A medium-deep geothermal zero-carbon heating system based on carbon dioxide recovery

Abstract

The utility model discloses a medium-deep geothermal zero-carbon heating system based on carbon dioxide recovery, comprising: a medium-deep geothermal system, a heat exchange part is arranged within 2000-3000m underground; a gas boiler system; a carbon dioxide recovery system, the inlet end of which is correspondingly connected to the tail gas outlet of the gas boiler system; a heating circulating water system, the hot water inlet end is respectively connected to the hot water supply end of the medium-deep geothermal system and the gas boiler system, the hot water outlet end is connected to the terminal heat dissipation equipment in the agricultural facility, and the cold water return pipeline connects the outlet of the terminal heat dissipation equipment to the medium-deep geothermal system and the return end of the gas boiler system; wherein the carbon dioxide recovery system comprises: a fume tank, the air inlet end is connected to the tail gas outlet of the gas boiler body of the gas boiler system; a gas separation device, the inlet end of which is connected to the air outlet of the fume tank.

Description

Technical Field

[0001] This utility model relates to the field of modern facility agriculture technology, and in particular to a medium-deep geothermal zero-carbon heating system based on carbon dioxide recovery. Background Technology

[0002] Modern facility agriculture utilizes artificial technologies to alter natural light and temperature conditions, creating optimized environmental factors for plant and animal growth, enabling them to thrive in all weather conditions. In northern regions, winter temperatures are too low to meet crop growth requirements, and atmospheric carbon dioxide concentrations are far from sufficient for high-quality, high-yield crops. Therefore, northern regions have begun experimenting with combining geothermal technology with gas-fired boilers to serve modern facility agriculture, providing heat sources to agricultural facilities and creating a complementary advantage. However, the flue gas from gas-fired equipment contains greenhouse gases such as carbon dioxide. Direct emission of these gases results in energy waste and contributes to the greenhouse effect. If carbon dioxide could be recovered and reused in crop growth processes to meet photosynthetic needs, achieving carbon dioxide fertilization, the results would be significantly more efficient. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a zero-carbon heating system for medium-deep geothermal reservoirs based on carbon dioxide recovery.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A medium-deep geothermal zero-carbon heating system based on carbon dioxide recovery includes:

[0006] The heat exchange section of the medium-deep geothermal system is located 2000-3000m underground;

[0007] Gas-fired boiler system;

[0008] The carbon dioxide recovery system is connected at its inlet to the exhaust outlet of the gas boiler system.

[0009] The heating circulating water system has its hot water inlet connected to the hot water supply end of the medium-deep geothermal system and the gas boiler system, respectively, and its hot water outlet connected to the terminal heat dissipation equipment in agricultural facilities. The cold water return pipeline connects the outlet of the terminal heat dissipation equipment to the return water end of the medium-deep geothermal system and the gas boiler system, respectively.

[0010] The carbon dioxide recovery system includes:

[0011] The flue gas canister has its inlet connected to the exhaust outlet of the gas boiler body in the gas boiler system.

[0012] The gas separation device has its inlet end connected to the gas outlet of the flue gas tank.

[0013] The carbon dioxide absorption tower is connected to the outlet of the gas separation device at its inlet end. A regeneration tower is also connected to the carbon dioxide absorption tower for circulating carbon dioxide absorption. When the carbon dioxide absorption tower reaches saturation, the carbon dioxide enters the regeneration tower for further treatment.

[0014] The carbon dioxide storage tank has its inlet connected to the outlet of a carbon dioxide absorption tower, and its outlet connected to agricultural facilities to supply them with carbon dioxide.

[0015] This utility model also includes:

[0016] An electrostatic precipitator is installed at the outlet end of the gas separation device.

[0017] The medium-deep geothermal system includes:

[0018] Medium-deep rock heat exchange holes are set up at a depth of 2000-3000m underground;

[0019] The cold water supply port of the medium-deep geothermal unit is connected to the cold water inlet of the medium-deep geothermal heat exchange hole through the circulating pump on the heat source side of the medium-deep geothermal unit, and the hot water outlet of the medium-deep geothermal heat exchange hole is connected to the hot water inlet of the medium-deep geothermal unit.

[0020] The heating circulating water system includes:

[0021] The user-side water collector has hot water inlets connected to the hot water supply outlets of the medium-deep geothermal unit and the gas boiler body, respectively, and hot water outlets connected to the inlets of the terminal heat dissipation equipment.

[0022] The user-side water distributor has its return water inlet connected to the outlet of the terminal heat dissipation equipment via the user-side heating circulation pump, and its delivery water inlet connected to the return water inlets of the medium-deep geothermal unit and the gas boiler body, respectively.

