Automatic pressure-maintaining starting control system, method and equipment for medium-pressure system of boiler of gas turbine unit

Abstract

The invention provides a gas unit boiler medium-pressure system pressure maintaining automatic starting control system, method and equipment, and the system comprises an instruction triggering module which is used for triggering according to a water supply switching main path instruction or a water supply switching bypass instruction; the main water supply gate opening and closing state judgment module is used for judging the opening and closing state of a main water supply gate according to the difference value between the water supply flow set value and the water supply flow and the difference value between the water supply flow and the time delay value of the water supply flow; the main water supply door instruction triggering module is used for generating a main water supply door opening and closing triggering instruction according to the result of the main water supply door opening and closing state judging module; automatic opening and closing of the main water supply door are achieved, intelligent control over the unit is improved, operation steps of operators are greatly reduced, operation is more standardized, misoperation in the starting process is reduced, meanwhile, the operation intensity of the operators is relieved, and safe and stable operation of the unit is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of intelligent control of gas generator sets, and particularly relates to a pressure maintaining automatic starting control system, method and equipment for a boiler medium pressure system of a gas generator set. BACKGROUND

[0002] The pressure maintaining of the boiler medium pressure system is a crucial step in the starting process of the gas generator set, involves many systems, and the operation of the equipment is relatively complex. In addition, some other unnecessary systems need to be isolated to avoid water entering other equipment and causing unnecessary trouble. The pressure maintaining of the boiler medium pressure system is a key step in the starting process of the boiler, and many blowdown valves, water drain valves and desuperheating water valves need to be isolated, which is relatively cumbersome to operate, especially in the stage of preparing to start the machine after maintenance. If one valve is not closed or is closed less, it may cause the pressure maintaining of the boiler medium pressure system to fail, affecting the normal starting progress. SUMMARY

[0003] The present application provides a pressure maintaining automatic starting control system, method and equipment for a boiler medium pressure system of a gas generator set, which solves the problems existing in the prior art. To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: The present application provides a pressure maintaining automatic starting control system for a boiler medium pressure system of a gas generator set, which comprises: An instruction triggering module is used to trigger the instruction of switching the main water supply path or the instruction of switching the bypass water supply path; A main water supply gate opening and closing state judgment module is used to judge the opening and closing state of the main water supply gate according to the difference between the water supply flow rate set value and the water supply flow rate, and the difference between the water supply flow rate and the time delay value of the water supply flow rate; A main water supply gate instruction triggering module is used to generate the main water supply gate opening and closing triggering instruction according to the result of the main water supply gate opening and closing state judgment module.

[0004] Preferably, the instruction triggering module comprises: A water supply main path triggering unit is used to control the running time of the on-off input water supply main path instruction after the triggering of the on-off input water supply main path instruction, and trigger the water supply main path once in the set time; A water supply bypass path triggering unit is used to control the running time of the on-off input water supply bypass path instruction after the triggering of the on-off input water supply bypass path instruction, and trigger the water supply bypass path once in the set time.

[0005] Preferably, the water supply cut-off main triggering unit comprises a first AND block, a first pulse block, a first NOT block and a first delay block, the first input end of the first AND block is a switch quantity input water supply cut-off main instruction, the output end of the first AND block is connected with the input end of the first pulse block; the output of the first pulse block is connected with the input end of the main water gate instruction triggering module and the input end of the first NOT block respectively, the output of the first NOT block is connected with the input of the first delay block, and the output of the first delay block is connected with the second input end of the first AND block.

[0006] Preferably, the water supply cut-off bypass triggering unit comprises a second AND block, a second pulse block, a second NOT block and a second delay block, the first input end of the second AND block is a switch quantity input water supply cut-off bypass instruction, the output end of the second AND block is connected with the input end of the second pulse block; the output of the second pulse block is connected with the input end of the main water gate instruction triggering module and the input end of the second NOT block respectively, the output of the second NOT block is connected with the input of the second delay block, and the output of the second delay block is connected with the second input end of the second AND block.

