A method, product, equipment and medium for utilizing deep geothermal temperature

Abstract

The present application relates to the field of geothermal utilization technology, and in particular to a method, product, equipment and medium for utilizing deep geothermal temperature. The method includes: receiving the user's heat demand, the heat demand includes the first ambient temperature of the heat-using equipment and the expected ambient temperature range; determining the flow rate of the heat exchanger in the first cycle based on the first ambient temperature, the expected ambient temperature range and the historical heat exchange efficiency of the heat exchanger; when the flow rate does not exceed the maximum flow rate of the heat exchanger, controlling the conveying device to convey the geothermal water output from the geothermal extraction well to the heat exchanger according to the flow rate; real-time monitoring of the outlet water temperature of the geothermal extraction well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment; based on the outlet water temperature, output temperature and ambient temperature changes, formulating the heating strategy for the second cycle. The present application can optimize the performance coefficient of the high-temperature water source heat pump group and achieve efficient heating.

Description

Technical Field

[0001] The present application relates to the field of geothermal utilization technology, and in particular to a method, product, equipment and medium for utilizing deep geothermal temperature. Background Art

[0002] Geothermal energy, as a kind of heat energy contained in the molten rock inside the earth's crust, is a rich and clean renewable energy on the earth. It has a large thermal energy storage capacity and is widely distributed. Especially in my country, the resource reserves are particularly rich, and it has broad development prospects and huge market potential. Actively developing and utilizing geothermal energy can not only effectively alleviate the energy resource pressure faced by my country, but also has far-reaching significance for adjusting the energy structure, reducing environmental pollution, and promoting green environmental protection and ecological civilization construction.

[0003] Medium-deep geothermal energy mainly refers to geothermal resources existing in the strata 200 to 3,000 meters underground. The outlet temperature of these geothermal waters is usually between 25°C and 90°C, and has a high thermal energy utilization value. In order to maximize the extraction and utilization of these geothermal resources, while considering economy and efficiency, a cascade energy utilization method is generally adopted. This method uses geothermal water of different temperature ranges to meet different energy needs, thereby achieving efficient utilization of geothermal energy.

[0004] Using geothermal energy for heating is an inevitable trend for future urban development and environmental protection. Among new energy sources, geothermal energy has become the most advantageous green energy for centralized heating of urban buildings due to its stable, clean and renewable characteristics. Especially when adopting the design scheme of combining geothermal wells with heat pumps and peak-shaving heating with gas boilers, the utilization rate of geothermal energy can be as high as more than 90%. This scheme not only significantly reduces the use of geothermal water and achieves the effect of energy saving, but also greatly reduces pollution to the environment.

[0005] However, in deep geothermal centralized heating projects, when the heating end is for radiator heating (high-temperature heat users), traditional standard water source heat pump technology often cannot meet the requirements of the standard design supply and return water temperature of the radiator. For heat pump systems, COP (Coefficient of Performance) is defined as the ratio of the heat provided by the heat pump system to the electrical energy it consumes. The use of high-temperature water source heat pump groups can achieve the standard design supply and return water temperature of the radiator and meet the heating requirements, but the COP of high-temperature water source heat pump groups is low. Summary of the invention

[0006] In order to solve the problem that the high-temperature water source heat pump group in the prior art meets the heating requirements while having a low COP, the present application provides a deep geothermal temperature utilization method, product, equipment and medium.

[0007] In the first aspect, the present application provides a method for utilizing deep geothermal temperature, which adopts the following technical solution:

[0008] A method for utilizing deep geothermal temperature, comprising:

[0009] Receiving a user's heating demand, wherein the heating demand includes a first ambient temperature of a heating device and an expected ambient temperature range;

[0010] determining a flow rate of the heat exchanger in a first cycle based on the first ambient temperature, the expected ambient temperature range, and a historical heat exchange efficiency of the heat exchanger;

[0011] When the flow rate does not exceed the maximum flow rate of the heat exchanger, controlling the conveying device to convey the geothermal water output from the geothermal production well to the heat exchanger according to the flow rate;

[0012] Real-time monitoring of the outlet water temperature of the geothermal well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment;

[0013] Based on the changes in the outlet water temperature, the output temperature and the ambient temperature, a heating strategy for the second cycle is formulated, and the heating strategy for the second cycle includes: adjusting the flow of the heat exchanger, or starting a high-temperature water source heat pump group, and the high-temperature water source heat pump group includes at least two high-temperature water source heat pumps connected in series.

[0014] By adopting the above technical solution, the heat demand including the first ambient temperature of the heat-using equipment and the expected ambient temperature range is received, ensuring that the system can understand and respond to the actual needs of the user. By comprehensively considering multiple factors, including the ambient temperature, the expected temperature and the historical efficiency of the heat exchanger, the required flow rate is calculated more accurately, thereby ensuring that the heat exchange effect meets the user's needs and avoiding energy waste. When the calculated flow rate does not exceed the maximum flow rate of the heat exchanger, the conveying device is controlled to convey the geothermal water output from the geothermal exploitation well to the heat exchanger according to the flow rate, ensuring that the flow rate of the geothermal water is within a safe and efficient range, which not only meets the heat exchange demand, but also avoids damage to the heat exchanger due to excessive flow rate. The outlet water temperature of the geothermal exploitation well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment are monitored in real time, so that changes in the operating status of the system can be discovered in time. According to the temperature changes monitored in real time, the flow rate of the heat exchanger is adjusted in time, which can further optimize the heat exchange effect and ensure that the ambient temperature is stable within the expected range. Turning on the high-temperature water source heat pump group can provide additional heating capacity to ensure that the system can meet a wider range of heat needs. The series mode optimizes the performance coefficient of the high-temperature water source heat pump group.

