Flue inner bottom wall ash deposition thickness monitoring assembly
By setting multiple temperature sensors and support frames on the inner bottom wall of the flue, the thickness of ash accumulation in the flue gas outlet section in the flue is monitored, and the problems of inaccurate and high cost of flue ash monitoring in the prior art are solved, thus achieving high efficiency , stable monitoring of ash accumulation in flue and reduce energy consumption.
Patent Information
- Application Number
- CN202420708151.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-08
AI Technical Summary
The existing technology is difficult to effectively monitor and evaluate the thickness and distribution of ash accumulated in the flue gas outlet section in the flue duct, resulting in flue blockage, increased energy consumption and safety hazards, especially in high temperature and high dust environments, the measurement data is inaccurate or deviated. The existing method High cost and poor operationality.
Multiple diaphragm temperature sensors are installed on the inner bottom wall of the flue to monitor the depth of gray accumulation through temperature changes, combine matrix distribution and redundant design to improve monitoring accuracy and system stability, and use support frames to avoid negative pressure deformation, simplify wiring and Install.
It realizes convenient multi-point monitoring of the thickness of gray accumulation in the bottom wall of the flue, improves measurement accuracy and system stability, reduces energy consumption and operating costs, and avoids flue blockage and safety hazards.
Smart Images
Figure CN222279706U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of flue equipment, and in particular relates to a monitoring assembly for the dust accumulation thickness of the bottom wall of a flue. Background Art
[0002] In order to solve the problem of serious flue ash accumulation caused by the long-term operation of existing coal-fired boilers at medium and low loads, especially the deep peak-shaving operation of coal-fired power plants, especially the serious ash accumulation in the flue gas outlet section, which affects the safety of continuous operation of the boiler, and the flue ash accumulation will cause the flue to be blocked, the flue wind resistance will increase, and then the induced draft fan will increase energy consumption, and serious ash accumulation will also cause the flue to collapse, causing serious safety problems. Flue ash accumulation generally occurs at the corners of the flue and the bottom of the flue gas outlet section. For ash accumulation at the corners of the boiler flue, in actual applications, an ash hopper is generally used to unload and transport the ash to reduce flue ash accumulation. However, for ash accumulation at the bottom of the flue gas outlet section, due to its large bottom area, it is impossible to deploy ash hoppers on a large scale. Flow field analysis and optimization design are often used to avoid flue ash accumulation. However, due to the influence of the support in the flue, the flow field in the flue is complex, and the flow field changes greatly under different unit loads and different smoke and wind speeds. In reality, there is no very effective monitoring method to evaluate the location of ash accumulation and the severity of ash accumulation. Therefore, during operation, the induced draft fan is often increased in operating frequency. , increase the smoke speed, and blow away the accumulated ash in the flue, but due to the existence of supports in the flue, some parts of the flue cannot be completely blown away or the ash accumulation is more serious after blowing, especially when the domestic power plants are in deep peak regulation, they cannot be effectively blown away, resulting in more serious ash accumulation. Air cannons are also used to spray the bottom of the flue, but because the horizontal flue distance is too long, the effective distance of the spraying is limited, the cost of laying air cannons is high, and the energy consumption and operating cost of the air source for the spraying are too high to be fully implemented. Some power plants can only operate "under load", which leads to a huge increase in energy consumption and operating costs for the power plants.There are many existing methods for real-time monitoring of flue ash accumulation in high-temperature flue gas environments, such as the visual method - using laser or infrared optics to measure the ash accumulation at the bottom of the flue; the sound wave method - using ultrasonic radar to measure the ash accumulation at the bottom of the flue; the pressure method - indirectly measuring the flue ash accumulation by measuring the change in flue gas resistance; the weighing method - using the flue bottom ash accumulation weighing method to measure the ash accumulation; the resistance method - using the flue bottom level meter method to measure the flue ash accumulation; the mechanical method - using a