CN116534591A - Powder Pneumatic Conveying Pump - Google Patents

Abstract

The invention relates to the technical field of pneumatic conveying equipment, and discloses a powder pneumatic conveying pump, which includes a powder feeding device, a pneumatic conveying device and a gas-solid mixing part, and the outlet of the powder feeding device is connected to the pneumatic conveying device The outlets of the outlets meet at the gas-solid mixing part, and the powder feeding device includes a feeding pipe with a tapered section and a conveying part arranged in the feeding pipe, and the conveying part can push the material to the gas-solid mixing part. In the mixing section, the inner diameter of the tapered section is set to gradually decrease along the material conveying direction, and the inner diameter of the portion of the feeding pipe outside the tapered section remains constant along the material conveying direction. In the above technical solution, guided by the structure of the tapered section, the material in the feeding pipe is accumulated at the outlet of the powder feeding device, so that the material can fill the outlet of the powder feeding device before being output, so it can prevent The reverse steam flow enters the powder feeding device.

Description

Powder Pneumatic Conveying Pump

technical field

The invention relates to the technical field of pneumatic conveying equipment, in particular to a powder pneumatic conveying pump.

Background technique

Coal gasification uses coal as raw material. In specific equipment (such as a gasifier), a series of chemical reactions occur between the organic matter in the coal and the gasification agent under high temperature and pressure, so that the solid coal is converted into a combustible Gas production process. In small and medium-sized coal gasification technology, the pulverized coal from the pulverized coal bunker is usually mixed with steam and injected into the gasification furnace through the central pipe of the gasifier nozzle to participate in the gasification reaction.

Before the pulverized coal enters the gas-solid mixing pipeline process, the following adverse phenomena are prone to occur: (1) The reverse steam flow often enters the pulverized coal bunker, and the formed condensed water mixes with the pulverized coal to cause agglomeration, which in turn affects the pulverized coal. The coal is normally and smoothly unloaded. (2) Pulverized coal feeding control components, such as star valves, do not have strict sealing performance, so they are easily disturbed by reverse steam flow, making it difficult to accurately control and measure the pulverized coal feeding volume. (3) Before the pulverized coal enters the gas-solid contact mixing area, it also needs to pass through the weighing screw device and the sealing screw device, and its running path is long. Since the above two original equipments do not have thermal insulation and heat tracing functions, and it is difficult to set up thermal insulation and heat tracing functions in the later stage, the effect is poor, resulting in poor local heat tracing of the equipment, which in turn leads to the fact that hot pulverized coal is easy to cool during operation. It is not conducive to the transportation of pulverized coal in normal state.

Contents of the invention

The object of the present invention is to provide a powder pneumatic conveying pump in order to overcome the problem in the prior art that the reverse steam enters the pulverized coal bunker.

In order to achieve the above object, the present invention provides a powder pneumatic conveying pump, comprising a powder feeding device, a pneumatic conveying device and a gas-solid mixing part, the outlet of the powder feeding device meets the outlet of the pneumatic conveying device In the gas-solid mixing part, the powder feeding device includes a feeding pipe with a tapered section and a conveying part arranged in the feeding pipe, and the conveying part can push the material to the gas-solid mixing part, The inner diameter of the tapered section is set to gradually decrease along the material conveying direction, and the inner diameter of the part of the feeding pipe outside the tapered section remains constant along the material conveying direction.

Optionally, the conveying component includes a main shaft arranged along the central axis of the feeding tube and helical blades arranged around the main shaft.

Optionally, the outer edge of the helical blade is in sealing engagement with the inner wall of the tapered section, and the helical blade is an equidistant helical blade.

Optionally, the conveying part further includes a driving assembly capable of driving the main shaft to rotate.

Optionally, the powder feeding device further includes an end cover rotatably hinged at the outlet of the feeding tube, and the end cover can be opened under the push of the material.

Optionally, the pneumatic conveying device includes an air delivery pipe, and the air delivery pipe covers the outside of the feeding pipe and is provided with a gas flow channel between the feeding pipe.

Optionally, swirl blades extending along a helical line around the central axis are arranged in the gas channel.

Optionally, edges on both sides of the swirl blade are respectively connected to the outer wall of the feeding pipe and the inner wall of the air delivery pipe.

Optionally, the air inlet pipe is arranged at an end away from the outlet of the pneumatic conveying device.

Optionally, the powder pneumatic conveying pump further includes a feed pipe, the feed pipe is arranged vertically, and the bottom end of the feed pipe communicates with the feed inlet.

