High-temperature heat pump external oil cooling system based on geothermal exploitation

Abstract

The utility model provides a high-temperature heat pump external oil cooling system based on geothermal exploitation. The high-temperature heat pump external oil cooling system comprises a first heat exchanger, a high-temperature heat pump and a second heat exchanger. A heating medium inlet of the first heat exchanger is communicated with a water inlet pipe led out of the geothermal well; the high-temperature heat pump communicates with the first heat exchanger and the heating unit. The high-temperature heat pump is provided with an external oil inlet and an external oil outlet; a refrigerant inlet of the second heat exchanger is communicated with a heating medium outlet of the first heat exchanger, and a refrigerant outlet of the second heat exchanger is communicated with a recharge water pipe led out of the geothermal well through a backflow pipeline. And a heating medium inlet and a heating medium outlet of the second heat exchanger are respectively communicated with an external oil inlet and an external oil outlet of the high-temperature heat pump. The utility model provides a high-temperature heat pump external oil cooling system based on geothermal energy exploitation, and aims to solve the problem that the practicability is poor due to the fact that an extra cooling device is needed to cool a high-temperature heat pump in an existing heating mode that geothermal energy exploitation is matched with the high-temperature heat pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating systems, and in particular relates to a high-temperature heat pump external oil cooling system based on geothermal exploitation. Background Art

[0002] Geothermal water refers to groundwater containing mineral salts or gases. Geothermal water is widely used in heating, aquaculture, bathing and other fields. Geothermal water is a natural resource with multiple uses and values. Its development and utilization are of great significance to promoting sustainable development. However, while making rational use of it, it is also necessary to pay attention to environmental protection. Generally, when geothermal wells are used for heating, high-temperature geothermal water is extracted and then re-injected into the geothermal wells after use.

[0003] In the prior art, geothermal water extracted from geothermal wells is usually exchanged with heating units through heat exchangers. When the heating capacity of the geothermal well is less than the heat load demand of the heating unit, a high-temperature heat pump is usually installed between the heat exchanger and the heating unit to heat up the hot water again. After the geothermal water passes through the heat exchanger, its temperature will drop to about 20°C and then be re-injected into the geothermal well. The heat utilization rate has certain limitations. However, after the high-temperature heat pump is turned on, the circulating hot oil inside it needs to be cooled by an external cooling device. The cooling equipment occupies a large area and requires additional consumption, resulting in poor resource utilization and poor practicality. Utility Model Content

[0004] The utility model provides an external oil cooling system for a high-temperature heat pump based on geothermal exploitation, aiming to solve the problem of poor practicality of the existing heating method of geothermal exploitation combined with a high-temperature heat pump due to the need for additional cooling equipment to cool the high-temperature heat pump.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a high-temperature heat pump external oil cooling system based on geothermal exploitation, including:

[0006] The first heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet of the first heat exchanger is connected to a water inlet pipe derived from a geothermal well;

[0007] A high-temperature heat pump is connected to the first heat exchanger and the heating unit respectively; the high-temperature heat pump has an external oil inlet and an external oil outlet;

[0008] The second heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the refrigerant inlet of the second heat exchanger is connected to the heat medium outlet of the first heat exchanger, and the refrigerant outlet of the second heat exchanger is connected to the reinjection water pipe derived from the geothermal well through a return pipeline; the heat medium inlet and the heat medium outlet of the second heat exchanger are respectively connected to the external oil inlet and the external oil outlet of the high-temperature heat pump.

[0009] In a possible implementation manner, the first heat exchanger is a plate heat exchanger.

[0010] In a possible implementation manner, the second heat exchanger is a plate heat exchanger.

[0011] In a possible implementation, a first thermometer is provided between a heat medium outlet of the first heat exchanger and a cool medium inlet of the second heat exchanger.

[0012] In a possible implementation, the high-temperature heat pump external oil cooling system based on geothermal exploitation further includes a third heat exchanger, the third heat exchanger is arranged on the return pipeline, and the third heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the refrigerant inlet and the refrigerant outlet of the third heat exchanger are both connected to the return pipeline; the heat medium inlet of the third heat exchanger is connected to the heat medium outlet of the second heat exchanger through a first pipeline, and the heat medium outlet of the third heat exchanger is connected to the external oil inlet of the high-temperature heat pump through a second pipeline;

[0013] Wherein, the first pipeline and the second pipeline are both provided with a first control valve; and a second control valve is provided on the pipeline connecting the external oil inlet of the high-temperature heat pump and the refrigerant outlet of the second heat exchanger.

