Spiral conveying device and coal gasification system

Abstract

The utility model discloses a spiral conveying device and a coal gasification system, and belongs to the technical field of coal gasification equipment. The spiral conveying device comprises a spiral conveyor and a storage hopper which are communicated with each other, wherein the storage hopper is communicated and connected with the spiral conveyor through a material buffering pipeline; two gate valves which are distributed up and down are arranged in the material buffering pipeline, a material storage space is formed between the two gate valves, and the two gate valves are opened alternately so as to control the amount of materials entering the spiral conveyor every time. By controlling the opening frequency of the upper gate valve and the lower gate valve, the quantity of materials entering the spiral conveyor can be controlled relatively accurately, so that the situation that the materials are stacked at the feed port of the spiral conveyor to wait for conveying is prevented, the materials can enter the spiral conveyor more uniformly and orderly, and the conveying efficiency is improved. Therefore, the blockage phenomenon can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal gasification equipment, and more specifically, relates to a screw conveyor device and a coal gasification system. Background Art

[0002] A screw conveyor is a common material conveying device that uses screw blades to push materials, and is mainly used for conveying powdery and particulate materials such as cement, fly ash, and mineral powder. One side of the feeding pipe is provided with a feed hopper, and the other side is provided with a discharge port. After the material enters the conveying pipe, it gradually moves under the push of the screw shaft until it is discharged from the discharge port.

[0003] It is found in actual use that materials often become blocked during the conveying process of the screw conveyor, which will cause the inside of the screw conveyor to be filled with materials, the screw blades to be overloaded, and in severe cases, the motor and screw blades to be damaged. Therefore, how to avoid the material accumulation phenomenon at the feed inlet of the screw conveyor to improve the risk of material blockage has important practical significance in production.

[0004] After retrieval, in the patent of CN205221860U, an anti-blocking screw feeder is disclosed. This application case includes a machine shell, a feed inlet and a discharge port. The feed inlet and the discharge port are arranged on the machine shell and are respectively located on the upper and lower sides at both ends of the axial direction of the machine shell. A screw drive shaft is arranged inside the machine shell, a screw blade is arranged on the screw drive shaft, a thrust blade is arranged at the discharge port end of the screw drive shaft, and a coupling, a speed reducer and a motor are connected to one end of the feed inlet of the machine shell. Among them, the pitch of the screw blade gradually increases from the feed inlet to the discharge port; a spreading air vent is arranged on the machine shell corresponding to one side of the discharge port. In this application case, the pitch of the screw shaft blade gradually becomes larger, the pitch of the blade at the feed inlet end remains unchanged, and the pitch of the blade increases towards the discharge end. On the premise of ensuring the original conveying capacity of the feeder remains unchanged, the conveying resistance of the equipment is reduced, and the occurrence of material blockage is effectively prevented.

[0005] In the patent of CN113353562A, a screw conveyor blockage clearing device is disclosed. In this application case, it includes a feeding pipe and a conveying component. An air-operated slide valve and an external air source are arranged on the feeding pipe, a blockage clearing component is arranged on the conveying component, an air inlet pipe is installed on one side of the blockage clearing component, and the air inlet pipe is connected to the air source. Valves are respectively arranged between the air source and the air-operated slide valve, and between the air source and the air inlet pipe; the blockage clearing component includes an installation pipe connected to the conveying component and an installation head with a filter screen. The installation head is connected to the installation pipe, and the filter screen is located inside the conveying component. When the screw conveying device is blocked, the air-operated slide valve and the conveying component are used in cooperation to timely and quickly clean the materials at the through hole. After blockage clearing, the materials are suspended in the shell, improving the safety and conveying efficiency of material conveying, and reducing the probability of the screw conveyor malfunctioning or being damaged due to blockage.

[0006] The above application solves the problem of material blockage in the screw conveyor from different perspectives, but does not solve the problem of material blockage at the source. This is because, in the design of many coal gasification systems, the coal bunker is directly connected to the feed inlet of the screw conveyor. A large amount of pulverized coal accumulates at the inlet of the screw conveyor waiting to be conveyed, resulting in excessive conveying pressure in the screw conveyor, which is prone to material blockage and even damage to the motor and screw blades. Utility Model Content

[0007] 1. Problems to be Solved

[0008] In view of at least some problems in the prior art, the present utility model provides a screw conveying device and a coal gasification system. By forming a storage space between two flap valves, the amount of material entering the screw conveyor can be controlled more precisely, effectively preventing material blockage.