Through the above-mentioned technical solution, in the above-mentioned technical solution, the powdery material (usually pulverized coal) in the feeding tube can be transported in the outlet area of the powder feeding device by using the feeding pipe with a tapered section under the push of the conveying parts. A certain degree of accumulation occurs, so that the material can fully fill the outlet of the powder feeding device, until it enters the gas-solid mixing part and then mixes with the gas, so that the gas cannot penetrate through the outlet of the powder feeding device , so it can prevent the reverse steam flow from entering the powder feeding device, thereby preventing the condensed water formed by the steam from mixing with the pulverized coal to cause agglomeration.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a powder pneumatic conveying pump according to the present invention;

Fig. 2 is a schematic structural view of an embodiment of the conveying part of the present invention;

Fig. 3 is a schematic structural view of an embodiment of the end cap of the present invention;

Fig. 4 is a schematic structural view of an embodiment of the feeding pipe of the present invention;

Fig. 5 is a schematic structural view of an embodiment of the gas delivery device of the present invention.

Explanation of reference signs

10-powder feeding device, 11-conveyor assembly, 111-motor, 112-reducer, 113-coupling, 114-main shaft, 115-first helical blade, 116-helical blade, 117-bearing, 12- Feeding pipe end cover, 121-feeding pipe, 122-first straight barrel section, 123-first flange, 13-feeding pipe, 131-converging section, 132-second flange, 133-end cover, 134 - swirl vane, 20 - pneumatic conveying device, 21 - gas delivery pipe, 22 - intake pipe, 23 - third flange, 30 - gas-solid mixing part, 40 - support frame.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, unless stated to the contrary, the used orientation words such as "upper", "lower", "top" and "bottom" usually refer to the orientation of the device or equipment when it is in use. It should be noted that this is only for the convenience of describing the present invention, and should not be construed as a limitation of the present invention.

In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

In the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

The present invention provides a powder pneumatic conveying pump, comprising a powder feeding device 10, a pneumatic conveying device 20 and a gas-solid mixing unit 30, the outlet of the powder feeding device 10 and the outlet of the pneumatic conveying device 20 intersect In the gas-solid mixing part 30, the powder feeding device 10 includes a feeding pipe 13 with a tapered section 131 and a conveying part 11 arranged in the feeding pipe 13, and the conveying part 11 can push the material To the gas-solid mixing part 30, the inner diameter of the tapered section 131 is set to gradually become smaller along the material conveying direction, and the inner diameter of the part of the feeding pipe 13 outside the tapered section 131 is set to be different along the material conveying direction. Change.

It should be noted that the above-mentioned device can be used for mixing powdery materials and gas. In the process of coal gasification production, pulverized coal is usually used as raw material, mixed with steam and transported into the gasification furnace for gasification reaction. , the mixing process usually uses steam with a certain flow rate to mix with pulverized coal through the airflow effect, and the mixing can be completed by transporting the pulverized coal into the airflow environment. For the convenience of understanding, the coal gasification production will be taken as an example for description below, but it should not be regarded as a limitation to the implementation of the present application. The tapering section 131 can be used as a part of the feeding pipe 13 and then be arranged on any part of the feeding pipe 13, but in order to ensure that the output pulverized coal can fully fill the outlet of the feeding pipe 13, the feeding pipe 13 should The inner diameter of the portion other than the shrinkage section 131 is constant along the material conveying direction. For the convenience of setting, the tapered section 131 can be arranged at the outlet section of the feeding pipe 13, so the outlet of the tapered section 131 is the outlet of the feeding pipe 13, and the outlet of the feeding pipe 13 can also be used as the outlet of the powder feeding device 10 .

In the above technical solution, the feed pipe 13 with the tapered section 131 is used, and under the push of the conveying part 11, the powdery material (usually pulverized coal) in the feed pipe 13 can be placed in the outlet area of the powder feeding device 10. A certain degree of accumulation occurs, so that the material can fully fill the outlet of the powder feeding device 10 until it enters the gas-solid mixing part 30 and then mixes with the gas, so that the gas cannot pass through the powder feeding device 10 Therefore, it can prevent the reverse steam flow from entering the powder feeding device 10, thereby preventing the condensed water formed by the steam from mixing with the pulverized coal to cause agglomeration. In order to achieve a better implementation effect, it can be set as follows: the material flow rate input into the feeding pipe 13 is slightly greater than or equal to the maximum output flow rate of the powder feeding device 10, that is, the maximum flow rate that the outlet of the tapered section 131 can withstand. In this way, the amount of powder conveyed can be measured by measuring the conveying speed of the conveying member 11 and the outlet diameter of the tapered section 131 .