[0015] In a preferred example, the present application can be further configured as follows: formulating a heating strategy for the second cycle based on the change of the outlet water temperature, the output temperature and the ambient temperature includes:

[0016] Determining a target temperature within a target time period from the ambient temperature change, and judging whether the target temperature is within the expected ambient temperature range, the target time period being a time period corresponding to a preset time length before the end time of the first cycle;

[0017] If the target temperature is within the expected ambient temperature range, determining the heating strategy of the second cycle as not to be adjusted;

[0018] If the target temperature is not within the expected ambient temperature range, the historical heat exchange efficiency of the heat exchanger is updated to obtain a dynamic heat exchange efficiency, and a heating strategy for the second cycle is formulated based on the dynamic heat exchange efficiency.

[0019] By adopting the above technical solution, when the target temperature is within the expected range, no adjustment is made, thus avoiding unnecessary energy waste. This intelligent control strategy helps achieve the goal of energy conservation and emission reduction; when the target temperature is not within the expected range, a new heating strategy is formulated by updating the dynamic heat exchange efficiency of the heat exchanger, which can more accurately match the current working conditions and needs, thereby improving heating efficiency and user satisfaction.

[0020] In a preferred example, the present application may be further configured as follows: formulating the heating strategy of the second cycle based on the dynamic heat exchange efficiency includes:

[0021] When the target temperature is higher than the expected ambient temperature range, the heating strategy of the second cycle is determined as: adjusting the flow rate of the heat exchanger based on the dynamic heat exchange efficiency;

[0022] When the target temperature is lower than the expected ambient temperature range, the heating strategy of the second cycle is determined as follows: determining the power of the high-temperature water source heat pump group based on the target temperature and the expected ambient temperature range, and starting the high-temperature water source heat pump group according to the power.

[0023] By adopting the above technical solution, when the target temperature is higher than the expected ambient temperature range, the output temperature can be accurately controlled by adjusting the flow of the heat exchanger so that it can be gradually reduced to the expected ambient temperature range. This adjustment method is more precise than directly shutting down or turning on the heating equipment, which helps to reduce temperature fluctuations and improve user comfort; the high-temperature water source heat pump group has a high heating efficiency and can quickly increase the ambient temperature. When the target temperature is lower than the expected ambient temperature range, the power of the high-temperature water source heat pump group is determined based on the target temperature and the expected ambient temperature range, and the high-temperature water source heat pump group is turned on according to the power, which can ensure that the ambient temperature reaches the expected range in a short time.

[0024] In a preferred example, the present application may be further configured as follows: determining the power of the high-temperature water source heat pump group based on the target temperature and the expected ambient temperature range includes:

[0025] Obtaining the historical heating efficiency of the high-temperature water source heat pump group, wherein the historical heating efficiency represents the corresponding relationship between the power of the high-temperature water source heat pump group and the ambient temperature change value caused per unit time;

[0026] Determine a first temperature difference between a median value of the expected ambient temperature range and the target temperature;

[0027] Calculate the ratio of the first temperature difference and the cycle duration to obtain a target ambient temperature change value;

[0028] The power corresponding to the target ambient temperature change value is determined from the historical heating efficiency as the power of the high-temperature water source heat pump group.

[0029] By adopting the above technical solution, the historical heating efficiency data of the high-temperature water source heat pump group is obtained, and the heating effect of the heat pump group under different powers is understood. The median of the expected ambient temperature range represents the ideal state of the ambient temperature expected to be achieved, and the target temperature is the current or expected ambient temperature. The difference between the two (the first temperature difference) is calculated to determine how much heat needs to be added to make the ambient temperature reach the expected range and avoid excessive or insufficient heating. By calculating the target ambient temperature change value and determining the power of the high-temperature water source heat pump group, the heating speed of the heat pump group can be controlled more accurately to ensure that the desired ambient temperature is reached within a limited time while avoiding energy waste.

[0030] In a preferred example, the present application may be further configured as follows: when the flow rate exceeds the maximum flow rate of the heat exchanger, the method further includes:

[0031] Controlling the conveying device to convey the geothermal water output from the geothermal production well to the heat exchanger according to the maximum flow rate;

[0032] Obtaining the historical heating efficiency of the high-temperature water source heat pump group;

[0033] Calculate the to-be-compensated temperature of the high-temperature water source heat pump group based on the expected ambient temperature range, the first ambient temperature, the flow rate and the maximum flow rate;

[0034] Calculate the ratio of the temperature to be compensated and the cycle time to obtain a temperature compensation value per unit time;

[0035] Based on the historical heating efficiency and the temperature compensation value per unit time, the power of the high-temperature water source heat pump group is determined, and the high-temperature water source heat pump group is turned on according to the determined power.

[0036] By adopting the above technical solution, the second temperature difference reflects the gap between the current ambient temperature and the expected ambient temperature, which can ensure that the flow strategy formulated subsequently can meet the needs of ambient temperature changes, thereby improving the heating or cooling efficiency of the heat exchanger. The second temperature difference is calculated by ratio with the historical heat exchange efficiency to obtain the total water requirement, which reflects how much volume of water is required to pass through the heat exchanger in order to achieve the expected ambient temperature change. By calculating the flow rate, the operating state of the heat exchanger can be accurately controlled, which takes into account both the needs of ambient temperature changes and the time factor. Therefore, it can be ensured that the heat exchanger operates at an appropriate flow rate in the first cycle, thereby improving heat exchange efficiency and reducing energy waste.

