A drop tube for a boiler

Abstract

The utility model relates to a boiler equipment technical field especially relates to a kind of blanking tube of boiler, including coal bunker, the discharge end of coal bunker is provided with discharge pipe, discharge pipe is provided with anti-blocking device, the anti-blocking device includes the sleeve pipe of the inner wall of discharge pipe setting closely, the bottom of sleeve pipe is provided with connecting device, the connecting device is used to drive sleeve pipe to rotate inside discharge pipe, the connecting device includes the connecting pipe of the outside sleeve of discharge pipe, the bottom of connecting pipe is connected with the bottom of sleeve pipe by connecting plate, one end of connecting pipe is provided with driving device, can be flexibly adjusted according to different jamming condition clear jam mode, effectively solve the problem, such as the existing clear jam method operation is complicated, effect is not good etc., greatly improve the processing efficiency of coal bunker jam problem of thermal power plant.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to a boiler feed pipe. Background Technology

[0002] Power plant boilers, also known as "power plant boilers," are medium to large-sized boilers in power plants that supply a specified quantity and quality of steam to steam turbines. They are one of the main thermal equipment in thermal power plants. They are often paired with steam turbine generator sets of a certain capacity and are primarily used for power generation. However, during the operation of thermal power plants, issues such as the moisture content and particle size of the raw coal often lead to problems like material blockage and arching in the silos, which can cause malfunctions such as coal supply interruptions to the coal mills, affecting normal production and, in severe cases, causing the unit to trip.

[0003] Regarding the problem of coal bunker blockage in thermal power plants, many power plants have adopted various methods to clear the blockage, but the results have been unsatisfactory. The main reason is that the working conditions of pulverized coal in the coal bunker are dynamic, and the location and severity of the blockage vary. Therefore, it is necessary to use a combination of physical and even chemical methods to clear the blockage. Currently, conventional methods for clearing blockages include manual clearing or air cannons, each with its own advantages and disadvantages. Manual clearing involves puncturing coal through coal holes or striking the blocked area with a sledgehammer to break the blockage. Manual clearing can only be used as a temporary measure; while it can be effective, it causes serious damage to equipment and poses safety hazards. Air cannons utilize the instantaneous pulse effect of compressed air to directly impact the blocked area in the coal bunker, causing the pulverized coal to flow again under gravity. The drawback is that when the air cannon is positioned at the location of the blockage, it can cause the coal to become more compacted.

[0004] To address this issue, Chinese Patent Publication No. CN 211919671U discloses a coal hopper discharge pipe for power plant boilers. However, each time a blockage occurs, the sleeve needs to be removed from the discharge pipe, which is cumbersome and inconvenient for unblocking. Therefore, this technical solution is proposed for improvement. Utility Model Content

[0005] The purpose of this utility model is to overcome the inconvenience of unblocking the coal hopper of the boiler when the material is blocked in the existing technology, and to provide a material discharge pipe for the boiler.

[0006] This utility model is achieved through the following technical solution: a boiler feed pipe, including a coal bin, a feed pipe is provided at the discharge end of the coal bin, an anti-blocking device is provided on the feed pipe, and the anti-blocking device includes a sleeve that is closely attached to the inner wall of the feed pipe. The bottom of the sleeve is provided with a connecting device, which is used to drive the sleeve to rotate inside the discharge pipe; The connecting device includes a connecting pipe sleeved on the outside of the discharge pipe, the bottom of the connecting pipe being connected to the bottom of the sleeve via a connecting plate, and a driving device being provided at one end of the connecting pipe.

[0007] Furthermore, a retaining ring is provided inside the discharge pipe, and the top of the sleeve abuts against the lower part of the retaining ring.

[0008] Furthermore, the thickness of the retaining ring is equal to the thickness of the sleeve.

[0009] Furthermore, the driving device includes a plug hole provided on the outer wall of the connecting pipe for inserting a lever, and a bearing is sleeved on the outer wall of the discharge pipe, and the connecting pipe rotates coaxially with the discharge pipe through the bearing.

[0010] Furthermore, an opening groove is provided on the inner wall of the sleeve, the bottom of the opening groove is flush with the bottom of the sleeve, a movable plate is hinged inside the opening groove, a through hole is provided at the bottom of the opening groove, and an adjusting bolt is screwed to the lower part of the connecting pipe, one end of the adjusting bolt passes through the through hole and abuts against the lower part of the movable plate.

[0011] Furthermore, the vertical side of the opening groove is hinged to the side of the movable plate, the through hole is located on the side away from the hinge of the opening groove and the movable plate, and the thickness of the movable plate is less than or equal to the depth of the opening groove.

[0012] Furthermore, the length of the movable plate is greater than or equal to two-thirds of the sleeve length.

[0013] The beneficial effects of this utility model are as follows: 1. A rotatable sleeve is installed inside the discharge pipe, and its rotation is driven by a connecting device. This can directly disrupt the coal powder accumulation balance at the blockage point. The movable plate hinged to the inner wall of the sleeve can change the opening angle by adjusting the bolts, forming a spiral disturbance, which further enhances the unblocking ability and effectively solves the blockage problem.