The conveying part 11 can be a structure such as a piston-type push structure, which only needs to push the material from the feed inlet to the outlet of the feed pipe 13, but the material push process of the piston-type structure is intermittent and cannot be continuous and uniform. continue to operate. As a specific embodiment, as shown in FIG. 1 and FIG. 2 , the conveying part 11 includes a main shaft 114 arranged along the central axis of the feeding pipe 13 and a helical blade 116 arranged around the main shaft 114 . Through the rotation of the helical blade, a uniform and continuous pushing force can be applied to the pulverized coal, and then the pulverized coal can be continuously fed into the feeding pipe 13 , and the conveying member 11 can continuously send the pulverized coal to the gas-solid mixing part 30 .

In order to ensure that the material can receive the driving force transmitted by the conveying part 11, as shown in Figure 2, the outer edge of the helical blade 116 is in sealing engagement with the inner wall of the tapered section 131, and the helical blade 116 is an equidistant helical blade . The outer edge of the helical blade 116 is in sealing engagement with the inner wall of the tapered section 131 so that each part of the material in the feeding pipe 13 can receive a pushing force, and the material cannot fully fill the tapered section 131 due to insufficient pushing force. of the exit. Since the outer edge of the helical blade 116 is sealingly engaged with the inner wall of the tapered section 131, a plurality of relatively closed and relatively isolated passages are formed between the inner wall of the tapered section 131 and the helical blade, and the equidistant helical blades 116 The diameter of the above-mentioned channel can be kept consistent and continuously pressed forward to ensure that no cavity will be generated. However, the helical blades 116 with gradually smaller pitches will lose more power.

More specifically, as shown in FIG. 2 , the conveying component 11 further includes a driving assembly capable of driving the main shaft 114 to rotate. The driving assembly may include a motor 111 and a reducer 112 connected to the motor 111 , the main shaft 114 and the output shaft of the reducer 112 may be connected through a coupling 113 , and the driving of the motor 111 drives the rotation of the main shaft 114 .

As a specific embodiment, the feed pipe 13 can be shown in Figure 1, Figure 3 and Figure 4, and also includes a feed pipe end cover 12, and the feed pipe end cover 12 is connected with the tapered section 131 to form a joint The feeding pipe 13, the feeding pipe end cover 12 and the feeding pipe 13 can be connected through the first flange 123 and the second flange 132 to ensure the sealing of the connection. The feeding pipe end cover 12 and the tapered section 131 A first straight cylinder section 122 can also be provided as a connection between them. The feed pipe end cover 12 is also a cylindrical structure, and a first helical blade 115 can be provided correspondingly inside it. blade. The materials entering this area can be fully stirred under the action of the first helical blade 115 and give the materials an initial driving force. A bearing 117 may be provided at the connecting part between the main shaft 114 and the end cover 12 of the feed pipe, and the bearing 117 may be a dust-proof support bearing, so that it can work for a long time in a dusty environment and reduce the need for maintenance operations. Furthermore, more bearings 117 can be arranged on the axis of the feeding pipe 13 through a support rod, one end of the supporting rod is connected to the bearing 117 , and the other end is fixedly connected to the inner wall of the feeding pipe 13 .

When the amount of pulverized coal sent to the feed pipe 13 is less than the flow rate at the outlet of the tapered section 131, the powder cannot fully fill the outlet of the feed pipe 13. To solve this problem, as shown in Figure 4 As shown, the powder feeding device 10 also includes an end cover 133 rotatably hinged at the outlet of the feeding pipe 13, and the end cover 133 can be opened under the push of the material. The end cap 133 can be set such that the end cap 133 can only be pushed away when the powder reaches the position of the end cap 133 and is sealed and accumulated. Specifically, the end cover 133 can also be provided with an electromagnetic lock connected to the sensor. The sensor is set to be able to sense the amount of pulverized coal at the end cover 133. to open.

In order to keep the pulverized coal at temperature or be heated during the conveying process, as shown in FIG. 1 and FIG. And a gas flow channel is provided between the feeding pipe 13 . Since the gas usually transported is steam with a certain temperature, when the steam flows through the gas flow channel, it can keep the feeding pipe 13 arranged on the inner side warm, so as to achieve the purpose of heat tracing.

