Heat exchange medium flow control method and device

Abstract

The present application provides a flow control method and device for a heat exchange medium, the flow control method for the heat exchange medium includes: after the heat exchange process is started, obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperature, and the molten salt inlet and outlet temperature; calculating the molten salt demand flow according to the heat transfer oil flow, the heat transfer oil inlet and outlet temperature, and the molten salt inlet and outlet temperature; sending a control signal to the regulating valve according to the demand flow, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow. That is, for the heat exchange process of two different working fluids, the flow matching problem is reasonably controlled, and the control method of one medium flow following the other medium flow is used to realize the conversion from multiple control quantities to single control quantity control, so as to solve the technical problems of poor control accuracy and low heat exchange efficiency in the heat exchange process.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology in power plants, and in particular to a flow control method and device for a heat exchange medium, an electronic device, and a storage medium. Background Art

[0002] At present, in most power stations and refrigeration heat exchange stations, constant flow is adopted on both sides or variable flow control is used on one side during the heat exchange process. In the heat exchange process, the matching of the two medium flows is manually adjusted, which not only requires a large amount of operation and a lot of information, but also is difficult to adjust to the best matching flow. If the adjustment is improper, it is very easy to cause energy loss or thermal shock of the heat exchanger body. In severe cases, it may cause system tripping or heat exchanger damage, poor control accuracy and low heat exchange efficiency. Summary of the invention

[0003] The embodiment of the present application provides a method for controlling the flow rate of a heat exchange medium to solve the technical problems in the prior art of poor control accuracy and low heat exchange efficiency during the heat exchange process.

[0004] According to a first aspect of an embodiment of the present application, a method for controlling the flow of a heat exchange medium is provided, comprising: after the heat exchange process is started, obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt; calculating the required flow of the molten salt according to the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt; and sending a control signal to a regulating valve according to the required flow, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow.

[0005] Further, the calculating the required flow rate of the molten salt according to the heat transfer oil flow rate, the inlet and outlet temperatures of the heat transfer oil and the inlet and outlet temperatures of the molten salt includes: calculating the required flow rate of the molten salt in the following manner:

[0006] Among them, F cold salts Indicates the calculated required flow rate of the molten salt, F HTF represents the heat transfer oil flow rate, T1 represents the heat transfer oil inlet temperature, T2 represents the heat transfer oil outlet temperature, T4 represents the outlet hot molten salt temperature, T3 represents the inlet cold molten salt temperature, C pHTF Indicates the specific heat capacity of the heat transfer oil, C psalts represents the specific heat capacity of molten salt.

[0007] Furthermore, after the heat exchange process is started, before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt, the method also includes: after the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the oil side will establish the initial flow, and the start of the heat exchange process is determined.

[0008] Furthermore, after the heat exchange process is started, before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the method also includes: obtaining the lighting conditions in the environment; when the lighting conditions change by more than a predetermined threshold, starting the heat exchange mode; after the heat exchange mode is started, starting the heat exchange process.

[0009] Furthermore, after obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt, the method also includes: obtaining a first difference between the heat transfer oil inlet and outlet temperatures and a first preset temperature, and a second difference between the inlet and outlet temperatures of the molten salt and a second preset temperature; and determining the life parameters of the oil-salt heat exchanger based on the first difference and the second difference.

[0010] According to a second aspect of an embodiment of the present application, a flow control device for a heat exchange medium is provided, comprising: a first acquisition unit, for acquiring the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started; a calculation unit, for calculating the required flow rate of the molten salt according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt; and a sending unit, for sending a control signal to a regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate.

[0011] Furthermore, the calculation unit includes: a calculation module, which is used to calculate the required flow rate of the molten salt in the following manner:

[0012] Among them, F cold salts Indicates the calculated required flow rate of the molten salt, F HTF represents the heat transfer oil flow rate, T1 represents the heat transfer oil inlet temperature, T2 represents the heat transfer oil outlet temperature, T4 represents the outlet hot molten salt temperature, T3 represents the inlet cold molten salt temperature, C pHTF Indicates the specific heat capacity of the heat transfer oil, C psalts represents the specific heat capacity of molten salt.

