Tower type solar molten salt heat absorber protection control method, system and storage medium

Abstract

The embodiment of the present invention provides a tower solar molten salt absorber protection control method, system and storage medium, which belongs to the technical field of solar thermal power stations. The method includes: obtaining meteorological forecast data and tower solar thermal power station system operating parameters; using the principle of balancing the power consumption of the cycle condition and the power consumption of the salt withdrawal and restart, and calculating the maximum cycle time according to the tower solar thermal power station system operating parameters; determining the operating condition of the tower solar thermal power station system when cloud shading occurs according to the meteorological forecast data and the maximum cycle time; and controlling the operation of the tower solar thermal power station system according to the operating condition. The method determines the maximum cycle time by using the principle of balancing the power consumption of the cycle condition and the power consumption of the salt withdrawal and restart, and then determines the operating condition of the tower solar thermal power station system when cloud shading occurs according to the maximum cycle time and the expected cloud shading time, which can reduce the number of starts and stops of the tower solar thermal power station system while maximally saving energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of photothermal power stations, and in particular to a tower-type solar molten salt heat absorber protection control method, a tower-type solar molten salt heat absorber protection control system and a machine-readable storage medium. Background Art

[0002] From the perspective of ensuring energy security and promoting sustainable development, solar power generation technology is an effective means to alleviate the current energy crisis and has broad application prospects.

[0003] Solar thermal power generation mainly includes three types: trough, dish and tower. The solar tower molten salt power station mainly consists of three parts: a concentrating and collecting system consisting of heliostats and the absorber on the top of the heat absorption tower, a heat storage and exchange system consisting of high and low temperature heat storage tanks and steam generators, and a power generation system consisting of a steam turbine generator set and its auxiliary equipment.

[0004] There are many cloudy areas in China with rich radiation resources. When cloud cover appears, the solar radiation energy received by the heat absorber will drop sharply. However, the heat dissipation of the heat absorber will continue, so the wall temperature of the heat absorber will drop sharply. In serious cases, it may even cause the molten salt working fluid in the heat absorber to solidify, causing fatal damage to the heat absorber. In addition, when the cloud cover disappears, the solar radiation energy received by the heat absorber suddenly increases significantly. This part of the newly added direct solar radiation can only be used for preheating and partial load operation cycles until the temperature parameters of the molten salt at the heat absorber outlet are reached, and it cannot be used continuously for power generation.

[0005] The current control strategy adopted by the power station for short-term cloud cover is to let the heliostat track the heating surface of the heat absorber, set the working fluid flow in the heat absorber to above the rated flow, and prevent the heat absorber from overheating due to the solidification of molten salt and the sudden appearance of direct solar radiation DNI by increasing the large flow circulation in the heat absorber. At this time, the heat absorber electric heating system is on standby and responds to operation at any time according to the monitored temperature parameters. However, in the face of long-term cloud cover, the only strategy is to remove the salt. Summary of the invention

[0006] The purpose of the embodiments of the present invention is to provide a tower-type solar molten salt heat absorber protection control method, system and storage medium to solve the deficiency of the existing technical solutions that cannot adapt well to the radiation fluctuation caused by cloud obstruction.

[0007] In order to achieve the above object, an embodiment of the present invention provides a tower-type solar molten salt heat absorber protection control method, the method comprising:

[0008] Obtain weather forecast data and tower CSP power station system operating parameters;

[0009] The maximum cycle time is calculated according to the operating parameters of the tower CSP power station system by utilizing the power consumption balance principle of the cycle condition and the power consumption of the salt withdrawal and restart;

[0010] Determining the operating condition of the tower solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration;

[0011] The operation of the tower-type solar thermal power station system is controlled according to the operating conditions.

[0012] According to the above technical means, the method determines the maximum cycle time by utilizing the principle of balancing the power consumption of the cyclic operating conditions and the power consumption of salt withdrawal and restart. Then, the operating conditions of the tower solar thermal power station system when cloud obstruction occurs are determined based on the maximum cycle time and the expected cloud obstruction duration. This can reduce the number of starts and stops of the tower solar thermal power station system while maximizing energy savings.

[0013] In some feasible embodiments, determining the operating condition of the tower solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration includes:

[0014] Obtaining cloud cover duration from the weather forecast data;

[0015] Comparing the cloud cover duration with the maximum cycle duration;

[0016] If the cloud shielding duration is greater than the maximum cycle duration, it is determined that when cloud shielding occurs, the operating condition of the tower-type solar thermal power station system is the salt removal condition;

[0017] If the cloud blocking duration is less than the maximum cycle duration, it is determined that when cloud blocking occurs, the operating condition of the tower solar thermal power station system is a cycle condition.