[0023] This utility model also includes a water replenishment and supply system;

[0024] The water replenishment and supply system includes:

[0025] The water tank's water supply outlet is connected to the gas boiler's return water inlet, the user-side constant pressure water supply pump, the medium-deep geothermal heat source-side constant pressure water supply pump, and the seedling and fertilizer supply pump, respectively, and to the user-side cold water inlet of the user-side water collector, the medium-deep geothermal heat exchange hole, and the water-using end of the agricultural facility.

[0026] The carbon dioxide recovery system also includes:

[0027] The flue gas waste heat recovery heat exchanger is installed at the inlet end of the carbon dioxide absorption tower;

[0028] The cold water inlet of the flue gas waste heat recovery heat exchanger is connected to the cold water outlet of the water tank, and the hot water outlet of the flue gas waste heat recovery heat exchanger is connected to the return water outlet of the water tank through a water pump.

[0029] The water tank is equipped with an RO water purification system.

[0030] This utility model also includes: an automatic control system;

[0031] The automatic control system includes:

[0032] The automatic controller's signal receiver is connected via signal lines to the operating parameter detection sensors on the medium-deep geothermal unit, the medium-deep geothermal heat source-side circulation pump, the gas boiler body, the flue gas tank, the gas separation device, the electrostatic precipitator, the flue gas waste heat recovery heat exchanger, the carbon dioxide absorption tower, the regeneration tower, the carbon dioxide storage tank, the user-side heating circulation pump, the user-side water distributor, the RO water purification equipment, the water tank, the gas boiler constant pressure water supply pump, the user-side constant pressure water supply pump, the medium-deep geothermal heat source-side constant pressure water supply pump, and the seedling topdressing water supply pump.

[0033] The beneficial effects of this utility model are:

[0034] 1. Energy-saving, environmentally friendly, and green carbon reduction

[0035] The system described in this invention utilizes medium-deep geothermal energy, a clean and renewable energy source, representing a completely green and low-carbon energy supply method. The flue gas produced by the gas-fired boiler combustion is used to heat the water in the RO system's water tank after passing through a waste heat recovery heat exchanger. This water can be used for system makeup water and fertilizer supply, resulting in significant energy-saving benefits.

[0036] Carbon dioxide recovery systems can recover carbon dioxide from combustion flue gas and use it for plant photosynthesis in facility agriculture. This is a green and carbon-negative heating method with high energy efficiency and low operating costs, and it has good application prospects in the context of "carbon peaking and carbon neutrality".

[0037] 2. Multi-functional complementarity, stable and reliable

[0038] In the regional energy supply system described in this utility model, the medium-deep geothermal layer provides the basic heat source for facility agriculture throughout the year, while the gas boiler system serves as an emergency and peak-shaving heat source, ensuring the heat demand of facility agriculture when extreme weather occurs or rapid heating is required, thus achieving the reliability and stability of energy supply.

[0039] 3. High degree of intelligent control and automation

[0040] The entire system utilizes industrial automatic control technology and Internet technology to achieve automatic operation and remote control, enabling unattended and automatic operation. This makes the system easy to operate and simple to use, and allows for precise and refined energy management, thereby maximizing energy savings. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the present invention.

[0042] The components include: 1. Agricultural facilities; 2. Medium-deep geothermal heat exchange holes; 3. Medium-deep geothermal units; 4. Medium-deep geothermal heat source-side circulation pump; 5. Gas boiler body; 6. Flue gas tank; 7. Gas separation device; 8. Electrostatic precipitator; 9. Flue gas waste heat recovery heat exchanger; 10. Carbon dioxide absorption tower; 11. Regeneration tower; 12. Carbon dioxide storage tank; 13. User-side heating circulation pump; 14. User-side water distributor; 15. User-side water collector; 16. RO water purification equipment; 17. Water tank; 18. Gas boiler constant pressure water supply pump; 19. User-side constant pressure water supply pump; 20. Medium-deep geothermal heat source-side constant pressure water supply pump; 21. Seedling and topdressing water supply pump; 22. Automatic control system; 23. Heat dissipation facilities; 24. Water pump. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0044] like Figure 1As shown, a zero-carbon heating system based on carbon dioxide recovery in medium-deep geothermal energy includes: a medium-deep geothermal system, with the heat exchange section located at a depth of 2000-3000m underground; a gas-fired boiler system; a carbon dioxide recovery system, with its inlet connected to the exhaust outlet of the gas-fired boiler system; and a heating circulating water system, with its hot water inlet connected to the hot water supply outlets of both the medium-deep geothermal system and the gas-fired boiler system, its hot water outlet connected to the terminal heat dissipation device 23 in agricultural facility 1, and its cold water return pipeline connecting the outlet of the terminal heat dissipation device 23 to the return water outlets of both the medium-deep geothermal system and the gas-fired boiler system; wherein, the... The carbon dioxide recovery system includes: a flue gas tank 6, the inlet of which is connected to the exhaust outlet of the gas boiler body 5 of the gas boiler system; a gas separator 7, the inlet of which is connected to the outlet of the flue gas tank 6; a carbon dioxide absorption tower 10, the inlet of which is connected to the outlet of the gas separator 7, and a regeneration tower 11 is also connected to the carbon dioxide absorption tower 10 for circulating absorption of carbon dioxide. When the carbon dioxide absorption tower 10 reaches saturation, the carbon dioxide enters the regeneration tower 11 for processing; and a carbon dioxide storage tank 12, the inlet of which is connected to the outlet of the carbon dioxide absorption tower 10, and the outlet of which is connected to the agricultural facility 1 for supplying carbon dioxide to it.

