CN115451342A - Nitrogen charging protection method, device and system for power equipment of thermal power plant - Google Patents

Nitrogen charging protection method, device and system for power equipment of thermal power plant Download PDF

Info

Publication number
CN115451342A
CN115451342A CN202211240037.2A CN202211240037A CN115451342A CN 115451342 A CN115451342 A CN 115451342A CN 202211240037 A CN202211240037 A CN 202211240037A CN 115451342 A CN115451342 A CN 115451342A
Authority
CN
China
Prior art keywords
nitrogen
power equipment
purity
supplementing
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211240037.2A
Other languages
Chinese (zh)
Inventor
李良
马欣欣
于洋
周洋
马明强
刘青华
杨磊
袁明明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huadian Electric Power Research Institute Co Ltd
Original Assignee
Huadian Electric Power Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huadian Electric Power Research Institute Co Ltd filed Critical Huadian Electric Power Research Institute Co Ltd
Priority to CN202211240037.2A priority Critical patent/CN115451342A/en
Publication of CN115451342A publication Critical patent/CN115451342A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product

Abstract

The invention provides a nitrogen charging protection method, a nitrogen charging protection device and a nitrogen charging protection system for power equipment of a thermal power plant, wherein the nitrogen charging protection method for the power equipment of the thermal power plant comprises the following steps: monitoring the running state of each power device; when the running state of the first power equipment is monitored to be shutdown, controlling a nitrogen supplementing device to supplement nitrogen to the first power equipment; monitoring the current nitrogen purity at the outlet end of the first power equipment; judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value; and when the current nitrogen purity reaches a preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment. The power equipment is protected by filling nitrogen in the first time of stopping the power equipment, corrosion and scaling of the power equipment caused by long stopping time are avoided, safe and stable operation of the power equipment is guaranteed, and when the first power equipment is protected by fully preventing corrosion, nitrogen waste is avoided, and the power equipment is more environment-friendly.

