Method, system and apparatus for obtaining operating point of molten salt pump, device, and medium

Abstract

A method for obtaining an operating point of a molten salt pump, comprising: respectively acquiring the inlet pressure and outlet pressure of a molten salt pump; adjusting the outlet flow rate of the molten salt pump, and detecting molten salt data corresponding to different outlet flow rates; on the basis of the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates, respectively calculating head values of the molten salt pump corresponding to different outlet flow rates when conveying a molten salt medium; and on the basis of a static head value corresponding to the molten salt pump and the head values of the molten salt pump corresponding to different outlet flow rates when conveying the molten salt medium, determining an operating point of the molten salt pump. By calculating the head values of the molten salt pump when conveying the molten salt medium, and obtaining the operating point of the molten salt point on the basis of the static head value and the head values of the molten salt pump corresponding to different outlet flow rates when conveying the molten salt medium, energy saving improvement measures are formulated for a molten salt energy storage system on the basis of the operating point of the molten salt pump. The present invention further relates to a system and apparatus for obtaining an operating point of a molten salt pump, a computer device, and a computer-readable storage medium.

Description

A method, system, device, equipment and medium for obtaining the working point of a molten salt pump

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on January 4, 2024, with application number 202410016631.6 and invention name “A method, system, device, equipment and medium for determining the working point of a molten salt pump”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of molten salt energy storage technology, and in particular to a method, system, device, equipment and medium for obtaining the working point of a molten salt pump. Background Art

[0003] With the rapid expansion of renewable energy grid integration, new energy storage technologies are essential and fundamental to building new power systems. Molten salt, as a medium- to high-temperature heat transfer and storage medium, offers advantages over conventional high-temperature heat transfer fluids, including lower saturated vapor pressure, superior high-temperature stability, low viscosity, and a higher specific heat capacity. Molten salt pumps are key components in molten salt heat storage systems, primarily providing power for the molten salt. The safety and economical operation of these pumps are crucial to these systems.

[0004] However, molten salt is a non-Newtonian fluid. When it cools, it condenses and easily clogs the pressure transmission pipe. As a result, it is impossible to directly measure the inlet and outlet pressures of the molten salt pump through pressure transmitters or pressure gauges at the project site. Therefore, it is impossible to understand the operating point of the molten salt pump, and it is impossible to formulate further energy-saving transformation measures for the molten salt heat storage system.

[0005] Summary of the Invention

[0006] In view of this, the present application provides a method, system, device, equipment and medium for obtaining the operating point of a molten salt pump to solve the problem of determining the operating point of a molten salt pump.

[0007] In a first aspect, the present application provides a method for obtaining an operating point of a molten salt pump, the method comprising:

[0008] Obtain the inlet pressure and outlet pressure of the molten salt pump respectively;

[0009] Adjust the outlet flow rate of the molten salt pump and detect the molten salt data corresponding to different outlet flow rates, wherein the molten salt data includes: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height, and the outlet molten salt liquid column height;

[0010] Based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates, the lift value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates is calculated respectively;

[0011] The operating point of the molten salt pump is determined based on the static head value corresponding to the molten salt pump and the head value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0012] This application collects the inlet pressure and outlet pressure of the molten salt pump to calculate the head value of the molten salt medium transported by the molten salt pump based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates, and obtains the operating point of the molten salt pump based on the static head value and the head value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates, so as to formulate energy-saving transformation measures for the molten salt energy storage system according to the operating point of the molten salt pump.

[0013] In an optional embodiment, respectively obtaining the inlet pressure and the outlet pressure of the molten salt pump includes:

[0014] A backflow air pressure measuring device is respectively provided at the inlet and outlet of the molten salt pump, and the gas pressure measured by the backflow air pressure measuring device is obtained;

[0015] The inlet pressure and outlet pressure of the molten salt pump are determined based on the gas pressure measured by the backflow air pressure measuring device.

[0016] The present application indirectly measures the inlet pressure and outlet pressure of the molten salt pump through a backflow air pressure measuring device, and determines the inlet pressure and outlet pressure of the molten salt pump according to the gas pressure measured by the backflow air pressure measuring device, so as to realize indirect measurement of the inlet pressure and outlet pressure of the molten salt pump.

[0017] In an optional embodiment, determining the operating point of the molten salt pump includes:

[0018] Determine the hydraulic performance curve corresponding to the molten salt pump based on the head value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates;

[0019] Calculating the device head corresponding to different outlet flow rates based on the static head value;

[0020] Determine the device characteristic curve corresponding to the molten salt pump transporting clean water medium based on the device head corresponding to different outlet flow rates;

[0021] The intersection of the hydraulic performance curve and the device characteristic curve is determined as the working point of the molten salt pump.