[0037] In a preferred example, the present application may be further configured as follows: the historical heat exchange efficiency represents the ambient temperature change value caused by a unit volume of water passing through the heat exchanger, and the flow rate of the heat exchanger in the first cycle is determined based on the first ambient temperature, the expected ambient temperature range and the historical heat exchange efficiency of the heat exchanger, including:

[0038] Calculating a second temperature difference between a median value of the expected ambient temperature range and the first ambient temperature;

[0039] Calculating the ratio of the second temperature difference to the historical heat exchange efficiency to obtain the total water requirement;

[0040] The flow rate of the heat exchanger in the first cycle is obtained by calculating the ratio of the total water demand and the cycle duration.

[0041] By adopting the above technical solution, during the continuous operation process, any cycle after the first cycle is regarded as the current cycle, which ensures the continuity of the heating strategy and the possibility of dynamic adjustment, so that the system can adapt to the changing environment and equipment status, collect the changes in ambient temperature and equipment conditions in the current cycle, and respond to environmental changes and equipment status changes in a timely manner, thereby improving the accuracy and effectiveness of the heating strategy.

[0042] In a preferred example, the present application can be further configured as follows: the method further includes:

[0043] For any cycle after the first cycle, taking the any cycle as the current cycle;

[0044] Acquire the current ambient temperature change and equipment operating conditions within the current cycle, wherein the equipment operating conditions include at least one of the current flow rate of the heat exchanger and the current power of the high-temperature water source heat pump group;

[0045] Based on the current ambient temperature change and the equipment operating conditions, the heating strategy for the next cycle of the current cycle is determined, and the heating strategy for the next cycle includes: determining the flow rate of the heat exchanger in the next cycle, or determining the power of the high-temperature water source heat pump group in the next cycle.

[0046] By adopting the above technical solution, when the flow exceeds the maximum flow of the heat exchanger, in order to avoid equipment overload or damage, it is necessary to control the delivery device to limit the flow of geothermal water within the maximum flow range of the heat exchanger, protect the heat exchanger from overload damage, ensure stable operation of the system, calculate the temperature value that needs to be compensated by the high-temperature water source heat pump group, calculate the ratio of the temperature to be compensated and the cycle duration, and obtain the temperature value that needs to be compensated per unit time, to ensure that the high-temperature water source heat pump group can provide the required heating compensation evenly and stably within a given time, and calculate and determine the power required by the high-temperature water source heat pump group based on the historical heating efficiency and the temperature compensation value per unit time, to ensure that the high-temperature water source heat pump group operates at an appropriate power, which not only meets the heating demand but also avoids energy waste and equipment overload.

[0047] In a second aspect, the present application provides a computer program product, which adopts the following technical solution:

[0048] A computer program product includes a computer program. When the computer program is executed by a processor, it implements the deep geothermal temperature utilization method as described in any one of the first aspects.

[0049] In a third aspect, the present application provides an electronic device, which adopts the following technical solution:

[0050] one or more processors;

[0051] Memory;

[0052] At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, and the at least one application is configured to: execute the deep geothermal temperature utilization method as described in any one of the first aspects.

[0053] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0054] A computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute the deep geothermal temperature utilization method as described in any one of the first aspects.

[0055] In summary, this application includes the following beneficial technical effects:

[0056] The present application ensures that the system can understand and respond to the actual needs of the user by receiving the heat demand including the first ambient temperature of the heat-using equipment and the expected ambient temperature range. By comprehensively considering multiple factors, including the ambient temperature, the expected temperature and the historical efficiency of the heat exchanger, the required flow rate is calculated more accurately, thereby ensuring that the heat exchange effect meets the user's needs and avoiding energy waste. When the calculated flow rate does not exceed the maximum flow rate of the heat exchanger, the conveying device is controlled to convey the geothermal water output from the geothermal exploitation well to the heat exchanger according to the flow rate, ensuring that the flow rate of the geothermal water is within a safe and efficient range, which not only meets the heat exchange demand, but also avoids damage to the heat exchanger due to excessive flow rate. The outlet water temperature of the geothermal exploitation well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment are monitored in real time, so that changes in the operating state of the system can be discovered in time. According to the temperature changes monitored in real time, the flow rate of the heat exchanger is adjusted in time, which can further optimize the heat exchange effect and ensure that the ambient temperature is stable within the expected range. Turning on the high-temperature water source heat pump group can provide additional heating capacity to ensure that the system can meet a wider range of heat needs. The series mode optimizes the performance coefficient of the high-temperature water source heat pump group. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a structural schematic diagram of a deep geothermal temperature utilization system provided in an embodiment of the present application;

[0058] Figure 2 It is a flow chart of a method for utilizing deep geothermal temperature provided in an embodiment of the present application;

[0059] Figure 3 This is an index comparison diagram of a series-parallel mode of a high-temperature water source heat pump provided in an embodiment of the present application;

[0060] Figure 4 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0062] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0065] It should be noted that in the optional embodiments of the present application, the object information and other related data involved, when the embodiments in the present application are applied to specific products or technologies, need to obtain the permission or consent of the object, and the collection, use and processing of the relevant data need to comply with the relevant laws, regulations and standards of the relevant countries and regions. In other words, if the embodiments of the present application involve data related to the object, it needs to be obtained with the authorization and consent of the object, the authorization and consent of the relevant departments, and in compliance with the relevant laws, regulations and standards of the country and region. If personal information is involved in the embodiments, the acquisition of all personal information needs to obtain the consent of the individual. If sensitive information is involved, the separate consent of the information subject needs to be obtained. The embodiments also need to be implemented with the authorization and consent of the object.

