Safety early warning method and system for raw coal bunker of thermal power plant

Abstract

The invention discloses a safety early warning method and system for a raw coal bunker of a thermal power plant, and the method comprises the steps: obtaining the wall thickness data of each layer of the raw coal bunker of the thermal power plant in time through the detection of a plurality of layers of measurement points, enabling the originally unpredictable wall thickness reduction rate to become quantifiable, setting an early warning condition based on a preset proportion and a preset threshold value of each layer; and further safety early warning grading is carried out through data of all layers, so that different countermeasures can be selected subsequently according to different early warning grades, resource waste caused by excessive maintenance is avoided, accident risks caused by insufficient maintenance are prevented, the overall wall thickness condition of the raw coal bunker is mastered in real time, and the safety of the raw coal bunker is improved. According to the method, major accidents of collapse of the raw coal bunker can be effectively prevented, the economic loss of a thermal power plant is reduced, and the risk of personal injury is reduced.

Description

Technical Field

[0001] This invention belongs to the field of safety early warning in thermal power plants, and relates to a safety early warning method and system for raw coal bunkers in thermal power plants. Background Technology

[0002] The raw coal bunker is a container for temporarily storing fuel in thermal power plants. Its structure typically consists of an upper cylindrical body and a lower conical body. As coal falls from the conveyor belt into the bunker, it continuously erodes and wears down the bunker walls. The water and sulfur in the coal, when trapped in the bunker, form acidic substances that corrode the bunker walls. Over time, this continuous wear and corrosion thins the bunker walls, leading to coal dust leakage, reduced structural strength, decreased overall pressure resistance, and in severe cases, even collapse. Thermal power plant unit maintenance cycles are long, and inspections of the upper bunker require scaffolding, generally only conducted during major overhauls. However, the rate of wall thinning is unpredictable, and the remaining wall thickness is unknown. Excessive maintenance cycles can cause wall perforation or even complete collapse during operation. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art where the maintenance cycle of power plant units is long, the remaining wall thickness is unknown, and the remaining wall thickness cannot be obtained in a timely manner. The long maintenance cycle may cause the cylinder wall to perforate or even collapse during operation. This invention provides a safety early warning method and system for the raw coal bunker of thermal power plants.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A safety early warning method for raw coal bunkers in thermal power plants includes the following steps: Given multiple measurement points, obtain the wall thickness of each layer in the raw coal bunker of a thermal power plant based on these measurement points. If, in any given layer, a predetermined proportion of measurement points find that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, then the current layer is deemed to meet the warning conditions. The number of layers that meet the early warning criteria: When the number of layers that meet the early warning conditions is 1, the current operating condition is determined to be a Level 3 early warning. When the number of layers that meet the early warning conditions is greater than 1 and less than the total number of layers, the current working condition is determined to be a Level 2 early warning. When the number of layers that meet the early warning conditions equals the total number of layers, the current operating condition is determined to be a Level 1 early warning.

[0005] A further improvement of the present invention is that: When a predetermined proportion of measurement points in any given layer find that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, the current layer is determined to meet the warning conditions, including: The number of predetermined proportion measurement points is greater than or equal to 75% of all measurement points on this floor.

[0006] When a predetermined proportion of measurement points in any given layer determine that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, the current layer is deemed to meet the warning conditions, including: The predetermined threshold is less than 20% of the designed wall thickness.

[0007] The process of obtaining the wall thickness of each layer of the raw coal bunker in a thermal power plant based on multiple measurement points includes: Multiple probes are arranged on each layer of the raw coal bunker cylinder, forming multiple measurement points.

[0008] The probe is an ultrasonic probe or an electromagnetic ultrasonic probe.

[0009] Six or eight probes are placed on each layer of the raw coal bunker cylinder.

[0010] It also includes developing different early warning measures based on different levels of alert.

[0011] By detecting multiple measurement points, the wall thickness data of each layer of the raw coal bunker in a thermal power plant can be obtained in a timely manner, making the previously unpredictable wall thickness reduction rate quantifiable. First, warning conditions are set based on a predetermined proportion and threshold for each layer. Then, further safety warning classification is performed using data from all layers, which facilitates the selection of different response measures for different warning levels. This avoids the waste of resources caused by over-maintenance and prevents the accident risks caused by insufficient maintenance. The method disclosed in this invention can monitor the overall wall thickness of the raw coal bunker in real time, calculate the structural strength safety margin of the raw coal bunker, effectively prevent major accidents such as the collapse of the raw coal bunker, reduce economic losses of thermal power plants, and reduce the risk of personal injury.

