System for producing industrial steam based on medium-deep geothermal energy

Abstract

The utility model provides a system for producing industrial steam based on medium-deep geothermal energy. The system comprises a heat exchanger, a high-temperature heat pump unit and a steam generation module. The heat exchanger is provided with a heating medium inlet, a heating medium outlet, a refrigerant inlet and a refrigerant outlet. And a heating medium inlet and a heating medium outlet of the heat exchanger are connected with a wellhead device of the geothermal well. The high-temperature heat pump unit is provided with a heating medium inlet, a heating medium outlet, a water outlet and a water injection port, the heating medium inlet of the high-temperature heat pump is communicated with the refrigerant outlet of the heat exchanger, and the heating medium outlet of the high-temperature heat pump is communicated with the refrigerant inlet of the heat exchanger. The steam generation module is communicated with the water outlet and is communicated with a steam user. The system for producing the industrial steam based on the medium-deep geothermal energy can directly utilize the geothermal energy, saves fossil fuel, and is environment-friendly and high in practicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of geothermal energy utilization, and particularly relates to a system for producing industrial steam based on medium-deep geothermal energy. Background Art

[0002] Industrial steam is an important form of energy used in the industrial production process. Industrial steam plays a key role in many industries, especially in the fields of chemical industry, textile, food processing, pharmaceutical, steel manufacturing, and pulp production.

[0003] In the prior art, industrial steam is usually generated by burning fossil fuels (such as coal, natural gas, oil, etc.) or biomass energy combustion, which has a greater impact on the environment. Geothermal energy, as a clean and renewable energy source, especially medium-deep geothermal energy, has a relatively high temperature and is widely distributed. However, there is currently no industrial steam production system that directly combines geothermal energy with industrial steam production. Summary of the Utility Model

[0004] An embodiment of the utility model provides a system for producing industrial steam based on medium-deep geothermal energy, aiming to achieve the purpose of combining geothermal energy with industrial steam production.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a system for producing industrial steam based on medium-deep geothermal energy, including:

[0006] A heat exchanger, having a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet and the heat medium outlet of the heat exchanger are both connected to the wellhead device of the geothermal well;

[0007] A high-temperature heat pump unit, having a heat medium inlet, a heat medium outlet, a water outlet, and a water injection port, the heat medium inlet of the high-temperature heat pump is communicated with the refrigerant outlet of the heat exchanger, and the heat medium outlet of the high-temperature heat pump is communicated with the refrigerant inlet of the heat exchanger;

[0008] A steam generation module, which is communicated with the water outlet and is also communicated with a steam user.

[0009] In a possible implementation manner, the water injection port of the high-temperature heat pump unit is communicated with the steam user through a connecting pipeline to recover the condensed steam;

[0010] Wherein, a first circulation pump is provided on the connecting pipeline.

[0011] In a possible implementation manner, a buffer water tank is provided on the connecting pipeline, the buffer water tank has an inlet, an outlet, and a water replenishment port, the inlet of the buffer water tank is communicated with the steam user, and the outlet of the buffer water tank is communicated with the water injection port of the high-temperature heat pump;

[0012] Among them, the first circulation pump is located between the buffer water tank and the high-temperature heat pump unit;

[0013] Among them, a pressure relief valve is provided on the buffer water tank.

[0014] In a possible implementation manner, a heat exchange pipeline is arranged inside the buffer water tank, and the heat exchange pipeline is arranged in a serpentine shape at the bottom of the buffer water tank: both ends of the heat exchange pipeline extend out of the buffer water tank and are connected to an external heat exchange device.

[0015] In a possible implementation manner, the steam generation module includes a flash tank and a steam compressor that are connected in sequence.

[0016] In a possible implementation manner, a second circulation pump is provided between the refrigerant inlet of the heat exchanger and the heat medium outlet of the high-temperature heat pump unit.

[0017] In a possible implementation manner, the heat exchanger is a plate heat exchanger.

[0018] In this implementation manner, the heat exchanger can be directly connected to the wellhead device of the geothermal well, and transfer the heat of the geothermal water to the high-temperature heat pump unit. The high-temperature heat pump unit heats the cold water entering from its water injection port, and the heated water is discharged from the water outlet. Subsequently, the steam generation module reheats and vaporizes the transferred hot water or steam and transfers it to the steam user. This structure can directly utilize geothermal energy, save fossil fuels, is environmentally friendly, and has strong practicability. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a system for producing industrial steam based on medium-deep geothermal energy provided by an embodiment of the present invention;

[0020] 10. Heat exchanger; 11. Second circulation pump;

[0021] 20. High-temperature heat pump unit;

[0022] 30. Steam generation module; 31. Flash tank; 32. Steam compressor;

[0023] 40. Connection pipeline; 41. Buffer water tank; 42. Heat exchange pipeline; 43. First circulation pump;

[0024] 50. Wellhead device. Detailed Embodiments

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] Please refer to Figure 1 , and now a system for producing industrial steam based on medium-deep geothermal energy provided by the present utility model will be described. The system for producing industrial steam based on medium-deep geothermal energy includes a heat exchanger 10, a high-temperature heat pump unit 20, and a steam generation module 30. The heat exchanger 10 has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet. The heat medium inlet and the heat medium outlet of the heat exchanger 10 are both connected to the wellhead device 50 of the geothermal well. The high-temperature heat pump unit 20 has a heat medium inlet, a heat medium outlet, a water outlet, and a water injection port. The heat medium inlet of the high-temperature heat pump is communicated with the refrigerant outlet of the heat exchanger 10, and the heat medium outlet of the high-temperature heat pump is communicated with the refrigerant inlet of the heat exchanger 10. The steam generation module 30 is communicated with the water outlet and is also communicated with the steam user.

