Unit control method, device, equipment and medium

Abstract

The present application discloses a unit control method, device, equipment and medium, relating to the field of computer technology. The unit includes a boiler system and a molten salt system. The method includes: obtaining the superheated steam power and the reheated steam power of the molten salt system; determining the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power; using the equivalent electric power of the molten salt system to correct the detected value of the actual generated electric power to obtain a corrected value of the actual generated electric power; and controlling the unit according to the corrected value of the actual generated electric power. This method can improve the accuracy of control.

Description

Technical Field

[0001] This application relates to the field of computer technology, and in particular, to a unit control method, device, equipment, and medium. Background Art

[0002] The total load of a new type of thermal power unit consists of the boiler load and the molten salt load. There is a large inertia link in the process of the boiler increasing or decreasing the load, and the rate of load increase is slow. Generally, the speed of the unit increasing the load will not exceed 2Pe% per unit time, where Pe refers to the rated power of the unit.

[0003] In the load increase stage, molten salt side heating is used to form superheated steam and reheated steam, which are then respectively sent to a certain stage of the high-pressure cylinder and the intermediate-pressure cylinder of the steam turbine to do work, assisting in realizing the rapid load increase of the coal-fired boiler. In this process, the actual power generation of the coal-fired side is detected to obtain the detected value of the actual power generation, and then the unit is controlled to increase the load based on this detected value.

[0004] However, the detected value of the actual power generation is the result of the combined action of the coal-fired side and the molten salt side. That is, the detected value cannot truly reflect the actual power generation of the coal-fired side, resulting in inaccurate subsequent control. Summary of the Invention

[0005] This application provides a unit control method, device, equipment, and medium, which can improve the accuracy of control.

[0006] In a first aspect, this application provides a unit control method. The unit includes a boiler system and a molten salt system. The method includes:

[0007] Obtain the superheated steam power and the reheated steam power of the molten salt system;

[0008] Determine the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power;

[0009] Use the equivalent electric power of the molten salt system to correct the detected value of the actual power generation to obtain the corrected value of the actual power generation;

[0010] Control the unit according to the corrected value of the actual power generation.

[0011] In some possible implementation manners, the obtaining the superheated steam power of the molten salt system includes:

[0012] Obtain the first energy of the feed water before passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater, and the second energy of the feed water after passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater to generate molten salt steam;

[0013] Obtain the superheated steam power of the molten salt system according to the difference between the second energy and the first energy.

[0014] In some possible implementation manners, the obtaining manner of the reheated steam power is as follows:

[0015] Obtain the third energy before the extraction steam of the high-pressure cylinder passes through the molten salt reheater and the fourth energy after the extraction steam of the high-pressure cylinder passes through the molten salt reheater;

[0016] Obtain the reheated steam power of the molten salt system according to the difference between the fourth energy and the third energy.

[0017] In some possible implementation manners, the determining of the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power includes:

[0018] Determine the equivalent electric power of the superheated steam power according to the superheated steam power, a preset efficiency coefficient, and the loss coefficients corresponding to each regenerative extraction steam point of the high-pressure cylinder;

[0019] Determine the equivalent electric power of the reheated steam power according to the reheated steam power, the preset efficiency coefficient, and the loss coefficients corresponding to each regenerative extraction steam point of the intermediate-pressure cylinder;

[0020] Determine the equivalent electric power of the molten salt system according to the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power.

[0021] In some possible implementation manners, the high-pressure cylinder includes a first regenerative extraction steam point, and the loss coefficient corresponding to the first regenerative extraction steam point of the high-pressure cylinder is determined by the following method:

[0022] Determine the loss coefficient corresponding to the first regenerative extraction steam point according to the superheated steam power, the regenerative extraction steam power at the first regenerative extraction steam point, and the steam power entering the high-pressure cylinder;

[0023] The intermediate-pressure cylinder includes a second regenerative extraction steam point, and the loss coefficient corresponding to the second regenerative extraction steam point of the intermediate-pressure cylinder is determined by the following method:

[0024] Determine the loss coefficient corresponding to the second regenerative extraction steam point according to the reheated steam power, the regenerative extraction steam power at the second regenerative extraction steam point, and the steam power entering the intermediate-pressure cylinder.

[0025] In some possible implementation manners, the steam power entering the high-pressure cylinder is determined by the following method:

[0026] Obtain the steam input power of the boiler system;

[0027] Determine the steam power entering the high-pressure cylinder according to the steam input power of the boiler system, the enthalpy drop of the steam turbine, and the efficiency of the steam turbine.

[0028] In some possible implementation manners, the correcting the detected value of the actual power generation by using the equivalent electric power of the molten salt system includes:

[0029] Subtract the equivalent electric power of the molten salt system from the detected value of the actual power generation.