[0013] Furthermore, the device also includes: a first determination unit, which is used to obtain the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started. After the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, and the initial flow will be established on the oil side to determine that the heat exchange process is started.

[0014] Furthermore, the device also includes: a second acquisition unit, used to obtain the lighting conditions in the environment before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started; a first starting unit, used to start the heat exchange mode when the light condition changes by more than a predetermined threshold; and a second starting unit, used to start the heat exchange process after the heat exchange mode is started.

[0015] Furthermore, the device also includes: a third acquisition unit, which is used to obtain a first difference between the inlet and outlet temperatures of the thermal oil and a first preset temperature, and a second difference between the inlet and outlet temperatures of the molten salt and a second preset temperature after obtaining the thermal oil flow rate, the inlet and outlet temperatures of the thermal oil, and the inlet and outlet temperatures of the molten salt; and a second determination unit, which is used to determine the life parameters of the oil-salt heat exchanger based on the first difference and the second difference.

[0016] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, characterized in that a computer program is stored in the storage medium, wherein the computer program is configured to execute the above-mentioned heat exchange medium flow control method when running.

[0017] According to a fourth aspect of an embodiment of the present application, there is provided an electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the above-mentioned heat exchange medium flow control method.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In the present invention, the flow matching problem is reasonably controlled in the heat exchange process of two different working fluids. A control method in which the flow of one medium follows the flow of another medium is adopted to realize the conversion from multiple controlled quantities to single controlled quantity control, thereby solving the technical problems of poor control accuracy and low heat exchange efficiency in the heat exchange process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a hardware structure block diagram of a mobile terminal of an optional heat exchange medium flow control method according to an embodiment of the present invention;

[0022] Figure 2 is a flow chart of an optional heat exchange medium flow control method according to an embodiment of the present invention;

[0023] Figure 3 is a flow chart of an optional flow ratio control method in a heat exchange process with different working fluids according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of an optional flow ratio control system in a heat exchange process with different working fluids according to an embodiment of the present invention;

[0025] Figure 5 is a flow chart of an optional salt side flow regulation according to an embodiment of the present invention;

[0026] Figure 6 is a flow chart of an optional heat transfer oil side flow regulation according to an embodiment of the present invention;

[0027] Figure 7 It is a structural diagram of an optional flow control device for heat exchange medium according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a sequence of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The heat exchange medium flow control method embodiment provided in the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a heat exchange medium flow control method according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal 10 may include one or more ( Figure 1Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Optionally, the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0031] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the flow control method of the heat exchange medium in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0032] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal 10. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a method for controlling the flow rate of a heat exchange medium is also provided. Figure 2 : is a flow chart of a method for controlling the flow rate of a heat exchange medium according to an embodiment of the present invention. Figure 2 As shown, the flow control method of the heat exchange medium includes the following steps:

[0034] Step S202, after the heat exchange process is started, the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures are obtained.

[0035] Step S204, calculating the required flow rate of molten salt according to the heat transfer oil flow rate, the inlet and outlet temperatures of the heat transfer oil, and the inlet and outlet temperatures of the molten salt.

[0036] Step S206, sending a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate.

[0037] In this embodiment, a reasonable flow ratio can be achieved between two different media during the heat exchange process, achieving fully automatic flow regulation, improving heat exchange efficiency, and saving energy and reducing consumption. The above method can be applied to energy storage solar thermal power stations and industrial production heat exchange processes, including but not limited to.

