A coal powder conveying pipeline leakage monitoring device and system

Abstract

The application provides a coal powder conveying pipeline leakage monitoring device and system, two adjacent conveying pipelines in the coal powder conveying pipeline are connected through two pipeline flanges; the leakage monitoring device comprises a cladding assembly, a first sealing ring and a flow guide identification assembly, the cladding assembly is tightly cladded outside the two adjacent pipeline flanges; the first sealing ring is sealingly arranged between the two adjacent pipeline flanges, and the first sealing ring, the two adjacent pipeline flanges and the cladding assembly form an annular cavity; the flow guide identification assembly is provided with a monitoring cavity, the monitoring cavity is communicated with the annular cavity, and the flow guide identification assembly is provided with a photosensitive identification element for identifying the coal powder in the monitoring cavity. The flow guide identification assembly has small flow resistance to the coal powder, the coal powder can easily enter the monitoring cavity along the airflow and be immediately identified, and the monitoring response speed is improved. The air tightness requirement of the cavity for the cladding assembly is not very high, so that the structure of the leakage monitoring device is simple, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of pulverized coal conveying pipeline technology, and in particular to a leakage monitoring device and system for pulverized coal conveying pipelines. Background Technology

[0002] In the coal chemical industry, pipelines are commonly used to transport pulverized coal. Due to the high working pressure within these pipelines and the fact that the transport path passes through multiple devices and pipes, there is a risk of leakage at pipe connection flanges, elbows, and other points. Compared to ordinary pulverized coal, the pulverized coal used in coal chemical processes has lower moisture and ash content, and smaller particle size (generally below 90μm, with over 80% of the pulverized coal having a particle size smaller than 75μm). Once a leak occurs, the dust layer and dust cloud have lower ignition temperatures, lower ignition energy, and lower lower explosive limits, making them more prone to explosion. Furthermore, the maximum explosion pressure and the rate of pressure rise are significantly higher, resulting in greater destructive force and potentially causing more severe damage to other equipment, or even catastrophic accidents, leading to environmental pollution and enormous loss of life and property. Monitoring pulverized coal leakage using pressure monitoring methods is problematic. Firstly, pressure changes only occur when the leakage volume is large and the leakage time is long. Secondly, the required monitoring equipment is expensive, and the monitoring devices require high airtightness and pressure-resistant structural materials, further increasing costs. Summary of the Invention

[0003] The purpose of this invention is to provide a leakage monitoring device and system for pulverized coal conveying pipelines, so as to solve the safety problems caused by leakage when pulverized coal is conveyed through pipelines in the prior art.

[0004] The embodiments of the present invention adopt the following technical solution: a leakage monitoring device for a pulverized coal conveying pipeline, wherein two adjacent conveying pipelines in the pulverized coal conveying pipeline are connected by two pipeline flanges; the leakage monitoring device includes:

[0005] A covering assembly that tightly covers the outside of two adjacent pipe flanges;

[0006] The first sealing ring is disposed between two adjacent pipe flanges, and

[0007] The first sealing ring, together with the two adjacent pipe flanges and the covering assembly, forms an annular cavity;

[0008] A flow guiding and identification component has a monitoring cavity that is connected to an annular cavity body, and the flow guiding and identification component has a photosensitive identification element that identifies coal dust in the monitoring cavity.

[0009] In some embodiments, the traffic identification component includes:

[0010] A collecting pipe, which is a straight pipe, has a collecting cavity for collecting pulverized coal, a first port communicating with the collecting cavity is provided on the side wall of the collecting pipe, a second port communicating with the collecting cavity is provided at one end of the collecting pipe, and a third port communicating with the collecting cavity is provided at the other end of the collecting pipe.

[0011] A guide pipe having a guide cavity open at both ends, one end of the guide pipe communicating with the annular cavity and the other end connected to the first pipe opening, so as to guide the coal powder leaking from the conveying pipe into the annular cavity into the collection cavity;

[0012] A filter plate that is sealed at the second pipe opening, the filter plate having filter holes;

[0013] A photoelectric sensor is detachably and sealed at the third port, and the photosensitive end of the photoelectric sensor is located inside the focusing cavity.

