WO2019200712A1

WO2019200712A1 - Precise pressure increasing system and method for pneumatic transport

Info

Publication number: WO2019200712A1
Application number: PCT/CN2018/093019
Authority: WO
Inventors: 杨道龙; 王雁翔; 李建平; 邢邦圣; 周锋; 余柄辰; 田世伟; 田超
Original assignee: 江苏师范大学
Priority date: 2018-04-16
Filing date: 2018-06-27
Publication date: 2019-10-24
Also published as: CN108584444A; AU2018418036A1; AU2018418036B2

Abstract

A precise pressure increasing system for pneumatic transport comprises a pneumatic material transport pipe (10). The pneumatic material transport pipe (10) is provided with a pressure measurement device (7) and a pressure increasing device (8) sequentially arranged in a material flow direction. The pressure measurement device (7) comprises a pressure measurement pipe (7-4) and a pressure sensor (7-1). The left and right ends of the pressure measurement pipe (7-4) are connected to the pneumatic material transport pipe (10). The pressure sensor (7-1) is arranged above a central portion of the pressure measurement pipe (7-4). The pressure increasing device (8) comprises a pressure increasing pipe (8-5), an electrically-controlled directional control valve (6), a flow meter (5), an electrically-controlled flow valve (4) and a high-pressure air transport pipe (3). The left and right ends of the pressure increasing pipe (8-5) are connected to the pneumatic material transport pipe (10). The pressure increasing pipe (8-5) is provided with three pressure increasing valves. The invention further comprises a data collection device and a data analysis controller which are electrically connected. The system meets a pressure requirement of a pipe while preventing an excessive pressure increment.

Description

Pneumatic conveying precision supercharging system and method

Technical field

The invention relates to a pneumatic conveying precision supercharging system and method, which is suitable for an air pneumatic conveying system of a dilute phase and a dense phase inert material.

Background technique

A pneumatic conveying system is a conveying system that transports granular materials in a pipeline by using a gas stream having a certain pressure and a certain speed. The pneumatic conveying pipeline is generally a mixed medium of air and powder materials, and belongs to the category of gas-solid two-phase flow. During the pneumatic conveying process, due to the friction between the material and the pipe and the friction between the materials, the conveying speed of the material is gradually reduced, and finally the material is blocked at a position where the pressure loss is large such as a bent pipe or a bifurcated pipe. Therefore, multiple sets of pressurization equipment are often added to the pneumatic conveying system to prevent pipe blockage.

However, the existing pneumatic boosting devices and methods have problems such as insufficient or excessive pressurization, easy damage of the pressure measuring system, and the inability to perform more precise supercharging behavior, thereby restricting the development of the pneumatic conveying system.

Summary of the invention

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a pneumatic conveying precision supercharging system and method, which can generate a relatively reasonable axial flow pressurized flow field or a swirling pressurized flow field, which can satisfy the partial or overall supercharging of the pipeline. The demand can prevent problems such as material crushing and energy loss caused by over-pressurization.

The technical solution adopted by the present invention to solve the technical problems thereof is:

A pneumatic conveying precision supercharging system comprises a material pneumatic conveying pipeline, wherein a pressure measuring device and a supercharging device are sequentially arranged along the material flow direction on the material pneumatic conveying pipeline; the pressure measuring device comprises a pressure measuring tube and a pressure sensor The left and right ends of the pressure measuring tube are connected with the material pneumatic conveying pipeline, and the upper end of the pressure measuring tube is connected with the pressure sensor; the supercharging device comprises a boosting tube, an electronically controlled reversing valve, a flow meter, an electronically controlled flow valve and high pressure air. The conveying pipe, the left and right ends of the boosting pipe are connected to the material pneumatic conveying pipe, and the boosting pipe is provided with three pressure increasing valves, and the pipe wall of the boosting pipe is provided with three radial valve holes and three axial directions. The annular plenum chamber, three valve holes are evenly distributed in the axial direction, the pressure increasing valve is installed in the valve hole, one end of the boosting valve is connected to the annular plenum chamber, and the other end is connected to the outlet of the electronically controlled directional control valve, electronically controlled The inlet of the reversing valve is connected to the outlet of the flow meter, the inlet of the meter is connected to the outlet of the electronically controlled flow valve, the inlet of the electronically controlled flow valve is connected to the high pressure air delivery tube; the data acquisition instrument and the data analysis control including the electrical connection are also included , The data output end of the pressure sensor of the pressure measuring device is connected to the data collecting instrument through a data transmission line, and the control end of the electronically controlled reversing valve is connected with the data analysis controller, and the data output end of the flow meter is connected to the data collecting instrument through the data transmission line, and the electric The control end of the flow control valve is connected to the data analysis controller.