[0027] For the system for producing industrial steam based on medium-deep geothermal energy provided in this embodiment, compared with the prior art, the heat exchanger 10 can be directly connected to the wellhead device 50 of the geothermal well, and transfer the heat of the geothermal water to the high-temperature heat pump unit 20. The high-temperature heat pump unit 20 heats up the cold water entering through its water injection port, and the heated water is led out from the water outlet. Subsequently, the steam generation module 30 further heats up and vaporizes the transferred hot water or steam and transfers it to the steam user. This structure can directly utilize geothermal energy, save fossil fuels, is environmentally friendly, and has strong practicability.

[0028] It should be noted that regarding the wellhead device 50 of the geothermal well, which is prior art, it usually has an outlet water pipe and an inlet water pipe. The outlet water pipe is communicated with the heat medium inlet of the heat exchanger 10, and the inlet water pipe is communicated with the heat medium outlet of the heat exchanger 10. Through the recycling of the geothermal water, the heat collection of the geothermal water is realized.

[0029] It should also be noted that regarding the steam user, it can be a heat exchange device, which has a pipeline for steam circulation.

[0030] In some embodiments, the above system for producing industrial steam based on medium-deep geothermal energy can adopt a structure as shown in Figure 1 . Refer to Figure 1 . The water injection port of the high-temperature heat pump unit 20 is communicated with the steam user through a connecting pipeline 40 to recover the condensed steam. A first circulation pump 43 is provided on the connecting pipeline 40 to ensure that water is introduced into the high-temperature heat pump unit 20.

[0031] Connecting the steam user to the water injection port of the high-temperature heat pump through the connecting pipeline 40 can ensure the recovery and reuse of the water after steam condensation, thereby ensuring water conservation.

[0032] Specifically, after the steam generation module 30 is connected to the heat exchange equipment of the steam user, the heat exchange equipment of the steam user is then connected to the water injection port of the high-temperature heat pump through the connecting pipeline 40.

[0033] In some embodiments, the above-mentioned connecting pipeline 40 can adopt the structure as Figure 1 shown. Refer to Figure 1 , a buffer water tank 41 is provided on the connecting pipeline 40. The buffer water tank 41 has an inlet, an outlet, and a water replenishing port. The inlet of the buffer water tank 41 is connected to the steam user, and the outlet of the buffer water tank 41 is connected to the water injection port of the high-temperature heat pump.

[0034] The first circulation pump 43 is located between the buffer water tank 41 and the high-temperature heat pump unit 20, which is convenient for pumping the liquid water in the buffer water tank 41 into the water injection port of the high-temperature heat pump unit 20 to ensure water replenishment.

[0035] Regarding that individual steam users cannot fully utilize the steam, after being introduced into the connecting pipeline 40, the connecting pipeline 40 will be doped with liquid water and some steam. At this time, the buffer water tank 41 can store the two and separate the gas and liquid. Usually, after entering the buffer water tank 41, the liquid water is at the bottom of the buffer water tank 41, and the steam is at the top of the buffer water tank 41. In order to avoid excessive air pressure, a pressure relief valve is provided on the buffer water tank 41 to ensure the air pressure balance in the buffer water tank 41.

[0036] The setting of the water replenishing port can ensure water replenishment to the entire circulation pipeline to ensure stable steam production.

[0037] In this embodiment, the inlet of the buffer water tank 41 can be located at the top end of the buffer water tank 41, and the outlet can be located at the bottom end of the buffer water tank 41.

[0038] The setting of the first circulation pump 43 can ensure that the water in the buffer water tank 41 is pumped into the high-temperature heat pump unit 20.

[0039] In some embodiments, the above-mentioned buffer water tank 41 can adopt the structure as Figure 1 shown. Refer to Figure 1 , a heat exchange pipeline 42 is provided inside the buffer water tank 41. The heat exchange pipeline 42 is arranged in a snake shape at the bottom of the buffer water tank 41: both ends of the heat exchange pipeline 42 extend out of the buffer water tank 41 and are connected to external heat exchange equipment.

[0040] Regarding the gas-liquid mixture in the buffer water tank 41, it still has a certain temperature. Therefore, the heat exchange pipeline 42 can ensure the reuse of the heat in the heat exchange water tank, improving the utilization effect of geothermal energy.