[0014] In some embodiments, the covering assembly includes a second sealing ring and a covering housing;

[0015] The inner circumferential surface of the second sealing ring is sealed and attached to the outer circumferential surface of the two adjacent pipe flanges;

[0016] The outer casing covers the outer circumferential surface of the second sealing ring, and is used to tighten the second sealing ring to the outer circumferential surface of the pipe flange.

[0017] In some embodiments, the encapsulation shell includes a first encapsulation shell and a second encapsulation shell;

[0018] The inner shell surfaces of the first and second outer shells are respectively attached to the outer circumferential surface of the second sealing ring, and the first and second outer shells are detachably fixed.

[0019] In some embodiments, the second sealing ring is provided with a first through hole that extends radially through the second sealing ring;

[0020] The outer casing is provided with a second through hole arranged coaxially with the first through hole;

[0021] One end of the guide pipe is sealed at the second through hole, so that the coal powder in the annular cavity can enter the guide cavity in sequence through the first through hole and the second through hole.

[0022] In some embodiments, the flow guide is integral with the outer casing.

[0023] In some embodiments, the pipe flange is cylindrical, and two adjacent pipe flanges are respectively provided with annular bosses at their opposite ends. The two ends of the first sealing ring are respectively tightly abutted against the opposite surfaces of the two bosses; the outer peripheral surface of the bosses constitutes part of the cavity wall of the annular cavity.

[0024] In some embodiments, the mesh size of the filter pores is 80 to 200 mesh.

[0025] This invention also discloses a leakage monitoring system for pulverized coal conveying pipelines, including a data acquisition processor, a monitoring host, and a leakage monitoring device for pulverized coal conveying pipelines as described in any of the above embodiments;

[0026] The data acquisition processor is electrically connected to the flow identification component of the leakage monitoring device of the pulverized coal conveying pipeline to receive the monitoring signal of the flow identification component and convert the monitoring signal into a digital signal;

[0027] The monitoring host is connected to the data acquisition processor to receive the digital signals from the data acquisition processor and make corresponding feedback based on the digital signals.

[0028] In some embodiments, when a coal dust leak occurs in the conveying pipeline, the corresponding feedback includes at least indicating the location of the coal dust leak and issuing an alarm signal.

[0029] The beneficial effects of the embodiments of the present invention are as follows:

[0030] By installing a covering component, a first sealing ring, and a flow-guiding identification component at the flange connection of adjacent conveying pipelines, and with the flow-guiding identification component connected to an annular cavity formed by the first sealing ring, two adjacent pipeline flanges, and the covering component, coal dust in the conveying pipeline can enter the monitoring cavity of the flow-guiding identification component. This allows for the identification and monitoring of minute amounts of coal dust entering the monitoring cavity. Because the flow-guiding identification component offers minimal resistance to coal dust flow, the dust easily enters the monitoring cavity with the airflow and is immediately identified, resulting in a very fast monitoring response time—typically less than one second. This allows for early detection of pipeline leaks, enabling effective protective measures to be taken and preventing accidents. Furthermore, the covering component does not have particularly high requirements for cavity airtightness; minor leaks in the cavity have minimal impact on the flow-guiding identification component's monitoring, resulting in a simple and low-cost leak detection device. Additionally, the leak detection device does not have special requirements for the pressure resistance of the covering component and the flow-guiding identification component, further reducing the overall cost. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the leakage monitoring device of the present invention.

[0033] Figure 2 This is a schematic diagram of the cross-sectional structure of the leakage monitoring device of the present invention.

[0034] Figure 3 This is a schematic diagram of a delivery pipeline and a leakage monitoring device according to the present invention.

[0035] Figure 4 This is a schematic diagram of the cross-sectional structure of the flow guidance and identification component of the present invention.

[0036] Figure 5 This is another cross-sectional structural diagram of the flow guidance and identification component of the present invention.

[0037] Figure 6 This is a schematic diagram of the structure of the first and second outer casings of the present invention.

[0038] Figure 7 This is a schematic diagram of the structure of the second sealing ring of the present invention.

[0039] Figure 8 This is a schematic diagram of the leakage monitoring system of the present invention.

