CN210392925U - Elbow electrostatic protection device and pneumatic conveying experiment system - Google Patents

Elbow electrostatic protection device and pneumatic conveying experiment system Download PDF

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Publication number
CN210392925U
CN210392925U CN201920840610.0U CN201920840610U CN210392925U CN 210392925 U CN210392925 U CN 210392925U CN 201920840610 U CN201920840610 U CN 201920840610U CN 210392925 U CN210392925 U CN 210392925U
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China
Prior art keywords
elbow
straight pipe
aluminum foil
foil paper
paper layer
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CN201920840610.0U
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Chinese (zh)
Inventor
赵彦琳
姚军
房佳
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China University of Petroleum Beijing
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China University of Petroleum Beijing
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Abstract

The utility model relates to an return bend electrostatic protection device and pneumatic transmission experimental system, this return bend electrostatic protection device include the relative first flat board and the second flat board that sets up in bent angle both sides of return bend, first flat board with form bent angle electric field between the second flat board, first flat board with connect DC power supply portion and slide rheostat electrically between the second flat board, slide rheostat can slide and change the size of bent angle electric field power. The utility model discloses a can make and carry granule atress balanced in the electric field, avoid carrying the bent angle department lateral wall of granule collision return bend, reduce the wearing and tearing of return bend, effectively protect the return bend, improve the material transport efficiency who carries the granule.

