Control method and device of gas-steam combined cycle unit

Abstract

The invention provides a control method and device for a gas-steam combined cycle unit, and relates to the technical field of power generation. The method is applied to a gas-steam combined cycle unit, the gas-steam combined cycle unit comprises a gas turbine, a waste heat boiler and a steam turbine, a first flue branch between the gas turbine and the waste heat boiler is provided with a first baffle, and a second flue branch between the gas turbine and the waste heat boiler is sequentially provided with a second baffle, an energy storage device and a third baffle. The energy storage device is made of a heat conduction material. The method comprises the steps that real-time operation data of the gas-steam combined cycle unit are obtained to determine the real-time operation state of the gas-steam combined cycle unit; in response to switching of the real-time operation state of the gas-steam combined cycle unit, a switching control strategy corresponding to state switching is determined, and the switching control strategy comprises opening and closing control over at least one of a first baffle, a second baffle and a third baffle; and executing the switching control strategy on the gas-steam combined cycle unit.

Description

Technical Field

[0001] The present application relates to the technical field of gas-steam combined cycle unit power generation, and in particular to a control method and device for a gas-steam combined cycle unit. Background Art

[0002] Combined Cycle Gas Turbine (CCGT) is a highly efficient power generation system that combines a gas turbine and a steam turbine, using the exhaust gas generated by the gas turbine to heat the steam, which in turn drives the steam turbine to generate electricity.

[0003] However, the time and frequency required for cold start of CCGT units have a significant impact on their operating efficiency and economy. Cold start usually involves the time required for the unit to reach stable operation from a complete shutdown state. This process not only increases the wear of the unit, but may also cause frequency fluctuations in the system. In order to optimize the operating performance of the unit, reducing the number of cold starts has become an important technical requirement. Summary of the invention

[0004] The present disclosure provides a control method and device for a gas-steam combined cycle unit, so as to at least solve the problem of how to reduce the number of cold starts in the related art.

[0005] The first aspect of the present application provides a control method for a gas-steam combined cycle unit, which is applied to the gas-steam combined cycle unit, wherein the gas-steam combined cycle unit includes a gas engine, a waste heat boiler and a steam turbine, a first flue branch between the gas engine and the waste heat boiler is provided with a first baffle, and a second flue branch between the gas engine and the waste heat boiler is provided with a second baffle, an energy storage device and a third baffle in sequence, and the energy storage device is made of heat conductive material, and the method includes: acquiring real-time operation data of the gas-steam combined cycle unit; determining the real-time operation state of the gas-steam combined cycle unit according to the real-time operation data, wherein the real-time operation state includes an initial startup state, a normal operation state, a speed reduction shutdown state, a complete shutdown state and a restart state; in response to a switch in the real-time operation state of the gas-steam combined cycle unit, determining a switching control strategy corresponding to the state switch, wherein the switching control strategy includes opening and closing control of at least one of the first baffle, the second baffle and the third baffle; and executing the switching control strategy on the gas-steam combined cycle unit.

[0006] According to one embodiment of the present application, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switching control strategy corresponding to the state switch is determined, including: in response to the gas-steam combined cycle unit switching from a complete shutdown state to an initial startup state, determining that the switching control strategy corresponding to the state switch is a first control strategy; wherein the first control strategy is: closing the first damper, and opening the second damper and the third damper.

[0007] According to one embodiment of the present application, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switching control strategy corresponding to the state switch is determined, including: in response to the gas-steam combined cycle unit switching from an initial startup state to a normal operating state, determining that the switching control strategy corresponding to the state switch is a second control strategy; wherein the second control strategy is: to open the first damper, close the third damper, and maintain the second damper in an open state.

[0008] According to one embodiment of the present application, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switching control strategy corresponding to the state switch is determined, including: in response to the gas-steam combined cycle unit switching from a normal operating state to a speed reduction shutdown state, determining that the switching control strategy corresponding to the state switch is a third control strategy; wherein the third control strategy is: closing the first damper, opening the third damper, and maintaining the second damper in an open state.