Description

Nitrogen charging protection method, device and system for power equipment of thermal power plant
Technical Field
The invention relates to the field of power systems, in particular to a nitrogen charging protection method, a nitrogen charging protection device and a nitrogen charging protection system for power equipment of a thermal power plant.
Background
A new power system mainly based on new energy is rapidly formed, the number of hours of utilization of a thermal power unit is continuously reduced, the standby time is continuously increased, and the standby frequency of the thermal power unit is higher and higher, for example, in the period from 2018 to 2021, the average standby days are 72 days, 107 days, 115 days and 114 days when the unit with the single capacity of less than 300MW of a Shandong power grid is used, and how to effectively perform standby protection when the unit is used for irregular and long-term standby service has been a serious challenge. In recent years, because the corrosion leakage of a boiler and a high-pressure heater and the corrosion and blockage of a generator wire bar caused by improper protection for stopping (standby) sometimes occur, how to avoid the corrosion and scaling of equipment caused by poor shutdown protection on the basis of meeting the requirement of quick shutdown protection of a unit becomes a problem to be solved urgently at present.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of overcoming the defects that the prior art cannot meet the requirement of quick shutdown protection of a unit, so that equipment corrosion and scaling are caused due to poor shutdown protection, and the safe and stable operation of the unit is influenced, thereby providing the method, the device and the system for protecting the power equipment of the thermal power plant by charging nitrogen.
According to a first aspect, an embodiment of the present invention provides a method for protecting nitrogen charging of power equipment of a thermal power plant, where the thermal power plant includes several power equipment, and the method includes:
monitoring the running state of each power device;
when the running state of the first power equipment is monitored to be shutdown, controlling a nitrogen supplementing device to supplement nitrogen to the first power equipment;
monitoring the current nitrogen purity at the outlet end of the first power equipment;
judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value;
and when the current nitrogen purity reaches the preset nitrogen purity threshold, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment.
Optionally, before controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power plant, the method further comprises:
monitoring a current nitrogen pressure in the first power plant;
judging whether the current nitrogen pressure reaches a preset nitrogen pressure threshold value;
and when the current nitrogen pressure measured value reaches the preset nitrogen pressure threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment.
Optionally, the method further comprises:
and when the current nitrogen pressure measured value is not less than the preset nitrogen pressure threshold value and the nitrogen purity measured value is not less than the preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment, and returning to the step of monitoring the running state of each power equipment.
According to a second aspect, an embodiment of the present invention provides a nitrogen charging protection device for power equipment of a thermal power plant, where the thermal power plant includes several power equipment, and the device includes:
the first monitoring module is used for monitoring the running state of each power device;
the first processing module is used for controlling the nitrogen supplementing device to supplement nitrogen to the first power equipment when the running state of the first power equipment is monitored to be shutdown;
the second monitoring module is used for monitoring the current nitrogen purity at the outlet end of the first power equipment;
the judging module is used for judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value;
and the second processing module is used for controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment when the current nitrogen purity reaches the preset nitrogen purity threshold value.
According to a third aspect, an embodiment of the present invention provides a thermal power plant nitrogen charging protection system, where the thermal power plant includes a plurality of power devices, and the thermal power plant nitrogen charging protection system includes: a nitrogen supplementing device, a nitrogen charging control cabinet and a nitrogen purity monitoring device which is arranged in one-to-one correspondence with the power equipment, wherein,
the output end of the nitrogen supplementing device is respectively connected with each power device;
the nitrogen purity monitoring device is connected with a first input end of the nitrogen charging control cabinet and is used for acquiring the current nitrogen purity in the corresponding power equipment and sending the current nitrogen purity to the nitrogen charging control cabinet;
the nitrogen charging control cabinet comprises a memory and a processor, wherein the memory and the processor are communicatively connected with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method of the first aspect or any optional implementation manner of the first aspect.
Optionally, the thermal power plant power equipment nitrogen charging protection system further comprises: nitrogen conveying pipelines which are arranged in one-to-one correspondence with the power equipment,
one end of the nitrogen conveying pipeline is connected with the nitrogen supplementing device, the other end of the nitrogen conveying pipeline is connected with the corresponding power equipment, and a control valve is arranged on the nitrogen conveying pipeline and connected with the nitrogen charging control cabinet.
Optionally, the thermal power plant power equipment nitrogen charging protection system further comprises: nitrogen pressure monitoring devices which are in one-to-one correspondence with the power equipment,
the nitrogen pressure monitoring device is arranged at a nitrogen inlet of the corresponding power equipment;
the nitrogen pressure monitoring device is connected with a second input end of the nitrogen charging control cabinet and is suitable for monitoring the current nitrogen pressure at a nitrogen inlet of the power equipment and feeding the current nitrogen pressure back to the nitrogen charging control cabinet.
Optionally, the thermal power plant power equipment nitrogen charging protection system further comprises: a nitrogen injection pump, a nitrogen supplement regulating valve and a nitrogen supplement inlet valve, wherein,
the input end of the nitrogen injection pump is connected with the output end of the nitrogen supplementing device, and the output end of the nitrogen injection pump is connected with the input end of the nitrogen supplementing regulating valve;
the control end of the nitrogen supplementing regulating valve is connected with the output end of the nitrogen supplementing control cabinet, and the output end of the nitrogen supplementing regulating valve is connected with the input end of the nitrogen supplementing inlet valve;
and the output end of the nitrogen supplementing inlet valve is respectively connected with the input end of the control valve of each power device.
Optionally, the power plant is a drum boiler, and/or a high/low pressure heater, and/or a cold water system in a generator.
Optionally, the thermal power plant power equipment nitrogen charging protection system further comprises: a nitrogen purification device and nitrogen discharge valves which are arranged in one-to-one correspondence with each power device, wherein,
the outlet end of the nitrogen purification device is connected with the input end of the nitrogen storage tank and is suitable for supplementing the purified nitrogen into the nitrogen storage tank;
the input end of each nitrogen discharge valve is respectively connected with the output end of the corresponding power equipment, and the output end of each nitrogen discharge valve is respectively connected with the input end of the corresponding nitrogen purity monitoring device.
According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the method of the first aspect, or any one of the optional implementation manners of the first aspect.
The technical scheme of the invention has the following advantages:
the invention provides a nitrogen charging protection method and a nitrogen charging protection device for power equipment of a thermal power plant, wherein the operating state of each power equipment is monitored; when the running state of the first power equipment is monitored to be stopped, controlling a nitrogen supplementing device to supplement nitrogen to the first power equipment; monitoring the current nitrogen purity at the outlet end of the first power equipment; judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value; and when the current nitrogen purity reaches the preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment. By monitoring the running state of each power device, when the first power device is in a shutdown state, the first power device is protected by nitrogen charging in time, and the power device is protected by nitrogen charging in the first time when the power device is shutdown, so that corrosion and scaling of the power device caused by long shutdown time are avoided, and the safe and stable running of the power device is ensured; through monitoring the nitrogen purity of first power equipment exit end, when current nitrogen purity reaches and predetermines nitrogen purity threshold value, control nitrogen gas filling device stops to supply nitrogen gas to first power equipment, when carrying out abundant anticorrosion protection to first power equipment, avoids nitrogen gas extravagant, has more the feature of environmental protection.
According to the nitrogen charging protection system for the power equipment of the thermal power plant, provided by the invention, the nitrogen charging protection can be carried out on the power equipment at the first time of shutdown by arranging the nitrogen supplementing device, the nitrogen control cabinet and the nitrogen purity monitoring devices which are arranged in one-to-one correspondence with the power equipment, so that the problems of equipment corrosion, scaling and the like caused by longer shutdown time of the power equipment are avoided, the current nitrogen purity of the power equipment is monitored by the nitrogen purity monitoring devices, the nitrogen supplementing condition is mastered in real time, and by matching with the nitrogen charging control cabinet, the waste of nitrogen is avoided while the first power equipment is subjected to full corrosion protection, and the nitrogen charging protection system is more environment-friendly.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, provided by the invention, the nitrogen conveying pipelines which correspond to the power equipment one by one are arranged, so that the nitrogen can be conveyed to each power equipment through the nitrogen conveying pipelines, and the corrosion protection is provided for the power equipment in a shutdown state; through set up the control valve on nitrogen gas conveying pipeline, be connected it with filling the nitrogen switch board, according to the transport of the control signal control nitrogen gas that fills the nitrogen switch board, when reaching to fill nitrogen anticorrosion protection effect to power equipment, further improve the precision of anticorrosion protection, realize accurate nitrogen protection of filling.
According to the nitrogen charging protection system for the power equipment of the thermal power plant, the nitrogen pressure monitoring devices which correspond to the power equipment one by one are arranged, the current nitrogen pressure at the nitrogen inlet of the power equipment is monitored, data are fed back to the nitrogen charging control cabinet, the current nitrogen pressure in the power equipment is monitored in real time, the current nitrogen pressure of the power equipment is accurately controlled, meanwhile, the nitrogen pressure in the power equipment is further ensured to meet the anti-corrosion protection requirement for a long time, and accurate nitrogen charging protection is realized.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, provided by the invention, nitrogen is quickly supplemented into the power equipment by the nitrogen injection pump without excessive manual operation, so that the nitrogen supplementing time is greatly shortened, the working efficiency is improved, and the nitrogen protection effect is further enhanced; through setting up the nitrogen supplementation governing valve and supplementing nitrogen inlet valve, the nitrogen gas governing valve with fill the nitrogen switch board and be connected, be convenient for fill break-make and flow control of nitrogen protection according to the control signal control that fills the nitrogen switch board and send, can automatic start carry out the nitrogen gas replenishment behind the set pressure in power equipment nitrogen gas leakage, supply to automatic shutdown behind the set pressure value, on the basis of at utmost reduction manual operation, realize the accurate control of the nitrogen protection that fills to power equipment.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, the nitrogen purity is ensured to meet the requirement of corrosion protection by arranging the nitrogen purification device; through setting up the nitrogen discharge valve that sets up with each power equipment one-to-one, guarantee that thermal power plant's power equipment fills nitrogen pressure in the protection system and satisfies the anticorrosion protection requirement, guarantee power equipment's safe and stable operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic overall system flow diagram of a thermal power plant power equipment nitrogen charging protection system according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a nitrogen-charging control cabinet according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a system for protecting a drum boiler from nitrogen charge in accordance with an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a system for nitrogen charge protection of the high/low pressure heater according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a system for protecting a cooling water system in a generator by nitrogen charging according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for nitrogen protection of a thermal power plant in accordance with an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a nitrogen charging protection device for power equipment of a thermal power plant according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be connected through the inside of the two elements, or may be connected wirelessly or through a wire. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a nitrogen charging protection system for power equipment of a thermal power plant, wherein the thermal power plant comprises a plurality of power equipment 20, as shown in fig. 1, the nitrogen charging protection system for the power equipment of the thermal power plant comprises:
