Monitoring device for detecting real-time temperature of boiler furnace of coal-fired power plant

Abstract

The utility model provides a monitoring device for detecting the real-time temperature of a boiler hearth of a coal-fired power plant, the boiler is provided with a water cooling wall, the monitoring device comprises an analysis module and a sampling assembly, the sampling assembly comprises a first sampling assembly, a second sampling assembly and a third sampling assembly, and the first sampling assembly, the second sampling assembly and the third sampling assembly are used for measuring the temperatures of the hearth at different heights. The first sampling assembly, the second sampling assembly and the third sampling assembly respectively comprise a plurality of sensors, the sensors are respectively and electrically connected to the analysis module, the sensors partially penetrate through mounting holes of the water cooling wall and are fixed on the water cooling wall, and the sensors are sapphire fiber grating temperature sensors. The length of the hollow fiber is 60-120 cm, and the diameter of the hollow fiber is 6-10 mm. A sapphire fiber grating temperature sensor is adopted, the sampling precision is high, high temperature resistance is achieved, plug-and-play and rapid connection are achieved during installation, the temperature in a hearth can be visually reflected, and on-site real-time test data are provided for boiler combustion performance optimization and adjustment.

Description

Technical Field

[0001] This application relates to the field of real-time temperature monitoring technology for boiler furnaces in coal-fired power plants, specifically, to a monitoring device for detecting the real-time temperature of boiler furnaces in coal-fired power plants. Background Technology

[0002] Traditional energy sources offer greater safety and reliability than new energy sources, ensuring their continued dominance for some time. However, with national restrictions on nitrogen oxide emissions from power plants, effective technologies to reduce these emissions are a key focus for power plants. Currently, most power plants use coal-fired boilers, typically employing thermocouples to measure and control boiler temperature. However, this method suffers from low measurement accuracy, errors, and poor positioning, hindering accurate control of combustion efficiency. This results in lower boiler operating efficiency, increased coal consumption, reduced economic benefits, and potential safety hazards. Boiler combustion optimization technology, capable of effectively improving unit operating efficiency, reducing power generation costs, and lowering nitrogen oxide emissions, has garnered widespread attention from power generation companies.

[0003] Therefore, it is necessary to improve existing monitoring methods. Utility Model Content

[0004] To overcome the aforementioned shortcomings, the purpose of this application is to provide a monitoring device for detecting the real-time temperature of a boiler furnace in a coal-fired power plant. This monitoring device enables the real-time detection of the boiler furnace temperature, thereby effectively controlling combustion, preventing localized overheating and coking, reducing coal consumption, improving boiler operating efficiency and economy, and accurately and promptly detecting and addressing deviations from normal boiler furnace combustion conditions.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A monitoring device for detecting the real-time temperature of the furnace in a coal-fired power plant boiler, the boiler having water-cooled walls, the monitoring device comprising: an analysis module and a sampling component.

[0007] The sampling assembly includes a first sampling assembly, a second sampling assembly, and a third sampling assembly for measuring the temperature at different heights in the furnace. Each of the first, second, and third sampling assemblies includes multiple sensors, which are electrically connected to the analysis module. The sensor portions pass through mounting holes in the water-cooled wall and are fixed to the water-cooled wall.

[0008] The sensor is a tubular sapphire fiber Bragg grating temperature sensor, with a length between 60cm and 120cm and a diameter between 6 and 10mm. This design allows the sensor to be fixed to the water-cooled wall and partially located inside the furnace, enabling direct measurement of the furnace temperature and improving measurement accuracy.

[0009] Preferably, the sensor is a sapphire fiber grating temperature sensor with a length of 80cm and a diameter of 6mm.

[0010] Preferably, the boiler water-cooled wall includes four sides, which are combined in a cuboid shape. In the height direction, each side includes a first sampling component, a second sampling component, and a third sampling component, wherein the sensor of the first sampling component is located in the upper layer, the sensor of the second sampling component is located in the middle layer, and the sensor of the third sampling component is located in the lower layer, the lower layer being closer to the horizontal plane.

[0011] Preferably, the first sampling component includes at least one first sensor, the second sampling component includes at least one second sensor, and the third sampling component includes at least one third sensor.

[0012] The first sensor, the second sensor, and the third sensor are electrically connected to the analysis module.

[0013] Preferably, in the height direction, the first sensor, the second sensor, and the third sensor on each side are arranged in a straight line and are equally spaced.

[0014] Preferably, the sapphire fiber Bragg grating temperature sensor includes a tubular housing and an optical fiber with a grating. The optical fiber is disposed inside the hollow housing. A connecting part is provided on one side of the housing for fixing the sapphire fiber Bragg grating temperature sensor to the water-cooled wall.