[0009] According to one embodiment of the present application, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switching control strategy corresponding to the state switch is determined, including: in response to the gas-steam combined cycle unit switching from a speed reduction shutdown state to a complete shutdown state, determining that the switching control strategy corresponding to the state switch is a fourth control strategy; wherein the fourth control strategy is: closing the second damper and the third damper, and maintaining the first damper in a closed state.

[0010] According to one embodiment of the present application, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switching control strategy corresponding to the state switch is determined, including: in response to the gas-steam combined cycle unit switching from a completely shut down state to a restart state, determining that the switching control strategy corresponding to the state switch is a fifth control strategy; wherein the fifth control strategy is: closing the first damper, opening the second damper and the third damper, and blowing cold air from the side of the engine to the second flue branch, and igniting the engine after the blowing of cold air is completed.

[0011] According to one embodiment of the present application, the design process of the energy storage device includes: establishing a unit model corresponding to the gas-steam combined cycle unit; obtaining the exhaust parameters of the gas turbine, and determining the energy storage related parameters of the energy storage device according to the exhaust parameters, the related parameters including the material parameters and structural parameters of the energy storage device, and performing transient flow field and temperature field simulation on the energy storage device to evaluate its thermodynamic behavior and fluid dynamic characteristics under different operating conditions; establishing a mathematical model corresponding to the energy storage device, integrating the mathematical model into the unit model, and performing a unit cold start and stop simulation test on the integrated unit model based on a preset gas turbine load change rate; analyzing the relevant components of the waste heat boiler according to the simulation experiment results to obtain analysis results; in response to the analysis results meeting the preset requirements, using the energy storage related parameters as the final parameters of the energy storage device; in response to the analysis results not meeting the preset requirements, adjusting the energy storage related parameters of the energy storage device, and performing transient flow field and temperature field simulation and subsequent steps on the energy storage device based on the adjusted energy storage related parameters until the energy storage related parameters that meet the preset requirements are obtained.

[0012] According to one embodiment of the present application, the energy storage device is a honeycomb structure.

[0013] The second aspect of the present application proposes a control device for a gas-steam combined cycle unit, including: a data acquisition module, used to acquire real-time operating data of the gas-steam combined cycle unit; a state determination module, used to determine the real-time operating state of the gas-steam combined cycle unit according to the real-time operating data, wherein the real-time operating state includes an initial startup state, a normal operating state, a speed reduction shutdown state, a complete shutdown state and a restart state; a strategy determination module, used to determine a switching control strategy corresponding to the state switching in response to a switch in the real-time operating state of the gas-steam combined cycle unit, wherein the switching control strategy includes opening and closing control of at least one of the first baffle, the second baffle and the third baffle; a strategy execution module, used to execute the switching control strategy for the gas-steam combined cycle unit.

[0014] According to one embodiment of the present application, the strategy determination module is also used to: in response to the gas-steam combined cycle unit switching from a complete shutdown state to an initial startup state, determine that the switching control strategy corresponding to the state switching is a first control strategy; wherein the first control strategy is: closing the first damper, and opening the second damper and the third damper.

[0015] According to one embodiment of the present application, the strategy determination module is also used to: in response to the gas-steam combined cycle unit switching from an initial startup state to a normal operating state, determine that the switching control strategy corresponding to the state switching is a second control strategy; wherein the second control strategy is: to open the first damper, close the third damper, and maintain the second damper in an open state.

[0016] According to one embodiment of the present application, the strategy determination module is also used to: in response to the gas-steam combined cycle unit switching from a normal operating state to a speed reduction shutdown state, determine that the switching control strategy corresponding to the state switching is a third control strategy; wherein the third control strategy is: close the first damper, open the third damper, and maintain the second damper in an open state.

[0017] According to one embodiment of the present application, the strategy determination module is also used to: in response to the gas-steam combined cycle unit switching from a speed reduction shutdown state to a complete shutdown state, determine that the switching control strategy corresponding to the state switching is a fourth control strategy; wherein the fourth control strategy is: closing the second damper and the third damper, and maintaining the first damper in a closed state.

[0018] According to one embodiment of the present application, the strategy determination module is also used to: in response to the gas-steam combined cycle unit switching from a completely shut down state to a restart state, determine that the switching control strategy corresponding to the state switching is the fifth control strategy; wherein the fifth control strategy is: close the first damper, open the second damper and the third damper, and blow cold air from the side of the engine to the second flue branch, and ignite the engine after the blowing of cold air is completed.