[0066] See also Figure 1 , which shows a structural schematic diagram of a deep geothermal temperature utilization system provided by an embodiment of the present application. The system includes: a geothermal production well, a heat exchanger, a heat-using device, an intermediate heat exchanger, a high-temperature water source heat pump group and a geothermal reinjection well.

[0067] Among them, geothermal extraction wells extend into the ground, and high-temperature geothermal water is extracted from underground and transported to the heat exchanger. The heat exchanger and the intermediate heat exchanger are both used to exchange heat. The heat exchanger can transfer the heat in the geothermal water to the working fluid (such as water) in the heat-using equipment (such as heating) to complete direct heat exchange. The high-temperature geothermal water in the heat exchanger loses heat and the temperature decreases, while the working fluid absorbs heat and the temperature increases. After direct heat exchange, the high-temperature geothermal water in the heat exchanger decreases in temperature and becomes medium-temperature geothermal water. The medium-temperature geothermal water can be transferred to the intermediate heat exchanger. The intermediate heat exchanger further transfers the heat in the medium-temperature geothermal water to the high-temperature water source heat pump group (including two high-temperature water source heat pumps connected in series, i.e. Figure 1The medium- and high-temperature water source heat pump 1 and the high-temperature water source heat pump 2) output low-temperature geothermal water. The high-temperature water source heat pump group absorbs the heat in the medium-temperature geothermal water and further heats it, and delivers the working fluid heated by the heat pump to the heat-using equipment. The low-temperature geothermal water output by the intermediate heat exchanger is delivered to the geothermal recharge well, which is used to re-inject the geothermal water that has undergone heat exchange into the ground to maintain the sustainable use of heat resources.

[0068] The heat exchanger can be a plate heat exchanger, which 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. Plate heat exchangers are ideal equipment for liquid-liquid heat exchange, with 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 tubular heat exchangers, and the footprint is one-third of that of tubular heat exchangers, and the heat recovery rate can be as high as 90% or more. The heat exchanger can directly transfer the heat of high-temperature geothermal water to high-temperature heat users in a timely manner, effectively ensuring the heating needs of high-temperature heat users; and timely transfer medium and high-temperature geothermal water to the intermediate circulation system on the side of the high-temperature heat pump evaporator, effectively ensuring the long-term stable operation and use of the high-temperature water source heat pump group.

[0069] The parameter selection of the high-temperature water source heat pump group can be: Brand: Trane, Model: SLHB205MD-FO, Quantity: 2 units, Performance parameters: Unit SLHB205MD-FO, Q=2450KW, P=640KW, Inlet and outlet water temperature on the evaporator side is 28 / 13℃, and Inlet and outlet water temperature on the condenser side is 45 / 60℃.

[0070] The present application embodiment provides a method for utilizing deep geothermal temperature, such as Figure 2 As shown, the method provided in the embodiment of the present application is executed by an electronic device, which can be a server or a terminal device, wherein the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The terminal device can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. The terminal device and the server can be directly or indirectly connected via wired or wireless communication, which is not limited in the embodiment of the present application. The method includes steps S201 to S205, wherein:

[0071] S201. Receive a user's heating demand, where the heating demand includes a first ambient temperature of a heating device and an expected ambient temperature range.

[0072] Specifically, the electronic device receives the heat demand input by the user through an interface (such as a touch screen, a mobile phone app), the heat-using device may be a heater, the first ambient temperature may represent the indoor temperature, and the expected ambient temperature range represents the ambient temperature range that the user expects to achieve.

[0073] S202: Determine the flow rate of the heat exchanger in the first cycle based on the first ambient temperature, the expected ambient temperature range, and the historical heat exchange efficiency of the heat exchanger.

[0074] Specifically, the historical heat exchange efficiency represents the ambient temperature change value caused by a unit volume of water passing through the heat exchanger, and is determined as follows: multiple heating data are obtained, each heating data includes the total water volume passing through the heat exchanger and the temperature change caused; for any heating data, the ratio of the temperature change to the total water volume in the heating data is calculated to obtain the historical heat exchange efficiency of the heating data; the average value of the historical heat exchange efficiencies of multiple heating data is calculated to obtain the historical heat exchange efficiency of the heat exchanger.

[0075] The purpose of heating is to keep the ambient temperature within the expected ambient temperature range. The best state is when the ambient temperature is stable near the median of the expected ambient temperature range. The difference between the median of the expected ambient temperature range and the first ambient temperature is calculated as the second temperature difference. The ratio of the second temperature difference and the historical heat exchange efficiency is calculated to obtain the total amount of water passing through the heat exchanger in the first cycle, which is recorded as the total water demand. The cycle duration can be set based on experience, and the heating strategy for the next cycle is determined at the end of each cycle. The ratio of the total water demand and the cycle duration is calculated to obtain the flow rate of the heat exchanger in the first cycle (the volume of liquid flowing through the heat exchanger per unit time) so that the ambient temperature reaches the expected ambient temperature after the first cycle.

[0076] S203. When the flow rate does not exceed the maximum flow rate of the heat exchanger, the conveying device is controlled to convey the geothermal water output from the geothermal production well to the heat exchanger according to the flow rate.

[0077] The maximum flow rate of the heat exchanger can be determined according to the factory properties of the heat exchanger, and the obtained flow rate of the heat exchanger is compared with the maximum flow rate of the heat exchanger.