[0030] In a second aspect, the present application provides a unit control device. The unit includes a boiler system and a molten salt system. The unit load increasing device includes:

[0031] An obtaining module, configured to obtain the superheated steam power and the reheated steam power of the molten salt system;

[0032] A determining module, configured to determine the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power;

[0033] A correcting module, configured to correct the detected value of the actual power generation by using the equivalent electric power of the molten salt system to obtain a corrected value of the actual power generation;

[0034] A control module, configured to control the unit according to the corrected value of the actual power generation.

[0035] In some possible implementation manners, the obtaining module is specifically configured to obtain the first energy of the feed water before passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater, and the second energy of the feed water after passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater to generate molten salt steam; and obtain the superheated steam power of the molten salt system according to the difference between the second energy and the first energy.

[0036] In some possible implementation manners, the obtaining module is specifically configured to obtain the third energy of the extraction steam of the high-pressure cylinder before passing through the molten salt reheater, and the fourth energy of the extraction steam of the high-pressure cylinder after passing through the molten salt reheater; and obtain the reheated steam power of the molten salt system according to the difference between the fourth energy and the third energy.

[0037] In some possible implementation manners, the determining module is specifically configured to determine the equivalent electric power of the superheated steam power according to the superheated steam power, a preset efficiency coefficient, and loss coefficients corresponding to respective regenerative extraction steam locations of the high-pressure cylinder; determine the equivalent electric power of the reheated steam power according to the reheated steam power, the preset efficiency coefficient, and loss coefficients corresponding to respective regenerative extraction steam locations of the intermediate-pressure cylinder; and determine the equivalent electric power of the molten salt system according to the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power.

[0038] In some possible implementation manners, the high-pressure cylinder includes a first regenerative extraction steam location, and the determining module is specifically configured to determine the loss coefficient corresponding to the first regenerative extraction steam location according to the superheated steam power, the regenerative extraction steam power at the first regenerative extraction steam location, and the steam power entering the high-pressure cylinder;

[0039] The intermediate-pressure cylinder includes a second regenerative extraction steam location, and the determining module is specifically configured to determine the loss coefficient corresponding to the second regenerative extraction steam location according to the reheated steam power, the regenerative extraction steam power at the second regenerative extraction steam location, and the steam power entering the intermediate-pressure cylinder.

[0040] In some possible implementation manners, the determining module is specifically configured to obtain the steam input power of the boiler system; and determine the steam power entering the high-pressure cylinder according to the steam input power of the boiler system, the enthalpy drop of the steam turbine, and the efficiency of the steam turbine.

[0041] In some possible implementation manners, the correcting module is specifically configured to subtract the equivalent electric power of the molten salt system from the detected value of the actual generated electric power.

[0042] In a third aspect, the present application provides a control device, including: a memory storing a computer program thereon; and a processor configured to execute the computer program in the memory to implement the steps of the method according to any one of the first aspect.

[0043] In a fourth aspect, the present application provides a computer-readable storage medium storing a computer program thereon, and when the program is executed by a processor, the steps of the method according to any one of the first aspect are implemented.

[0044] To achieve the above object, the present application adopts the following technical solutions:

[0045] The present application provides a unit control method. The unit includes a boiler system and a molten salt system. The method includes obtaining the superheated steam power and the reheated steam power of the molten salt system, determining the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power, using the equivalent electric power of the molten salt system to correct the detected value of the actual generated power, obtaining the corrected value of the actual generated power, and controlling the unit according to the corrected value of the actual generated power. In this method, by calculating the equivalent electric power of the molten salt system and then using the equivalent electric power of the molten salt system to correct the detected value of the actual generated power, thus, the actual generated power of the boiler system is obtained, and the unit is controlled based on the actual generated power of the boiler system, improving the control accuracy.

[0046] It should be understood that the description of technical features, technical solutions, beneficial effects or similar languages in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in this embodiment can be combined in any appropriate manner. Those skilled in the art will understand that an embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of a thermal power unit provided by an embodiment of the present application;

[0048] Figure 2 A schematic diagram of a control system provided by an embodiment of the present application;

[0049] Figure 3 A schematic diagram of a control system based on an improved DEB provided by an embodiment of the present application;

[0050] Figure 4 A flowchart of a unit control method provided by an embodiment of the present application;

[0051] Figure 5 A schematic diagram of a unit control device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] The terms "first", "second", "third", etc. in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to limit a specific order.

[0053] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0054] The cleanization of power sources is an important feature of the new power system, and the energy provided by the new power system will account for an increasing proportion in China's power supply. Due to the characteristics of new energy power generation operation, it has the disadvantages of poor stability and large impact on the power grid.