a nitrogen supplementing device 1, a nitrogen charging control cabinet (not shown in the figure) and a nitrogen purity monitoring device 30 which is arranged corresponding to the power equipment 20 one by one, wherein,
the output end of the nitrogen supplementing device 1 is respectively connected with each power device 20;
the nitrogen purity monitoring device 30 is connected with a first input end of the nitrogen charging control cabinet, and is used for acquiring the current nitrogen purity in the power equipment 20 corresponding to the nitrogen charging monitoring device and sending the current nitrogen purity to the nitrogen charging control cabinet;
the nitrogen charging control cabinet comprises a storage 902 and a processor 901, as shown in fig. 2, the nitrogen charging control cabinet comprises the processor 901 and the storage 902, and the storage 902 and the processor 901 are communicatively connected with each other, wherein the processor 901 and the storage 902 may be connected by a bus or by other means, and fig. 2 illustrates the connection by the bus.
Processor 901 may be a Central Processing Unit (CPU). The Processor 901 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 902, which is a non-transitory computer readable storage medium, may be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the methods of the embodiments of the present invention. The processor 901 executes various functional applications and data processing of the processor 901 by executing non-transitory software programs, instructions and modules stored in the memory 902, i.e., implements the methods in the method embodiments described below.
The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 901, and the like. Further, the memory 902 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 902 may optionally include memory located remotely from the processor 901, which may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 902 and when executed by the processor 901 perform the methods in the method embodiments described below.
In particular, in practical application, the nitrogen charging control cabinet is also suitable for converting the acquired nitrogen purity signal into a standard universal 4-20 mA signal.
Specifically, after the nitrogen charging control cabinet receives an output signal of the nitrogen purity monitoring device, the output signal is compared with a standard setting signal, and a control signal is obtained through calculation according to a control algorithm and is output.
Illustratively, the nitrogen purity monitoring device 30 may be a nitrogen purity analyzer; the control algorithm may be PID control, but the actual situation is not limited thereto.
The specific details of the above-mentioned nitrogen-filling control cabinet can be understood by referring to the corresponding related descriptions and effects in the following method embodiments, which are not described herein again.
In particular, in practical application, the nitrogen supplementing device 1 (i.e. the nitrogen generating device) can be a nitrogen separating device, so that high-purity nitrogen can be continuously provided for a protected system through the nitrogen supplementing device 1 without replacing a nitrogen bottle; after the power equipment 20 is shut down, nitrogen can be injected into the system quickly, excessive manual operation is not needed, and the protection effect is further enhanced while the corrosion protection efficiency is improved.
Specifically, in order to better control the nitrogen gas supplementing device 1, in the embodiment of the present invention, a connecting valve 2 may be further disposed at an outlet of the nitrogen gas separating device, and the nitrogen gas supplementing device 1 and each power device 20 are connected and disconnected through the connecting valve 2.
Specifically, in one embodiment, the power plant 20 in the thermal power plant nitrogen charging protection system provided by the embodiment of the invention can be a drum boiler, and/or a high/low pressure heater, and/or a cold water system in a generator.
Specifically, in practical applications, as shown in fig. 1, the nitrogen purity monitoring devices 30 disposed in one-to-one correspondence with the power plant 20 are a boiler system nitrogen purity monitoring device 50, a high pressure addition/low pressure addition system nitrogen purity monitoring device 54, and a generator internal cooling water system nitrogen purity monitoring device 58, respectively, where the boiler system nitrogen purity monitoring device 50 is disposed between the boiler system exhaust primary valve 47 and the boiler system exhaust secondary valve 48; the nitrogen purity monitoring device 54 of the high pressure feed/low pressure feed system is arranged between the exhaust primary valve 51 of the high pressure feed/low pressure feed system and the exhaust secondary valve 52 of the high pressure feed/low pressure feed system; the device 58 for monitoring the purity of the nitrogen in the cold water system in the generator is arranged between the primary exhaust valve 55 of the cold water system in the generator and the secondary exhaust valve 56 of the cold water system in the generator.
Specifically, in practical application, on the basis of fully considering the actual situation of the thermal power plant, the embodiment of the invention provides a nitrogen charging protection system for power equipment of the thermal power plant, which not only can timely charge nitrogen for protection when the power equipment 20 needs to be protected, but also can monitor the purity and pressure of the nitrogen in real time, realize automatic nitrogen charging according to set parameters, and can simultaneously or respectively perform nitrogen charging anti-corrosion protection on a plurality of power equipment 20, so that the requirement for quick start of a unit of the thermal power plant is not influenced while the nitrogen charging protection effect is achieved, the utilization efficiency of the existing equipment of the thermal power plant is further improved, and the production cost is greatly reduced.
According to the nitrogen charging protection system for the power equipment of the thermal power plant, the nitrogen charging protection can be performed on the power equipment 20 at the first time when the power equipment 20 stops by arranging the nitrogen supplementing device 1, the nitrogen control cabinet and the nitrogen purity monitoring devices 30 which are arranged in one-to-one correspondence with the power equipment 20, the problems of equipment corrosion, scaling and the like caused by long stop time of the power equipment 20 are avoided, the current nitrogen purity of the power equipment 20 is monitored by the nitrogen purity monitoring devices 30, the nitrogen supplementing condition is mastered in real time, and by matching with the nitrogen charging control cabinet, the nitrogen waste is avoided while the first power equipment 20 is subjected to full corrosion protection, and the nitrogen charging protection system is more environment-friendly.
Specifically, in an embodiment, as shown in fig. 1, a nitrogen charging protection system for power equipment of a thermal power plant according to an embodiment of the present invention further includes: nitrogen gas delivery lines 100 provided in one-to-one correspondence with the power plant 20,
one end of the nitrogen conveying pipeline 100 is connected with the nitrogen supplementing device 1, the other end of the nitrogen conveying pipeline is connected with the corresponding power equipment 20, a control valve 40 is arranged on the nitrogen conveying pipeline 100, and the control valve 40 is connected with the nitrogen charging control cabinet. Through setting up the nitrogen gas conveying pipeline 100 that sets up with power equipment 20 one-to-one, can realize that one set of nitrogen gas make-up equipment can pour into nitrogen gas into to a plurality of power equipment 20 simultaneously or alone, has improved the utilization ratio of equipment.
Specifically, in practical applications, the control valve 40 is a nitrogen supplement valve, and the control valve 40 is a boiler system nitrogen supplement valve 41, a high pressure addition/low pressure addition system nitrogen supplement valve 42, and a generator internal cooling water system nitrogen supplement valve 43, respectively, according to the difference of the power plant 20.
Specifically, in practical applications, the embodiment of the present invention may implement the start and stop of the nitrogen charging for the power equipment 20 by controlling the opening and closing of the control valves 40 disposed on one-to-one basis with the power equipment 20, and further implement the controllability of the corrosion protection for the power equipment 20 while no manual operation is required.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, provided by the invention, the nitrogen conveying pipelines 100 which correspond to the power equipment 20 one by one are arranged, so that nitrogen can be conveyed to each power equipment 20 through the nitrogen conveying pipelines 100, and thus, the corrosion protection is provided for the power equipment 20 in a shutdown state; through set up control valve 40 on nitrogen gas conveying pipeline 100, be connected it with filling the nitrogen switch board, according to filling the transport of the control signal control nitrogen gas of nitrogen switch board, when reaching to fill nitrogen anticorrosion protection effect to power equipment 20, further improve anticorrosion protection's precision, realize accurate nitrogen protection of filling.
Specifically, in an embodiment, as shown in fig. 1, a thermal power plant power equipment nitrogen charging protection system provided by an embodiment of the present invention further includes: nitrogen pressure monitoring devices 60 in one-to-one correspondence with the power plant 20,
the nitrogen pressure monitoring device 60 is arranged at the nitrogen inlet of the power equipment 20 corresponding to the nitrogen pressure monitoring device;
the nitrogen pressure monitoring device 60 is connected to the second input end of the nitrogen charging control cabinet, and is adapted to monitor the current nitrogen pressure at the nitrogen inlet of the power equipment 20 and feed the current nitrogen pressure back to the nitrogen charging control cabinet.
Specifically, in practical application, the current nitrogen pressure at the nitrogen inlet of the power equipment 20 is monitored in real time, nitrogen in the power equipment 20 can be automatically started to be supplemented after being leaked to the set pressure, and the nitrogen can be automatically stopped to be supplemented after being supplemented to the set pressure value corresponding to the power equipment 20, so that the nitrogen pressure in the system can be ensured to improve the protection effect for a long time.
Specifically, in practical applications, the nitrogen pressure monitoring devices 60 corresponding to the power equipment 20 one to one are the boiler system nitrogen pressure monitoring device 44, the high pressure adding/low pressure adding system nitrogen pressure monitoring device 45, and the generator internal cooling water system nitrogen pressure monitoring device 46, respectively.
Specifically, in practical application, the embodiment of the present invention further provides a total nitrogen pressure monitoring device 9 at the output end of the nitrogen supply regulating valve 8, for monitoring the nitrogen pressure in the nitrogen conveying pipeline 100.
Specifically, in practical application, the nitrogen charging control cabinet can convert the acquired nitrogen pressure signal into a standard universal 4-20 mA signal, and the standard universal 4-20 mA signal is compared with a standard set signal, and a control signal is obtained through calculation according to a control algorithm and is output.
Illustratively, the total nitrogen pressure monitoring device 9, the nitrogen pressure monitoring device 60 may be a nitrogen pressure analyzer; the control algorithm may be PID control, but the actual situation is not limited thereto.