[0078] In one possible situation, the flow rate exceeds the maximum flow rate of the heat exchanger. At this time, the delivery device (such as a water pump) can be controlled to deliver the geothermal water output from the geothermal extraction well to the heat exchanger at the maximum flow rate, and the power of the high-temperature water source heat pump group can be determined based on the flow rate and the maximum flow rate, and the high-temperature water source heat pump group can be started according to the determined power.

[0079] In another possible situation, the flow rate does not exceed the maximum flow rate of the heat exchanger. In this case, the conveying device can be controlled to convey the geothermal water output from the geothermal production well to the heat exchanger according to the determined flow rate.

[0080] For flow regulation, electric two-way regulating valves can be used. The electric two-way regulating valve series can regulate the flow of steam or hot and cold water, and is widely used in fluid control of systems such as central air conditioning, heating, and industrial processing industries. The electric two-way temperature regulating valve adopts a double valve core upper and lower guide structure, equipped with an electric actuator mechanism, and the valve body is a two-way structure, that is, one in and one out, so as to achieve fluid mixing and heating or cooling, or unequal fluid diversion, to meet the use requirements of different working conditions. The valve body of the electric two-way temperature regulating valve has the advantages of compact structure, light weight, sensitive action, small pressure drop loss, large valve capacity, accurate flow characteristics and convenient maintenance. It can be used for various working conditions, especially for the temperature control system and automatic control system of heat exchangers. It is necessary to select the appropriate valve flow capacity CV value according to the existing hydraulic pipeline system model, and provide the design instructions of the electric two-way regulating valve, and perform the opening verification of the electric regulating valve and the actual adjustable ratio verification to meet long-term use and maintain the accuracy of signal transmission.

[0081] S204, real-time monitoring of the outlet water temperature of the geothermal well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment.

[0082] Specifically, sensors installed near geothermal extraction wells, heat exchangers and heat-using equipment are used to collect changes in outlet water temperature, output temperature and ambient temperature in real time.

[0083] The temperature sensor can be a temperature transmitter. It should be selected based on the existing hydraulic pipeline system model, whether the temperature of the object to be measured needs to be recorded, alarmed and automatically controlled, whether remote distance measurement and transmission is required, and whether the lag of the temperature measurement software is suitable for the temperature measurement requirements when the temperature of the object to be measured changes over time.

[0084] S205. Based on the changes in the outlet water temperature, the output temperature and the ambient temperature, a heating strategy for the second cycle is formulated. The heating strategy for the second cycle includes: adjusting the flow of the heat exchanger, or starting a high-temperature water source heat pump group, which includes at least two high-temperature water source heat pumps connected in series.

[0085] Specifically. Based on the changes in ambient temperature, the heating effect in the first cycle can be evaluated. If the ambient temperature reaches the expected ambient temperature range, the heating strategy in the second cycle will be determined without adjustment. If the ambient temperature does not meet the expected ambient temperature range, a heating strategy for the second cycle is formulated based on the changes in the outlet water temperature, output temperature and ambient temperature. The heating effect can be changed by adjusting the flow of the conveying device. If simply adjusting the flow cannot meet the heating demand, the high-temperature water source heat pump group can be further turned on to improve the heating efficiency.

[0086] A possible implementation of the embodiment of the present application is to formulate a heating strategy for the second cycle based on the changes in the outlet water temperature, the output temperature and the ambient temperature, including:

[0087] Determine a target temperature within a target time period from the ambient temperature change, and judge whether the target temperature is within an expected ambient temperature range, the target time period being a time period corresponding to a preset time length before the end time of the first cycle;

[0088] If the target temperature is within the expected ambient temperature range, the heating strategy for the second cycle is determined as not to be adjusted;

[0089] If the target temperature is not within the expected ambient temperature range, the historical heat exchange efficiency of the heat exchanger is updated to obtain the dynamic heat exchange efficiency, and a heating strategy for the second cycle is formulated based on the dynamic heat exchange efficiency.

[0090] In this embodiment, the ambient temperature change includes the ambient temperature at each moment in the first cycle. The target time period can be selected as the half an hour before the end of the first cycle. The target temperature represents the average value of the ambient temperature at each moment in the target time period. The target temperature is compared with the expected ambient temperature range. If the target temperature is within the preset ambient temperature range, it indicates that the heating effect in the first cycle has reached the expected level. At this time, the heating strategy of the second cycle is not adjusted, that is, the flow rate of the heat exchanger in the first cycle is kept unchanged.

[0091] If there is an ambient temperature in the target temperature that is not within the preset ambient temperature range, it means that the heating effect in the first cycle has not met expectations. The difference between the target temperature and the midpoint of the preset ambient temperature range is calculated. If the difference is greater than zero, it indicates overheating, and if the difference is less than zero, it indicates insufficient heating. Furthermore, the dynamic heat exchange efficiency is:

[0092] Among them, the difference between the median of the preset ambient temperature range and the first ambient temperature is the expected heating effect, the difference between the target temperature and the first ambient temperature is the actual heating effect achieved, and the dynamic heat exchange efficiency represents the actual heat exchange efficiency of the heat exchanger in the first cycle.

[0093] A possible implementation of the embodiment of the present application is to formulate a heating strategy for the second cycle based on the dynamic heat exchange efficiency, including:

[0094] When the target temperature is higher than the expected ambient temperature range, the heating strategy for the second cycle is determined as follows: adjusting the flow rate of the heat exchanger based on the dynamic heat exchange efficiency;

[0095] When the target temperature is lower than the expected ambient temperature range, the heating strategy for the second cycle is determined as follows: the power of the high-temperature water source heat pump group is determined based on the target temperature and the expected ambient temperature range, and the high-temperature water source heat pump group is turned on according to the power.