[0007] Preferably, the main water gate switch state judgment module comprises a water supply flow difference value size judgment unit, a water supply flow change amount size judgment unit, a second OR block and a third NOT block, wherein: the output of the water supply flow difference value size judgment unit is connected with the first input end of the second OR block; the output of the water supply flow change amount size judgment unit is connected with the second input end of the second OR block; the output end of the second OR block is connected with the input end of the third NOT block, and the output end of the third NOT block is connected with the main water gate instruction triggering module.

[0008] Preferably, the water supply flow difference value size judgment unit comprises a first subtraction block, a first maximum block, a first minimum block and a first OR block, wherein: the first input end of the first subtraction block is an analog quantity input water supply flow set value; the second input end of the first subtraction block is an analog quantity input water supply flow; the output end of the first subtraction block is connected with the input end of the first maximum block and the input end of the first minimum block respectively, the output end of the first maximum block and the output end of the first minimum block are connected with the first input end and the second input end of the first OR block respectively, and the output end of the first OR block is connected with the first input end of the second OR block.

[0009] Preferably, the water supply flow change amount size judgment unit comprises a second subtraction block, a second maximum block, a second minimum block and a third OR block, wherein: the first input end of the second subtraction block is an analog quantity input water supply flow; The second input end of the second subtraction block is connected with the output end of a delay block, and the input end of the delay block is connected with the analog input water flow; The output end of the second subtraction block is connected with the input end of a second maximum block and a second minimum block respectively, the output end of the second maximum block and the second minimum block is connected with the first input end and the second input end of a third OR block respectively, and the output end of the third OR block is connected with the second input end of a second OR block.

[0010] Preferably, the main water gate command triggering module comprises a third AND block, a fourth AND block, a third pulse block, a fourth pulse block, a fourth NOT block, a fifth NOT block, a fifth pulse block, a sixth pulse block and a fourth OR block, wherein: The first input end of the third AND block is connected with the output end of the water gate main path triggering unit in the command triggering module; The first input end of the fourth AND block is connected with the output end of the water gate bypass path triggering unit in the command triggering module; The output end of the third NOT block in the main water gate switch state judging module is connected with the second input end of the third AND block and the fourth AND block respectively; The output end of the third AND block is connected with the input end of the third pulse block and the fourth NOT block respectively; The output end of the fourth AND block is connected with the input end of the fourth pulse block and the fifth NOT block respectively; The third pulse block outputs a switch quantity to open the main water gate, and the fourth pulse block outputs a switch quantity to close the main water gate; The output end of the fourth NOT block is connected with the first input end of the fourth OR block through the fifth pulse block, and the output end of the fifth NOT block is connected with the second input end of the fourth OR block through the sixth pulse block; The fourth OR block outputs a switch quantity to stop the main water gate.

[0011] A pressure maintaining automatic starting control method for a medium pressure system of a gas turbine boiler, comprising the following steps: Analog input water flow set value, analog input water flow, switch input water gate main path triggering command and switch input water gate bypass path triggering command are obtained; The running time of the switch input water gate main path triggering command or the switch input water gate bypass path triggering command is controlled; The switch state of the main water gate is judged according to the difference between the analog input water flow set value and the analog input water flow, and the difference between the analog input water flow and the water flow delay value; According to the running time and the opening and closing state of the main feed water door, an interlocking opening main feed water door instruction or an interlocking closing main feed water door instruction is output, and when the interlocking opening main feed water door instruction or the interlocking closing main feed water door instruction is triggered, an interlocking stopping main feed water door instruction is triggered.

[0012] A computer device comprises: a processor adapted to execute a computer program; The processor implements the functions of the modules in the system when executing the computer program.

[0013] Compared with the prior art, the beneficial effects of the present application are: The pressure maintaining automatic starting control system for the middle pressure system of the gas unit boiler provided by the present application realizes the automatic opening and closing of the main feed water door, improves the intelligent control of the unit, greatly reduces the operation steps of the operating personnel, makes the operation more standardized, reduces the occurrence of misoperation in the starting process, simultaneously relieves the operation intensity of the operating personnel, and realizes the safe and stable operation of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the pressure maintaining mode process of the middle pressure system of the boiler; Figure 2 is an automatic control logic diagram of the whole pressure maintaining process of the middle pressure system of the boiler. DETAILED DESCRIPTION

[0015] In the following description, specific details are set forth such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the present embodiments. However, persons skilled in the art will understand that the present application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and methods have not been described in detail in order to avoid obscuring the present application.