In order to enable the gas flowing in the gas channel to have a swirl effect, as shown in FIG. 4 , the gas channel is provided with swirl blades 134 extending along a helical line around the central axis. When the gas flows through the swirl vane 135 , a certain swirl flow can be generated under the guidance of the swirl vane 135 .

Furthermore, since there is an air passage between the air delivery pipe 21 and the feeding pipe 13, the air delivery pipe 21 lacks a supporting structure, and the strength of the connection is relatively high. In order to solve the above problem, the two sides of the swirl blade 134 The edges are respectively connected to the outer wall of the feeding pipe 13 and the inner wall of the air delivery pipe 21 . That is to say, the swirl vanes 134 can also provide support for the air delivery pipe 21 under the function of providing airflow guidance. As shown in FIG. 1 and FIG. 5 , the gas delivery pipe 21 can be connected to the first flange 123 and the second flange 132 through the third flange 23 .

The gas-solid mixing part 30 can be arranged at the outlet end of the gas delivery pipe 21 and connected thereto, and the gas-solid mixing part 30 can be an expander along the gas flow direction. A flange structure may also be provided at the outlet of the gas-solid mixing part 30 to facilitate connection with other pipelines.

In order to enhance the heat tracing effect on the feeding pipe 13 as much as possible, as shown in FIG. 5 , the air inlet pipe 22 is arranged at an end far away from the outlet of the pneumatic conveying device 20 . The gas can flow through most of the area of the feeding pipe 13 as much as possible to achieve a better heat tracing effect.

In order to make the material sent into the feed pipe 13 directly fall into the feed pipe without the need for additional device assistance, the powder pneumatic conveying pump also includes a feed pipe 121, the feed pipe 121 is vertically arranged, so The bottom end of the feed pipe 121 communicates with the feed port.

Furthermore, the bottom of the powder pneumatic conveying pump is also provided with a supporting frame 40 as a supporting function.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of specific technical features in any suitable manner. In order to avoid unnecessary repetition, various possible combinations are not further described in the present invention. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention, and all belong to the protection scope of the present invention.

Claims (10)

1. The utility model provides a powder air conveying pump, its characterized in that, includes powder feeder (10), air conveying device (20) and gas-solid mixing portion (30), the export of powder feeder (10) with the export of air conveying device (20) meet in gas-solid mixing portion (30), powder feeder (10) including have conveying pipe (13) of convergent section (131) and set up in conveying part (11) in conveying pipe (13), conveying part (11) can with the material propelling movement extremely gas-solid mixing portion (30), the internal diameter of convergent section (131) sets up to become gradually along the material direction of delivery, the internal diameter of conveying pipe (13) is in the external part of convergent section (131) is along the material direction of delivery unchangeable.

2. A powder pneumatic conveying pump according to claim 1, wherein the conveying member (11) comprises a main shaft (114) provided along a central axis of the feed pipe (13) and a helical blade (116) provided around the main shaft (114).

3. A powder pneumatic conveying pump according to claim 2, wherein the outer edges of the helical blades (116) are in sealing engagement with the inner wall of the tapered section (131), the helical blades (116) being equidistant helical blades.

4. A powder pneumatic conveying pump according to claim 3, wherein the conveying member (11) further comprises a driving assembly capable of driving the main shaft (114) to rotate.

5. A powder pneumatic conveying pump according to claim 2, wherein the powder feeding device (10) further comprises an end cap (133) rotatably hinged at the outlet of the feeding tube (13), the end cap (133) being openable under the pushing of the material.

6. Pneumatic powder conveying pump according to claim 1, characterized in that the pneumatic conveying device (20) comprises a gas conveying pipe (21), wherein the gas conveying pipe (21) is coated on the outer side of the conveying pipe (13) and a gas flow passage is arranged between the gas conveying pipe and the conveying pipe (13).

7. A powder pneumatic conveying pump according to claim 6, wherein swirl vanes (134) extending along a spiral line around the central axis are provided in the gas flow passage.

8. Powder pneumatic conveying pump according to claim 7, characterized in that the two side edges of the swirl vanes (134) are respectively connected to the outer wall of the feed pipe (13) and the inner wall of the gas pipe (22).

9. A powder pneumatic conveying pump according to claim 6, wherein the air inlet pipe (22) is provided at an end remote from the outlet of the pneumatic conveying means (20).

10. The powder pneumatic conveying pump according to claim 1, further comprising a feeding pipe (121), wherein the feeding pipe (121) is vertically arranged, and the bottom end of the feeding pipe (121) is communicated with the feeding port.