[0055] The demand for the reliability of the safe operation of the power grid is more urgent, which requires thermal power units with stable power supply to gradually transform into providers of frequency regulation, standby, and emergency capacity services. Improving the flexibility of thermal power units has become an important development direction for thermal power units.

[0056] Existing small and medium-sized units (300MW class, 600MW class) have been in operation for a long time, have low low-load efficiency, and relatively poor equipment performance. It is expected that through flexibility transformation, they will become the main units for load regulation and provide power support for the power grid; large-capacity 1000MW class coal-fired units have high efficiency and good equipment performance, and can operate at high loads to provide power support for the power grid.

[0057] Therefore, it is necessary to start from the entire chain of design, manufacturing, and operation and maintenance, and develop new high-efficiency and flexible coal-fired generating units with fast start-stop, large-range load change, and rapid load change, leading to the improvement of the flexibility of coal-fired generating units and the fast and flexible coal-fired power generation combination mode for small and medium-sized units. The structural characteristics of conventional unit thermal power units determine that their load response rate is relatively slow, about 2% MCR / min, which is difficult to meet the load change rate requirements of new units.

[0058] The embodiments of the present application provide a new type of thermal power unit, as Figure 1 shown. This figure is a schematic diagram of a thermal power unit provided by the embodiments of the present application. The thermal power unit includes: boiler 101, economizer 102, air preheater 103, regenerator 104, air heater 105, pressure reducing valve 106, regulating valve 107, No. 1 high-pressure heater 108, No. 2 high-pressure heater 109, low-pressure heater 110, deaerator 111, high-pressure cylinder 112, intermediate-pressure cylinder 113, low-pressure cylinder 114, steam-salt heat exchanger 115, electric-salt heater 116, high-temperature molten salt storage tank 117, low-temperature molten salt storage tank 118, high-temperature molten salt pump 119, low-temperature molten salt pump 120, circulating water pump 121, molten salt preheater 122, molten salt evaporator 123, molten salt superheater 124, and molten salt reheater 125.

[0059] The steam from the high-pressure cylinder 112 of the steam turbine passes through the steam-salt heat exchanger 115 to heat the molten salt from the low-temperature molten salt storage tank 118, so as to achieve heat storage. The generator heats the molten salt from the low-temperature molten salt storage tank 118 through the electric-salt heater 116 to achieve heat storage.

[0060] The circulating water from the No. 1 high-pressure heater 108 passes through the molten salt preheater 122, the molten salt evaporator 123, and the molten salt superheater 124 in sequence, then exchanges heat with the high-temperature molten salt, and obtains high-temperature and high-pressure steam that meets certain conditions, which is injected into the middle part of the high-pressure cylinder 112 of the steam turbine to do work.

[0061] Part of the steam after doing work in the high-pressure cylinder 112 of the steam turbine can be reheated by the molten salt reheater 124 and then injected into the middle part of the intermediate-pressure cylinder 113 of the steam turbine to do work, realizing the heat release of molten salt heat storage and generating steam to increase the load of the steam turbine.

[0062] The working principle of this new type of thermal power unit is as follows:

[0063] After the unit receives the load increase command, in the heat release subsystem of the molten salt heat storage link, the feed water regulating valve on the feed water branch led out after the No. 1 high-pressure heater in the main feed water pipeline is opened, and the heat release subsystem is started to dominate the load increase operation. The feed water enters the molten salt boiler, generates superheated steam after passing through the molten salt preheater, evaporator, and superheater, and then is sent to a certain stage of the high-pressure cylinder of the steam turbine to do work. At the same time, steam is extracted from the exhaust steam of the high-pressure cylinder of the steam turbine, sent to the molten salt reheater, heated, and then sent to the intermediate-pressure cylinder of the steam turbine to do work. The heat release power of the molten salt is controlled by adjusting the opening of the feed water valve on the molten salt side, assisting the coal-fired boiler to enable the unit as a whole to reach the target load value carried in the load increase command at a relatively fast rate. The temperature of the molten salt superheated steam is controlled to reach the given value by controlling the rotation speed of the molten salt pump; the temperature of the molten salt reheated steam is controlled to be the given value by the molten salt valve of the molten salt reheater; on the coal-fired side, the coordinated control system of the coal-fired unit participates in controlling the unit load, and the coordinated control system of the coal-fired unit controls the main steam pressure.

[0064] This application provides a unit load increase control system, as Figure 2 shown. This figure is a schematic diagram of a control system provided by an embodiment of this application. The control system includes a coordinated control system 201 of the coal-fired unit, a control system 202 of the molten salt heat storage link, a boiler 203, a steam turbine 204, a generator 205, and a molten salt heat storage link 206.