[0040] Attached reference numerals: 1. Conveying pipeline;

[0041] 2. Pipe flange; 201. Boss;

[0042] 3. Encasing component; 301. Second sealing ring; 3011. First through hole; 302. First encasing shell; 303. Second encasing shell; 304. Connecting hole; 305. Second through hole;

[0043] 4. First sealing ring;

[0044] 5. Flow guiding and identification component; 501. Gathering tube; 5011. Gathering cavity; 5012. First port; 5013. Second port; 5014. Third port; 5015. Extension tube; 502. Flow guiding tube; 5021. Flow guiding cavity; 503. Filter plate; 5031. Filter hole; 504. Photoelectric sensor;

[0045] 6. Cavity; 7. Bolt; 8. Nut; 9. Flange Bolt; 10. Flange Nut; 11. Data Acquisition Processor; 12. Monitoring Host. Detailed Implementation

[0046] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0047] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of the invention will be apparent to those skilled in the art.

[0048] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0049] These and other features of the invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0050] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features of the above-described "Summary of the Invention" and are therefore all within the scope of protection defined herein.

[0051] The above and other aspects, features and advantages of the invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0052] Specific embodiments of the invention are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the invention, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the foregoing "Summary of the Invention" to teach those skilled in the art to use the invention in various ways with substantially any suitable detailed structure.

[0053] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments of the present invention.

[0054] To address the problems in the background art, the present invention provides a leakage monitoring device for pulverized coal conveying pipelines.

[0055] Figure 1A schematic diagram of the leak monitoring device is shown.

[0056] Figure 2 A schematic diagram of the cross-sectional structure of the leak monitoring device is shown.

[0057] Figure 3 A schematic diagram of a delivery pipeline and a leak monitoring device is shown.

[0058] The coal powder conveying pipeline has multiple conveying pipe sections 1, and the various conveying pipe sections 1 need to be connected, for example, by combining... Figure 1 Two adjacent conveying pipes 1 are connected by two pipe flanges 2. Each conveying pipe 1 has a pipe flange 2 at both ends. When two adjacent conveying pipes 1 are connected by pipe flanges 2, the pipe flange 2 at one end of one conveying pipe 1 is connected to the pipe flange 2 at one end of the other conveying pipe 1 to realize the assembly between the conveying pipes 1.

[0059] Continue to combine Figure 1 , Figure 2 and Figure 3 The leak monitoring device includes a covering component 3, a first sealing ring 4, and a flow guiding and identification component 5.

[0060] Among them, the covering component 3 tightly covers the outside of the two adjacent pipe flanges 2.

[0061] The first sealing ring 4 is installed between two adjacent pipe flanges 2, and

[0062] The first sealing ring 4, together with the two adjacent pipe flanges 2 and the covering assembly 3, forms an annular cavity 6.

[0063] Specifically, the covering assembly 3 is located outside the two pipe flanges 2 and forms a sealed covering for the pipe flanges 2. The conveying pipe 1 may be, but is not limited to, a circular pipe. There is a certain distance between the two pipe flanges 2 connecting the two adjacent conveying pipes 1 along the centerline direction of the conveying pipe 1. The first sealing ring 4 is disposed between the two pipe flanges 2 to seal the two adjacent conveying pipes 1 assembled together. There is a certain distance between the first sealing ring 4 and the covering assembly 3 along the radial direction of the conveying pipe 1. Therefore, the first sealing ring 4, the two adjacent pipe flanges 2, and the covering assembly 3 can form an annular cavity 6. The inner wall surface of the annular cavity 6 includes the inner wall surface of the covering assembly 3, the outer peripheral surface of the first sealing ring 4, and the opposite end faces of the two pipe flanges 2. Since the pressure inside the conveying pipe 1 is greater than the pressure inside the annular cavity 6, for example, when the first sealing ring 4 is damaged or fatigued, affecting the sealing effect on the conveying pipe 1, the coal dust in the conveying pipe 1 will leak from the conveying pipe 1 into the annular cavity 6.