According to the nitrogen charging protection system for the power equipment of the thermal power plant, the nitrogen pressure monitoring devices 60 which correspond to the power equipment 20 one by one are arranged, the current nitrogen pressure at the nitrogen inlet of the power equipment 20 is monitored, data are fed back to the nitrogen charging control cabinet, the current nitrogen pressure in the power equipment 20 is monitored in real time, the current nitrogen pressure of the power equipment 20 is accurately controlled, meanwhile, the nitrogen pressure in the power equipment 20 meets the anti-corrosion protection requirement for a long time, and accurate nitrogen charging protection is achieved.
Specifically, in an embodiment, as shown in fig. 1, a thermal power plant power equipment nitrogen charging protection system provided by an embodiment of the present invention further includes: a nitrogen injection pump 6, a nitrogen supplement regulating valve 8 and a nitrogen supplement inlet valve 10, wherein,
the input end of the nitrogen injection pump 6 is connected with the output end of the nitrogen supplementing device 1, and the output end of the nitrogen injection pump is connected with the input end of the nitrogen supplementing regulating valve 8;
the control end of the nitrogen supplement regulating valve 8 is connected with the output end of the nitrogen supplement control cabinet, and the output end of the nitrogen supplement regulating valve is connected with the input end of a nitrogen supplement inlet valve 10;
the output end of the nitrogen supplement inlet valve 10 is respectively connected with the input ends of control valves (namely, a boiler system nitrogen supplement valve 41, a high pressure addition/low pressure addition system nitrogen supplement valve 42 and a generator internal cooling water system nitrogen supplement valve 43) of each power device 20.
Specifically, in practical application, the embodiment of the invention provides power assistance by the nitrogen injection pump 6, so that nitrogen is quickly supplemented to the power equipment 20, and the nitrogen filling protection efficiency is further improved.
Specifically, in practical applications, in order to avoid the nitrogen injection pump 6 from generating excessive pressure impact on the nitrogen conveying pipeline 100, in the embodiment of the present invention, the pressure reducing valve 7 is disposed between the nitrogen injection pump 6 and the nitrogen supplement regulating valve 8, so as to effectively regulate the pressure of the nitrogen entering the nitrogen conveying pipeline 100.
Specifically, in practical application, the output end of the nitrogen supplement inlet valve 10 according to the embodiment of the present invention is respectively connected to the input ends of the control valves 40 of the power equipment 20, and when the nitrogen supplement inlet valve 10 and the control valve 40 corresponding to the power equipment 20 are simultaneously in an open state, the nitrogen-charging anti-corrosion control of the power equipment 20 can be realized, excessive manual operation is not required, the nitrogen-charging protection work efficiency is further improved while the nitrogen-charging protection of the power equipment 20 is realized, and the anti-corrosion protection effect is enhanced.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, nitrogen is quickly supplemented into the power equipment 20 through the nitrogen injection pump 6, excessive manual operation is not needed, the nitrogen supplementing time is greatly shortened, and the nitrogen protection effect is further enhanced while the working efficiency is improved; through setting up benefit nitrogen governing valve 8 and benefit nitrogen inlet valve 10, benefit nitrogen governing valve 8 with fill the nitrogen switch board and be connected, be convenient for fill break-make and flow control of nitrogen protection according to the control signal control that fills the nitrogen switch board and send, can automatic start carry out the nitrogen gas replenishment behind the set pressure in power equipment 20 nitrogen gas leakage, supply to automatic shutdown behind the set pressure value, on the basis of at utmost reduction manual operation, realize filling nitrogen protection accurate control to power equipment 20.
Specifically, in an embodiment, as shown in fig. 1, a thermal power plant power equipment nitrogen charging protection system provided by an embodiment of the present invention further includes: the nitrogen gas purification device 3 and the nitrogen discharge valves 70 provided in one-to-one correspondence with the respective power units 20, wherein,
the outlet end of the nitrogen purification device 3 is connected with the input end of the nitrogen storage tank 4 and is suitable for supplementing purified nitrogen into the nitrogen storage tank 4;
the input end of each nitrogen discharge valve 70 is connected with the output end of the corresponding power equipment 20, and the output end thereof is connected with the input end of the corresponding nitrogen purity monitoring device 30.
Specifically, in practical application, in order to ensure the working efficiency of nitrogen charging protection, the embodiment of the invention further provides a nitrogen purification device 3 at the output end of the nitrogen supplementing device 1, and the nitrogen purity is ensured to meet the actual production requirement by purifying the nitrogen generated by the nitrogen supplementing device 1.
Specifically, in practical applications, the nitrogen discharge valves 70 provided in one-to-one correspondence with the power plants 20 are the boiler system nitrogen discharge valve 49, the high addition/low addition system nitrogen discharge valve 53, and the generator internal cooling water system nitrogen discharge valve 57, respectively.
Specifically, in practical applications, in order to ensure the safety of nitrogen storage, the embodiment of the present invention further provides a safety valve 5 at the outlet end of the nitrogen storage tank 4.
Specifically, in practical application, after the nitrogen discharge valve is opened, the embodiment of the present invention performs nitrogen gas supplement on each power plant 20, and as the corresponding power plant 20 is filled with nitrogen gas, as the power plant 20 is filled with nitrogen gas, the nitrogen gas is discharged into the atmosphere from the nitrogen gas conveying pipeline 100 where the nitrogen discharge valve 70 is located, and the nitrogen gas purity monitoring device 30 installed therein can perform purity monitoring, and after the purity reaches the corresponding preset nitrogen gas purity threshold, the corresponding nitrogen discharge valve 70 can be closed. Illustratively, the nitrogen bleed valve 70 may be a valve with remote control and shut-off functions, and a check valve is not required.
According to the nitrogen filling protection system for the power equipment of the thermal power plant, the nitrogen purity is ensured to meet the requirement of corrosion protection by arranging the nitrogen purification device 3; by arranging the nitrogen discharge valves 70 which are in one-to-one correspondence with the power equipment 20, the nitrogen pressure in the nitrogen charging protection system of the power equipment of the thermal power plant is ensured to meet the requirement of corrosion protection, and the safe and stable operation of the power equipment 20 is ensured.
Specifically, in an embodiment, as shown in fig. 3, the embodiment of the present invention may perform nitrogen charging protection on a drum boiler, and a main device of a nitrogen-adding anti-corrosion protection device of the drum boiler may be arranged on a side of a boiler room 300 or in a steam room 200, where a boiler heating surface 13, a drum 14 and a superheater 19 are arranged in the boiler room. After the nitrogen is generated by the nitrogen supplementing device 1, the nitrogen flows through the connecting valve 2, the nitrogen purifying device 3 and the nitrogen storage tank 4 in sequence, and enters a pipeline between a boiler blow-off primary valve 12 (namely a primary valve of a header blow-off header pipe under a water-cooled wall of the drum boiler) and a boiler blow-off secondary valve 11 (namely a secondary valve of the header blow-off header pipe under the water-cooled wall of the drum boiler) through a stainless steel pipeline with the inner diameter not smaller than 20mm, and the position of the pipeline is used as a nitrogen supplementing port of the drum boiler.
Wherein, the stainless steel pipeline is sequentially provided with a nitrogen injection pump 6, a pressure reducing valve 7, a nitrogen supplement regulating valve 8, a nitrogen pressure monitoring device and a nitrogen supplement inlet valve 10; the main blowdown pipe is provided with a primary boiler blowdown valve 12 and a secondary boiler blowdown valve 11, and when the drum boiler is in a working state, the primary boiler blowdown valve 12 and the secondary boiler blowdown valve 11 can be switched on and off to perform blowdown treatment on the drum boiler.
The pipeline trompil connecting tube between steam pocket exhaust primary valve 15 (being steam pocket top steam extraction pipe secondary) and steam pocket exhaust primary valve 15 (being steam pocket top steam extraction pipe secondary), this position will be as water-cooling wall system nitrogen gas purity monitoring mouth, through install steam pocket top nitrogen discharging valve 18 (exemplarily, can be electronic stop valve) and first nitrogen gas purity monitoring devices 17 additional on this pipeline, monitor the nitrogen gas purity of 14 exit of steam pocket, wherein, through being provided with steam pocket exhaust primary valve 15 and steam pocket exhaust secondary valve 16, when the steam pocket boiler is in operating condition, accessible break-make steam pocket exhaust primary valve 15 and steam pocket exhaust secondary valve 16 carry out the exhaust of steam pocket boiler and handle.
Pipeline trompil connecting tube between superheater steam exhaust primary valve 110 (be superheater top steam exhaust pipe primary door promptly) and superheater steam exhaust secondary valve 111 (be superheater top steam exhaust pipe secondary door promptly), this position is as superheater 19's nitrogen gas purity monitoring mouth, through install superheater nitrogen exhaust valve 113 and second nitrogen gas purity monitoring devices 112 additional on this pipeline, monitors the nitrogen gas purity of superheater 19 exit. Wherein, through being provided with over heater exhaust steam primary valve 110 and over heater exhaust steam secondary valve 111, when over heater 19 was in operating condition, accessible break-make over heater exhaust steam primary valve 110 and over heater exhaust steam secondary valve 111 carried out over heater's exhaust treatment.
Specifically, in practical application, the nitrogen charging protection working flow of the steam drum boiler in the embodiment of the invention is as follows:
after the unit is shut down, the boiler system waste heat in the boiler room 300 is drained completely, the nitrogen adding condition is provided, a boiler blowdown primary valve 12 (namely a primary valve of a blowdown header pipe of a lower header of a boiler water wall), the top of a steam pocket 14 and a superheater steam exhaust primary valve 110 (namely a primary valve of a superheater system exhaust pipe) are opened, a nitrogen supplementing device 1 is started to inject nitrogen into each power device 20, the purity of the nitrogen in a protected system is higher than 98% when nitrogen filling protection is required according to DLT/956-2017 thermal power plant stop (standby) thermal rust-proof equipment corrosion guide rules, the nitrogen pressure is maintained at 0.03MPa-0.05MPa, and when the nitrogen purity monitored by nitrogen purchasers corresponding to the steam pocket 14 and the superheater 19 is higher than 98%, the corresponding steam exhaust primary valve 15 and the superheater steam exhaust primary valve 110 are closed; when the pressure of the nitrogen reaches 0.05MPa, the nitrogen supplement regulating valve 8 (namely the nitrogen adding electric stop valve) is closed. The nitrogen-filling protection system for the power equipment of the thermal power plant provided by the embodiment of the invention can be set to be in an automatic operation state, namely when the pressure of nitrogen is lower than 0.03MPa, the nitrogen-filling regulating valve 8 is controlled to automatically open for nitrogen filling, and when the pressure of nitrogen reaches 0.05MPa, the nitrogen-filling regulating valve 8 is closed to stop nitrogen filling.
Specifically, in practical application, the drum steam exhaust primary valve 15, the drum steam exhaust secondary valve 16, the superheater steam exhaust primary valve 110 and the superheater steam exhaust secondary valve 111 are all formal valves in the protected drum boiler, and because the protected system is a high-temperature and high-pressure system during operation, two valves, namely the primary valve and the secondary valve, are designed to ensure that the valves do not leak and gradually reduce temperature and pressure to exhaust steam.
Specifically, in practical application, a first nitrogen purity monitoring device 17 arranged at the outlet of the steam drum 14 is arranged between the primary steam exhaust valve 15 of the steam drum and the secondary steam exhaust valve 16 of the steam drum; set up the second nitrogen gas purity monitoring devices 112 in over heater exit and install between over heater exhaust primary valve 110 and over heater exhaust secondary valve 111, through closing the isolated high temperature high pressure environment of primary valve, guarantee by the normal operating of protection power equipment 20, when filling nitrogen protection, through opening corresponding equipment primary valve, close corresponding equipment secondary valve and can make nitrogen gas through the nitrogen gas purity monitoring devices 30 of corresponding equipment.
