CN116534591A - Pneumatic powder conveying pump - Google Patents

Pneumatic powder conveying pump Download PDF

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Publication number
CN116534591A
CN116534591A CN202210088442.0A CN202210088442A CN116534591A CN 116534591 A CN116534591 A CN 116534591A CN 202210088442 A CN202210088442 A CN 202210088442A CN 116534591 A CN116534591 A CN 116534591A
Authority
CN
China
Prior art keywords
conveying
pipe
powder
gas
pump according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210088442.0A
Other languages
Chinese (zh)
Inventor
刘冰
秦强
何立新
赵香龙
王楠
张进华
梁咏诗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
Original Assignee
China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Energy Investment Corp Ltd, National Institute of Clean and Low Carbon Energy filed Critical China Energy Investment Corp Ltd
Priority to CN202210088442.0A priority Critical patent/CN116534591A/en
Publication of CN116534591A publication Critical patent/CN116534591A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/48—Screws or like rotary conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/52—Adaptations of pipes or tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

The invention relates to the technical field of pneumatic conveying equipment, and discloses a powder pneumatic conveying pump which comprises a powder feeding device, a pneumatic conveying device and a gas-solid mixing part, wherein an outlet of the powder feeding device and an outlet of the pneumatic conveying device are intersected at the gas-solid mixing part, the powder feeding device comprises a conveying pipe with a tapered section and a conveying part arranged in the conveying pipe, the conveying part can push materials to the gas-solid mixing part, the inner diameter of the tapered section is gradually reduced along the conveying direction of the materials, and the inner diameter of the part of the conveying pipe outside the tapered section is unchanged along the conveying direction of the materials. In the above technical scheme, the material in the feeding pipe is piled up at the outlet of the powder feeding device under the guidance of the tapered section structure, so that the material can be output after filling the outlet of the powder feeding device, and the reverse steam airflow can be prevented from entering the powder feeding device.