[0019] According to one embodiment of the present application, a design process of an energy storage device involved in a control device of a gas-steam combined cycle unit includes: establishing a unit model corresponding to the gas-steam combined cycle unit; obtaining exhaust parameters of the gas turbine, and determining energy storage-related parameters of the energy storage device based on the exhaust parameters, the related parameters including material parameters and structural parameters of the energy storage device, and performing transient flow field and temperature field simulations on the energy storage device to evaluate its thermodynamic behavior and fluid dynamic characteristics under different operating conditions; establishing a mathematical model corresponding to the energy storage device, integrating the mathematical model into the unit model, and performing a unit cold start and stop simulation test on the integrated unit model based on a preset gas turbine load change rate; analyzing relevant components of the waste heat boiler based on the simulation experiment results to obtain analysis results; in response to the analysis results meeting the preset requirements, using the energy storage-related parameters as the final parameters of the energy storage device; in response to the analysis results not meeting the preset requirements, adjusting the energy storage-related parameters of the energy storage device, and performing transient flow field and temperature field simulations and subsequent steps on the energy storage device based on the adjusted energy storage-related parameters until energy storage-related parameters that meet the preset requirements are obtained.

[0020] According to one embodiment of the present application, the energy storage device involved in the control device of the gas-steam combined cycle unit is a honeycomb structure.

[0021] The third aspect embodiment of the present application proposes a gas-steam combined cycle unit, which includes a gas engine, a waste heat boiler and a steam turbine, and is characterized in that: the first flue branch between the gas engine and the waste heat boiler is provided with a first baffle; the second flue branch between the gas engine and the waste heat boiler is provided with a second baffle, an energy storage device and a third baffle in sequence; the energy storage device adopts a heat conductive material.

[0022] The fourth aspect embodiment of the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the gas-steam combined cycle unit as described in the first aspect embodiment of the present application.

[0023] The fifth aspect embodiment of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the control method of the gas-steam combined cycle unit as described in the first aspect embodiment of the present application.

[0024] The sixth aspect embodiment of the present application proposes a computer program product, including a computer program, which, when executed by a processor, implements the control method of the gas-steam combined cycle unit as described in the first aspect embodiment of the present application.

[0025] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects: during the start-up and shutdown process of the unit, the present application can significantly reduce the stress peak of important components of the waste heat boiler (such as superheater, steam drum, etc.) by delaying the temperature change rate of the flue gas entering the waste heat boiler, and can effectively reduce the thermal stress and fatigue of the components, increase the service life of the equipment, and reduce maintenance and replacement costs; due to the optimized control of the flue gas temperature change, the number of starts of the unit in the cold state is increased, which means that the unit can be started more frequently under low load or discontinuous operation without causing damage to the equipment, thereby improving the scheduling flexibility and operating efficiency of the unit; by optimizing the opening and closing control strategy of the damper, the start-up and shutdown time of the unit can be effectively shortened.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic diagram of an exemplary implementation of a control method for a gas-steam combined cycle unit shown in an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of a gas-steam combined cycle unit shown in one embodiment of the present application.

[0030] Figure 3 It is a schematic structural diagram of an energy storage device shown in one embodiment of the present application.

[0031] Figure 4 It is a flowchart of a design process of an energy storage device shown in an embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of a control device for a gas-steam combined cycle unit shown in one embodiment of the present application.

[0033] Figure 6 It is a schematic diagram of an electronic device shown in one embodiment of the present application.

[0034] exist Figure 2 In the figure, the corresponding relationship between the components and the numbers is: gas turbine-1, waste heat boiler-2, first baffle-3, second baffle-4, third baffle-5, energy storage device-6. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] The following is an introduction to some professional terms involved in this patent:

[0037] 1. Cold start: When the gas-steam combined cycle unit stops running for a period of time, its components may cool to the ambient temperature. This start is called a cold start. Compared with a hot start, a cold start takes a longer time to heat the unit, restore it to the operating temperature, and reach a stable operating state.