A pneumatic conveying precision boosting method, the steps are as follows:

1) arranging a plurality of sets of pressure measuring devices and pressurizing devices in the material pneumatic conveying pipeline;

2) The pressure measuring device obtains the flow field pressure change in the pneumatic conveying pipeline system, and transmits the data to the data collecting instrument through the data line, and the data collecting instrument transmits the collected pressure data to the data analysis controller;

3) The data analysis controller analyzes the obtained flow field pressure change and compares it with the preset normal delivery value of the pneumatic conveying;

4) When the obtained pressure value is less than the set value, the data analysis controller controls the corresponding electronically controlled flow valve to open, and the high pressure air passes through the high pressure air delivery pipe, the electronically controlled flow valve, the flow meter, the electronically controlled reversing valve and the supercharging The tube enters the material pneumatic conveying pipeline;

5) When the passage of the electronically controlled reversing valve is connected to the axial flow boosting hole on the booster tube, the high pressure airflow in the high pressure air conveying pipe enters the axial flow boosting hole to generate an axial flow pressurized flow field;

6) When the passage of the electrically controlled directional control valve opens the radial booster hole on the booster tube, the high pressure airflow in the high pressure air delivery duct enters the radial booster hole to generate a pure pressurized flow field;

7) When the passage of the electronically controlled reversing valve is connected to the swirling boosting hole on the boosting tube, the high-pressure airflow in the high-pressure air conveying duct enters the swirling boosting hole, and a swirling pressurized flow field can be generated;

8) During the pressurization process, the pressure measuring device and the flow meter feed back the pressure and flow data to the data analysis controller through the data acquisition instrument, and the data analysis controller analyzes the feedback data to the opening of the corresponding electronically controlled flow valve. The position and opening time of the electronically controlled directional control valve are adjusted and controlled to generate a suitable axial flow pressurized flow field, pure pressurized flow field or swirling pressurized flow field, and the precise pressurized flow rate at the position is obtained. Pressure mode and boost time.

Compared with the prior art, the pneumatic conveying precision supercharging system and method of the present invention changes the flow field pressure in the pneumatic conveying pipeline system by arranging a plurality of sets of pressure measuring devices and supercharging devices in the material pneumatic conveying pipeline. , into the data acquisition instrument and data analysis controller, and compared with the preset normal delivery value. When the obtained pressure value is less than the set value, the data analysis controller controls the corresponding electronically controlled flow valve and the electronically controlled directional control valve to open the radial boosting hole of the boosting device to generate a pure pressurized flow field; The pressure measuring device and the flow meter feed back the pressure and flow data to the data analysis controller in time, and adjust the opening of the corresponding electronically controlled flow valve, the position and opening time of the electronically controlled reversing valve by analyzing the feedback data. And control, to generate a more reasonable axial flow pressurized flow field or swirling pressurized flow field to obtain the precise supercharging flow rate, supercharging mode and supercharging time of the position, so as to meet the requirements of partial or overall supercharging of the pipeline It can prevent problems such as material crushing and energy loss caused by over-pressurization, and has strong innovation and wide practicality.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

FIG. 1 is a structural diagram of a system according to an embodiment of the present invention.

