Whole-process control method and system for drum water level of gas turbine waste heat boiler

Abstract

The invention relates to a gas turbine waste heat boiler drum water level whole-process control method which comprises the steps that operation data of a gas turbine are obtained, the operation stage of the gas turbine is determined, a low-pressure adjusting instruction, a medium-pressure adjusting instruction and a high-pressure adjusting instruction are generated according to the operation data and preset control rules corresponding to the operation stage, and the low-pressure adjusting instruction, the medium-pressure adjusting instruction and the high-pressure adjusting instruction are controlled. And the low-pressure adjusting instruction, the medium-pressure adjusting instruction and the high-pressure adjusting instruction are responded to control the steam drum water level of the gas turbine waste heat boiler. By means of the control method and device, the problem that the drum water level control intelligence of the waste heat boiler is poor is solved, adjustment is conducted through different control rules in different operation stages, rapid, stable and automatic control over boiler water supply is achieved, and the automation level of a unit is improved.

Description

Technical Field

[0001] The present application relates to the field of power system control, and in particular to a method and system for controlling the water level of a steam drum of a waste heat boiler of a gas turbine. Background Art

[0002] In recent years, gas turbines and their combined cycle units have developed rapidly due to their high efficiency, low emissions, flexible start and stop, and good peak load performance. At the same time, they are mainly used as peak load units in the power grid structure, and they are frequently started and stopped during the day and at night. In order to meet the needs of frequent start and stop, rapid startup and timely peak load regulation of combined cycle units, the implementation of the unit automatic start and stop control system (Automatic Plant Startup and Shutdown System, referred to as APS) has become an inevitable trend.

[0003] In the related technologies, the automatic control effect of waste heat boiler feed water control is good only when the unit load is stable. However, during the start-up and shutdown process, especially at special nodes such as boiler expansion pressure, opening of the medium-pressure superheater outlet, and turbine grid connection, false water levels are very likely to appear due to the small size of the waste heat boiler drum, resulting in unsatisfactory automatic control effects, and most of them are still mainly operated manually. Moreover, the target values ​​of the drum liquid level control are different at different stages.

[0004] Currently, no effective solution has been proposed for the problem of poor intelligence of waste heat boiler drum water level control in related technologies. Summary of the invention

[0005] The embodiments of the present application provide a method, system, electronic device and storage medium for full-process control of the water level in the drum of a waste heat boiler of a gas turbine, so as to at least solve the problem of poor intelligence of the water level control in the drum of the waste heat boiler in the related art.

[0006] In a first aspect, an embodiment of the present application provides a method for controlling the drum water level of a waste heat boiler of a gas turbine, characterized in that the method comprises:

[0007] Acquiring operating data of the gas engine and determining the operating stage of the gas engine;

[0008] Generate a low-voltage regulation instruction, a medium-voltage regulation instruction, and a high-voltage regulation instruction according to the operation data and the preset control rules corresponding to the operation stage;

[0009] Respond to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

[0010] In some embodiments, generating a low-voltage regulation instruction, a medium-voltage regulation instruction, and a high-voltage regulation instruction according to the operation data and the preset control rules corresponding to the operation stage includes:

[0011] Generate the low-pressure adjustment instruction based on the low-pressure control rule corresponding to the operation stage, and the liquid level data, pressure data and flow data in the operation data;

[0012] Based on the medium pressure control rule corresponding to the operation stage, and the liquid level data, flow data and turbine speed in the operation data, the medium pressure regulation instruction is generated;

[0013] The high-pressure regulating instruction is generated based on the high-pressure control rule corresponding to the operation stage, and the liquid level data, flow data and temperature data in the operation data.

[0014] In some embodiments, the flow data includes condensate flow, the pressure data includes condensate pump outlet pressure, and the liquid level data includes condenser liquid level and low-pressure drum water level; the low-pressure control rule corresponding to the operation stage, and the liquid level data, pressure data and flow data in the operation data are generated to generate the low-pressure adjustment instruction, including:

[0015] When the operation stage is the water supply stage, generating a first low-pressure regulation instruction according to the condensate flow, the condensate pump outlet pressure and the condenser liquid level;

[0016] When the operation stage is after the air supply is put into operation, a second low-pressure regulating instruction is generated according to the low-pressure drum water level;

[0017] When the operation stage is the APS regulation stage, a third low-pressure regulation instruction is generated according to the low-pressure drum water level.