[0012] A safety early warning system for raw coal bunkers in thermal power plants includes: The data measurement module is used to obtain the wall thickness of each layer of the raw coal bunker in a thermal power plant based on multiple measurement points. The warning condition setting module is used to set a predetermined threshold when the remaining wall thickness of the current layer is less than the designed wall thickness when a predetermined proportion of measurement points in any layer are measured. The current layer is then determined to meet the warning condition. The warning level determination module is used to count the number of layers that meet the warning conditions: when the number of layers that meet the warning conditions is 1, the current working condition is determined to be a level 3 warning; when the number of layers that meet the warning conditions is greater than 1 but less than the total number of layers, the current working condition is determined to be a level 2 warning; when the number of layers that meet the warning conditions is equal to the total number of layers, the current working condition is determined to be a level 1 warning.

[0013] A terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the methods described in this invention.

[0014] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the methods described in this invention.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a safety early warning method for raw coal bunkers in thermal power plants. By detecting multiple layers of measurement points, the wall thickness data of each layer of the raw coal bunker can be obtained in a timely manner, making the previously unpredictable wall thickness reduction rate quantifiable. First, early warning conditions are set based on a predetermined proportion and a predetermined threshold for each layer. Then, the data from all layers are used to further classify the safety early warning, which facilitates the selection of different response measures for different early warning levels. This avoids the waste of resources caused by excessive maintenance and prevents the accident risks caused by insufficient maintenance. The method disclosed in this invention can monitor the overall wall thickness of the raw coal bunker in real time, calculate the structural strength safety margin of the raw coal bunker, effectively prevent major accidents such as the collapse of the raw coal bunker, reduce economic losses of thermal power plants, and reduce the risk of personal injury. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a topology diagram of the coal bunker safety early warning system of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 This invention discloses a safety early warning method for raw coal bunkers in thermal power plants. In this embodiment, the lower conical cylinder of the raw coal bunker is generally lined with stainless steel and high-manganese steel inner plates, preventing corrosion and wear from penetrating deep into the outer cylinder. Therefore, this patent primarily addresses the safety risks associated with wear or corrosion thinning of the upper cylindrical cylinder of the raw coal bunker, and designs a raw coal bunker safety early warning system. The system topology diagram is shown below. Figure 1As shown, the system mainly includes: 1) wall thickness probes; 2) wireless gateways; 3) software clients; and 4) a data processing center. N layers of wall thickness probes are installed on the upper cylinder of the raw coal bunker to measure the remaining wall thickness. The total number of probe layers N is selected based on the actual situation, such as the size of the raw coal bunker and the usual upper bunker height. M probes are arranged along the circumference of each layer, which can be evenly distributed or selected for key areas. The number of probes per layer can also be selected based on the actual situation, such as the available space. Based on the measurement principle, mature traditional ultrasonic probes or electromagnetic ultrasonic probes can be used. The wireless gateway uses a 2.4G / 5G wireless industrial gateway to transmit the remaining wall thickness data collected by the sensors to the data processing center for unified storage, processing, and intelligent analysis. It generates a wall thickness reduction rate trend chart and a remaining wall thickness distribution chart, and provides online early warnings as needed. The early warning scheme is described below. The software client is intended for power plant professionals. Its main function is to issue early warning prompts and can also display the remaining wall thickness status from multiple dimensions.

[0025] Based on the obtained remaining wall thickness data, a safety early warning system for the raw coal bunker is constructed. Referring to the boiler furnace safety monitoring system in thermal power plants, a safety early warning method for the raw coal bunker is set up. Taking an octagonal tangential combustion boiler furnace as an example, assuming the boiler has 5 coal mills corresponding to 5 layers of burners, then a typical furnace fire extinguishing protection system setup is as follows: (1) Layer flame loss trips the coal mill protection. For each layer of 8 corner burners, if 6 corner burners are extinguished (assuming the flame detection simulation value is less than 20%, the burner in that corner is considered to be extinguished), then the burner in that layer is considered to be extinguished, and the corresponding coal mill is tripped.

[0026] (2) Rapid load reduction protection. When more than two burners are extinguished, i.e., more than two coal mills trip, the unit's rapid load reduction function is triggered to match the load on the boiler side and the turbine side.

[0027] (3) Full furnace fire suppression protection. When all five burners are identified as fire extinguished, the boiler triggers the total fuel trip protection. These three levels of protection correspond to the three accident states of the boiler, and they progress step by step, with the fire extinguishing of the coal mill being the least severe and the fire suppression of the entire furnace being the most severe.