[0016] It should be understood that the term "comprising" as used in the specification and in the following claims indicates the presence of the recited features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0017] It should also be understood that the term "and / or" as used in the specification and in the following claims indicates any combination of one or more of the associated listed items and all possible combinations thereof.

[0018] As used in the specification and the appended claims of the application, the term "if' can be interpreted as meaning "when" or "upon" or "in response to a determination" or "in response to a detection" depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted as meaning "upon determining" or "in response to a determining" or "upon detecting [a described condition or event]" or "in response to a detecting [a described condition or event]" depending on the context.

[0019] In addition, in the description of the application and the appended claims, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0020] In the present application, the reference "one embodiment" or "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized. Embodiment 1 Reference Figure 1 The present embodiment provides a gas turbine unit boiler medium pressure system pressure maintaining automatic starting control system, which sends boiler medium pressure system pressure maintaining control instructions to each device by using sequential control starting, to realize accurate control of the device. Mainly, the boiler medium pressure system pressure maintaining starting is started, and it is determined that the gas turbine speed is less than 45 Hz and the gas turbine is not ignited, to determine whether the operation before pressure maintaining is completed and whether the pressure maintaining condition is met. After determining the pressure maintaining condition, the boiler medium pressure system is selected to be in pressure maintaining state (manual button is put in) or not in pressure maintaining state (default mode), wherein: Selecting the default mode: not in pressure maintaining state, first, exit the medium pressure bypass, then the reheated desuperheating water valve is automatically adjusted, and then the medium pressure bypass is closed, and the reheated desuperheating water valve is automatically adjusted. Then, the water level is automatically adjusted to 0 mm. Then, the standby of the running pump is exited, the program control sends an instruction to stop the running pump, and finally, the water feeding valve is closed, and the drum liquid level is controlled between -10 mm and 10 mm.

[0021] The manual selection pressure maintaining mode is controlled automatically in sequence, first, the instruction of closing the medium pressure main steam pipeline valve is sent, after the feedback of closing the medium pressure main steam pipeline valve is detected, the reheating steam pipeline drain valve is opened, the water level in the steam drum is obtained, the automatic opening and closing of the main feed water valve is controlled through logical judgment, the water level in the steam drum is automatically adjusted to 200mm, the standby of the operation pump is exited, and the instruction of stopping the operation pump is sent. After the operation pump is stopped, the boiler medium pressure water supply valve is closed, and the water level in the steam drum is controlled between 190mm and 210mm. At this time, the automatic control of the whole process of the boiler medium pressure system pressure maintaining is ended.

[0022] Through the unit sequence control starting, the unit pressure maintaining equipment is started or opened through sending the control instruction, whether the next control instruction is sent is judged through the equipment feedback information, the equipment is precisely controlled, the water level in the steam drum is automatically adjusted through sending the various instruction control, the water inflow of the steam drum is judged according to the water level, and the valve opening degree is judged.

[0023] The embodiment provides a kind of gas unit in automatic starting process, and the whole process automatic control system of boiler medium pressure system pressure maintaining, comprising: Analog input: feed water flow set value, feed water flow; Switching quantity input: feed water cut main road, feed water cut bypass; Switching quantity output: interlock opening main feed water door, interlock closing main feed water door, interlock stopping main feed water door.

[0024] Switching quantity input feed water cut main road instruction and the first input end of first and block are connected;The output of first and block is connected with the input of first pulse block, the output of first pulse block is respectively connected with the first input end of third and block and the input of first non-block, the output of first non-block is connected with the input of first delay block, and the output of first delay block is connected with the second input end of first and block. To realize when switching quantity input feed water cut main road instruction triggers, the running time of switching quantity input feed water cut main road instruction is controlled by pulse signal, and the switching quantity input feed water cut main road instruction is triggered once in the set time, to prevent instruction from triggering frequently.