[0065] Among them, the coordinated control system 201 of the coal-fired unit can obtain the main steam pressure provided by the boiler 203, the pressure, enthalpy value, flow rate, etc. of the molten salt steam at the steam turbine gas collecting point provided by the molten salt thermal energy storage link 206, and obtain the generator power detection value provided by the generator 205. Then, based on the obtained data, it sends instructions such as coal, feed water, and air supply to the boiler, and sends a main steam valve opening instruction to the steam turbine 204.

[0066] The control system 202 of the molten salt thermal energy storage link can obtain the detected value of the absorbed power of the molten salt provided by the molten salt thermal energy storage link 206 and the detected value of the generator power provided by the generator 205. Then, based on the obtained data, it adjusts the opening of the feed water valve on the molten salt side and the rotation speed of the molten salt pump. The molten salt thermal energy storage link 206 is used to supply medium-pressure cylinder inlet air and high-pressure cylinder inlet air to the steam turbine 204.

[0067] To make the technical solution of this application clearer and easier to understand, the technical solution of this application will be introduced below with reference to the accompanying drawings.

[0068] As Figure 3 shown, this figure is a schematic diagram of a control system based on improved DEB provided by an embodiment of this application. Among them, p1: the pressure in front of the coal-fired unit (governing stage pressure); pt: the main steam pressure of the boiler of the coal-fired unit; ps: the set value of the main steam pressure of the boiler of the coal-fired unit; PID4: the PID4 control module in the main steam pressure control loop; PID5: the main controller of the cascade control in the power control loop; PID6: the secondary controller of the cascade control in the power control loop; Pm: the calculated value of the actual generated power on the coal side; M: the equivalent fuel valve opening control quantity (such as the rotation speed of the coal feeder, etc.); μ: the opening of the main steam valve.

[0069] In traditional DEB control, the power feedback value of the main controller of the cascade control in the power control loop is the detected value of the actual generated power. In this application, the power feedback value of the main controller of the cascade control in the power control loop is transformed and changed to use the calculated value of the actual generated power on the coal side (that is, the detected value of the actual generated power is corrected by using the equivalent electric power of the molten salt system to obtain the corrected value of the actual generated power), and the detected value of the actual generated power is not used. The purpose is to cooperate with the molten salt system for unit load control during the load increase process.

[0070] It should be noted that only the modified part of the DEB control strategy is described here, that is, the power feedback value of the main controller of the cascade control in the power control loop uses the calculated value Pm of the actual generated power on the coal side. The calculation process: calculate the corresponding electric power Psa_e from the original output power Psa of the molten salt system. After obtaining Psa_e, Pm = P - Psa can be calculated, where P is the detected value of the actual generated power, such as the total electric power at the outlet of the generator measured (the measured electric power P at the outlet of the generator is the result of the combined action of coal and molten salt).

[0071] The following introduces a unit control method provided by an embodiment of the present application in conjunction with the accompanying drawings. As Figure 4 shown, this figure is a flowchart of a unit control method provided by an embodiment of the present application. The method includes:

[0072] S401. Obtain the superheated steam power and reheated steam power of the molten salt system.

[0073] The steam on the molten salt system side includes superheated steam and reheated steam. The power converted to superheated steam is the superheated steam power, and the power converted to reheated steam is the reheated steam power. The superheated steam power refers to the original power transferred to the superheated steam on the molten salt side through the molten salt heat exchanger. The reheated steam power refers to the original power transferred to the reheated steam on the molten salt side through the molten salt heat exchanger.

[0074] In some embodiments, the first energy of the feed water before passing through the molten salt preheater, molten salt evaporator, and molten salt superheater can be obtained, and the second energy of the feed water after passing through the molten salt preheater, molten salt evaporator, and molten salt superheater to generate molten salt steam can be obtained. Then, based on the difference between the second energy and the first energy, the superheated steam power of the molten salt system can be obtained. Specifically, the superheated steam power of the molten salt system can be calculated by the following formula:

[0075] P sh = E sh2 - E sh1

[0076] where P sh is the superheated steam power of the molten salt system, E sh1 is the first energy, which can be calculated based on the temperature, pressure, and flow rate of the feed water, and E sh2 is the second energy, which can be calculated based on the temperature, pressure, and flow rate of the molten salt steam.

[0077] In some embodiments, the third energy of the extraction steam from the high-pressure cylinder before passing through the molten salt reheater can be obtained, and the fourth energy of the extraction steam from the high-pressure cylinder after passing through the molten salt reheater can be obtained; based on the difference between the fourth energy and the third energy, the reheated steam power of the molten salt system can be obtained. Specifically, the reheated steam power of the molten salt system can be calculated by the following formula:

[0078] P rh = E rh2 - E rh1

[0079] where P rh is the reheated steam power of the molten salt system, E rh1is the third energy, which can be calculated based on the temperature, pressure, and flow rate of the molten salt steam before passing through the molten salt reheater, E rh2 is the fourth energy, which can be calculated based on the temperature, pressure, and flow rate of the molten salt steam after passing through the molten salt reheater.

