Pulverized coal anti-blocking device

Abstract

The utility model discloses a pulverized coal anti-blocking device, and belongs to the technical field of filtration. According to the embodiment of the utility model, the pulverized coal anti-blocking device comprises a pulverized coal feeder, a filtering and crushing box, an air and pulverized coal mixer and an air supply pipe, and the pulverized coal feeder is used for conveying pulverized coal; the filtering and crushing box is arranged at the bottom of the powder feeder and is communicated with the powder feeder, a conveying belt is arranged in the middle of the filtering and crushing box, the conveying belt is a filter screen fully paved with small holes, and a crushing roller is arranged at the bottom of the output end of the conveying belt; the wind powder mixer is communicated with the filtering and crushing box through a powder conveying pipe; the air supply pipe is communicated with the air and powder mixer and blows pulverized coal in the air and powder mixer to a hearth. According to the device, pulverized coal can be well screened out, and large-particle impurities are crushed, so that the pulverized coal conveying pipe is prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, and particularly relates to a coal powder anti-blocking device. Background Art

[0002] Before coal powder is burned, it needs to be transported through a coal feeder and a pulverized coal-air mixer. The coal powder at the coal feeder is transported to the pulverized coal-air mixer through a powder conveying pipe. Usually, the powder conveying pipe has a structure that is larger at the top and smaller at the bottom. When caking or spontaneous combustion occurs to generate coke lumps in the coal powder at the coal feeder or the powder conveying pipe, or when other larger sundries, such as wood, woven bags, metal sundries, rubber sheets, etc., blockage will occur in the pipe section at the pulverized coal-air mixer, affecting the transportation of coal powder. At this time, it is necessary to deal with it by dredging the pipeline. First, it affects the overall load of the unit. Second, the maintenance cost increases. Third, it affects civilized production. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a coal powder anti-blocking device, which can well screen out coal powder and crush large particle sundries, thereby preventing the powder conveying pipe from being blocked.

[0004] The coal powder anti-blocking device according to an embodiment of the utility model includes a coal feeder, a filtering and crushing box, a pulverized coal-air mixer, and an air supply pipe. The coal feeder is used for transporting coal powder. The filtering and crushing box is arranged at the bottom of the coal feeder and is communicated with the coal feeder. A conveyor belt is arranged in the middle of the filtering and crushing box. The conveyor belt is a filter screen covered with small holes. A crushing roller is arranged at the bottom of the output end of the conveyor belt. The pulverized coal-air mixer is communicated with the filtering and crushing box through a powder conveying pipe. The air supply pipe is communicated with the pulverized coal-air mixer to blow the coal powder in the pulverized coal-air mixer into the furnace.

[0005] The coal powder anti-blocking device according to an embodiment of the utility model, by setting like this, can achieve at least the following beneficial effects: After the coal powder from the coal feeder is transported to the filtering and crushing box, the fine coal powder directly filters down through the conveyor belt, while the large coal blocks or sundries are conveyed by the conveyor belt to the crushing roller at the end for crushing treatment. The coal powder enters the pulverized coal-air mixer from the powder conveying pipe and is blown into the furnace by the air in the air supply pipe for combustion. By setting like this, the fine coal powder can be filtered out and enter the coal powder, while the larger coal blocks or sundries are crushed, so that the powder conveying pipe will not be blocked, ensuring the working efficiency.

[0006] According to some embodiments of the utility model, the output end of the conveyor belt is arranged on one side of the filtering and crushing box.

[0007] According to some embodiments of the utility model, the powder conveying pipe is arranged at the bottom of the side of the filtering and crushing box.

[0008] According to some embodiments of the present utility model, the side of the filtering and pulverizing box facing the powder conveying pipe is inclined.

[0009] According to some embodiments of the present utility model, it further includes a driving motor, and the driving motor is connected to the driving roller at the output end of the conveyor belt to drive the driving roller to rotate.

[0010] According to some embodiments of the present utility model, the pulverizing roller includes a main pulverizing roller and a secondary pulverizing roller. Gears that mesh with each other are arranged on the rotating shafts of the main pulverizing roller and the secondary pulverizing roller, and the main pulverizing roller is in transmission connection with the driving roller at the output end of the conveyor belt.

[0011] According to some embodiments of the present utility model, the main pulverizing roller and the driving roller at the output end of the conveyor belt are connected by a belt in transmission.

[0012] According to some embodiments of the present utility model, an air damper and an adjustable throttle hole are arranged on the air supply pipe.

[0013] According to some embodiments of the present utility model, it further includes a PLC controller and a measuring device. The measuring device is arranged inside the air-powder mixer to measure the pulverized coal concentration and flow rate inside the air-powder mixer, and the PLC controller adjusts the opening degrees of the air damper and the adjustable throttle hole according to the pulverized coal concentration and flow rate measured by the measuring device.