probe-type mechanical method to measure the flue ash accumulation; the radionuclide imaging method - using ray penetration to detect flue ash accumulation; and so on. These methods are more or less unsuitable for the on-site environment. For example: the method of using laser or infrared optics to measure the ash accumulation at the bottom of the flue cannot be used in a high smoke and dust environment, and the high content of dust in the flue gas will The laser detection of ash accumulation at the bottom of the flue will be blocked, resulting in inaccurate measurement data; the use of ultrasonic radar to measure ash accumulation at the bottom of the flue will also misjudge the high dust content in the flue gas, resulting in inaccurate measurement data; the method of indirectly measuring flue ash accumulation by measuring the change in flue gas resistance cannot adapt to the resistance changes caused by the frequent high and low changes in the unit boiler load, and the actual measured data will also be biased; the flue bottom ash accumulation weighing method is used to measure ash accumulation. Although the measured data is relatively accurate, it is impossible to measure the specific position of large-scale or large-area ash accumulation, and the high-speed or low-speed smoke wind in the flue will also cause measurement deviations in weighing; the flue bottom level meter method is used to measure flue ash accumulation because its measurement position is a point, and it is also impossible to accurately measure large-scale or large-area ash accumulation. A probe-rod mechanical method is used to measure flue ash accumulation. This method, like the flue bottom material level meter measurement method, can only measure a specific point position. At the same time, the flue is not suitable for large-area drilling for measurement, and the actual operability is poor. X-ray penetration imaging is used to detect flue ash accumulation, which has radionuclide safety issues and is expensive, high maintenance cost and difficult management. Utility Model Content
[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a flue bottom wall ash thickness monitoring assembly which has a simple structure and can conveniently measure the ash thickness in the flue gas outlet section.
[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a flue bottom wall ash thickness monitoring assembly, including a flue body, the flue body including a vertically arranged flue gas inlet section and an inclined downwardly arranged flue gas outlet section, the end of the flue gas outlet section with a higher horizontal height is connected to and communicated with the lower end of the flue gas inlet section, a plurality of smoke spray guns are arranged at laterally intervals on the upper end of the end of the flue gas outlet section with a higher horizontal height, the spray end of each of the smoke spray guns extends into the flue gas outlet section, a diaphragm-type temperature sensor is arranged on the inner bottom wall of the smoke gas outlet section, and the temperature sensor is electrically connected to the control terminal.
[0005] The beneficial effect of the above technical solution is that by arranging a temperature sensor on the inner bottom wall of the flue gas outlet section, the exhaust temperature in the flue is relatively constant, and after ash accumulates on the surface of the temperature sensor, the temperature value sensed by the temperature sensor is negatively correlated with the thickness of the ash covering it. Therefore, at this time, the depth of ash accumulation in the flue gas outlet section can be obtained based on the temperature value measured by the temperature sensor.
[0006] In the above technical solution, there are multiple temperature sensors, and multiple temperature sensors are evenly distributed on the inner bottom wall of the smoke outlet section. At least one temperature sensor is arranged on the inner side wall of the smoke outlet section, and the multiple temperature sensors are electrically connected to the control terminal.
[0007] The beneficial effect of the above technical solution is that: in this way, multiple temperature sensors arranged on the inner bottom wall of the smoke outlet section can be used to perform multi-point monitoring of the ash accumulation depth on the inner bottom wall of the smoke outlet section, so that the control terminal can obtain the ash accumulation depth distribution on the inner bottom wall of the smoke outlet section, and the temperature measured by the temperature sensor on the inner wall of the smoke outlet section is the real-time temperature of the smoke, which can further improve the monitoring accuracy of the temperature sensor on the inner bottom wall of the smoke outlet section. At the same time, the data measured by the temperature sensor on the inner bottom wall of the smoke outlet section with abnormal temperature measurement can also be compared to facilitate the control terminal to eliminate it.