[0028] Specifically, the following steps are included: This embodiment discloses a safety early warning method for raw coal bunkers in thermal power plants, including the following steps: Step 1: Given multiple measurement points, obtain the wall thickness of each layer of the raw coal bunker in the thermal power plant based on the multiple measurement points; Specifically, this includes: arranging multiple probes on each layer of the raw coal bunker cylinder, with multiple probes forming multiple measurement points.

[0029] Furthermore, in this embodiment, the probe is an ultrasonic probe or an electromagnetic ultrasonic probe.

[0030] Step 2: If the remaining wall thickness of the current layer is less than the predetermined threshold of the designed wall thickness when a predetermined proportion of measurement points in any layer is set, the current layer is determined to meet the warning condition. Furthermore, in this embodiment, when a predetermined percentage of measurement points in any layer find that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, it is determined that the current layer meets the warning condition that the number of the predetermined percentage of measurement points is greater than or equal to 75% of all measurement points in the layer. The predetermined threshold is less than 20% of the designed wall thickness.

[0031] Step 3: Count the number of layers that meet the early warning conditions: When the number of layers that meet the early warning conditions is 1, the current operating condition is determined to be a Level 3 early warning. When the number of layers that meet the early warning conditions is greater than 1 and less than the total number of layers, the current working condition is determined to be a Level 2 early warning. When the number of layers that meet the early warning conditions equals the total number of layers, the current operating condition is determined to be a Level 1 early warning.

[0032] Furthermore, in this embodiment, different early warning measures are formulated according to different levels of early warning.

[0033] Based on the above method, the present invention discloses two specific embodiments: Example 1 In this embodiment, each wall thickness probe is considered as a burner, the remaining wall thickness is considered as the flame detection simulation quantity of the burner, and the safety status of the raw coal bunker is considered as the safety status of the boiler furnace, thereby formulating a safety early warning scheme for the raw coal bunker.

[0034] This embodiment uses the installation of 5 layers of wall thickness probes, with 8 probes in each layer as an example: (1) Level III warning.

[0035] If 6 or more of the 8 probes on a certain floor measure a remaining wall thickness less than 20% of the design wall thickness, it is considered a Level III warning. The number of Level III warnings is recorded, and power plant professionals are reminded to arrange for maintenance and replacement within one month.

[0036] (2) Level II warning.

[0037] If the remaining wall thickness measured by probes at two or more layers reaches the Level III warning condition, that is, if the number of Level III warnings is ≥2, it is identified as a Level II warning, and power plant professionals are reminded to conduct safety inspections and replacements within one week.

[0038] (3) Level I warning.

[0039] When the remaining wall thickness measured by all 5 probes reaches the Level III warning condition, that is, the number of Level III warnings is equal to 5, it is identified as a Level I warning, and at the same time, the power plant professionals are reminded to stop the mill for maintenance and replacement as soon as possible.

[0040] Example 2 When the number of probe layers and the number of probes per layer change, the above scheme can be slightly modified according to the actual situation. For example, if a total of 4 probe layers are set up, with 6 probes per layer, the scheme becomes: (1) Level III warning.

[0041] If four or more of the six sensors on a certain floor measure a remaining wall thickness less than 20% of the designed wall thickness, it is considered a Level III warning.

[0042] (2) Level II warning.

[0043] If the remaining wall thickness measured by probes at two or more layers meets the conditions for a Level III warning, it is considered a Level II warning.

[0044] (3) Level I warning.

[0045] When the remaining wall thickness measured by all four layers of probes meets the Level III warning criteria, it is considered a Level I warning. The number of probe layers and the number of probes per layer can be similarly adjusted as needed.

[0046] This invention utilizes an array of ultrasonic probes to monitor the remaining wall thickness of the raw coal bunker cylinder online. Based on the remaining wall thickness values ​​of different locations, a raw coal bunker safety early warning system is designed, which classifies the safety risks of the raw coal bunker into levels. This system provides real-time early warning prompts to power plant professionals and can effectively prevent raw coal bunker leakage and collapse accidents.

[0047] This embodiment also discloses a safety early warning system for raw coal bunkers in thermal power plants, including: The data measurement module is used to obtain the wall thickness of each layer of the raw coal bunker in a thermal power plant based on multiple measurement points. The warning condition setting module is used to set a predetermined threshold when the remaining wall thickness of the current layer is less than the designed wall thickness when a predetermined proportion of measurement points in any layer are measured. The current layer is then determined to meet the warning condition. The warning level determination module is used to count the number of layers that meet the warning conditions: when the number of layers that meet the warning conditions is 1, the current working condition is determined to be a level 3 warning; when the number of layers that meet the warning conditions is greater than 1 but less than the total number of layers, the current working condition is determined to be a level 2 warning; when the number of layers that meet the warning conditions is equal to the total number of layers, the current working condition is determined to be a level 1 warning.