[0018] In some feasible embodiments, the calculating the maximum cycle time according to the operating parameters of the tower solar thermal power station system includes:

[0019] Determining the power consumption of the tower-type CSP power station system for salt removal and restart according to the operating parameters of the tower-type CSP power station system;

[0020] The maximum cycle time is calculated using the principle of balancing the power consumption of the cyclic operating condition and the power consumption of salt removal and restart.

[0021] In some feasible embodiments, the power consumption of the salt withdrawal restart is calculated by the following formula:

[0022] P r =N e ×(h pr +h z +h o )+ΔDNI×A×η o-e +Nc (h z +h o );

[0023] Among them, P r Represents the power consumption of the salt removal and restart condition, N e Represents the electric heating power, N c Represents the power of the cold salt pump, h pr Represents the duration of the warm-up phase, h z Represents the duration of the salt injection phase, h o represents the duration of the gradual load increase phase, ΔDNI represents the direct solar radiation during the restart period, A represents the mirror field area, η o-e Represents photoelectric efficiency.

[0024] In some feasible embodiments, the maximum cycle time is calculated using the power consumption balance principle of the cycle condition and the power consumption of the salt withdrawal restart, including:

[0025] Calculate the molten salt heat capacity of the cold salt tank based on the operating parameters of the tower solar thermal power station system;

[0026] The maximum cycle time is calculated based on the molten salt heat capacity, the power consumption of salt withdrawal and restart, and the operating parameters of the tower solar thermal power station system.

[0027] In some feasible embodiments, the heat capacity of the molten salt is calculated by the following formula:

[0028] Q=C p ×△T×ρ×S×H / 3600000000;

[0029] Where Q represents the heat capacity of the molten salt tank, C p represents the average specific heat capacity, △T represents the temperature difference of molten salt, ρ represents the average density of molten salt, S represents the bottom area of ​​molten salt tank, and H represents the effective molten salt height of molten salt tank.

[0030] In some feasible embodiments, the power consumption of the cyclic working condition is calculated according to the following formula:

[0031] P c =(ΔQ a ×η h-e +N c )×h;

[0032] Among them, P c Represents the power consumption of the cycle condition, ΔQ a Represents the heat dissipation of the absorber, η h-e Represents the thermoelectric efficiency, N c represents the power of the cold salt pump, and h represents the cycle time;

[0033] Let the power consumption of the cycle condition be equal to the power consumption of removing salt and restarting, let the heat dissipation of the absorber be equal to the heat capacity of the salt, and calculate the maximum cycle time according to the calculation formula for the power consumption of the cycle condition.

[0034] In some feasible embodiments, the method further includes: in the event of cloud cover, controlling the heat absorber protection device to open.

[0035] According to the above technical paragraphs, when cloud cover occurs, a protective device is used to cover the surface of the absorber. The protective layer and the air layer between the absorber and the absorber are used to isolate the absorber from the external low temperature and high wind speed environment, thereby minimizing heat dissipation losses. Since the heat dissipation of the absorber is reduced, the circulation time of the molten salt from the absorber to the cold salt tank can be extended, and the number of shutdowns and starts can be greatly reduced.

[0036] A second aspect of the present application provides a tower-type solar molten salt heat absorber protection control system, the system comprising:

[0037] A data acquisition unit, used to obtain meteorological forecast data and tower-type CSP power station system operating parameters;

[0038] A calculation unit, used for calculating the maximum cycle time according to the operating parameters of the tower type solar thermal power station system;

[0039] A judgment unit, used to determine the operating condition of the tower-type solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration;

[0040] An execution unit is used to control the operation of the tower-type solar thermal power station system according to the operating conditions.

[0041] The third aspect of the present application provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the tower solar molten salt absorber protection control method described in the present application.

[0042] Through the above technical scheme, the method determines the maximum cycle time by utilizing the principle of balancing the power consumption of the cyclic operating conditions and the power consumption of salt removal and restart, and then determines the operating conditions of the tower solar thermal power station system when cloud obstruction occurs based on the maximum cycle time and the expected cloud obstruction duration. This can maximize energy savings while reducing the number of starts and stops of the tower solar thermal power station system.