[0008] In the above technical solution, at least one temperature sensor is disposed on each of the inner side walls on both sides of the smoke outlet section.
[0009] The beneficial effect of the above technical solution is that at least two temperature sensors on the inner wall of the smoke outlet section form a redundant design, which is conducive to improving the stability of the entire system.
[0010] In the above technical solution, a plurality of temperature sensors arranged on the inner bottom wall of the smoke outlet section are distributed in a matrix.
[0011] The beneficial effects of the above technical solution are: its structure is simple, and the monitoring points are evenly distributed, which is conducive to improving the credibility of measurement accuracy.
[0012] The above technical solution also includes cable substrates arranged in rows and / or columns on the inner bottom wall of the smoke outlet section, the temperature sensors on the inner bottom wall of the smoke outlet section are all arranged on the cable substrates and electrically connected to the cable substrates, and the cable substrates are electrically connected to the control terminal.
[0013] The beneficial effect of the above technical solution is that its structure is simple, thus making the internal wiring of the smoke outlet section simple.
[0014] In the above technical solution, at least one end of the cable substrate is bent to fit on the inner wall of the smoke outlet section, and the temperature sensor on the inner wall of the smoke outlet section is arranged on the cable substrate on the inner wall of the smoke outlet section.
[0015] The beneficial effect of the above technical solution is that the temperature sensor on the inner wall of the smoke outlet section can also be installed on the cable substrate, which makes the wiring more compact.
[0016] The angle between the smoke inlet section and the smoke outlet section in the above technical solution is 00-0°.
[0017] The beneficial effect of the above technical solution is that the soot can be blown out more conveniently along with the smoke outlet section.
[0018] A support frame is arranged inside the smoke outlet section in the above technical solution.
[0019] The beneficial effect of the above technical solution is that it can avoid deformation of the smoke outlet section caused by negative pressure at the inner edge of the smoke duct.
[0020] The support frame in the above technical solution has multiple groups of sub-support components, and the multiple groups of sub-support components are arranged at intervals along the length direction of the smoke outlet section, and the sub-support components are connected to the inner wall of the smoke outlet section.
[0021] The beneficial effect of the above technical solution is that it has a good supporting effect.
[0022] The sub-support assembly in the above technical solution includes multiple first support rods and multiple second support rods arranged in the smoke outlet section, the two ends of the first support rods are respectively connected to the inner top wall and the inner bottom wall of the smoke outlet section, one end of the second support rod is connected to the inner side wall of the smoke outlet section, and the other end thereof is connected to the inner top wall or the inner bottom wall of the smoke outlet section.
[0023] The beneficial effect of the above technical solution is that the sub-support assembly has a better supporting effect on the smoke outlet section. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a vertical view of the dust accumulation thickness monitoring assembly of the flue bottom wall described in the embodiment of the utility model;
[0025] Figure 2 It is a cross-sectional view of the flue described in the embodiment of the utility model;
[0026] Figure 3 for Figure 2 The enlarged view of point A in the middle;
[0027] Figure 4This is a perspective view of the flue after the support frame is removed in the embodiment of the utility model;
[0028] Figure 5 It is a structural schematic diagram of the sub-support assembly described in the embodiment of the utility model;
[0029] Figure 6 It is a schematic diagram of the arrangement of the cable substrate and the temperature sensor in the embodiment of the utility model.
