Efficient energy-saving system for outputting green steam through coupling of shallow geothermal energy and high-temperature heat pump

Abstract

The utility model provides an efficient energy-saving system for outputting green steam through coupling of shallow geothermal energy and a high-temperature heat pump, and belongs to the technical field of energy systems. The problem that an existing steam supply system cannot generate green steam energy is solved. Comprising a shallow ground source heat pump system and a high-temperature heat pump system which are connected in series, the shallow ground source heat pump system comprises a buried pipe heat exchange system, a ground source side automatic make-up pump, a water collector, a ground source side circulating water pump, a water segregator and a ground source heat pump host, and the buried pipe heat exchange system is connected with the water collector and the water segregator; the high-temperature heat pump system comprises a heat source side circulating water pump, an evaporator, a compressor, an electronic expansion valve, a condenser, a flash evaporator, a high-temperature hot water circulating pump, a preheater and a high-temperature heat pump automatic make-up pump; according to the utility model, renewable geothermal energy and certain electric energy are utilized for assistance, high-temperature steam is output, the production load requirement of the park is met, carbon emission is avoided, carbon sink is increased, and the economic benefit is high.

Description

Technical Field

[0001] This invention provides a highly efficient and energy-saving system that couples shallow geothermal energy with a high-temperature heat pump to output green steam, belonging to the field of energy system technology. Background Technology

[0002] Currently, the commonly used steam supply systems in the industrial park are gas-fired boilers, coal-fired boilers, electrode boilers to supply steam, and steam extracted from nearby power plants through laid steam pipelines.

[0003] Coal-fired boilers generally have low efficiency, resulting in significant fuel waste. They require continuous replenishment of coal, have low levels of automation, and incur high labor costs. Coal needs to be stored in large spaces, which easily generates dust pollution. Transportation and storage costs are also high. Furthermore, the treatment of coal slag and ash is difficult and may cause secondary pollution. Such systems are highly polluting, energy-inefficient, and unsuitable for creating zero-carbon industrial parks.

[0004] Gas-fired boilers suffer from high long-term operating costs due to volatile natural gas prices (especially when prices are high), requiring dedicated gas pipelines and incurring significant initial investment. Although natural gas is a clean fuel, it still emits nitrogen oxides (NOx), necessitating the addition of purification equipment. This results in high operating costs and poor economic viability for such systems.

[0005] High-temperature heat pumps can generate high-temperature, high-pressure steam through flash tanks, but they require municipal hot water at 60-70°C. Industrial parks typically lack adequate municipal heating systems, necessitating the construction of new hot water boilers to provide this 60-70°C water. This results in high initial investment and operating costs, making it uneconomical and unsuitable for creating zero-carbon industrial parks. Creating zero-carbon parks requires reducing reliance on traditional fossil fuels on the energy supply side by utilizing renewable green energy sources for steam supply to meet production load demands, reduce carbon emissions, and increase carbon sequestration. Utility Model Content

[0006] To address the problem that existing steam supply systems cannot generate green steam energy, this invention proposes a highly efficient and energy-saving system that couples shallow geothermal energy with a high-temperature heat pump to output green steam. This system is suitable for zero-carbon industrial parks that require high-temperature steam to meet production load demands, as well as industrial parks without municipal water supply and return systems.

[0007] The technical solution adopted by this utility model is as follows: a high-efficiency and energy-saving system that couples shallow geothermal energy and high-temperature heat pump to output green steam, including a shallow ground source heat pump system and a high-temperature heat pump system. The shallow ground source heat pump system includes a buried pipe heat exchange system, a ground source side automatic water replenishment pump, a water collector, a ground source side circulating water pump, a water distributor, and a ground source heat pump host. The buried pipe heat exchange system is connected to the water collector and the water distributor. The water collector and the water distributor are connected by water pipes. The water collector and the water distributor are respectively connected to the ground source heat pump host through water pipes. A ground source side circulating water pump is installed on the water pipe connecting the water collector and the ground source heat pump host.

[0008] The high-temperature heat pump system includes a heat source circulating water pump, an evaporator, a compressor, an electronic expansion valve, a condenser, a flash evaporator, a high-temperature hot water circulating pump, a preheater, and a high-temperature heat pump automatic water replenishment pump. The ground source heat pump unit is connected to the evaporator through a circulating water pipe, and the heat source circulating water pump is installed on the water inlet pipe connecting the ground source heat pump unit and the evaporator. The evaporator and the condenser are connected through a circulating refrigerant pipeline, which includes an inlet refrigerant pipeline and a return refrigerant pipeline. A compressor is installed on the inlet refrigerant pipeline, and an electronic expansion valve is installed on the return refrigerant pipeline.