[0043] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0045] Figure 1 This is a topological diagram of a tower-type solar thermal power station system provided in one embodiment of the present application;

[0046] Figure 2 This is a schematic diagram of six operating states of a tower-type solar thermal power station and their logical conversion provided by an embodiment of the present application;

[0047] Figure 3 This is a flow chart of a tower-type solar molten salt heat absorber protection control method provided in one embodiment of the present application;

[0048] Figure 4 This is a heat absorber startup time curve provided in one embodiment of the present application.

[0049] Figure 5 It is a heat capacity storage curve corresponding to the effective molten salt height provided in one embodiment of the present application. DETAILED DESCRIPTION

[0050] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0051] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of national laws and regulations. In the embodiments of this application, some existing solutions in the industry such as certain software, components, and models may be mentioned, which should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0052] like Figure 1 As shown in the figure, the solar tower molten salt power station is mainly composed of three parts: a concentrating and collecting system consisting of heliostats and the absorber on the top of the heat absorption tower, a heat storage and exchange system consisting of high and low temperature heat storage tanks and steam generators, and a power generation system consisting of a steam turbine generator set and its auxiliary equipment.

[0053] Focusing on the absorber, according to the sequence of start-up and shutdown actions of the power station under different working conditions, the operation state of the CSP power station can be designed as follows: Figure 2 The six types shown are basically defined as follows:

[0054] (1) Shutdown state: The power station is in a shutdown state after the steam turbine generator sets have experienced load reduction, temperature and pressure reduction, unit decoupling, heliostats in each area shifting from tracking state to natural orientation state, shutdown of each receiver, shutdown of energy storage and auxiliary boiler systems, and turbine speed reduction until shutdown.

[0055] (2) Standby state: After receiving the command from the whole-field control system, the heliostat field focuses the light of the naturally oriented heliostats to several set points in the sky to prevent the light path of the heliostat field from deviating from the set area and affecting the surrounding environment.

[0056] (3) Normal early morning start-up state: The heliostats in each region start from the natural orientation, and after the standby state, they track and reflect the focused direct solar radiation DNI to the heating surface of the absorber, start the absorber, and go through the process of heating up and warming up the pipes. When the outlet parameters of the steam generation system meet the standards, the turbine is started up, and the turbine rotor is increased from static to rated speed. The generator is connected to the grid to carry the grid load.

[0057] (4) Cold / hot start status: A cold start is when the entire heliostat field is restarted after being in standby mode after the last operation. A hot start is when the receiver and steam turbine are decoupled due to low radiation DNI, the influence of wind speed on the heliostat field, etc., and the steam turbine generator set has been shut down for a short time and the metal temperature is high. When the external conditions such as radiation and wind speed change and the receiver can operate again, the start is started when the radiation and wind speed change and the receiver can operate again.

[0058] (5) Normal operating status: After the above-mentioned startups are completed, the operating status of the entire power station is directly related to the changes in the power generation capacity and direct solar radiation DNI.

[0059] (6) Cloud cover operation state: When the irradiance intensity of the concentrated light to the heat receiving surface of the heat absorber is lower than the lower limit for N time steps, the heliostat field is deflected to the standby state. When the steam inlet parameter of the steam turbine is lower than the set value and the energy storage is sufficient, the energy storage system automatically supplies steam. When the direct solar radiation DNI value returns to above the lower limit, the heliostats are re-focused to the heat receiving surface of the heat absorber.

[0060] The existing technical solutions have the following shortcomings: 1) In the existing technical solutions, when faced with long-term cloud cover, the molten salt will solidify in the tower receiver, and only the salt withdrawal strategy can be adopted; 2) When the long-term cloud cover disappears, the sudden appearance of direct solar radiation DNI will cause the receiver to overheat, and the existing technical solutions cannot adapt well to the fluctuations caused by such cloud cover.

[0061] Figure 3 This is a flow chart of a tower solar molten salt heat absorber protection control method provided by an embodiment of the present invention. Figure 3 As shown, an embodiment of the present invention provides a tower-type solar molten salt heat absorber protection control method, the method comprising:

[0062] S1: Obtain weather forecast data and tower-type CSP power station system operating parameters. In the embodiment of the present application, the tower-type CSP power station system operating parameters may include thermoelectric efficiency, cold salt pump power, effective molten salt height of the molten salt tank, electric heating power, direct solar radiation, etc. The weather forecast data mainly includes the predicted cloud cover duration within the CSP power station.