[0038] Specifically, after the heat exchange mode is put into use, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the oil side will establish the initial flow, and the heat exchange process will start; after the molten salt and thermal oil flows are stable, and the temperature difference between the inlet and outlet of the heat exchanger is stable and within the allowable range, the operator will increase the thermal oil flow target value according to the actual situation, and the oil side valve will automatically adjust until the target flow is reached; when the oil side flow changes, the salt side demand flow will be automatically calculated, and the salt side flow control valve will be used to adjust it to finally reach the target flow; during the heat exchange process of the energy storage system of the solar thermal power station, the oil side flow will change at any time with the lighting conditions, and the flow ratio control method will be adopted, so that the salt side flow will automatically follow the changes in the oil side flow to achieve automatic adjustment; in the process of adjusting the salt side following the oil side flow change, the temperature changes of the oil and salt sides of the heat exchanger are taken into account at the same time, so as to avoid the expansion of the temperature deviation between the oil and salt sides affecting the service life of the heat exchanger and improve the heat exchange efficiency.

[0039] Through the embodiments provided by the present application, after the heat exchange process is started, the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures are obtained; the molten salt demand flow rate is calculated according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures; a control signal is sent to the regulating valve according to the demand flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate. That is, for the heat exchange process of two different working fluids, the flow matching problem is reasonably controlled, and the control method of one medium flow following the other medium flow is used to realize the conversion from multiple control quantities to single control quantity control, so as to solve the technical problems of poor control accuracy and low heat exchange efficiency in the heat exchange process.

[0040] Optionally, calculating the required flow rate of molten salt according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures may include: calculating the required flow rate of molten salt in the following manner: Among them, F cold salts (kg / s) represents the calculated molten salt demand flow rate, F HTF(kg / s) indicates the heat transfer oil flow rate, T1 (℃) indicates the heat transfer oil inlet temperature, T2 (℃) indicates the heat transfer oil outlet temperature, T4 (℃) indicates the outlet hot molten salt temperature, T3 (℃) indicates the inlet cold molten salt temperature, C pHTF (kJ / kg℃) represents the specific heat capacity of the heat transfer oil, C psalts (kJ / kg℃) represents the specific heat capacity of molten salt.

[0041] Optionally, after the heat exchange process is started, before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the above method may also include: after the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the oil side will establish the initial flow, and the start of the heat exchange process is determined.

[0042] Optionally, after the heat exchange process is started, before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the above method may also include: obtaining the lighting conditions in the environment; when the lighting conditions change by more than a predetermined threshold, starting the heat exchange mode; after the heat exchange mode is started, starting the heat exchange process.

[0043] Optionally, after obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt, the above method may also include: obtaining a first difference between the heat transfer oil inlet and outlet temperatures and a first preset temperature, and a second difference between the inlet and outlet temperatures of the molten salt and a second preset temperature; determining the life parameters of the oil-salt heat exchanger based on the first difference and the second difference.

[0044] In this embodiment, the inlet and outlet temperatures of the oil-salt heat exchanger will affect the service life of the oil-salt heat exchanger. When the first difference between the inlet and outlet temperatures of the thermal oil and the first preset temperature is greater than a threshold value, the temperature curve of the oil-salt heat exchanger is determined. The horizontal axis of the curve is temperature, and the vertical axis is the number of times corresponding to the temperature. The temperature and number curves for a certain period of time are statistically constructed. Based on the curve, the current loss of the oil-salt heat exchanger can be estimated, and the life parameters of the oil-salt heat exchanger can be determined.

[0045] Optionally, after obtaining the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the method may further include: displaying the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures on a display screen.

[0046] As an optional embodiment, the present application also provides a method for controlling the flow rate of a heat exchange medium. Figure 3 As shown in FIG. 1 , a flow chart of a method for controlling flow ratio in a heat exchange process with different working fluids is shown. Taking the flow ratio control of thermal oil and molten salt in a solar thermal power station with energy storage as an example, the control process is as follows.