[0014] In a possible implementation, the third heat exchanger is a plate heat exchanger.

[0015] In a possible implementation manner, a second thermometer is provided on the first pipeline.

[0016] The beneficial effect of the high-temperature heat pump external oil cooling system based on geothermal exploitation provided by the utility model is that: compared with the prior art, by connecting the heat medium inlet of the first heat exchanger with the water inlet pipe, the geothermal water in the geothermal well is introduced into the first heat exchanger through the water inlet pipe for heat exchange. The high-temperature heat pump is connected to the first heat exchanger and the heating unit, and the high-temperature heat pump extracts heat from the intermediate water after heat exchange in the first heat exchanger to heat the circulating water, and then introduces it into the heating unit for use. The refrigerant inlet of the second heat exchanger is connected to the heat medium outlet of the first heat exchanger, so that the geothermal water after heat exchange in the first heat exchanger can be introduced into the second heat exchanger. The heat medium inlet of the second heat exchanger is connected to the external oil inlet of the high-temperature heat pump, and the heat medium outlet of the second heat exchanger is connected to the external oil outlet, and then the external oil of the high-temperature heat pump is cooled by the second heat exchanger, the temperature of the geothermal water in the second heat exchanger is increased, and the refrigerant outlet of the second heat exchanger is connected to the geothermal well, and finally the water in the second heat exchanger is introduced into the geothermal well through the recharging water pipe. Usually, the temperature of geothermal water when it is recharged into the geothermal well is about 20℃. The geothermal water has a process of cooling down and then heating up after passing through the first heat exchanger and the second heat exchanger. Therefore, in the process of exchanging heat with the geothermal water through the first heat exchanger, the available heat in the geothermal water increases, making the heat exchange more sufficient and improving the heat utilization rate. At the same time, the external oil of the high-temperature heat pump is cooled by the second heat exchanger, realizing the recycling of resources, enhancing the heat exchange effect, reducing additional consumption, saving costs, and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a high-temperature heat pump external oil cooling system based on geothermal exploitation provided by an embodiment of the utility model Figure 1 ;

[0018] Figure 2 A schematic diagram of the structure of a high-temperature heat pump external oil cooling system based on geothermal exploitation provided by an embodiment of the utility model Figure 2 .

[0019] Description of reference numerals:

[0020] 10. First heat exchanger; 20. High-temperature heat pump; 30. Second heat exchanger; 40. First thermometer; 50. Third heat exchanger; 60. First control valve; 70. Second control valve; 80. Second thermometer; 90. Water inlet pipe; 100. Geothermal well; 110. Heating unit. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] It should be noted that the directions or positional relationships indicated by terms such as “length”, “width”, “height”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head” and “tail” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the referred system or element must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0023] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "fixation", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0025] Please also read Figure 1 and Figure 2 Now, the high-temperature heat pump external oil cooling system based on geothermal exploitation provided by the utility model is described. The high-temperature heat pump external oil cooling system based on geothermal exploitation includes a first heat exchanger 10, a high-temperature heat pump 20 and a second heat exchanger 30. The first heat exchanger 10 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The heat medium inlet of the first heat exchanger 10 is connected to the water inlet pipe 90 derived from the geothermal well 100. The high-temperature heat pump 20 is connected to the first heat exchanger 10 and the heating unit 110 respectively. The high-temperature heat pump 20 has an external oil inlet and an external oil outlet. The second heat exchanger 30 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The refrigerant inlet of the second heat exchanger 30 is connected to the heat medium outlet of the first heat exchanger 10, and the refrigerant outlet of the second heat exchanger 30 is connected to the recharge water pipe derived from the geothermal well 100 through a return pipeline. The heat medium inlet and the heat medium outlet of the second heat exchanger 30 are respectively connected to the external oil inlet and the external oil outlet of the high-temperature heat pump 20 .