2 is a schematic structural view of the pressure measuring device of FIG. 1.

3 is a schematic structural view of the supercharging device of FIG. 1.

Figure 4 is an enlarged view of B in Figure 3.

In the figure: 1, data acquisition instrument, 2, data analysis controller, 3, high pressure air delivery pipe, 4, electronically controlled flow valve, 5, flow meter, 6, electronically controlled reversing valve, 7, pressure measuring device, 8 , supercharger, 9, connecting flange, 10, material pneumatic conveying pipeline, 7-1, pressure sensor, 7-2, dust can, 7-3, filter, 7-4, pressure tube, 8- 1. Axial flow booster hole, 8-2, radial booster hole, 8-3, swirling booster hole, 8-4, booster tube, 8-5, valve spring, 8-6, high pressure pipeline, 8-7, hemispherical valve, 8-8, annular plenum, 8-9, valve hole.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a part of the embodiment of the invention, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 to 4 are schematic views showing the structure of a preferred embodiment of the present invention. A pneumatic conveying precision boosting system of Fig. 1 includes a material pneumatic conveying pipe 10 on the material pneumatic conveying pipe 10 The material flow direction is arranged at intervals to set the pressure measuring device 7 and the pressure increasing device 8; preferably, the plurality of pressure measuring devices 7 and the pressure increasing device 8 are arranged on the material pneumatic conveying pipe 10, and the pressure increasing device 8 and the pressure measuring device 7 are formed. For the installation; in particular, the pressure measuring device 7 and the charging device 8 are connected to the material pneumatic conveying pipe 10 through the connecting flange 9. 2, the pressure measuring device 7 includes a pressure measuring tube 7-4 and a pressure sensor 7-1, and the pressurized tube 8-4 should be pressed and formed by powder metallurgy technology to have a strong The wear resistance, the left and right ends of the pressure measuring tube 7-4 are connected to the material pneumatic conveying pipe 10, and the upper end of the pressure measuring tube 7-4 is connected with the pressure sensor 7-1; see FIG. 3 and FIG. 8 includes a booster tube 8-4, an electronically controlled directional control valve 6, a flow meter 5, an electronically controlled flow valve 4, and a high pressure air delivery pipe 3, and the left and right ends of the booster pipe 8-4 are connected to the material pneumatic conveying pipe 10, The booster tube 8-4 is provided with three pressure increasing valves, and the tube wall of the boosting tube 8-4 is provided with three radial valve holes 8-9 and three circumferential annular pressurized chambers 8-8. The three valve holes 8-9 are evenly distributed in the axial direction, the pressure increasing valve is installed in the valve hole 8-9, the one end of the pressure increasing valve is connected to the annular plenum chamber 8-8, and the other end is connected to the electronically controlled directional control valve 6 The outlet is connected, and the different valve positions of the electronically controlled directional control valve 6 are controlled to obtain different supercharging modes, thereby generating an axial flow pressurized flow field, a pure pressurized flow field and a swirling pressurized flow field; the electronically controlled directional control valve 6 inlet and outlet of flow meter 5 The inlet of the meter 5 is connected to the outlet of the electronically controlled flow valve 4, and the inlet of the electronically controlled flow valve 4 is connected to the high-pressure air delivery pipe 3; the data acquisition device 1 and the data analysis controller 2 for electrical connection are also included, and the pressure is measured. The data output end of the pressure sensor 7-1 of the device 7 is connected to the data acquisition device 1 through a data transmission line, and the control end of the electronically controlled directional control valve 6 is connected to the data analysis controller 2, and the data output end of the flow meter 5 passes through the data transmission line and The data acquisition device 1 is connected, and the control end of the electronically controlled flow valve 4 is connected to the data analysis controller 2.