[0064] The flow guiding and identification component 5 has a monitoring chamber that can communicate with the external environment and is also connected to the annular cavity 6. Coal dust leaking into the annular cavity 6 will concentrate and enter the monitoring chamber. Because the flow guiding and identification component 5 offers low flow resistance to the coal dust, the coal dust easily enters the monitoring chamber with the airflow. The flow guiding and identification component 5 has a photosensitive identification element that identifies the coal dust in the monitoring chamber; this photosensitive identification element can be a photoelectric sensor 504. The coal dust entering the monitoring chamber can be quickly identified, resulting in a fast monitoring response speed for this leak detection device, typically less than one second. Therefore, this leak detection device can detect leaks in the conveying pipeline 1 early, allowing for effective protective measures to prevent safety accidents. Furthermore, the encapsulation component 3 does not have particularly high requirements for the airtightness of the cavity 6; minor leaks in the cavity 6 have little impact on the monitoring of the flow guiding and identification component 5, making the leak detection device simple in structure and low in cost. Moreover, the leak detection device does not have special requirements for the compressive strength of the encapsulation component 3 and the flow guiding and identification component 5, further reducing the cost of the leak detection device.

[0065] In one embodiment of the present invention, combined with Figure 4 The flow identification component 5 includes a gathering tube 501, a flow guide tube 502, a filter plate 503, and a photoelectric sensor 504.

[0066] Among them, combined again Figure 4 The collecting tube 501 is a straight tube with a collecting cavity 5011 for collecting pulverized coal. A first port 5012 communicating with the collecting cavity 5011 is provided on the side wall of the collecting tube 501. One end of the collecting tube 501 has a second port 5013 communicating with the collecting cavity 5011, and the other end has a third port 5014 communicating with the collecting cavity 5011. Of course, it is understood that the collecting tube 501 can be of other shapes, as long as it ensures that the light entering the collecting cavity 5011 through the second port 5013 can travel in a straight line to the third port 5014. A filter plate 503 or filter screen is provided at the second port 5013. Specifically, the filter plate 503 or filter screen seals the second port 5013, and the filter plate 503 has filter holes 5031 through which the collecting cavity 5011 can communicate with the external environment. The filter plate 503 or filter screen may, but is not limited to, have filter holes 5031 at the center of the filter screen. The aperture of the filter holes 5031 is very small. The coal powder in the collection cavity 5011 can flow out through the filter plate 503 or filter screen, but most of the coal powder particles are blocked by the filter plate 503 or filter screen. A layer of black coal powder will quickly (generally no more than 1 second) cover the filter plate 503 or filter screen. The black coal powder blocks the filter holes 5031, and light from the external environment cannot pass through the filter holes 5031 into the collection cavity 5011.

[0067] Combination Figure 5 The guide pipe 502 has a guide cavity 5021 with openings at both ends. One end of the guide pipe 502 is connected to the annular cavity 6, and the other end is connected to the first pipe port 5012 to guide the coal powder leaking from the conveying pipe 1 into the annular cavity 6 to the collecting cavity 5011. The guide cavity 5021 of the guide pipe 502 and the collecting cavity 5011 of the collecting pipe 501 form the monitoring cavity of the guide identification component 5. The diameter of the guide pipe 502 can be designed to be much smaller than the diameter of the conveying pipe 1. Because the collecting cavity 5011 is connected to the external environment, the coal powder entering the annular cavity 6 will flow rapidly and concentratedly into the guide pipe 502.

[0068] To facilitate the connection between the guide tube 502 and the collecting tube 501, an extension tube 5015 is provided on the side wall of the collecting tube 501, and a first port 5012 communicating with the collecting cavity 5011 is provided on the extension tube 5015. The other end of the guide tube 502 can be sealed and inserted into the extension tube 5015 or sealed and sleeved on the outside of the extension tube 5015.