[0047] Step S301, after the heat exchange mode is put into operation, when the molten salt flow rate is established and reaches the initial flow rate, the oil side valve will automatically open, the oil side will establish the initial flow rate, and the heat exchange process will start;

[0048] Step S303: After the molten salt and heat transfer oil flows are stable and the temperature difference between the heat exchanger inlet and outlet is stable and within the allowable range, the operator increases the heat transfer oil flow target value according to the actual situation, and the oil side valve is automatically adjusted until the target flow is reached;

[0049] Step S305, when the oil side flow rate changes, the salt side required flow rate will be automatically calculated and regulated by the salt side flow control valve to eventually reach the target flow rate;

[0050] Step S307: During the heat exchange process of the energy storage system of the CSP power station, the oil side flow rate will change at any time with the lighting conditions. By adopting the flow ratio control method, the salt side flow rate automatically changes with the oil side flow rate, thus realizing automatic regulation.

[0051] In this embodiment, during the adjustment process of the oil side flow change and the salt side following, the temperature changes of the oil and salt sides of the heat exchanger are taken into account at the same time, so as to avoid the expansion of the temperature deviation between the oil and salt sides affecting the service life of the heat exchanger and improve the heat exchange efficiency. The two different media can achieve a reasonable flow ratio in the heat exchange process, realize the purpose of fully automatic flow regulation, improve heat exchange efficiency, and save energy and reduce consumption.

[0052] like Figure 4 As shown, it is a schematic diagram of the flow ratio control system in the heat exchange process of different working fluids.

[0053] The purpose of the oil-salt matching control method is to store hot molten salt at a suitable temperature under the premise of safe and stable operation of the system. This control loop will adjust the flow of molten salt and monitor the temperature of the heat transfer oil and molten salt entering and leaving the oil-salt heat exchanger, so that the oil-salt side flow can reach the best ratio, the adjustment is fast, and the system operates efficiently under the premise of safe operation of the oil-salt heat exchanger. Among them, the flow ratio of molten salt and heat transfer oil is mainly achieved through the oil-salt side regulating valve group.

[0054] Specifically, Figure 4 As shown, the system may include: a number of oil-salt heat exchangers are connected in sequence through transmission pipelines to form an oil-salt heat exchanger group; the A end of the oil-salt heat exchanger group is connected to the cold salt tank; the B end of the oil-salt heat exchanger group is connected to the hot salt tank; the C end of the oil-salt heat exchanger group is connected to the cold end of the oil side; and the D end of the oil-salt heat exchanger group is connected to the hot end of the oil side.

[0055] Furthermore, between the A end of the oil-salt heat exchanger group and the cold salt tank, there is also a salt side high load regulating valve and a salt side low load regulating valve connected in parallel in series; between the B end of the oil-salt heat exchanger group and the hot salt tank, there is also a salt side high load regulating valve and a salt side low load regulating valve connected in parallel in series.

[0056] Furthermore, between the D end of the oil-salt heat exchanger group and the oil-side hot end, there are also an oil-side high-load regulating valve and an oil-side low-load regulating valve connected in parallel in series.

[0057] Among them, the salt tank and the oil-salt heat exchanger are connected through a molten salt transmission pipeline, and the oil side and the oil-salt heat exchanger are connected through a heat transfer oil transmission pipeline.

[0058] This embodiment simplifies the oil and salt flow ratio control process, controls the oil and salt side equipment as a whole, and realizes the transformation from multivariable control to single variable control. Figure 5 As shown in the flow chart of salt side flow regulation, Figure 6 As shown, this is the flow chart of flow regulation on the thermal oil side.

[0059] Specifically, through Figure 4 The cold salt tank, oil-salt heat exchanger and hot salt tank in the heat storage mode are operated, including: cold salt is sent from the cold salt tank to the oil-salt heat exchanger; hot heat transfer oil is sent from the hot end of the oil side to the oil-salt heat exchanger; the hot heat transfer oil transfers heat energy to the cold salt in the oil-salt heat exchanger to become cold heat transfer oil and is then sent to the cold end of the oil side, the cold salt obtains heat energy to become hot salt, and the hot salt is sent to the hot salt tank for storing heat.