[0096] In this embodiment, the target temperature is higher than the expected ambient temperature range, indicating excessive heating. In this case, the heating can be reduced by reducing the flow of the heat exchanger. The adjusted flow rate = the flow rate before adjustment × historical heat exchange efficiency / dynamic heat exchange efficiency.

[0097] When the target temperature is lower than the expected ambient temperature range, it indicates insufficient heating. At this time, the high-temperature water source heat pump group can be turned on to increase heating.

[0098] A possible implementation of the embodiment of the present application is to determine the power of the high-temperature water source heat pump group based on the target temperature and the expected ambient temperature range, including:

[0099] Obtain the historical heating efficiency of the high-temperature water source heat pump group, which represents the corresponding relationship between the power of the high-temperature water source heat pump group and the ambient temperature change value caused per unit time;

[0100] Determine a first temperature difference between a midpoint of an expected ambient temperature range and a target temperature;

[0101] Calculate the ratio of the first temperature difference and the cycle duration to obtain the target ambient temperature change value;

[0102] The power corresponding to the target ambient temperature change value is determined from the historical heating efficiency as the power of the high-temperature water source heat pump group.

[0103] In this embodiment, the insufficient heating of the heat exchanger is compensated by starting the high-temperature water source heat pump group and calculating the power.

[0104] In a possible implementation of the embodiment of the present application, the historical heat exchange efficiency represents the ambient temperature change value caused by a unit volume of water passing through the heat exchanger, and based on the first ambient temperature, the expected ambient temperature range and the historical heat exchange efficiency of the heat exchanger, the flow rate of the heat exchanger in the first cycle is determined, including:

[0105] calculating a second temperature difference between a median of the expected ambient temperature range and the first ambient temperature;

[0106] The total water requirement is obtained by calculating the ratio of the second temperature difference and the historical heat exchange efficiency;

[0107] The ratio of the total water demand and the cycle duration is calculated to obtain the flow rate of the heat exchanger in the first cycle.

[0108] In a possible implementation manner of the embodiment of the present application, the method further includes:

[0109] For any cycle after the first cycle, any cycle is taken as the current cycle;

[0110] Obtaining the current ambient temperature change and equipment operating conditions in the current cycle, where the equipment operating conditions include at least one of the current flow of the heat exchanger and the current power of the high-temperature water source heat pump group;

[0111] Based on the current ambient temperature changes and equipment operating conditions, determine the heating strategy for the next cycle of the current cycle. The heating strategy for the next cycle includes: determining the flow rate of the heat exchanger in the next cycle, or determining the power of the high-temperature water source heat pump group in the next cycle.

[0112] In this embodiment, the flow adjustment difference and the power adjustment difference can be preset, and after obtaining the current ambient temperature change, the average temperature of the last period of time (the duration can be equal to the target period) in the current cycle is calculated to determine whether the average temperature is within the expected ambient temperature range. There may be two equipment conditions in the current cycle. The first equipment condition is that only the heat exchanger is turned on, and the second equipment condition is that both the heat exchanger and the high-temperature water source heat pump group are turned on.

[0113] For the first equipment condition, only the heat exchanger is turned on. If the average temperature obtained is within the expected ambient temperature range, the heating strategy for the next cycle is determined to be not adjusting the heat exchanger flow; if the average temperature obtained is lower than the minimum value of the expected ambient temperature range, the heating strategy for the next cycle is to increase the flow of the heat exchanger by the flow adjustment difference; if the average temperature obtained is higher than the maximum value of the expected ambient temperature range, the heating strategy for the next cycle is to reduce the flow by the flow adjustment difference.

[0114] For the second equipment condition, the heat exchanger and the high-temperature water source heat pump group are both turned on. If the obtained average temperature is within the expected ambient temperature range, the heating strategy for the next cycle is determined as not adjusting the heat exchanger flow and the high-temperature water source heat pump group power; if the obtained average temperature is lower than the minimum value of the expected ambient temperature range, the heating strategy for the next cycle is to increase the flow of the heat exchanger by the flow adjustment difference and / or increase the power of the high-temperature water source heat pump group by the power adjustment difference; if the obtained average temperature is higher than the maximum value of the ambient temperature range, the heating strategy for the next cycle is to reduce the power of the high-temperature water source heat pump group by the power adjustment difference. If the average temperature determined for multiple consecutive cycles is higher than the maximum value of the expected ambient temperature range, the power of the high-temperature water source heat pump group is repeatedly reduced by the power adjustment difference until the high-temperature water source heat pump group is turned off. At this time, if the determined average temperature is still higher than the expected maximum value of the ambient temperature, the heating strategy for the next cycle is to reduce the flow by the flow adjustment difference.

[0115] In a possible implementation of the embodiment of the present application, when the flow rate exceeds the maximum flow rate of the heat exchanger, the method further includes:

[0116] Controlling the conveying device to convey the geothermal water output from the geothermal production well to the heat exchanger according to the maximum flow rate;

[0117] Obtain the historical heating efficiency of the high-temperature water source heat pump group;

[0118] Calculate the temperature to be compensated of the high-temperature water source heat pump group based on the expected ambient temperature range, the first ambient temperature, the flow rate and the maximum flow rate;

[0119] Calculate the ratio of the temperature to be compensated and the cycle time to obtain the temperature compensation value per unit time;

[0120] Based on the historical heating efficiency and the temperature compensation value per unit time, the power of the high-temperature water source heat pump group is determined, and the high-temperature water source heat pump group is turned on according to the power.