[0069] The photoelectric sensor 504 is detachably and sealed at the third port 5014, and the photosensitive end of the photoelectric sensor 504 is located inside the focusing cavity 5011. When black coal dust blocks the filter hole 5031, preventing light from the external environment from entering the focusing cavity 5011 through the filter hole 5031, the light emitted by the photoelectric sensor 504 will be absorbed by the coal dust, and no light will return to the photoelectric sensor 504. Because the aperture of the filter hole 5031 is very small, even a small amount of coal dust leakage will cover the filter plate 503 or filter screen, resulting in a very fast response. If no coal dust leakage occurs, the filter plate 503 or filter screen will not cover the coal dust, and the light emitted by the photoelectric sensor 504 will be reflected back to the photoelectric sensor 504 by the filter plate 503 or filter screen.

[0070] The cost of the photoelectric sensor 504 is relatively low compared to components such as pressure sensors, thereby reducing the overall cost of the leak monitoring device.

[0071] In one embodiment of the present invention, again combined with Figure 1 and Figure 2 The covering component 3 includes a second sealing ring 301 and a covering shell.

[0072] The inner circumferential surface of the second sealing ring 301 is sealed and attached to the outer circumferential surface of two adjacent pipe flanges 2. The second sealing ring 301 has a relatively large length along the axial direction of the conveying pipe 1, ensuring that the second sealing ring 301 can completely cover the space corresponding to the spacing formed by the two pipe flanges 2 along the axial direction of the conveying pipe 1. Both the first sealing ring 4 and the second sealing ring 301 can be made of rubber.

[0073] The outer casing covers the outer circumferential surface of the second sealing ring 301, and is used to tighten the second sealing ring 301 to the outer circumferential surface of the pipe flange 2. The outer casing forms a circumferential enclosure and tightening effect on the second sealing ring 301, preventing the second sealing ring 301 from falling off the pipe flange 2. The outer casing can be made of metal or plastic.

[0074] In one embodiment of the present invention, combined with Figure 6 The outer casing includes a first outer casing 302 and a second outer casing 303.

[0075] The first outer casing 302 and the second outer casing 303 can be designed as semi-circular rings, and the inner shell surfaces of the first outer casing 302 and the second outer casing 303 are respectively attached to the outer circumferential surface of the second sealing ring 301. The first outer casing 302 and the second outer casing 303 are detachably fixed. Figure 6 Both ends of the first outer casing 302 and the second outer casing 303 can be provided with connecting portions, each with a connecting hole 304. Bolts 7 pass through the connecting holes 304 on the connecting portions of the first and second outer casings 302 and 303 respectively, and engage with nuts 8 to achieve detachable fixing of the first and second outer casings 302 and 303. Of course, it is understood that the outer casings can also adopt other structural forms, such as clamps. This is merely an example and does not constitute a limitation on the scope of the claims.

[0076] In one embodiment of the present invention, combined with Figure 3 and Figure 7 The second sealing ring 301 is provided with a first through hole 3011 that extends radially through the second sealing ring 301.

[0077] The outer casing is provided with a second through hole 305 arranged coaxially with the first through hole 3011. The diameter of the second through hole 305 may be, but is not limited to, the same as the diameter of the first through hole 3011. One or more first through holes 3011 may be provided so that when assembling the casing component 3, the position of the first through hole 3011 can be adjusted by adjusting the position of the second sealing ring 301, thereby achieving rapid alignment between the second through hole 305 and the first through hole 3011.

[0078] One end of the guide tube 502 is sealed at the second through hole 305. For example, the guide tube 502 can be welded and fixed at the second through hole 305, or a threaded connection can be used to achieve a detachable connection between the guide tube 502 and the second through hole 305. The guide tube 502, which communicates with the second through hole 305, allows the coal powder in the annular cavity 6 to enter the guide cavity 5021 sequentially through the first through hole 3011 and the second through hole 305.

[0079] In one embodiment of the present invention, the guide pipe 502 is integrated with the outer shell. The integrated structure of the guide pipe 502 and the outer shell can avoid the rapid assembly of the leakage monitoring device and also prevent the coal powder entering the annular cavity 6 from leaking from the connection between the guide pipe 502 and the outer shell.

[0080] In one embodiment of the present invention, the pipe flange 2 can be cylindrical, and two adjacent pipe flanges 2 are respectively provided with annular bosses 201 at their opposite ends. The two ends of the first sealing ring 4 are respectively tightly abutted against the opposite surfaces of the two bosses 201 to achieve sealing of the two adjacent conveying pipes 1. The outer peripheral surface of the bosses 201 forms part of the cavity wall of the annular cavity 6. The provision of the bosses 201 can enable the leakage monitoring device to have a relatively large or more obvious annular cavity 6.