[0080] S402. Determine the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power.

[0081] In some examples, the sum of the superheated steam power and the reheated steam power can be determined as the equivalent electric power of the molten salt system.

[0082] In other examples, it is also possible to first determine the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power, and then use the sum of the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power as the equivalent electric power of the molten salt system.

[0083] For example, the equivalent electric power of the superheated steam power can be determined according to the superheated steam power, the preset efficiency coefficient, and the loss coefficients corresponding to the regenerative extraction points of the high-pressure cylinder; the equivalent electric power of the reheated steam power can be determined according to the reheated steam power, the preset efficiency coefficient, and the loss coefficients corresponding to the regenerative extraction points of the intermediate-pressure cylinder.

[0084] Among them, both the high-pressure cylinder and the intermediate-pressure cylinder may include at least one regenerative extraction point, or may include multiple regenerative extraction points. The following will be introduced in different cases.

[0085] The first case: Both the high-pressure cylinder and the intermediate-pressure cylinder include one regenerative extraction point.

[0086] The high-pressure cylinder includes the first regenerative extraction point, and the loss coefficient corresponding to the first regenerative extraction point of the high-pressure cylinder is determined by the following method:

[0087] According to the power of the superheated molten salt steam, the regenerative extraction power at the first regenerative extraction point, and the steam power entering the high-pressure cylinder, determine the loss coefficient corresponding to the first regenerative extraction point. Specifically, it can be determined by the following formula:

[0088]

[0089] Among them, K a1 is the loss coefficient corresponding to the first regenerative extraction point, P a1 is the regenerative extraction power at the first regenerative extraction point, P sh is the power of the molten salt superheated steam, P m2 is the steam power on the coal side entering the high-pressure cylinder. For example, it can be the equivalent power of the main steam input power on the coal-fired boiler side at the steam collecting point.

[0090] In some embodiments, the steam power on the coal-fired side entering the high-pressure cylinder can be determined by the following formula:

[0091] P m2 = P m -△h*η*G

[0092] In the formula, △h is the total enthalpy drop from a certain starting stage to the ending stage of the steam turbine, η is the total efficiency of the steam turbine, and G is the steam flow rate; Pm is the main steam input power on the coal-fired boiler side, which can be calculated based on the steam temperature, pressure, and flow rate.

[0093] Among them, the steam power entering the high-pressure cylinder is determined by the following method:

[0094] Obtain the steam input power of the boiler system; determine the steam power entering the high-pressure cylinder according to the steam input power of the boiler system, the enthalpy drop of the steam turbine, and the efficiency of the steam turbine.

[0095] The intermediate-pressure cylinder includes a second regenerative extraction point, and the loss coefficient corresponding to the second regenerative extraction point of the intermediate-pressure cylinder is determined by the following method:

[0096] Determine the loss coefficient corresponding to the second regenerative extraction point according to the reheated steam power, the regenerative extraction power at the second regenerative extraction point, and the steam power entering the intermediate-pressure cylinder. Specifically, it can be determined by the following formula:

[0097]

[0098] Among them, K a1_rh is the loss coefficient corresponding to the second regenerative extraction point, P a2 is the regenerative extraction power at the second regenerative extraction point, P rh is the reheated steam power, P m3 is the steam power entering the intermediate-pressure cylinder.

[0099] In this first case, the equivalent electric power of the superheated steam power of the high-pressure cylinder can be determined according to the molten salt superheated steam power, the preset efficiency coefficient, and the loss coefficient corresponding to the first regenerative extraction point of the high-pressure cylinder. Specifically, it can be calculated by the following formula:

[0100] P sh_E_HP = P sh (1 - K a1 )η T η G

[0101] Among them, P sh_E_HP is the equivalent electric power of the superheated steam power of the high-pressure cylinder, P sh is the molten salt superheated steam power, K a1 is the loss coefficient corresponding to the first regenerative extraction point, ηT and η G is a preset efficiency coefficient, where η T is the steam turbine efficiency coefficient, and η G is the generator efficiency coefficient.

[0102] Similarly, taking the steam inlet points of the intermediate and low-pressure cylinders as the steam injection points, the electric power P sh_E_IP and P sh_E_LP corresponding to the superheated steam in the intermediate and low-pressure cylinders can be calculated by the above process.