[0045] like Figure 1 As shown, the present invention also includes an electrostatic precipitator 8, which is installed at the outlet end of the gas separation device 7.

[0046] like Figure 1 As shown, the medium-deep geothermal system includes: a medium-deep geothermal heat exchange hole 2, located at a depth of 2000-3000m underground; and a medium-deep geothermal unit 3, wherein the cold water supply port is connected to the cold water inlet of the medium-deep geothermal heat exchange hole 2 via a circulation pump 4 on the heat source side of the medium-deep geothermal system, and the hot water outlet of the medium-deep geothermal heat exchange hole 2 is connected to the hot water inlet of the medium-deep geothermal unit 3.

[0047] like Figure 1 As shown, the heating circulating water system includes: a user-side water collector 15, with hot water inlets connected to the hot water supply outlets of the medium-deep geothermal unit 3 and the gas boiler body 5 respectively, and a hot water outlet connected to the inlet of the terminal heat dissipation device 23; and a user-side water distributor 14, with the return water outlet connected to the outlet of the terminal heat dissipation device 23 via the user-side heating circulating pump 13, and the water supply outlet connected to the return water outlets of the medium-deep geothermal unit 3 and the gas boiler body 5 respectively.

[0048] like Figure 1As shown, this utility model also includes a water replenishment and supply system; the water replenishment and supply system includes: a water tank 17, whose water replenishment outlet is connected to the return water inlet of the gas boiler body 5, the hot water inlet of the user-side water collector 15, the cold water inlet of the medium-deep rock heat exchange hole 2, and the water-using end of the agricultural facility 1 through a gas boiler constant pressure water replenishment pump 18, a user-side constant pressure water replenishment pump 19, a medium-deep rock heat exchange hole 2, and a seedling topdressing water supply pump 21, respectively.

[0049] like Figure 1 As shown, the carbon dioxide recovery system also includes: a flue gas waste heat recovery heat exchanger 9, which is installed at the inlet end of the carbon dioxide absorption tower 10; wherein, the cold water inlet of the flue gas waste heat recovery heat exchanger 9 is connected to the cold water outlet of the water tank 17, and the hot water outlet of the flue gas waste heat recovery heat exchanger 9 is connected to the return water outlet of the water tank 17 through a water pump 24.

[0050] like Figure 1 As shown, an RO water purification device 16 is installed on the water tank 17.

[0051] like Figure 1 As shown, this utility model also includes: an automatic control system 22; the automatic control system 22 includes: an automatic controller, whose signal receiving end is connected via a signal line to the working parameter detection sensors on the medium-deep geothermal unit 4, the medium-deep geothermal heat source side circulation pump 4, the gas boiler body 5, the flue gas tank 6, the gas separation device 7, the electrostatic precipitator 8, the flue gas waste heat recovery heat exchanger 9, the carbon dioxide absorption tower 10, the regeneration tower 11, the carbon dioxide storage tank 12, the user-side heating circulation pump 13, the user-side water distributor 14, the RO water purification equipment 16, the water tank 17, the gas boiler constant pressure water supply pump 18, the user-side constant pressure water supply pump 19, the medium-deep geothermal heat source side constant pressure water supply pump 20, and the seedling topdressing water supply pump 21.

[0052] When this utility model is in use, the RO water purification equipment 16 first starts working, and the produced RO water is loaded into the water tank 17. The RO water is then supplied to the user-side constant pressure water supply pump 19 and the medium-deep rock heat source side constant pressure water supply pump 20, respectively, so that they can all work normally.