[0038] 2. Allowable number of times: The design and maintenance of the gas-steam combined cycle unit stipulates the number of cold starts it can withstand, which is related to the mechanical durability and life of the gas-steam combined cycle unit. If the number of cold starts is too many, it may accelerate the wear of the unit and shorten its service life, so this factor needs to be considered during design and operation. For example, suppose the manufacturer of a CCGT unit stipulates that the unit can withstand 100 cold starts. This means that during the entire service life of the unit, it can perform a maximum of 100 operations of restarting after complete cooling. If the unit is frequently started from a complete stop state, exceeding this number limit, it may cause increased wear of the equipment or even failure.

[0039] Figure 1 is a schematic diagram of an exemplary implementation of a control method for a gas-steam combined cycle unit shown in the present application, such as Figure 1 As shown, the control method of the gas-steam combined cycle unit comprises the following steps:

[0040] S101, obtaining real-time operation data of the gas-steam combined cycle unit.

[0041] For ease of understanding, in this application, the structure of the gas-steam combined cycle unit is first introduced. Figure 2 is a schematic diagram of a gas-steam combined cycle unit shown in the present application, such as Figure 2 As shown, the gas-steam combined cycle unit includes a gas engine, a waste heat boiler and a steam turbine. The first flue branch between the gas engine and the waste heat boiler is provided with a first baffle, and the second flue branch between the gas engine and the waste heat boiler is provided with a second baffle, an energy storage device and a third baffle in sequence. The energy storage device uses high thermal conductivity and strong energy storage materials. At the same time, the energy storage device should be well insulated to avoid heat loss.

[0042] exist Figure 2 In the figure, the corresponding relationship between the components and the numbers is: gas turbine-1, waste heat boiler-2, first baffle-3, second baffle-4, third baffle-5, energy storage device-6.

[0043] Figure 3 It is a structural schematic diagram of an energy storage device shown in this application, such as Figure 3 As shown, preferably, the energy storage device is a honeycomb structure to increase the energy storage area. In addition, the energy storage device can also be designed as a porous medium structure, a layered structure, etc.

[0044] In this application, real-time operating data of the gas-steam combined cycle unit is obtained in real time, such as fuel flow, exhaust temperature, speed of the gas engine and steam turbine, unit load change and other parameters.

[0045] S102, determining the real-time operating state of the gas-steam combined cycle unit according to the real-time operating data, wherein the real-time operating state includes an initial startup state, a normal operating state, a speed reduction shutdown state, a complete shutdown state and a restart state.

[0046] The initial startup state refers to the state when the gas-steam combined cycle unit is first started and is in the startup process. At this time, both the gas engine and the steam turbine have not reached their rated operating parameters.

[0047] Among them, the normal operating state refers to the gas-steam combined cycle unit operating under the designed conditions, with the gas engine and steam turbine both in stable working conditions.

[0048] Among them, the speed reduction shutdown state refers to the state in which the gas-steam combined cycle unit gradually reduces its output power from the normal operating state and finally stops running.

[0049] Among them, the complete shutdown state means that the gas-steam combined cycle unit is completely stopped and all operating equipment is in the shut down state.

[0050] The restart state refers to the process of restarting the gas-steam combined cycle unit from a complete shutdown state.

[0051] S103, in response to a switch in the real-time operating state of the gas-steam combined cycle unit, determining a switching control strategy corresponding to the state switch, wherein the switching control strategy includes opening and closing control of at least one of the first baffle, the second baffle and the third baffle.

[0052] When the real-time operating state of the gas-steam combined cycle unit switches (such as from normal operation to speed reduction shutdown), it is necessary to monitor and capture these state changes in real time. Once the state change is detected, the corresponding switching control strategy is automatically determined according to the preset logic and operating conditions.

[0053] Specifically, in S103, if the gas-steam combined cycle unit switches from a completely shut down state to an initial start-up state, that is, when the gas-steam combined cycle unit is started for the first time, it is determined that the switching control strategy corresponding to the state switching is the first control strategy; wherein, the first control strategy is: closing the first baffle, and opening the second baffle and the third baffle, so that the exhaust gas of the gas turbine absorbs heat and cools down in the energy storage device before entering the waste heat boiler, which can effectively avoid the rapid increase in the temperature of the heating surface of the waste heat boiler and reduce the stress peak of important components.