[0063] S2: Utilizing the principle of balancing the power consumption of the cycle condition and the power consumption of the salt withdrawal and restart, the maximum cycle time is calculated according to the operating parameters of the tower CSP power station system.

[0064] In some feasible embodiments, the calculating the maximum cycle time according to the operating parameters of the tower solar thermal power station system includes:

[0065] First, the power consumption of the tower CSP system for salt removal and restart is determined according to the operating parameters of the tower CSP system. The power consumption of salt removal and restart is mainly reflected in the power consumption of the three stages of preheating, salt injection and gradual load increase required in the restart process. Figure 4 As shown, the start-up of the absorber is usually divided into several stages: preheating, salt injection, gradual temperature increase, partial load operation, and normal operation. In the preheating stage, the absorber and pipeline electric heating system are first started, and the heliostat field mobilizes the heliostats to preheat the absorber surface. At the same time, an infrared thermal imager is used to observe the absorber surface temperature, monitor the heating rate and the absorber surface temperature; in the salt injection stage, after the electric heating and the mirror field are running, the cold salt tank molten salt pump is started to circulate the molten salt back and forth between the absorber and the cold salt tank. When the hot salt temperature at the absorber outlet reaches 400℃, the hot salt is cut to the hot tank. As the heat load of the absorber increases, the speed of the molten salt pump and the number of units put into use are gradually increased to ensure that the absorber outlet temperature is within the allowable range until normal operation.

[0066] In some feasible embodiments, the power consumption of the salt withdrawal restart is calculated by the following formula: r =N e ×(h pr +h z +h o )+ΔDNI×A×η o-e +N c (h z +h o );

[0067] Among them, P r Represents the power consumption of the salt removal and restart condition, in kWh, N e Represents the electric heating power in kW, N c Represents the power of the cold salt pump, in kW, h pr Represents the duration of the preheating phase, in h, h z Represents the duration of the salt injection phase, in h, h o represents the duration of the gradual load increase phase, in h, ΔDNI represents the direct solar radiation during the restart period, in kWh, and A represents the mirror field area, in m 2 , usually 10% of the total area of ​​the mirror field, η o-e Represents photoelectric efficiency.

[0068] Then, the maximum cycle time is calculated using the principle of balancing the power consumption of the cycle condition and the power consumption of salt withdrawal and restart.

[0069] In some feasible embodiments, the maximum cycle time is calculated using the power consumption balance principle of the cycle condition and the power consumption of the salt withdrawal restart, including:

[0070] The molten salt heat capacity of the cold salt tank is calculated according to the operating parameters of the tower solar thermal power station system. In some feasible embodiments, the molten salt heat capacity is calculated by the following formula:

[0071] Q=C p ×△T×ρ×S×H / 3600000000;

[0072] Where Q represents the heat capacity of the molten salt tank in MW ht , C p represents the average specific heat capacity in J / kg·K, △T represents the temperature difference of the molten salt, and ρ represents the average density of the molten salt in kg / m 3 , S represents the bottom area of ​​the molten salt tank, in m 2 , H represents the effective molten salt height of the molten salt tank, in meters. Figure 5 As shown in the figure, the molten salt height and the storage tank heat capacity storage curve show that the cold salt tank can provide heat capacity for the molten salt to circulate between the heat absorber and the cold salt tank. When the effective height of the molten salt in the cold salt tank is above 2m, it can provide at least 66.2MW of heat.

[0073] Then, the maximum cycle time is calculated based on the molten salt heat capacity, the power consumption of salt withdrawal and restart, and the operating parameters of the tower solar thermal power station system.

[0074] In some feasible embodiments, the power consumption of the cyclic working condition is calculated according to the following formula:

[0075] P c =(ΔQ a ×η h-e +N c )×h;

[0076] Among them, P c Represents the power consumption of the cycle condition, ΔQ a Represents the heat dissipation of the absorber, η h-e Represents the thermoelectric efficiency, N c represents the power of the cold salt pump, and h represents the cycle time;

[0077] Set the power consumption of the cycle condition equal to the power consumption of restarting after removing salt, set the heat dissipation of the absorber equal to the heat capacity of salt, and calculate the maximum cycle time according to the power consumption calculation formula of the cycle condition. According to the above technical means, the power consumption of the cycle condition equal to the power consumption of restarting after removing salt is the critical point of using the cycle condition and the salt withdrawal condition. When the power consumption of the cycle condition is less than the salt withdrawal condition, the cycle condition can save more energy. Conversely, the salt withdrawal condition can save more energy. Setting the heat dissipation of the absorber equal to the heat capacity of salt can ensure that the cycle condition of the molten salt from the absorber to the cold salt tank can proceed smoothly.