[0009] 2. Technical Solutions

[0010] To solve the above problems, the technical solutions adopted by the present utility model are as follows:

[0011] A screw conveying device of the present utility model includes a screw conveyor and a storage hopper that are interconnected. The storage hopper and the screw conveyor are connected through a buffer pipe.

[0012] Two flap valves are arranged vertically in the buffer pipe. A storage space is formed between the two flap valves, and the two flap valves are alternately opened to control the amount of material entering the screw conveyor each time.

[0013] Further, the flap valve is inclined, and the inclination angle is 5 - 20°.

[0014] Further, the lower flap valve is arranged near the connection between the buffer pipe and the screw conveyor.

[0015] Further, the flap valve is made of high-temperature resistant material, and the side of the upper flap valve facing the storage hopper is made of wear-resistant material.

[0016] Further, a combing part is vertically arranged on the upper surface of the upper flap valve. The combing part is arranged near the end of the flap valve and is distributed in multiple numbers along the width direction of the flap valve.

[0017] Further, the combing part has an overall conical structure with a smaller upper part and a larger lower part, and the combing part is rotatably arranged on the flap valve.

[0018] Further, a chute for the slide valve to slide is provided on the inner wall of the slow-feed pipe, and the slide valve is connected to a driving source for driving it to slide back and forth along the chute.

[0019] Further, the overall slow-feed pipe is in a conical structure with a larger upper part and a smaller lower part, and both ends are detachably connected to the screw conveyor and the storage hopper through flanges.

[0020] The present utility model also provides a coal gasification system, which includes a gasifier and a pulverized coal conveying device; wherein, the pulverized coal conveying device is the above-mentioned screw conveying device, and the discharge port of the screw conveyor is connected to the feed port of the gasifier through a chute pipe.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] (1) In the screw conveying device of the present utility model, two slide valves are arranged up and down in the slow-feed pipe, a storage space is formed between the two slide valves, and the two slide valves are alternately opened; by controlling the opening frequency of the upper and lower slide valves, the amount of material entering the screw conveyor can be relatively accurately controlled to prevent the situation where materials accumulate at the feed port of the screw conveyor waiting for transportation, so that the materials can enter the screw conveyor more evenly and orderly, thereby effectively preventing the occurrence of blockage phenomena.

[0024] (2) In the screw conveying device of the present utility model, by the inclined setting of the slide valve, the frictional resistance between the slide valve and the material can be effectively reduced, making the plugging and unplugging actions of the slide valve more smooth; at the same time, due to the large pressure on the top surface of the upper slide valve, its loss is relatively serious, so this surface can be made of wear-resistant material, thereby ensuring the overall service life of the slide valve.

[0025] (3) In the screw conveying device of the present utility model, through the setting of the material combing part, the material combing part can perform synchronous reciprocating motion along with the slide valve. When the slide valve is opened, it can play a certain guiding effect on the materials above the slide valve, which is beneficial to ensuring the smoothness of material feeding. Description of the drawings

[0026] Figure 1 is a schematic structural diagram of a coal gasification system of the present utility model;

[0027] Figure 2 is a schematic distribution diagram of the slide valve in the slow-feed pipe of the present utility model.

[0028] In the figure: 1, screw conveyor; 2, storage hopper; 3, slow-feed pipe; 4, slide valve; 5, material combing part; 6, chute pipe; 7, gasifier. Detailed implementation manners

[0029] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present 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. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] The present utility model will be further described below with specific embodiments.

[0032] As Figure 1 、 Figure 2 shown, a screw conveyor device in this embodiment includes a screw conveyor 1 and a storage hopper 2. Among them, the screw conveyor 1 and the storage hopper 2 are connected and communicated through a slow-feed pipeline 3. At the same time, two flap valves 4 are arranged up and down in the slow-feed pipeline 3. A certain amount of storage space is formed between the two flap valves 4, and the opening and closing actions of the two flap valves 4 are carried out in sequence to control the amount of material entering the screw conveyor 1 each time.