[0054] Specifically, in S103, if the gas-steam combined cycle unit switches from the initial startup state to the normal operation state, it is determined that the switching control strategy corresponding to the state switching is the second control strategy; wherein, the second control strategy is: to open the first baffle, close the third baffle, and maintain the second baffle in the open state, so that the energy storage device can be kept at a higher temperature state.

[0055] Specifically, in S103, if the gas-steam combined cycle unit switches from the normal operation state to the speed reduction shutdown state, it is determined that the switching control strategy corresponding to the state switching is the third control strategy; wherein the third control strategy is: close the first damper, open the third damper, and maintain the second damper in the open state. In this way, the exhaust gas of the gas turbine is heated by the energy storage device before entering the waste heat boiler, which can effectively avoid the rapid decrease of the temperature of the heating surface of the waste heat boiler and reduce the stress peak of important components.

[0056] Specifically, in S103, if the gas-steam combined cycle unit switches from the speed reduction shutdown state to the complete shutdown state, the switching control strategy corresponding to the state switching is determined to be the fourth control strategy; wherein, the fourth control strategy is: close the second baffle and the third baffle, and maintain the first baffle in a closed state, so as to avoid excessive heat dissipation of the energy storage device.

[0057] Specifically, in S103, if the gas-steam combined cycle unit switches from a completely shut down state to a restart state, it is determined that the switching control strategy corresponding to the state switching is the fifth control strategy; wherein the fifth control strategy is: close the first damper, open the second damper and the third damper, and blow cold air from the engine side to the second flue branch, which can effectively avoid the rapid drop in the temperature of the heating surface of the waste heat boiler, and can remove impurities in the second flue branch, and ignite the engine after the blowing of cold air is completed. After the engine is ignited, the energy storage device cooled by the blowing cold air can continue to absorb the heat of the engine exhaust.

[0058] Such a cycle reduces the stress peak of important components of the waste heat boiler during the start-up and shutdown of the gas-steam combined cycle unit, increases the number of cold starts allowed for the unit, and effectively shortens the start-up and shutdown time of the unit.

[0059] S104, executing a switching control strategy for the gas-steam combined cycle unit.

[0060] After the switching control strategy is determined, the corresponding control instructions are generated. These instructions are transmitted to the actuators of each damper through the control system to instruct them to perform corresponding opening and closing operations.

[0061] The embodiment of the present application obtains real-time operating data of the gas-steam combined cycle unit; determines the real-time operating state of the gas-steam combined cycle unit according to the real-time operating data, wherein the real-time operating state includes an initial startup state, a normal operating state, a speed reduction shutdown state, a complete shutdown state and a restart state; in response to a switch in the real-time operating state of the gas-steam combined cycle unit, determines a switching control strategy corresponding to the state switch, wherein the switching control strategy includes opening and closing control of at least one of the first baffle, the second baffle and the third baffle; and executes the switching control strategy on the gas-steam combined cycle unit. During the start-up and shutdown process of the unit, the present application can significantly reduce the stress peak of important components of the waste heat boiler (such as superheater, steam drum, etc.) by delaying the temperature change rate of the flue gas entering the waste heat boiler, and can effectively reduce the thermal stress and fatigue of the components, increase the service life of the equipment, and reduce maintenance and replacement costs; due to the optimized control of the flue gas temperature change, the number of starts of the unit in the cold state is increased, which means that the unit can be started more frequently under low load or discontinuous operation without causing damage to the equipment, thereby improving the scheduling flexibility and operating efficiency of the unit; by optimizing the opening and closing control strategy of the damper, the start-up and shutdown time of the unit can be effectively shortened.

[0062] Figure 4 This is a schematic diagram of the design process of an energy storage device shown in this application, such as Figure 4 As shown, the design process of the energy storage device includes:

[0063] S401, establishing a unit model corresponding to the gas-steam combined cycle unit.

[0064] The unit model of the gas-steam combined cycle unit is established on the simulation platform. The unit model should be able to reflect the dynamic characteristics of the main components. The dynamic unit model is verified and modified according to the actual start-stop process curve of the unit.

