A split-type adjustable anti-blocking pulverized coal pipeline throttling device

Abstract

The present invention discloses a split adjustable anti-blocking type pulverized coal pipeline throttling device, which includes a support frame, wear-resistant stop rods, a limit sleeve body, an adjusting screw rod, an adjusting screw rod gear and an adjusting gear; the support frame is an integral structure with the pulverized coal pipe, and several wear-resistant stop rods are inserted from the side wall of the pulverized coal pipe. One end of the wear-resistant stop rod is arc-shaped and matches the inner wall of the pulverized coal pipe, and the other end is connected to the adjusting screw rod. The limit sleeve body is sleeved on the wear-resistant stop rod, and one end of the limit sleeve body is fixedly connected to the support frame; the adjusting gear and the adjusting screw rod gear are fixed on the support frame, the adjusting gear meshes with the adjusting screw rod gear, and the adjusting screw rod gear is sleeved on the adjusting screw rod and fixed on the support frame. By using multiple wear-resistant stop rods to replace the traditional split throttle baffle, air-powder throttling is realized, the pressure in the pulverized coal pipeline is balanced, and problems such as easy jamming, difficult adjustment, and extremely easy powder accumulation and explosion of the traditional throttle orifice can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler pulverized coal pipeline throttling adjustment, and relates to a split-type adjustable anti-blocking pulverized coal pipeline throttling device. Background Art

[0002] In order to balance the pulverized coal pressure in the coal-feeding pipeline of a coal-fired boiler and ensure uniform distribution of air volume and powder volume among different pulverized coal pipelines, throttling orifices are generally equipped on the pulverized coal pipelines of coal-fired boilers. Currently, the most widely used is the split-type double-core throttling orifice. The double-core plate reciprocates from the center of the pipeline to adjust the opening area. The pulverized coal in the pipeline always flows in the center of the pipeline, reducing flow loss and avoiding excessive wear. This throttling orifice is convenient to adjust, intuitive, and has a long service life. However, it is found during use that the biggest problem with this throttling orifice is that after a long time without adjustment, pulverized coal is prone to deposit and block in the cavity of the throttling orifice, which not only causes the throttling orifice to be unable to be adjusted, but also easily leads to powder pipe deflagration, seriously affecting the safe operation of the coal pulverizing system. In order to prevent powder pipe deflagration, many power plants are forced to seal the throttling orifice with castable, but this results in the throttling orifice being unable to be adjusted. Summary of the Invention

[0003] The purpose of the invention is to solve the problem in the prior art that pulverized coal in the boiler coal-feeding pipeline is prone to deposit and block in the cavity of the throttling orifice, resulting in the inability to adjust the throttling orifice and easily causing powder pipe deflagration, and to provide a split-type adjustable anti-blocking pulverized coal pipeline throttling device.

[0004] To achieve the above purpose, the invention adopts the following technical solutions:

[0005] A split-type adjustable anti-blocking pulverized coal pipeline throttling device, comprising a support frame, wear-resistant stop bars, a limit sleeve body, an adjusting screw, an adjusting screw gear, and an adjusting gear;

[0006] The support frame is an integral structure with the pulverized coal pipe. A number of wear-resistant stop bars are inserted from the side wall of the pulverized coal pipe. One end of the wear-resistant stop bar is arc-shaped and is matched with the inner wall of the pulverized coal pipe, and the other end is connected to the adjusting screw. The limit sleeve body is sleeved on the wear-resistant stop bar, and one end of the limit sleeve body is fixedly connected to the support frame; the adjusting gear and the adjusting screw gear are fixed on the support frame, the adjusting gear is meshed with the adjusting screw gear, and the adjusting screw gear is sleeved on the adjusting screw and fixed on the support frame.

[0007] A further improvement of the invention lies in:

[0008] A sealing ring is arranged at the connection between the wear-resistant stop bar and the pulverized coal pipe, and the sealing ring is made of silica gel soft material.

[0009] A scale pointer slot and scale lines are arranged on the limit sleeve body, and the end is the maximum stroke limit.