[0018] In some embodiments, the flow data includes the steam flow at the outlet of the medium-pressure superheater, and the liquid level data includes the water level of the medium-pressure drum; the generating the medium-pressure regulating instruction based on the medium-pressure control rule corresponding to the operation stage, and the liquid level data, flow data and turbine speed in the operation data includes:

[0019] When the operation stage is the bypass opening stage, generating a first intermediate pressure regulating instruction according to the steam flow at the intermediate pressure superheater outlet and the intermediate pressure drum water level;

[0020] When the operation stage is the turbine start-up stage, generating a second intermediate pressure regulation instruction according to the turbine speed and the intermediate pressure drum water level;

[0021] When the operation stage is the turbine grid-connected stage, a third medium-pressure regulating instruction is generated according to a preset drum water level value.

[0022] In some embodiments, the method further comprises:

[0023] Determine whether the operation phase is a water supply phase,

[0024] If yes, a first medium-pressure fixed discharge instruction is generated according to the first preset water level threshold and the medium-pressure drum water level.

[0025] If not, when the APS sequence is not completed, a second medium-pressure fixed discharge instruction is generated according to the second preset water level threshold and the medium-pressure drum water level.

[0026] In some embodiments, the flow data includes the main steam flow rate above the outlet, the liquid level data includes the water level of the low-pressure drum, and the temperature data includes the temperature difference between the upper and lower walls of the high-pressure drum; the high-pressure control rule corresponding to the operation stage, and the flow data, liquid level data and temperature data in the operation data, generating the high-pressure adjustment instruction includes:

[0027] When the operation stage is the stage of gas turbine grid connection and high bypass opening, generating a first high pressure regulating instruction according to the high bypass outlet main steam flow;

[0028] When the operation stage is the water filling stage, a second high-pressure regulating instruction is generated according to the low-pressure drum water level and the temperature difference between the upper and lower walls of the high-pressure drum.

[0029] In some embodiments, the liquid level data includes a high-pressure drum water level; the method further comprises:

[0030] Determine whether the operation phase is a water supply phase,

[0031] If yes, a first high pressure fixed discharge instruction is generated according to the third preset water level threshold and the high pressure drum water level.

[0032] If not, when the APS sequence is not completed, a second high-pressure discharge instruction is generated according to the fourth preset water level threshold and the high-pressure drum water level.

[0033] In a second aspect, an embodiment of the present application provides a whole-process control system for the water level of a drum of a gas turbine waste heat boiler, the system comprising:

[0034] A data acquisition module, used to acquire the operating data of the gas engine and determine the operating stage of the gas engine;

[0035] An instruction generation module, used to generate a low-voltage regulation instruction, a medium-voltage regulation instruction and a high-voltage regulation instruction according to the operation data and a preset control rule corresponding to the operation stage;

[0036] The control module is used to respond to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

[0037] In a third aspect, an embodiment of the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for controlling the water level of a steam drum of a waste heat boiler of a gas turbine is implemented as described in the first aspect above.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for controlling the water level of a steam drum of a waste heat boiler of a gas turbine as described in the first aspect above.

[0039] Compared with the related art, the method for full-process control of the water level in the drum of a waste heat boiler of a gas turbine provided in the embodiment of the present application obtains the operating data of the gas turbine and determines the operating stage of the gas turbine, generates low-pressure adjustment instructions, medium-pressure adjustment instructions and high-pressure adjustment instructions according to preset control rules corresponding to the operating data and the operating stage, and responds to the low-pressure adjustment instructions, medium-pressure adjustment instructions and high-pressure adjustment instructions to control the water level in the drum of the waste heat boiler of the gas turbine, thereby solving the problem of poor intelligence in the control of the water level in the drum of the waste heat boiler. Different operating stages are adjusted through different control rules, thereby realizing rapid, stable and automatic control of boiler feed water, and improving the automation level of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0041] Figure 1 is a flow chart of a method for controlling the water level of a waste heat boiler drum of a gas turbine according to an embodiment of the present application;