[0065] S402, acquiring exhaust parameters of the combustion engine, and determining energy storage related parameters of the energy storage device according to the exhaust parameters, wherein the related parameters include material parameters and structural parameters of the energy storage device.

[0066] S403, performing transient flow field and temperature field simulation on the energy storage device to evaluate its thermodynamic behavior and fluid dynamic characteristics under different operating conditions.

[0067] Finite element analysis software is used to perform transient analysis of flow field and temperature field.

[0068] S404, establishing a mathematical model corresponding to the energy storage device, integrating the mathematical model into the unit model, and performing a unit cold start-stop simulation test on the integrated unit model based on a preset gas turbine load change rate.

[0069] S405, analyzing relevant components of the waste heat boiler according to the simulation experiment results to obtain analysis results.

[0070] According to the simulation experiment results, the mechanical stress, thermal stress and fatigue life analysis of the relevant components of the waste heat boiler are calculated in accordance with the relevant standards of pressure vessels, and the allowable cold start times of the relevant components of the waste heat boiler are solved.

[0071] If the analysis results meet the preset requirements, the energy storage related parameters will be used as the final parameters of the energy storage device.

[0072] If the analysis results do not meet the preset requirements, the energy storage related parameters of the energy storage device are adjusted (such as adjusting the cross-sectional area, length and other parameters of the energy storage device), and based on the adjusted energy storage related parameters, S403 transient flow field and temperature field simulation and subsequent steps are performed on the energy storage device until the energy storage related parameters that meet the preset requirements are obtained.

[0073] Figure 5 is a schematic diagram of a control device for a gas-steam combined cycle unit shown in the present application, such as Figure 5 As shown, the control device 500 of the gas-steam combined cycle unit includes a data acquisition module 501, a state determination module 502, a strategy determination module 503 and a strategy execution module 504, wherein:

[0074] The data acquisition module 501 is used to acquire the real-time operation data of the gas-steam combined cycle unit.

[0075] The state determination module 502 is used to determine the real-time operation state of the gas-steam combined cycle unit according to the real-time operation data, wherein the real-time operation state includes the initial startup state, the normal operation state, the speed reduction shutdown state, the complete shutdown state and the restart state.

[0076] The strategy determination module 503 is used to determine the switching control strategy corresponding to the state switching in response to the switching of the real-time operating state of the gas-steam combined cycle unit, wherein the switching control strategy includes opening and closing control of at least one of the first baffle, the second baffle and the third baffle.

[0077] The strategy execution module 504 is used to execute the switching control strategy for the gas-steam combined cycle unit.

[0078] During the start-up and shutdown process of the unit, this device can significantly reduce the stress peak of important components of the waste heat boiler (such as superheater, steam drum, etc.) by delaying the temperature change rate of the flue gas entering the waste heat boiler, and can effectively reduce the thermal stress and fatigue of the components, increase the service life of the equipment, and reduce maintenance and replacement costs; due to the optimized control of the flue gas temperature change, the number of unit starts in the cold state is increased, which means that the unit can be started more frequently under low load or discontinuous operation without causing damage to the equipment, thereby improving the scheduling flexibility and operating efficiency of the unit; by optimizing the opening and closing control strategy of the damper, the start-up and shutdown time of the unit can be effectively shortened.

[0079] Furthermore, the strategy determination module 503 is also used to: in response to the gas-steam combined cycle unit switching from a completely shut down state to an initial startup state, determine that the switching control strategy corresponding to the state switching is a first control strategy; wherein the first control strategy is: closing the first damper, and opening the second damper and the third damper.

[0080] Furthermore, the strategy determination module 503 is also used to: in response to the gas-steam combined cycle unit switching from the initial startup state to the normal operating state, determine that the switching control strategy corresponding to the state switching is the second control strategy; wherein the second control strategy is: to open the first damper, close the third damper, and maintain the second damper in the open state.

[0081] Furthermore, the strategy determination module 503 is also used to: in response to the gas-steam combined cycle unit switching from a normal operating state to a speed reduction shutdown state, determine that the switching control strategy corresponding to the state switching is a third control strategy; wherein the third control strategy is: close the first damper, open the third damper, and maintain the second damper in an open state.