[0078] S3: Determine the operating condition of the tower solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration.

[0079] In some feasible embodiments, determining the operating condition of the tower solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration includes:

[0080] Obtaining cloud cover duration from the weather forecast data;

[0081] Comparing the cloud cover duration with the maximum cycle duration;

[0082] If the cloud shielding duration is greater than the maximum cycle duration, it is determined that when cloud shielding occurs, the operating condition of the tower-type solar thermal power station system is the salt removal condition;

[0083] If the cloud blocking duration is less than the maximum cycle duration, it is determined that when cloud blocking occurs, the operating condition of the tower solar thermal power station system is a cycle condition.

[0084] The circulation condition refers to the reciprocating circulation of molten salt between the absorber and the cold salt tank, that is, when there is no solar energy, the molten salt at the outlet of the absorber enters the low-temperature molten salt tank at a temperature below 400°C, and the molten salt then enters the absorber from the low-temperature molten salt tank, and circulates back and forth. The salt withdrawal condition is to empty the molten salt in the absorber and restart it when the irradiation DNI meets the requirements. In this case, the absorber and the steam turbine are decoupled, and the steam turbine generator set is not shut down for a long time. The metal temperature is still at a relatively high temperature level. When external conditions such as irradiation and wind speed change, the absorber meets the requirements for restarting when it is in operation again.

[0085] S4: Controlling the operation of the tower-type solar thermal power station system according to the operating conditions.

[0086] According to the above technical means, the method determines the maximum cycle time by utilizing the principle of balancing the power consumption of the cyclic operating conditions and the power consumption of salt withdrawal and restart. Then, the operating conditions of the tower solar thermal power station system when cloud obstruction occurs are determined based on the maximum cycle time and the expected cloud obstruction duration. This can reduce the number of starts and stops of the tower solar thermal power station system while maximizing energy savings.

[0087] It has stronger adaptability to the fluctuations of direct solar radiation during and after cloud cover, which can extend the circulation time of the molten salt working fluid in the absorber, reduce the number of salt withdrawals, and enhance the continuity of the absorber operation.

[0088] In some feasible embodiments, the method further includes: in the event of cloud cover, controlling the heat absorber protection device to open.

[0089] According to the above technical paragraphs, when cloud shading occurs, the surface of the absorber is covered with a protective device, and the protective layer and the air layer between the absorber and the absorber are used to isolate the absorber from the external low temperature and high wind speed environment, thereby minimizing heat loss. Due to the reduced heat dissipation of the absorber, the circulation time of the molten salt from the absorber to the cold salt tank can be extended, and the number of shutdowns and starts can be greatly reduced. Especially in areas with abundant solar energy resources and frequent cloud shading, the use of tower solar cloud shading protective devices can improve the thermal efficiency and economy of tower solar systems.

[0090] A second aspect of the present application provides a tower-type solar molten salt heat absorber protection control system, the system comprising:

[0091] A data acquisition unit, used to obtain meteorological forecast data and tower-type CSP power station system operating parameters;

[0092] A calculation unit, used for calculating the maximum cycle time according to the operating parameters of the tower type solar thermal power station system;

[0093] A judgment unit, used to determine the operating condition of the tower-type solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration;

[0094] An execution unit is used to control the operation of the tower-type solar thermal power station system according to the operating conditions.

[0095] The third aspect of the present application provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the tower solar molten salt absorber protection control method described in the present application.

[0096] Through the above technical scheme, the method determines the maximum cycle time by utilizing the principle of balancing the power consumption of the cyclic operating conditions and the power consumption of salt removal and restart, and then determines the operating conditions of the tower solar thermal power station system when cloud obstruction occurs based on the maximum cycle time and the expected cloud obstruction duration. This can maximize energy savings while reducing the number of starts and stops of the tower solar thermal power station system.

[0097] The embodiment of the present invention provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: (method claim steps, sole right + subordinate right). The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0098] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0099] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0100] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0101] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0102] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0103] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0104] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0105] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0106] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A tower type solar molten salt heat absorber protection control method, characterized in that: The method comprises: Obtain weather forecast data and tower CSP power station system operating parameters; The maximum cycle time is calculated according to the operating parameters of the tower CSP power station system by utilizing the power consumption balance principle of the cycle condition and the power consumption of the salt withdrawal and restart; Determining the operating condition of the tower solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration; The operation of the tower-type solar thermal power station system is controlled according to the operating conditions.

