System for preventing excessive abrasion of ventilation and dust removal pipeline elbow

Abstract

The utility model relates to a system for preventing an elbow of a ventilation and dust removal pipeline from being excessively abraded. The system comprises an electric valve, a flow velocity sensor, an outer protection plate and a control system, the ventilation dust removal pipeline comprises a vertical pipe section, an elbow and a horizontal pipe section which are connected in sequence, the lower end of the vertical pipe section is connected with a dust hood, and an electric valve is arranged at an air inlet of the vertical pipe section; a flexible flow velocity sensor is arranged on the outer side of a large-diameter corner of the elbow and tightly attached to the outer wall of the elbow body, and an outer protection plate is arranged on the outer side of the flow velocity sensor. The signal output end of the flow velocity sensor and the control end of the electric valve are connected with the control system. The system provided by the utility model can timely and accurately find the excessive wear condition of the elbow of the ventilation and dust removal pipeline, carries out early warning in advance, and simultaneously controls the electric valve at the dust hood to be closed in an interlocking manner, so that the elbow is convenient to maintain and replace; the structure is simple and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal and ventilation, in particular to a system for preventing excessive wear of elbows in ventilation and dust removal pipelines. Background Art

[0002] Dust is often generated during production processes in fields such as metallurgy, chemicals, food, steel, thermal power, and concrete. To meet environmental protection requirements, dust or dust-laden flue gas must be collected and purified. The most common method is to install a dust hood at the dust-generating point to collect the dust-laden air or flue gas, which is then piped to a dust removal device. The purified gas can then be discharged directly into the atmosphere, while the dust intercepted by the dust removal device is then concentrated for subsequent harmless treatment.

[0003] During daily use, dust removal system pipes carry dust at high speeds along with the airflow. Due to inertia, these particles can cause erosion and impact wear on the inner walls of the pipes. Severe wear can even cause damage and leakage. This not only affects the performance of the dust removal system and reduces dust removal efficiency, but can also cause secondary pollution. If combustible dust is being transported, its dispersion in the air can easily cause explosions and other safety hazards.

[0004] In order to increase the service life of the dust removal system pipeline, the most commonly used method at present is to add a wear-resistant lining to the inner wall of the pipeline. Common materials for the wear-resistant lining include wear-resistant ceramics, polyethylene (including ultra-high molecular weight polyethylene), polyurethane, etc., or spray a wear-resistant coating (such as polyurethane coating) on ​​the inner wall of the pipeline, which can effectively improve the wear resistance of the pipeline and extend the service life of the pipeline.

[0005] However, due to the different locations and operating conditions of pipelines, the degree of wear varies. Companies typically perform regular maintenance on pipelines, which can hinder the timely identification of excessively worn areas. Pipes connected to downdraft hoods are particularly prone to elbows, typically located above the hood to redirect the dust collection duct. Due to their proximity to the hood and their 90° bend, dust is particularly susceptible to erosion of the outer and inner walls of the elbow, causing the elbow in this area to wear far more than other parts of the pipeline. Promptly identifying excessive elbow wear is crucial for the effective operation of the entire dust collection system. Summary of the Invention

[0006] The utility model provides a system for preventing excessive wear of the elbows of the ventilation and dust removal ducts, which can timely and accurately detect excessive wear of the elbows of the ventilation and dust removal ducts, issue early warnings, and at the same time interlock and control the closure of the electric valve at the dust collection hood, making it convenient to repair and replace the elbows; the system has a simple structure and is easy to use.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A system for preventing excessive wear of elbows in ventilation and dust removal ducts, comprising an electric valve, a flow rate sensor, an external protective plate and a control system; the ventilation and dust removal duct comprises a vertical pipe section, an elbow and a horizontal pipe section connected in sequence, wherein the lower end of the vertical pipe section is connected to a dust hood, and an electric valve is provided at the air inlet of the vertical pipe section; a flexible flow rate sensor is provided on the outside of the large-diameter corner of the elbow, the flow rate sensor is tightly attached to the outer wall of the elbow body, and an external protective plate is provided on the outside of the flow rate sensor; the signal output end of the flow rate sensor and the control end of the electric valve are respectively connected to the control system.

[0009] The flow velocity sensor has a coverage angle of not less than 240° outside the large diameter corner of the elbow and is symmetrically arranged with the vertical center line of the elbow as the axis.

[0010] The area of ​​the outer protective plate is larger than that of the flow rate sensor. The edge of the outer protective plate is welded and fixed to the pipeline body. The flow rate sensor is arranged in the interlayer between the outer protective plate and the pipeline body. The outer protective plate has a hole for the signal cable of the flow rate sensor to pass through.

[0011] The elbow body is made of wear-resistant material.

[0012] The elbow body is provided with a wear-resistant layer on the inner side of the large-diameter corner, and the wear-resistant layer is a wear-resistant steel plate lining or a wear-resistant paint spray layer.