[0025] Switching quantity input feed water cut bypass instruction and the first input end of second and block are connected, the output of second and block is connected with the input of second pulse block, the output of second pulse block is respectively connected with the first input end of fourth and block and the input of second non-block, the output of second non-block is connected with the input of second delay block, and the output of second delay block is connected with the second input end of second and block. To realize when switching quantity input feed water cut bypass instruction triggers, the running time of switching quantity input feed water cut main road instruction is controlled by pulse signal, and the switching quantity input feed water cut main road instruction is triggered once in the set time, to prevent instruction from triggering frequently.

[0026] The analog input water flow set value is connected with the first input of the first subtraction block, and the analog input water flow is connected with the second input of the first subtraction block. The output of the first subtraction block is connected with the input of the first maximum block and the input of the first minimum block respectively. The output of the first maximum block is connected with the first input of the first OR block, and the output of the first minimum block is connected with the second input of the first OR block. The output of the first OR block is connected with the first input of the second OR block. The difference between the water flow set value and the water flow is determined, and the opening and closing state of the main water gate is determined, so that the flow is better controlled and more stable.

[0027] The analog input water flow is connected with the first input of the second subtraction block and the input of the delay block respectively. The output of the delay block is connected with the second input of the second subtraction block. The output of the second subtraction block is connected with the input of the second maximum block and the input of the second minimum block respectively. The output of the second maximum block is connected with the first input of the third OR block, and the output of the second minimum block is connected with the second input of the third OR block. The difference between the water flow and the delay value of the water flow is determined, and the change of the water flow is determined according to the difference, so that the opening and closing state of the main water gate is determined, and the flow is better controlled and more stable.

[0028] The output of the third OR block is connected with the second input of the second OR block. The output of the second OR block is connected with the input of the third NOT block. The output of the third NOT block is connected with the second input of the third AND block and the second input of the fourth AND block respectively. The output of the third AND block is connected with the input of the third pulse block and the input of the fourth NOT block respectively. The output of the fourth AND block is connected with the input of the fourth pulse block and the input of the fifth NOT block respectively.

[0029] The output of the third pulse block is connected with the switch output interlock to open the main water gate. The output of the fourth pulse block is connected with the switch output interlock to close the main water gate. The output of the fourth NOT block is connected with the input of the fifth pulse block. The output of the fifth pulse block is connected with the first input of the fourth OR block. The output of the fifth NOT block is connected with the input of the sixth pulse block. The output of the sixth pulse block is connected with the second input of the fourth OR block. The output of the fourth OR block is connected with the switch output interlock to stop the main water gate. The interlock to open the main water gate is triggered, and the interlock to close and stop the main water gate is avoided. The interlock to close the main water gate is triggered, and the interlock to close and stop the main water gate is avoided.

[0030] Through the logical judgment, the interlock to open the main water gate, the interlock to close the main water gate, and the interlock to stop the main water gate are obtained, and the automatic opening and closing of the main water gate is realized, and the intelligent control of the unit is improved.

[0031] The logical judgment is carried out through water supply switching main path, water supply switching bypass, water supply flow setting value, water supply flow, etc. The interlocking opening main water supply door, interlocking closing main water supply door, interlocking stopping main water supply door, etc. are obtained. The automatic opening and closing of the main water supply door is realized. The intelligent control of the unit is improved. The operation steps of the operation personnel are greatly reduced. The operation is more standardized. The misoperation in the starting process is reduced. Meanwhile, the operation intensity of the operation personnel is reduced. The safe and stable operation of the unit is realized.