[0042] Figure 2 It is a structural schematic diagram of a waste heat boiler drum feed water system according to an embodiment of the present application;

[0043] Figure 3 It is a structural block diagram of a whole-process control system of a steam drum water level of a waste heat boiler of a gas turbine according to an embodiment of the present application;

[0044] Figure 4 It is a schematic diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0046] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0047] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0048] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0049] This embodiment provides a method for controlling the water level in the drum of a waste heat boiler of a gas turbine throughout the entire process. Figure 1 : is a flow chart of a method for controlling the drum water level of a waste heat boiler of a gas turbine according to an embodiment of the present application. Figure 1 As shown, the process includes the following steps:

[0050] Step S101, obtaining the operating data of the gas engine and determining the operating stage of the gas engine.

[0051] The operation data includes but is not limited to liquid level data, pressure data, flow data, temperature data and turbine speed. In this embodiment, the low pressure drum water level, medium pressure drum water level and high pressure drum water level are controlled by analyzing the operation data corresponding to different operation stages. Figure 2 It is a schematic structural diagram of a waste heat boiler drum feed water system according to an embodiment of the present application.

[0052] Step S102, generating a low-pressure regulating instruction, a medium-pressure regulating instruction and a high-pressure regulating instruction according to the operating data and the preset control rules corresponding to the operating stage.

[0053] In some embodiments, step S102 specifically includes:

[0054] Step S1021, generating a low-pressure adjustment instruction based on the low-pressure control rule corresponding to the operation stage, and the liquid level data, pressure data and flow data in the operation data.

[0055] In some embodiments, the flow data includes the condensate flow, the pressure data includes the condensate pump outlet pressure, and the liquid level data includes the condenser liquid level and the low-pressure drum water level; step S1021 includes:

[0056] Step S201, when the operation stage is the water supply stage, a first low-pressure regulating instruction is generated according to the condensate flow rate, the condensate pump outlet pressure and the condenser liquid level.

[0057] The low voltage control rule includes the following logic:

[0058] Low-pressure logic 1: The condensate flow rate is higher than the first water flow threshold (eg, 500 t / h), and the low-pressure water supply valve adjustment instruction is superimposed with the preset opening (eg, -5% opening).

[0059] Low-pressure logic 2: When the condensate pump outlet pressure is lower than the first pressure threshold (e.g., 1.8MPa), the low-pressure water supply regulating valve is superimposed with the first opening (e.g., -5% opening); when the condensate pump outlet pressure is lower than the second pressure threshold (e.g., 1.6MPa), the low-pressure water supply regulating valve is superimposed with the second opening (e.g., -10% opening).

[0060] Low pressure logic 3: When the condenser liquid level is lower than the first liquid level threshold (e.g., 750mm), the low-pressure feed water regulating command is superimposed with the first opening (e.g., -5% opening); when the condenser liquid level is lower than the second liquid level threshold (e.g., 700mm), the low-pressure feed water regulating command is superimposed with the second opening (e.g., -10% opening).

[0061] In the low-pressure water supply sequence, the smaller of the above low-pressure logic 1, low-pressure logic 2 and low-pressure logic 3 is taken and superimposed on the low-pressure water supply regulating instruction.

[0062] Step S202, when the operation stage is after the air supply is put into operation, a second low-pressure regulating instruction is generated according to the low-pressure drum water level.

[0063] After the air supply is put into operation, the liquid level of the low-pressure drum decreases, and the operation is automatic. The liquid level is automatically adjusted according to the set value. Optionally, the set value is -350mm. At the same time, the upper limit of the opening of the low-pressure feed water regulating valve is set (e.g., 70%). If the liquid level reaches the threshold (e.g., -360mm), the upper limit of the opening is cancelled. The automatic adjustment can be set to a delayed trigger. For example, if the current liquid level is 3mm lower than the liquid level 5s ago, it will be triggered with a delay of 3s.

[0064] Step S203, when the operation stage is the APS regulation stage, a third low-pressure regulation instruction is generated according to the low-pressure drum water level.

