Continuous automatic separation device for large-particle-size coal gangue sundries of fire coal conveying system

Abstract

The utility model discloses a continuous automatic separation device for large-particle-size coal gangue sundries of a fire coal conveying system, a box body is arranged at the tail end of a coal conveying belt of the fire coal conveying system, the coal conveying belt and a rotary roller at the end of the coal conveying belt jointly extend into the box body, and a rotating shaft is arranged in the box body in the direction perpendicular to the running direction of the coal conveying belt; the rotating shaft is positioned obliquely below the tail end of the coal conveying belt; a plurality of separation cutter sets are arranged on the rotating shaft in the circumferential direction at intervals, each separation cutter set is composed of a plurality of separation teeth arranged on the rotating shaft in the axial direction at equal intervals, and the distance between every two adjacent separation teeth is smaller than the particle size of large-particle-size coal gangue sundries; and the bottom of the box body is divided into a qualified fire coal discharging barrel and a large-particle-size coal gangue impurity discharging barrel. The separating device is mainly used for separating and removing large-particle-size gangue, wood chips and other impurities mixed in coal from a fuel system, it is guaranteed that the quality of fire coal entering the next stage is qualified, the boiler combustion requirement is met, safe and stable operation of a coal conveying system coal falling pipe, screening and crushing equipment and a boiler is greatly improved, long-period safe operation of a unit can be guaranteed, and the energy consumption is reduced. And the equipment maintenance cost is reduced, the unit output is reduced, and non-planned shutdown is realized.

Description

Technical Field

[0001] This application relates to the field of coal-fired power generation technology, and in particular to a continuous automatic separation device for large-particle coal gangue debris in a coal conveying system. Background Technology

[0002] Currently, the main coal types entering the plant are raw coal and low-calorific-value coal produced by the coal mines. The average gangue content in the raw coal reaches more than 10%, and the particle size of large-diameter gangue is generally above 120mm. At the same time, it is mixed with other impurities such as wood chips. During the process of transporting the mixture of coal and impurities to the combustion system, it causes problems such as accelerated wear of fuel system equipment, damage to conveyor belts, and difficulty in controlling the particle size of coal entering the furnace. In addition, all the unqualified particles in the coal entering the furnace are white gangue, which affects the safe and stable operation of the boiler.

[0003] The fuel system of a coal-fired pithead power plant is equipped with coarse or fine crushing and screening facilities (including coarse roller screen + ring hammer crusher + fine roller screen + reversible hammer crusher + inspection screen). It is possible to replace and upgrade the crushing and screening equipment to increase the output capacity of the equipment and improve the crushing capacity of gangue and debris, so as to solve the problem of accelerated wear of fuel system equipment. However, the equipment operation safety cannot be met, the energy consumption is high, and the maintenance workload and cost are high. Summary of the Invention

[0004] To address the aforementioned problems, this application aims to provide a continuous automatic separation device for large-particle coal gangue and other impurities in a coal conveying system. This device can separate impurities during the coal flow, ensuring that the coal entering the next stage meets the quality requirements for boiler combustion. It significantly improves the safe and stable operation of the coal conveying system's coal chute, screening equipment, and boiler, and can guarantee the long-term safe operation of the unit, reduce equipment maintenance costs, reduce unit output, and minimize unplanned shutdowns.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A continuous automatic separation device for large-particle-size coal gangue debris in a coal conveying system, wherein a box is provided at the end of the coal conveyor belt of the coal conveying system, and the end of the coal conveyor belt extends into the box. A rotating shaft is arranged inside the box perpendicular to the operating direction of the coal conveyor belt, and the rotating shaft is located obliquely below the end of the coal conveyor belt. Multiple separating blade groups are arranged circumferentially on the rotating shaft, and each separating blade group is composed of the rotating shaft. The structure consists of multiple separating teeth evenly spaced along the upper axis, with the distance between adjacent separating teeth being smaller than the particle size of large-diameter coal gangue debris. The bottom of the box is divided into a qualified coal discharge cylinder and a large-diameter coal gangue debris discharge cylinder. When the coal at the end of the coal conveyor belt falls, the qualified coal smaller than the spacing between the separating teeth falls directly into the qualified coal discharge cylinder, while the large-diameter coal gangue debris larger than the spacing between the separating teeth is driven by the rotation of adjacent separating teeth and falls into the large-diameter coal gangue debris discharge cylinder.