[0060] pass Figure 4 The cold salt tank, oil-salt heat exchanger and hot salt tank in the heat exchanger realize heat release mode operation, including: hot salt is sent from the hot salt tank to the oil-salt heat exchanger; cold heat transfer oil is sent from the cold end of the oil side to the oil-salt heat exchanger; the hot salt transfers heat energy to the cold heat transfer oil in the oil-salt heat exchanger to become cold salt and then is sent to the cold salt tank, the cold heat transfer oil obtains heat energy to become hot heat transfer oil, and the hot heat transfer oil is sent to the hot end of the oil side to provide heat.

[0061] Preferably, the salt side flow regulation can be realized in the heat storage and heat release mode operation. Figure 5 As shown, the salt side flow regulation includes: the flow controller receives the molten salt demand flow value, and when it is monitored that the salt side flow does not reach the molten salt demand flow value, it sends a molten salt flow control instruction to the judgment module, and the judgment module sends a comprehensive control instruction to the salt side high load regulating valve and / or the salt side low load regulating valve to adjust the molten salt flow until the salt side flow reaches the set value.

[0062] Preferably, the flow rate of the heat transfer oil can be adjusted in the heat storage and heat release modes, such as Figure 6 As shown, the flow regulation on the thermal oil side includes: the flow controller receives the thermal oil flow set value, and when it is detected that the thermal oil flow does not reach the thermal oil flow set value, sends a thermal oil flow control instruction to the judgment module, and the judgment module sends a comprehensive control instruction to the oil side high load regulating valve and / or the oil side low load regulating valve to adjust the thermal oil flow until the oil side flow reaches the set value.

[0063] Among them, during the heat exchange process of the system, the molten salt demand flow rate tracks the heat transfer oil flow rate, calculates the opening of the molten salt regulating valve, and adjusts the molten salt flow rate to achieve a suitable ratio of oil and salt flow rates.

[0064] After the salt side follows the oil side, the oil and salt temperatures at the inlet and outlet of the oil-salt heat exchanger and the corresponding wall temperature deviation are involved in the flow calculation during the control process, thereby improving the heat exchange efficiency while protecting the heat exchanger.

[0065] During the heat exchange process, a single variable is controlled and the other variables are automatically adjusted to reduce human intervention and avoid the problem of poor flow matching caused by flow fluctuations.

[0066] Important information such as heat transfer oil flow, molten salt demand flow, valve group control instructions, etc. are all displayed on the control panel. When the system is abnormal, the operator on duty can intervene manually at any time.

[0067] The flow controller is connected to the molten salt heat exchanger through a transmission pipeline: the molten salt demand flow is automatically calculated based on the heat transfer oil flow, heat transfer oil inlet and outlet temperatures, molten salt inlet temperature and molten salt outlet temperature. The following formula (enthalpy balance of heat exchange between high-temperature heat transfer oil and cold molten salt) is used. This calculation method can also be applied to other heat exchange processes.

[0068] Among them, F cold salts (kg / s) represents the calculated molten salt demand flow rate, F HTF (kg / s) indicates the heat transfer oil flow rate, T1 (℃) indicates the heat transfer oil inlet temperature, T2 (℃) indicates the heat transfer oil outlet temperature, T4 (℃) indicates the outlet hot molten salt temperature, T3 (℃) indicates the inlet cold molten salt temperature, C pHTF (kJ / kg℃) represents the specific heat capacity of the heat transfer oil, C psalts (kJ / kg℃) represents the specific heat capacity of molten salt.

[0069] In this embodiment, in order to reasonably control the flow matching problem in the heat exchange process of two different working fluids, a control method in which one medium flow follows another medium flow is specially designed to realize the conversion from multiple control quantities to single control quantity control.