[0048] By detecting multiple measurement points, the wall thickness data of each layer of the raw coal bunker in a thermal power plant can be obtained in a timely manner, making the previously unpredictable wall thickness reduction rate quantifiable. First, warning conditions are set based on a predetermined proportion and threshold for each layer. Then, further safety warning classification is performed using data from all layers, which facilitates the selection of different response measures for different warning levels. This avoids the waste of resources caused by over-maintenance and prevents the accident risks caused by insufficient maintenance. The method disclosed in this invention can monitor the overall wall thickness of the raw coal bunker in real time, calculate the structural strength safety margin of the raw coal bunker, effectively prevent major accidents such as the collapse of the raw coal bunker, reduce economic losses of thermal power plants, and reduce the risk of personal injury.

[0049] A schematic diagram of a terminal device according to an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0050] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0051] The terminal device can be a desktop computer, laptop computer, cloud server, or other device with strong computing power. The terminal device may include, but is not limited to, a processor and memory.

[0052] The optimal choice for the processor is a multi-core high-speed central processing unit (CPU).

[0053] The memory can be used to store the computer program and / or module. The processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0054] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A safety early warning method for raw coal bunkers in thermal power plants, characterized in that, Includes the following steps: Given multiple measurement points, obtain the wall thickness of each layer in the raw coal bunker of a thermal power plant based on these measurement points. If, in any given layer, a predetermined proportion of measurement points find that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, then the current layer is deemed to meet the warning conditions. The number of layers that meet the early warning criteria: When the number of layers that meet the early warning conditions is 1, the current working condition is determined to be a Level 3 early warning. When the number of layers that meet the early warning conditions is greater than 1 and less than the total number of layers, the current working condition is determined to be a Level 2 early warning. When the number of layers that meet the warning conditions equals the total number of layers, the current operating condition is determined to be a Level 1 warning.

2. The method for safety early warning of raw coal bunkers in thermal power plants according to claim 1, characterized in that, When a predetermined proportion of measurement points in any given layer find that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, the current layer is determined to meet the warning conditions, including: The number of predetermined proportion measurement points is greater than or equal to 75% of all measurement points on this floor.

3. The method for safety early warning of raw coal bunkers in thermal power plants according to claim 2, characterized in that, When a predetermined proportion of measurement points in any given layer determine that the remaining wall thickness of the current layer is less than a predetermined threshold of the designed wall thickness, the current layer is deemed to meet the warning conditions, including: The predetermined threshold is less than 20% of the designed wall thickness.

4. The method for safety early warning of raw coal bunkers in thermal power plants according to claim 1, characterized in that, The process of obtaining the wall thickness of each layer of the raw coal bunker in a thermal power plant based on multiple measurement points includes: Multiple probes are arranged on each layer of the raw coal bunker cylinder, forming multiple measurement points.

5. A safety early warning method for raw coal bunkers in thermal power plants according to claim 4, characterized in that, The probe is an ultrasonic probe or an electromagnetic ultrasonic probe.

6. A safety early warning method for raw coal bunkers in thermal power plants according to claim 4, characterized in that, Six or eight probes are placed on each layer of the raw coal bunker cylinder.

7. A safety early warning method for raw coal bunkers in thermal power plants according to claim 1, characterized in that, It also includes developing different early warning measures based on different levels of alert.

8. A safety early warning system for raw coal bunkers in thermal power plants, characterized in that, include: The data measurement module is used to obtain the wall thickness of each layer of the raw coal bunker in a thermal power plant based on multiple measurement points. The warning condition setting module is used to set a predetermined threshold when the remaining wall thickness of the current layer is less than the designed wall thickness when a predetermined proportion of measurement points in any layer are measured. The current layer is then determined to meet the warning condition. The warning level determination module is used to count the number of layers that meet the warning conditions: when the number of layers that meet the warning conditions is 1, the current working condition is determined to be a level 3 warning; when the number of layers that meet the warning conditions is greater than 1 and less than the total number of layers, the current working condition is determined to be a level 2 warning. When the number of layers that meet the warning conditions equals the total number of layers, the current operating condition is determined to be a Level 1 warning.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-7.

Images