[0022] This application draws the hydraulic performance curve corresponding to the molten salt pump and the device characteristic curve corresponding to the molten salt pump transporting clean water medium to determine the corresponding relationship between the flow rate and the head value and device head of the molten salt pump transporting the molten salt medium, and determines the intersection of the hydraulic performance curve and the device characteristic curve as the working point of the molten salt pump to realize the confirmation of the working point of the molten salt pump.

[0023] In an optional embodiment, the static head value corresponding to the molten salt pump is calculated as follows:

[0024] respectively obtaining a first geometric height of a molten salt liquid level in a cold molten salt storage tank connected to the molten salt pump and a second geometric height of a molten salt liquid level in a hot molten salt storage tank connected to the molten salt pump;

[0025] The difference between the first geometric height and the second geometric height is calculated to obtain a static head value corresponding to the molten salt pump.

[0026] This application determines the static head value corresponding to the molten salt pump by calculating the height difference of the molten salt liquid level in the cold molten salt storage tank and the hot molten salt storage tank, so as to calculate the device head according to the static head value corresponding to the molten salt pump.

[0027] In an optional embodiment, the method further includes:

[0028] Based on the average density of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates and the head value of the molten salt medium transported by the molten salt pump, the effective power of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates is calculated;

[0029] Obtaining the input power and efficiency of the molten salt pump motor, and calculating the shaft power of the molten salt pump for transporting the molten salt medium based on the input power and efficiency of the motor;

[0030] Based on the shaft power and the effective power of the molten salt pump for transporting the molten salt medium corresponding to different outlet flow rates, the efficiency of the molten salt pump for transporting the clean water medium corresponding to different outlet flow rates is calculated.

[0031] This application calculates the effective power and shaft power corresponding to the molten salt pump transporting the molten salt medium, and calculates the efficiency of the molten salt pump transporting the clean water medium based on the effective power and shaft power, so as to confirm the efficiency of the molten salt pump transporting the clean water medium.

[0032] In a second aspect, the present application provides a molten salt pump operating point determination system, which includes a backflow air pressure measuring device and a controller, wherein the backflow air pressure measuring device includes a first backflow air pressure measuring device and a second backflow air pressure measuring device, wherein:

[0033] The first backflow air pressure measuring device is installed at the inlet of the molten salt pump, the cavity of the first backflow air pressure measuring device is connected to the inlet pipeline of the molten salt pump, and the first backflow air pressure measuring device is used to collect the inlet pressure of the molten salt pump;

[0034] The second backflow air pressure measuring device is installed at the outlet of the molten salt pump, the cavity of the second backflow air pressure measuring device is connected to the outlet pipeline of the molten salt pump, and the second backflow air pressure measuring device is used to collect the outlet pressure of the molten salt pump;

[0035] The controller is used to execute the method for obtaining the operating point of the molten salt pump according to the first aspect or any corresponding embodiment thereof.

[0036] The present application indirectly measures the inlet pressure of the molten salt pump and the outlet pressure of the molten salt pump through a backflow air pressure measuring device, so as to achieve the measurement of the inlet pressure of the molten salt pump and the outlet pressure of the molten salt pump.

[0037] In an optional embodiment, the first backflow air pressure measuring device and the second backflow air pressure measuring device are both provided with a pressure measuring device and a pressure regulating device;

[0038] The pressure measuring device is used to measure the gas pressure in the cavity, and the pressure regulating device is used to regulate the gas pressure in the cavity according to the gas pressure measured by the pressure measuring device; the first backflow air pressure measuring device and the second backflow air pressure measuring device are also provided with a temperature measuring device and a temperature regulating device, wherein,

[0039] The temperature measuring device is used to measure the temperature in the cavity;

[0040] The temperature regulating device is used to regulate the temperature in the cavity according to the temperature measured by the temperature measuring device.

[0041] The present application regulates the gas pressure and temperature in the cavity through a pressure regulating device and a temperature regulating device so that the gas pressure and temperature in the cavity are within a relatively appropriate range, ensuring the fluidity of the molten salt and improving the accuracy of the gas pressure measurement results.

[0042] In a third aspect, the present application provides a device for obtaining an operating point of a molten salt pump, the device comprising:

[0043] An acquisition module, used to respectively acquire the inlet pressure and outlet pressure of the molten salt pump;

[0044] A detection module is used to adjust the outlet flow rate of the molten salt pump and detect molten salt data corresponding to different outlet flow rates, wherein the molten salt data includes: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height, and the outlet molten salt liquid column height;

[0045] The first calculation module is used to calculate the lift value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates;

[0046] The determination module is used to determine the working point of the molten salt pump based on the static head value corresponding to the molten salt pump and the head value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0047] In a fourth aspect, the present application provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, computer instructions being stored in the memory, and the processor executing the computer instructions to thereby execute the method for obtaining the operating point of the molten salt pump according to the first aspect or any corresponding embodiment thereof.

