Furthermore, the heat exchange system includes: a first evaporator, a first condenser, a second evaporator, and a second condenser;

[0013] The first evaporator is connected to the first condenser;

[0014] The first evaporator is connected to the shallow geothermal well pipeline to form a loop, and a valve is installed on the pipeline;

[0015] The first condenser is connected to the user via a pipeline to form a loop, and a shallow geothermal heating circulation pump is installed on the pipeline;

[0016] The second evaporator is connected to the second condenser;

[0017] The second evaporator is connected to the medium-deep geothermal well pipeline to form a loop, and a valve is installed on the pipeline;

[0018] The second condenser is connected to the user through a pipeline to form a loop, and a medium-deep geothermal heating circulation pump is installed on the pipeline.

[0019] Furthermore, the shallow geothermal well is connected to the first input end and the first output end of the water-cooled air cooler through a pipeline, and the pipeline between the water-cooled air cooler and the shallow geothermal well is connected to form a loop, and a shallow geothermal circulation pump and a valve are installed on the pipeline;

[0020] When the shallow geothermal circulation pump is started, the geothermal water in the shallow geothermal well can be fed into the input end of the water-cooled air cooler, and then flows out from the output end of the water-cooled air cooler and returns to the shallow geothermal well along the pipeline;

[0021] The water-cooled air cooler is connected to the second input end of the air compressor, and the second output end of the water-cooled air cooler is connected to the power generation device for sending the heated compressed air into the power generation device.

[0022] Furthermore, the power generation device includes: a turbine expander and a generator;

[0023] The input end of the turbo expander is connected to the second output end of the water-cooled air cooler, the output end of the turbo expander is connected to the generator, and the generator is also connected to the power grid;

[0024] The input end of the turbo expander is also connected to the energy storage device;

[0025] The air compressor and the generator are located on one side of the shallow geothermal well, and the turbine expander and the generator are located on one side of the medium-deep geothermal well.

[0026] Furthermore, the energy storage device comprises: an energy storage box and a heat-insulating shell;

[0027] The heat-insulating shell is arranged outside the energy storage box, a distance is left between the heat-insulating shell and the energy storage box, and a phase change material is arranged between the distances;

[0028] The energy storage box is connected to the output end pipeline of the air compressor, and the energy storage box is connected to the input end pipeline of the turbine expander, and both pipelines are provided with valves and power pumps.

[0029] Beneficial effects of the utility model:

[0030] The heat exchange system can provide geothermal energy for heating users in winter. In summer, when the geothermal wells are idle, the medium required by the power generation device can be insulated and heated, thereby assisting the power generation device to improve power generation efficiency, thus avoiding the waste of heat energy caused by the idle geothermal wells in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the system framework provided by the utility model.

[0033] Figure numerals: 1 is the power grid, 2 is the medium-deep geothermal well, 3 is the shallow geothermal well, 4 is the first evaporator, 5 is the first condenser, 6 is the second evaporator, 7 is the second condenser, 8 is the water-cooled air cooler, 9 is the air compressor, 10 is the generator, 11 is the turbine expander, 12 is the generator, and 13 is the user. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1 , a geothermal energy comprehensive utilization system of a medium-deep geothermal well, comprising: a heat exchange system, wherein the heat exchange system and the geothermal well are used to transmit geothermal energy to users for heating in winter;

[0036] Power grid 1, which is connected to the heat exchange system and is used to drive the heat exchange system to start;

[0037] An air compressor 9, wherein the air compressor 9 is connected to the power grid 1 and is controlled by the power grid 1 to perform an air compression process;

[0038] a power generation device, the power generation device being connected to the air compressor and the power grid 1 respectively, generating electricity by utilizing the air compressed by the air compressor, and transmitting the generated electric energy to the power grid 1;

[0039] An energy storage device is provided in a geothermal well and is connected to the air compressor 9 and the power generation device, respectively, and is used to store the air compressed by the air compressor 9 when the power generation device is not working, and to deliver the stored high-temperature air to the power generation device when the power generation device is working.

