Pneumatic slag conveying system

Abstract

The utility model provides a slag pneumatic conveying system. The slag pneumatic conveying system comprises an air supply assembly, a slag warehouse ash hopper, a composite crusher, a spiral feeder, a bin pump and a feeding buffer box, a discharging opening of the slag warehouse ash hopper is communicated with a feeding opening of the composite crusher through a pipeline, and a discharging opening of the composite crusher is communicated with a feeding opening of the spiral feeder through a material pipeline; a discharging port of the spiral feeder is communicated with a feeding port of the bin pump, a discharging port of the bin pump is communicated with a feeding port of the feeding buffer box through a pipeline, and a discharging port of the feeding buffer box is communicated to a boiler through a feeding pipe. According to the slag pneumatic conveying system, materials are completely closed in the whole conveying process, the influence of weather, environment and site is small, the working condition of workers is good, the materials cannot be affected with damp, stained or mixed with impurities, equipment is simple, the structure is compact, centralized control is easy, automation can be achieved, the conveying capacity is improved, and the material granularity is uniform; and therefore, the practicability is higher.

Description

Technical Field

[0001] The utility model relates to the field of slag transportation, in particular to a slag pneumatic transportation system. Background Art

[0002] Solid particles with a certain thickness and meeting certain particle size distribution requirements are laid on the air distribution plate before the circulating fluidized bed boiler is started. The bed material is generally sieved bottom ash or sand.

[0003] In the prior art, when loading the boiler, the coal is transported through a coal conveying system to the main plant silo.

[0004] There are the following disadvantages:

[0005] 1. During the transportation process, the slag is directly exposed to the environment, the dust is large, the visibility is extremely low, there are major safety hazards, and it has a great impact on the equipment. The on-site hygiene is uncontrollable, affecting civilized production;

[0006] 2. The slag must be screened before being put on the bed through the conveyor belt, which places high demands on the coal yard. If the bed material cannot be screened in time during the coal feeding, the large particles that have not been screened will be used as bed material, which will affect fluidization and prolong the cold ignition time;

[0007] 3. After the bed material bin is filled up at one time, it is stored for a long time, and the slag in the bin is easily affected by moisture and agglomerates.

[0008] Therefore, it is necessary to provide a slag pneumatic conveying system to solve the above technical problems. Utility Model Content

[0009] The utility model provides a slag pneumatic conveying system, which solves the problems of using a conveyor belt to transport slag, the slag being directly exposed to the environment, polluting the working environment, affecting the normal operation of equipment, and the slag being easily affected by moisture.

[0010] In order to solve the above technical problems, the utility model provides a slag pneumatic conveying system, including an air supply component, a slag storage hopper, a compound crusher, a screw feeder, a silo pump and a feed buffer box, the feed port of the slag storage hopper is connected with the feed port of the compound crusher through a first feed pipeline, the discharge port of the compound crusher is connected with the feed port of the screw feeder through a second feed pipeline, the discharge port of the screw feeder is connected with a third feed pipeline, the other end of the third feed pipeline is connected with the feed port of the silo pump, the discharge port of the silo pump is connected with the feed port of the feed buffer box through a fourth feed pipeline, and the discharge port of the feed buffer box is connected to the boiler through a feed pipe;

[0011] The first material conveying pipeline is provided with a pneumatic slag discharge valve for controlling its opening and closing, the third material conveying pipeline is provided with a pneumatic feed valve, the front end of the fourth material conveying pipeline is connected with an air delivery pipe, and the fourth material conveying pipeline is provided with a pneumatic discharge valve behind the position connected with the feed port of the silo pump;

[0012] The air supply assembly supplies air to the pneumatic slag discharge valve, the pneumatic feed valve, the air pipe and the pneumatic discharge valve.

[0013] Preferably, a manual inspection valve is provided on the first material conveying pipeline in front of the pneumatic slag unloading valve.

[0014] Preferably, a first pipeline compensator is provided on the second material conveying pipeline.

[0015] Preferably, a plurality of pipeline air supply rings are arranged at intervals on the fourth material conveying pipeline, and the air supply component supplies air to the fourth material conveying pipeline through the pipeline air supply rings.