[0030] In the figure: 1 flue body; 11 smoke inlet section; 12 smoke outlet section; 2 smoke spray gun; 3 temperature sensor; 3a first temperature sensor; 3b second temperature sensor; 4 control terminal; 5 cable substrate; 6 support frame; 61 sub-support assembly; 611 first support rod; 612 second support rod. DETAILED DESCRIPTION
[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0032] like Figure 1-Figure 3 As shown, the present embodiment provides a ash accumulation thickness monitoring assembly for the bottom wall of a flue, comprising a flue body 1, wherein the flue body 1 comprises a vertically arranged smoke inlet section 11 and a downwardly inclined smoke outlet section 12, wherein one end of the smoke outlet section 12 having a higher horizontal height is connected and communicated with the lower end of the smoke inlet section 11, and a plurality of smoke spray guns 2 are arranged at intervals along the lateral direction at the upper end of the end of the smoke outlet section 12 having a higher horizontal height, wherein the spray end of each of the smoke spray guns 2 extends into the smoke outlet section 12, and a diaphragm-type temperature sensor 3 is arranged on the inner bottom wall of the smoke outlet section 12, wherein the temperature sensor 3 is electrically connected to a control terminal 4, so that by arranging the temperature sensor on the inner bottom wall of the smoke outlet section, the exhaust gas temperature in the flue is relatively constant, and after the smoke accumulates on the surface of the temperature sensor, the temperature value sensed by the temperature sensor is negatively correlated with the thickness of the smoke covering the upper part thereof, so at this time, the depth of the smoke accumulation in the smoke outlet section can be obtained according to the temperature value measured by the temperature sensing.
[0033] like Figure 3 , Figure 4 and Figure 6As shown, in the above technical solution, there are multiple temperature sensors 3, and multiple temperature sensors 3 are evenly distributed on the inner bottom wall of the flue gas outlet section 12, and at least one temperature sensor 3 is arranged on the inner side wall of the flue gas outlet section 12, and multiple temperature sensors 3 are electrically connected to the control terminal 4, so that the ash accumulation depth of the inner bottom wall of the flue gas outlet section can be monitored at multiple points by multiple temperature sensors arranged on the inner bottom wall of the flue gas outlet section, so that the distribution of the ash accumulation depth on the inner bottom wall of the flue gas outlet section can be obtained by the control terminal, and the temperature measured by the temperature sensor on the inner side wall of the flue gas outlet section is the real-time temperature of the flue gas, which can further improve the monitoring accuracy of the temperature sensor on the inner bottom wall of the smoke outlet section, and at the same time, the data measured by the temperature sensor with abnormal temperature measurement on the inner bottom wall of the smoke gas outlet section can be compared, so as to facilitate the control terminal to eliminate it.
[0034] In the above technical solution, at least one temperature sensor 3 is provided on each of the inner walls on both sides of the smoke outlet section 12, so that at least two temperature sensors on the inner wall of the smoke outlet section form a redundant design, which is conducive to improving the stability of the entire system.
[0035] In the above technical solution, the plurality of temperature sensors 3 arranged on the inner bottom wall of the smoke outlet section 12 are distributed in a matrix, which has a simple structure and evenly distributed monitoring points, which is conducive to improving the reliability of the measurement accuracy.
[0036] The above technical solution also includes cable substrates 5 arranged in rows and / or columns on the inner bottom wall of the smoke outlet section 12. The temperature sensors 3 on the inner bottom wall of the smoke outlet section 12 are all arranged on the cable substrate 5 and electrically connected to the cable substrate 5. The cable substrate 5 is electrically connected to the control terminal 4. Its structure is simple, which makes the internal wiring of the smoke outlet section simple.
[0037] In the above technical solution, at least one end of the cable substrate 5 is bent to fit on the inner wall of the smoke outlet section 12, and the temperature sensor 3 on the inner wall of the smoke outlet section 12 is arranged on the cable substrate 5 on the inner wall of the smoke outlet section 12, so that the temperature sensor on the inner wall of the smoke outlet section can also be installed on the cable substrate, which makes its routing more compact.
[0038] Specifically, the cable substrate may be arranged as follows: Figure 4 or Figure 6As shown in, two cable substrates arranged in the transverse direction can be provided, and a plurality of cable substrates spaced apart in the transverse direction are arranged between the two cable substrates arranged in the transverse direction (i.e., the width direction of the smoke outlet section) in the longitudinal direction (i.e., the length direction of the smoke outlet section), and a plurality of first temperature sensors are evenly spaced apart on each cable substrate along its length direction, and both ends of at least one cable substrate are bent upward to the inner side wall of the smoke outlet section (and at least one second temperature sensor is arranged at the bent section).