[0121] In this embodiment, the historical heating efficiency characterizes the corresponding relationship between the power of the high-temperature water source heat pump group and the ambient temperature change value caused per unit time. Calculate (the median of the expected ambient temperature range - the first ambient temperature) × (flow rate - maximum flow rate) / maximum flow rate, and the result is the temperature value that needs to be compensated by the high-temperature water source heat pump group as the temperature to be compensated. Calculate the ratio of the temperature to be compensated and the cycle length. The value obtained represents the ambient temperature change value that the high-temperature water source heat pump group needs to compensate for per unit time. Find the power corresponding to the ambient temperature change value that the high-temperature water source heat pump group needs to compensate for per unit time in the historical heating efficiency as the power of the high-temperature water source heat pump group in the first cycle.

[0122] For example, in the winter working conditions of the 2022 heating season, after the construction of the original deep geothermal high-temperature heat pump parallel system of this project is completed, the terminal form of building heating is a radiator. Under heating conditions, the project area can meet the total design heat load requirements of the building by combining the cascade utilization of geothermal resources with the high-temperature water source heat pump parallel technology. Among them: the re-injection water temperature of the heating heat pump parallel process is 15 degrees, the intermediate heat exchange temperature difference is 15 degrees, and the comprehensive COP=3.83.

[0123] After actual operation in the 2022-2023 heating season, the metering data are as follows: the water pump operating power is 277.5kwh; the heat pump operating power is 1280kwh; the total operating power of the geothermal high-temperature heat pump parallel system is 1557.5kw. The water pump operating cost is 548,000 yuan; the heat pump operating cost is 2.133 million yuan; the total operating cost of the geothermal high-temperature heat pump parallel system is 2.681 million yuan. The original deep geothermal high-temperature heat pump parallel mode - winter heating, the operating cost per square meter is 11.2 yuan / square meter.

[0124] The deep geothermal temperature utilization method provided in this application is used for operation. In the actual operation in the 2023-2024 heating season (November 15, 2023-March 15, 2024), the metering data are as follows: the water pump operating power is 284.5kwh; the heat pump operating power is 1111kwh; the total operating power of the geothermal high-temperature heat pump parallel system is 1395.5kw. The water pump operating cost is 562,500 yuan; the heat pump operating cost is 1.851 million yuan; the total operating cost of the geothermal high-temperature heat pump parallel system is 2.413 million yuan. Using the deep geothermal high-temperature heat pump series technology-winter heating process, the operating cost per square meter is 10.1 yuan / square meter.

[0125] Among them: the re-injection water temperature of the parallel process of the heating heat pump is 15 degrees, the intermediate heat exchange temperature difference is 11.7 degrees, and the comprehensive COP=4.37.

[0126] It can be seen that in deep geothermal heating projects, when heating the radiator end (high-temperature heat users), when the standard design supply and return water temperature of the radiator is reached, the problem of low COP when the high-temperature heat pump is conventionally connected in parallel can be perfectly solved, and ultimately the COP of the geothermal heating system will be higher, and the heating at the radiator end (high-temperature users) can fully reach the standard design temperature, which will save certain operating costs for the heating operation.

[0127] The new technology provided in this application has a low application cost, because only the pipes between the intermediate heat exchanger plate and the high-temperature water source heat pump of the original parallel system are modified, and the system will be widely used; if the cost of use is too high, it cannot be used on a large scale, and the original intention of developing the system: to improve the system operation COP, reduce operating costs, and ensure the designed supply and return water temperature at the high-temperature heating end of the radiator, and the improved economic benefits will be meaningless.

[0128] The technical and economic indicators of the high-temperature water source heat pump series connection proposed in this application compared with the traditional parallel connection are compared. Figure 3 As shown. The original high-temperature water source heat pump parallel mode: the comprehensive COP is medium, the operating cost is medium, but the operation is relatively convenient. The high-temperature water source heat pump series mode: the comprehensive COP is the highest, the operating cost is the lowest, but the operation and management are somewhat inconvenient, and the skills of the operation and management personnel need to be improved to overcome. Therefore, the high-temperature water source heat pump series mode is the optimal solution. The deep geothermal temperature utilization method proposed in this application will make the COP of the geothermal heating system higher, save a certain amount of operating costs for the heating operation, and make the operation of deep geothermal centralized heating more perfect.

[0129] An embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the contents shown in the aforementioned deep geothermal temperature utilization method embodiment are implemented.

[0130] An electronic device is provided in an embodiment of the present application, such as Figure 4 As shown, Figure 4 The electronic device 400 shown includes: a processor 401 and a memory 403. The processor 401 and the memory 403 are connected, such as through a bus 402. Optionally, the electronic device 400 may also include a transceiver 404. It should be noted that in actual applications, the transceiver 404 is not limited to one, and the structure of the electronic device 400 does not constitute a limitation on the embodiments of the present application.

[0131] Processor 401 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. Processor 401 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0132] The bus 402 may include a path to transmit information between the above components. The bus 402 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 402 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but it does not mean that there is only one bus or only one type of bus.

[0133] The memory 403 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0134] The memory 403 is used to store the application code for executing the solution of the present application, and the execution is controlled by the processor 401. The processor 401 is used to execute the application code stored in the memory 403 to implement the contents shown in the above-mentioned deep geothermal temperature utilization method embodiment.