Description

Pneumatic powder conveying pump
Technical Field
The invention relates to the technical field of pneumatic conveying equipment, in particular to a powder pneumatic conveying pump.
Background
The gasification of coal is a production process of using coal as raw material, making organic matter in the coal and gasifying agent produce a series of chemical reactions in specific equipment (such as gasification furnace) under high-temperature and high-pressure so as to make the solid coal be converted into combustible gas. In the medium-and small-sized coal gasification technology, pulverized coal from a pulverized coal bin is usually mixed with steam and conveyed, and the mixture is injected into a gasification furnace chamber through a central pipeline of a gasification furnace nozzle to participate in gasification reaction.
Before pulverized coal enters a gas-solid mixing conveying pipeline, the following adverse phenomena are easy to occur: (1) Reverse steam airflow enters the pulverized coal bin, and formed condensation water and pulverized coal are mixed to cause caking phenomenon, so that normal and smooth discharging of the pulverized coal is affected. (2) The pulverized coal blanking control component, such as a star valve, does not have strict tightness, so that the pulverized coal blanking control component is easy to interfere with reverse steam flow, and the blanking amount of the pulverized coal is difficult to accurately control and measure. (3) The pulverized coal also passes through a weighing screw device and a sealing screw device before entering the gas-solid contact mixing area, and the running path of the pulverized coal is long. Because the two former factory devices do not have heat preservation heat tracing functions, and the later-stage additional heat preservation heat tracing functions are large in setting difficulty and poor in effect, the poor phenomenon of local heat tracing of the devices is caused, and hot pulverized coal is easy to cool in the operation process and is not beneficial to the normal state conveying of the pulverized coal.
Disclosure of Invention
The invention aims to solve the problem that reverse steam enters a pulverized coal bin in the prior art, and provides a powder pneumatic conveying pump.
In order to achieve the above object, the invention provides a powder pneumatic conveying pump, which comprises a powder feeding device, a pneumatic conveying device and a gas-solid mixing part, wherein an outlet of the powder feeding device and an outlet of the pneumatic conveying device are intersected at the gas-solid mixing part, the powder feeding device comprises a conveying pipe with a tapered section and a conveying component arranged in the conveying pipe, the conveying component can push materials to the gas-solid mixing part, the inner diameter of the tapered section is gradually reduced along the conveying direction of the materials, and the inner diameter of a part of the conveying pipe outside the tapered section is unchanged along the conveying direction of the materials.
Optionally, the conveying component includes a main shaft disposed along a central axis of the feed tube and a helical blade disposed about the main shaft.
Optionally, an outer edge of the helical blade is in sealing engagement with an inner wall of the tapered section, the helical blade being an equidistant helical blade.
Optionally, the conveying component further comprises a driving assembly capable of driving the spindle to rotate.
Optionally, the powder feeding device further comprises an end cover rotatably hinged at the outlet of the feeding pipe, and the end cover can be opened under the pushing of the material.
Optionally, the pneumatic conveying device comprises a gas conveying pipe, wherein the gas conveying pipe is coated on the outer side of the conveying pipe, and a gas flow passage is arranged between the gas conveying pipe and the conveying pipe.
Optionally, swirl vanes extending along a spiral line around the central axis are provided in the gas flow passage.
Optionally, the two side edges of the cyclone blade are respectively connected to the outer wall of the feeding pipe and the inner wall of the gas pipe.
Optionally, the air inlet pipe is arranged at one end far away from the outlet of the pneumatic conveying device.
Optionally, the powder pneumatic conveying pump further comprises a feeding pipe, wherein the feeding pipe is vertically arranged, and the bottom end of the feeding pipe is communicated with the feeding port.
Through above-mentioned technical scheme, among the above-mentioned technical scheme, utilize the conveying pipe that has the convergent section, under conveying element's promotion, make the powdery material (usually fine coal) in the conveying pipe can take place the accumulation phenomenon of certain degree in powder feeder's exit area, thereby make the material fully fill up powder feeder's exit, until get into after the gas-solid mixing portion again mix with gas, and then make gas can not permeate through powder feeder's export, consequently, can prevent reverse steam air current to enter into in the powder feeder, and then prevent that the condensate water and the fine coal of steam formation from mixing and causing the caking phenomenon.
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 view of the structure of one embodiment of a conveying member according to the present invention;
FIG. 3 is a schematic view of an embodiment of an end cap according to the present invention;
FIG. 4 is a schematic view of the structure of an embodiment of a feeder tube according to the present invention;
fig. 5 is a schematic view of a gas delivery device according to an embodiment of the present invention.
Description of the reference numerals
