Pneumatic conveying pipeline switching device

Abstract

The pneumatic conveying pipeline switching device comprises two pneumatic conveying pipelines and a conveying direction switching mechanism, wherein the two pneumatic conveying pipelines are arranged in parallel in a spaced mode, and the conveying direction switching mechanism is connected between the two pneumatic conveying pipelines. The conveying direction switching mechanism comprises a converging pipeline, a cut-off valve and a plurality of connecting bent pipes; the upstream end and the downstream end of each pneumatic conveying pipeline in the conveying direction are connected to the converging pipeline through the corresponding connecting bent pipe. The cut-off valve is installed on the convergence pipeline and used for controlling connection and disconnection of the convergence pipeline. According to the pneumatic ash conveying device, ash conveying path switching between the two pneumatic conveying pipelines with the same conveying medium and the same pressure grade in the parallel pipelines can be achieved, pneumatic ash conveying work is more flexible and controllable, and when upstream and downstream equipment of the pneumatic conveying pipelines is overhauled, other parts can still work normally; and the overall operation rate of the pneumatic ash conveying system is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic pipeline transportation, in particular to a pneumatic transportation pipeline switching device. Background Art

[0002] In the production process of iron and steel metallurgical enterprises, some solid powdered materials are transported by pneumatic conveying. Process conveying tanks for processes such as blast furnace coal injection are connected in series, fed through a single pipeline to the blast furnace tuyere injection device. Some metallurgical process conveying pipelines are connected in parallel, using multiple pipelines arranged side by side to complete the conveying operation. For example, in the blast furnace coking dust recycling process, the dust from the blast furnace coking environment is transported to the grinding mill through different conveying tanks. Each conveying pipeline corresponds to a specific conveying tank, which is a parallel pipeline.

[0003] When the upstream valves and equipment of a single conveying pipeline in a parallel pipeline are under maintenance, the conveying operation needs to be terminated, and at this time, there is no material input to the corresponding downstream equipment; when the downstream valves and equipment of a single conveying pipeline equipment in a parallel pipeline are under maintenance, the conveying operation also needs to be terminated, and at this time, the upstream equipment materials cannot be output to the downstream, and the materials can only be piled up waiting for the maintenance to be completed or the upstream operation to be suspended. Either of these two situations will cause the upstream equipment or downstream equipment corresponding to the conveying pipeline to stop production and reduce the operating rate of the equipment. Therefore, the present application provides a pneumatic conveying pipeline switching device that can flexibly switch the conveying direction of two pneumatic conveying pipelines. When the upstream or downstream of one of the pneumatic conveying pipelines is under maintenance, it will not affect the operation of the downstream or upstream equipment corresponding to the pneumatic conveying pipeline. Utility Model Content

[0004] The utility model provides a pneumatic conveying pipeline switching device, which can realize the ash conveying path switching between two pneumatic conveying pipelines with the same conveying medium and the same pressure level in parallel pipelines, making the pneumatic ash conveying operation more flexible and controllable. When the upstream and downstream equipment of the pneumatic conveying pipeline is under maintenance, the remaining parts can still work normally, thereby increasing the overall operation rate of the pneumatic ash conveying system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A pneumatic conveying pipeline switching device includes two pneumatic conveying pipelines arranged in parallel and spaced apart, and a conveying direction switching mechanism connected between the two pneumatic conveying pipelines; the conveying direction switching mechanism includes a merging pipeline, a shut-off valve and a plurality of connecting elbows; the upstream end and the downstream end of the conveying direction of each pneumatic conveying pipeline are connected to the merging pipeline through a connecting elbow; the shut-off valve is installed on the merging pipeline and is used to control the on and off of the merging pipeline.

[0007] Furthermore, a stop valve is provided at the downstream end of the two pneumatic conveying pipelines in the conveying direction.

[0008] Furthermore, the connecting bend is configured as a right-angle bend, and the turning radius of the connecting bend is greater than or equal to 10 times the diameter of the pneumatic conveying pipeline.

[0009] Furthermore, both ends of the merging pipe are connected to one end of the two connecting elbows respectively through a Y-shaped tee; the other end of each connecting elbow is connected to a corresponding pneumatic conveying pipe through a Y-shaped tee;

[0010] Furthermore, the interior of each connecting elbow and each Y-shaped tee is treated with tungsten carbide or provided with a wear-resistant spray lining.