[0009] The high-temperature hot water from the condenser is fed into the flash evaporator through a water pipe. One outlet of the flash evaporator outputs high-temperature and high-pressure steam, and the other outlet of the flash evaporator is connected to the condenser and the preheater through water pipes. The preheater is connected to the return water pipe of the ground source heat pump unit and the evaporator through a circulating water pipe.

[0010] The inlets of the ground source automatic water replenishment pump and the high-temperature heat pump automatic water replenishment pump are connected to the municipal tap water supply through water pipes. The outlets of the ground source automatic water replenishment pump are connected to the ground source heat pump host and the water collector, respectively, and the outlet of the high-temperature heat pump automatic water replenishment pump is connected to the preheater.

[0011] Furthermore, temperature and pressure sensors are installed on the return refrigerant pipeline, and the control end of the electronic expansion valve, temperature sensor, and pressure sensor are connected to the controller via wires.

[0012] Furthermore, a first solenoid valve is installed on the water pipe connecting the ground source automatic water supply pump to the municipal tap water supply.

[0013] Furthermore, a second solenoid valve is installed on the water pipe connecting the high-temperature heat pump automatic water replenishment pump to the municipal tap water supply.

[0014] Furthermore, a third solenoid valve is installed on the water pipe connecting the water collector and the water distributor.

[0015] Furthermore, a fourth solenoid valve is installed on the water pipe connecting the water collector to the ground source heat pump unit, and a fifth solenoid valve is installed on the water pipe connecting the water distributor to the ground source heat pump unit.

[0016] Furthermore, a sixth solenoid valve is installed on the water inlet pipe connecting the ground source heat pump unit to the evaporator.

[0017] Furthermore, a seventh solenoid valve is installed on the pipe through which the flash evaporator outputs high-temperature, high-pressure steam.

[0018] Furthermore, the compressor is a multi-stage compressor.

[0019] The advantages of this invention compared to existing technologies are as follows: This invention achieves highly efficient and energy-saving operation by connecting a shallow ground source heat pump system in series with a high-temperature heat pump steam supply system. Creating a zero-carbon industrial park requires green energy. The shallow ground source heat pump system provides 60°C hot water to the high-temperature heat pump, meeting its operating conditions, and provides high-temperature steam to the industrial park, satisfying its production load requirements. Through this system, low-quality geothermal energy is extracted, and with the input of a certain amount of electricity, high-temperature green steam is generated, thus improving the quality of energy. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the system of this utility model;

[0022] In the diagram: 1 is the ground source side automatic water replenishment pump, 2 is the buried pipe heat exchange system, 3 is the shallow ground source heat pump system, 4 is the water collector, 5 is the ground source side circulating water pump, 6 is the water distributor, 7 is the ground source heat pump main unit, 8 is the heat source side circulating water pump, 9 is the high temperature heat pump system, 10 is the evaporator, 11 is the compressor, 12 is the controller, 13 is the temperature sensor, 14 is the pressure sensor, 15 is the electronic expansion valve, 16 is the condenser, 17 is the flash evaporator, 18 is the high temperature hot water circulating pump, 19 is the preheater, and 20 is the high temperature heat pump automatic water replenishment pump. Detailed Implementation

[0023] like Figure 1 As shown, this utility model provides a high-efficiency and energy-saving system that couples shallow geothermal energy and a high-temperature heat pump to output green steam. It includes a shallow ground source heat pump system 3 and a high-temperature heat pump system 9. The shallow ground source heat pump system 3 includes a buried pipe heat exchange system 2, a ground source-side automatic water supply pump 1, a water collector 4, a ground source-side circulating water pump 5, a water distributor 6, and a ground source heat pump main unit 7. The buried pipe heat exchange system 2 is connected to the water collector 4 and the water distributor 6, which are connected by water pipes. The water collector 4 and the water distributor 6 are respectively connected to the ground source heat pump main unit 7 via water pipes. The ground source-side circulating water pump 5 is installed on the water pipe connecting the water collector 4 and the ground source heat pump main unit 7. The buried pipe heat exchange system 2 is connected to the water collector 4, and the water is pressurized and transported to the ground source heat pump main unit 7 by the ground source-side circulating water pump 5. After heat extraction, the water enters the water distributor 6 and returns to the buried pipe heat exchange system 2.