[0014] According to some embodiments of the present utility model, it further includes a waste discharge pipe, and the waste discharge pipe is arranged at the bottom of the pulverizing roller.

[0015] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0016] The above additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0017] Figure 1 is a schematic diagram of the overall structure of the pulverized coal anti-blocking device according to an embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of the structure of the filtering and pulverizing box according to an embodiment of the present utility model;

[0019] Figure 3 is Figure 2 an enlarged schematic diagram of the structure of part A in

[0020] Reference numerals: 1, coal feeder; 2, filtering and pulverizing box; 3, powder conveying pipe; 4, air-powder mixer; 5, furnace; 6, conveyor belt; 7, driving roller; 8, driving motor; 9, belt; 10, main pulverizing roller; 11, auxiliary pulverizing roller; 12, gear; 13, air supply pipe; 14, primary air header; 15, impurity discharge pipe. Detailed implementation manners

[0021] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, it should be understood that for the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0024] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0025] The following refers to Figures 1 to 3 to describe the coal powder anti-blocking device according to the embodiments of the present utility model.

[0026] The coal powder anti-blocking device according to the embodiments of the present utility model includes a coal feeder 1, a filtering and pulverizing box 2, an air-powder mixer 4 and an air supply pipe 13. The coal feeder 1 is used for conveying coal powder; the filtering and pulverizing box 2 is arranged at the bottom of the coal feeder 1 and is communicated with the coal feeder 1. A conveyor belt 6 is arranged in the middle of the filtering and pulverizing box 2. The conveyor belt 6 is a filter screen covered with small holes. A pulverizing roller is arranged at the bottom of the output end of the conveyor belt 6; the air-powder mixer 4 is communicated with the filtering and pulverizing box 2 through a powder conveying pipe 3; the air supply pipe 13 is communicated with the air-powder mixer 4 to blow the coal powder in the air-powder mixer 4 into the furnace 5.

[0027] For example Figures 1 to 3 As shown, the filtering and pulverizing box 2 is located at the bottom of the coal feeder 1. The pulverized coal conveyed by the coal feeder 1 first enters the filtering and pulverizing box 2 and falls onto the conveyor belt 6. Among the pulverized coal conveyed by the coal feeder 1, the fine pulverized coal first passes through the filter screen and drops below the conveyor belt 6, and then enters the air-powder mixer 4 through the powder conveying pipe 3. The air supply pipe 13 is connected to the air-powder mixer 4, and the pulverized coal in the air-powder mixer 4 can be blown into the furnace 5 for combustion. The coal blocks or large-particle sundries such as wood, woven bags, metal sundries, rubber, etc. are conveyed on the conveyor belt 6 to the pulverizing roller at the end of the conveyor belt 6 for pulverization. After becoming small particles, they enter the air-powder mixer 4 through the powder conveying pipe 3 or are collected through another pipeline and re-screened.

[0028] It should be noted that the air supply pipe 13 is connected to the air-powder mixer 4 to blow the pulverized coal in the air-powder mixer 4 into the furnace 5. Due to the existence of the air supply pipe 13, the inside of the air-powder mixer 4 can always be in a negative pressure state, so that the pulverized coal in the filtering and pulverizing box 2 can enter the air-powder mixer 4 more conveniently, and then enter the furnace 5 under the blowing of the wind for combustion.

[0029] Furthermore, it also includes a primary air main pipe 14, and the primary air main pipe 14 is connected to a plurality of air supply pipes 13 together, and can supply air to multiple devices simultaneously.

[0030] According to the pulverized coal anti-blocking device of the embodiment of the present invention, fine pulverized coal can be screened out and enter the powder conveying pipe 3, while larger coal blocks or other sundries enter the pulverizing roller for pulverization to prevent the powder conveying pipe 3 from being blocked. And due to the blowing of the air supply pipe 13, under the action of negative pressure, the pulverized coal can enter the air-powder mixer 4 conveniently, avoiding blockage.

[0031] At the same time, the air flow blown out by the air supply pipe 13 can drive the pulverized coal, and at the same time, the pulverized coal in the powder conveying pipe 3 will also more easily fall into the air-powder mixer 4 under the action of its own gravity.

[0032] In summary, under the triple action of the driving action of the air flow blown out by the air supply pipe 13, the gravity of the pulverized coal itself, and the negative pressure of the air-powder mixer 4, the pulverized coal can completely fall from the powder conveying pipe 3 into the air-powder mixer 4 to prevent blockage.

[0033] In some specific embodiments of the present invention, the output end of the conveyor belt 6 is arranged on one side of the filtering and pulverizing box 2.