[0040] Among them, the main utility model point of this application is that in winter, geothermal energy is delivered to users for heating through a heat exchange system. In the idle time in summer, the air compressed by the geothermal energy well air compressor is heated up and then sent to the power generation device for power generation, thereby improving the power generation efficiency and avoiding the problem of geothermal wells being idle in the summer.

[0041] In some embodiments, the geothermal wells include: a medium-deep geothermal well 2 and a shallow geothermal well 3;

[0042] The medium-deep geothermal well 2 and the shallow geothermal well 3 are both connected to the heat exchange system.

[0043] In some embodiments, the heat exchange system includes: a first evaporator 4, a first condenser 5, a second evaporator 6, and a second condenser 7;

[0044] The first evaporator 4 is connected to the first condenser 5;

[0045] The first evaporator 4 is connected to the shallow geothermal well 3 through a pipeline to form a loop, and a valve is installed on the pipeline;

[0046] The first condenser 5 is connected to the user 13 via a pipeline to form a loop, and a shallow geothermal heating circulation pump is installed on the pipeline;

[0047] The second evaporator 6 is connected to the second condenser 7;

[0048] The second evaporator 6 is connected to the medium-deep geothermal well 2 through a pipeline to form a loop, and a valve is installed on the pipeline;

[0049] The second condenser 7 is connected to the user 13 via a pipeline to form a loop, and a mid-deep geothermal heating circulation pump is installed on the pipeline.

[0050] Among them, there are two evaporators and two condensers, whose main function is to participate in the heat exchange process for shallow geothermal wells and medium-deep geothermal wells when providing heating to users, so that when a fault occurs, it can be quickly checked, and any type of geothermal well can be selectively used for heating.

[0051] In some embodiments, the shallow geothermal well 3 is connected to the first input end and the first output end of the water-cooled air cooler 8 through a pipeline. The pipeline between the water-cooled air cooler 8 and the shallow geothermal well 3 is connected to form a loop, and a shallow geothermal circulation pump and a valve are installed on the pipeline;

[0052] When the shallow geothermal circulation pump is started, the geothermal water in the shallow geothermal well 3 can be fed into the input end of the water-cooled air cooler 8, and then flows out from the output end of the water-cooled air cooler 8 and returns to the shallow geothermal well 3 along the pipeline;

[0053] The water-cooled air cooler 8 is connected to the second input end of the air compressor 9, and the second output end of the water-cooled air cooler 8 is connected to the power generation device for sending the heated compressed air into the power generation device.

[0054] The power generation device includes: a turbine expander 11 and a generator 12;

[0055] The input end of the turbo expander 11 is connected to the second output end of the water-cooled air cooler 8, and the output end of the turbo expander 11 is connected to the generator 12, and the generator 12 is also connected to the power grid 1;

[0056] The input end of the turbo expander 11 is also connected to the energy storage device;

[0057] The air compressor 9 and the generator 12 are located on one side of the shallow geothermal well 3 , and the turbine expander 11 and the generator 12 are located on one side of the medium-deep geothermal well 2 .

[0058] Among them, the function of the air compressor 9 is to compress the air so that the air has a certain pressure. After the air is compressed by the air compressor 9, it enters the water-cooled air cooler 8, and the geothermal circulation pump transports the geothermal water in the shallow geothermal well 3 to the water-cooled air cooler 8. At this time, the compressed air and the geothermal water undergo heat exchange in the water-cooled air cooler, so that the compressed air has a certain temperature (equivalent to steam), and then is sent along the pipeline to the turbine expander 11 for power generation.

[0059] The air compressor 9 can be started not only by the power grid 1 but also by solar energy, wind energy, etc. When the power grid 1 starts the air compressor 9, it is started at night because the electricity price is lower at night. When the generator 12 is not working, the air compressor 9 is started and the compressed air is stored in the energy storage device as a backup.