[0026] In this embodiment, the heat medium inlet of the first heat exchanger 10 is connected to the water inlet pipe 90 derived from the geothermal well 100, so that the geothermal water in the geothermal well 100 is introduced into the first heat exchanger 10 through the water inlet pipe 90, and the geothermal water is heat-exchanged by the first heat exchanger 10. The high-temperature heat pump 20 is connected to both the first heat exchanger 10 and the heating unit 110, and the high-temperature heat pump 20 extracts heat from the intermediate water after the heat exchange of the first heat exchanger 10, heats the circulating water to increase the temperature, and then introduces it into the heating unit 110 for use. The refrigerant inlet of the second heat exchanger 30 is connected to the heat medium outlet of the first heat exchanger 10, the heat medium inlet of the second heat exchanger 30 is connected to the external oil inlet of the high-temperature heat pump 20, the heat medium outlet of the second heat exchanger 30 is connected to the external oil outlet, and at the same time, the refrigerant outlet of the second heat exchanger 30 is connected to the reinjection water pipe derived from the geothermal well 100 through a return pipeline, so that the geothermal water after heat exchange in the first heat exchanger 10 is introduced into the second heat exchanger 30, and then the external oil of the high-temperature heat pump 20 is cooled by the second heat exchanger 30, the temperature of the geothermal water in the second heat exchanger 30 increases, and finally the water in the second heat exchanger 30 is introduced into the geothermal well 100 through the reinjection water pipe.

[0027] Compared with the prior art, the high-temperature heat pump external oil cooling system based on geothermal exploitation provided by the embodiment of the utility model connects the heat medium inlet of the first heat exchanger 10 with the water inlet pipe 90, so that the geothermal water in the geothermal well 100 is introduced into the first heat exchanger 10 through the water inlet pipe 90 for heat exchange. The high-temperature heat pump 20 is connected to both the first heat exchanger 10 and the heating unit 110. The high-temperature heat pump 20 extracts heat from the intermediate water after heat exchange in the first heat exchanger 10 to heat the circulating water, and then introduces it into the heating unit 110 for use. The refrigerant inlet of the second heat exchanger 30 is connected to the heat medium outlet of the first heat exchanger 10, so that the geothermal water after heat exchange in the first heat exchanger 10 can be introduced into the second heat exchanger 30. The heat medium inlet of the second heat exchanger 30 is connected to the external oil inlet of the high-temperature heat pump 20, and the heat medium outlet of the second heat exchanger 30 is connected to the external oil outlet. Then, the external oil of the high-temperature heat pump 20 is cooled by the second heat exchanger 30, and the temperature of the geothermal water in the second heat exchanger 30 increases. At the same time, the refrigerant outlet of the second heat exchanger 30 is connected to the geothermal well 100, and finally, the water in the second heat exchanger 30 is introduced into the geothermal well 100 through the reinjection water pipe. Usually, the temperature of geothermal water is about 20°C when it is reinjected into the geothermal well 100. The geothermal water has a process of cooling and then heating after passing through the first heat exchanger 10 and the second heat exchanger 30. Therefore, in the process of heat exchange of geothermal water by the first heat exchanger 10, the available heat in the geothermal water increases, making the heat exchange more sufficient and improving the heat utilization rate. At the same time, the external oil of the high-temperature heat pump 20 is cooled by the second heat exchanger 30, which realizes the recycling of resources, enhances the heat exchange effect, reduces additional consumption, saves costs, and has good practicality.

[0028] Specifically, after the geothermal water is heat exchanged by the first heat exchanger 10, the temperature can be lower than 20°C (for example, 15°C), and then the temperature is raised to about 20°C during the cooling process of the external oil of the high-temperature heat pump 20 by the second heat exchanger 30. In this way, when the heat is exchanged by the first heat exchanger 10, the heat of the geothermal water that can be used is increased, so that the heat exchange is more sufficient and the heat utilization rate of the geothermal water is improved.

[0029] In some embodiments, see Figure 1 The first heat exchanger 10 is a plate heat exchanger. The plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. The plate heat exchanger is an ideal device for liquid-liquid heat exchange. It has the characteristics of high heat exchange efficiency, low heat loss, compact and light structure, small footprint, wide application, and long service life. Under the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of a tube heat exchanger, and the footprint is one-third of that of a tube heat exchanger. The heat recovery rate can be as high as more than 90%.

[0030] In some embodiments, the second heat exchanger 30 is a plate heat exchanger.

[0031] In some embodiments, see Figure 1 and Figure 2 A first thermometer 40 is provided between the heat medium outlet of the first heat exchanger 10 and the cold medium inlet of the second heat exchanger 30. In this embodiment, the temperature of the geothermal water after heat exchange by the geothermal heat exchanger can be read by the first thermometer 40, and the heat exchange time of the geothermal water in the first heat exchanger 10 can be adjusted according to the temperature displayed by the first thermometer 40, so as to make fuller use of the heat of the geothermal water and improve the heat utilization rate.