10-powder feeding device, 11-conveying component, 111-motor, 112-speed reducer, 113-coupling, 114-main shaft, 115-first helical blade, 116-helical blade, 117-bearing, 12-inlet pipe end cover, 121-inlet pipe, 122-first straight section, 123-first flange, 13-conveying pipe, 131-tapering section, 132-second flange, 133-end cover, 134-swirl vane, 20-pneumatic conveying device, 21-gas pipe, 22-gas inlet pipe, 23-third flange, 30-gas-solid mixing part, 40-support frame.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the present invention, unless otherwise indicated, terms of orientation such as "upper", "lower", "top" and "bottom" are used to generally refer to the orientation of the device or apparatus in the state of use. It should be noted that this is only for convenience in describing the present invention and should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
In the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
The invention provides a powder pneumatic conveying pump, which comprises a powder feeding device 10, a pneumatic conveying device 20 and a gas-solid mixing part 30, wherein an outlet of the powder feeding device 10 and an outlet of the pneumatic conveying device 20 are intersected at the gas-solid mixing part 30, the powder feeding device 10 comprises a feeding pipe 13 with a tapered section 131 and a conveying component 11 arranged in the feeding pipe 13, the conveying component 11 can push materials to the gas-solid mixing part 30, the inner diameter of the tapered section 131 is gradually reduced along the conveying direction of the materials, and the inner diameter of the part of the feeding pipe 13 outside the tapered section 131 is unchanged along the conveying direction of the materials.
It should be noted that, the device can be used for mixing powdery materials with gas, in the process of coal gasification production, pulverized coal is usually used as a raw material, and enters a gasification furnace chamber for gasification reaction after being mixed and conveyed with steam, and in the process of mixing, steam with a certain flow rate is usually utilized, and the pulverized coal is mixed with the gas through an airflow effect, so that the pulverized coal is conveyed into an airflow environment to finish mixing. For ease of understanding, the following description will be given by way of example of coal gasification production, but should not be construed as limiting the embodiments of the present application. The tapering section 131 may be provided as a part of the feed pipe 13 in any part of the feed pipe 13, but in order to ensure that the output pulverized coal can sufficiently fill the outlet of the feed pipe 13, the inner diameter of the feed pipe 13 at the part outside the tapering section 131 is constant in the material conveying direction. For convenience of installation, the tapered section 131 may be disposed at an outlet section of the feeding tube 13, so that an outlet of the tapered section 131 is an outlet of the feeding tube 13, and an outlet of the feeding tube 13 may also be used as an outlet of the powder feeding device 10.
In the above technical solution, by using the feeding pipe 13 with the tapered section 131, under the pushing of the conveying component 11, the powder material (usually pulverized coal) in the feeding pipe 13 can be accumulated to a certain extent in the outlet area of the powder feeding device 10, so that the material can fully fill the outlet of the powder feeding device 10 until entering the gas-solid mixing portion 30 and then be mixed with the gas, and the gas cannot infiltrate through the outlet of the powder feeding device 10, so that the reverse steam flow can be prevented from entering the powder feeding device 10, and the agglomeration phenomenon caused by mixing of the condensed water formed by steam and the pulverized coal can be prevented. In order to achieve a better implementation effect, the method can be set as follows: the flow rate of the material fed into the feed pipe 13 is slightly greater than or equal to the maximum output flow rate of the powder feeding device 10, i.e. the maximum flow rate that can be tolerated at the outlet of the tapered section 131. The amount of powder delivered can thus be measured by measuring the delivery speed of the delivery member 11 and the outlet aperture of the tapered section 131.
The conveying member 11 may have a piston-type pushing structure, and the like, and only needs to push the material from the feeding port to the outlet of the feeding pipe 13, but the material pushing process of the piston-type structure is intermittent and cannot continuously and uniformly operate. As a specific embodiment, as shown in fig. 1 and 2, the conveying member 11 includes a main shaft 114 disposed along a central axis of the feed pipe 13 and a helical blade 116 disposed around the main shaft 114. The pulverized coal can be continuously fed into the feed pipe 13 by applying a uniform and continuous pushing force to the pulverized coal by the rotation of the spiral blade, and the pulverized coal can be continuously fed to the gas-solid mixing section 30 by the feed member 11.
In order to ensure that the material can receive the pushing force transmitted by the conveying member 11, as shown in fig. 2, the outer edge of the spiral blade 116 is in sealing engagement with the inner wall of the tapered section 131, and the spiral blade 116 is an equidistant spiral blade. The sealing engagement of the outer edges of the helical blades 116 with the inner wall of the tapered section 131 can enable the material in each part of the feed pipe 13 to be pushed, and the material can not fully fill the outlet of the tapered section 131 due to insufficient pushing force. Since the outer edges of the helical blades 116 are in sealing engagement with the inner wall of the tapered section 131, a plurality of relatively closed and relatively isolated channels are formed between the inner wall of the tapered section 131 and the helical blades, and equidistant helical blades 116 can keep the diameters of the channels consistent and continuously squeeze forward to ensure that no cavity is generated. While the progressively smaller pitch of the helical blades 116 will lose more power.