[0065] During the APS regulation stage, the low-pressure drum water level is higher than the water level threshold (eg, 0 mm), and the low-pressure feedwater valve control instruction is superimposed with a preset opening (eg, -5%).

[0066] Step S1022, generating a medium pressure regulation instruction based on the medium pressure control rule corresponding to the operation stage, and the liquid level data, flow data and turbine speed in the operation data.

[0067] In some embodiments, the method further comprises:

[0068] Determine whether the operation stage is the water supply stage. If so, generate the first medium-pressure fixed-discharge instruction according to the first preset water level threshold and the medium-pressure drum water level. If not, generate the second medium-pressure fixed-discharge instruction according to the second preset water level threshold and the medium-pressure drum water level when the APS sequence is not completed.

[0069] It should be noted that the first preset water level threshold includes the upper and lower limits of the first water level, and the second preset water level threshold includes the upper and lower limits of the second water level. During the water filling stage, if the water level of the medium-pressure drum is higher than the upper limit of the first water level (e.g., -120mm), the medium-pressure fixed discharge will automatically open; if it is lower than the lower limit of the first water level (e.g., -180mm), the medium-pressure fixed discharge will automatically close. In other states, if it is higher than the upper limit of the second water level (e.g., 0mm), the medium-pressure fixed discharge will automatically open; if it is lower than the lower limit of the second water level (e.g., -50mm), the medium-pressure fixed discharge will automatically close. After the APS sequence is completed, the fixed discharge automatic switch function exits.

[0070] In some embodiments, the flow data includes the steam flow at the outlet of the medium-pressure superheater, and the liquid level data includes the water level of the medium-pressure drum; step S1022 specifically includes:

[0071] Step S301, when the operation stage is the bypass opening stage, a first medium-pressure regulating instruction is generated according to the steam flow at the outlet of the medium-pressure superheater and the water level of the medium-pressure drum.

[0072] After the bypass is opened, the steam flow at the outlet of the medium-pressure superheater increases. After it reaches the preset value (e.g., 30t / h), when the liquid level drops below the set value (e.g., -200mm), the preset opening (e.g., 10%) is superimposed on the medium-pressure control command outlet. Thereafter, every time the liquid level drops by a certain amount (e.g., 50mm), the control valve command feedforward amount increases by the preset opening (e.g., 10%), and the command outlet upper limit is set, for example, the final command outlet is at most 55%.

[0073] Step S302, when the operation phase is the turbine start-up phase, a second intermediate pressure regulating instruction is generated according to the turbine speed and the intermediate pressure drum water level.

[0074] After the turbine is started, when the speed is less than the first speed, if the liquid level is slightly longer (the current liquid level is 30mm higher than the liquid level 5s ago, and the delay is 3s), the set value is increased. Optionally, the set value is increased to -80mm (3 minutes after the high-discharge reverse door is fully opened is used as the reset condition). Every time the liquid level is reduced by a certain amount (e.g., 50mm), the preset opening (e.g., 15%) is superimposed to the mid-adjustment command outlet, and the upper limit of the command outlet is set, such as the final command outlet is up to 55%.

[0075] When the turbine speed is greater than the first speed and less than the second speed, if the valve opening is less than 10%, the feedwater regulating valve is manually switched to open the feedwater regulating valve by 10%.

[0076] When the speed is greater than the second speed, and the turbine is connected to the grid and the high-discharge check valve closing signal disappears, the delay is set until the preset time (e.g., 3 minutes), and the adjustment is performed according to the following rules:

[0077] The liquid level has a downward trend (the current liquid level is 30mm lower than the liquid level 5s ago, and the delay is 2s to trigger), the water supply valve is opened to the preset value (e.g., 50%), and the conditions for manual cutting are added.

[0078] When the liquid level shows a rising trend (the current liquid level is 30mm higher than the liquid level 5s ago, and the trigger is delayed by 2s), the regulating valve instruction is given according to the broken line function of the middle package liquid level. For example, the liquid level of -50mm corresponds to the middle regulating opening of 15%, the liquid level of -100mm corresponds to the middle regulating opening of 30%, the liquid level of -200mm corresponds to the middle regulating opening of 40%, and the liquid level of -250mm corresponds to the middle regulating opening of 50%.