[0013] The outer protection plate is made of wear-resistant steel plate.

[0014] The control system is connected to a host computer in a central control room, and the host computer is further connected to an alarm device.

[0015] The elbow is a multi-section combined structure, and each section of the elbow is sealed and connected by a flange; a flow rate sensor and an outer protection plate are respectively provided on the outer side of the corner of each section of the elbow.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) A flexible flow sensor is installed at the part of the elbow that is most susceptible to wear (outside the elbow corner near the dust hood). When a part of the elbow body is worn, the flow sensor is directly exposed to the airflow in the pipe and sends a flow detection signal. When the control system receives the flow detection signal sent by the flow sensor, it means that the corresponding part of the elbow is excessively worn. At this time, the control system immediately interlocks and controls the electric valve at the air inlet of the ventilation and dust removal duct to close, and promptly repairs and replaces the elbow to ensure the effective operation of the dust removal system and avoid environmental and safety problems caused by dust diffusion.

[0018] 2) When the dust removal system is equipped with multiple dust collection points, a certain elbow can be replaced online by closing the corresponding electric valve without affecting the normal dust removal operation of other dust collection points;

[0019] 3) For large ventilation and dust removal ducts, the elbows are designed as a segmented combination structure, and a flow rate sensor is installed on each elbow. When a certain section of the elbow is worn, only the elbow of the corresponding section needs to be replaced, which greatly improves the maintenance efficiency and reduces the equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a system for preventing excessive wear of elbows in ventilation and dust removal ducts described in the present invention.

[0021] Figure 2 yes Figure 1 A-axis view in (rotated 90° counterclockwise).

[0022] Figure 3 It is a partial cross-sectional view of the elbow of the utility model.

[0023] Figure: 1. Dust hood 21. Vertical pipe section 22. Elbow 23. Horizontal pipe section 24. Wear-resistant lining 3. Flow rate sensor 4. External protection plate 5. Electric valve 6. Control system 7. Host computer DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0025] like Figure 1-Figure 3 As shown, the utility model describes a system for preventing excessive wear of elbows in ventilation and dust removal ducts, comprising an electric valve 5, a flow rate sensor 3, an outer protective plate 4 and a control system 6; the ventilation and dust removal duct comprises a vertical pipe section 21, an elbow 22 and a horizontal pipe section 23 connected in sequence, wherein the lower end of the vertical pipe section 21 is connected to the dust hood 1, and an electric valve 5 is provided at the air inlet of the vertical pipe section 21; a flexible flow rate sensor 3 is provided on the outside of the large-diameter corner of the elbow 22, the flow rate sensor 3 is tightly attached to the outer wall of the elbow body, and an outer protective plate 4 is provided on the outside of the flow rate sensor 3; the signal output end of the flow rate sensor 3 and the control end of the electric valve 5 are respectively connected to the control system 6.

[0026] The flow velocity sensor 3 covers an angle of not less than 240° outside the large diameter corner of the elbow 22 and is symmetrically arranged with the vertical center line of the elbow 22 as the axis.

[0027] The area of ​​the outer protective plate 4 is larger than that of the flow rate sensor 3. The edge of the outer protective plate 4 is welded and fixed to the pipeline body. The flow rate sensor 3 is arranged in the interlayer between the outer protective plate 4 and the pipeline body. The outer protective plate 4 has a hole for the signal cable of the flow rate sensor 3 to pass through.

[0028] The elbow body is made of wear-resistant material.

[0029] The elbow body is provided with a wear-resistant layer on the inner side of the large-diameter corner, and the wear-resistant layer is a wear-resistant steel plate lining or a wear-resistant paint spray layer.

[0030] The outer protection plate 4 is made of wear-resistant steel plate.

[0031] The control system 6 is connected to a host computer 7 in a central control room, and the host computer 7 is further connected to an alarm device.

[0032] The elbow 22 is a multi-section structure, and each section of the elbow is sealed and connected by a flange; a flow rate sensor 3 and an outer protection plate 4 are respectively provided on the outer side of the corner of each section of the elbow.

[0033] The present invention is a system for preventing excessive wear of elbows in ventilation and dust removal ducts. The elbow 22 is the portion connecting the vertical pipe section 21 and the horizontal pipe section 22. Viewed from its vertical center cross-section, it has a large-diameter corner on one side and a small-diameter corner on the other. The dust-laden airflow drawn in by the dust hood 1 directly impacts the inner wall of the large-diameter corner of the elbow 22. Therefore, the large-diameter corner of the elbow 22 is often the most susceptible to wear and damage. The present invention provides an early warning of excessive wear of the elbow 22 by disposing a flow rate sensor 3 outside the large-diameter corner of the elbow 22, which is most susceptible to wear.