[0103] Similarly, based on the reheated steam power, the preset efficiency coefficient, and the loss coefficient corresponding to the second regenerative extraction point of the intermediate-pressure cylinder, the equivalent electric power of the reheated steam power in the intermediate-pressure cylinder can be determined. Specifically, it can be calculated by the following formula:

[0104] P rh_E_IP = P rh (1 - K a1_rh )η T η G

[0105] where P rh_E_IP is the equivalent electric power of the reheated steam power in the intermediate-pressure cylinder, P rh is the reheated steam power, K a1_rh is the loss coefficient corresponding to the second regenerative extraction point, η T , η G is the preset efficiency coefficient, where η T is the steam turbine efficiency coefficient, and η G is the generator efficiency coefficient.

[0106] Similarly, taking the steam inlet of the low-pressure cylinder as the steam injection point, the electric power P rh_E_LP corresponding to the reheated steam in the low-pressure cylinder can be obtained by the above process.

[0107] Second type: Both the high-pressure cylinder and the intermediate-pressure cylinder include multiple regenerative extraction points.

[0108] For the convenience of understanding below, taking the case where both the high-pressure cylinder and the intermediate-pressure cylinder include two regenerative extraction points as an example, an introduction is given.

[0109] The high-pressure cylinder includes the first regenerative extraction point and the third regenerative extraction point. The loss coefficient corresponding to the third regenerative extraction point of the high-pressure cylinder is the same as or similar to that in the above embodiment, and will not be elaborated here.

[0110] The intermediate-pressure cylinder includes the second regenerative extraction point and the fourth regenerative extraction point. The loss coefficient corresponding to the fourth regenerative extraction point of the intermediate-pressure cylinder is the same as or similar to that in the above embodiment, and will not be elaborated here.

[0111] In this second case, the equivalent electric power of the superheated steam power can be determined based on the superheated steam power, the preset efficiency coefficient, the loss coefficient corresponding to the first regenerative extraction point of the high-pressure cylinder, and the loss coefficient corresponding to the third regenerative extraction point. Considering that the steam turbine efficiency is very high, when the number of extraction stages ≤ 3, the following formula can be used for simple calculation:

[0112] P sh_E_HP = P sh (1 - K a1 - K a2 )η T η G

[0113] Where, P sh_E_HP is the equivalent electric power of the superheated steam power of the high-pressure cylinder, P sh is the superheated steam power, K a1 is the loss coefficient corresponding to the first regenerative extraction point, K a3 is the loss coefficient corresponding to the third regenerative extraction point, η T , η G are the preset efficiency coefficients, where, η T is the steam turbine efficiency coefficient, η G is the generator efficiency coefficient. Similarly, taking the steam inlet points of the intermediate and low-pressure cylinders as the steam injection points, the electric powers P sh_E_IP and P sh_E_LP corresponding to the superheated steam in the intermediate and low-pressure cylinders can be calculated by the above process.

[0114] Similarly, the equivalent electric power of the molten salt reheated steam power can be determined based on the molten salt reheated steam power, the preset efficiency coefficient, the loss coefficient corresponding to the second regenerative extraction point of the intermediate-pressure cylinder, and the loss coefficient corresponding to the fourth regenerative extraction point, and the following formula can be used for calculation:

[0115] P rh_E_IP = P rh (1 - K a1_rh - K a2_rh )η T η G

[0116] Where, P rh_E_IP is the equivalent electric power of the molten salt reheated steam power, P rh is the molten salt reheated steam power, K a1_rh is the loss coefficient corresponding to the second regenerative extraction point, K a2_rh is the loss coefficient corresponding to the second regenerative extraction point, η T , η G are the preset efficiency coefficients, where, η T is the steam turbine efficiency coefficient, η Gis the efficiency coefficient of the generator. Similarly, taking the low-pressure cylinder steam inlet as the steam injection point, the corresponding electric power P of the molten salt reheated steam in the low-pressure cylinder can be obtained by the above process. rh_E_LP .

[0117] Then, based on the equivalent electric power of the molten salt superheated steam and the equivalent electric power of the molten salt reheated steam, determine the equivalent electric power of the molten salt system, which can be specifically calculated by the following formula:

[0118] P sa_E = P sh_E_HP + P sh_E_IP + P sh_E_LP + P rh_E_IP + P rh_E_LP

[0119] Among them, P sa_E is the equivalent electric power of the molten salt system, P sh_E_HP is the equivalent electric power of the molten salt superheated steam in the high-pressure cylinder, P sh_E_IP is the equivalent electric power of the molten salt superheated steam in the intermediate-pressure cylinder, P sh_E_LP is the equivalent electric power of the molten salt superheated steam in the low-pressure cylinder, P rh_E_IP is the equivalent electric power of the molten salt reheated steam in the intermediate-pressure cylinder, P rh_E_LP is the equivalent electric power of the molten salt reheated steam in the low-pressure cylinder.

[0120] S403. Use the equivalent electric power of the molten salt system to correct the detected value of the actual generated electric power to obtain the corrected value of the actual generated electric power.

