CN106315231B

CN106315231B - Injection type high-efficiency pneumatic conveying system

Info

Publication number: CN106315231B
Application number: CN201610840039.3A
Authority: CN
Inventors: 常熹钰; 郑德明; 邱伟
Original assignee: Hunan Huifeng Environmental Protection Technology Development Co ltd
Current assignee: Hunan Huifeng Environmental Protection Technology Development Co ltd
Priority date: 2016-09-22
Filing date: 2016-09-22
Publication date: 2020-07-07
Anticipated expiration: 2036-09-22
Also published as: CN106315231A

Abstract

An injection type high-efficiency pneumatic conveying system comprises a primary injector, a mixing section, a diffusion section and a pipeline which are sequentially connected, wherein the primary injector comprises an inner sleeve and an outer sleeve, the inner sleeve is positioned in the outer sleeve, a gas source entering cavity is formed between the inner sleeve and the outer sleeve, and the cross sectional area of the gas source entering cavity is gradually reduced along the airflow direction; the sleeve wall of the inner sleeve is provided with an airflow hole. The invention does not need to additionally arrange an air locking device, and has the advantages of lower manufacturing cost, high solid-gas mixing efficiency and low energy consumption.

Description

Injection type high-efficiency pneumatic conveying system

Technical Field

The invention relates to an injection type high-efficiency pneumatic conveying system.

Background

The pneumatic pipeline conveying is one common conveying mode in industrial material conveying industry, and has important significance in conveying powder and granular material.

The injection type pneumatic conveying pump has several disadvantages in use: under the conditions of increased air source pressure and increased flow, reverse air channeling can occur, the feeding machine cannot work normally, the feeding machine needs to be provided with an air locking design, the machining precision requirement is high, the cost is increased, related parts are quickly abraded, and particularly the nozzle is seriously abraded; the mixing of ash and gas is vertical intersection, excessive energy consumption is generated in the mixing process, the mixing generation interval is limited, and the system efficiency is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the background technology and provide an injection type high-efficiency pneumatic conveying system with high working efficiency, low manufacturing cost and lower energy consumption.

The invention solves the technical problem and adopts the technical scheme that an injection type high-efficiency pneumatic conveying system comprises a primary injector, a mixing section, a diffusion section and a pipeline which are sequentially connected, and is characterized in that: the primary ejector comprises an inner sleeve and an outer sleeve, the inner sleeve is positioned in the outer sleeve, an air source inlet cavity is formed between the inner sleeve and the outer sleeve, and the cross-sectional area of a channel of the air source inlet cavity is gradually reduced along the airflow direction; the sleeve wall of the inner sleeve is provided with an airflow hole.

Furthermore, the inner sleeve is in a hollow cylindrical shape, the outer sleeve is in a hollow circular truncated cone shape, and the end face with the smaller area of the outer sleeve is connected with one end of the mixing section.

Furthermore, end covers are arranged at the end parts of the inner sleeve and the outer sleeve, and an air source inlet port and a material inlet port are arranged on the end covers.

Furthermore, the end cover, the inner sleeve and the outer sleeve are sealed through rubber gaskets.

Furthermore, a plurality of airflow holes are formed in the sleeve wall of the inner sleeve.

Furthermore, the air flow holes form an included angle of 10-60 degrees with the vertical direction.

Furthermore, the aperture of each airflow hole is 2-4 mm.

Furthermore, a rotation guiding sheet is arranged on the inner wall of the outer sleeve, and an included angle of 15-60 degrees is formed between the rotation guiding sheet and the central axis of the primary ejector.

Further, the pipeline comprises an upstream pipeline and a downstream pipeline; the two-stage ejector is arranged between the upstream pipeline and the downstream pipeline, and the structure of the two-stage ejector is the same as that of the one-stage ejector.

And further, the structure of the ejector with three or more stages is the same as that of the primary ejector.

Compared with the prior art, the invention has the following advantages: (1) the ejector comprises an inner sleeve and an outer sleeve, the inner sleeve is used for feeding, a cavity between the inner sleeve and the outer sleeve is used for air inlet, an airflow hole is formed in the sleeve wall of the inner sleeve, an air locking device is not required to be additionally arranged, the manufacturing cost is low, the solid-gas mixing efficiency is high, and the energy consumption is low; (2) the inner wall of the outer sleeve is provided with the rotation guide sheet, and most of materials are positioned in the middle of the pipeline and do not contact with the pipe wall by utilizing the mechanical characteristic of rotary flow, so that the scouring erosion of the materials to the pipe wall is reduced, the abrasion of parts is small, and the service life is long.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the primary ejector of the embodiment shown in fig. 1.

Fig. 3 is a schematic structural view of the airflow holes of the inner sleeve of the embodiment shown in fig. 1.

Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

Example 1

Referring to fig. 1, the embodiment includes a first-stage ejector 1, a mixing section 2, a diffusion section 3, and a pipeline 4, which are connected in sequence, where the pipeline 4 includes an upstream pipeline and a downstream pipeline; referring to fig. 2, the primary ejector 1 comprises an inner sleeve 1-2 and an outer sleeve 1-3, wherein the inner sleeve 1-2 is in a hollow cylinder shape, the outer sleeve 1-3 is in a hollow circular truncated cone shape, the inner sleeve 1-2 is positioned in the outer sleeve 1-3, and the end face of the outer sleeve 1-3 with a smaller area is connected with one end of the mixing section 2; an air source entering cavity is formed between the inner sleeve 1-2 and the outer sleeve 1-3, and the cross sectional area of the air source entering the cavity is gradually reduced along the airflow direction.