[0070] In this control mode, it is only necessary to control the flow rate of the thermal oil. Its control characteristics are as follows:

[0071] The molten salt demand flow and the heat transfer oil flow are two control variables. The control method adopts the salt side flow following the oil side flow. The operator only needs to adjust the oil side flow control quantity to reduce the operation amount.

[0072] Under this control mode, the oil side regulating valve group follows the oil side flow signal - the salt side demand flow follows the oil side flow change - the salt side regulating valve group follows the salt side demand flow, realizing centralized control of multiple devices and multiple measuring points.

[0073] Under this control mode, the regulation process fully considers the safety of the oil-salt heat exchanger itself. When calculating the salt side flow, the temperature changes of the molten salt and heat transfer oil entering and leaving the oil-salt heat exchanger are considered, which can effectively avoid the rapid change of the heat exchanger end difference and prevent the occurrence of thermal shock.

[0074] This control mode not only solves the problem of multi-device operation and multi-point monitoring, but also effectively solves the technical problem of whether the oil and salt flow ratio is reasonable, thereby improving the heat exchange efficiency of the heat exchanger.

[0075] Under this control mode, problems such as flow imbalance and heat exchanger overheating caused by human operation can be effectively reduced, which is beneficial to the safe operation of the energy storage system.

[0076] This control method controls the salt side control and the oil side control as a whole, and controls multiple systems and multiple variables as a single system, making the oil-salt heat exchange control more intelligent and simple.

[0077] In the process of heat exchange in industrial production, the safe, stable and efficient operation of the heat exchanger body and the heat exchange system directly affects the heat exchange efficiency. Reasonable control of the matching of the flow rates of the two heat exchange media is an effective way to effectively solve the heat exchange efficiency and reduce the amount of manual operation.

[0078] The control mode of one medium flow following another medium flow can effectively minimize the heat energy loss in the heat exchange process. Taking the oil-salt heat exchange process of a solar thermal power station as an example, this control method can minimize the heat energy loss of high / low temperature heat transfer oil through the form of heat absorption / heat release with molten salt, avoid over-temperature problems in the oil-salt heat exchanger, and also affect the number of salt pump operations, which also plays a certain role in shortening the energy storage time, extending the energy release time, and saving energy and reducing consumption.

[0079] This control mode is of great significance for matching the flow of two different media in the heat exchange process of industrial production, reducing the amount of human operation, and improving heat exchange efficiency.

[0080] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0081] In this embodiment, a heat exchange medium flow control method device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0082] Figure 7 is a structural block diagram of a flow control device for a heat exchange medium according to an embodiment of the present invention, such as Figure 7 As shown, the flow control device of the heat exchange medium includes:

[0083] The first acquisition unit 71 is used to acquire the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures after the heat exchange process is started.

[0084] The calculation unit 73 is used to calculate the required flow rate of the molten salt according to the flow rate of the heat transfer oil, the inlet and outlet temperatures of the heat transfer oil, and the inlet and outlet temperatures of the molten salt.

[0085] The sending unit 75 is used to send a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate.

[0086] Through the embodiments provided in the present application, after the heat exchange process is started, the first acquisition unit 71 acquires the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt; the calculation unit 73 calculates the required molten salt flow rate according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt; the sending unit 75 sends a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal, and adjusts the molten salt flow rate, that is, for the heat exchange process of two different working fluids, the flow matching problem is reasonably controlled, and the control method of one medium flow following another medium flow is used to realize the conversion from multiple control quantities to single control quantity for control, and the technical problem of poor control accuracy and low heat exchange efficiency in the heat exchange process is solved.