[0082] Furthermore, the strategy determination module 503 is also used to: in response to the gas-steam combined cycle unit switching from a speed reduction shutdown state to a complete shutdown state, determine that the switching control strategy corresponding to the state switching is the fourth control strategy; wherein the fourth control strategy is: closing the second damper and the third damper, and maintaining the first damper in a closed state.

[0083] Furthermore, the strategy determination module 503 is also used to: in response to the gas-steam combined cycle unit switching from a completely shut down state to a restart state, determine that the switching control strategy corresponding to the state switching is the fifth control strategy; wherein the fifth control strategy is: closing the first damper, opening the second damper and the third damper, and blowing cold air from the side of the engine to the second flue branch, and igniting the engine after the blowing of cold air is completed.

[0084] Furthermore, the design process of the energy storage device involved in the control device 500 of the gas-steam combined cycle unit includes: establishing a unit model corresponding to the gas-steam combined cycle unit; obtaining the exhaust parameters of the gas turbine, and determining the energy storage related parameters of the energy storage device according to the exhaust parameters, the related parameters including the material parameters and structural parameters of the energy storage device, and performing transient flow field and temperature field simulation on the energy storage device to evaluate its thermodynamic behavior and fluid dynamic characteristics under different operating conditions; establishing a mathematical model corresponding to the energy storage device, and integrating the mathematical model into the unit model, and based on a preset gas turbine load change rate, performing a unit cold start and stop simulation test on the integrated unit model; analyzing the relevant components of the waste heat boiler according to the simulation experiment results to obtain analysis results; in response to the analysis results meeting the preset requirements, using the energy storage related parameters as the final parameters of the energy storage device; in response to the analysis results not meeting the preset requirements, adjusting the energy storage related parameters of the energy storage device, and performing transient flow field and temperature field simulation and subsequent steps on the energy storage device based on the adjusted energy storage related parameters, until the energy storage related parameters meeting the preset requirements are obtained.

[0085] Furthermore, the energy storage device involved in the control device 500 of the gas-steam combined cycle unit is a honeycomb structure.

[0086] In order to implement the above embodiment, the present application embodiment also proposes an electronic device 600, such as Figure 6 As shown, the electronic device 600 includes: a processor 601 and a memory 602 that is communicatively connected to the processor, the memory 602 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 601 to implement the control method of the gas-steam combined cycle unit as shown in the above embodiment.

[0087] In order to implement the above embodiment, the embodiment of the present application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to implement the control method of the gas-steam combined cycle unit shown in the above embodiment.

[0088] In order to implement the above embodiments, the embodiments of the present application also provide a computer program product, including a computer program, which, when executed by a processor, implements the control method of the gas-steam combined cycle unit as shown in the above embodiments.

[0089] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0090] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control method for a gas-steam combined cycle unit, applied to a gas-steam combined cycle unit, wherein: The gas-steam combined cycle unit comprises a gas engine, a waste heat boiler and a steam turbine, a first flue branch between the gas engine and the waste heat boiler is provided with a first baffle, a second flue branch between the gas engine and the waste heat boiler is provided with a second baffle, an energy storage device and a third baffle in sequence, the energy storage device is made of a heat conductive material, and the method comprises: Acquiring real-time operating data of the gas-steam combined cycle unit; Determining the real-time operating state of the gas-steam combined cycle unit according to the real-time operating data, wherein the real-time operating state includes an initial startup state, a normal operation state, a speed reduction shutdown state, a complete shutdown state, and a restart state; In response to a switch in the real-time operating state of the gas-steam combined cycle unit, a switch control strategy corresponding to the state switch is determined, wherein the switch control strategy includes opening and closing control of at least one of the first baffle, the second baffle, and the third baffle; The switching control strategy is executed on the gas-steam combined cycle unit.

2. The method according to claim 1, characterized in that In response to the real-time operating state of the gas-steam combined cycle unit switching, determining a switching control strategy corresponding to the state switching includes: In response to the gas-steam combined cycle unit switching from the complete shutdown state to the initial startup state, determining that the switching control strategy corresponding to the state switching is a first control strategy; Wherein, the first control strategy is: closing the first baffle, and opening the second baffle and the third baffle.