[0041] Specifically, the buffer water tank 41 needs to be arranged close to the high-temperature heat pump unit 20. Therefore, the external heat exchange equipment can be the air-conditioning units and heating pipelines arranged around the buffer water tank 41.

[0042] In some embodiments, the above steam generation module 30 can adopt a structure as Figure 1 shown. Refer to Figure 1 , the steam generation module 30 includes a flash tank 31 and a steam compressor 32 that are connected in sequence.

[0043] The flash tank 31 can mainly realize the conversion of water into steam. Utilizing the difference in the saturated vapor pressure of water at different temperatures, by reducing the pressure, the liquid substance can be rapidly evaporated, ensuring that all the hot water transferred from the high-temperature heat pump unit 20 is vaporized into steam.

[0044] The steam compressor 32 can further increase the pressure and temperature of the steam to meet the demand for industrial steam. The steam compressor 32 can be a Roots steam compressor 32, a screw steam compressor 32, a centrifugal steam compressor 32, etc.

[0045] Specifically, for easy understanding, for example, if the temperature of the medium-deep geothermal water is 90°C, then the temperature of the tail water after passing through the heat exchanger 10 is 25°C. Through heat exchange in the heat exchanger 10, the heat is transferred to the high-temperature heat pump unit 20. The water temperature at the water injection port of the high-temperature heat pump unit 20 is 30°C, and the water temperature at the water outlet of the high-temperature heat pump unit 20 is 120°C. Subsequently, steam is formed through the flash tank 31, and the steam temperature is 120°C. It then continues to enter the steam compressor 32, and the temperature of the steam is raised to above 150°C.

[0046] In some embodiments, the above heat exchanger 10 can adopt a structure as Figure 1 shown. Refer to Figure 1 , a second circulation pump 11 is provided between the refrigerant inlet of the heat exchanger 10 and the heat medium outlet of the high-temperature heat pump unit 20. The setting of the second circulation pump 11 can ensure the circulation of the water between the heat exchanger 10 and the high-temperature heat pump unit 20 to ensure the heat exchange effect.

[0047] In some embodiments, the above heat exchanger 10 can adopt a structure as Figure 1 shown. Refer to Figure 1 , the heat exchanger 10 is a plate heat exchanger 10.

[0048] The plate heat exchanger 10 transfers heat through the heat exchange of metal plates. It is composed of many corrugated metal plates. Narrow channels are formed between the plates, and fluids flow through the channels for heat exchange. The plate heat exchanger 10 has the advantages of compact structure, high heat exchange efficiency, small occupied space, convenient installation and cleaning, etc. Moreover, it is energy-efficient and easy to maintain, and can ensure the efficient transfer of geothermal energy.

[0049] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for producing industrial steam based on medium-deep geothermal energy, characterized in that: include: The heat exchanger has a heat medium inlet, a heat medium outlet, a cold medium inlet and a cold medium outlet; the heat medium inlet and the heat medium outlet of the heat exchanger are both connected to the wellhead device of the geothermal well; The high-temperature heat pump unit has a heat medium inlet, a heat medium outlet, a water outlet and a water injection port, the heat medium inlet of the high-temperature heat pump is connected to the refrigerant outlet of the heat exchanger, and the heat medium outlet of the high-temperature heat pump is connected to the refrigerant inlet of the heat exchanger; The steam generating module is communicated with the water outlet and with a steam user.

2. The system for producing industrial steam based on mid-deep geothermal energy according to claim 1, characterized in that: The water injection port of the high-temperature heat pump unit is connected to the steam user through a connecting pipeline to recover the condensed steam; Wherein, a first circulation pump is provided on the connecting pipeline.

3. The system for producing industrial steam based on mid-deep geothermal energy according to claim 2, characterized in that: A buffer water tank is provided on the connecting pipeline, and the buffer water tank has an inlet, an outlet and a water replenishment port. The inlet of the buffer water tank is connected to the steam user, and the outlet of the buffer water tank is connected to the water injection port of the high-temperature heat pump; Wherein, the first circulation pump is located between the buffer water tank and the high-temperature heat pump unit; Wherein, the buffer water tank is provided with a pressure relief valve.

4. The system for producing industrial steam based on mid-deep geothermal energy according to claim 3, characterized in that: A heat exchange pipeline is provided inside the buffer water tank, and the heat exchange pipeline is arranged in a serpentine shape at the bottom of the buffer water tank: both ends of the heat exchange pipeline extend out of the buffer water tank and are connected to external heat exchange equipment.

5. The system for producing industrial steam based on mid-deep geothermal energy according to any one of claims 1 to 2, characterized in that: The steam generation module includes a flash tank and a steam compressor which are connected in sequence.

6. The system for producing industrial steam based on mid-deep geothermal energy according to any one of claims 1 to 2, characterized in that: A second circulation pump is provided between the refrigerant inlet of the heat exchanger and the heat medium outlet of the high-temperature heat pump unit.

7. The system for producing industrial steam based on mid-deep geothermal energy according to any one of claims 1 to 2, characterized in that: The heat exchanger is a plate heat exchanger.

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