[0081] The pipe flange 2 can be designed as an integral part of the conveying pipe 1 to prevent leakage at the connection between the pipe flange 2 and the conveying pipe 1. Two adjacent pipe flanges 2 can be connected by flange bolts 9 and flange nuts 10. The flange bolts 9 are only distinguished by the bolts and nuts used to connect the first enclosure 302 and the second enclosure 303. The flange bolts 9 can pass through the annular cavity 6, and the middle part of the flange bolts 9 can be located within the annular cavity 6.

[0082] In one embodiment of the present invention, in order to improve the response speed of the flow guiding and identification component 5 to coal powder leakage, the aperture of the filter hole 5031 of the filter plate 503 or filter screen can be set to be smaller, for example, the mesh size of the filter hole 5031 is 80 to 200 mesh. The high mesh size of the filter hole 5031 can allow most of the coal powder in the collection cavity 5011 to be intercepted by the filter plate 503 or filter screen and block the filter hole 5031, thereby enabling the photoelectric sensor 504 to quickly identify the change in the light transmittance of the filter hole 5031, thereby improving the response speed of the leakage monitoring device.

[0083] Based on the same inventive concept, this invention also discloses a leakage monitoring system for a pulverized coal conveying pipeline 1, such as... Figure 8 As shown, the leakage monitoring system includes a data acquisition processor 11, a monitoring host 12, and a leakage monitoring device for the pulverized coal conveying pipeline 1 as described in any of the above embodiments.

[0084] The data acquisition processor 11 is electrically connected to the flow identification component 5 of the leakage monitoring device of the pulverized coal conveying pipeline 1 to receive the monitoring signal of the flow identification component 5 and convert the monitoring signal into a digital signal.

[0085] The monitoring host 12 is connected to the data acquisition processor 11 to receive digital signals from the data acquisition processor 11 and make corresponding feedback based on the digital signals.

[0086] For example, the data acquisition processor 11 acquires the photoelectric sensor 504 signal of each flow guide identification device and converts it into a digital signal. It can be set to convert the digital signal to 1 when light is reflected back to the photoelectric sensor 504 and to convert the digital signal to 0 when no light is reflected back to the photoelectric sensor 504. The digital signal is uploaded to the monitoring host 12 via a communication line or wireless transmission. The monitoring host 12 determines whether coal powder leakage has occurred at all pipe flange 2 locations and provides corresponding feedback.

[0087] In one embodiment of the present invention, when a coal powder leak occurs in the conveying pipeline 1, the corresponding feedback includes at least an indication of the location of the coal powder leak and the issuance of an alarm signal.

[0088] This leak detection system uses a covering component 3, a first sealing ring 4, and a flow guiding and identification component 5 installed at the connection of the pipe flange 2 of adjacent conveying pipes 1. The flow guiding and identification component 5 is connected to an annular cavity 6 formed by the first sealing ring 4, the two adjacent pipe flanges 2, and the covering component 3. This allows coal dust in the conveying pipe 1 to enter the monitoring cavity of the flow guiding and identification component 5, and enables the identification and monitoring of trace amounts of coal dust entering the monitoring cavity. Because the flow guiding and identification component 5 provides low flow resistance to coal dust, the coal dust can easily enter the monitoring cavity with the airflow and be immediately identified. Therefore, the leak detection system has a fast monitoring response speed, with a typical monitoring time of less than 1 second. This allows for early detection of leaks in the conveying pipe 1, enabling effective protective measures to be taken to avoid safety accidents.

[0089] The foregoing has described in detail several embodiments of the present invention, but the present invention is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of the present invention, and all such variations and modifications should fall within the scope of protection claimed by the present invention.