More specifically, as shown in fig. 2, the conveying member 11 further includes a driving assembly capable of driving the spindle 114 to rotate. The driving assembly may include a motor 111 and a decelerator 112 connected to the motor 111, and the main shaft 114 may be connected to an output shaft of the decelerator 112 through a coupling 113, thereby driving the main shaft 114 to rotate by driving the motor 111.
As a specific embodiment, the feeding pipe 13 may further include a feeding pipe end cover 12 as shown in fig. 1, 3 and 4, the feeding pipe end cover 12 is connected with the tapered section 131 to form the feeding pipe 13 together, the feeding pipe end cover 12 and the feeding pipe 13 may be connected by a first flange 123 and a second flange 132 and ensure the tightness of the connection, a first straight section 122 may be further disposed between the feeding pipe end cover 12 and the tapered section 131 as a connection, the feeding pipe end cover 12 is also in a cylindrical structure, and the first spiral blade 115 may be correspondingly disposed in the feeding pipe end cover 12, and the first spiral blade 115 is an equal-diameter equidistant spiral blade. The material entering this zone is able to be thoroughly stirred by the first helical blade 115 and give the material an initial pushing force. The connecting part between the main shaft 114 and the feed pipe end cover 12 can be provided with a bearing 117, and the bearing 117 can be a dustproof support bearing, so that the dust-free feed pipe can work for a long time in a dust-free environment, and the maintenance operation requirement is reduced. Further, more bearings 117 may be disposed in the feeding tube 13 at the axial line through a supporting rod, one end of the supporting rod is connected to the bearings 117, and the other end is fixedly connected to the inner wall of the feeding tube 13.
When the amount of pulverized coal fed into the feed pipe 13 is smaller than the diameter flow at the outlet of the tapered section 131, the powder cannot fully fill the outlet of the feed pipe 13, and in order to solve this problem, as shown in fig. 4, the powder feeding device 10 further includes an end cover 133 rotatably hinged to the outlet of the feed pipe 13, and the end cover 133 can be opened under the pushing of the material. The end cap 133 may be configured to: after the powder reaches the end cap 133 and a seal builds up, the end cap 133 may be pushed open. Specifically, the end cover 133 can be further provided with an electromagnetic lock communicated with the inductor, the inductor is arranged to sense the pulverized coal amount of the end cover 133, and the electromagnetic lock can be opened only after the inductor senses the pulverized coal amount to meet the requirement.
In order to maintain the pulverized coal at a temperature or to be heated during the transportation process, as shown in fig. 1 and 5, the pneumatic transportation device 20 includes a gas pipe 21, and the gas pipe 21 is wrapped on the outer side of the material feeding pipe 13 and a gas flow path is provided between the gas pipe and the material feeding pipe 13. Since the gas to be conveyed is normally steam having a certain temperature, the heat can be preserved for the feed pipe 13 provided inside when the steam flows through the gas flow passage, thereby achieving the purpose of heat tracing.
In order to enable the swirling effect of the gas flowing in the gas flow passage, swirl vanes 134 extending along a spiral line around the central axis are provided in the gas flow passage as shown in fig. 4. When the gas flows through the swirl blades 135, a certain swirl can be generated under the guidance of the swirl blades 135.
Furthermore, since the air flow channel is provided between the air pipe 21 and the feeding pipe 13, the air pipe 21 lacks a supporting structure, and the strength requirement on the joint is high, so as to solve the above problem, the two side edges of the swirl blades 134 are respectively connected to the outer wall of the feeding pipe 13 and the inner wall of the air pipe 21. I.e., swirl vanes 134, provide support for air delivery conduit 21 as well as airflow guidance. As shown in fig. 1 and 5, the gas delivery pipe 21 may be connected to the first flange 123 and the second flange 132 through the third flange 23.
The gas-solid mixing part 30 may be disposed at the outlet end of the gas pipe 21 and connected thereto, and the gas-solid mixing part 30 may be a diverging pipe along the gas flow direction. The outlet of the gas-solid mixing part 30 can be provided with a flange structure to facilitate connection with other pipelines.
In order to enhance the heat tracing effect on the feed pipe 13 as much as possible, the air inlet pipe 22 is provided at an end far from the outlet of the pneumatic conveying apparatus 20 as shown in fig. 5. So that the gas can flow through most areas of the feed pipe 13 as much as possible, and a better heat tracing effect is achieved.
In order to enable the material fed into the feeding pipe 13 to fall into the feeding pipe directly without additional assistance of a device, the powder pneumatic conveying pump further comprises 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 hole.
Further, a supporting frame 40 for supporting is arranged at the bottom of the powder pneumatic conveying pump.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

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.
CN202210088442.0A 2022-01-25 2022-01-25 Pneumatic powder conveying pump Pending CN116534591A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210088442.0A CN116534591A (en) 2022-01-25 2022-01-25 Pneumatic powder conveying pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210088442.0A CN116534591A (en) 2022-01-25 2022-01-25 Pneumatic powder conveying pump

Publications (1)

Publication Number Publication Date
CN116534591A true CN116534591A (en) 2023-08-04

Family

ID=87454696

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210088442.0A Pending CN116534591A (en) 2022-01-25 2022-01-25 Pneumatic powder conveying pump

Country Status (1)

Country Link
CN (1) CN116534591A (en)

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