End covers are arranged at the end parts of the inner sleeve 1-2 and the outer sleeve 1-3, the end covers are sealed with the inner sleeve 1-2 and the outer sleeve 1-3 through rubber pads 1-1, and an air source inlet port and a material inlet port are arranged on the end covers; the inner wall of the outer sleeve 1-3 is provided with a rotation guide sheet 1-4, and the rotation guide sheet 1-4 and the central axis of the primary ejector 1 form an included angle of 30 degrees; referring to fig. 3, a plurality of airflow holes 1-5 are formed on the sleeve wall of the inner sleeve 1-2, and the airflow holes 1-5 form an included angle of 15 degrees with the vertical direction; the aperture of each airflow hole 1-5 is 3 mm.

When the device is used, an air source enters the cavity through the air source inlet port, materials enter the inner sleeve 1-2 through the material inlet port, the air source enters the cavity forwards along the air source, the airflow is gradually accelerated, the speed is the largest at the narrowest cross section of a channel of the cavity, the static pressure is reduced, and a low-pressure section is formed at the outlet of the inner sleeve 1-2. Due to the low-pressure suction, the high-speed airflow forms strong injection to the materials. A small amount of airflow passes through the inclined airflow holes 1-5 to enable the airflow to enter the inner sleeve 1-2 in an inclined state, so that the disturbance of materials can be strengthened, the fluidization of the materials is further accelerated, and the solid-gas mixing efficiency is further improved. The fluidized material is mixed with the air flow in a low-pressure region, kinetic energy given by the air flow is obtained, the solid-gas mixed flow (the mixture of the air source and the material) achieves uniform velocity field in a mixing section, the speed reduction and the pressure increase are carried out in a diffusion section, and then the solid-gas mixed flow is smoothly discharged into an ash silo 6 along a downstream pipeline 4, so that the ash conveying process is completed.

The rotating guide pieces 1-4 on the inner walls of the outer sleeves 1-3 can enable air flow to flow in a rotating mode, solid-gas mixed flow is in a rotating state in the pipeline, most of materials are located in the middle of the pipeline and do not contact with the pipe wall by utilizing the mechanical characteristics of the rotating flow, erosion and corrosion of the materials to the pipe wall are reduced, abrasion of the pipeline and a nozzle is reduced, equipment maintenance cost is low, and the service life is long.

Example 2

Referring to fig. 4, under the condition that the ash conveying distance is long, the pipeline is long, and the loss of the flow along the way is large, a secondary ejector 5 is further arranged, the secondary ejector 5 is arranged between the upstream pipeline and the downstream pipeline, the structure of the secondary ejector 5 is the same as that of the primary ejector 1, and long-distance material conveying is completed by additionally arranging the secondary ejector 5.

In addition, a third level or more than three levels of ejectors can be additionally arranged according to requirements.

Various modifications and variations of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.

What is not described in detail in the specification is prior art that is well known to those skilled in the art.

Claims

1. The utility model provides a high-efficient pneumatic conveying system of injection type, includes one-level ejector (1), mixing section (2), diffusion section (3) and pipeline (4) that connect gradually, its characterized in that: the primary ejector (1) comprises an inner sleeve (1-2) and an outer sleeve (1-3), the inner sleeve (1-2) is located in the outer sleeve (1-3), an air source inlet cavity is formed between the inner sleeve (1-2) and the outer sleeve (1-3), and the cross-sectional area of an air source inlet cavity along the airflow direction is gradually reduced; a plurality of airflow holes (1-5) are formed in the sleeve wall of the inner sleeve (1-2), and the airflow holes (1-5) form an included angle of 10-60 degrees with the vertical direction; the inner wall of the outer sleeve (1-3) is provided with a rotation guiding sheet (1-4), and the rotation guiding sheet (1-4) and the central axis of the primary ejector (1) form an included angle of 10-60 degrees.

2. The high-efficiency pneumatic transmission system of claim 1, wherein: the above-mentioned

The inner sleeve (1-2) is in a hollow cylinder shape, the outer sleeve (1-3) is in a hollow circular truncated cone shape, and the end face with the smaller area of the outer sleeve (1-3) is connected with one end of the mixing section (2).

3. The injection type high-efficiency pneumatic conveying system according to claim 1 or 2, characterized in that: end covers are arranged at the end parts of the inner sleeve (1-2) and the outer sleeve (1-3), and an air source inlet port and a material inlet port are arranged on the end covers.

4. The ejector-type high-efficiency pneumatic conveying system according to claim 3, characterized in that: the end cover is sealed with the inner sleeve (1-2) and the outer sleeve (1-3) through the rubber gasket (1-1).

5. The high-efficiency pneumatic transmission system of claim 1, wherein: the aperture of each airflow hole (1-5) is 2-4 mm.

6. The injection type high-efficiency pneumatic conveying system according to claim 1 or 2, characterized in that: the pipeline (4) comprises an upstream pipeline and a downstream pipeline; the two-stage ejector is characterized by further comprising a second-stage ejector (5), the second-stage ejector (5) is arranged between the upstream pipeline and the downstream pipeline, and the structure of the second-stage ejector (5) is the same as that of the first-stage ejector (1).

7. The high-efficiency pneumatic transmission system of claim 6, wherein: the structure of the ejector with three or more stages is the same as that of the primary ejector (1).