[0015] Preferably, the housing is made of sapphire crystal.

[0016] Preferably, the connection part is a flange, through which the sapphire fiber grating temperature sensor is fixed to the fins of the water-cooled wall, and the axis of the sapphire fiber grating temperature sensor is parallel to the horizontal plane or the angle between the axis and the horizontal plane is less than 10°.

[0017] Preferably, the sensors included in the first sampling component, the second sampling component, and the third sampling component are of the same model.

[0018] Preferably, it further includes a hollow sleeve, the axial length of which is greater than the thickness of the fins of the water-cooled wall.

[0019] The sleeve is embedded in the mounting hole of the fin, and the axis of the sleeve is parallel to the horizontal plane or the angle between the axis of the sleeve and the horizontal plane is less than 10°.

[0020] Preferably, the sleeve is embedded in the mounting hole and protrudes from the fin, extending towards the furnace side, and the sleeve is welded and fixed to the fin.

[0021] The sapphire fiber Bragg grating temperature sensor passes through the sleeve and protrudes from it to extend into the furnace chamber. This allows for plug-and-play sensor connection, reducing maintenance costs and complexity.

[0022] Beneficial effects

[0023] The monitoring device proposed in this application uses a sapphire fiber Bragg grating temperature sensor, which features high sampling accuracy, high temperature resistance, and plug-and-play installation for quick connection. It can directly reflect the temperature changes in the boiler furnace, providing real-time on-site test data for optimizing boiler combustion performance. The separately configured sapphire fiber Bragg grating temperature sensor allows for individual maintenance, reducing maintenance costs and complexity. Attached Figure Description

[0024] The accompanying drawings are provided to illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this application.

[0025] Figure 1 The diagram shown is a topological schematic of the monitoring device according to an embodiment of this application.

[0026] Figure 2 The diagram shown is a schematic of the monitoring device of this application installed in the boiler furnace.

[0027] Figure 3 The diagram shown is a structural schematic of a sapphire fiber optic temperature sensor according to an embodiment of this application.

[0028] Figure 4 The image shown is a top view of a sapphire fiber optic temperature sensor installed on a water-cooled wall, according to an embodiment of this application.

[0029] Figure 5 The diagram shown is a schematic of the sensor installed on the water-cooled wall according to an embodiment of this application. Detailed Implementation

[0030] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0031] In this application, the terms "upper," "lower," "inner," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Currently, most power plants use thermal power generation. During boiler operation, thermocouples are used to measure the furnace temperature and control the boiler operation. However, using thermocouples for detection has problems such as low measurement accuracy and poor positioning effect, which affects the accurate control of the boiler's combustion efficiency and results in low boiler operating efficiency.

[0033] Therefore, the applicant has improved the current testing methods to enhance testing accuracy and provide strong reference data for optimizing boiler combustion.

[0034] Next, we will combine the appendix Figures 1-5 This application will describe in detail the monitoring device (hereinafter referred to as the monitoring device) proposed for detecting the real-time temperature of the furnace of a coal-fired power plant boiler.

[0035] like Figure 1 The diagram shows the topology of the monitoring device proposed in this application.

[0036] The monitoring device includes a resolution module 160 and a sampling component 10. The sampling component 10 may include a first sampling component, a second sampling component, and a third sampling component, which are used to collect temperature information at different heights in the furnace. The first sampling component, the second sampling component, and the third sampling component each include multiple sensors, and these sensors are electrically connected to the resolution module (such as a resolution instrument, such as a sapphire fiber Bragg grating demodulator).

[0037] / YOSC-MM-FBG-OE). The preferred sampling components use sensors of the same type. For example, the sampling component may employ a sapphire fiber Bragg grating temperature sensor, which offers high sampling accuracy and can operate stably for extended periods in ultra-high temperature environments up to 1800℃, is protected from lightning strikes and electromagnetic interference, and exhibits excellent temperature resistance, corrosion resistance, and aging resistance. The first sampling component includes multiple first sensors, the second sampling component includes multiple second sensors, and the third sampling component includes multiple third sensors. The first to third sensors are collectively referred to as sensors. The sapphire fiber Bragg grating temperature sensor is arranged in a columnar shape and inserted into a water-cooled wall (e.g., fixed to the water-cooled wall through mounting holes and partially extending into the furnace chamber; the sapphire fiber Bragg grating temperature sensor is parallel or approximately parallel to the horizontal plane).

[0038] like Figure 2 The diagram shown is a schematic of the monitoring device of this application used to detect the furnace temperature of a coal-fired power plant boiler (real-time detection).