[0014] 2. The drive unit adopts a plug-in hole and lever design, allowing operators to manually rotate the connecting pipe to drive the sleeve. The adjusting bolt can finely adjust the angle of the movable plate to adapt to different degrees of blockage. No complicated tools are required, which reduces the difficulty of operation and improves the response speed.

[0015] 3. A retaining ring is installed inside the discharge pipe, and the thickness of the retaining ring is equal to the thickness of the sleeve to ensure that the sleeve is installed flat and stable and to avoid shaking. The connecting pipe rotates coaxially with the discharge pipe through the bearing, which greatly reduces the friction and ensures the smoothness and reliability of the sleeve rotation process.

[0016] 4. The thickness of the movable plate is less than or equal to the depth of the opening slot to avoid interference during normal material feeding. The bottom of the opening slot is flush with the connecting plate to facilitate the discharge of accumulated coal powder. The magnetic adsorption design ensures the stability of the movable plate in the non-drained state. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view structural diagram of the present utility model; Figure 3 This is a schematic diagram of the internal cross-sectional structure of the sleeve of this utility model; Figure 4 This is a schematic diagram of the positional structure of the movable plate of this utility model during deformation; Figure 5 This is a bottom view of the internal structure of the sleeve and the movable plate of this utility model; The components include: 1. Coal silo; 2. Discharge pipe; 201. Movable plate; 202. Sleeve; 203. Opening groove; 204. Retaining ring; 3. Connecting pipe; 301. Insertion hole; 302. Connecting plate; 4. Adjusting bolt; 5. Bearing. Detailed Implementation

[0018] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Example

[0020] like Figures 1 to 5 As shown: This utility model proposes a boiler feed pipe, mainly including a coal bin 1, which is used to load or temporarily store coal used by the boiler. In most cases, the coal bin 1 is an inverted funnel shape. A discharge pipe 2 is provided at the discharge end of the coal bin 1, and the discharge pipe 2 is generally cylindrical. An anti-blocking device is provided on the discharge pipe 2, which includes a sleeve 202 that is closely attached to the inner wall of the discharge pipe 2. The sleeve 202 can rotate along the axis inside the discharge pipe 2. When a blockage occurs, the rotating sleeve 202 can clear the inside of the discharge pipe 2.

[0021] A connecting device is provided at the bottom of the sleeve 202, which is used to drive the sleeve 202 to rotate inside the discharge pipe 2. The connecting device includes a connecting pipe 3 sleeved on the outside of the discharge pipe 2, and the bottom of the connecting pipe 3 is securely connected to the bottom of the sleeve 202 by a connecting plate 302. Simultaneously, a driving device is provided at one end of the connecting pipe 3, which drives the connecting pipe 3 to rotate, thereby enabling the sleeve 202 to rotate within the discharge pipe 2.

[0022] To ensure accurate and stable installation of the sleeve 202 within the discharge pipe 2, a retaining ring 204 is installed inside the discharge pipe 2, with the top of the sleeve 202 tightly abutting against the lower part of the retaining ring 204. Furthermore, the thickness of the retaining ring 204 is equal to the thickness of the sleeve 202. This design makes the installation of the sleeve 202 within the discharge pipe 2 more even and stable, facilitating smooth operation of the sleeve 202 during rotation and preventing shaking caused by unstable installation, which could affect the anti-clogging effect. Simultaneously, it prevents the sleeve 202 from protruding from the retaining ring 204, thus preventing obstruction of material flow and ensuring smooth material discharge.

[0023] The driving device includes a insertion hole 301 on the outer wall of the connecting pipe 3. This insertion hole 301 is used to insert a lever. In case of blockage, the operator can insert the lever into the insertion hole 301 and manually rotate the lever to drive the connecting pipe 3 to rotate, thereby driving the sleeve 202 to rotate inside the discharge pipe 2. To enable the connecting pipe 3 to rotate more smoothly, a bearing 5 is sleeved on the outer wall of the discharge pipe 2. The connecting pipe 3 rotates coaxially with the discharge pipe 2 through the bearing 5. This design greatly reduces the friction when the connecting pipe 3 rotates, reduces the difficulty of operation, and improves the flexibility of rotation.