[0034] In order to better fit with the elbow 22, the present invention selects a flexible flow rate sensor 3, such as a flow rate sensor disclosed in the Chinese invention patent with authorization announcement number CN 108918906 B, which includes a double-layer polyimide film substrate, a graphene / polyimide piezoresistive unit and a signal lead; by arranging a bionic ciliary structure and a graphene / polyimide piezoresistive unit on the surface of the double-layer polyimide film substrate, the stress change of the piezoresistive unit caused by the bending of the bionic ciliary structure under the action of the external fluid can be measured, thereby measuring the flow rate. Since polyimide film is used as a flexible substrate, it is convenient to arrange it on an arc-shaped wing surface or other possible curved surface. However, the flexible flow rate sensor described in the present invention is not limited to the above-mentioned flow rate sensor, and any flow rate sensor that can fit on the outer surface of the elbow corner can be used.

[0035] After the flow rate sensor 3 promptly detects the excessive wear problem at the elbow 22, the control system 6 immediately interlocks and closes the electric valve 5 installed at the air inlet of the ventilation and dust removal duct (an electric valve can also be installed downstream of the elbow 22 and the two electric valves can be closed at the same time), thereby realizing online maintenance and replacement of the elbow 22.

[0036] When the ventilation and dust removal system is working normally, the electric valve 5 is in a normally open state. Under the action of the dust removal fan, dust is sucked through the dust removal hood 1 arranged at the dust removal point; the dust particles in the inhaled air flow always have a scouring effect on the inner wall of the elbow 22, especially the inner wall at the large-diameter corner. In the initial stage of the elbow 22 being put into operation, the elbow body or the wear-resistant layer (wear-resistant lining or wear-resistant spray coating) arranged in the elbow body is only slightly worn. At this time, the flow rate sensor 3 is not exposed to the airflow, so it will not send a flow rate detection signal to the control system 6.

[0037] After long-term operation, the elbow 22 may experience severe wear on the elbow body, or both the wear-resistant layer and the elbow body. The flow velocity sensor 3 at the worn location is directly exposed to the airflow in the ventilation and dust removal duct. The flow velocity sensor 3 immediately sends a flow velocity detection signal to the control system 6. Upon receiving the flow velocity detection signal, the control system 6 immediately sends a control signal to the electric valve 5, automatically closing the electric valve 5. Simultaneously, the control system 6 sends an early warning signal to the host computer 7 in the central control room, which then sounds an alarm through the alarm device, reminding the operator to promptly repair or replace the excessively worn elbow 22.

[0038] For large ventilation and dust removal ducts, the elbow 22 can be designed as a multi-section structure, with each section sealed by a flange (equipped with a sealing structure such as a sealing rubber ring). A flow rate sensor 3 and an outer protective plate 4 are installed on the outside of the large-diameter corner of each elbow. This allows for targeted inspection and replacement of a particular elbow section if it exhibits excessive wear.

[0039] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for preventing excessive wear of ventilation and dust removal duct elbows, characterized in that: It includes an electric valve, a flow rate sensor, an external protective plate and a control system; the ventilation and dust removal duct includes a vertical pipe section, an elbow and a horizontal pipe section connected in sequence, wherein the lower end of the vertical pipe section is connected to the dust hood, and an electric valve is provided at the air inlet of the vertical pipe section; a flexible flow rate sensor is provided on the outside of the large-diameter corner of the elbow, the flow rate sensor is tightly attached to the outer wall of the elbow body, and an external protective plate is provided on the outside of the flow rate sensor; the signal output end of the flow rate sensor and the control end of the electric valve are respectively connected to the control system.

2. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The flow velocity sensor has a coverage angle of not less than 240° outside the large diameter corner of the elbow and is symmetrically arranged with the vertical center line of the elbow as the axis.

3. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The area of ​​the outer protective plate is larger than that of the flow rate sensor. The edge of the outer protective plate is welded and fixed to the pipeline body. The flow rate sensor is arranged in the interlayer between the outer protective plate and the pipeline body. The outer protective plate has a hole for the signal cable of the flow rate sensor to pass through.

4. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The elbow body is made of wear-resistant material.

5. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The elbow body is provided with a wear-resistant layer on the inner side of the large-diameter corner, and the wear-resistant layer is a wear-resistant steel plate lining or a wear-resistant paint spray layer.

6. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The outer protection plate is made of wear-resistant steel plate.

7. A system for preventing excessive wear of ventilation and dust removal duct elbows according to claim 1, characterized in that: The control system is connected to a host computer in a central control room, and the host computer is further connected to an alarm device.

8. The system for preventing excessive wear of elbows in ventilation and dust removal ducts according to claim 1, characterized in that: The elbow is a multi-section combined structure, and each section of the elbow is sealed and connected by a flange; a flow rate sensor and an outer protection plate are respectively provided on the outer side of the corner of each section of the elbow.

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