[0079] Optionally, the first rotational speed is not 2200 rpm, and the second rotational speed is not 2800 rpm.

[0080] Step S303, when the operation stage is the turbine grid-connected stage, a third medium pressure regulating instruction is generated according to a preset drum water level value.

[0081] After the steam turbine is connected to the grid and the high-pressure check valve is fully opened, there is a delay of 3 minutes. As the liquid level tends to be stable, the intermediate regulation is automatically put into operation to automatically adjust the medium-pressure drum water level according to the first set value. Optionally, the first set value is -100mm.

[0082] After the steam turbine is connected to the grid and the AGC is put into operation, the water level of the medium-pressure drum is automatically adjusted according to the second set value. Optionally, the second set value is -50mm.

[0083] After the engine is ignited, the continuous discharge valve is opened according to a preset value. Optionally, the preset value is 5%.

[0084] After water filling is completed, open the smoke damper door.

[0085] Step S1023, generating a high-pressure adjustment instruction based on the high-pressure control rule corresponding to the operation stage, and the liquid level data, flow data and temperature data in the operation data.

[0086] In some embodiments, the liquid level data includes a high pressure drum water level; and the method further comprises:

[0087] Determine whether the operation stage is the water supply stage. If so, generate the first high-pressure discharge instruction according to the third preset water level threshold and the high-pressure drum water level. If not, generate the second high-pressure discharge instruction according to the fourth preset water level threshold and the high-pressure drum water level when the APS step is not completed.

[0088] It should be noted that the third preset water level threshold includes the upper and lower limits of the third water level, and the fourth preset water level threshold includes the upper and lower limits of the fourth water level. During the water filling stage, if the high-pressure drum water level is higher than the upper limit of the third water level (e.g., -100mm), the high-pressure fixed discharge will automatically open; if it is lower than the lower limit of the third water level (e.g., -200mm), the high-pressure fixed discharge will automatically close. In other states, if it is higher than the upper limit of the fourth water level (e.g., 0mm), the high-pressure fixed discharge will automatically open; if it is lower than the lower limit of the fourth water level (e.g., -50mm), the high-pressure fixed discharge will automatically close. After the APS sequence is completed, the fixed discharge automatic switch function exits.

[0089] In some embodiments, the flow data includes the main steam flow rate above the outlet, the liquid level data includes the low-pressure drum water level, and the temperature data includes the temperature difference between the upper and lower walls of the high-pressure drum; step S1023 includes:

[0090] Step S401, when the operation stage is the stage of gas turbine grid connection and high bypass opening, a first high pressure regulating instruction is generated according to the high-pressure outlet main steam flow.

[0091] After the gas turbine is connected to the grid and the high bypass is turned on, when the outlet main steam flow rate is higher than the preset steam flow threshold (e.g., 50t / h), the high-pressure regulating valve water level set value limit rate is changed. Optionally, the set value limit rate is changed to -150mm.

[0092] Step S402, when the operation stage is the water filling stage, a second high-pressure regulating instruction is generated according to the low-pressure drum water level and the temperature difference between the upper and lower walls of the high-pressure drum.

[0093] The high voltage control rule includes the following logic:

[0094] High-pressure logic 1: When the low-bag liquid level is -650mm, the high-pressure water supply valve regulating command is not adjusted; when the low-bag liquid level is greater than the second low-bag threshold (such as -700mm), the high-pressure water supply valve regulating command is superimposed with the first opening (such as -5%); when the low-bag liquid level is greater than the third low-bag threshold (such as -750mm), the high-pressure water supply valve regulating command is superimposed with the second opening (such as -10%).

[0095] High-pressure logic 2: If the temperature difference between the upper and lower walls of the high-pressure steam drum is greater than the first temperature difference threshold (e.g., 40°C), the high-pressure feed water regulating valve instruction is superimposed with the first opening (e.g., -5%). If the temperature difference between the upper and lower walls of the high-pressure steam drum is greater than the second temperature difference threshold (e.g., 45°C), the high-pressure feed water regulating valve instruction is superimposed with the second opening (e.g., -10%).