[0033] Specifically, the slow-feed pipeline 3 is of a conical structure with a large upper part and a small lower part. Both ends of the slow-feed pipeline 3 are detachably connected to the screw conveyor 1 and the storage hopper 2 respectively through their respective flanges, so as to facilitate the assembly operation of the whole conveying, as well as the later maintenance and repair operations. At the same time, a sealing ring is provided at the corresponding flange connection to ensure the sealing performance inside the whole flow pipeline.

[0034] The flap valve 4 can be made of high-temperature resistant material, and the flap valve 4 is connected with a driving source for its opening and closing action. Preferably, the driving source can be directly arranged on the outer peripheral wall of the slow-feed pipeline 3, and it can be a cylinder, an oil cylinder, an electric push rod or others. At the same time, a sliding groove for the flap valve 4 to slide back and forth is opened on the inner wall of the slow-feed pipeline 3 to ensure the stability of the flap valve 4 moving back and forth.

[0035] In addition, the lower flap valve 4 is arranged near the connection between the slow-feed pipeline 3 and the screw conveyor 1 to reduce the accumulation space of the material between the flap valve 4 and the feed inlet of the screw conveyor 1. When the lower flap valve 4 is opened, the material in the storage space can directly enter the screw conveyor 1, preventing the smoothness of the feeding from being affected due to too large an accumulation space.

[0036] Due to the relatively large pressure from the material on the top surface of the upper flap valve 4, its loss is relatively serious during the movement. Therefore, wear-resistant materials can be used for this surface, so as to ensure the overall service life of the flap valve 4.

[0037] For a screw conveyor device according to this embodiment, its working process and principle are as follows: Materials flow from the storage hopper 2 into the buffer pipeline 3. At this time, the upper flap valve 4 is in the open state, and the lower flap valve 4 is in the closed state. Then, the upper flap valve 4 is closed to prevent feeding, so that the storage space between the two flap valves 4 is filled with materials. Subsequently, the lower flap valve 4 is opened, and the materials in the storage space enter the screw conveyor 1, completing one feeding operation. Repeating the above actions can complete continuous feeding operations. At the same time, by controlling the opening and closing frequencies of the upper and lower flap valves, the feeding speed of the materials can be controlled.

[0038] In this embodiment, one end of the flap valve 4 is located inside the buffer pipeline 3, and the other end is located outside the buffer pipeline 3. For the convenience of subsequent description, the end of the flap valve 4 located outside the buffer pipeline 3, that is, the end connected to the drive source, is denoted as the connection end; while the end located inside the buffer pipeline 3 is denoted as the free end.

[0039] As Figure 2 shown, as a preferred embodiment of the flap valve 4, the flap valve 4 is integrally inclined downward horizontally, that is, the free end of the flap valve 4 is lower than the connection end. Through the inclined setting of the flap valve 4, on the one hand, the resistance of the flap valve 4 during movement can be reduced; on the other hand, the materials accumulated above the flap valve 4 can be distributed obliquely, which is also beneficial to the discharging operation of this part of the materials. Preferably, the inclination angle of the flap valve 4 is 5° - 20°, for example, 5°, 10°, 15°, 20°, etc.

[0040] Furthermore, a material combing part 5 is provided on the upper surface of the upper flap valve 4 for guiding the materials accumulated above the flap valve 4 to accelerate the discharging of the materials and prevent blockage.

[0041] Specifically, the material combing part 5 has an overall conical structure with a smaller upper part and a larger lower part, and the material combing part 5 is vertically arranged near the free end of the flap valve 4 to minimize the interference between the material combing part 5 and the inner wall of the buffer pipeline 3 when the flap valve 4 is opened. At the same time, to further improve the material guiding effect, multiple material combing parts 5 can be distributed along the width direction of the flap valve 4.

[0042] It should be noted that the above-mentioned "vertical setting" does not specifically refer to a strict 90-degree setting. As long as the pointed head part of the material combing part 5 is inclined upward as a whole and can play a role in guiding the materials, it is okay. At the same time, the direction in which the flap valve 4 moves back and forth is called the length direction, and the direction perpendicular to the moving direction is called the width direction.

[0043] Due to the presence of the material combing part 5, the frictional resistance during the movement of the flap valve 4 will increase. Therefore, in this embodiment, the material combing part 5 is rotatably arranged on the flap valve 4, such as by bearing connection, etc., so that the material combing part 5 can rotate during the movement along with the flap valve 4 to reduce the frictional resistance; at the same time, the rotation of the material combing part 5 is also beneficial to improving the material combing effect.