[0024] The high-temperature heat pump system 9 includes a heat source circulating water pump 8, an evaporator 10, a compressor 11, an electronic expansion valve 15, a condenser 16, a flash evaporator 17, a high-temperature hot water circulating pump 18, a preheater 19, and a high-temperature heat pump automatic water replenishment pump 20. The ground source heat pump host 7 is connected to the evaporator 10 through a circulating water pipe, and the heat source circulating water pump 8 is installed on the water inlet pipe connecting the ground source heat pump host 7 and the evaporator 10. The evaporator 10 and the condenser 16 are connected through a circulating refrigerant pipeline. The circulating refrigerant pipeline includes an inlet refrigerant pipeline and a return refrigerant pipeline. The compressor 11 is installed on the inlet refrigerant pipeline, and the electronic expansion valve 15 is installed on the return refrigerant pipeline.

[0025] The high-temperature hot water from the condenser 16 is fed into the flash evaporator 17 through a water pipe. One outlet of the flash evaporator 17 outputs high-temperature and high-pressure steam. The other outlet of the flash evaporator 17 is connected to the condenser 16 and the preheater 19 through a water pipe. The preheater 19 is connected to the return water pipe of the ground source heat pump host 7 and the evaporator 10 through a circulating water pipe.

[0026] The inlets of the ground source automatic water replenishment pump 1 and the high temperature heat pump automatic water replenishment pump 20 are connected to the municipal tap water supply through water pipes, respectively. The outlet of the ground source automatic water replenishment pump 1 is connected to the ground source heat pump host 7 and the water collector 4, respectively. The outlet of the high temperature heat pump automatic water replenishment pump 20 is connected to the preheater 19.

[0027] Hot water from the ground source heat pump unit 7 is pressurized and transported to the evaporator 10 by the heat source side circulating water pump 8, and the hot water return water is cooled by the preheater 19 and then mixed with the original return water before being cooled back to the ground source heat pump unit 7.

[0028] The refrigerant gas from the evaporator 10 is pressurized by the compressor 11 and sent to the condenser 16, where it condenses and releases heat to become refrigerant liquid. The liquid then passes through the electronic expansion valve 15 to reduce its pressure and enter the evaporator 10 for evaporation.

[0029] The high-temperature hot water from condenser 16 is flashed into high-temperature steam by flash evaporator 17 and output. The high-temperature hot water that is not flashed is returned to condenser 16 by high-temperature hot water circulation pump 18 and is reheated.

[0030] Municipal tap water is automatically supplied to the underground pipe heat exchange system 2 via the ground source side automatic water supply pump 1, and then to the condenser 16 via the high temperature heat pump automatic water supply pump 20, and is heated by the preheater 19.

[0031] Furthermore, the electronic expansion valve 15 is electrically connected to the controller 12. A temperature sensor 13 and a pressure sensor 14 are also installed on the refrigerant liquid pipeline connecting the evaporator 10 and the condenser 16. Both the temperature sensor 13 and the pressure sensor 14 are connected to the controller 12. The controller 12 further controls the opening and closing degree of the electronic expansion valve 15 based on the temperature and pressure on the refrigerant liquid pipeline collected by the temperature sensor 13 and the pressure sensor 14.

[0032] Furthermore, a first solenoid valve is installed on the water pipe connecting the ground source automatic water supply pump 1 to the municipal tap water supply. A second solenoid valve is installed on the water pipe connecting the high-temperature heat pump automatic water supply pump 20 to the municipal tap water supply. A third solenoid valve is installed on the water pipe connecting the water collector 4 and the water distributor 6. A fourth solenoid valve is installed on the water pipe connecting the water collector 4 to the ground source heat pump main unit 7, and a fifth solenoid valve is installed on the water pipe connecting the water distributor 6 to the ground source heat pump main unit 7. A sixth solenoid valve is installed on the inlet pipe connecting the ground source heat pump main unit 7 to the evaporator 10. A seventh solenoid valve is installed on the pipe from which the flash evaporator 17 outputs high-temperature and high-pressure steam. The compressor 11 uses a multi-stage compressor connection.

[0033] The operating mode of this utility model is as follows: after the shallow ground source heat pump system 3 extracts green and renewable geothermal energy, it outputs 60° hot water after the heat energy grade is improved for use by the high temperature heat pump system 9. After the energy cascade conversion of the high temperature heat pump system 9, it outputs high temperature steam of 120°C / 0.2MPa.