2. The tower type solar molten salt heat absorber protection control method according to claim 1 is characterized in that: The determining, according to the meteorological forecast data and the maximum cycle duration, the operating condition of the tower-type solar thermal power station system when cloud cover occurs includes: Obtaining cloud cover duration from the weather forecast data; Comparing the cloud cover duration with the maximum cycle duration; If the cloud shielding duration is greater than the maximum cycle duration, it is determined that when cloud shielding occurs, the operating condition of the tower-type solar thermal power station system is the salt removal condition; If the cloud blocking duration is less than the maximum cycle duration, it is determined that when cloud blocking occurs, the operating condition of the tower solar thermal power station system is a cycle condition.

3. The tower type solar molten salt heat absorber protection control method according to claim 1 is characterized in that: The calculating the maximum cycle time according to the operating parameters of the tower type solar thermal power station system includes: Determining the power consumption of the tower-type CSP power station system for salt removal and restart according to the operating parameters of the tower-type CSP power station system; The maximum cycle time is calculated using the principle of balancing the power consumption of the cyclic operating condition and the power consumption of salt removal and restart.

4. The tower type solar molten salt heat absorber protection control method according to claim 3 is characterized in that: The power consumption of the salt withdrawal restart is calculated by the following formula: P r =N e ×(h pr +h z +h o )+ΔDNI×A×η o-e +N c (h z +h o ); Among them, P r Represents the power consumption of the salt removal and restart condition, N e Represents the electric heating power, N c Represents the power of the cold salt pump, h pr Represents the duration of the warm-up phase, h z Represents the duration of the salt injection phase, h o represents the duration of the gradual load increase phase, ΔDNI represents the direct solar radiation during the restart period, A represents the mirror field area, η o-e Represents photoelectric efficiency.

5. The tower type solar molten salt heat absorber protection control method according to claim 3 is characterized in that: The maximum cycle time is calculated using the power consumption balance principle of the cycle condition and the power consumption of salt withdrawal and restart, including: Calculate the molten salt heat capacity of the cold salt tank based on the operating parameters of the tower solar thermal power station system; The maximum cycle time is calculated based on the molten salt heat capacity, the power consumption of salt withdrawal and restart, and the operating parameters of the tower solar thermal power station system.

6. The tower type solar molten salt heat absorber protection control method according to claim 5 is characterized in that: The heat capacity of the molten salt is calculated by the following formula: Q=C p ×△T×ρ×S×H / 3600000000; Where Q represents the heat capacity of the molten salt tank, C p represents the average specific heat capacity, △T represents the temperature difference of molten salt, ρ represents the average density of molten salt, S represents the bottom area of ​​molten salt tank, and H represents the effective molten salt height of molten salt tank.

7. The tower type solar molten salt heat absorber protection control method according to claim 5 is characterized in that: The power consumption of the cycle condition is calculated according to the following formula: P c =(ΔQ a ×η h-e +N c )×h; Among them, P c Represents the power consumption of the cycle condition, ΔQ a Represents the heat dissipation of the absorber, η h-e Represents the thermoelectric efficiency, N c represents the power of the cold salt pump, and h represents the cycle time; Let the power consumption of the cycle condition be equal to the power consumption of removing salt and restarting, let the heat dissipation of the absorber be equal to the heat capacity of the salt, and calculate the maximum cycle time according to the calculation formula for the power consumption of the cycle condition.

8. The tower type solar molten salt heat absorber protection control method according to claim 1 is characterized in that: The method further comprises: in the case of cloud cover, controlling the heat absorber protection device to open.

9. A tower type solar molten salt heat absorber protection control system, characterized in that: The system comprises: A data acquisition unit, used to obtain meteorological forecast data and tower-type CSP power station system operating parameters; A calculation unit, used for calculating the maximum cycle time according to the operating parameters of the tower type solar thermal power station system; A judgment unit, used to determine the operating condition of the tower-type solar thermal power station system when cloud cover occurs according to the meteorological forecast data and the maximum cycle duration; An execution unit is used to control the operation of the tower-type solar thermal power station system according to the operating conditions.

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions for enabling the machine to execute the tower solar molten salt thermal absorber protection control method described in any one of claims 1 to 8 of the present application.

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