[0039] In the above technical solution, the angle between the smoke inlet section 11 and the smoke outlet section 12 is 100-120° (preferably 105° or 110°), so that the smoke ash can be blown out more conveniently along the smoke outlet section.
[0040] See Figure 1 As shown, the smoke outlet section 12 in the above technical solution is provided with a support frame 6 (the support frame cannot affect the normal discharge of smoke in the flue), so as to avoid deformation of the smoke outlet section caused by negative pressure along the flue.
[0041] See Figure 2 As shown, the support frame 6 in the above technical solution has multiple groups of sub-support components 61, and the multiple groups of sub-support components 61 are arranged at intervals along the length direction of the smoke outlet section 12. The sub-support components 61 are connected to the inner wall of the smoke outlet section 12, and the supporting effect is good.
[0042] See Figure 5 As shown, the sub-support assembly 61 in the above technical solution includes a plurality of first support rods 611 and a plurality of second support rods 612 arranged in the smoke outlet section 12, the two ends of the first support rod 611 are respectively connected to the inner top wall and the inner bottom wall of the smoke outlet section 12, one end of the second support rod 612 is connected to the inner side wall of the smoke outlet section 12, and the other end is connected to the inner top wall or the inner bottom wall of the smoke outlet section 12, so that the sub-support assembly has a good supporting effect on the smoke outlet section. Figure 5 As shown, in this embodiment, each of the sub-support assemblies can be provided with three first support rods and four second support rods, wherein the three first support rods are vertically arranged and distributed in a lateral interval, the two first support rods on both sides are each matched with two second support rods and connected together to form a triangle, and the other ends of the two second support rods are connected to the inner side wall on the corresponding side of the smoke outlet section, so that the supporting effect of the entire sub-support assembly is better.
[0043] The control terminal described in this embodiment can be an industrial computer, which can be arranged in a control cabinet located outside the flue (the control cabinet can also be arranged on the outer wall of the flue), and a threading hole is arranged on the side wall of the flue for all conductive wires on the cable substrate to pass through to be electrically connected to the control terminal. The arrangement of the cable substrate and the temperature sensor is similar to the existing LED light strips on the market (a large number of LED wicks are arranged on the substrate of the light strip at intervals along its length direction, wherein the substrate of the light strip is equivalent to the cable substrate in this embodiment, and the LED wicks are equivalent to the temperature sensor).
[0044] The principle of this embodiment is that a large number of first temperature sensors are evenly distributed on the inner bottom wall of the smoke outlet section, and at least one second temperature sensor is set on the inner side wall of the smoke outlet section. The second temperature sensor is used to measure the real-time smoke temperature (it is possible to simulate the setting of ash deposits of different thicknesses on the inner bottom wall of the smoke outlet section under different smoke temperatures in advance, to obtain the sensing value of the first temperature sensor, and to know that the difference between the real-time measurement value of the first temperature sensor and the real-time temperature of the smoke is linearly related to the thickness of the ash deposit. At this time, a linear equation between the ash deposit thickness and the measurement value of the first temperature sensor under the corresponding smoke temperature conditions can be obtained). In addition, the second temperature sensor can also be used to measure the real-time smoke temperature. As a reference, when the measurement value of a first temperature sensor is obviously abnormal compared with the measurement values of other first temperature sensors or the second temperature sensor, the control terminal may automatically default the sensing value of the first temperature sensor to an invalid value. In addition, since the ash accumulation thickness at various locations on the inner bottom wall of the flue gas outlet section may be different, in this embodiment, a large number of first temperature sensors are arranged on the inner bottom wall of the flue gas outlet section. At this time, the control terminal can calculate the ash accumulation thickness at the corresponding first temperature sensor according to the temperature measurement values of each first temperature sensor and the temperature measurement values of the second temperature sensor, and finally form a distribution map of the ash accumulation thickness on the inner bottom wall of the flue gas outlet section on the control terminal.