[0034] Regarding the specific structure of this utility model, it should be noted that the connection relationships between the various component modules adopted in this utility model are definite and achievable. Except as specifically described in the embodiments, their specific connection relationships can bring about corresponding technical effects and solve the technical problems proposed by this utility model without relying on the execution of corresponding software programs. The models of the components, modules, and specific components appearing in this utility model, the connection methods between them, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, unless specifically described, are all publicly disclosed content in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by those skilled in the art before the application date, or belong to conventional technology, common knowledge, and other existing technologies in this field. There is no need to elaborate, which makes the technical solution provided in this case clear, complete, and achievable, and can reproduce or obtain corresponding physical products based on this technical means.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A highly efficient and energy-saving system that couples shallow geothermal energy with a high-temperature heat pump to output green steam, characterized in that: The system includes a shallow ground source heat pump system (3) and a high temperature heat pump system (9). The shallow ground source heat pump system (3) includes a buried pipe heat exchange system (2), a ground source side automatic water replenishment pump (1), a water collector (4), a ground source side circulating water pump (5), a water distributor (6), and a ground source heat pump host (7). The buried pipe heat exchange system (2) is connected to the water collector (4) and the water distributor (6). The water collector (4) and the water distributor (6) are connected by water pipes. The water collector (4) and the water distributor (6) are respectively connected to the ground source heat pump host (7) by water pipes. The ground source side circulating water pump (5) is installed on the water pipe connected to the water collector (4) and the ground source heat pump host (7). The high-temperature heat pump system (9) includes a heat source circulating water pump (8), an evaporator (10), a compressor (11), an electronic expansion valve (15), a condenser (16), a flash evaporator (17), a high-temperature hot water circulating pump (18), a preheater (19), and a high-temperature heat pump automatic water replenishment pump (20). The ground source heat pump host (7) is connected to the evaporator (10) through a circulating water pipe, and the heat source circulating water pump (8) is installed on the water inlet pipe connecting the ground source heat pump host (7) and the evaporator (10). The evaporator (10) and the condenser (16) are connected through a circulating refrigerant pipe. The circulating refrigerant pipe includes an inlet refrigerant pipe and a return refrigerant pipe. The compressor (11) is installed on the inlet refrigerant pipe, and the electronic expansion valve (15) is installed on the return refrigerant pipe. The high-temperature hot water from the condenser (16) is fed into the flash evaporator (17) through a water pipe. One outlet of the flash evaporator (17) outputs high-temperature and high-pressure steam. The other outlet of the flash evaporator (17) is connected to the condenser (16) and the preheater (19) through water pipes. The preheater (19) is connected to the return water pipe of the ground source heat pump host (7) and the evaporator (10) through a circulating water pipe. The inlets of the ground source automatic water supply pump (1) and the high temperature heat pump automatic water supply pump (20) are connected to the municipal tap water supply through water pipes, respectively. The outlet of the ground source automatic water supply pump (1) is connected to the ground source heat pump host (7) and the water collector (4), respectively. The outlet of the high temperature heat pump automatic water supply pump (20) is connected to the preheater (19).

2. The high-efficiency energy-saving system for coupling shallow geothermal energy and high-temperature heat pump to output green steam according to claim 1, characterized in that: Temperature sensor (13) and pressure sensor (14) are also installed on the return refrigerant pipeline. The control end of the electronic expansion valve (15), temperature sensor (13), and pressure sensor (14) are connected to the controller (12) through wires.

3. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: The ground source side automatic water supply pump (1) is connected to the municipal tap water pipe and a first solenoid valve is also installed.

4. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: The high-temperature heat pump automatic water replenishment pump (20) is also equipped with a second solenoid valve on the water pipe connected to the municipal tap water supply.

5. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: A third solenoid valve is installed on the water pipe connecting the water collector (4) and the water distributor (6).

6. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: A fourth solenoid valve is installed on the water pipe connecting the water collector (4) to the ground source heat pump host (7), and a fifth solenoid valve is installed on the water pipe connecting the water distributor (6) to the ground source heat pump host (7).

7. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: A sixth solenoid valve is installed on the water inlet pipe connecting the ground source heat pump unit (7) and the evaporator (10).

8. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: A seventh solenoid valve is installed on the pipeline that outputs high-temperature and high-pressure steam from the flash evaporator (17).

9. A high-efficiency energy-saving system for coupling shallow geothermal energy and a high-temperature heat pump to output green steam, as described in claim 1 or 2, characterized in that: The compressor (11) is a multi-stage compressor.

Images