[0010] One end of the wear-resistant shift lever connected to the adjusting screw is provided with a scale pointer, which is located in the scale pointer slot and is used to indicate the opening degree adjusted by the wear-resistant shift lever.

[0011] The adjusting gear is an adjusting driving gear, which is fixed on the support frame and is coaxially provided with an adjusting transmission shaft.

[0012] An adjusting handle is installed at the end of the adjusting transmission shaft, and the end of the adjusting handle is a concave four-corner square, which is in fit connection with the convex four-corner square at the end of the adjusting transmission shaft.

[0013] Anti-rotation limit grooves are formed on the adjusting screw, and anti-rotation limit blocks are arranged on the support frame at corresponding positions, and the anti-rotation limit blocks are matched with the anti-rotation limit grooves.

[0014] The wear-resistant shift lever is composed of an inner and an outer layer structure. The inner layer is made of Q345 steel material, and the outer layer is made of ceramic wear-resistant material.

[0015] The adjusting screw is made of nitriding steel material.

[0016] The support frame is made of Q345 steel material.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a split-adjustable anti-blocking pulverized coal pipeline throttling device, which uses a plurality of wear-resistant shift levers to replace the traditional split throttle baffle to realize air-powder throttling and balance the pressure in the pulverized coal pipeline. Each wear-resistant shift lever can be adjusted separately, reducing the adjustment pressure. At the same time, the screw-gear structure is used for easy adjustment. Secondly, the circular anti-wear air-powder shift lever also greatly reduces the wear of the throttling device; and there is no redundant cavity in the device, so there is no problem of pulverized coal deposition and blockage affecting the adjustment, and the situation of pulverized coal pipe explosion due to long-term pulverized coal deposition is also avoided. It can effectively solve the problems such as easy jamming, difficult adjustment, and extremely easy powder accumulation and explosion of traditional throttle orifices.

[0019] Furthermore, by arranging a sealing ring at the connection between the wear-resistant shift lever and the pulverized coal pipe, coal powder leakage can be effectively prevented.

[0020] Furthermore, the outer layer of the inner layer material of the wear-resistant shift lever is wrapped with ceramic wear-resistant material, which can relieve the contact friction generated between the long-term and high-speed flowing pulverized coal, and reduce the friction loss. Brief Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on these drawings.

[0022] Figure 1 Perspective view of the split-adjustable anti-blocking pulverized coal pipeline throttling device of the present invention;

[0023] Figure 2 Schematic diagram of the split-adjustable anti-blocking pulverized coal pipeline throttling device of the present invention.

[0024] Wherein: 1 - support frame; 2 - wear-resistant stop bar; 3 - sealing ring; 4 - limiting sleeve body; 5 - scale pointer slot; 6 - scale line; 7 - maximum stroke limit; 8 - adjusting screw; 9 - adjusting screw gear; 10 - adjusting driving gear; 11 - anti-rotation limit block; 12 - anti-rotation limit groove; 13 - adjusting transmission shaft; 14 - adjusting handle; 15 - scale pointer; 16 - pulverized coal pipe. Specific embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0029] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0030] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] The present invention will be further described in detail below with reference to the drawings:

[0032] See Figure 1 - Figure 2, is a schematic diagram of the split-adjustable anti-blocking pulverized coal pipeline throttling device of the present invention. The device includes a support frame 1, wear-resistant retaining rods 2, sealing rings 3, a limit sleeve body 4, a scale pointer slot 5, scale lines 6, a maximum stroke limit 7, an adjusting screw 8, an adjusting screw gear 9, an adjusting driving gear 10, an anti-rotation limit block 11, an anti-rotation limit groove 12, an adjusting transmission shaft 13, an adjusting handle 14 and a scale pointer 15; the support frame 1 is an integral structure with the pulverized coal pipe, and several wear-resistant retaining rods 2 are inserted from the side wall of the pulverized coal pipe. A sealing ring 3 is arranged at the connection between the wear-resistant retaining rod 2 and the pulverized coal pipe. The sealing ring 3 is made of silicone soft material. One end of the wear-resistant retaining rod 2 is arc-shaped and matches the inner wall of the pulverized coal pipe, and the other end is connected to the adjusting screw 8. A scale pointer 15 is arranged at the end of the wear-resistant retaining rod 2 connected to the adjusting screw 8. The scale pointer 15 is located in the scale pointer slot 5 and is used to indicate the opening degree adjusted by the wear-resistant retaining rod 2; the limit sleeve body 4 is sleeved on the wear-resistant retaining rod 2. One end of the limit sleeve body 4 is fixedly connected to the support frame 1. The limit sleeve body 4 is provided with a scale pointer slot 5 and scale lines 6, and the end is the maximum stroke limit 7; the adjusting gear and the adjusting screw gear 9 are fixed on the support frame 1. The adjusting gear meshes with the adjusting screw gear 9. The adjusting screw gear 9 is sleeved on the adjusting screw 8 and fixed on the support frame 1. An anti-rotation limit groove 12 is opened on the adjusting screw 8, and an anti-rotation limit block 11 is arranged on the support frame 1 at the corresponding position. The anti-rotation limit block 11 cooperates with the anti-rotation limit groove 12.

[0033] Among them, the adjusting gear is the adjusting driving gear 10. The adjusting driving gear 10 is fixed on the support frame 1 and is coaxially provided with an adjusting transmission shaft 13; an adjusting handle 14 is installed at the end of the adjusting transmission shaft 13. The end of the adjusting handle 14 is a concave four-corner square and is connected to the convex four-corner square at the end of the adjusting transmission shaft 13 in a matching manner.

[0034] Among them, the support frame 1 is made of Q345 steel and is used to carry equipment components; the wear-resistant lever 2 consists of an inner and an outer layer. The inner layer is made of Q345 steel, and the outer layer is made of ceramic wear-resistant material. Multiple wear-resistant levers 2 are arranged in the pulverized coal pipe with a certain distance gap between them to ensure that the pulverized coal and air can pass through smoothly in the fully closed state. At the same time, due to long-term contact and friction with the high-speed flowing pulverized coal, a ceramic layer is coated on the outer layer of the head of the wear-resistant lever 2 to relieve friction loss; the sealing ring 3 is made of silicone soft material; the limiting sleeve body 4 is made of ordinary steel, and the length of the limiting sleeve body 4 is adapted to the length of the internal wear-resistant lever 2; the scale pointer slot 5 ensures the unobstructed movement of the scale pointer 15; the scale line 6 adjusts the proportional distance between the scale lines according to the length of the limiting sleeve body 4; the maximum stroke limit 7 prevents the wear-resistant lever 2 from being completely pulled out of the support frame 1, resulting in equipment failure; the adjusting screw 8 is made of nitrided steel. By rotating the adjusting screw gear 9, the adjusting screw 8 is driven to move back and forth, and then the wear-resistant lever 2 is driven to achieve the purpose of adjusting the opening; the adjusting screw gear 9 is made of forged steel, and threads are opened at the inner circular hole and meshed with the threads of the adjusting screw 8; the anti-rotation limit block 11 is made of Q345 steel and is an integral structure with the support frame 1; the adjusting transmission shaft 13 is made of forged steel, drives the gear to do work, and can meet the purpose of quick assembly and disassembly at the same time; the adjusting handle 14 is made of Q345 steel, and there is a rotatable handle at the tail to improve the hand feeling during rotation and transmit the force to the adjusting transmission shaft to do work.

[0035] The specific working process of the present invention is as follows:

[0036] Before adjustment, first insert the adjusting handle 14 into the four corners of the head of the adjusting transmission shaft 13 and then shake it to drive the rotation of the adjusting driving gear 10 of the concentric circle, and transmit the force to the adjusting screw gear 9. Since the diameter of the adjusting screw gear 9 is larger than that of the adjusting driving gear 10, a labor-saving effect is formed. The inner circle of the adjusting screw gear 9 has threads that are engaged with the threads of the adjusting screw 8. As the adjusting screw gear 9 rotates, the adjusting screw 8 drives the wear-resistant lever 2 to move back and forth. At the same time, the size of the flow cross-section of the pulverized coal pipeline is adjusted through the indication of the scale pointer slot 5, the scale line 6, and the scale pointer 15. Then adjust the next lever one by one. When adjusting, give priority to adjusting the lever in the middle position to ensure that the pulverized coal passes through the middle of the pipeline. There is a certain distance gap between the wear-resistant levers. Even if all the levers are closed to the bottom, the pulverized coal and air can pass through the gap between them.