[0053] During the spring, autumn, or early winter heating season, the multi-span greenhouses of facility agriculture make full use of solar energy to supplement the required heat during the day. At night, when the temperature is low, the automatic control system 22 automatically turns on the medium-deep geothermal unit 3 and the medium-deep geothermal heat source side circulation pump 4 to heat the agricultural facilities 1, ensuring the heat demand of the modern facility agriculture multi-span greenhouse. Specifically, the circulating pump 4 on the heat source side of the medium-deep geothermal unit 3 pumps cold water from the medium-deep geothermal unit 3 into the medium-deep geothermal heat exchange hole 2. After heat exchange between the medium-deep geothermal heat exchange hole 2 and the geothermal energy, the cold water becomes hot water and returns to the medium-deep geothermal unit 3. When in use, the user-side water collector 15 sends the hot water from the medium-deep geothermal unit 3 to the terminal heat dissipation device 23 to meet the heat demand of the agricultural facility 1. After heat dissipation, the user-side heating circulation pump 13 pumps the cold water back to the user-side water distributor 14 and finally back to the medium-deep geothermal unit 3, repeating the cycle.

[0054] When the multi-span greenhouse for agricultural facilities is in deep winter or during extreme weather, and the medium-deep geothermal system alone cannot meet the heat demand of agricultural facility 1, the automatic control system 22 replenishes water to the gas boiler system via the gas boiler constant pressure water pump 18, enabling it to operate normally and controlling the gas boiler system to start up, coupling with the medium-deep geothermal system for heating, in order to cope with unnecessary losses to agricultural facility 1 caused by extreme weather. At the same time, the flue gas tank 6 collects and recovers the carbon dioxide generated by the gas boiler body 5, which is used for the photosynthesis of crops in the multi-span greenhouse for agricultural facilities, resulting in significant emission reduction and achieving zero emissions.

[0055] The flue gas generated by the combustion of the gas-fired boiler body 5 is temporarily stored in the flue gas tank 6. During operation, the flue gas is treated by the gas separator 7 and the electrostatic precipitator 8, and then enters the flue gas waste heat recovery heat exchanger 9 to exchange heat with the water tank 17, realizing the recovery of flue gas waste heat and improving energy efficiency. After heat exchange, the flue gas enters the carbon dioxide absorption tower 10 and is collected, and then transported to the carbon dioxide storage tank 12 for photosynthesis of plants in the multi-span greenhouse of facility agriculture. After the working fluid in the carbon dioxide absorption tower 10 reaches saturation with carbon dioxide, it enters the regeneration tower 11 for treatment and is used for the recycling of carbon dioxide. The flue gas passes through the flue gas waste heat recovery heat exchanger 9, using the waste heat in the flue gas to heat the RO water. The heated RO water is used for topdressing plants, seedling cultivation, or water replenishment for the heating system in the multi-span greenhouse, achieving the purpose of energy saving.

[0056] The automatic control system 22 includes temperature sensors, pressure sensors, a data acquisition unit, a PLC control system, and a remote control subsystem. The temperature and pressure sensors collect parameters such as the working fluid temperature, pressure, and ambient temperature within the multi-span greenhouse during system operation. The automatic control system analyzes the collected temperature and pressure signals to schedule the operation of the deep geothermal system, gas-fired boiler system, carbon dioxide recovery system, heating circulating water system, water supply system, and RO water purification equipment 16. The data acquisition unit collects and transmits data for logical operations in system control. The remote control subsystem enables remote monitoring and control of the system. This system achieves the integrated application of deep geothermal heat and gas-fired equipment in modern facility agriculture, forming a zero-carbon heating system that meets the heating, water, and carbon dioxide needs of modern agricultural facilities. Furthermore, since the heat source is deep geothermal heat, a clean and renewable energy source, it contributes to energy conservation and carbon reduction. The automatic control system 22 makes the entire system more automated, easier and more optimized to operate, and less expensive.

[0057] Furthermore, to reduce the amount of carbon dioxide purchased, a hot water storage tank can be installed after the gas-fired boiler system. During off-peak electricity hours, the gas-fired boiler can be used to generate a large amount of carbon dioxide for the photosynthesis of plants in the multi-span greenhouse of facility agriculture. At the same time, the high-temperature hot water generated by the gas-fired boiler can be temporarily stored in the hot water storage tank. When the multi-span greenhouse of facility agriculture has a heat demand, it can be heated by the heat stored in the hot water storage tank without starting the medium-deep geothermal system and the gas-fired boiler system.