[0034] For example Figure 2As shown, the output end of the conveyor belt 6 is arranged on one side of the filtering and pulverizing box 2, so that the length of the conveyor belt 6 can be as long as possible. The length of the conveyor belt 6 is long enough so that the pulverized coal on the conveyor belt 6 can fully fall from the filter screen to the bottom of the filtering and pulverizing box 2, and then enter the pulverized coal-air mixer 4 through the powder conveying pipe 3 under the action of negative pressure.

[0035] In some specific embodiments of the present utility model, the powder conveying pipe 3 is arranged at the bottom of the side of the filtering and pulverizing box 2.

[0036] For example Figure 1 As shown, the powder conveying pipe 3 is arranged at the bottom of the side of the filtering and pulverizing box 2, and both the powder conveying pipe 3 and the air supply pipe 13 are located below the output end of the conveyor belt 6, so that the coal blocks or large-particle sundries are easy to enter the pulverized coal-air mixer 4 through the powder conveying pipe 3 after being pulverized.

[0037] Furthermore, the bottom of the powder conveying pipe 3 is in an inverted frustum shape, wider at the top and narrower at the bottom, which is convenient for the pulverized coal to concentrate and enter the pulverized coal-air mixer 4.

[0038] In some specific embodiments of the present utility model, the filtering and pulverizing box 2 is inclined towards the side where the powder conveying pipe 3 is arranged.

[0039] For example Figure 1 As shown, the filtering and pulverizing box 2 is generally in a cuboid shape. The powder conveying pipe 3 and the output end of the conveyor belt 6 are arranged on the right side of the filtering and pulverizing box 2, then the filtering and pulverizing box 2 is inclined towards the right side, so that the pulverized coal filtered by the conveyor belt 6 can slide to the right and is convenient to enter the powder conveying pipe 3.

[0040] In some specific embodiments of the present utility model, it further includes a driving motor 8, and the driving motor 8 is connected to the driving roller 7 at the output end of the conveyor belt 6 to drive the driving roller 7 to rotate.

[0041] For example Figure 1 and Figure 2 As shown, the driving motor 8 is arranged outside the filtering and pulverizing box 2 and connected to the filtering and pulverizing box 2. The output end of the driving motor 8 extends into the filtering and pulverizing box 2 and is connected to the driving roller 7 of the conveyor belt 6 to drive the driving roller 7 to rotate and then drive the conveyor belt to move.

[0042] By arranging the main body of the driving motor 8 outside the filtering and pulverizing box 2 and connecting the output end to the driving roller 7, it is avoided that the pulverized coal enters the driving motor 8 and affects the use of the driving motor 8.

[0043] In some specific embodiments of the present utility model, the pulverizing roller includes a main pulverizing roller 10 and a secondary pulverizing roller 11. Gears 12 that mesh with each other are arranged on the rotating shafts of the main pulverizing roller 10 and the secondary pulverizing roller 11, and the main pulverizing roller 10 is in transmission connection with the driving roller 7 at the output end of the conveyor belt 6.

[0044] For example Figure 3 As shown, the crushing rollers include a main crushing roller 10 and a secondary crushing roller 11. The main crushing roller 10 is drivingly connected to the driving roller 7 of the conveyor belt 6. The driving roller 7 is connected to the output end of the driving motor 8. The main crushing roller 10 and the secondary crushing roller 11 are connected by mutually meshing gears 12, so that the rotation directions of the main crushing roller 10 and the secondary crushing roller 11 are opposite, and both rotate towards the direction between the main crushing roller 10 and the secondary crushing roller 11, enabling the sundries and coal lumps falling between the two crushing rollers to be clamped towards the space between the two crushing rollers for crushing operations.

[0045] Furthermore, the mutually meshing gears 12 are arranged on the side of the crushing roller and connected to the crushing roller shaft.

[0046] Furthermore, the distance between the main crushing roller 10 and the secondary crushing roller 11 can be set as required, thereby controlling the size of the crushed coal lumps and sundries.

[0047] Furthermore, a number of mutually cooperating protrusions and grooves can be arranged at intervals along the axial direction of the main crushing roller 10 and the secondary crushing roller 11, so as to more fully crush the coal lumps and large particle sundries.

[0048] In some specific embodiments of the present utility model, the main crushing roller 10 and the driving roller 7 at the output end of the conveyor belt 6 are drivingly connected by a belt 9.

[0049] For example Figure 3 As shown, the main crushing roller 10 and the driving roller 7 at the output end of the conveyor belt 6 are drivingly connected by a belt 9 to ensure the stability of the connection.

[0050] In some specific embodiments of the present utility model, a damper and an adjustable throttling orifice are provided on the air supply pipe 13.