[0121] After obtaining the equivalent electric power of the molten salt system, the detected value of the actual generated electric power can be corrected, and then the corrected value of the actual generated electric power can be obtained.

[0122] In some examples, subtract the equivalent electric power of the molten salt system from the detected value of the actual generated electric power.

[0123] S404. Control the unit according to the corrected value of the actual generated electric power.

[0124] After obtaining the corrected value of the actual generated electric power, use this corrected value to control the unit.

[0125] Based on the above description, an embodiment of the present application provides a unit control method. The unit includes a boiler system and a molten salt system. The method includes obtaining the superheated steam power and the reheated steam power of the molten salt system, determining the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power, using the equivalent electric power of the molten salt system to correct the detected value of the actual generated power to obtain a corrected value of the actual generated power, and controlling the unit according to the corrected value of the actual generated power. In this method, by calculating the equivalent electric power of the molten salt system and then using the equivalent electric power of the molten salt system to correct the detected value of the actual generated power, thus, the actual generated power of the boiler system is obtained, and the unit is controlled based on the actual generated power of the boiler system, improving the control accuracy.

[0126] An embodiment of the present application also provides a unit control device, as Figure 5 shown. This figure is a schematic diagram of a unit control device provided by an embodiment of the present application. The unit control device includes:

[0127] An acquisition module 501, configured to obtain the superheated steam power and the reheated steam power of the molten salt system;

[0128] A determination module 502, configured to determine the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power;

[0129] A correction module 503, configured to use the equivalent electric power of the molten salt system to correct the detected value of the actual generated power to obtain a corrected value of the actual generated power;

[0130] A control module 504, configured to control the unit according to the corrected value of the actual generated power.

[0131] In some possible implementation manners, the acquisition module 501 is specifically configured to obtain the first energy of the feed water before passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater, and the second energy of the feed water after passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater to generate molten salt steam; and obtain the superheated steam power of the molten salt system according to the difference between the second energy and the first energy.

[0132] In some possible implementation manners, the acquisition module 501 is specifically configured to obtain the third energy of the extraction steam of the high-pressure cylinder before passing through the molten salt reheater, and the fourth energy of the extraction steam of the high-pressure cylinder after passing through the molten salt reheater; and obtain the reheated steam power of the molten salt system according to the difference between the fourth energy and the third energy.

[0133] In some possible implementation manners, the determining module 502 is specifically configured to determine the equivalent electric power of the superheated steam power according to the superheated steam power, a preset efficiency coefficient, and loss coefficients corresponding to respective regenerative extraction steam locations of the high-pressure cylinder; determine the equivalent electric power of the reheated steam power according to the reheated steam power, the preset efficiency coefficient, and loss coefficients corresponding to respective regenerative extraction steam locations of the intermediate-pressure cylinder; and determine the equivalent electric power of the molten salt system according to the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power.

[0134] In some possible implementation manners, the high-pressure cylinder includes a first regenerative extraction steam location, and the determining module 502 is specifically configured to determine the loss coefficient corresponding to the first regenerative extraction steam location according to the superheated steam power, the regenerative extraction steam power at the first regenerative extraction steam location, and the steam power entering the high-pressure cylinder.

[0135] The intermediate-pressure cylinder includes a second regenerative extraction steam location, and the determining module 502 is specifically configured to determine the loss coefficient corresponding to the second regenerative extraction steam location according to the reheated steam power, the regenerative extraction steam power at the second regenerative extraction steam location, and the steam power entering the intermediate-pressure cylinder.

[0136] In some possible implementation manners, the determining module 502 is specifically configured to obtain the steam input power of the boiler system; and determine the steam power entering the high-pressure cylinder according to the steam input power of the boiler system, the enthalpy drop of the steam turbine, and the efficiency of the steam turbine.

[0137] In some possible implementation manners, the correcting module 503 is specifically configured to subtract the equivalent electric power of the molten salt system from the detected value of the actual generated electric power.

[0138] Based on the above description, an embodiment of the present application provides a unit control device. The unit includes a boiler system and a molten salt system. The device obtains the superheated steam power and the reheated steam power of the molten salt system, determines the equivalent electric power of the molten salt system according to the superheated steam power and the reheated steam power, corrects the detected value of the actual generated electric power by using the equivalent electric power of the molten salt system to obtain a corrected value of the actual generated electric power, and controls the unit according to the corrected value of the actual generated electric power. Based on this device, by calculating the equivalent electric power of the molten salt system and then using the equivalent electric power of the molten salt system to correct the detected value of the actual generated electric power, thus, the actual generated electric power of the boiler system is obtained, and the unit is controlled based on the actual generated electric power of the boiler system, improving the control accuracy.