[0016] Preferably, a control valve is provided on one end of the fourth material delivery pipeline close to the material feed buffer box and on one end of the material feed pipe close to the material feed buffer box, respectively, and a second pipeline compensator is provided on the material feed pipe behind the control valve.

[0017] Preferably, a pneumatic pressurizing valve group is provided on the gas delivery pipe.

[0018] Preferably, the gas supply assembly includes a gas storage tank and a control box, and a plurality of gas supply control valve groups are arranged in the control box. The gas storage tank supplies gas to the control box and the plurality of gas supply control valve groups control the gas supply of each gas path respectively.

[0019] Compared with the related art, the slag pneumatic conveying system provided by the utility model has the following beneficial effects:

[0020] The utility model provides a slag pneumatic conveying system. The material is completely enclosed in the whole conveying process, is less affected by the climate, environment and site, and provides good working conditions for workers. The material will not be affected by moisture, stain or mixed with impurities. The equipment is simple, the structure is compact, and it is easy to centrally control. Automation can be realized, the conveying capacity is improved, the material particle size is uniform, and it can be used at any time, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic structural diagram of a preferred embodiment of the slag pneumatic conveying system provided by the utility model.

[0022] Numbers in the figure: 1. ash hopper of slag storage, 2. compound crusher, 3. screw feeder, 4. silo pump, 5. feed buffer box, 6. first feed pipeline, 7. second feed pipeline, 8. third feed pipeline, 9. fourth feed pipeline, 10. feed pipe, 11. boiler, 12. gas storage tank, 13. control box, 14. pneumatic slag unloading valve, 15. pneumatic feed valve, 16. gas pipe, 17. pneumatic discharge valve, 18. manual inspection valve, 19. a pipeline compensator, 20. pipeline air supply ring, 21. second pipeline compensator, 22. pneumatic pressurizing valve group. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0024] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a preferred embodiment of the slag pneumatic conveying system provided by the utility model. The slag pneumatic conveying system includes an air supply component, a slag storage hopper 1, a compound crusher 2, a screw feeder 3, a silo pump 4 and a feed buffer box 5. The feed port of the slag storage hopper 1 is connected to the feed port of the compound crusher 2 through a first feed pipeline 6, the discharge port of the compound crusher 2 is connected to the feed port of the screw feeder 3 through a second feed pipeline 7, the discharge port of the screw feeder 3 is connected to a third feed pipeline 8, the other end of the third feed pipeline 8 is connected to the feed port of the silo pump 4, the discharge port of the silo pump 4 is connected to the feed port of the feed buffer box 5 through a fourth feed pipeline 9, and the discharge port of the feed buffer box 5 is connected to the boiler 11 through a feed pipe 10.

[0025] The slag in the ash hopper 1 of the slag storage enters the compound crusher 2 through the first feeding pipeline 6, and after being crushed, enters the screw feeder 3 through the second feeding pipeline 7, is continuously transported backward by the screw feeder 3, and is transported to the silo pump 4 through the third feeding pipeline 8, enters the fourth feeding pipeline 8 from the discharge port of the silo pump 4, enters the feed buffer box 5 along the fourth feeding pipeline 8 for buffering, and then enters the boiler 11 through the feed pipe 10.

[0026] Each conveying pipeline is a DN80 pipe with a wall thickness of not less than 12mm and is made of 16Mn steel.

[0027] The compound crusher 2 has a large crushing ratio and high crushing moisture content. It has an ideal processing effect on materials with high moisture content. The discharging particle size can be adjusted arbitrarily. There is no screen bar setting. Materials with large mud content will not be blocked. Uncrushable materials that enter the machine body can be automatically discharged without causing damage to the equipment. The equipment crushes materials in a direct flow, has high production efficiency, unique structure, stable operation, low noise, and easy maintenance. The wearing parts can be easily replaced by opening the working compartment door.

[0028] The first feed pipeline 6 is provided with a pneumatic slag unloading valve 14 for controlling its opening and closing, the third feed pipeline 8 is provided with a pneumatic feed valve 15, the front end of the fourth feed pipeline 9 is connected to an air pipe 16, and the fourth feed pipeline 9 is provided with a pneumatic discharge valve 17 at the rear of the position connected to the feed port of the silo pump 4.