Specifically, in practical application, the nitrogen charging operation process of the steam drum 14 and the nitrogen charging operation process of the superheater 19 can be respectively started by opening the steam drum top nitrogen discharging valve 18 and the superheater nitrogen discharging valve 113, and as the corresponding equipment is filled with nitrogen, redundant gas will be discharged into the atmosphere from the pipeline where the nitrogen discharging valve 70 corresponding to the respective equipment is located, the nitrogen purity monitoring devices (i.e., the first nitrogen purity monitoring device 17 and the second nitrogen purity monitoring device 112) installed therein can perform purity monitoring, and after the purity of the corresponding equipment reaches the preset nitrogen purity threshold value, the nitrogen supplementing regulating valve 8 and the nitrogen discharging valve 70 corresponding to the equipment thereof will be closed. Illustratively, the nitrogen bleed valve 70 should be a valve with remote control and shut-off functions, and no check valve is required.
Specifically, in an embodiment, as shown in fig. 4, the embodiment of the present invention may perform nitrogen charging protection on the high/low pressure heater (i.e., the high pressure heater 225 and the low pressure heater 226), the main body of the nitrogen charging anti-corrosion protection automatic adjusting apparatus of the high/low pressure heater may be disposed at the side of the boiler room 300 or in the steam turbine room 200, after the nitrogen gas supplement apparatus 1 is generated, the nitrogen gas sequentially flows through the connecting valve 2, the nitrogen gas purifying apparatus 3 and the nitrogen gas storage tank 4, and then enters the low steam charging side primary drain valve 23 and the low steam charging side secondary drain valve 21, the low water charging side primary drain valve 24 and the low water charging side secondary drain valve 22, and the high steam charging side primary drain valve 215 and the high steam charging side secondary drain valve 213, the high water charging side primary drain valve 216 and the high water charging side secondary drain valve 214 through a stainless steel pipeline, and this position will be used as a nitrogen charging port of the high/low pressure heater.
Wherein, the low steam-adding side steam-discharging primary valve 25 (i.e. the low pressure heater steam-side steam-discharging pipe primary valve) and the low steam-adding side steam-discharging secondary valve 26 (i.e. the low pressure heater steam-side steam-discharging pipe secondary valve) are connected with the pipeline by opening the pipeline, the position will be used as the steam-side nitrogen purity monitoring port of the low pressure heater 226, the nitrogen purity at the steam-side outlet of the low pressure heater 226 is monitored by additionally installing the low steam-adding side steam-discharging primary valve 27 and the third nitrogen purity monitoring device 28 on the pipeline, wherein, when the low pressure heater 226 is in the working state, the low steam-adding side steam-discharging primary valve 25 and the low steam-adding side steam-discharging secondary valve 26 can be opened and closed to perform the steam-discharging processing at the steam side of the low pressure heater 226.
The determination of the position of the nitrogen purity monitoring port on the water side of the low pressure heater 226 and the arrangement of the nitrogen discharge valve 211 on the low water adding side and the fourth nitrogen purity monitoring device 212 are similar to those on the steam side of the low pressure heater 226, and the detailed description thereof is omitted. When the low-pressure heater 226 is in a working state, the steam discharging treatment of the steam side of the low-pressure heater 226 can be carried out by switching on and off the low water adding side steam discharging primary valve 29 and the low water adding side steam discharging secondary valve 210.
The high steam addition side steam exhaust primary valve 217 (namely, the high pressure heater steam side steam exhaust pipe primary valve) and the high steam addition side steam exhaust secondary valve 218 (namely, the high pressure heater steam side steam exhaust pipe secondary valve) are connected with a pipeline through an opening, the position of the pipeline is used as a steam side nitrogen purity monitoring port of the high pressure heater 225, the high steam addition side steam exhaust primary valve 219 and a fifth nitrogen purity monitoring device 20 are additionally arranged on the pipeline, the nitrogen purity at the steam side outlet of the high pressure heater 225 is monitored, and when the high pressure heater 225 is in a working state, the high steam addition side steam exhaust primary valve 217 and the high steam addition side steam exhaust secondary valve 218 are connected and disconnected, so that the steam exhaust treatment at the steam side of the high pressure heater 225 can be carried out through the high steam addition side steam exhaust primary valve 217 and the high steam addition side steam exhaust secondary valve 218.
The determination of the position of the nitrogen purity monitoring port on the water side of the high pressure heater 225 and the arrangement of the nitrogen discharge valve 223 on the high water adding side and the sixth nitrogen purity monitoring device 224 are similar to those on the steam side of the high pressure heater 225, and the detailed description thereof is omitted. When the high pressure heater 225 is in a working state, the steam discharging treatment of the steam side of the high pressure heater 225 can be carried out by switching on and off the high water adding side steam discharging primary valve 221 and the high water adding side steam discharging secondary valve 222.
Specifically, in practical application, the nitrogen charging protection working flow of the embodiment of the invention for the high/low pressure heater is as follows:
after the unit is shut down, the high-pressure heater 225 finishes discharging water, and has a nitrogen adding condition, so that related valves on a nitrogen adding pipeline are opened, the nitrogen supplementing device 1 is started to inject nitrogen into the high/low-pressure heater, when the third nitrogen purity monitoring device 28, the fourth nitrogen purity monitoring device 212, the fifth nitrogen purity monitoring device 220 and the sixth nitrogen purity monitoring device 224 monitor that the nitrogen purity is more than 98%, the low steam adding side steam discharging primary valve 25, the low water adding side steam discharging primary valve 29, the high water adding side steam discharging primary valve 221 and the high steam adding side steam discharging primary valve 217 at corresponding positions are closed, when the nitrogen pressure reaches 0.05MPa, the nitrogen supplementing regulating valve 8 is closed, and the nitrogen filling is finished. The nitrogen-filling protection system for the power equipment of the thermal power plant provided by the embodiment of the invention can be set to be in an automatic operation state, namely when the pressure of nitrogen is lower than 0.03MPa, the nitrogen-filling regulating valve 8 is automatically opened for nitrogen filling, and when the pressure of nitrogen reaches 0.05MPa, the nitrogen-filling regulating valve 8 is closed to stop nitrogen filling.
Specifically, in an embodiment, as shown in fig. 5, the embodiment of the present invention may perform nitrogen charging protection on the generator internal cooling water system, the main device of the nitrogen adding anti-corrosion protection device for the generator internal cooling water system may be disposed at the side of the boiler room 300 or in the steam turbine room 200, after the nitrogen is generated by the nitrogen supplementing device 1, the nitrogen flows through the connecting valve 2, the nitrogen purification device 3 and the nitrogen storage tank 4 in sequence, and then enters the pipeline between the generator excitation end primary sewage discharge valve 32 (i.e., the generator excitation end manifold sewage discharge pipe primary door) and the generator excitation end secondary sewage discharge valve 31 (i.e., the generator excitation end manifold discharge pipe secondary door) and the generator steam discharge machine end primary valve 38 (i.e., the steam turbine end manifold discharge pipe primary door) and the generator steam end secondary sewage discharge valve 37 (i.e., the steam turbine end manifold discharge pipe secondary door) through a stainless steel pipeline with an inner diameter not less than 20mm, and the pipeline is used as a nitrogen supplementing port of the generator internal cooling water system.
The nitrogen purity at the outlet of the excitation end of the generator is monitored by additionally arranging a nitrogen discharge valve 35 and a seventh nitrogen purity monitoring device 36 on the pipeline, wherein the generator excitation end exhaust primary valve 33 and the generator excitation end exhaust secondary valve 34 are arranged, and when the generator is in a working state, the generator excitation end exhaust primary valve 33 and the generator excitation end exhaust secondary valve 34 can be switched on and off to perform exhaust treatment on the excitation end of the generator.
The method is characterized in that a pipeline opening connecting pipeline is arranged between a generator steam turbine end exhaust primary valve 39 (namely a stator cooling steam turbine end confluence water pipe high point exhaust primary valve) and a generator steam turbine end exhaust secondary valve 310 (namely a stator cooling steam turbine end confluence water pipe high point exhaust secondary valve), the position is used as a nitrogen purity monitoring port at the generator steam turbine end, a generator steam turbine end nitrogen exhaust valve 311 and an eighth nitrogen purity monitoring device 312 are additionally arranged on the pipeline, the nitrogen purity at the outlet of the generator steam turbine end is monitored, wherein the generator steam turbine end exhaust primary valve 39 and the generator steam turbine end exhaust secondary valve 310 are arranged, and when a generator is in a working state, the generator steam turbine end exhaust primary valve 39 and the generator steam turbine end exhaust secondary valve 310 can be switched on and off to perform exhaust treatment at the generator steam turbine end.
The position determination of the nitrogen purity monitoring port at the steam end of the cold water system in the generator and the arrangement of the generator steam end nitrogen discharge valve 311 and the eighth nitrogen purity monitoring device 312 are similar to those at the steam side of the low-pressure heater 226, and are not described herein again. When the low-pressure heater 226 is in a working state, the steam discharging treatment of the steam side of the low-pressure heater 226 can be carried out by switching on and off the low water adding side steam discharging primary valve 29 and the low water adding side steam discharging secondary valve 210.
Specifically, in practical application, the nitrogen charging protection working process of the embodiment of the invention for the cold water system in the generator is as follows:
after the machine set stops, the water discharging of the cold water system in the generator is finished, the nitrogen adding condition is provided, the opening of relevant valves on a nitrogen adding pipeline is ensured, the nitrogen supplementing device 1 is started to inject nitrogen into the cold water system in the generator, when the seventh nitrogen purity monitoring device 36 at the excitation end of the generator and the eighth nitrogen purity monitoring device 312 at the steam end of the generator monitor that the nitrogen purity at the position is more than 98%, the exhaust electric valve is closed, and when the nitrogen pressure reaches 0.05MPa, the nitrogen supplementing regulating valve 8 is closed, and the nitrogen charging is finished. The nitrogen-filling protection system for the power equipment of the thermal power plant provided by the embodiment of the invention can be set to be in an automatic operation state, namely when the pressure of nitrogen is lower than 0.03MPa, the nitrogen-filling regulating valve 8 is automatically opened for nitrogen filling, and when the pressure of nitrogen reaches 0.05MPa, the nitrogen-filling regulating valve 8 is closed to stop nitrogen filling.
It should be noted that, in the embodiment of the present invention, a mode of cross nitrogen supplement at two ends is adopted to protect the cold water system in the generator, that is, nitrogen enters from a blow-off pipe (not shown in the figure) at the bottom of a converging water pipe at the excitation end of the generator, nitrogen is discharged from an exhaust pipe (not shown in the figure) at the top of a converging water pipe at the turbine end of the generator, nitrogen purity monitoring is performed, and relevant valves are closed after the nitrogen purity meets requirements; then nitrogen enters from a blow-off pipe (not shown in the figure) at the bottom of a converging water pipe at the steam turbine end of the generator, the nitrogen is discharged from an exhaust pipe (not shown in the figure) at the top of the converging water pipe at the excitation end of the generator, the purity of the nitrogen is monitored, and relevant valves are closed after the purity of the nitrogen meets the requirement.