[0006] Preferably, each of the separating teeth is a sickle-shaped structure that is bent toward its rotation direction, and the side of the separating tooth in the rotation direction is set as a sawtooth structure.

[0007] Preferably, an assembly plate is provided on the inner wall of the box body relative to the end of the coal conveyor belt. Multiple rejection teeth are fixed at equal intervals on the assembly plate, and when the separating blade group rotates, each rejection tooth extends into the space between adjacent separating teeth.

[0008] Preferably, the removal teeth are arranged in an inclined posture with the upper end higher and the lower end lower, so that the separating teeth gradually overlap from the outer end to the inner end of the removal teeth.

[0009] Preferably, the removing teeth have a downward-curving sickle-shaped structure.

[0010] The beneficial effects of this application are:

[0011] 1. This separation device is mainly used to separate and remove large-diameter gangue, wood chips and other impurities mixed in with the coal in the fuel system. The separation device is installed in the fuel system to separate impurities during the high-speed coal flow, ensuring that the coal entering the next stage is of qualified quality and meets the combustion requirements of the boiler. It has a significant improvement on the safe and stable operation of the coal conveying system, coal chute, screening equipment and boiler. It can ensure the long-term safe operation of the unit, reduce equipment maintenance costs, reduce unit output and unplanned shutdowns.

[0012] 2. After large-diameter gangue is discharged, the actual amount of qualified coal entering the plant will decrease, thereby reducing the coal purchase cost of the coal-fired power plant.

[0013] 3. This separation technology can provide an effective solution for low-calorific-value coal-fired power plants currently suffering from excessive particle size. Attached Figure Description

[0014] Figure 1 This is a diagram of the current mixed coal transportation structure.

[0015] Figure 2 This diagram shows the current process of transporting mixed coal, where it detaches from the end of the coal conveyor belt and falls into the combustion chamber.

[0016] Figure 3 A diagram of the separation blade assembly is provided for this application.

[0017] Figure 4 This is a planar structural diagram of the separation blade assembly in this application.

[0018] Figure 5 This diagram illustrates the separation of large-diameter coal gangue from mixed coal using the separation blade assembly in this application.

[0019] Figure 6 This is a diagram of large-diameter coal gangue being held in a separating tooth according to this application.

[0020] Figure 7 Remove the tooth pattern for this application.

[0021] Figure 8 This diagram shows the removal of coal gangue held in place by the overlapping of the removal and separation teeth in this application.

[0022] Figure 9 This is a diagram showing the location of the removal teeth inside the housing in this application.

[0023] In the diagram: 1-Coal conveyor belt; 2-Rotating roller; 3-Dust cover; 31-Coal feeding cylinder; 4-Box body; 41-Qualified coal discharge cylinder; 42-Large-diameter coal gangue and other debris discharge cylinder; 5-Rotating shaft; 6-Separating knife set; 61-Separating teeth; 7-Assembly plate; 8-Removing teeth. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] The current coal transportation structure is as follows: Figure 1-2 As shown, the coal mixture is transported from the right side to the left side of the coal conveyor belt 1. After reaching the left side, it detaches from the conveyor belt and falls. A dust cover 3 is installed at the front of the coal conveyor belt 1 to prevent coal dust generated during the descent of the coal. At the bottom of the dust cover 3, a coal inlet cylinder 31 is installed, and the combustion system is connected to the bottom of the coal inlet cylinder 31.

[0026] To address the impact of large-particle coal gangue impurities in fuel coal on combustion systems, this application provides a device for separating coal gangue impurities from fuel coal, such as... Figure 3 As shown, the coal conveyor belt of the coal conveying system is provided with a box 4 at the end. The box 4 replaces the dust cover 3. The coal conveyor belt 1 and the rotary roller 2 at its end extend into the box 4 so that the transported fuel coal mixture enters the box 4 for separation under the dust protection effect.