[0037] The split adjustable anti-blocking pulverized coal pipeline throttling device in the present invention uses multiple wear-resistant rods to replace the traditional split throttle baffle, realizes air-powder throttling, balances the pressure in the pulverized coal pipeline, and each wear-resistant rod can be adjusted individually to reduce the adjustment pressure. At the same time, the screw gear structure is used for easy adjustment. Secondly, the circular anti-wear air-powder rod will also greatly reduce the wear of the throttling device; and there is no redundant cavity in the device, there is no problem of pulverized coal deposition blocking affecting the adjustment, nor the situation of pulverized coal pipe deflagration caused by long-term deposition of pulverized coal, which can effectively solve the problems of easy jamming, difficult adjustment, and extremely easy powder accumulation and deflagration of the traditional throttling orifice.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A split-type adjustable anti-blocking pulverized coal pipeline throttling device, characterized in that, it includes a support frame (1), wear-resistant stop bars (2), a limit sleeve body (4), an adjusting screw (8), an adjusting screw gear (9) and an adjusting gear; The support frame (1) is an integral structure with the pulverized coal pipe (16). A number of wear-resistant stop bars (2) are inserted from the side wall of the pulverized coal pipe. One end of the wear-resistant stop bar (2) is arc-shaped and matches the inner wall of the pulverized coal pipe, and the other end is connected to the adjusting screw (8). The limit sleeve body (4) is sleeved on the wear-resistant stop bar (2), and one end of the limit sleeve body (4) is fixedly connected to the support frame (1); The adjusting gear and the adjusting screw gear (9) are fixed on the support frame (1), the adjusting gear meshes with the adjusting screw gear (9), and the adjusting screw gear (9) is sleeved on the adjusting screw (8) and fixed on the support frame (1).

2. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, a sealing ring (3) is arranged at the connection between the wear-resistant stop bar (2) and the pulverized coal pipe, and the sealing ring (3) is made of silicone soft material.

3. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, a scale pointer slot (5) and a scale line (6) are arranged on the limit sleeve body (4), and the end is the maximum stroke limit (7).

4. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 3, characterized in that, a scale pointer (15) is arranged at one end of the wear-resistant stop bar (2) connected to the adjusting screw (8), and the scale pointer (15) is located in the scale pointer slot (5) for indicating the opening degree adjusted by the wear-resistant stop bar (2).

5. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, the adjusting gear is an adjusting driving gear (10), the adjusting driving gear (10) is fixed on the support frame (1), and an adjusting transmission shaft (13) is coaxially arranged.

6. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 5, characterized in that, an adjusting handle (14) is installed at the end of the adjusting transmission shaft (13), and the end of the adjusting handle (14) is concave four-cornered and is connected in a matching manner with the convex four-cornered shape at the end of the adjusting transmission shaft (13).

7. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, an anti-rotation limit groove (12) is opened on the adjusting screw (8), and an anti-rotation limit block (11) is arranged on the support frame (1) at the corresponding position, and the anti-rotation limit block (11) cooperates with the anti-rotation limit groove (12).

8. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, the wear-resistant stop bar (2) is composed of an inner and an outer layer structure. The inner layer is made of Q345 steel material, and the outer layer is made of ceramic wear-resistant material.

9. A split-type adjustable anti-blocking pulverized coal pipeline throttling device according to claim 1, characterized in that, the adjusting screw (8) is made of nitriding steel material.

10. A split adjustable anti-blocking pulverized coal pipeline throttling device as described in claim 1, characterized in that, the support frame (1) is made of Q345 steel material.

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