[0060] The energy storage device includes: an energy storage box and a thermal insulation shell;

[0061] The heat-insulating shell is arranged outside the energy storage box, and a gap is left between the heat-insulating shell and the energy storage box. A phase change material is arranged between the gap to keep the compressed air warm. When the power generation process needs to be started, the stored compressed air can be delivered to the power generation device;

[0062] The energy storage tank is connected to the output end pipeline of the air compressor 9, and the energy storage tank is connected to the input end pipeline of the turbine expander 11, and both pipelines are provided with valves and power pumps.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A geothermal energy comprehensive utilization system for medium-deep geothermal wells, characterized in that: include: A heat exchange system, wherein the heat exchange system and the geothermal well are used to transmit geothermal energy to users for heating in winter; A power grid connected to the heat exchange system and used to drive the heat exchange system to start; An air compressor connected to the power grid and controlled by the power grid to perform an air compression process; a power generation device, the power generation device being connected to the air compressor and the power grid respectively, generating electricity by utilizing the air compressed by the air compressor and transmitting the generated electric energy to the power grid; An energy storage device is arranged in a geothermal well and is connected to the air compressor and the power generation device respectively. The energy storage device is used to store the air compressed by the air compressor when the power generation device is not working, and to transport the stored high-temperature air to the power generation device when the power generation device is working.

2. The geothermal energy comprehensive utilization system of a medium-deep geothermal well according to claim 1, characterized in that: The geothermal wells include: medium-deep geothermal wells and shallow geothermal wells; The medium-deep geothermal well and the shallow geothermal well are both connected to the heat exchange system.

3. The geothermal energy comprehensive utilization system of a medium-deep geothermal well according to claim 2, characterized in that: The heat exchange system includes: a first evaporator, a first condenser, a second evaporator, and a second condenser; The first evaporator is connected to the first condenser; The first evaporator is connected to the shallow geothermal well pipeline to form a loop, and a valve is installed on the pipeline; The first condenser is connected to the user via a pipeline to form a loop, and a shallow geothermal heating circulation pump is installed on the pipeline; The second evaporator is connected to the second condenser; The second evaporator is connected to the medium-deep geothermal well pipeline to form a loop, and a valve is installed on the pipeline; The second condenser is connected to the user through a pipeline to form a loop, and a medium-deep geothermal heating circulation pump is installed on the pipeline.

4. The geothermal energy comprehensive utilization system of a medium-deep geothermal well according to claim 2, characterized in that: The shallow geothermal well is connected to the first input end and the first output end of the water-cooled air cooler through a pipeline. The pipeline between the water-cooled air cooler and the shallow geothermal well is connected to form a loop, and a shallow geothermal circulation pump and a valve are installed on the pipeline; When the shallow geothermal circulation pump is started, the geothermal water in the shallow geothermal well can be fed into the input end of the water-cooled air cooler, and then flows out from the output end of the water-cooled air cooler and returns to the shallow geothermal well along the pipeline; The water-cooled air cooler is connected to the second input end of the air compressor, and the second output end of the water-cooled air cooler is connected to the power generation device for sending the heated compressed air into the power generation device.

5. The geothermal energy comprehensive utilization system of a medium-deep geothermal well according to claim 4, characterized in that: The power generation device includes: a turbine expander and a generator; The input end of the turbo expander is connected to the second output end of the water-cooled air cooler, the output end of the turbo expander is connected to the generator, and the generator is also connected to the power grid; The input end of the turbo expander is also connected to the energy storage device; The air compressor and the generator are located on one side of the shallow geothermal well, and the turbine expander and the generator are located on one side of the medium-deep geothermal well.

6. The geothermal energy comprehensive utilization system of a medium-deep geothermal well according to claim 5, characterized in that: The energy storage device comprises: an energy storage box and a heat-insulating shell; The heat-insulating shell is arranged outside the energy storage box, a distance is left between the heat-insulating shell and the energy storage box, and a phase change material is arranged between the distances; The energy storage box is connected to the output end pipeline of the air compressor, and the energy storage box is connected to the input end pipeline of the turbine expander, and both pipelines are provided with valves and power pumps.

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