[0029] The air supply assembly supplies air to the pneumatic slag discharge valve 14 , the pneumatic feed valve 15 , the air delivery pipe 16 and the pneumatic discharge valve 17 .

[0030] The pneumatic feed valve 15 is arranged at the feed port of the silo pump and is used to open or close the feed port. The rotary feed valve drives the valve plate to move through the rotating shaft, so that the movement force when the valve is switched is a rotary motion. The piston rod and sealing packing of the pneumatic actuator should not be in direct contact with the medium. Material leakage at the shaft seal should be avoided. The valve body is made of precision steel castings, the sealing packing is made of wear-resistant and high-temperature resistant fluororubber seals, and the sealing surface between the valve plate and the valve seat is made of wear-resistant carbide material or wear-resistant toughened structural ceramics, with a smooth surface and a hardness of 60 to 70HRC.

[0031] The pneumatic discharge valve 17 is arranged on the silo pump delivery pipeline to open or close the delivery pipeline. The impact surface of the main sealing component is made of hard alloy, which has impact resistance and wear resistance.

[0032] The gas supply assembly includes a gas storage tank 12 and a control box 13. The control box 13 is provided with a plurality of gas supply control valve groups. The gas storage tank 12 supplies gas to the control box 13 and the plurality of gas supply control valve groups control the gas supply of each gas path.

[0033] Each pneumatic valve is connected to an air supply control valve group through a pipeline, and the action is independently controlled by each air supply control valve group.

[0034] The air outlet of the air storage tank 12 is connected to an air outlet pipe, and the air outlet pipe is connected to a branch pipe connected to the air inlet of the control box 13, and then the air source is transported to each air supply control valve group and output through each pipeline.

[0035] The gas outlet pipe is provided with a gas source pressure transmitter to monitor the gas source pressure in real time. The gas storage tank 12 is provided with a safety pressure relief valve and a manual exhaust valve to relieve pressure and empty the tank body when the pressure is too high.

[0036] When the screw conveyor 3 supplies material to the silo pump 4 , the pneumatic feed valve 15 is opened, the pneumatic discharge valve 17 is closed, and at the same time the gas supply pipe 16 stops supplying gas, and the slag falls into the silo pump 4 through the third feed pipeline 8 .

[0037] During discharge, the pneumatic feed valve 15 is closed and the pneumatic discharge valve 17 is opened, and the slag falls into the fourth conveying pipeline 9. At the same time, the gas pipe 16 continues to supply high-pressure gas. Under the action of the airflow, the slag entering the fourth conveying pipeline 9 is pushed along the fourth conveying pipeline 9 into the feed buffer box 5. After buffering in the feed buffer box 5, it enters the boiler 11 through the feed pipe 10 to realize feeding.

[0038] The front end of the air pipe 16 is connected to the air outlet pipe of the air storage tank 12, and the front end of the fourth material delivery pipeline 9 is connected to the air pipe 16. The connection between it and the silo pump 4 is located behind the connection between it and the air pipe 16, so that the incoming airflow can push the slag to move from front to back.

[0039] The gas delivery pipe 16 is provided with a pneumatic pressure valve group 22, which can control the opening and closing of the gas delivery pipe 16 and adjust the air flow pressure.

[0040] The silo pump 4 can be equipped with a PLC control box, which can be controlled remotely / locally.

[0041] A material level meter is provided on the silo pump 4. At the same time, a branch pipe is connected to the air pipe 16, which enters the silo pump 4 from the top and pushes the material out downward. Therefore, a pressure transmitter is also provided on the silo pump 4 to detect the pressure inside the silo pump 4.

[0042] A manual inspection valve 18 is provided on the first material conveying pipeline 6 in front of the pneumatic slag discharge valve 14 for inspecting the pipeline.

[0043] The second material conveying pipeline 7 is provided with a first pipeline compensator 19 .

[0044] Control valves are respectively provided on one end of the fourth feed pipeline 7 close to the feed buffer box 5 and on one end of the feed pipe 10 close to the feed buffer box 5 , and a second pipeline compensator 21 is provided on the feed pipe 10 behind the control valve.

[0045] The first pipeline compensator 19 and the second pipeline compensator 21 are both bellows compensators, which are used to compensate for pipeline deformation.