[0039] The boiler 100 is equipped with a water-cooled wall, which is cuboid in shape, having four sides of 110 / 120 / 130 / 140. These four sides surround the boiler 100, and sensors are installed on each side at different heights (in the z-direction). In this embodiment, the boiler 100 furnace is divided into upper, middle, and lower layers. Four sampling points with approximately average distances are selected from each layer, for a total of 12 sampling points (in other embodiments, the number of sampling points is not limited; for example, the number of approximately average distanced sampling points in each layer of the furnace could be 8 or 12).

[0040] In the z-direction, each side includes three mounting holes 151 / 152 / 153 at different heights (e.g., mounting hole 151 is provided circumferentially on the upper layer of the furnace, mounting hole 152 is provided circumferentially on the middle layer, and mounting hole 153 is provided circumferentially on the lower layer; the diameter of mounting holes 151 / 152 / 153 is between 6mm and 12mm). These holes are used to mount sensors 200 (their models can be the same). One sensor is installed on each of the four sides of the water-cooled wall at the same height, for a total of four sensors. In this embodiment, 12 sensors are used, arranged in three layers. In other embodiments, two or more (e.g., three, four, or other numbers, depending on the application) sensors are installed on each of the four sides of the water-cooled wall at the same height. The sensor is a sapphire fiber Bragg grating temperature sensor, with a length between 60cm and 120cm and a diameter between 6 and 10mm. In this embodiment, the sapphire fiber Bragg grating temperature sensor is 80cm long and 6mm in diameter.

[0041] During installation, a mounting hole (e.g., an 8mm diameter hole) is made in the water-cooled wall. The sapphire fiber optic temperature sensor is passed through this hole and fixed to the water-cooled wall (extending along the height direction, in the z-direction, such as within the fins of the water-cooled wall). The sapphire fiber optic temperature sensor is cylindrical / tubular, with its axis parallel or approximately parallel to the horizontal plane (the angle with the horizontal plane is less than 10°). This sapphire fiber optic temperature sensor extends deep into the boiler furnace, allowing direct measurement of the real-time temperature inside the furnace during boiler operation. This improves measurement accuracy, effectively controls combustion, prevents localized overheating and coking, reduces coal consumption, improves boiler operating efficiency and economy, and accurately and promptly detects and addresses deviations from normal boiler furnace combustion conditions.

[0042] Preferably, the three sensors 200 on each side are aligned in a straight line along the height direction (z-direction), with equal distances between them, forming a sensor group. Each of the three sensors 200 on each side is connected to a resolution module 160 (such as a sapphire fiber grating demodulator, model YOSC-MM-FBG-OE), which can be housed in a control cabinet (not shown). This allows for individual maintenance of each sensor, reducing maintenance costs and complexity. In this embodiment, the first sampling component includes four sensors 200, the second sampling component includes four sensors 200, and the third sampling component includes four sensors 200. One sensor is installed on the upper, middle, and lower layers of each side of the boiler to collect the temperature of the upper, middle, and lower layers (within the furnace). In other embodiments, two or more sensors are installed on the upper, middle, and lower layers of each side (i.e., two or more sensors can be installed at the same height on each side).

[0043] like Figure 3 The diagram shown is a structural schematic of a sapphire fiber optic temperature sensor according to an embodiment of this application.

[0044] The sapphire fiber Bragg grating temperature sensor 200 includes a housing 210, an optical fiber 240 with a grating disposed within the housing 210 and protruding from it, a sensing head 220 disposed on one side of the protruding housing 210, and a connecting part 230 (such as a flange) disposed on the other side of the housing 210, through which the sapphire fiber Bragg grating temperature sensor is fixed to a water-cooled wall. Its length L is between 60cm and 120cm. Preferably, the diameter of the housing 210 is between 6-10mm. The testing principle of the sapphire fiber Bragg grating temperature sensor in practical applications is to accurately measure temperature changes by monitoring the drift of the Bragg wavelength. The specific steps are as follows: a grating is etched onto the sapphire optical fiber, and the location of the grating is the sensing point. To protect the fiber structure, prevent contamination and damage, improve measurement accuracy and stability, and ensure easier installation and maintenance, the housing is hollow and made of sapphire. A top view of the sapphire fiber Bragg grating temperature sensor (hereinafter referred to as the sensor) 200 installed on a water-cooled wall is shown below. Figure 4 As shown.