[0051] The provision of a damper and an adjustable throttling orifice on the air supply pipe 13 enables the air supply intensity of the air supply pipe 13 to be adjusted, thereby adjusting the air velocity according to the coal powder input amount, so that a larger air velocity can be selected to blow the coal powder into the furnace 5 when there is more coal powder. When the amount of coal powder is less, the air velocity can be reduced to avoid wasting electricity and at the same time create good combustion conditions for full combustion.

[0052] In some specific embodiments of the present utility model, a PLC controller and a measuring device are further included. The measuring device is arranged in the air powder mixer 4 to measure the coal powder concentration and flow velocity in the air powder mixer 4. The PLC controller adjusts the opening degrees of the damper and the adjustable throttling orifice according to the coal powder concentration and flow velocity measured by the measuring device.

[0053] The measuring device is arranged inside the pulverized coal-air mixer 4. The measuring device includes a pulverized coal concentration measuring unit and a pulverized coal flow rate measuring unit, and the pulverized coal concentration and the pulverized coal flow rate inside the pulverized coal-air mixer 4 are measured through the pulverized coal concentration measuring unit and the pulverized coal flow rate measuring unit. The PLC controller adjusts the opening degrees of the air damper and the adjustable choke according to the pulverized coal concentration and flow rate measured by the measuring device, so that the pulverized coal concentration and flow rate inside the pulverized coal-air mixer 4 are controlled at a stable value, so that the air-fuel ratio inside the furnace 5 reaches the optimal value, achieving the best combustion effect and improving the safety, economy and environmental protection of the furnace 5.

[0054] In some specific embodiments of the present invention, a waste discharging pipe 15 is further included, and the waste discharging pipe 15 is arranged at the bottom of the crushing roller.

[0055] For example Figure 1 and Figure 2 As shown, the pulverized coal anti-blocking device further includes a waste discharging pipe 15, and the waste discharging pipe 15 is arranged at the bottom of the crushing roller and connected to the filtering and crushing box 2. The sundries crushed by the crushing roller can be discharged from the waste discharging pipe 15 for re-collection and utilization or discarded.

[0056] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A coal powder anti-blocking device, characterized in that: include: A pulverizer (1) for conveying pulverized coal; A filter crushing box (2), the filter crushing box (2) being arranged at the bottom of the powder feeder (1) and being connected to the powder feeder (1), a conveyor belt (6) being arranged in the middle of the filter crushing box (2), the conveyor belt (6) being a filter net covered with small holes, and a crushing roller being arranged at the bottom of the output end of the conveyor belt (6); An air-powder mixer (4), the air-powder mixer (4) being connected to the filtering and crushing box (2) via a powder conveying pipe (3); An air supply pipe (13), the air supply pipe (13) is connected to the air-powder mixer (4) and blows the coal powder in the air-powder mixer (4) toward the furnace (5).

2. The coal powder anti-blocking device according to claim 1, characterized in that: The output end of the conveyor belt (6) is arranged on a side of the filtering and crushing box (2).

3. The coal powder anti-blocking device according to claim 1, characterized in that: The powder conveying pipe (3) is arranged at the bottom of the side of the filtering and crushing box (2).

4. The coal powder anti-blocking device according to claim 3, characterized in that: The filtering and crushing box (2) is arranged to be inclined toward the side where the powder conveying pipe (3) is arranged.

5. The coal powder anti-blocking device according to claim 1, characterized in that: It also includes a driving motor (8), which is connected to a driving roller (7) at the output end of the conveyor belt (6) to drive the driving roller (7) to rotate.

6. The coal powder anti-blocking device according to claim 5, characterized in that: The crushing rollers include a main crushing roller (10) and a secondary crushing roller (11), and mutually meshing gears (12) are arranged on the rotating shafts of the main crushing roller (10) and the secondary crushing roller (11). The main crushing roller (10) is connected to a transmission roller (7) at the output end of the conveyor belt (6) by transmission.

7. The coal powder anti-blocking device according to claim 6, characterized in that: The main crushing roller (10) and the driving roller (7) at the output end of the conveyor belt (6) are connected by a belt (9).

8. The coal powder anti-blocking device according to claim 1, characterized in that: The air supply pipe (13) is provided with an air door and an adjustable shrinkage hole.

9. The coal powder anti-blocking device according to claim 8, characterized in that: It also includes a PLC controller and a measuring device, wherein the measuring device is arranged in the air-powder mixer (4) to measure the coal powder concentration and flow rate in the air-powder mixer (4), and the PLC controller adjusts the opening of the air door and the adjustable shrinkage hole according to the coal powder concentration and flow rate measured by the measuring device.

10. The coal powder anti-blocking device according to claim 1, characterized in that: It also includes a debris discharge pipe (15), which is arranged at the bottom of the crushing roller.

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