As shown in FIG. 3 and FIG. 4, the three annular pressurized chambers 8-8 of the supercharging device 8 are respectively provided with an axial flow boosting hole 8-1, a radial pressure increasing hole 8-2 and a swirling flow. One end of the boosting hole 8-3, the axial flow pressurizing hole 8-1, the radial boosting hole 8-2 and the swirling pressurizing hole 8-3 are connected to the annular pressurizing chamber 8-8, and the other end is connected and increased. The inner cavity of the pressure tube, the radial pressure increasing hole 8-2 is perpendicular to the axial direction of the pressure increasing tube 8-4, and generates a pure pressurized flow field; the axial pressure increasing hole 8-1 and the pressure increasing tube 8-4 are axially formed. An inclination angle of 5° to 85° generates an axial flow pressurized flow field; the swirling pressure boosting hole 8-3 has an inclination angle of 5° to 85° with respect to the axial direction of the supercharger tube 8-4, and a booster tube The 8-4 axial direction has a skew angle of 5° to 85°, resulting in a swirling pressurized flow field. Further, the valve hole 8-9 is provided with a valve spring 8-5, a high pressure pipe 8-6 and a hemispherical valve 8-7, and the end of the high pressure pipe 8-6 is threadedly connected with the upper end of the valve hole 8-9 by a thread. The lower end of the high pressure pipe 8-6 is in contact with the upper end of the hemispherical valve 8-7, and the lower end of the hemispherical valve 8-7 is connected to the outlet of the valve hole 8-9 through the valve spring 8-5, and the outlet diameter of the valve hole 8-9 is contracted. Connected to the annular plenum chamber 8-8.

As shown in FIG. 2, the pressure measuring device 7 further includes a dustproof can 7-2 and a filter net 7-3. The upper end of the pressure measuring tube 7-4 has a pressure measuring hole, and the dustproof can 7-2 is installed at A pressure filter 7-3 is installed between the pressure measuring hole and the dustproof can 7-2, and a pressure sensor 7-1 is mounted on the upper portion of the dustproof can 7-2. The filter 7-3 and the dustproof tank 7-2 can prevent the conveying material particles from blocking the pressure measuring hole and prevent the material dust from entering the pressure sensor 7-1, thereby affecting the measurement result.

A pneumatic conveying precision boosting method, the steps are as follows:

1) in the material pneumatic conveying pipe 10, a plurality of sets of pressure measuring device 7 and a charging device 8;

2) The pressure measuring device 7 obtains the flow field pressure change in the pneumatic conveying pipeline system, and transmits it to the data collecting instrument 1 through the data line, and the data collecting instrument 1 transmits the collected pressure data to the data analyzing controller 2;

3) The data analysis controller 2 analyzes the obtained flow field pressure change and compares it with a preset normal delivery value of the pneumatic conveying;

4) When the obtained pressure value is less than the set value, the data analysis controller 2 controls the corresponding electronically controlled flow valve 4 to be opened, and the high pressure air is passed through the high pressure air delivery pipe 3, the electronically controlled flow valve 4, the flow meter 5, and the electronically controlled Entering the material pneumatic conveying pipe 10 to the valve 6 and the boosting pipe 8-4;

5) When the passage of the electrically controlled directional control valve 6 opens the axial flow plenum 8-1 on the booster pipe 8-4, the high pressure airflow in the high pressure air delivery pipe 3 enters the axial flow plenum 8-1, Generating an axial flow pressurized flow field;

6) When the passage of the electrically controlled directional control valve 6 opens the radial plenum hole 8-2 on the booster pipe 8-4, the high pressure airflow in the high pressure air delivery duct 3 enters the radial plenum hole 8-2, Producing a pure pressurized flow field;

7) When the passage of the electrically controlled directional control valve 6 opens the swirling plenum hole 8-3 on the boosting pipe 8-4, the high-pressure airflow in the high-pressure air conveying pipe 3) enters the swirling plenum hole 8-3 , can generate a swirling pressurized flow field;