[0032] Embodiment 2 The embodiment provides a pressure maintaining automatic starting control method for a medium-pressure system of a gas unit boiler. Analog quantity input water supply flow setting value, analog quantity input water supply flow, switching quantity input water supply switching main path proceeding instruction and switching quantity input water supply switching bypass proceeding instruction are acquired. The running time of the switching quantity input water supply switching main path proceeding instruction or the switching quantity input water supply switching main path proceeding instruction is controlled. The opening and closing state of the main water supply door is judged according to the difference between the analog quantity input water supply flow setting value and the analog quantity input water supply flow and the difference between the analog quantity input water supply flow and the water supply flow delay value. The interlocking opening main water supply door instruction or the interlocking closing main water supply door instruction is output according to the running time and the opening and closing state of the main water supply door. When the interlocking opening main water supply door instruction or the interlocking closing main water supply door instruction is triggered, the interlocking stopping main water supply door instruction is triggered.

[0033] Embodiment 3 The embodiment provides a computer device, which comprises a memory for storing a computer program and a processor for executing the computer program to realize the functions of various modules in the above system, such as comprising: An instruction triggering module is used to trigger according to the water supply switching main path proceeding instruction or the water supply switching bypass proceeding instruction. A main water supply door opening and closing state judging module is used to judge the opening and closing state of the main water supply door according to the difference between the water supply flow setting value and the water supply flow and the difference between the water supply flow and the water supply flow delay value. A main water supply door instruction triggering module is used to generate a main water supply door opening and closing triggering instruction according to the result of the main water supply door opening and closing state judging module.

[0034] The computer device can be a desktop computer, a notebook computer, a palm computer, a cloud server, and the like. The computer device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above are examples of the computer device, and do not constitute a limitation on the computer device, and the computer device can include more components, or combine certain components, or different components, for example, the computer device can also include an input / output device, a network access device, a bus, and the like.

[0035] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The processor is a control center of the computer device, and connects various parts of the computer device through various interfaces and lines.

[0036] The memory can be used to store the computer program and / or the module, and the processor realizes various functions of the computer device by running or executing the computer program and / or the module stored in the memory, and calling the data stored in the memory.

[0037] The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required for a function (such as a sound playing function, an image playing function, and the like), and the like; and the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, and the like), and the like. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0038] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A pressure maintaining automatic start control system for a gas turbine unit boiler pressure system, characterized in that, The application relates to a water supply control system, which comprises the following parts: an instruction triggering module for triggering an instruction of water supply main path or an instruction of water supply bypass path; a main water supply door opening and closing state judging module for judging the opening and closing state of the main water supply door according to the difference between a water supply flow setting value and a water supply flow and the difference between the water supply flow and a water supply flow time delay value; a main water supply door instruction triggering module for generating a main water supply door opening and closing triggering instruction according to the result of the main water supply door opening and closing state judging module.

2. The pressure maintaining automatic start-up control system for the medium pressure system of a gas turbine unit boiler according to claim 1, characterized in that, The instruction triggering module comprises: a water supply main path triggering unit for controlling the running time of the switch input water supply main path instruction after triggering the switch input water supply main path instruction and triggering the switch input water supply main path instruction once in a set time; a water supply bypass path triggering unit for controlling the running time of the switch input water supply bypass path instruction after triggering the switch input water supply bypass path instruction and triggering the switch input water supply bypass path instruction once in a set time.

3. The control system of claim 2, wherein the control system is configured to automatically start the gas-fired unit boiler when the pressure in the medium pressure system is less than the minimum pressure threshold. The water supply main path triggering unit comprises a first AND block, a first pulse block, a first NOT block and a first time delay block, the first input end of the first AND block is the switch input water supply main path instruction, the output end of the first AND block is connected with the input end of the first pulse block; the output of the first pulse block is connected with the input end of the main water supply door instruction triggering module and the input end of the first NOT block respectively, the output of the first NOT block is connected with the input end of the first time delay block, and the output of the first time delay block is connected with the second input end of the first AND block. ​ 4. The control system of claim 2, wherein, The water supply bypass path triggering unit comprises a second AND block, a second pulse block, a second NOT block and a second time delay block, the first input end of the second AND block is the switch input water supply bypass path instruction, the output end of the second AND block is connected with the input end of the second pulse block; the output of the second pulse block is connected with the input end of the main water supply door instruction triggering module and the input end of the second NOT block respectively, the output of the second NOT block is connected with the input end of the second time delay block, and the output of the second time delay block is connected with the second input end of the second AND block.