[0058] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery, characterized in that: include: Medium-deep geothermal system, the heat exchange part is set at 2000-3000m underground; Gas boiler system; The carbon dioxide recovery system, the inlet end of which is connected to the tail gas outlet of the gas boiler system; A heating circulating water system, wherein the hot water inlet is connected to the hot water supply end of the medium-deep geothermal system and the gas boiler system respectively, the hot water outlet is connected to the terminal heat dissipation device (23) in the agricultural facility (1), and the cold water return pipeline connects the outlet of the terminal heat dissipation device (23) to the return end of the medium-deep geothermal system and the gas boiler system respectively; Wherein, the carbon dioxide recovery system comprises: A flue gas tank (6), the air inlet of which is connected to the tail gas outlet of a gas boiler body (5) of the gas boiler system; A gas separation device (7), the inlet end of which is connected to the gas outlet of the fume tank (6); The inlet end of the carbon dioxide absorption tower (10) is connected to the outlet end of the gas separation device (7). The carbon dioxide absorption tower (10) is also connected to a regeneration tower (11) for cyclically absorbing carbon dioxide. When the carbon dioxide absorption tower (10) reaches saturation, the carbon dioxide enters the regeneration tower (11) for treatment; The carbon dioxide storage tank (12) has an inlet end connected to the outlet end of the carbon dioxide absorption tower (10), and the outlet end is connected to the agricultural facility (1) for providing carbon dioxide thereto.

2. According to claim 1, a medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery is characterized in that: Also includes: An electrostatic precipitator (8) is arranged at the outlet end of the gas separation device (7).

3. A medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 2, characterized in that: The medium-deep geothermal system comprises: The medium-deep rock heat exchange hole (2) is set within 2000-3000m underground; The medium-deep geothermal unit (3) has a cold water supply port connected to a cold water inlet of a medium-deep geothermal heat exchange hole (2) through a medium-deep geothermal heat source side circulation pump (4), and a hot water outlet of the medium-deep geothermal heat exchange hole (2) is connected to a hot water inlet of the medium-deep geothermal unit (3).

4. A medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 3, characterized in that: The heating circulating water system comprises: The user-side water collector (15) has a hot water inlet connected to the hot water supply inlets of the medium-deep rock thermal unit (3) and the gas boiler body (5), and a hot water outlet connected to the water inlet of the terminal heat dissipation device (23); The user-side water distributor (14) has a return water port connected to the water outlet of the terminal heat dissipation device (23) through the user-side heating circulation pump (13), and a water delivery port connected to the return water ports of the medium-deep geothermal unit (3) and the gas boiler body (5).

5. A medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 4, characterized in that: It also includes a replenishment water supply system; The water replenishment and supply system comprises: The water tank (17) has a water supply outlet connected to the return water inlet of the gas boiler body (5), the hot water inlet of the user-side water collector (15), the cold water inlet of the medium-deep layer geothermal heat exchange hole (2), and the water end of the agricultural facility (1) through a gas boiler constant pressure water supply pump (18), a user-side constant pressure water supply pump (19), a medium-deep layer geothermal heat source-side constant pressure water supply pump (20), and a seedling cultivation and topdressing water supply pump (21).

6. A medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 5, characterized in that: The carbon dioxide recovery system further comprises: A flue gas waste heat recovery heat exchanger (9) is arranged at the inlet end of the carbon dioxide absorption tower (10); The cold water inlet of the flue gas waste heat recovery heat exchanger (9) is connected to the cold water outlet of the water tank (17), and the hot water outlet of the flue gas waste heat recovery heat exchanger (9) is connected to the return water outlet of the water tank (17) via a water pump (24).

7. The medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 5 is characterized in that: The water tank (17) is equipped with an RO water purification device (16).

8. The medium-deep rock heat zero-carbon heating system based on carbon dioxide recovery according to claim 6 is characterized in that: Also includes: Automatic control systems (22); The automatic control system (22) comprises: The automatic controller is connected to working parameter detection sensors on the medium-deep geothermal unit (3), the medium-deep geothermal heat source side circulation pump (4), the gas boiler body (5), the flue gas tank (6), the gas separation device (7), the electrostatic precipitator (8), the flue gas waste heat recovery heat exchanger (9), the carbon dioxide absorption tower (10), the regeneration tower (11), the carbon dioxide storage tank (12), the user side heating circulation pump (13), the user side water distributor (14), the RO water purification equipment (16), the water tank (17), the gas boiler constant pressure water supply pump (18), the user side constant pressure water supply pump (19), the medium-deep geothermal heat source side constant pressure water supply pump (20) and the seedling and topdressing water supply pump (21) through signal lines, and feeds back signals to the above devices for equipment operation control and adjustment.

Images