In practical applications, the condition for completing the nitrogen charging protection for the different power devices 20 is that the nitrogen purity at the highest point of the power device 20 reaches a preset nitrogen purity threshold, and the basis for determining whether to automatically supplement nitrogen for the different power devices 20 is whether the nitrogen pressure signal obtained by the nitrogen pressure monitoring device 60 of the power device 20 is lower than 0.03MPa.
On the basis of fully considering the actual situation of the thermal power plant, the embodiment of the invention utilizes the existing equipment of the thermal power plant to the greatest extent, and provides a nitrogen charging protection system for the power equipment of the thermal power plant, which can not only timely charge nitrogen into the power equipment 20 for protection when the power equipment needs to be protected, but also monitor the purity and pressure of the nitrogen in real time, realize automatic nitrogen charging according to set parameters, and also can simultaneously or respectively charge nitrogen into a plurality of power equipment 20 for corrosion protection, so that the nitrogen charging protection effect is achieved, the quick start working requirement of a unit of the thermal power plant is not influenced, the utilization efficiency of the existing equipment of the thermal power plant is further improved, and the production cost is greatly reduced.
The embodiment of the invention provides a nitrogen charging protection method for power equipment of a thermal power plant, wherein the thermal power plant comprises a plurality of power equipment, as shown in fig. 6, the nitrogen charging protection method for the power equipment of the thermal power plant specifically comprises the following steps:
step S101: the operating states of the various power plants are monitored.
In particular, in practical application, the power plant can be a steam drum boiler, a high/low pressure heater and a cold water system in a generator. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Step S102: and when the running state of the first power equipment is monitored to be shutdown, controlling the nitrogen supplementing device to supplement nitrogen to the first power equipment. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Step S103: the current nitrogen purity at the outlet end of the first power plant is monitored. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Step S104: and judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value.
Specifically, in practical applications, the preset nitrogen purity threshold can be set according to DLT/956-2017 "rust prevention guide rule for thermal power plant shutdown (standby) thermal equipment", and the numerical value is 98%. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Step S105: and when the current nitrogen purity reaches a preset nitrogen purity threshold, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Specifically, in an embodiment, before the step S105 is executed to control the nitrogen gas supplementing device to stop supplementing nitrogen gas to the first power plant, the method specifically includes the following steps:
step S201: the current nitrogen pressure in the first power plant is monitored. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Step S202: and judging whether the current nitrogen pressure reaches a preset nitrogen pressure threshold value. For details, reference is made to the related description in the above embodiment of the nitrogen-charging protection system, and details are not repeated herein.
Specifically, in practical application, the preset nitrogen pressure threshold can be set according to DLT/956-2017 thermal power plant stopping (standby) thermodynamic equipment anti-corrosion guide rule, and the numerical value is 0.05MPa.
Step S203: and when the current nitrogen pressure measured value reaches the preset nitrogen pressure threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
Specifically, in practical application, according to DLT/956-2017, namely the Rust prevention and corrosion guide rule of thermal equipment for shutdown (standby) of a thermal power plant, the nitrogen pressure is maintained to be 0.03MPa-0.05MPa, and in order to realize the high efficiency of nitrogen charging protection of power equipment of the thermal power plant, when the obtained nitrogen pressure is less than 0.03MPa, the nitrogen charging inlet valve is controlled to be opened for nitrogen charging, and when the obtained nitrogen pressure reaches 0.05MPa, the nitrogen charging inlet valve is controlled to be closed, so that waste of nitrogen resources is avoided,
specifically, in an embodiment, the method specifically includes the following steps:
step S301: and when the current nitrogen pressure measured value is not less than the preset nitrogen pressure threshold value and the nitrogen purity measured value is not less than the preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment, and returning to the step S101. For details, reference is made to the related description of the above embodiment of the nitrogen-charging protection system, and no further description is given here.
By executing the steps, the method for protecting the power equipment of the thermal power plant by filling nitrogen provided by the embodiment of the invention monitors the running state of each power equipment, and when the first power equipment is in the shutdown state, the first power equipment is protected by filling nitrogen in time, and the power equipment is protected by filling nitrogen in the first time when the power equipment is shutdown, so that the corrosion and scaling of the power equipment caused by long shutdown time are avoided, and the safe and stable running of the power equipment is ensured; through monitoring the nitrogen purity of first power equipment exit end, when current nitrogen purity reaches and predetermines nitrogen purity threshold value, control nitrogen gas filling device stops to supply nitrogen gas to first power equipment, when carrying out abundant anticorrosion protection to first power equipment, avoids nitrogen gas extravagant, has more the feature of environmental protection.
The method for protecting the power plant nitrogen charging provided by the embodiment of the invention will be described in detail below with reference to specific application examples.
As shown in fig. 3, taking power equipment as a drum boiler as an example, in the embodiment of the present invention, nitrogen is injected into the drum boiler through a nitrogen injection pump through a nitrogen delivery pipeline and a boiler blowdown primary valve, the boiler heating surface, the drum and a superheater system are sequentially filled with nitrogen, the nitrogen exhausted from the drum and the superheater is respectively monitored by using a first nitrogen purity monitoring device and a second nitrogen purity monitoring device, when a nitrogen purity meter displays a nitrogen purity value and outputs a standard signal to a nitrogen charging control cabinet, the nitrogen charging control cabinet compares a received nitrogen purity signal with a preset nitrogen purity threshold, if the current nitrogen purities of two positions are greater than 98%, it is determined that the drum boiler is filled with nitrogen, a top nitrogen discharge valve, a superheater nitrogen discharge valve and a nitrogen supplement regulating valve of the drum are controlled to be closed, and if at least one value of the current purities of the two positions is less than 98%, it is determined that the drum boiler is not filled with nitrogen, the nitrogen is continuously supplemented until the current purities of the two positions are greater than 98%; the pressure in the drum boiler can be automatically monitored in real time by using a nitrogen pressure monitoring device during the period of nitrogen charging protection of the drum boiler, when the current nitrogen pressure is less than 0.03MPa, a nitrogen charging pump and a nitrogen charging regulating valve are automatically opened to supply nitrogen to the drum boiler, when the current nitrogen pressure is more than 0.05MPa, the nitrogen charging to the drum boiler is stopped, and the pressure state is automatically monitored again.
The embodiment of the invention can refer to a process for protecting the nitrogen filling of the drum boiler as shown in fig. 3, carry out the nitrogen filling protection on the high/low pressure heater and the cold water system in the generator, and form the nitrogen filling protection system for the power equipment of the thermal power plant as shown in fig. 1. As shown in fig. 6, when the overall system is in a protected period, the embodiment of the present invention monitors the nitrogen pressure in the drum boiler, the high/low pressure heater and the cold water system in the generator by using the nitrogen pressure monitoring device of the boiler system, the nitrogen pressure monitoring device of the high/low pressure system and the nitrogen pressure monitoring device of the cold water system in the generator, respectively. When the current nitrogen pressure at a certain power equipment is less than 0.03MPa, nitrogen can be supplemented to the power equipment by opening the nitrogen injection pump and the nitrogen supplement regulating valve and the nitrogen supplement valve corresponding to the power equipment; when the pressure of the nitrogen in the power equipment reaches 0.05MPa, the nitrogen charging of the power equipment is stopped, and the pressure state is automatically monitored again.
On the basis of fully considering the actual condition of the thermal power plant, the embodiment of the invention utilizes the existing equipment of the thermal power plant to the greatest extent, and provides a nitrogen charging protection system for the power equipment of the thermal power plant, which can not only timely charge nitrogen into the power equipment for protection when the power equipment needs to be protected, but also monitor the purity and pressure of the nitrogen in real time, realize automatic nitrogen charging according to set parameters, and also can simultaneously or respectively perform nitrogen charging anti-corrosion protection on a plurality of power equipment, so that the nitrogen charging protection effect is achieved, the quick start working requirement of a unit of the thermal power plant is not influenced, the utilization efficiency of the existing equipment of the thermal power plant is further improved, and the production cost is greatly reduced.
An embodiment of the present invention provides a nitrogen charging protection device for power equipment of a thermal power plant, where the thermal power plant includes a plurality of power equipment, as shown in fig. 7, the nitrogen charging protection device for power equipment of the thermal power plant includes:
the first monitoring module 101 is used for monitoring the running state of each power device. For details, refer to the related description of step S101 in the above method embodiment, and no further description is provided here.
The first processing module 102 is configured to control the nitrogen gas supplementing device to supplement nitrogen gas to the first power equipment when the operation state of the first power equipment is monitored to be shutdown. For details, refer to the related description of step S102 in the above method embodiment, and no further description is provided here.
And the second monitoring module 103 is used for monitoring the current nitrogen purity at the outlet end of the first power equipment. For details, refer to the related description of step S103 in the above method embodiment, and no further description is provided here.
And the judging module 104 is configured to judge whether the current nitrogen purity reaches a preset nitrogen purity threshold. For details, refer to the related description of step S104 in the above method embodiment, and no further description is provided here.
And the second processing module 105 is configured to control the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment when the current nitrogen purity reaches a preset nitrogen purity threshold. For details, refer to the related description of step S105 in the above method embodiment, and no further description is provided here.
For further description of the above-mentioned nitrogen charging protection device for power equipment of a thermal power plant, reference is made to the above-mentioned description of the embodiment of the nitrogen charging protection method for power equipment of a thermal power plant, and details are not repeated herein.
Through the cooperative cooperation of the components, the nitrogen charging protection device for the power equipment of the thermal power plant provided by the embodiment of the invention monitors the running state of each power equipment, and performs nitrogen charging protection on the first power equipment in time when the first power equipment is in a shutdown state, and performs nitrogen charging protection on the power equipment at the first time when the power equipment is shutdown, so that the corrosion and scaling of the power equipment caused by long shutdown time are avoided, and the safe and stable running of the power equipment is ensured; through monitoring the nitrogen purity of first power equipment exit end, when current nitrogen purity reaches and predetermines nitrogen purity threshold value, control nitrogen gas filling device stops to supply nitrogen gas to first power equipment, when carrying out abundant anticorrosion protection to first power equipment, avoids nitrogen gas extravagant, has more the feature of environmental protection.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, and the implemented program can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk Drive (Hard Disk Drive, abbreviated as HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims (11)