[0011] Furthermore, the wear-resistant spray lining is made of aluminum-based ceramics or composite corundum.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model can realize the switching of ash conveying paths between two pneumatic conveying pipelines with the same conveying medium and the same pressure level in parallel pipelines, making the pneumatic ash conveying operation more flexible and controllable. When the upstream and downstream equipment of the pneumatic conveying pipeline is under maintenance, the other parts can still work normally, thereby increasing the overall operation rate of the pneumatic ash conveying system.

[0014] 2. The turning radius of the connecting elbow is greater than or equal to 10 times the diameter of the pneumatic conveying pipeline, which can effectively avoid blockage during the pneumatic ash conveying process.

[0015] 3. The interior of each connecting elbow and each Y-type tee is treated with tungsten carbide process or equipped with wear-resistant spray lining to improve the wear resistance of the pipe wall, reduce wear and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a further detailed description of the specific embodiments of the present invention with reference to the accompanying drawings, wherein:

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure ID:

[0019] 1-conveying direction switching mechanism, 11-merging pipe, 12-cut-off valve, 13-connecting elbow, 21-first pneumatic conveying pipe, 22-second pneumatic conveying pipe, 3-first stop valve, 4-second stop valve, 5-first Y-type tee, 6-second Y-type tee, 7-third Y-type tee, 8-fourth Y-type tee, 9-fifth Y-type tee, 10-sixth Y-type tee. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. When a component is referred to as being "set in the middle", it does not only mean being set in the exact middle position, but also means being within the range defined by the middle as long as both ends are not set. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Reference Figure 1 As shown, a pneumatic conveying pipeline switching device includes two pneumatic conveying pipelines arranged in parallel and spaced apart, and a conveying direction switching mechanism 1 connected between the two pneumatic conveying pipelines; the conveying direction switching mechanism 1 includes a merging pipeline 11, a shut-off valve 12, and a plurality of connecting elbows 13; the upstream end and the downstream end of the conveying direction of each pneumatic conveying pipeline are connected to the merging pipeline 11 through a connecting elbow 23; the shut-off valve 12 is installed on the merging pipeline 11, and is used to control the on and off of the merging pipeline 11. The utility model can realize the switching of the ash conveying path between two pneumatic conveying pipelines with the same conveying medium and the same pressure level in parallel pipelines, making the pneumatic ash conveying operation more flexible and controllable. When the upstream and downstream equipment of the pneumatic conveying pipeline are under maintenance, the remaining parts can still work normally, thereby increasing the overall operation rate of the pneumatic ash conveying system.

[0024] In this embodiment, both pneumatic conveying pipes are equipped with stop valves at their downstream ends in the conveying direction. The connecting elbow 13 is configured as a right-angle elbow. Since the conveyed material is pneumatically conveyed, the medium in the pipe is a mixture of gas and solids. Therefore, to avoid pipe clogging, the turning radius R of the right-angle elbow needs to be increased. Preferably, the turning radius R of the connecting elbow is greater than or equal to 10 times the diameter of the pneumatic conveying pipe. For example, when using a DN50 pneumatic conveying pipe, the turning radius of the right-angle elbow should be greater than or equal to 500 mm.

[0025] The specific connection and installation method is as follows: the two pneumatic conveying pipes are arranged in parallel and spaced apart, the merging pipe 11 is located between the two pneumatic conveying pipes, and both ends of the merging pipe 11 are connected to one end of the two connecting elbows 13 through a Y-shaped tee; the other end of each connecting elbow 13 is connected to the corresponding pneumatic conveying pipe through a Y-shaped tee.

[0026] Because the conveying medium is a mixture of gas and solids, the walls of the Y-shaped tee and the connecting elbow are easily struck by fly ash under the influence of wind and easily worn through. Therefore, the interior of each connecting elbow 13 and each Y-shaped tee is treated with tungsten carbide or provided with a wear-resistant spray lining to improve the wear resistance of the pipe walls. Preferably, the wear-resistant spray lining is made of aluminum-based ceramic or composite corundum.