8) During the pressurization process, the pressure measuring device 7 and the flow meter 5 feed back the pressure and flow data to the data analysis controller 2 through the data acquisition device 1 in time, and the data analysis controller 2 analyzes the feedback data to the corresponding electronic control. The opening degree of the flow valve 4, the position and the opening time of the electrically controlled directional control valve 6 are adjusted and controlled to generate a suitable axial flow pressurized flow field, a pure pressurized flow field or a swirling pressurized flow field, and the position is obtained. The precise supercharging flow rate, supercharging mode and supercharging time can meet the requirements of partial or overall supercharging of the pipeline, and prevent material crushing and energy loss caused by over-pressurization.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modifications and equivalent changes made to the above embodiments in accordance with the technical spirit of the present invention fall into the present invention. Within the scope of protection of the invention.

Claims

A pneumatic conveying precision supercharging system comprises a material pneumatic conveying pipe (10), characterized in that: on the material pneumatic conveying pipe (10), a pressure measuring device (7) and a supercharging device are arranged at intervals along the material flow direction ( 8);

The pressure measuring device (7) comprises a pressure measuring tube (7-4) and a pressure sensor (7-1), and the left and right ends of the pressure measuring tube (7-4) are connected with the material pneumatic conveying pipe (10), and the pressure is measured. The upper end of the tube (7-4) is connected to the pressure sensor (7-1);

The boosting device (8) comprises a booster tube (8-4), an electronically controlled reversing valve (6), a flow meter (5), an electronically controlled flow valve (4) and a high pressure air delivery tube (3). The left and right ends of the booster tube (8-4) are connected to the material pneumatic conveying pipe (10), and the boosting pipe (8-4) is provided with three pressure increasing valves on the pipe wall of the boosting pipe (8-4). There are three radial valve holes (8-9) and three circumferential annular plenums (8-8), three valve holes (8-9) along the booster tube (8-4) axis Arranged in a uniform arrangement, the pressure increasing valve is installed in the valve hole (8-9), one end of the boosting valve is connected to the annular plenum chamber (8-8), and the other end is connected to the outlet of the electronically controlled directional control valve (6). The inlet of the electronically controlled directional control valve (6) is connected to the outlet of the flow meter (5), the inlet of the meter (5) is connected to the outlet of the electronically controlled flow valve (4), and the inlet and high pressure of the electronically controlled flow valve (4) The air delivery pipe (3) is connected;