1. A method for protecting nitrogen charging of power equipment of a thermal power plant, wherein the thermal power plant comprises a plurality of power equipment, and the method comprises the following steps:
monitoring the running state of each power device;
when the running state of the first power equipment is monitored to be shutdown, controlling a nitrogen supplementing device to supplement nitrogen to the first power equipment;
monitoring the current nitrogen purity at the outlet end of the first power equipment;
judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value;
and when the current nitrogen purity reaches the preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment.
2. The method of claim 1, wherein prior to controlling the nitrogen make-up device to stop making up nitrogen to the first power plant, the method further comprises:
monitoring a current nitrogen pressure in the first power plant;
judging whether the current nitrogen pressure reaches a preset nitrogen pressure threshold value;
and when the current nitrogen pressure measured value reaches the preset nitrogen pressure threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment.
3. The method of claim 2, further comprising:
and when the current nitrogen pressure measured value is not less than the preset nitrogen pressure threshold value and the nitrogen purity measured value is not less than the preset nitrogen purity threshold value, controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment, and returning to the step of monitoring the running state of each power equipment.
4. The utility model provides a thermal power plant power equipment protection device that fills nitrogen which characterized in that, thermal power plant includes a plurality of power equipment, the device includes:
the first monitoring module is used for monitoring the running state of each power device;
the first processing module is used for controlling the nitrogen supplementing device to supplement nitrogen to the first power equipment when the running state of the first power equipment is monitored to be shutdown;
the second monitoring module is used for monitoring the current nitrogen purity at the outlet end of the first power equipment;
the judging module is used for judging whether the current nitrogen purity reaches a preset nitrogen purity threshold value;
and the second processing module is used for controlling the nitrogen supplementing device to stop supplementing nitrogen to the first power equipment when the current nitrogen purity reaches the preset nitrogen purity threshold.
5. The utility model provides a thermal power plant power equipment protection system that fills nitrogen which characterized in that, thermal power plant includes a plurality of power equipment, thermal power plant power equipment fills nitrogen protection system and includes: a nitrogen supplementing device, a nitrogen charging control cabinet and a nitrogen purity monitoring device which is arranged in one-to-one correspondence with the power equipment, wherein,
the output end of the nitrogen supplementing device is respectively connected with each power device;
the nitrogen purity monitoring device is connected with a first input end of the nitrogen charging control cabinet and is used for acquiring the current nitrogen purity in the corresponding power equipment and sending the current nitrogen purity to the nitrogen charging control cabinet;
the nitrogen charging control cabinet comprises a memory and a processor, wherein the memory and the processor are connected with each other in a communication mode, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the method according to any one of claims 1-3.
6. The thermal power plant nitrogen charge protection system of claim 5, further comprising: nitrogen conveying pipelines which are arranged corresponding to the power equipment one by one,
one end of the nitrogen conveying pipeline is connected with the nitrogen supplementing device, the other end of the nitrogen conveying pipeline is connected with the corresponding power equipment, and a control valve is arranged on the nitrogen conveying pipeline and connected with the nitrogen charging control cabinet.
7. The thermal power plant nitrogen charge protection system of claim 5, further comprising: nitrogen pressure monitoring devices which are in one-to-one correspondence with the power equipment,
the nitrogen pressure monitoring device is arranged at a nitrogen inlet of the corresponding power equipment;
the nitrogen pressure monitoring device is connected with a second input end of the nitrogen charging control cabinet and is suitable for monitoring the current nitrogen pressure at a nitrogen inlet of the power equipment and feeding the current nitrogen pressure back to the nitrogen charging control cabinet.
8. The thermal power plant nitrogen charge protection system of claim 5, further comprising: a nitrogen injection pump, a nitrogen supplement regulating valve and a nitrogen supplement inlet valve, wherein,
the input end of the nitrogen injection pump is connected with the output end of the nitrogen supplementing device, and the output end of the nitrogen injection pump is connected with the input end of the nitrogen supplementing regulating valve;
the control end of the nitrogen supplementing regulating valve is connected with the output end of the nitrogen supplementing control cabinet, and the output end of the nitrogen supplementing regulating valve is connected with the input end of the nitrogen supplementing inlet valve;
and the output end of the nitrogen supplementing inlet valve is respectively connected with the input end of the control valve of each power device.
9. The thermal power plant nitrogen charge protection system of claim 5, wherein the power plant is a drum boiler, and/or a high/low pressure heater, and/or a cold water system in a generator.
10. The thermal power plant nitrogen charging protection system as defined in any one of claims 5 to 9, further comprising: a nitrogen purification device and nitrogen discharge valves which are arranged corresponding to each power device one by one, wherein,
the outlet end of the nitrogen purification device is connected with the input end of the nitrogen storage tank and is suitable for supplementing purified nitrogen into the nitrogen storage tank;
the input end of each nitrogen discharge valve is respectively connected with the output end of the corresponding power equipment, and the output end of each nitrogen discharge valve is respectively connected with the input end of the corresponding nitrogen purity monitoring device.
11. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1-3.
CN202211240037.2A 2022-10-11 2022-10-11 Nitrogen charging protection method, device and system for power equipment of thermal power plant Pending CN115451342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211240037.2A CN115451342A (en) 2022-10-11 2022-10-11 Nitrogen charging protection method, device and system for power equipment of thermal power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211240037.2A CN115451342A (en) 2022-10-11 2022-10-11 Nitrogen charging protection method, device and system for power equipment of thermal power plant