[0024] To improve efficiency during unblocking, an opening groove 203 is machined on the inner wall of the sleeve 202, with the bottom of the opening groove 203 flush with the bottom of the sleeve 202. A movable plate 201 is hinged inside the opening groove 203, and a through hole is provided at the bottom of the opening groove 203. An adjusting bolt 4 is screwed to the lower part of the connecting pipe 3, with one end of the adjusting bolt 4 passing through the through hole and abutting against the lower part of the movable plate 201. By rotating the adjusting bolt 4, the abutting force of the adjusting bolt 4 against the movable plate 201 can be changed, thereby controlling the opening angle of the movable plate 201. The vertical side of the opening groove 203 is hinged to the side of the movable plate 201, and the through hole is located on the side away from the hinge between the opening groove 203 and the movable plate 201. Specifically, the adjusting bolt 4 acts on the lower right corner of the movable plate 201, such as... Figure 4As shown, when a blockage occurs, rotating the adjusting bolt 4 causes the lower right part of the movable plate 201 to be acted upon by the adjusting bolt 4. Because the inside of the sleeve 202 is blocked by coal, when the adjusting bolt 4 is rotated towards the sleeve 202, the lower right part of the movable plate 201 will first tilt towards the axis. Since the upper part of the movable plate 201 has less room for deformation, when the adjusting bolt 4 is first rotated, the deformation of the upper part of the movable plate 201 is less than that of the bottom. At this time, the movable plate 201 temporarily forms a spiral plate with a movable arc. Then, rotating the connecting pipe 3 and the sleeve 202 causes the movable plate 201 to compress the coal powder at the blockage, breaking the balance at the blockage inside the feed pipe, thereby clearing the blockage. After unblocking, there is no pressure between the movable plate 201 and the adjusting bolt 4, so the adjusting bolt 4 needs to be reset. The hinged movable plate 201 increases the rotation space. The lower part of the opening groove 203 is flush with the connecting plate 302, which can discharge the coal powder accumulated between the movable plate 201 and the opening groove 203. A magnet is provided at the bottom of the opening groove 203 to attract the movable plate 201 and ensure the stability during normal material feeding.

[0025] The thickness of the movable plate 201 is less than or equal to the depth of the opening slot 203 to ensure that it will not interfere during normal material feeding and reduce the chance of blockage. The length of the movable plate 201 is greater than or equal to two-thirds of the length of the sleeve 202. This design allows the movable plate 201 to generate a large disturbance to the coal powder in the discharge pipe 2 when it is opened, effectively destroying the coal powder structure at the blockage site and promoting the flow of coal powder.

[0026] In actual use, when the discharge pipe 2 becomes blocked, the operator first inserts the lever into the insertion hole 301 on the outer wall of the connecting pipe 3, and then rotates the lever to drive the connecting pipe 3 to rotate. Since the connecting pipe 3 and the sleeve 202 are connected by the connecting plate 302, and the connecting pipe 3 rotates coaxially with the discharge pipe 2 through the bearing 5, the sleeve 202 will rotate accordingly inside the discharge pipe 2. If the blockage can be cleared during the rotation, production can continue. If it cannot be cleared, the adjusting bolt 4 needs to be rotated. Under the action of the adjusting bolt 4, the lower part of the movable plate 201 will have a certain opening angle. Then, by rotating the connecting pipe 3, the movable plate 201, along with the rotation of the sleeve 202, continuously disturbs the coal powder in the discharge pipe 2, destroying the coal powder structure at the blockage point, allowing the coal powder to flow again, thereby achieving the purpose of clearing the discharge pipe 2. If the blockage is more serious, the operator can increase the opening angle of the movable plate 201 by rotating the adjusting bolt 4, enhancing the disturbance effect of the movable plate 201 on the coal powder, and further improving the unblocking effect. By setting a rotatable sleeve 202 and an adjustable movable plate 201 on the inner wall of the sleeve 202, the unblocking method can be flexibly adjusted according to different blockage conditions. This effectively solves the problems of cumbersome operation and poor effect of existing unblocking methods, greatly improves the efficiency of handling coal bunker blockage in thermal power plants, and ensures the normal operation of power plant boilers.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A boiler feed pipe, comprising a coal bin, wherein a feed pipe is provided at the discharge end of the coal bin, characterized in that, The discharge pipe is equipped with an anti-blocking device, which includes a sleeve that is closely attached to the inner wall of the discharge pipe. The bottom of the sleeve is provided with a connecting device, which is used to drive the sleeve to rotate inside the discharge pipe; The connecting device includes a connecting pipe sleeved on the outside of the discharge pipe, the bottom of the connecting pipe being connected to the bottom of the sleeve via a connecting plate, and a driving device being provided at one end of the connecting pipe. The driving device includes a plug hole on the outer wall of the connecting pipe for inserting a lever. A bearing is sleeved on the outer wall of the discharge pipe, and the connecting pipe rotates coaxially with the discharge pipe through the bearing.

2. The feed pipe of the boiler according to claim 1, characterized in that, The discharge pipe is equipped with a retaining ring inside, and the top of the sleeve abuts against the bottom of the retaining ring.

3. The feed pipe of the boiler according to claim 2, characterized in that, The thickness of the retaining ring is equal to the thickness of the sleeve.

4. The feed pipe of the boiler according to claim 1, characterized in that, The inner wall of the sleeve is provided with an opening groove, the bottom of the opening groove is flush with the bottom of the sleeve, a movable plate is hinged inside the opening groove, a through hole is provided at the bottom of the opening groove, and an adjusting bolt is screwed to the lower part of the connecting pipe, one end of the adjusting bolt passes through the through hole and abuts against the lower part of the movable plate.

5. The feed pipe of the boiler according to claim 4, characterized in that, The vertical side of the opening groove is hinged to the side of the movable plate, the through hole is located on the side away from the hinge of the opening groove and the movable plate, and the thickness of the movable plate is less than or equal to the depth of the opening groove.

6. The feed pipe of the boiler according to claim 4, characterized in that, The length of the movable plate is greater than or equal to two-thirds of the sleeve length.

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