The utility model further comprises an electrically connected data acquisition device (1) and a data analysis controller (2), wherein the data output end of the pressure sensor (7-1) of the pressure measuring device (7) is connected to the data acquisition device (1) through the data transmission line. The control end of the electronically controlled directional control valve (6) is connected to the data analysis controller (2), and the data output end of the flow meter (5) is connected to the data acquisition device (1) through the data transmission line, and the electronically controlled flow valve (4) The control terminal is connected to the data analysis controller (2).
The pneumatic conveying precision supercharging system according to claim 1, characterized in that: the three annular plenums (8-8) of the supercharging device (8) are respectively provided with axial flow boosting holes (8-1), radial booster hole (8-2) and swirling booster hole (8-3), axial flow booster hole (8-1), radial booster hole (8-2) and One end of the swirling booster hole (8-3) is connected to the annular pressurizing chamber (8-8), and the other end is connected to the inner cavity of the pilot booster tube, the radial boosting hole (8-2) and the boosting tube ( 8-4) Axial vertical, producing a pure pressurized flow field; axial axial pressure hole (8-1) and the booster tube (8-4) axially inclined at an angle of 5° to 85°, resulting in axial flow increase The pressure flow field; the swirling pressurizing hole (8-3) has an inclination angle of 5° to 85° with respect to the axial direction of the supercharging tube (8-4), and is axially formed with the supercharging tube (8-4). A skew angle of ° to 85° produces a swirling pressurized flow field.
A pneumatic conveying precision supercharging system according to claim 2, wherein the valve hole (8-9) is provided with a valve spring (8-5), a high pressure pipe (8-6) and a hemispherical valve. (8-7), the end of the high-pressure pipe (8-6) is threadedly connected to the upper end of the valve hole (8-9) by a thread, and the upper end of the high-pressure pipe (8-6) is in contact with the upper end of the hemispherical valve (8-7). The lower end of the hemispherical valve (8-7) is connected to the outlet of the valve hole (8-9) through a valve spring (8-5), and the outlet diameter of the valve hole (8-9) is contractively communicated to the annular plenum (8- 8) inside.
A pneumatic conveying precision supercharging system according to claim 1 or 2 or 3, wherein said supercharging tube (8-4) is pressed and formed by powder metallurgy.
A pneumatic conveying precision supercharging system according to claim 2 or 3, characterized in that said pressure measuring device (7) further comprises a dustproof tank (7-2) and a filter net (7-3), A pressure measuring hole is opened at the upper end of the pressure measuring tube (7-4), a dustproof can (7-2) is mounted on the pressure measuring hole, and a filter is installed between the pressure measuring hole and the dustproof can (7-2) (7) -3) Install a pressure sensor (7-1) on the top of the dust can (7-2).
A pneumatic conveying precision supercharging system according to claim 2 or 3, characterized in that: said plurality of pressure measuring devices (7) and a supercharging device (8) are arranged on the material pneumatic conveying pipe (10), The pressurizing device (8) is installed in pairs with the pressure measuring device (7), and the pressure measuring device (7) and the pressurizing device (8) are connected to the material pneumatic conveying pipe (10) through the connecting flange (9).
A pneumatic conveying precision supercharging method, characterized in that the steps are as follows:

1) in the material pneumatic conveying pipe (10), a plurality of sets of pressure measuring devices (7) and a charging device (8);

2) The pressure measuring device (7) obtains the flow field pressure change in the pneumatic conveying pipeline system, and transmits it to the data collecting instrument (1) through the data line, and the data collecting instrument (1) transmits the collected pressure data to the data analysis control. In (2);

3) The data analysis controller (2) analyzes the change of the flow field pressure obtained and compares it with the preset normal delivery value of the pneumatic conveying;

4) When the obtained pressure value is less than the set value, the data analysis controller (2) controls the corresponding electronically controlled flow valve (4) to be opened, the high pressure air passes through the high pressure air delivery pipe (3), and the electronically controlled flow valve (4) , the flow meter (5), the electronically controlled reversing valve (6) and the booster tube (8-4) enter the material pneumatic conveying pipe (10);

5) When the passage of the electrically controlled directional control valve (6) is connected to the axial flow plenum (8-1) on the booster pipe (8-4), the high pressure airflow in the high pressure air delivery pipe (3) enters the shaft Flowing the pressurized hole (8-1) to generate an axial flow pressurized flow field;

6) When the passage of the electrically controlled directional control valve (6) is connected to the radial plenum (8-2) on the booster tube (8-4), the high pressure airflow in the high pressure air delivery duct (3) enters the diameter Producing a pure pressurized flow field to the booster hole (8-2);

7) When the passage of the electrically controlled directional control valve (6) is connected to the swirling plenum (8-3) on the booster tube (8-4), the high pressure airflow in the high pressure air delivery duct (3) enters the vortex Flowing the pressurized hole (8-3) to generate a swirling pressurized flow field;

8) During the pressurization process, the pressure measuring device (7) and the flow meter (5) feed back the pressure and flow data to the data analysis controller (2) through the data acquisition device (1), and the data analysis controller (2) passes Analyze the feedback data, adjust and control the opening of the corresponding electronically controlled flow valve (4), the position and opening time of the electronically controlled directional control valve (6), and generate a suitable axial flow pressurized flow field, pure increase The pressure field or the swirling pressurized flow field obtains the precise boost flow rate, the boost mode and the pressurization time at this position.