[0027] like Figure 3-5As shown, a rotating shaft 5 is installed inside the housing 4 perpendicular to the operating direction of the coal conveyor belt, and the rotating shaft 5 is located obliquely below the end of the coal conveyor belt. Multiple separating blade groups 6 are arranged circumferentially on the rotating shaft 5. Each separating blade group 6 is composed of multiple separating teeth 61 arranged axially at equal intervals on the rotating shaft 5. The distance between adjacent separating teeth 61 is smaller than the particle size of large-diameter coal gangue debris. The bottom of the housing 4 is divided into a qualified coal discharge cylinder 41 and a large-diameter coal gangue debris discharge cylinder 42. The separation operation is as follows: The coal conveyor belt 1 continuously transports the coal mixture from the rotary roller 2 and drops it onto the rotating separation blade assembly 6 (which is driven by a motor to rotate the shaft 5, thereby rotating the separation blade assembly 6). Qualified coal smaller than the spacing of the separation teeth 61 falls directly into the qualified coal discharge cylinder 41 at the bottom through the gap between adjacent separation teeth 61, and into the combustion system; while large-diameter coal gangue debris larger than the spacing of the separation teeth 61 is driven by the rotation of adjacent separation teeth 61 and falls into the large-diameter coal gangue debris discharge cylinder 42. A conveyor belt can be set on the lower side to transport it to an open space for storage. Thus, through this separation device, large-diameter coal gangue debris is removed synchronously and continuously during the continuous transport of the coal mixture, thereby effectively solving the problems of increased wear on fuel system equipment, damage to conveyor belts, difficulty in controlling the particle size of coal entering the furnace, and affecting the safe and stable operation of the boiler caused by large-diameter coal gangue debris.

[0028] To improve the separation efficiency of large-particle coal gangue and other impurities, such as Figure 3 As shown, each of the separating teeth 61 is a sickle-shaped structure that bends in its rotation direction, that is, a curved arc structure, so that the outer end of the separating tooth 61 is higher than the inner end in the radial direction. During the rotation of the separating tooth 61, the coal gangue falling in will slide off the separating tooth 61 due to the centrifugal force. Therefore, the sickle-shaped structure, with its gradually increasing outer end, resists the centrifugal force of the coal gangue. Compared with the straight separating tooth 61, it can effectively limit the coal gangue from falling out under the action of centrifugal force, thereby avoiding the problem of the coal gangue falling into the qualified coal discharge cylinder 41 after centrifugal separation.

[0029] Furthermore, to overcome the slippage of coal gangue on the separating teeth 61 due to centrifugal force, such as... Figure 3 As shown, the side of the separating tooth 61 in the direction of rotation is set as a sawtooth structure. This sawtooth structure increases the contact resistance with the coal gangue, thereby further overcoming the centrifugal force of the coal gangue and preventing the coal gangue from falling off the separating tooth 61.

[0030] like Figure 6As shown, during the rotational removal via the separating teeth 61, coal gangue with a spacing equivalent to that between the separating teeth 61 is clamped between the side walls of adjacent separating teeth 61. When the coal gangue is rotated to the top of the large-particle coal gangue discharge cylinder 42, it cannot fall off smoothly due to the clamping force and is continued to rotate by the separating teeth 61. This not only increases the rotational gravity of the separating teeth 61, but also increases the amount of coal gangue clamped, thus blocking the gap between adjacent separating teeth 61. As a result, qualified coal falls into the large-particle coal gangue discharge cylinder 42 without being driven by rotation and is discharged as debris, causing a large waste of coal. Therefore, to solve this problem, such as Figure 7-8 As shown, the inner wall of the box 4 relative to the end of the coal conveyor belt is provided with an assembly plate 7 (preferably fixed by welding or bolts). Multiple rejection teeth 8 are fixed at equal intervals on the assembly plate 7 (each rejection tooth 8 is preferably detachably connected by bolts, and can be replaced after long-term wear and damage). When the separating knife group rotates, each rejection tooth 8 extends into the space between adjacent separating teeth 61. After the coal gangue is clamped between the separating teeth 61, under the rotation, when the removing tooth 8 enters and overlaps with the separating teeth 61, the separating teeth 61 contact the clamped coal gangue and remove it from the separating teeth 61. During the continuous rotation of the separating knife group 6, it falls from the adjacent separating knife group 6 into the lower large-particle coal gangue debris discharge cylinder 42 and is discharged. Therefore, the clamped coal gangue can be removed by the removing tooth 8, avoiding the increase of the rotation resistance of the rotating shaft 5, and the waste caused by the discharge of qualified coal mixed debris after the separating teeth 61 are blocked by coal gangue.