[0027] For the convenience of distinction, the two pneumatic conveying pipelines are respectively referred to as the first pneumatic conveying pipeline 21 and the second pneumatic conveying pipeline 22. Correspondingly, the stop valve at the downstream end B of the first pneumatic conveying pipeline 21 is called the first stop valve 3, and the stop valve at the downstream end D of the second pneumatic conveying pipeline 3 is called the second stop valve 4; the Y-type tee at the upstream end A of the first pneumatic conveying pipeline 1 is called the first Y-type tee 5, and the Y-type tee at the downstream end B of the first pneumatic conveying pipeline 21 is called the second Y-type tee 6; the Y-type tee at the upstream end C of the second pneumatic conveying pipeline 22 is called the third Y-type tee 7, and the Y-type tee at the downstream end D of the second pneumatic conveying pipeline 22 is called the fourth Y-type tee 8; the Y-type tee on the side of the converging pipeline 11 close to the first pneumatic conveying pipeline 21 is called the fifth Y-type tee 9, and the Y-type tee on the side of the second pneumatic conveying pipeline 22 is called the sixth Y-type tee 10; the shut-off valve 12 is located at point E of the converging pipeline. In this embodiment, it is assumed that both the upstream end A of the first pneumatic conveying pipeline 21 and the upstream end C of the second pneumatic conveying pipeline are provided with stop valves.

[0028] The specific pneumatic conveying lines during operation are as follows:

[0029] 1. When the pneumatic ash conveying system operates normally, the shut-off valve 12 is closed, the first shut-off valve 3 and the second shut-off valve 4 are opened, and the pneumatic ash conveying medium and materials are transported to the downstream through the first pneumatic conveying pipeline 21 and the second pneumatic conveying pipeline 22 respectively. The specific routes are AB and CD;

[0030] 2. When the equipment at the upstream end A of the first pneumatic conveying pipeline 21 is under maintenance, the upstream end A of the first pneumatic conveying pipeline 21 is no longer conveying materials to the downstream end B. The shut-off valve 12 is opened, and the first stop valve 3 and the second stop valve 4 are opened. The routes of the pneumatic ash conveying medium and the material are CEB and CD respectively.

[0031] 3. When the equipment at the upstream end C of the second pneumatic conveying pipeline 21 is under maintenance, the upstream end C of the second pneumatic conveying pipeline 22 is no longer conveying materials to the downstream end D. The shut-off valve 12 is opened, and the first stop valve 3 and the second stop valve 4 are opened. The routes of the pneumatic ash conveying medium and the material are AB and AED respectively.

[0032] 4. When the equipment at the downstream end B of the first pneumatic conveying pipeline 21 is under maintenance, the downstream end B of the first pneumatic conveying pipeline 21 no longer receives materials, the shut-off valve 12 is opened, the first stop valve 3 is closed, and the second stop valve 4 is opened. The routes of the pneumatic ash conveying medium and the material are AED and CD respectively;

[0033] 5. When the equipment at the downstream end D of the second pneumatic conveying pipeline 21 is under maintenance, the downstream end D of the second pneumatic conveying pipeline 22 no longer receives materials, the shut-off valve 12 is opened, the first stop valve 3 is opened, and the second stop valve 4 is closed. The routes of the pneumatic ash conveying medium and the material are AB and CEB respectively.

[0034] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A pneumatic conveying pipeline switching device, characterized in that: It comprises two pneumatic conveying pipes arranged in parallel and spaced apart, and a conveying direction switching mechanism connected between the two pneumatic conveying pipes; the conveying direction switching mechanism comprises a merging pipe, a shut-off valve and a plurality of connecting elbows; the upstream end and the downstream end of the conveying direction of each pneumatic conveying pipe are connected to the merging pipe through a connecting elbow; the shut-off valve is installed on the merging pipe to control the on and off of the merging pipe.

2. A pneumatic conveying pipeline switching device according to claim 1, characterized in that: The downstream ends of the two pneumatic conveying pipelines in the conveying direction are both provided with stop valves.

3. A pneumatic conveying pipeline switching device according to claim 1, characterized in that: The connecting elbow is configured as a right-angle elbow, and the turning radius of the connecting elbow is greater than or equal to 10 times the diameter of the pneumatic conveying pipeline.

4. A pneumatic conveying pipeline switching device according to claim 3, characterized in that: Both ends of the merging pipe are connected to one end of the two connecting elbows through a Y-shaped tee respectively; the other end of each connecting elbow is connected to a corresponding pneumatic conveying pipe through a Y-shaped tee.

5. The pneumatic conveying pipeline switching device according to claim 3, characterized in that: The interior of each connecting elbow and each Y-shaped tee is subjected to tungsten carbide process treatment or provided with a wear-resistant spray lining.

6. A pneumatic conveying pipeline switching device according to claim 5, characterized in that: The wear-resistant spray lining is made of aluminum-based ceramics or composite corundum.

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