[0096] In the high-pressure drum water supply sequence, the above-mentioned high-pressure logic 1 and high-pressure logic 2 are taken as the smaller one and superimposed on the high-pressure water supply regulating command.

[0097] During the APS operation, if the set value and feedback value in the differential pressure control are less than 1.5, the frequency will be delayed for 10 seconds and 5Hz will be added to the current actual frequency.

[0098] After the engine is ignited, the continuous discharge valve is opened according to a preset value. Optionally, the preset value is 5%.

[0099] Continue to refer to Figure 1 After generating the adjustment instruction, execute step S103.

[0100] Step S103, responding to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

[0101] This embodiment realizes automatic control of the drum water level for the gas turbine combined cycle unit during the periods of boiler expansion and pressure rise, opening of the medium-pressure superheater outlet, and turbine run-up and grid connection, thereby solving the problem of delayed or even opposite automatic control effect caused by false drum water level, and realizing rapid and stable automatic control of boiler feed water.

[0102] Through the above steps, the operating data of the gas turbine is obtained, and the operating stage of the gas turbine is determined. According to the preset control rules corresponding to the operating data and the operating stage, low-pressure regulation instructions, medium-pressure regulation instructions and high-pressure regulation instructions are generated. The low-pressure regulation instructions, medium-pressure regulation instructions and high-pressure regulation instructions are responded to to control the drum water level of the gas turbine waste heat boiler, thereby solving the problem of poor intelligence of the waste heat boiler drum water level control. Different operating stages are adjusted through different control rules, thereby realizing rapid, stable and automatic control of boiler feed water, and improving the automation level of the unit.

[0103] It should be noted that the steps shown in the above process or the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0104] This embodiment also provides a whole-process control system for the water level of the drum of a waste heat boiler of a gas turbine, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. As used below, the terms "module", "unit", "subunit", etc. can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0105] Figure 3 : is a structural block diagram of a whole-process control system of a waste heat boiler drum water level of a gas turbine according to an embodiment of the present application, such as Figure 3 As shown, the system includes:

[0106] The data acquisition module 31 is used to acquire the operating data of the gas engine and determine the operating stage of the gas engine.

[0107] The instruction generation module 32 is used to generate a low-voltage regulation instruction, a medium-voltage regulation instruction and a high-voltage regulation instruction according to the operation data and the preset control rules corresponding to the operation stage.

[0108] The control module 33 is used to respond to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the waste heat boiler of the gas turbine.

[0109] In some embodiments, the instruction generation module 32 includes:

[0110] The low-pressure instruction generation module is used to generate a low-pressure adjustment instruction based on the low-pressure control rules corresponding to the operation stage, as well as the liquid level data, pressure data and flow data in the operation data.

[0111] The medium pressure instruction generation module is used to generate medium pressure regulation instructions based on the medium pressure control rules corresponding to the operation stage, as well as the liquid level data, flow data and steam turbine speed in the operation data.

[0112] The high-pressure instruction generation module is used to generate a high-pressure adjustment instruction based on the high-pressure control rules corresponding to the operation stage, as well as the liquid level data, flow data and temperature data in the operation data.

[0113] In some embodiments, the flow data includes the condensate flow, the pressure data includes the condensate pump outlet pressure, and the liquid level data includes the condenser liquid level and the low-pressure drum water level; the low-pressure instruction generation module includes:

[0114] The first low-pressure module is used to generate a first low-pressure regulating instruction according to the condensate flow, the condensate pump outlet pressure and the condenser liquid level when the operating stage is the water supply stage.

[0115] The second low-pressure module is used to generate a second low-pressure regulating instruction according to the condenser liquid level when the operating stage is after the air supply is put into operation.

[0116] The third low-pressure module is used to generate a third low-pressure regulating instruction according to the low-pressure drum water level when the operating stage is the APS regulating stage.

[0117] In some embodiments, the flow data includes the steam flow at the outlet of the medium-pressure superheater, and the liquid level data includes the water level of the medium-pressure drum; the medium-pressure instruction generation module includes:

[0118] The first intermediate pressure module is used to generate a first intermediate pressure regulating instruction according to the steam flow at the outlet of the intermediate pressure superheater and the water level of the intermediate pressure drum when the operation stage is the bypass opening stage.