[0031] If a large amount of coal gangue is held between a single separating tooth 61, the resistance to removal by the removing tooth 8 contacting multiple coal gangue increases, which also increases the rotational resistance of the rotating shaft 5. Therefore, to solve this problem, such as Figure 9 As shown, the rejection teeth 8 are arranged in an inclined posture with the upper end higher and the lower end lower, so that the separating teeth 61 gradually overlap from the outer end to the inner end along the direction of the rejection teeth 8. Figure 9 As shown, during the clockwise rotation of the separating tooth 61, the outer end of the removing tooth 8 first enters the gap of the separating tooth 61 to remove the coal gangue near the rotating shaft 5. As the rotating shaft 5 continues to rotate, the portion of the removing tooth 8 facing the assembly plate 7 gradually enters the separating tooth 61 to sequentially remove the coal gangue held towards the outer end of the separating tooth 61. This effectively avoids the resistance to the rotating shaft 5 caused by the simultaneous removal of multiple coal gangue by the entire length of the removing tooth 8 entering the gap of the separating tooth 61. The removing tooth has a downward-curving sickle-shaped structure to further reduce the resistance to the rotating shaft 5 caused by the simultaneous removal of multiple coal gangue.

[0032] The principle of this application is as follows: A separation device is installed at the head of the coal conveyor belt in a coal-fired power plant. The original dust cover at the head of the belt is removed. The separating blade group 6 runs in the opposite direction to the coal flow. When large-diameter gangue and debris fall into the separating teeth 61, the debris is removed, and qualified coal enters the next stage conveyor belt. The operation of the separating blade group 6 is interlocked with the coal conveyor belt and can be frequency-controlled. It can be shut down or run in the same direction as the coal flow when the coal quality is qualified, without affecting the conveyor belt's coal transport. Undersize coal falls directly into the finished product conveyor belt and enters the boiler, while oversize large-diameter gangue and other debris are transported to an open area outside the crushing plant for secondary processing.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope of protection, and all such changes and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A continuous automatic separation device for large-particle coal gangue and other debris in a coal conveying system, characterized in that, The coal conveyor belt of the coal conveying system is equipped with a box at its end, and the end of the coal conveyor belt extends into the box. A rotating shaft is installed inside the box, perpendicular to the operating direction of the coal conveyor belt, and the rotating shaft is located diagonally below the end of the coal conveyor belt. Multiple separating blade groups are arranged circumferentially on the rotating shaft. Each separating blade group consists of multiple separating teeth arranged axially at equal intervals on the rotating shaft. The distance between adjacent separating teeth is smaller than the particle size of large-diameter coal gangue debris. The bottom of the box is divided into a qualified coal discharge cylinder and a large-diameter coal gangue debris discharge cylinder. When the coal at the end of the coal conveyor belt falls, qualified coal smaller than the distance between the separating teeth falls directly into the qualified coal discharge cylinder, while large-diameter coal gangue debris larger than the distance between the separating teeth is driven by the rotation of adjacent separating teeth and falls into the large-diameter coal gangue debris discharge cylinder.

2. The separation device according to claim 1, characterized in that: Each of the separating teeth is a sickle-shaped structure that bends toward its rotation direction, and the side of the separating tooth in the rotation direction is set as a sawtooth structure.

3. The separation device according to claim 2, characterized in that: An assembly plate is provided on the inner wall of the box body relative to the end of the coal conveyor belt. Multiple rejection teeth are fixed at equal intervals on the assembly plate, and when the separating blade group rotates, each rejection tooth extends into the space between adjacent separating teeth.

4. The separation device according to claim 3, characterized in that: The removal teeth are set in an inclined posture with the upper end higher and the lower end lower, so that the separating teeth gradually overlap from the outer end to the inner end of the removal teeth.

5. The separation device according to claim 4, characterized in that: The removal teeth have a downward-curving sickle-shaped structure.

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