[0139] This application provides a control device, including: a memory storing a computer program thereon; a processor configured to execute the computer program in the memory to implement the steps of any one of the methods in the method embodiments.

[0140] This application provides a computer-readable storage medium storing a computer program thereon, and when the program is executed by a processor, it implements the steps of any one of the methods in the method embodiments.

[0141] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0142] In the several embodiments provided in this embodiment, it should be understood that the disclosed processing device and method can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0143] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0144] In addition, in each embodiment of this embodiment, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0145] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in each embodiment. The foregoing storage medium includes: various media that can store program codes, such as flash memory, mobile hard disk, read-only memory, random access memory, magnetic disk, or optical disc.

[0146] As described above, the foregoing are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A unit control method, characterized in that: The unit includes a boiler system and a molten salt system; the method includes: Obtaining superheated steam power and reheated steam power of the molten salt system; Determining the equivalent electrical power of the molten salt system according to the superheated steam power and the reheated steam power; The detection value of the actual power generation is corrected by using the equivalent electric power of the molten salt system to obtain a corrected value of the actual power generation; Controlling the unit according to the corrected value of the actual generated power; The determining the equivalent electrical power of the molten salt system according to the superheated steam power and the reheated steam power comprises: Determine the equivalent electrical power of the superheated steam power according to the superheated steam power, the preset efficiency coefficient and the loss coefficients corresponding to each heat recovery extraction point of the high-pressure cylinder; Determine the equivalent electric power of the reheat steam power according to the reheat steam power, the preset efficiency coefficient and the loss coefficients corresponding to each heat recovery extraction point of the intermediate pressure cylinder; The equivalent electrical power of the molten salt system is determined according to the equivalent electrical power of the superheated steam power and the equivalent electrical power of the reheated steam power.

2. The method according to claim 1, characterized in that: The obtaining of the superheated steam power of the molten salt system comprises: Acquire a first energy of the feed water before passing through a molten salt preheater, a molten salt evaporator, and a molten salt superheater, and a second energy of the feed water after passing through the molten salt preheater, the molten salt evaporator, and the molten salt superheater to generate molten salt steam; The superheated steam power of the molten salt system is obtained according to the difference between the second energy and the first energy.

3. The method according to claim 1, characterized in that The reheat steam power is obtained as follows: Acquire a third energy of the extraction steam of the high-pressure cylinder before passing through the molten salt reheater, and a fourth energy of the extraction steam of the high-pressure cylinder after passing through the molten salt reheater; The reheat steam power of the molten salt system is obtained according to the difference between the fourth energy and the third energy.

4. The method according to claim 1, characterized in that The high-pressure cylinder includes a first heat recovery steam extraction location, and the loss coefficient corresponding to the first heat recovery steam extraction location of the high-pressure cylinder is determined by the following method: Determine a loss coefficient corresponding to the first heat extraction point according to the superheated steam power, the heat extraction power at the first heat extraction point, and the steam power entering the high-pressure cylinder; The intermediate pressure cylinder includes a second heat recovery steam extraction location, and the loss coefficient corresponding to the second heat recovery steam extraction location of the intermediate pressure cylinder is determined by the following method: The loss coefficient corresponding to the second heat extraction point is determined according to the reheat steam power, the heat extraction power at the second heat extraction point, and the steam power entering the intermediate pressure cylinder.

5. The method according to claim 4, characterized in that The steam power entering the high-pressure cylinder is determined by the following method: Obtaining the steam input power of the boiler system; The steam power entering the high-pressure cylinder is determined according to the steam input power of the boiler system, the enthalpy drop of the steam turbine and the efficiency of the steam turbine.

6. The method according to claim 4, characterized in that The method of correcting the detected value of the actual power generation by using the equivalent electric power of the molten salt system comprises: The equivalent electric power of the molten salt system is subtracted from the detected value of the actual generated power.

7. A unit control device, characterized in that: The unit includes a boiler system and a molten salt system, and the unit control device includes: An acquisition module, used for acquiring the superheated steam power and the reheated steam power of the molten salt system; A determination module, for determining the equivalent electric power of the superheated steam power according to the superheated steam power, a preset efficiency coefficient and the loss coefficients corresponding to each heat recovery extraction point of the high-pressure cylinder; determining the equivalent electric power of the reheated steam power according to the reheated steam power, the preset efficiency coefficient and the loss coefficients corresponding to each heat recovery extraction point of the intermediate-pressure cylinder; determining the equivalent electric power of the molten salt system according to the equivalent electric power of the superheated steam power and the equivalent electric power of the reheated steam power; A correction module, used to correct the detected value of the actual power generation by using the equivalent electric power of the molten salt system to obtain a corrected value of the actual power generation; A control module is used to control the unit according to the correction value of the actual generated power.

8. A control device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

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