[0032] In some embodiments, see Figure 2The high-temperature heat pump external oil cooling system based on geothermal exploitation provided by the embodiment of the utility model also includes a third heat exchanger 50. The third heat exchanger 50 is arranged on the return pipeline. The third heat exchanger 50 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The refrigerant inlet and the refrigerant outlet of the third heat exchanger 50 are both connected to the return pipeline. The heat medium inlet of the third heat exchanger 50 is connected to the heat medium outlet of the second heat exchanger 30 through a first pipeline, and the heat medium outlet of the third heat exchanger 50 is connected to the external oil inlet of the high-temperature heat pump 20 through a second pipeline. Among them, a first control valve 60 is provided on both the first pipeline and the second pipeline. A second control valve 70 is provided on the pipeline connecting the external oil inlet of the high-temperature heat pump 20 and the refrigerant outlet of the second heat exchanger 30. In this embodiment, the heat medium inlet of the third heat exchanger 50 is connected to the heat medium outlet of the second heat exchanger 30 through the first pipeline. When the two first control valves 60 are closed and the second control valve 70 is opened, the geothermal water after heat exchange in the second heat exchanger 30 is guided to the geothermal well 100 through the first pipeline, the third heat exchanger 50 and the recharging water pipe in sequence. When the two first control valves 60 are opened and the second control valve 70 is closed, the heat medium outlet of the second heat exchanger 30 is connected to the heat medium inlet of the third heat exchanger 50, and the geothermal water after heat exchange in the second heat exchanger 30 flows to the third heat exchanger 50 through the first pipeline. The heat medium outlet of the third heat exchanger 50 is connected to the external oil inlet of the high-temperature heat pump 20, so that the external oil is cooled again through the third heat exchanger 50. After the geothermal water in the third heat exchanger 50 is heated again, it is guided to the geothermal well 100 through the recharging water pipe. The external oil is cooled secondarily by the third heat exchanger 50, thereby ensuring the cooling effect of the external oil, and the geothermal water can also fully absorb the heat in the external oil, realizing the recycling of resources, saving costs and having good practicality.

[0033] In some embodiments, the third heat exchanger 50 is a plate heat exchanger.

[0034] In some embodiments, see Figure 2 , a second thermometer 80 is provided on the first pipeline. In this embodiment, the temperature of the geothermal water after heat exchange in the geothermal heat exchanger can be read by the second thermometer 80, and the heat exchange time of the geothermal water in the third heat exchanger 50 can be adjusted according to the temperature displayed by the second thermometer 80, so as to make fuller use of the heat of the external oil, realize the recycling of resources, and improve the heat utilization rate.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature heat pump external oil cooling system based on geothermal exploitation, characterized in that: include: The first heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet of the first heat exchanger is connected to a water inlet pipe derived from a geothermal well; A high-temperature heat pump is connected to the first heat exchanger and the heating unit respectively; the high-temperature heat pump has an external oil inlet and an external oil outlet; The second heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the refrigerant inlet of the second heat exchanger is connected to the heat medium outlet of the first heat exchanger, and the refrigerant outlet of the second heat exchanger is connected to the reinjection water pipe derived from the geothermal well through a return pipeline; the heat medium inlet and the heat medium outlet of the second heat exchanger are respectively connected to the external oil inlet and the external oil outlet of the high-temperature heat pump.

2. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to claim 1, characterized in that: The first heat exchanger is a plate heat exchanger.

3. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to claim 1 is characterized in that: The second heat exchanger is a plate heat exchanger.

4. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to any one of claims 1 to 3, characterized in that: A first thermometer is provided between the heat medium outlet of the first heat exchanger and the cool medium inlet of the second heat exchanger.

5. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to claim 1, characterized in that: The high-temperature heat pump external oil cooling system based on geothermal exploitation also includes a third heat exchanger, which is arranged on the return pipeline, and has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the refrigerant inlet and the refrigerant outlet of the third heat exchanger are both connected to the return pipeline; the heat medium inlet of the third heat exchanger is connected to the heat medium outlet of the second heat exchanger through a first pipeline, and the heat medium outlet of the third heat exchanger is connected to the external oil inlet of the high-temperature heat pump through a second pipeline; Wherein, the first pipeline and the second pipeline are both provided with a first control valve; and a second control valve is provided on the pipeline connecting the external oil inlet of the high-temperature heat pump and the refrigerant outlet of the second heat exchanger.

6. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to claim 5, characterized in that: The third heat exchanger is a plate heat exchanger.

7. The high-temperature heat pump external oil cooling system based on geothermal exploitation according to claim 5, characterized in that: The first pipeline is provided with a second thermometer.

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