[0045] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.
Claims
1. A monitoring assembly for the thickness of dust deposited on the bottom wall of a flue, comprising a flue body (1), the flue body (1) comprising a vertically arranged flue gas inlet section (11) and a downwardly inclined flue gas outlet section (12), the higher end of the flue gas outlet section (12) being connected to and in communication with the lower end of the flue gas inlet section (11), a plurality of smoke spray guns (2) being arranged at intervals along the lateral direction at the upper end of the higher end of the flue gas outlet section (12), the spray end of each of the smoke spray guns (2) extending into the flue gas outlet section (12), characterized in that: A diaphragm-type temperature sensor (3) is provided on the inner bottom wall of the smoke outlet section (12), and the temperature sensor (3) is electrically connected to the control terminal (4).
2. The flue bottom wall dust thickness monitoring assembly according to claim 1 is characterized in that: A plurality of the temperature sensors (3) are provided, and the plurality of temperature sensors (3) are evenly distributed on the inner bottom wall of the smoke outlet section (12), and at least one temperature sensor (3) is provided on the inner side wall of the smoke outlet section (12), and the plurality of temperature sensors (3) are all electrically connected to the control terminal (4).
3. The flue bottom wall dust thickness monitoring assembly according to claim 2 is characterized in that: At least one temperature sensor (3) is disposed on each of the inner side walls on both sides of the smoke outlet section (12).
4. The flue bottom wall dust thickness monitoring assembly according to claim 2 is characterized in that: A plurality of temperature sensors (3) arranged on the inner bottom wall of the smoke outlet section (12) are distributed in a matrix.
5. The flue bottom wall dust thickness monitoring assembly according to claim 2 is characterized in that: It also comprises cable substrates (5) arranged in rows and / or columns on the inner bottom wall of the smoke outlet section (12); the temperature sensors (3) on the inner bottom wall of the smoke outlet section (12) are all arranged on the cable substrates (5) and are electrically connected to the cable substrates (5); and the cable substrates (5) are electrically connected to the control terminal (4).
6. The flue bottom wall dust thickness monitoring assembly according to claim 5 is characterized in that: The end of at least one of the cable substrates (5) is bent to fit on the inner wall of the smoke outlet section (12), and the temperature sensor (3) on the inner wall of the smoke outlet section (12) is arranged on the cable substrate (5) on the inner wall of the smoke outlet section (12).
7. The flue bottom wall dust thickness monitoring assembly according to any one of claims 1 to 6, characterized in that: The angle between the smoke inlet section (11) and the smoke outlet section (12) is 100-120°.
8. The flue bottom wall dust thickness monitoring assembly according to any one of claims 1 to 6, characterized in that: A support frame (6) is arranged inside the smoke outlet section (12).
9. The flue bottom wall dust thickness monitoring assembly according to claim 8 is characterized in that: The support frame (6) comprises a plurality of groups of sub-support assemblies (61), and the plurality of groups of sub-support assemblies (61) are arranged at intervals along the length direction of the smoke outlet section (12), and the sub-support assemblies (61) are connected to the inner wall of the smoke outlet section (12).
10. The flue bottom wall dust thickness monitoring assembly according to claim 9, characterized in that: The sub-support assembly (61) comprises a plurality of first support rods (611) and a plurality of second support rods (612) arranged in the smoke outlet section (12), wherein the two ends of the first support rod (611) are respectively connected to the inner top wall and the inner bottom wall of the smoke outlet section (12), and one end of the second support rod (612) is connected to the inner side wall of the smoke outlet section (12), and the other end thereof is connected to the inner top wall or the inner bottom wall of the smoke outlet section (12).