[0087] Optionally, the calculation unit 73 includes: a calculation module, configured to calculate the required flow rate of the molten salt in the following manner:

[0088] Among them, F cold salts Indicates the calculated molten salt demand flow rate, F HTF represents the heat transfer oil flow rate, T1 represents the heat transfer oil inlet temperature, T2 represents the heat transfer oil outlet temperature, T4 represents the outlet hot molten salt temperature, T3 represents the inlet cold molten salt temperature,

[0089] C pHTF Indicates the specific heat capacity of the heat transfer oil, C psalts represents the specific heat capacity of molten salt.

[0090] Optionally, the above-mentioned device may also include: a first determination unit, which is used to obtain the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started. After the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the oil side will establish the initial flow, and it is determined that the heat exchange process is started.

[0091] Optionally, the above-mentioned device may also include: a second acquisition unit, used to obtain the lighting conditions in the environment before obtaining the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started; a first starting unit, used to start the heat exchange mode when the light condition changes by more than a predetermined threshold; a second starting unit, used to start the heat exchange process after the heat exchange mode is started.

[0092] Optionally, the above-mentioned device may also include: a third acquisition unit, used to obtain the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperature, and the inlet and outlet temperature of the molten salt, and then obtain the first difference between the inlet and outlet temperature of the heat transfer oil and the first preset temperature, and the second difference between the inlet and outlet temperature of the molten salt and the second preset temperature; a second determination unit, used to determine the life parameters of the oil-salt heat exchanger based on the first difference and the second difference.

[0093] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0094] An embodiment of the present invention further provides a storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0095] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0096] S1, after the heat exchange process is started, the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures are obtained;

[0097] S2, calculate the required flow rate of molten salt according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures;

[0098] S3, sending a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate.

[0099] Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store computer programs.

[0100] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0101] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0102] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0103] S1, after the heat exchange process is started, the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures are obtained;

[0104] S2, calculate the required flow rate of molten salt according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures;

[0105] S3, sending a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate.

[0106] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0107] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling the flow rate of a heat exchange medium, characterized in that: include: After the heat exchange process is started, the heat transfer oil flow rate, heat transfer oil inlet and outlet temperatures, and molten salt inlet and outlet temperatures are obtained; The required flow rate of the molten salt is calculated according to the flow rate of the heat transfer oil, the inlet and outlet temperatures of the heat transfer oil, and the inlet and outlet temperatures of the molten salt; Sending a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate; After obtaining the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the method further includes: Obtaining a first difference between the inlet and outlet temperatures T1-T2 of the heat transfer oil and a first preset temperature, and a second difference between the inlet and outlet temperatures T4-T3 of the molten salt and a second preset temperature; determining a life parameter of the oil-salt heat exchanger according to the first difference and the second difference; The determining of the life parameter of the oil-salt heat exchanger includes: when a first difference between the inlet and outlet temperatures T1-T2 of the heat transfer oil and a first preset temperature is greater than a threshold value, determining a temperature curve of the oil-salt heat exchanger, wherein the abscissa of the curve is the temperature and the ordinate is the number of times corresponding to the temperature, statistically calculating a curve of the temperature and the number of times within a period of time, estimating the current loss of the oil-salt heat exchanger according to the curve, and then determining the life parameter of the oil-salt heat exchanger; Wherein, T1 represents the inlet temperature of the heat transfer oil, T2 represents the outlet temperature of the heat transfer oil, T4 represents the outlet temperature of the hot molten salt, and T3 represents the inlet temperature of the cold molten salt.

2. The method according to claim 1, characterized in that The step of calculating the required flow rate of the molten salt according to the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt comprises: The required molten salt flow rate is calculated as follows: Among them, F coldsalts Indicates the calculated required flow rate of the molten salt, F HTF represents the heat transfer oil flow rate, T1 represents the heat transfer oil inlet temperature, T2 represents the heat transfer oil outlet temperature, T4 represents the outlet hot molten salt temperature, T3 represents the inlet cold molten salt temperature, C pHTF Indicates the specific heat capacity of the heat transfer oil, C psalts represents the specific heat capacity of molten salt.

3. The method according to claim 1, characterized in that After the heat exchange process is started, before obtaining the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the method further includes: After the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the initial flow is established on the oil side, and the heat exchange process is determined to be started.

4. The method according to claim 1, characterized in that: After the heat exchange process is started, before obtaining the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures, the method further includes: Get the lighting conditions in the environment; When the illumination condition changes beyond a predetermined threshold, starting a heat exchange mode; After the heat exchange mode is started, the heat exchange process is started.

5. A heat exchange medium flow control device, characterized in that: include: The first acquisition unit is used to acquire the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperatures, and the molten salt inlet and outlet temperatures after the heat exchange process is started; A calculation unit, configured to calculate the required flow rate of the molten salt according to the heat transfer oil flow rate, the inlet and outlet temperatures of the heat transfer oil, and the inlet and outlet temperatures of the molten salt; a sending unit, configured to send a control signal to the regulating valve according to the required flow rate, so that the regulating valve adjusts the opening of the regulating valve according to the control signal to adjust the molten salt flow rate; A third acquisition unit is used to acquire a first difference between the inlet and outlet temperatures T1-T2 of the thermal oil and a first preset temperature, and a second difference between the inlet and outlet temperatures T4-T3 of the molten salt and a second preset temperature after acquiring the thermal oil flow rate, the inlet and outlet temperatures of the thermal oil, and the inlet and outlet temperatures of the molten salt; a second determining unit, configured to determine a life parameter of the oil-salt heat exchanger according to the first difference and the second difference; The determining of the life parameter of the oil-salt heat exchanger includes: when a first difference between the inlet and outlet temperatures T1-T2 of the heat transfer oil and a first preset temperature is greater than a threshold value, determining a temperature curve of the oil-salt heat exchanger, wherein the abscissa of the curve is the temperature and the ordinate is the number of times corresponding to the temperature, statistically calculating a curve of the temperature and the number of times within a period of time, estimating the current loss of the oil-salt heat exchanger according to the curve, and then determining the life parameter of the oil-salt heat exchanger; Wherein, T1 represents the inlet temperature of the heat transfer oil, T2 represents the outlet temperature of the heat transfer oil, T4 represents the outlet temperature of the hot molten salt, and T3 represents the inlet temperature of the cold molten salt.

6. The device according to claim 5, characterized in that The computing unit comprises: The calculation module is used to calculate the required flow rate of the molten salt in the following manner: Among them, F coldsalts Indicates the calculated required flow rate of the molten salt, F HTF represents the heat transfer oil flow rate, T1 represents the heat transfer oil inlet temperature, T2 represents the heat transfer oil outlet temperature, T4 represents the outlet hot molten salt temperature, T3 represents the inlet cold molten salt temperature, C pHTF Indicates the specific heat capacity of the heat transfer oil, C psalts represents the specific heat capacity of molten salt.

7. The device according to claim 5, characterized in that The device also includes: The first determination unit is used to obtain the heat transfer oil flow, the heat transfer oil inlet and outlet temperatures, and the inlet and outlet temperatures of the molten salt after the heat exchange process is started. After the heat exchange mode is put into operation, when the molten salt flow is established and reaches the initial flow, the oil side valve will automatically open, the oil side will establish the initial flow, and the start of the heat exchange process is determined.

8. The device according to claim 5, characterized in that The device also includes: A second acquisition unit is used to acquire the light conditions in the environment before acquiring the heat transfer oil flow rate, the heat transfer oil inlet and outlet temperature, and the molten salt inlet and outlet temperature after the heat exchange process is started; A first starting unit, configured to start a heat exchange mode when the illumination condition changes beyond a predetermined threshold; The second starting unit is used to start the heat exchange process after the heat exchange mode is started.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, wherein the computer program is configured to execute the method according to any one of claims 1 to 4 when executed.

10. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to perform the method according to any one of claims 1 to 4.

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