Publications (1)

Publication Number Publication Date
CN115451342A true CN115451342A (en) 2022-12-09

Family

ID=84308164

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211240037.2A Pending CN115451342A (en) 2022-10-11 2022-10-11 Nitrogen charging protection method, device and system for power equipment of thermal power plant

Country Status (1)

Country Link
CN (1) CN115451342A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117329380A (en) * 2023-11-24 2024-01-02 福建华电邵武能源有限公司 Water vapor system shutdown corrosion protection pipeline structure of ultra-supercritical unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117329380A (en) * 2023-11-24 2024-01-02 福建华电邵武能源有限公司 Water vapor system shutdown corrosion protection pipeline structure of ultra-supercritical unit
CN117329380B (en) * 2023-11-24 2024-04-09 福建华电邵武能源有限公司 Water vapor system shutdown corrosion protection pipeline structure of ultra-supercritical unit

Similar Documents

Publication Publication Date Title
CN115451342A (en) Nitrogen charging protection method, device and system for power equipment of thermal power plant
CN210396827U (en) Thermal power plant thermal equipment shutdown protection system
CN114234173B (en) Nuclear power station steam generator cooling system
CN204040107U (en) A kind of water delivery pumping station system
CN109166638B (en) Coolant hydrogenation system and method for small stack
CN111058902A (en) Energy-saving system and energy-saving control method based on industrial steam turbine asynchronous power generation
CN110726132B (en) Method and system for supplying water to steam generator of nuclear power station under low-power working condition
KR20160142164A (en) Containment spray system using pressurizer steam, and the method with the same and the reactor comprising the same
CN102425794B (en) Burner nozzle cooling water system
CN109801722B (en) Heat exchange test method and system for plate heat exchanger of SEU (continuous emission unit) system of nuclear power plant
CN102620278B (en) Method and device for controlling feedwater flow of boiler
CN210164663U (en) Double-pneumatic feed water pump steam turbine recirculation water pipeline device
CN209045174U (en) The passive emergency boronation system of nuclear power station
CN217588437U (en) High temperature gas cooled reactor by-pass valve operation system
CN216429784U (en) Natural gas heating device
CN116024576A (en) Full-automatic intelligent anti-corrosion system for power plant generator set and operation method
CN114811564A (en) Intelligent nitrogen shutdown protection process for thermal power generating unit
CN204530859U (en) Nuclear power plant's emergency feedwater supply system flow control device
CN114811566A (en) Intelligent boiler shutdown protection process for starting boiler of thermal power generating unit
CN212777304U (en) Temperature-reducing water system
CN214120805U (en) Converter waste heat recovery steam supplementing system
CN218763328U (en) Intelligent nitrogen shutdown protection system for thermal power generating unit
CN105202515A (en) Electric pump free 300MW unit halting method and device
CN217235551U (en) Wet maintenance system of high-temperature gas cooled reactor steam generator
CN217843823U (en) Intelligent boiler shutdown protection system for starting boiler of thermal power generating unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination