Method for evaluating abnormal expansion state of piping system

Abstract

The invention provides a method for evaluating the abnormal expansion state of a piping system, and belongs to the technical field of pipeline risk assessment. Firstly, a monitoring point on a pipeline is selected, and an annular hoop, a signal transmitter and a target plate are arranged; then the target plate detects the axial displacement and the radial displacement of the pipeline, so that the transverse displacement is calculated, and real-time displacement data is obtained; and finally, comparing the real-time displacement data with a design value, and judging the state of the pipeline. According to the invention, second-level situation awareness of pipeline deformation is realized, a traditional outdated management mode of using a physical displacement meter is greatly changed, and problems are found, positioned and solved in the first time.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline risk assessment, and in particular, relates to a method for evaluating an abnormal expansion state of a pipeline system. Background Art

[0002] At present, the main equipment in the power industry is large in size and has a complex installation structure. Under severe working conditions such as deep peak regulation and start-stop peak regulation of units, the stress abnormality caused by the abnormal expansion of metal parts in power plants is becoming increasingly apparent. In recent years, the power industry has experienced frequent accidents such as type IV cracks in the main steam P91 pipeline, abnormal deformation of pipeline settlement, frequent failure of supports and hangers, and vibration damage failure of pipeline welding joints, which have caused great safety hazards to power station equipment. However, most of the expansion indicator devices in power plants currently do not play the corresponding role. First, the expansion indicator is damaged and cannot be read, and second, the recorded results are seriously missing or even falsified. This makes it impossible to truly grasp the expansion process and expansion state of the pipeline or header, and once an accident occurs, it will be a catastrophic event.

[0003] Current traditional mechanical expansion indicator devices have problems:

[0004] (1) Power generation companies lack systematic records of the expansion status of pipelines and headers, especially during the critical load intervals of deep peak regulation and during the start-up and shutdown phases;

[0005] (2) The scale of the on-site expansion indicator is unclear, the dial is covered with oil, dust, etc., or even damaged; the moving parts of the expansion indicator device are stuck, the marking rod is not in contact with the dial, resulting in failure to record, etc.;

[0006] (3) The expansion indicator is installed in an improper position, or there is a blind spot for expansion monitoring due to the direction of the pipeline, making it impossible to truly record the displacement of the pipeline;

[0007] (4) Inspection personnel may make large errors when visually reading dial data, and current methods focus on post-event detection and post-event discovery, lacking early warning safety evaluation methods.

[0008] Therefore, it is of great significance to design a device that can monitor the expansion position of the pipeline in real time and evaluate the safety status of abnormal pipeline expansion through certain methods. Summary of the invention

[0009] In view of the above problems, the present invention proposes a method for evaluating the abnormal expansion state of the piping system, which can intelligently identify the three-dimensional displacement of the high-temperature and high-pressure pipeline of the power station by measuring the device, and intelligently identify the three-dimensional displacement of the high-temperature and high-pressure pipeline of the power station through online recording and trend analysis of the three-dimensional displacement.

[0010] The present invention is achieved through the following technical solutions:

[0011] A method for evaluating an abnormal expansion state of a pipe system, the method specifically comprising the following steps:

[0012] Step 1, select the monitoring points on the pipeline, and arrange the annular clamp, signal transmitter and targeting plate;

[0013] Step 2: The targeting plate detects the axial displacement and radial displacement of the pipeline, thereby calculating the lateral displacement and obtaining real-time displacement data;

[0014] Step 3, compare the real-time displacement data of step 2 with the design value to determine the status of the pipeline.

[0015] Furthermore, in step 1, the monitoring point location is selected as a position that is easy to expand in conventional pipeline design, an annular clamp is arranged at the monitoring point location selected on the pipeline, a targeting plate is arranged on the clamp, and a signal transmitter is installed at the steel structure position around the targeting plate. The targeting plate is used to receive the signal emitted by the transmitter and record the trajectory.

[0016] Furthermore, in step 2,

[0017] The targeting plate is provided with a two-way displacement monitoring device, which receives and records the signal from the signal transmitter to detect the axial displacement and radial displacement of the pipeline, and calculates the lateral displacement in combination with the arrangement information of step 1;

[0018] According to the distance from the front end of the transmitter to the target plate arranged in step 1, v is the signal transmission speed, t is the time from the signal being sent from the transmitter to the target plate receiving it, calculate the lateral displacement L:

[0019] L=v×t.

[0021] Furthermore, in step 3,

[0022] The expansion of the pipe system monitoring point is within ±10% of the design value, and the expansion state of the pipe is within the normal fluctuation range;

[0023] The expansion of the pipe system monitoring point should be within ±10% to ±20% of the design value. The expansion of the pipe needs to be continuously monitored in combination with the load fluctuation.

[0024] If the expansion deviation of the piping monitoring point is ≥±20% compared with the design value, the point with the maximum displacement needs to be taken as the boundary condition to check the stress state of the piping system.

[0025] Furthermore, in step 3, the stress state of the piping system is checked as follows:

[0026] If the piping stress value is less than 80% of the allowable stress, the operation can be supervised;

[0027] If the pipe system stress value is ≥ 80% of the allowable stress and ≤ 90%, the pipe supports and hangers should be replaced or the support and hanger loads should be adjusted, and the pipe system should continue to use the pipe system if the calculation is feasible through finite element analysis.

[0028] When the piping stress value is ≥ 90% of the allowable stress, the piping design should be checked immediately, the reasons for the excessive stress distribution should be analyzed, and the supports and hangers that do not meet the operating requirements should be replaced. The stress distribution of the readjusted pipe supports and hangers should be uniform, and the local stress should not be too large.

[0029] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0030] A computer-readable storage medium is used to store computer instructions, and when the computer instructions are executed by a processor, the steps of the above method are implemented.

[0031] Beneficial effects of the present invention

[0032] The present invention is applicable to deep peak-shaving coal-fired power units with a capacity of 300MW and above, and is mainly aimed at the four major pipelines in the power plant, including the main steam pipeline (two high-temperature and high-pressure steam pipelines between the superheater outlet header and the high-pressure main steam valve interface), the hot reheat steam pipeline (two high-temperature and high-pressure steam pipelines from the reheater outlet header to the medium-pressure main steam valve interface), the cold reheat steam pipeline (two high-temperature and high-pressure steam pipelines between the high-pressure cylinder exhaust port and the reheater inlet header interface), and the high-pressure feed water pipeline (the high-pressure boiler supply water pipeline between the electric feed water pump outlet and the economizer inlet header interface).

[0033] The mobile monitoring of pipeline deformation of the present invention realizes the situation awareness of pipeline deformation in seconds through industrial mobile Internet technology, which greatly changes the backward management mode of traditional use of physical displacement meter (Go board), and finds, locates and solves problems in the first time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the horizontal pipeline arrangement with the targeting plate above.

[0035] Figure 2 Schematic diagram of the vertical pipeline arrangement of the targeting plate.

[0036] Figure 3 Schematic diagram of the horizontal pipeline arrangement with the targeting plate below.

[0037] Figure 4 It is a data transmission schematic diagram of the present invention.

[0038] Figure 5 It is a software interface display diagram of the present invention. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] A method for evaluating abnormal expansion state of a pipe system: the method specifically comprises the following steps:

[0041] Step 1, select the monitoring points on the pipeline, and arrange the annular clamp, signal transmitter and targeting plate;

[0042] In step 1, in order to accurately measure the three-dimensional displacement expansion changes of the high-temperature and high-pressure pipeline of the power station, it is necessary to set up monitoring points first. The location of the monitoring point is selected as the easy-to-expand location or typical observation point in the conventional pipeline design. A circumferential clamp is arranged at the monitoring point selected by the pipeline, and a targeting plate is arranged on the clamp. At the same time, a signal transmitter is installed at the steel structure position around the targeting plate to transmit signals to the targeting plate in real time. The targeting plate is used to receive the signal emitted by the transmitter and the trajectory record; thereby, the three-dimensional expansion displacement of the pipeline is monitored and recorded in real time.

[0043] Step 2: The targeting plate detects the axial displacement and radial displacement of the pipeline, thereby calculating the lateral displacement and obtaining real-time displacement data;

[0044] The targeting plate is provided with a two-way displacement monitoring device, which receives and records the signal from the signal transmitter to detect the axial displacement and radial displacement of the pipeline, and calculates the lateral displacement in combination with the arrangement information of step 1;

[0045] According to the distance from the front end of the transmitter to the target plate arranged in step 1, v is the signal transmission speed, t is the time from the signal being sent from the transmitter to the target plate receiving it, calculate the lateral displacement L:

[0046] L=v×t.

[0048] Step 3, compare the real-time displacement data of step 2 with the design value to determine the status of the pipeline.

[0049] The expansion of the pipe system monitoring point is within ±10% of the design value, and the expansion state of the pipe is within the normal fluctuation range;

[0050] The expansion of the pipe system monitoring point should be within ±10% to ±20% of the design value. The expansion of the pipe needs to be continuously monitored in combination with the load fluctuation.

[0051] If the expansion deviation of the piping monitoring point is ≥±20% compared with the design value, the point with the maximum displacement needs to be taken as the boundary condition to check the stress state of the piping system.

[0052] If the piping stress value is less than 80% of the allowable stress, the operation can be supervised;

[0053] If the pipe system stress value is ≥ 80% of the allowable stress and ≤ 90%, the pipe supports and hangers should be replaced or the support and hanger loads should be adjusted at an appropriate time, and the pipe system should continue to be used if the calculation is feasible through finite element analysis;

[0054] When the piping stress value is ≥ 90% of the allowable stress, the piping design should be checked immediately, the reasons for the excessive stress distribution should be analyzed, and the supports and hangers that do not meet the operating requirements should be replaced. The stress distribution of the readjusted pipe supports and hangers should be uniform, and the local stress should not be too large.

[0055] Combination Figures 1 to 5 In the embodiment, the pipeline is a high-temperature and high-pressure pipeline. Under normal unit operation, the pipeline temperature is usually 500°C-580°C, so the clamp is usually made of alloy steel of the same material as the pipeline. The ambient temperature of the pipeline in an exposed state is usually 50°C-70°C, so the limit temperature of various components inside the targeting board and the signal transmitter must be greater than this range.

[0056] At the same time, the targeting board and the signal transmitter need to be made of high temperature resistant materials to ensure that the output remains stable at high temperatures, which can ensure the continuous signal output of the signal transmitter and the continuous signal reception of the targeting board.

[0057] like Figure 1-3 As shown, the targeting plate of the present invention has a variety of installation methods in combination with the arrangement of the pipeline. When the pipeline is in a (close to) horizontal state, the targeting plate can be installed above or below the horizontal pipeline; when the pipeline is in a (close to) vertical state, the targeting plate can be installed on the left / right of the vertical pipeline.

[0058] like Figure 4In the embodiment of the present invention, additional sensors can be added to measure other physical quantities related to the pipeline status (such as temperature, pressure, vibration, etc.), and the current signal is converted into a digital signal through a high-sensitivity analog-to-digital conversion module. The built-in computer then calculates the digital signal into the displacement of the pull line, and the monitoring analyzer uses 5G technology to transmit the displacement to the cloud database service. The cloud server obtains the real displacement data of the pipeline through collection, processing, and secondary calculation and stores it in the server. The cloud service uses JAVA+HTML5 technology to count and analyze the data, in which the alarm module compares the movement data of each pipeline and sends an alarm if it exceeds the threshold. The alarm can be received and viewed on the mobile phone and the monitoring computer. You can also use a large-screen display to comprehensively display the three-axis movement of the pipeline, temperature and humidity changes, pipeline pressure, temperature and other indicators, and finally achieve all-round monitoring of the pipeline.

[0059] Mobile monitoring of pipeline deformation uses industrial mobile Internet technology to achieve second-level situational awareness of pipeline deformation, which greatly changes the traditional backward management method of using physical displacement meters (Go boards), and can detect, locate and solve problems in the first place.

[0060] like Figure 5 The software architecture of the terminal display is divided into the bottom layer, middle layer and upper layer. The bottom layer provides data collection and processing capabilities, and provides users with operation and maintenance data in the form of interfaces. It supports distributed collection and has multiple interfaces such as data collection equipment, network, serial port data, MQTT, webservice, socket, etc. The platform has more than 5,000 points of big data collection and storage capabilities, and provides technical possibilities for scenario-based management customization. The middle layer provides basic processing of monitoring data, and provides processing capabilities such as alarms, reports, historical records, and intelligent analysis.

[0061] The upper layer provides a variety of data visualization display methods such as pipeline topology and 3D pipeline topology view (optional), creating an easy-to-use smart pipeline monitoring platform for users. Various terminals that support HTML5, including desktops, laptops, tablets, mobile phones, etc., can view the cloud SaaS service status at any time. The power plant only needs to use a large screen to see the real-time status information and alarm information of the pipeline. The pipeline thermal map more intuitively shows the relationship between the pipeline and the design value. It can also display the displacement and stress of the pipeline in the form of data charts, and the temperature and humidity difference between the observation point and the environment and other comprehensive information.

[0062] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0063] A computer-readable storage medium is used to store computer instructions, and when the computer instructions are executed by a processor, the steps of the above method are implemented.

[0064] The memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory, ROM, a programmable read-only memory, PROM, an erasable programmable read-only memory, EPROM, an electrically erasable programmable read-only memory, EEPROM, or a flash memory. The volatile memory may be a random access memory, RAM, which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory static RAM, SRAM, dynamic random access memory dynamic RAM, DRAM, synchronous dynamic random access memory synchronous DRAM, SDRAM, double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM, enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM, synchronous link dynamic random access memory synchlink DRAM, SLDRAM, and direct memory bus random access memory direct rambus RAM, DR RAM. It should be noted that memory of the methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0065] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center through a wired method such as coaxial cable, optical fiber, digital subscriber line digital subscriber line, DSL or wireless such as infrared, wireless, microwave, etc. to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium such as a floppy disk, a hard disk, a tape, an optical medium such as a high-density digital video disc digital video disc, DVD, or a semiconductor medium such as a solid state hard disk solid state disc, SSD, etc.

[0066] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0067] It should be noted that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor DSP, an application-specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor can be combined to perform. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0068] The above is a detailed introduction to a method for evaluating the abnormal expansion state of a piping system proposed in the present invention, and the principles and implementation methods of the present invention are explained. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for evaluating abnormal expansion state of a piping system, characterized in that: The method specifically comprises the following steps: Step 1, select the monitoring points on the pipeline, and arrange the annular clamp, signal transmitter and targeting plate; Step 2: The targeting plate detects the axial displacement and radial displacement of the pipeline, thereby calculating the lateral displacement and obtaining real-time displacement data; Step 3, compare the real-time displacement data of step 2 with the design value to determine the status of the pipeline.

2. The method according to claim 1, characterized in that: In step 1, the monitoring point location is selected as the easy-to-expand location in the conventional pipeline design, and an annular clamp is arranged at the monitoring point location selected on the pipeline, and a targeting plate is arranged on the clamp. At the same time, a signal transmitter is installed at the steel structure position around the targeting plate. The targeting plate is used to receive the signal emitted by the transmitter and record the trajectory.

3. The method according to claim 2, characterized in that: In step 2, The targeting plate is provided with a two-way displacement monitoring device, which receives and records the signal from the signal transmitter to detect the axial displacement and radial displacement of the pipeline, and calculates the lateral displacement in combination with the arrangement information of step 1; According to the distance from the front end of the transmitter arranged in step 1 to the target plate, v is the signal transmission speed, t is the time from the signal being sent from the transmitter to the target plate receiving it, calculate the lateral displacement L: L=v×t.

4. The method according to claim 3, characterized in that: In step 3, The expansion of the pipe system monitoring point is within ±10% of the design value, and the expansion state of the pipe is within the normal fluctuation range; The expansion of the pipe system monitoring point should be within ±10% to ±20% of the design value. The expansion of the pipe needs to be continuously monitored in combination with the load fluctuation. If the expansion deviation of the piping monitoring point is ≥±20% compared with the design value, the point with the maximum displacement needs to be taken as the boundary condition to check the stress state of the piping system.

5. The method according to claim 4, characterized in that: In step 3, the stress state of the piping system is checked as follows: If the piping stress value is less than 80% of the allowable stress, the operation can be supervised; If the pipe system stress value is ≥ 80% of the allowable stress and ≤ 90%, the pipe supports and hangers should be replaced or the support and hanger loads should be adjusted, and the pipe system should continue to use the pipe system if the calculation is feasible through finite element analysis. When the piping stress value is ≥ 90% of the allowable stress, the piping design should be checked immediately, the reasons for the excessive stress distribution should be analyzed, and the supports and hangers that do not meet the operating requirements should be replaced. The stress distribution of the readjusted pipe supports and hangers should be uniform, and the local stress should not be too large.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium for storing computer instructions, characterized in that: When the computer instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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