[0046] A plurality of pipeline air supply rings 20 are arranged at intervals on the fourth material conveying pipeline 9 , and the air supply component supplies air to the fourth material conveying pipeline 9 through the pipeline air supply rings 20 .

[0047] The air outlet pipe of the air storage tank 12 is connected to two air supply manifolds, one of which is connected to the middle section of the fourth feed pipeline 9, and is located between the connection between the fourth feed pipeline 9 and the discharge port of the silo pump 4 and the frontmost pipeline air supply ring 20, for the first stage of air supply, and the second air supply manifold is connected to multiple pipeline air supply rings 20 for subsequent multiple stages of air supply, so that the internal air pressure of the fourth feed pipeline 9 always maintains a level capable of pushing the slag to move.

[0048] The first air supply manifold is provided with a pneumatic air-assisting valve group, the second air supply manifold is provided with a pneumatic air supply valve group, and the second air supply manifold is connected to the pipeline air supply pipe 20 through a control valve.

[0049] Compared with the related art, the slag pneumatic conveying system provided by the utility model has the following beneficial effects:

[0050] The materials are completely enclosed during the entire transportation process and are less affected by the climate, environment and site. The workers have good working conditions and the materials will not be affected by moisture, contamination or mixed with impurities. The equipment is simple, compact, easy to centrally control, and can be automated to improve the transportation capacity. The material particle size is uniform, so it can be used as needed and is more practical.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A slag pneumatic conveying system, characterized in that: It comprises an air supply component, a slag hopper (1), a composite crusher (2), a screw feeder (3), a silo pump (4) and a feed buffer box (5); the feed outlet of the slag hopper (1) is connected to the feed outlet of the composite crusher (2) through a first feed pipeline (6); the feed outlet of the composite crusher (2) is connected to the feed outlet of the screw feeder (3) through a second feed pipeline (7); the feed outlet of the screw feeder (3) is connected to a third feed pipeline (8); the other end of the third feed pipeline (8) is connected to the feed outlet of the silo pump (4); the feed outlet of the silo pump (4) is connected to the feed outlet of the feed buffer box (5) through a fourth feed pipeline (9); the feed outlet of the feed buffer box (5) is connected to a boiler (11) through a feed pipe (10); The first material conveying pipeline (6) is provided with a pneumatic slag discharge valve (14) for controlling its opening and closing, the third material conveying pipeline (8) is provided with a pneumatic feed valve (15), the front end of the fourth material conveying pipeline (9) is connected to an air delivery pipe (16), and the fourth material conveying pipeline (9) is provided with a pneumatic discharge valve (17) at the rear of the position connected to the feed port of the silo pump (4); The air supply assembly supplies air to the pneumatic slag discharge valve (14), the pneumatic feed valve (15), the air delivery pipe (16) and the pneumatic discharge valve (17).

2. The slag pneumatic conveying system according to claim 1, characterized in that: A manual inspection valve (18) is provided on the first material conveying pipeline (6) in front of the pneumatic slag discharge valve (14).

3. The slag pneumatic conveying system according to claim 1, characterized in that: The second material conveying pipeline (7) is provided with a first pipeline compensator (19).

4. The slag pneumatic conveying system according to claim 1, characterized in that: A plurality of pipeline air supply rings (20) are arranged at intervals on the fourth material conveying pipeline (9), and the air supply component supplies air to the fourth material conveying pipeline (9) through the pipeline air supply rings (20).

5. The slag pneumatic conveying system according to claim 1, characterized in that: A control valve is provided on one end of the fourth material delivery pipeline (9) close to the material feed buffer box (5) and on one end of the material feed pipe (10) close to the material feed buffer box (5), respectively, and a second pipeline compensator (21) is provided on the material feed pipe (10) behind the control valve.

6. The slag pneumatic conveying system according to claim 1, characterized in that: The gas delivery pipe (16) is provided with a pneumatic pressure valve group (22).

7. The slag pneumatic conveying system according to claim 1, characterized in that: The gas supply assembly comprises a gas storage tank (12) and a control box (13). The control box (13) is provided with a plurality of gas supply control valve groups. The gas storage tank (12) supplies gas to the control box (13) and the plurality of gas supply control valve groups control the gas supply of each gas path.

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