[0119] The second medium-pressure module is used to generate a second medium-pressure regulating instruction according to the steam turbine speed and the medium-pressure drum water level when the operating stage is the steam turbine start-up stage.

[0120] The third medium pressure module is used to generate a third medium pressure regulating instruction according to a preset steam drum water level value when the operation stage is the steam turbine grid-connected stage.

[0121] In some embodiments, the medium voltage instruction generation module further includes:

[0122] The medium-pressure fixed-discharge module is used to determine whether the operation stage is the water supply stage. If so, a first medium-pressure fixed-discharge instruction is generated according to a first preset water level threshold and the medium-pressure drum water level. If not, when the APS step is not completed, a second medium-pressure fixed-discharge instruction is generated according to a second preset water level threshold and the medium-pressure drum water level.

[0123] In some embodiments, the flow data includes the main steam flow rate above the outlet, the liquid level data includes the low-pressure drum water level, and the temperature data includes the temperature difference between the upper and lower walls of the high-pressure drum; the high-pressure instruction generation module includes:

[0124] The first high-pressure module is used to generate a first high-pressure regulating instruction according to the high-pressure outlet main steam flow when the operation stage is the gas turbine grid-connected and the high bypass is turned on stage;

[0125] The second high-pressure module is used to generate a second high-pressure regulating instruction according to the low-pressure steam drum water level and the temperature difference between the upper and lower walls of the high-pressure steam drum when the operating stage is the water filling stage.

[0126] In some embodiments, the liquid level data includes a high-pressure drum water level; and the high-pressure instruction generating module further includes:

[0127] The high-pressure discharge module is used to determine whether the operating stage is the water supply stage. If so, a first high-pressure discharge instruction is generated according to the third preset water level threshold and the high-pressure drum water level. If not, when the APS step is not completed, a second high-pressure discharge instruction is generated according to the fourth preset water level threshold and the high-pressure drum water level.

[0128] Through the above system, the data acquisition module 31 acquires the operating data of the gas turbine and determines the operating stage of the gas turbine. The instruction generation module 32 generates low-pressure adjustment instructions, medium-pressure adjustment instructions and high-pressure adjustment instructions according to the preset control rules corresponding to the operating data and the operating stage. The control module 33 responds to the low-pressure adjustment instructions, medium-pressure adjustment instructions and high-pressure adjustment instructions to control the drum water level of the gas turbine waste heat boiler, thereby solving the problem of poor intelligence of the waste heat boiler drum water level control. Different operating stages are adjusted through different control rules, thereby realizing rapid, stable and automatic control of boiler feed water, and improving the automation level of the unit.

[0129] It should be noted that the above modules can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0130] This embodiment further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0131] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0132] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0133] S1, obtaining the operating data of the gas turbine and determining the operating stage of the gas turbine.

[0134] S2, generating a low-voltage regulation instruction, a medium-voltage regulation instruction and a high-voltage regulation instruction according to the preset control rules corresponding to the operation data and the operation stage.

[0135] S3, responds to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

[0136] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0137] In one embodiment, Figure 4 is a schematic diagram of the internal structure of an electronic device according to an embodiment of the present application, such as Figure 4 As shown, an electronic device is provided, which may be a server, and its internal structure diagram may be as shown in Figure 4 As shown. The electronic device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for controlling the water level of a steam drum of a waste heat boiler of a gas turbine is implemented.

[0138] Those skilled in the art will understand that Figure 4 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0139] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0140] Those skilled in the art should understand that the technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for controlling the water level of a drum of a gas turbine waste heat boiler, characterized in that: The method comprises: Acquiring operating data of the gas engine and determining the operating stage of the gas engine; Generate a low-voltage regulation instruction, a medium-voltage regulation instruction, and a high-voltage regulation instruction according to the operation data and the preset control rules corresponding to the operation stage; Respond to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

2. The method according to claim 1, characterized in that The generating of the low-voltage regulation instruction, the medium-voltage regulation instruction and the high-voltage regulation instruction according to the operation data and the preset control rules corresponding to the operation stage comprises: Generate the low-pressure adjustment instruction based on the low-pressure control rule corresponding to the operation stage, and the liquid level data, pressure data and flow data in the operation data; Based on the medium pressure control rule corresponding to the operation stage, and the liquid level data, flow data and turbine speed in the operation data, the medium pressure regulation instruction is generated; The high-pressure regulating instruction is generated based on the high-pressure control rule corresponding to the operation stage, and the liquid level data, flow data and temperature data in the operation data.