[0048] In a fifth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for obtaining the operating point of a molten salt pump according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] FIG1 is a flow chart of a method for obtaining an operating point of a molten salt pump according to an embodiment of the present application;

[0051] FIG2 is a flow chart of another method for obtaining the operating point of a molten salt pump according to an embodiment of the present application;

[0052] FIG3 is a schematic structural diagram of a system for obtaining an operating point of a molten salt pump according to an embodiment of the present application;

[0053] FIG4 is a structural block diagram of a device for obtaining an operating point of a molten salt pump according to an embodiment of the present application;

[0054] FIG5 is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions 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 those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0056] With the rapid development of the scale of renewable energy grid connection, its intermittent and instability have an impact on the safe and stable operation of the power system. Therefore, there is an urgent need to configure energy storage systems to absorb renewable energy electricity. New energy storage is an important technology and basic equipment for building a new power system, and an important support for achieving the goals of carbon peak and carbon neutrality. Build new energy storage technologies based on conventional power sources, such as steam extraction storage for thermal power units, to promote the integrated and coordinated development of source, grid, load and storage. As a medium- and high-temperature heat transfer and heat storage medium, molten salt has the advantages of lower saturated vapor pressure, superior high-temperature stability, low viscosity and large specific heat capacity compared to conventional high-temperature heat transfer fluids. Therefore, the molten salt heat storage system has the advantages of a wide range of applications, green environmental protection, safety and stability. It is currently the first choice for large-scale, long-term medium- and high-temperature heat storage technology. It is not only suitable for solar thermal power generation, but can also be used for flexible transformation of thermal power, waste heat recovery and utilization, clean heating, etc. It is one of the key technologies for building future new energy storage systems.

[0057] At present, there are still some key technical issues that need to be addressed before molten salt heat storage technology can be widely applied. The molten salt pump is a key component of the molten salt heat storage system, its primary function being to provide power for the molten salt. The molten salt pump consumes a lot of electricity, and its safe and economical operation is crucial to the system. Because molten salt is a non-Newtonian fluid, it condenses when cooled, easily clogging the pressure transmission pipes. Therefore, it is impossible to directly measure the inlet and outlet pressures of the molten salt pump using pressure transmitters or pressure gauges on site. This makes it impossible to understand the operating point of the molten salt pump, making it difficult to develop further energy-saving retrofit measures for the molten salt heat storage system.

[0058] According to an embodiment of the present application, an embodiment of a method for obtaining the operating point of a molten salt pump is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0059] In this embodiment, a method for obtaining the operating point of a molten salt pump is provided, which can be used in a mobile terminal. FIG1 is a flow chart of the method for obtaining the operating point of a molten salt pump according to an embodiment of the present application. As shown in FIG1 , the process includes the following steps:

[0060] Step S101 , respectively obtaining the inlet pressure and outlet pressure of the molten salt pump.

[0061] In the embodiment of the present application, the inlet pressure and the outlet pressure of the molten salt pump are measured respectively, and the inlet pressure p1 and the outlet pressure p2 of the molten salt pump are collected.

[0062] Step S102: adjusting the outlet flow rate of the molten salt pump and detecting molten salt data corresponding to different outlet flow rates.

[0063] Among them, the molten salt data include: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height and the outlet molten salt liquid column height.

[0064] In the embodiment of the present application, the opening of the outlet valve of the molten salt pump is adjusted while the rotational speed remains unchanged to adjust the outlet flow of the molten salt pump, and the operating condition measurement is started after the molten salt pump runs stably.

[0065] The flow rate Q of the molten salt pump is measured by a flow meter, and the average density ρ of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates is detected. m , inlet molten salt flow rate V1, outlet molten salt flow rate V2, inlet molten salt liquid column height z1 and outlet molten salt liquid column height z2.

[0066] Specifically, molten salt is an incompressible fluid. The inlet density ρ1 of the molten salt at the inlet of the molten salt pump and the outlet density ρ2 of the molten salt at the inlet of the molten salt pump are measured respectively, and the average density ρ of the molten salt pump when transporting the molten salt medium is calculated according to the following formula: m :

[0067] Among them, ρ1 is the inlet density of molten salt at the inlet of the molten salt pump, and ρ2 is the outlet density of molten salt at the inlet of the molten salt pump.

[0068] Specifically, the inlet diameter D1 of the molten salt pump and the outlet diameter D2 of the molten salt pump are measured respectively, and the inlet molten salt flow rate V1 and the outlet molten salt flow rate V2 are calculated according to the following formula:

[0069] Among them, D1 is the inlet pipe diameter of the molten salt pump, and D2 is the outlet pipe diameter of the molten salt pump.

[0070] Specifically, the height z1 of the molten salt liquid column at the inlet and the height z2 of the molten salt liquid column at the outlet of the molten salt pump are measured respectively, and the water head h1 at the inlet and the water head h2 at the outlet of the molten salt pump are calculated according to the following formula:

[0071] Where g is the acceleration due to gravity.

[0072] Step S103 , based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates, respectively calculating the lift values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0073] In the embodiment of the present application, based on the molten salt data corresponding to different outlet flow rates, the lift value of the molten salt medium transported by the molten salt pump is calculated according to the following formula:

[0074] Step S104 : determining the operating point of the molten salt pump based on the static head value corresponding to the molten salt pump and the head values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0075] In the embodiment of the present application, the static head value H corresponding to the molten salt pump is pre-calculated. st , and according to the static head value H st The head value H of the molten salt pump transporting the molten salt medium corresponding to different outlet flow rates is determined to determine the working point of the molten salt pump, so as to formulate further energy-saving transformation measures for the molten salt heat storage system.

[0076] The method for obtaining the operating point of a molten salt pump provided in this embodiment collects the inlet and outlet pressures of the molten salt pump to calculate the head value of the molten salt medium transported by the molten salt pump based on the inlet and outlet pressures of the molten salt pump and the molten salt data corresponding to different outlet flow rates. The operating point of the molten salt pump is obtained based on the static head value and the head value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates. Energy-saving modification measures for the molten salt energy storage system are formulated based on the operating point of the molten salt pump.

[0077] In this embodiment, a method for obtaining the operating point of a molten salt pump is provided. FIG2 is a flow chart of the method for obtaining the operating point of a molten salt pump according to an embodiment of the present application. As shown in FIG2 , the process includes the following steps:

[0078] Step S201 , respectively obtaining the inlet pressure and outlet pressure of the molten salt pump.

[0079] Specifically, the above step S201 includes:

[0080] Step S2011: a backflow air pressure measuring device is respectively provided at the inlet and outlet of the molten salt pump, and the gas pressure measured by the backflow air pressure measuring device is obtained.

[0081] Step S2012: determining the inlet pressure and outlet pressure of the molten salt pump based on the gas pressure measured by the backflow air pressure measuring device.

[0082] In an embodiment of the present application, backflow air pressure measuring devices are respectively provided at the inlet and outlet of the molten salt pump, and the inlet pressure and outlet pressure of the salt pump are indirectly measured by the backflow air pressure measuring devices.

[0083] The inlet pressure and outlet pressure of the molten salt pump are indirectly measured by the backflow air pressure measuring device. The inlet pressure and outlet pressure of the molten salt pump are determined according to the gas pressure measured by the backflow air pressure measuring device, so as to realize indirect measurement of the inlet pressure and outlet pressure of the molten salt pump.

[0084] Step S202: adjusting the outlet flow rate of the molten salt pump and detecting molten salt data corresponding to different outlet flow rates.

[0085] Please refer to step S102 of the embodiment shown in FIG1 for details, which will not be described again here.

[0086] Step S203 : Based on the molten salt data corresponding to different outlet flow rates, respectively calculating the lift values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0087] Please refer to step S103 of the embodiment shown in FIG1 for details, which will not be described again here.

[0088] Step S204 : determining the operating point of the molten salt pump based on the static head value corresponding to the molten salt pump and the head values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0089] Specifically, calculate the static head value corresponding to the molten salt pump according to the following steps:

[0090] Step S2041 , respectively obtaining a first geometric height of a molten salt liquid level in a cold molten salt storage tank connected to the molten salt pump and a second geometric height of a molten salt liquid level in a hot molten salt storage tank connected to the molten salt pump.

[0091] Step S2042: Calculate the difference between the first geometric height and the second geometric height to obtain the static head value corresponding to the molten salt pump.

[0092] In the embodiment of the present application, the molten salt pump is connected to the cold molten salt storage tank and the hot molten salt storage tank respectively, and the geometric height of the molten salt liquid level in the cold molten salt storage tank and the hot molten salt storage tank is measured respectively, and the molten salt liquid level pressure difference in the cold molten salt storage tank and the hot molten salt storage tank is calculated to obtain the static head value H corresponding to the molten salt pump. st .

[0093] The static head value corresponding to the molten salt pump is determined by calculating the height difference of the molten salt liquid levels in the cold molten salt storage tank and the hot molten salt storage tank, so that the device head can be calculated based on the static head value corresponding to the molten salt pump.

[0094] Specifically, determining the operating point of the molten salt pump in step S204 includes:

[0095] Step S2043: determining a hydraulic performance curve corresponding to the molten salt pump based on the lift value of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0096] Step S2044: Calculate the device head corresponding to different outlet flow rates based on the static head value.

[0097] Step S2045 , determining a device characteristic curve corresponding to the molten salt pump conveying the clean water medium based on the device head corresponding to different outlet flow rates.

[0098] Step S2046: determine the intersection of the hydraulic performance curve and the device characteristic curve as the operating point of the molten salt pump.

[0099] In the embodiment of the present application, the opening of the molten salt pump outlet valve is adjusted, and steps S202 to S204 are repeated to obtain the head of the molten salt pump when transporting molten salt under the same speed and different flow conditions, and the hydraulic performance curve of QH of the molten salt pump when transporting molten salt is drawn.

[0100] Calculate the lift of the device according to the following formula: H z =H st +KQ 2 (7)

[0101] Among them, H z is the device head, H st is the static head value of the system. For a specific pump, K is a constant.

[0102] Repeat the above steps S202 to S204 to measure the molten salt flow Q1 and head H1 under the design working conditions of the molten salt system. st ) and (Q1, H1) are substituted into formula (7) to obtain the constant K.

[0103] The static head value H st and constant K to calculate H st Formula (7) is used to obtain the device characteristic curve H corresponding to the molten salt pump transporting clean water medium z =H st +KQ 2 .

[0104] The hydraulic performance curve of QH and H of the molten salt pump z =H st +KQ 2 The device characteristic curves are drawn in the same coordinate system according to the same scale, and the intersection point is determined as the working point of the molten salt pump.

[0105] By drawing the hydraulic performance curve corresponding to the molten salt pump and the device characteristic curve corresponding to the molten salt pump conveying clean water medium, the corresponding relationship between the flow rate and the head value and device head of the molten salt pump conveying the molten salt medium is determined. The intersection of the hydraulic performance curve and the device characteristic curve is determined as the working point of the molten salt pump to confirm the working point of the molten salt pump.

[0106] Step S205 , calculating the effective power of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates based on the average density of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates and the lift value of the molten salt medium transported by the molten salt pump.

[0107] Step S206 : acquiring the input power and efficiency of the molten salt pump motor, and calculating the shaft power of the molten salt pump for transporting the molten salt medium based on the input power and efficiency of the motor.

[0108] Step S207 , calculating the efficiency of the molten salt pump in transporting the clean water medium corresponding to different outlet flow rates based on the shaft power and the effective power of the molten salt pump in transporting the molten salt medium corresponding to different outlet flow rates.

[0109] In the embodiment of the present application, the effective power P of the molten salt medium transported by the molten salt pump is calculated according to the following formula: u : P u =ρ m gHQ (8)

[0110] Among them, ρ m is the average density of the molten salt medium transported by the molten salt pump, g is the acceleration of gravity, H is the head value of the molten salt medium transported by the molten salt pump, and Q is the flow rate.

[0111] Measure the input power P of the molten salt pump motor m , according to the equipment specifications, query the motor efficiency η m Calculate the shaft power P of the molten salt pump transporting molten salt medium according to the following formula: s : P s =P m η m (9)

[0112] Among them, P m is the input power of the molten salt pump motor, η m is the motor efficiency.

[0113] The efficiency η of the molten salt pump transporting clean water medium is calculated according to the following formula:

[0114] It should be noted that at the same speed, when the molten salt pump conveys molten salt, the operating conditions of the molten salt pump under clean water medium are adjusted by adjusting the opening of the molten salt pump outlet valve, and repeating the above steps to obtain the head, efficiency, and shaft power of the molten salt pump when conveying limestone slurry under the same speed conditions and different flow rates, thereby obtaining the hydraulic performance of the molten salt pump, and drawing the flow-head, flow-efficiency, flow-shaft power and other performance curves of the molten salt pump when conveying limestone slurry.

[0115] Industrial steam supply exhibits a critical energy consumption characteristic curve, which is crucial for unit economic operation. Only when the unit operates to the right of this curve does the heat consumption of the industrial steam supply condition decrease below the heat consumption of the pure condensing condition at the same electrical load. Industrial steam supply reduces unit energy consumption and improves unit thermal efficiency. When the unit operates to the left of this curve, the heat consumption of the industrial steam supply condition increases above the pure condensing condition. By implementing an optimized control method for the thermal efficiency of industrial steam cogeneration units, it is possible to rationally plan the heat load of industrial steam supply between power plant units, achieving optimal plant economics and improving overall plant operation efficiency, refinement, and automation.

[0116] The method for obtaining the operating point of the molten salt pump provided in this embodiment calculates the effective power and shaft power corresponding to the molten salt medium transported by the molten salt pump, and calculates the efficiency of the molten salt pump in transporting the clean water medium based on the effective power and shaft power, so as to confirm the efficiency of the molten salt pump in transporting the clean water medium.

[0117] This embodiment also provides a molten salt pump operating point determination system, which includes a backflow air pressure measuring device and a controller. The controller is used to execute the above-mentioned molten salt pump operating point determination method. As shown in Figure 3, the backflow air pressure measuring device includes a first backflow air pressure measuring device 2 and a second backflow air pressure measuring device 3.

[0118] As shown in Figure 3, the first backflow air pressure measuring device 2 is installed at the inlet of the molten salt pump 1, the cavity of the first backflow air pressure measuring device 2 is connected to the inlet pipeline of the molten salt pump 1, and the first backflow air pressure measuring device 2 is used to collect the inlet pressure of the molten salt pump 1; the second backflow air pressure measuring device 3 is installed at the outlet of the molten salt pump 1, the cavity of the second backflow air pressure measuring device 3 is connected to the outlet pipeline of the molten salt pump 1, and the second backflow air pressure measuring device 3 is used to collect the outlet pressure of the molten salt pump.

[0119] The inlet pressure of the molten salt pump 1 and the outlet pressure of the molten salt pump 1 are indirectly measured by the backflow air pressure measuring device, so as to achieve the measurement of the inlet pressure of the molten salt pump 1 and the outlet pressure of the molten salt pump 1.

[0120] Specifically, as shown in Figure 3, the flow value is measured by the flow measurement well 4, the first backflow air pressure measuring device 2 is provided with a first pressure measuring device 21 and a first pressure regulating device 22, and the second backflow air pressure measuring device 3 is provided with a second pressure measuring device 31 and a second pressure regulating device 32. The first pressure measuring device 21 and the second pressure measuring device 31 are used to measure the gas pressure in the cavity, and the first pressure regulating device 22 and the second pressure regulating device 32 are used to regulate the gas pressure in the cavity according to the gas pressure measured by the first pressure measuring device 21 and the second pressure measuring device 31.

[0121] Specifically, as shown in Figure 3, the first backflow air pressure measuring device 2 is provided with a first temperature measuring device 23 and a first temperature regulating device 24, and the second backflow air pressure measuring device 3 is provided with a second temperature measuring device 33 and a second temperature regulating device 34. The first temperature measuring device 23 and the second temperature measuring device 33 are used to measure the temperature in the cavity, and the first temperature regulating device 24 and the second temperature regulating device 34 are used to adjust the temperature in the cavity according to the temperature measured by the first temperature measuring device 23 and the second temperature measuring device 33.

[0122] In an embodiment of the present application, the first pressure measuring device 21 and the second pressure measuring device 31 can be a pressure transmitter, which measures the gas pressure in the cavity. The first pressure measuring device 21 and the second pressure measuring device 31 can also be pressure sensors, etc., which are not limited here. The first pressure regulating device 22 and the second pressure regulating device 32 can be air valves, which maintain the liquid level of the molten salt in the backflow device by putting in or releasing compressed air. The first pressure regulating device 22 and the second pressure regulating device 32 can also be pressure regulators, which are not limited here. When the pressure of the molten salt is relatively high, compressed air is injected through the air valve to prevent the molten salt from filling the backflow air device. When the pressure of the molten salt is low, air is extracted through the air valve to prevent air from entering the molten salt heat storage system.

[0123] As shown in Figure 3, the first temperature regulating device 24 and the second temperature regulating device 34 are used to monitor the temperature of the molten salt in real time before it enters the backflow air pressure measuring device to ensure the fluidity of the cold molten salt. The first temperature regulating device 24 and the second temperature regulating device 34 can be infrared thermometers or other temperature measuring devices, which are not limited here. The first temperature measuring device 23 and the second temperature measuring device 33 can be electric heating devices to maintain the temperature of the molten salt. The first temperature measuring device 23 and the second temperature measuring device 33 can also be resistance wires, which are not limited here, to ensure the fluidity of the molten salt and prevent the molten salt from condensing and clogging the backflow air pressure measuring device, affecting the accuracy of the pressure measurement.

[0124] As shown in Figure 3, the molten salt pump operating point determination system also includes a heat absorber 5, a cold molten salt storage tank 6 and a hot molten salt storage tank 7. The heat absorber 5 can absorb excess heat, and the molten salt can be stored in the cold molten salt storage tank 6, the first backflow air pressure measuring device 2, the second backflow air pressure measuring device 3, the heat absorber 5, and the hot molten salt storage tank 7.

[0125] The walls of the first backflow air pressure measuring device 2 and the second backflow air pressure measuring device 3 are also provided with scale lines to facilitate reading the height of the molten salt liquid column.

[0126] This embodiment also provides a molten salt pump operating point determination device, which is used to implement the above-mentioned embodiments and optional implementations. Details already described are omitted. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0127] This embodiment provides a device for obtaining the operating point of a molten salt pump, as shown in FIG4 , including:

[0128] The acquisition module 401 is used to respectively acquire the inlet pressure and the outlet pressure of the molten salt pump.

[0129] The detection module 402 is used to adjust the outlet flow of the molten salt pump and detect the molten salt data corresponding to different outlet flow rates. The molten salt data includes: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height, and the outlet molten salt liquid column height.

[0130] The first calculation module 403 is used to calculate the lift values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates.

[0131] The determination module 404 is configured to determine the operating point of the molten salt pump based on the static head value corresponding to the molten salt pump and the head values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0132] In some optional implementations, the acquisition module 401 includes:

[0133] The first acquisition unit is used to respectively set a backflow air pressure measuring device at the inlet and outlet of the molten salt pump, and acquire the gas pressure measured by the backflow air pressure measuring device.

[0134] The first determining unit is configured to determine the inlet pressure and the outlet pressure of the molten salt pump based on the gas pressure measured by the backflow air pressure measuring device.

[0135] In some optional implementations, the determining module 404 includes:

[0136] The second determining unit is configured to determine a hydraulic performance curve corresponding to the molten salt pump based on lift values ​​of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

[0137] The first calculation unit is configured to calculate the device head corresponding to different outlet flow rates based on the static head value.

[0138] The second calculation unit is used to determine the device characteristic curve corresponding to the molten salt pump transporting the clean water medium based on the device head corresponding to different outlet flow rates.

[0139] The third determining unit is configured to determine the intersection of the hydraulic performance curve and the device characteristic curve as the operating point of the molten salt pump.

[0140] In some optional implementations, the determining module 404 further includes:

[0141] The second acquisition unit is used to respectively acquire a first geometric height of the molten salt liquid level in the cold molten salt storage tank connected to the molten salt pump and a second geometric height of the molten salt liquid level in the hot molten salt storage tank connected to the molten salt pump.

[0142] The static head value obtaining unit is used to calculate the difference between the first geometric height and the second geometric height to obtain the static head value corresponding to the molten salt pump.

[0143] In some optional embodiments, the device further comprises:

[0144] The second calculation module is used to calculate the effective power of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates based on the average density of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates and the head value of the molten salt medium transported by the molten salt pump.

[0145] The third calculation module is used to obtain the input power and efficiency of the molten salt pump motor, and calculate the shaft power of the molten salt pump for transporting the molten salt medium based on the input power and efficiency of the motor.

[0146] The fourth calculation module is used to calculate the efficiency of the molten salt pump transporting the clean water medium corresponding to different outlet flow rates based on the shaft power and the effective power of the molten salt pump transporting the molten salt medium corresponding to different outlet flow rates.

[0147] In some optional embodiments, the device further comprises:

[0148] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0149] The molten salt pump operating point determination device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0150] An embodiment of the present application further provides a computer device having the molten salt pump operating point determination device shown in FIG. 4 .

[0151] Please refer to Figure 5, which is a structural diagram of a computer device provided by an optional embodiment of the present application. As shown in Figure 5, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in or on the memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 5 takes a processor 10 as an example.

[0152] The processor 10 may be a central processing unit (CPU), a network processor (NPU), or a combination thereof. The processor 10 may also include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device (PLD) may be a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a general purpose array logic (GAL), or any combination thereof.

[0153] The memory 20 stores instructions that can be executed by at least one processor 10, so as to enable at least one processor 10 to execute the method shown in the above embodiment.

[0154] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device 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 combinations thereof.

[0155] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0156] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means, and FIG5 shows a bus connection as an example.

[0157] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, etc. The output device 40 can include a display device, etc.

[0158] The embodiments of the present application also provide a computer-readable storage medium. The above-mentioned method according to the embodiment of the present application can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; optionally, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0159] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A method for obtaining the operating point of a molten salt pump, characterized in that, The method includes: Obtaining the inlet pressure and outlet pressure of the molten salt pump respectively; Adjusting the outlet flow rate of the molten salt pump, and detecting molten salt data corresponding to different outlet flow rates, where the molten salt data includes: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height, and the outlet molten salt liquid column height; Based on the inlet pressure and outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates, calculating the head values of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates respectively; Based on the static head value corresponding to the molten salt pump and the head values of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates, determining the operating point of the molten salt pump.

2. The method according to claim 1, characterized in that, The obtaining the inlet pressure and outlet pressure of the molten salt pump respectively includes: Respectively arranging backflow air pressure measuring devices at the inlet and outlet of the molten salt pump, and obtaining the gas pressures measured by the backflow air pressure measuring devices; Based on the gas pressures measured by the backflow air pressure measuring devices, determining the inlet pressure and outlet pressure of the molten salt pump.

3. The method according to claim 1, wherein The determining the operating point of the molten salt pump includes: Based on the head values of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates, determining the hydraulic performance curve corresponding to the molten salt pump; Calculating the device head corresponding to different outlet flow rates based on the static head value; Based on the device head corresponding to different outlet flow rates, determining the device characteristic curve corresponding to the molten salt pump transporting clear water medium; Determining the intersection point of the hydraulic performance curve and the device characteristic curve as the operating point of the molten salt pump.

4. The method according to claim 1, characterized in that, Calculating the static head value corresponding to the molten salt pump in the following way: Respectively obtaining the first geometric height of the molten salt liquid level in the cold molten salt storage tank connected to the molten salt pump and the second geometric height of the molten salt liquid level in the hot molten salt storage tank connected to the molten salt pump; Calculating the difference between the first geometric height and the second geometric height to obtain the static head value corresponding to the molten salt pump.

5. The method according to claim 1, wherein The method further includes: Based on the average density of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates and the head values of the molten salt medium transported by the molten salt pump, calculating the effective power of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates; Obtaining the input power and efficiency of the molten salt pump motor, and calculating the shaft power of the molten salt pump transporting the molten salt medium based on the input power and efficiency of the motor; Based on the shaft power and the effective power of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates, calculating the efficiency of the molten salt pump transporting clear water medium corresponding to different outlet flow rates.

6. A molten salt pump operating point calculation system, characterized in that, The system includes a backflow air pressure measuring device and a controller. The backflow air pressure measuring device includes a first backflow air pressure measuring device and a second backflow air pressure measuring device. Among them, The first backflow air pressure measuring device is installed at the inlet of the molten salt pump. The cavity of the first backflow air pressure measuring device is connected to the inlet pipeline of the molten salt pump, and the first backflow air pressure measuring device is used to collect the inlet pressure of the molten salt pump; The second backflow air pressure measuring device is installed at the outlet of the molten salt pump. The cavity of the second backflow air pressure measuring device is connected to the outlet pipeline of the molten salt pump, and the second backflow air pressure measuring device is used to collect the outlet pressure of the molten salt pump; The controller is used to execute the method for obtaining the operating point of the molten salt pump according to any one of claims 1-5.

7. The system according to claim 6, wherein both the first backflow air pressure measuring device and the second backflow air pressure measuring device are provided with a pressure measuring device and a pressure regulating device; the pressure measuring device is used to measure the gas pressure in the cavity, and the pressure regulating device is used to regulate the gas pressure in the cavity according to the gas pressure measured by the pressure measuring device; the first backflow air pressure measuring device and the second backflow air pressure measuring device are also provided with a temperature measuring device and a temperature regulating device, wherein the temperature measuring device is used to measure the temperature in the cavity; the temperature regulating device is used to regulate the temperature in the cavity according to the temperature measured by the temperature measuring device.

8. A device for obtaining the operating point of a molten salt pump, characterized in that, The device includes: an acquisition module, configured to respectively acquire the inlet pressure and the outlet pressure of the molten salt pump; a detection module, configured to adjust the outlet flow rate of the molten salt pump and detect the molten salt data corresponding to different outlet flow rates, where the molten salt data includes: the average density of the molten salt medium transported by the molten salt pump, the inlet molten salt flow rate, the outlet molten salt flow rate, the inlet molten salt liquid column height, and the outlet molten salt liquid column height; a first calculation module, configured to respectively calculate the head values of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates based on the inlet pressure and the outlet pressure of the molten salt pump and the molten salt data corresponding to different outlet flow rates; a determination module, configured to determine the operating point of the molten salt pump based on the static head value corresponding to the molten salt pump and the head values of the molten salt medium transported by the molten salt pump corresponding to different outlet flow rates.

9. A computer device, characterized in that, including: a memory and a processor, the memory and the processor are communicatively connected to each other, and the memory stores computer instructions, and the processor executes the computer instructions to execute the method for obtaining the operating point of the molten salt pump according to any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, Computer instructions are stored on the computer-readable storage medium, and the computer instructions are used to cause a computer to execute the method for obtaining the operating point of the molten salt pump according to any one of claims 1-5.

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