3. The method according to claim 2, characterized in that In response to the real-time operating state of the gas-steam combined cycle unit switching, determining a switching control strategy corresponding to the state switching includes: In response to the gas-steam combined cycle unit switching from the initial startup state to the normal operation state, determining that the switching control strategy corresponding to the state switching is a second control strategy; Wherein, the second control strategy is to open the first baffle, close the third baffle, and maintain the second baffle in an open state.

4. The method according to claim 3, characterized in that In response to the real-time operating state of the gas-steam combined cycle unit switching, determining a switching control strategy corresponding to the state switching includes: In response to the gas-steam combined cycle unit switching from the normal operating state to the speed reduction shutdown state, determining that the switching control strategy corresponding to the state switching is a third control strategy; Wherein, the third control strategy is: closing the first baffle, opening the third baffle, and maintaining the second baffle in an open state.

5. The method according to claim 4, characterized in that In response to the real-time operating state of the gas-steam combined cycle unit switching, determining a switching control strategy corresponding to the state switching includes: In response to the gas-steam combined cycle unit switching from the speed reduction shutdown state to the complete shutdown state, determining that the switching control strategy corresponding to the state switching is a fourth control strategy; Wherein, the fourth control strategy is: closing the second baffle and the third baffle, and maintaining the first baffle in a closed state.

6. The method according to claim 5, characterized in that In response to the real-time operating state of the gas-steam combined cycle unit switching, determining a switching control strategy corresponding to the state switching includes: In response to the gas-steam combined cycle unit switching from the complete shutdown state to the restart state, determining that the switching control strategy corresponding to the state switching is a fifth control strategy; The fifth control strategy is to close the first damper, open the second damper and the third damper, blow cold air from the engine side to the second flue branch, and ignite the engine after the blowing of cold air is completed.

7. The method according to any one of claims 1 to 6, characterized in that: The design process of the energy storage device includes: Establishing a unit model corresponding to the gas-steam combined cycle unit; Acquiring exhaust parameters of the combustion engine, and determining energy storage related parameters of the energy storage device according to the exhaust parameters, wherein the related parameters include material parameters and structural parameters of the energy storage device, and performing transient flow field and temperature field simulation on the energy storage device to evaluate its thermodynamic behavior and fluid dynamic characteristics under different operating conditions; Establishing a mathematical model corresponding to the energy storage device, integrating the mathematical model into the unit model, and performing a unit cold start-stop simulation test on the integrated unit model based on a preset gas turbine load change rate; Analyze the relevant components of the waste heat boiler according to the simulation experiment results to obtain analysis results; In response to the analysis result satisfying a preset requirement, taking the energy storage related parameter as a final parameter of the energy storage device; In response to the analysis result not meeting the preset requirements, the energy storage related parameters of the energy storage device are adjusted, and based on the adjusted energy storage related parameters, transient flow field and temperature field simulation and subsequent steps are performed on the energy storage device until the energy storage related parameters meeting the preset requirements are obtained.

8. The method according to any one of claims 1 to 6, characterized in that: The energy storage device is a honeycomb structure.

9. A control device for a gas-steam combined cycle unit, characterized in that: include: A data acquisition module, used to acquire real-time operating data of the gas-steam combined cycle unit; a state determination module, configured to determine the real-time operation state of the gas-steam combined cycle unit according to the real-time operation data, wherein the real-time operation state includes an initial startup state, a normal operation state, a speed reduction shutdown state, a complete shutdown state, and a restart state; a strategy determination module, configured to determine a switching control strategy corresponding to the state switching in response to a switching of the real-time operating state of the gas-steam combined cycle unit, wherein the switching control strategy includes opening and closing control of at least one of the first damper, the second damper, and the third damper; A strategy execution module is used to execute the switching control strategy for the gas-steam combined cycle unit.

10. A gas-steam combined cycle unit, applied to the control method according to any one of claims 1 to 8, wherein the gas-steam combined cycle unit comprises a gas engine, a waste heat boiler and a steam turbine, and is characterized in that: The first flue branch between the gas turbine and the waste heat boiler is provided with a first baffle; The second flue branch between the gas turbine and the waste heat boiler is provided with a second baffle, an energy storage device and a third baffle in sequence; The energy storage device is made of heat-conducting material.

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