3. The method according to claim 2, characterized in that The flow data includes condensate flow, the pressure data includes condensate pump outlet pressure, and the liquid level data includes condenser liquid level and low-pressure drum water level; the low-pressure control rule corresponding to the operation stage, and the liquid level data, pressure data and flow data in the operation data are used to generate the low-pressure adjustment instruction, including: When the operation stage is the water supply stage, generating a first low-pressure regulation instruction according to the condensate flow, the condensate pump outlet pressure and the condenser liquid level; When the operation stage is after the air supply is put into operation, a second low-pressure regulating instruction is generated according to the low-pressure drum water level; When the operation stage is the APS regulation stage, a third low-pressure regulation instruction is generated according to the low-pressure drum water level.

4. The method according to claim 2, characterized in that: The flow data includes the steam flow at the outlet of the medium-pressure superheater, and the liquid level data includes the water level of the medium-pressure drum; the generating of the medium-pressure regulating instruction based on the medium-pressure control rule corresponding to the operation stage, and the liquid level data, flow data and turbine speed in the operation data includes: When the operation stage is the bypass opening stage, generating a first intermediate pressure regulating instruction according to the steam flow at the intermediate pressure superheater outlet and the intermediate pressure drum water level; When the operation stage is the turbine start-up stage, generating a second intermediate pressure regulation instruction according to the turbine speed and the intermediate pressure drum water level; When the operation stage is the turbine grid-connected stage, a third medium-pressure regulating instruction is generated according to a preset drum water level value.

5. The method according to claim 4, characterized in that The method further comprises: Determine whether the operation phase is a water supply phase, If yes, a first medium-pressure fixed discharge instruction is generated according to the first preset water level threshold and the medium-pressure drum water level. If not, when the APS sequence is not completed, a second medium-pressure fixed discharge instruction is generated according to the second preset water level threshold and the medium-pressure drum water level.

6. The method according to claim 2, characterized in that The flow data includes the main steam flow rate above the outlet, the liquid level data includes the water level of the low-pressure drum, and the temperature data includes the temperature difference between the upper and lower walls of the high-pressure drum; the high-pressure control rule corresponding to the operation stage, and the flow data, liquid level data and temperature data in the operation data, generating the high-pressure regulation instruction includes: When the operation stage is the stage of gas turbine grid connection and high bypass opening, generating a first high pressure regulating instruction according to the high bypass outlet main steam flow; When the operation stage is the water filling stage, a second high-pressure regulating instruction is generated according to the low-pressure drum water level and the temperature difference between the upper and lower walls of the high-pressure drum.

7. The method according to claim 6, characterized in that The liquid level data includes the high-pressure drum water level; the method further includes: Determine whether the operation phase is a water supply phase, If yes, a first high pressure fixed discharge instruction is generated according to the third preset water level threshold and the high pressure drum water level. If not, when the APS sequence is not completed, a second high-pressure discharge instruction is generated according to the fourth preset water level threshold and the high-pressure drum water level.

8. A full-process control system for the drum water level of a gas turbine waste heat boiler, characterized in that: The system comprises: A data acquisition module, used to acquire the operating data of the gas engine and determine the operating stage of the gas engine; An instruction generation module, used to generate a low-voltage regulation instruction, a medium-voltage regulation instruction and a high-voltage regulation instruction according to the operation data and a preset control rule corresponding to the operation stage; The control module is used to respond to the low pressure regulation instruction, the medium pressure regulation instruction and the high pressure regulation instruction to control the drum water level of the gas turbine waste heat boiler.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for controlling the drum water level of a waste heat boiler of a gas turbine is implemented as described in any one of claims 1 to 7.

10. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for controlling the water level of a waste heat boiler drum of a gas turbine as described in any one of claims 1 to 7 is implemented.

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