[0135] Figure 4 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0136] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer-readable storage medium is run on a computer, the computer can execute the contents shown in the aforementioned deep geothermal temperature utilization method embodiment.

[0137] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0138] The above are only some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for utilizing deep geothermal temperature, characterized in that: include: Receiving a user's heating demand, wherein the heating demand includes a first ambient temperature of a heating device and an expected ambient temperature range; determining a flow rate of the heat exchanger in a first cycle based on the first ambient temperature, the expected ambient temperature range, and a historical heat exchange efficiency of the heat exchanger; When the flow rate does not exceed the maximum flow rate of the heat exchanger, controlling the conveying device to convey the geothermal water output from the geothermal production well to the heat exchanger according to the flow rate; Real-time monitoring of the outlet water temperature of the geothermal well, the output temperature of the heat exchanger, and the ambient temperature changes of the heat-using equipment; Based on the changes in the outlet water temperature, the output temperature and the ambient temperature, a heating strategy for the second cycle is formulated, wherein the heating strategy for the second cycle includes: adjusting the flow of the heat exchanger, or starting a high-temperature water source heat pump group, wherein the high-temperature water source heat pump group includes at least two high-temperature water source heat pumps connected in series; When the flow rate exceeds the maximum flow rate of the heat exchanger, the method further comprises: Controlling the conveying device to convey the geothermal water output from the geothermal production well to the heat exchanger according to the maximum flow rate; Obtaining the historical heating efficiency of the high-temperature water source heat pump group, wherein the historical heating efficiency represents the corresponding relationship between the power of the high-temperature water source heat pump group and the ambient temperature change value caused per unit time; Calculate the to-be-compensated temperature of the high-temperature water source heat pump group based on the expected ambient temperature range, the first ambient temperature, the flow rate and the maximum flow rate; Calculate the ratio of the temperature to be compensated and the cycle time to obtain a temperature compensation value per unit time; Based on the historical heating efficiency and the temperature compensation value per unit time, determining the power of the high-temperature water source heat pump group, and starting the high-temperature water source heat pump group according to the determined power; The historical heat exchange efficiency represents the ambient temperature change value caused by a unit volume of water passing through the heat exchanger, and the flow rate of the heat exchanger in the first cycle is determined based on the first ambient temperature, the expected ambient temperature range and the historical heat exchange efficiency of the heat exchanger, including: Calculating a second temperature difference between a median value of the expected ambient temperature range and the first ambient temperature; Calculating the ratio of the second temperature difference to the historical heat exchange efficiency to obtain the total water requirement; The flow rate of the heat exchanger in the first cycle is obtained by calculating the ratio of the total water demand and the cycle duration.

2. The deep geothermal temperature utilization method according to claim 1, characterized in that: The formulating of a heating strategy for the second cycle based on the change of the outlet water temperature, the output temperature and the ambient temperature includes: Determining a target temperature within a target time period from the ambient temperature change, and judging whether the target temperature is within the expected ambient temperature range, the target time period being a time period corresponding to a preset time length before the end time of the first cycle; If the target temperature is within the expected ambient temperature range, determining the heating strategy of the second cycle as not to be adjusted; If the target temperature is not within the expected ambient temperature range, the historical heat exchange efficiency of the heat exchanger is updated to obtain a dynamic heat exchange efficiency, and a heating strategy for the second cycle is formulated based on the dynamic heat exchange efficiency.

3. The deep geothermal temperature utilization method according to claim 2, characterized in that: The formulating the heating strategy of the second cycle based on the dynamic heat exchange efficiency includes: When the target temperature is higher than the expected ambient temperature range, the heating strategy of the second cycle is determined as: adjusting the flow rate of the heat exchanger based on the dynamic heat exchange efficiency; When the target temperature is lower than the expected ambient temperature range, the heating strategy of the second cycle is determined as follows: determining the power of the high-temperature water source heat pump group based on the target temperature and the expected ambient temperature range, and starting the high-temperature water source heat pump group according to the power.

4. The deep geothermal temperature utilization method according to claim 3, characterized in that: The step of determining the power of the high-temperature water source heat pump group based on the target temperature and the expected ambient temperature range includes: Obtaining the historical heating efficiency of the high-temperature water source heat pump group; Determine a first temperature difference between a median value of the expected ambient temperature range and the target temperature; Calculate the ratio of the first temperature difference and the cycle duration to obtain a target ambient temperature change value; The power corresponding to the target ambient temperature change value is determined from the historical heating efficiency as the power of the high-temperature water source heat pump group.

5. The deep geothermal temperature utilization method according to claim 1, characterized in that: The method further comprises: For any cycle after the first cycle, taking the any cycle as the current cycle; Acquire the current ambient temperature change and equipment operating conditions within the current cycle, wherein the equipment operating conditions include at least one of the current flow rate of the heat exchanger and the current power of the high-temperature water source heat pump group; Based on the current ambient temperature change and the equipment operating conditions, the heating strategy for the next cycle of the current cycle is determined, and the heating strategy for the next cycle includes: determining the flow rate of the heat exchanger in the next cycle, or determining the power of the high-temperature water source heat pump group in the next cycle.

6. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the steps of the deep geothermal temperature utilization method described in any one of claims 1-5.

7. An electronic device, characterized in that: include: at least one processor; Memory; At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, and the at least one application is configured to: execute the deep geothermal temperature utilization method described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed in a computer, the computer is caused to execute the deep geothermal temperature utilization method described in any one of claims 1-5.

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