Claims

1. A leakage monitoring device for a pulverized coal conveying pipeline, wherein two adjacent conveying pipelines are connected by two pipeline flanges; characterized in that, The leakage monitoring device includes: A covering assembly that tightly covers the outside of two adjacent pipe flanges; The first sealing ring is disposed between two adjacent pipe flanges, and The first sealing ring, together with the two adjacent pipe flanges and the covering assembly, forms an annular cavity; A flow guiding and identification component has a monitoring cavity that is connected to an annular cavity body, and the flow guiding and identification component has a photosensitive identification element that identifies coal dust in the monitoring cavity; The diversion identification component includes: A collecting pipe, which is a straight pipe, has a collecting cavity for collecting pulverized coal, a first port communicating with the collecting cavity is provided on the side wall of the collecting pipe, a second port communicating with the collecting cavity is provided at one end of the collecting pipe, and a third port communicating with the collecting cavity is provided at the other end of the collecting pipe. A guide pipe having a guide cavity open at both ends, one end of the guide pipe communicating with the annular cavity and the other end connected to the first pipe opening, so as to guide the coal powder leaking from the conveying pipe into the annular cavity into the collection cavity; A filter plate that is sealed at the second pipe opening, the filter plate having filter holes; A photoelectric sensor is detachably and sealed at the third pipe opening, with one photosensitive end of the photoelectric sensor located inside the collecting cavity. When black coal dust blocks the filter hole, preventing light from the external environment from entering the collecting cavity through the filter hole, the light emitted by the photoelectric sensor will be absorbed by the coal dust, and no light will return to the photoelectric sensor. If there is no coal dust leakage and the filter plate is not covered with coal dust, the light emitted by the photoelectric sensor will be reflected back to the photoelectric sensor by the filter plate.

2. The leakage monitoring device for pulverized coal conveying pipelines according to claim 1, characterized in that, The covering assembly includes a second sealing ring and a covering shell; The inner circumferential surface of the second sealing ring is sealed and attached to the outer circumferential surface of the two adjacent pipe flanges; The outer casing covers the outer circumferential surface of the second sealing ring, and is used to tighten the second sealing ring to the outer circumferential surface of the pipe flange.

3. The leakage monitoring device for pulverized coal conveying pipelines according to claim 2, characterized in that, The outer casing includes a first outer casing and a second outer casing; The inner shell surfaces of the first and second outer shells are respectively attached to the outer circumferential surface of the second sealing ring, and the first and second outer shells are detachably fixed.

4. The leakage monitoring device for pulverized coal conveying pipelines according to claim 2, characterized in that, The second sealing ring is provided with a first through hole that extends radially through the second sealing ring; The outer casing is provided with a second through hole arranged coaxially with the first through hole; One end of the guide pipe is sealed at the second through hole, so that the coal powder in the annular cavity can enter the guide cavity in sequence through the first through hole and the second through hole.

5. The leakage monitoring device for pulverized coal conveying pipelines according to claim 2, characterized in that, The guide tube is integrated with the outer shell.

6. The leakage monitoring device for pulverized coal conveying pipelines according to claim 1, characterized in that, The pipe flange is cylindrical, and two adjacent pipe flanges are respectively provided with annular bosses at their opposite ends. The two ends of the first sealing ring are respectively tightly abutted against the opposite surfaces of the two bosses; the outer peripheral surfaces of the bosses form part of the cavity wall of the annular cavity.

7. The leakage monitoring device for pulverized coal conveying pipelines according to claim 1, characterized in that, The mesh size of the filter is between 80 and 200 mesh.

8. A leakage monitoring system for a pulverized coal conveying pipeline, characterized in that, It includes a data acquisition processor, a monitoring host, and a leakage monitoring device for the pulverized coal conveying pipeline as described in any one of claims 1 to 7; The data acquisition processor is electrically connected to the flow identification component of the leakage monitoring device of the pulverized coal conveying pipeline to receive the monitoring signal of the flow identification component and convert the monitoring signal into a digital signal; The monitoring host is connected to the data acquisition processor to receive the digital signals from the data acquisition processor and make corresponding feedback based on the digital signals.

9. The leakage monitoring system for pulverized coal conveying pipelines according to claim 8, characterized in that, When a coal dust leak occurs in the conveying pipeline, the corresponding feedback includes at least indicating the location of the coal dust leak and issuing an alarm signal.

Images