5. The control system of claim 1, wherein, The main water supply door opening and closing state judging module comprises a water supply flow difference value size judging unit, a water supply flow change amount size judging unit, a second OR block and a third NOT block, wherein: the output of the water supply flow difference value size judging unit is connected with the first input end of the second OR block; the output of the water supply flow change amount size judging unit is connected with the second input end of the second OR block; the output end of the second OR block is connected with the input end of the third NOT block, and the output end of the third NOT block is connected with the main water supply door instruction triggering module.

6. The control system of claim 5, wherein the control system is configured to automatically start the gas-fired unit boiler when the pressure in the medium pressure system is less than the minimum pressure threshold. The water supply flow difference value size judging unit comprises a first subtraction block, a first maximum block, a first minimum block and a first OR block, wherein: the first input end of the first subtraction block is the analog input water supply flow setting value; the second input end of the first subtraction block is the analog input water supply flow. The output end of the first subtraction block is connected to the input end of the first maximum block and the first minimum block, the output end of the first maximum block and the first minimum block is connected to the first input end and the second input end of the first OR block, and the output end of the first OR block is connected to the first input end of the second OR block.

7. The control system of claim 5, wherein the control system is configured to automatically start the gas-fired unit boiler when the pressure in the medium pressure system is less than the minimum pressure threshold. The feed water flow variation size judging unit comprises a second subtraction block, a second maximum block, a second minimum block and a third OR block, wherein: ​ The first input end of the second subtraction block is an analog input feed water flow; The second input end of the second subtraction block is connected to the output end of a delay block, and the input end of the delay block is an analog input feed water flow; The output end of the second subtraction block is connected to the input end of the second maximum block and the second minimum block, the output end of the second maximum block and the second minimum block is connected to the first input end and the second input end of the third OR block, and the output end of the third OR block is connected to the second input end of the second OR block.

8. The control system of claim 1, wherein, The main feed water gate instruction triggering module comprises a third AND block, a fourth AND block, a third pulse block, a fourth pulse block, a fourth NOT block, a fifth NOT block, a fifth pulse block, a sixth pulse block and a fourth OR block, wherein: The first input end of the third AND block is connected to the output end of the feed water main path conducting triggering unit in the instruction triggering module; The first input end of the fourth AND block is connected to the output end of the feed water bypass conducting triggering unit in the instruction triggering module; The output end of the third NOT block in the main feed water gate switch state judging module is connected to the second input end of the third AND block and the fourth AND block; The output end of the third AND block is connected to the input end of the third pulse block and the fourth NOT block; The output end of the fourth AND block is connected to the input end of the fourth pulse block and the fifth NOT block; The third pulse block outputs a switch quantity to open the main feed water gate, and the fourth pulse block outputs a switch quantity to close the main feed water gate; The output end of the fourth NOT block is connected to the first input end of the fourth OR block through the fifth pulse block, and the output end of the fifth NOT block is connected to the second input end of the fourth OR block through the sixth pulse block; The fourth OR block outputs a switch quantity to stop the main feed water gate.

9. A method for automatic pressure maintenance and start-up control of a gas turbine unit boiler pressure system, characterized by, The method comprises the following steps: Acquiring an analog input feed water flow set value, an analog input feed water flow, a switch quantity input feed water main path conducting instruction and a switch quantity input feed water bypass conducting instruction; Controlling the switch quantity input feed water main path conducting instruction or the switch quantity input feed water main path conducting instruction running time; Judging the switch state of the main feed water gate according to the difference between the analog input feed water flow set value and the analog input feed water flow, and according to the difference between the analog input feed water flow and the feed water flow delay value; Outputting an interlock open main feed water gate instruction or an interlock close main feed water gate instruction according to the running time and the switch state of the main feed water gate, and triggering an interlock stop main feed water gate instruction when triggering the interlock open main feed water gate instruction or the interlock close main feed water gate instruction.

10. A computer device, comprising: The system comprises: A processor adapted to execute a computer program; The processor executes the computer program to realize the functions of the modules in the system according to any one of claims 1-8.

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