[0044] In this embodiment, through the arrangement of the material combing part 5, the material combing part 5 can perform synchronous reciprocating motion along with the flap valve 4. When the flap valve 4 is opened, it can play a certain guiding effect on the materials above the flap valve 4, which is beneficial to ensuring the smoothness of the material feeding.

[0045] In addition, this embodiment also provides a coal gasification system, which includes a gasifier 7 and the above-mentioned screw conveyor device. Among them, a chute pipe 6 is provided at the discharge port of the screw conveyor 1, and is hermetically connected to the feed port of the gasifier 7 through the chute pipe 6.

[0046] In a coal gasification system of this embodiment, by adding a pneumatic double-layer flap valve 4 between the outlet of the slow-feeding pipeline 3 and the inlet of the screw conveyor 1, and the opening frequency of the upper and lower flap valves 4 can be adjusted according to the on-site situation. Before the pulverized coal (pulverized coal) in the slow-feeding pipeline 3 flows into the screw conveyor 1, it needs to first enter the storage space formed by the two flap valves 4, and then enter the gasifier 7 through the screw conveyor 1. Since the volume of the above-mentioned storage space is certain, the amount of materials entering the screw conveyor 1 each time can also be approximately regarded as a fixed quantity. Combined with the opening frequency of the flap valve 4, the feeding rate can be controlled to ensure that there will be no situation where a large amount of materials accumulate at the inlet of the screw conveyor 1 waiting to be transported, so that the materials can enter the screw conveyor 1 more evenly and orderly, thereby effectively preventing the occurrence of blockage phenomena. At the same time, since the two flap valves 4 are opened alternately, the sealing effect in the storage hopper 2 can be effectively guaranteed, and the material leakage phenomenon caused by uneven pressure can be prevented.

[0047] The above schematically describes the present invention and its implementation manners. This description is not restrictive, and what is shown in the drawings is only one of the implementation manners of the present invention. The actual structure is not limited to this. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A screw conveying device, comprising a screw conveyor (1) and a material storage hopper (2) connected to each other, characterized in that: The material storage hopper (2) and the screw conveyor (1) are connected via a material buffering pipeline (3); The slow material pipeline (3) is provided with two plug valves (4) distributed up and down, a material storage space is formed between the two plug valves (4), and the two plug valves (4) are opened alternately to control the amount of material entering the screw conveyor (1) each time.

2. A screw conveying device according to claim 1, characterized in that: The gate valve (4) is arranged in an inclined manner, and its inclination angle is 5-20 degrees.

3. A screw conveying device according to claim 2, characterized in that: The gate valve (4) located at the bottom is arranged near the connection between the slow material pipeline (3) and the screw conveyor (1).

4. A screw conveying device according to any one of claims 1 to 3, characterized in that: The gate valve (4) is made of high temperature resistant material, and the side of the gate valve (4) located at the top facing the storage hopper (2) is made of wear-resistant material.

5. A screw conveying device according to claim 1, characterized in that: A vertically arranged combing portion (5) is provided on the upper surface of the upper layer of the plug valve (4). The combing portion (5) is arranged close to the end of the plug valve (4), and a plurality of the combing portions (5) are distributed along the width direction of the plug valve (4).

6. A screw conveying device according to claim 5, characterized in that: The combing part (5) is in the shape of a cone with a small upper part and a large lower part as a whole, and the combing part (5) is rotatably arranged on the plug valve (4).

7. A screw conveying device according to claim 5, characterized in that: The inner wall of the buffer pipe (3) is provided with a slide groove for the slide plate valve (4) to slide, and the slide plate valve (4) is connected to a driving source for driving it to slide back and forth along the slide groove.

8. A screw conveying device according to claim 4, characterized in that: The slow material pipeline (3) is generally in a conical structure with a larger upper portion and a smaller lower portion, and both ends are detachably connected to the screw conveyor (1) and the material storage hopper (2) via flanges.

9. A coal gasification system, comprising a gasifier (7) and coal powder conveying equipment, characterized in that: The pulverized coal conveying equipment is a screw conveying device as described in any one of claims 1 to 8, and the discharge port of the screw conveyor (1) is connected to the feed port of the gasifier (7) through a chute (6).

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