[0045] See Figure 5 The water-cooled wall includes water-cooled fireplace tubes 111, which are connected by fins 112. A sensor 200 partially passes through the fins 112 and is fixed to the fins 112 (e.g., via a connector 230). In one embodiment, the width of the fins 112 is between 13-20 mm (e.g., 15 mm), and the specifications of the water-cooled fireplace tubes 111 are Ф38*6.5 mm. An insulation layer (not shown) is provided on the side of the water-cooled wall away from the furnace.

[0046] In one implementation, see continue to see Figure 5 The fin 112 is provided with mounting holes (e.g., mounting holes with a diameter of 10mm). These mounting holes are embedded into the sleeve 300 (e.g., the sleeve is embedded into the fin 112 to a depth of 40mm (partially located on the furnace side / inside the furnace)). The axial length of the sleeve 300 is greater than the thickness h of the fin 112. The sleeve is welded and fixed to the fin 112. The sensor 200 (with the sensing head side) passes through the sleeve 300 (the inner diameter of the sleeve 300 is slightly larger than the outer diameter of the sensor 200, e.g., the inner diameter of the sleeve 300 is 8mm and the outer diameter of the sensor 200 is 6mm), and partially... The sleeve 300 protrudes into the furnace and is fixed to the sleeve 300 via the connecting part 230, allowing for plug-and-play, quick connection of the sensor during installation. Located inside the furnace, the sensor directly measures the real-time temperature. By placing sensors at different heights within the furnace (circumferentially at the upper, middle, and lower layers), precise temperature measurement can be achieved, providing real-time on-site test data for optimizing boiler combustion performance and reducing maintenance costs. Preferably, the axis of the sleeve 300 is parallel to the horizontal plane, or the angle between the axis of the sleeve and the horizontal plane is less than 10°.

[0047] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.

Claims

1. A monitoring device for detecting the real-time temperature of the furnace in a coal-fired power plant boiler, characterized in that: The coal-fired power plant boiler has water-cooled walls. The monitoring device includes: an analysis module and a sampling component. The sampling assembly includes a first sampling assembly, a second sampling assembly, and a third sampling assembly for measuring the temperature at different heights in the furnace. Each of the first, second, and third sampling assemblies includes multiple sensors, which are electrically connected to the analysis module. The sensor portions pass through mounting holes in the water-cooled wall and are fixed to the water-cooled wall. The sensor is a tubular sapphire fiber optic temperature sensor with a length between 60cm and 120cm and a diameter between 6 and 10mm.

2. The monitoring device as described in claim 1, characterized in that: The sapphire fiber optic temperature sensor is 80cm long and 6mm in diameter.

3. The monitoring device as described in claim 1 or 2, characterized in that: The boiler water-cooled wall includes four sides, which are combined into a cuboid shape. In the height direction, each side includes a first sampling component, a second sampling component, and a third sampling component. The sensor of the first sampling component is located in the upper layer, the sensor of the second sampling component is located in the middle layer, and the sensor of the third sampling component is located in the lower layer, with the lower layer being closer to the horizontal plane.

4. The monitoring device as described in claim 3, characterized in that: The first sampling component includes at least one first sensor, the second sampling component includes at least one second sensor, and the third sampling component includes at least one third sensor. The first sensor, the second sensor, and the third sensor are electrically connected to the analysis module.

5. The monitoring device as described in claim 4, characterized in that: In the height direction, the first, second, and third sensors on each side are arranged in a straight line and at equal intervals.

6. The monitoring device as described in claim 1, characterized in that: The sapphire fiber Bragg grating temperature sensor includes a tubular housing and an optical fiber with a grating. The optical fiber is disposed inside the hollow housing. A connecting part is provided on one side of the housing for fixing the sapphire fiber Bragg grating temperature sensor to the water-cooled wall.

7. The monitoring device as described in claim 6, characterized in that: The casing is made of sapphire.

8. The monitoring device as described in claim 6, characterized in that: The connecting part is a flange, through which the sapphire fiber grating temperature sensor is fixed to the fins of the water-cooled wall. The axis of the sapphire fiber grating temperature sensor is parallel to the horizontal plane or the angle between the axis and the horizontal plane is less than 10°.

9. The monitoring device as described in claim 1, characterized in that: It also includes a hollow sleeve, the axial length of which is greater than the thickness of the fins of the water-cooled wall. The sleeve is embedded in the mounting hole of the fin, and the axis of the sleeve is parallel to the horizontal plane or the angle between the axis of the sleeve and the horizontal plane is less than 10°.

10. The monitoring device as described in claim 9, characterized in that: The sleeve is embedded in the mounting hole and protrudes from the fin, extending towards the furnace side. The sleeve is welded and fixed to the fin. The sapphire fiber grating temperature sensor passes through the sleeve and protrudes from the sleeve to extend into the furnace chamber.

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