Description

Elbow electrostatic protection device and pneumatic conveying experiment system
Technical Field
The utility model relates to a pneumatic conveying technical field especially relates to a return bend electrostatic protection device and pneumatic conveying experimental system.
Background
The pneumatic conveying experiment system is widely applied to the industries of energy, chemical industry, pharmacy and the like and the transportation of particle materials in material processing. In a pneumatic conveying experiment system, due to collision and friction between particles and pipe walls, the particles and the wall surfaces of system pipelines tend to acquire electrostatic charges, and the abrasion of the bent pipe walls is the most serious. The accumulation of charge on system components is accompanied by the risk of discharge of the charge at any time, while the presence of static electricity in the system seriously affects the efficiency of particulate matter transport. Therefore, the electrostatic protection of the pipeline effectively has very important significance on the influence of the flow of the granular materials.
Therefore, the utility model discloses the people relies on experience and practice of engaging in relevant trade for many years, provides return bend electrostatic protection device and pneumatic conveying experimental system to overcome prior art's defect.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a return bend electrostatic protection device and pneumatic conveyor experimental system, this utility model can make the transport granule atress balanced in the electric field, avoids carrying the bent angle department lateral wall of granule collision return bend, reduces the wearing and tearing of return bend, effectively protects the return bend, improves the material transport efficiency who carries the granule.
The utility model aims at realizing like this, a return bend electrostatic protection device, first flat board and the second that the bent angle both sides including the return bend set up relatively are dull and stereotyped, first flat board with form bent angle electric field between the second flat board, first flat board with connect DC power supply portion and slide rheostat electrically between the second flat board, slide rheostat can slide and change the size of bent angle electric field power.
In a preferred embodiment of the present invention, the first plate and the second plate are copper plates, the first plate is located inside the bend angle, and the second plate is located outside the bend angle.
The purpose of the utility model can be realized in such a way that the pneumatic conveying experiment system comprises a bent pipe, wherein the bent pipe comprises a first straight pipe part which is horizontally arranged and a second straight pipe part which is vertically arranged, and a bent angle is arranged between the first straight pipe part and the second straight pipe part for communication; the bend electrostatic protection device is arranged at the bend, the first straight pipe part is provided with a modular parameter current transformer capable of measuring particle charges in the bend, and the first straight pipe part is also provided with an induced current measuring part capable of measuring induced current in the bend; the inlet of the first straight pipe part is communicated with the outlet of an air-solid rotary valve, the inlet of the air-solid rotary valve is connected with a feeding part and an air inlet part, the feeding part is used for filling and conveying particles, the air inlet part is used for inputting compressed air, and the air-solid rotary valve is used for mixing air and solid phases; the outlet of the second straight pipe part can be communicated with the feeding part; the feeding part and the induction current measuring part are both grounded.
In a preferred embodiment of the present invention, the induced current measuring portion includes a guiding portion covering the first straight tube portion, the guiding portion is electrically connected to an electrostatic instrument for grounding processing, the electrostatic instrument is used for measuring the induced current of the bent tube, and the electrostatic instrument is electrically connected to a computer; the modular parametric current transformer is electrically connected with the computer.
In a preferred embodiment of the present invention, the guiding portion includes a first aluminum foil paper layer coated on the outer wall of the first straight pipe portion, the outer wall of the first aluminum foil paper layer is coated with a polymer film layer capable of insulating, and the outer wall of the polymer film layer is coated with a second aluminum foil paper layer; the first aluminum foil paper layer, the polymer film layer and the second aluminum foil paper layer are coaxially arranged, and the first aluminum foil paper layer, the polymer film layer and the second aluminum foil paper layer form a navigation system;
the first aluminum foil paper layer is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument; the second aluminum foil paper layer is electrically connected with a second lead, and the other end of the second lead is electrically connected with a low potential of the electrostatic instrument; and the second aluminum foil paper layer is subjected to grounding treatment.
The utility model discloses an in a preferred embodiment, the feed portion includes feeding recovery hopper, the hopper in the middle of feeding recovery hopper's export intercommunication sets up, the export of middle hopper passes through the feed control valve intercommunication the gas-solid rotary valve.
In a preferred embodiment of the present invention, the intermediate hopper is connected with an electronic weighing device.
The utility model discloses an in a preferred embodiment, the portion of admitting air includes the airflow control valve, the export intercommunication air flow dryer of airflow control valve, the export intercommunication of air flow dryer sets up the rotameter that can monitor air mass flow, rotameter's export intercommunication the gas-solid rotary valve.
From above, the utility model provides a return bend electrostatic protection device and pneumatic conveyor experimental system has following beneficial effect:
the utility model provides an among the return bend electrostatic protection device, through control slide rheostat size, make the electric field force that two flat boards produced equal with the electrostatic force that the transport granule receives, make transport granule atress balanced in the electric field, avoid carrying granule collision bend corner department lateral wall of return bend, reduce the wearing and tearing of return bend, effectively protect the return bend, improve the material transport efficiency of transport granule;
the pneumatic conveying experiment system provided by the utility model adopts the elbow electrostatic protection device, so that the stress of the conveying particles in an electric field is balanced, the conveying particles are prevented from colliding with the side wall of the elbow, the abrasion of the elbow is reduced, the elbow is effectively protected, and the material conveying efficiency of the conveying particles is improved; the utility model provides an it still sets up modularization parameter current transformer and induced-current measurement portion among the pneumatic conveying experimental system, can carry out real-time on-line measuring to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measurement process induced-current.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: do the utility model discloses a pneumatic conveying experimental system's schematic diagram.
FIG. 2: is a cross-sectional view taken at a-a in fig. 1.
In the figure:
100. a pneumatic conveying experiment system;
1. a bent pipe electrostatic protection device;
11. a first plate; 12. a second plate; 13. a DC power supply unit; 14. a slide rheostat;
2. bending the pipe;
20. bending the corner; 21. a first straight pipe portion; 22. a second straight tube portion;
3. a modular parametric current transformer;
4. an induced current measuring section;
41. a guide part;
411. a first aluminum foil paper layer; 412. a polymer film layer; 413. a second aluminum foil paper layer;
42. an electrostatic instrument;
43. a computer;
5. a gas-solid rotary valve;
6. a feeding section;
61. a feed recovery hopper; 62. an intermediate hopper; 63. a feed control valve; 64. an electronic weigher; 65. a feed back control valve;
7. an air intake portion;
71. an airflow control valve; 72. an air flow dryer; 73. a rotameter.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of explanation only and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the utility model provides an elbow electrostatic protection device 1, including relative first plate 11 and the second plate 12 that sets up in bent angle 20 both sides of elbow pipe 2, form bent angle electric field between first plate 11 and the second plate 12, connect dc power supply portion 13 and slide rheostat 14 between first plate 11 and the second plate 12 electrically, slide rheostat 14 can slide the size that changes bent angle electric field force.
The utility model provides an among the return bend electrostatic protection device, through control slide rheostat size for the electric field force that two flat boards produced equals with the electrostatic force size that the transport granule receives, makes transport granule atress balanced in the electric field, avoids carrying the bent angle department lateral wall of granule collision return bend, reduces the wearing and tearing of return bend, effectively protects the return bend, improves the material transport efficiency who carries the granule.
Further, the first plate 11 and the second plate 12 are both copper plates, the first plate 11 is located on the inner side of the corner, and the second plate 12 is located on the outer side of the corner.
As shown in fig. 1, the present invention further provides a pneumatic conveying experimental system 100, which includes an elbow pipe 2 (in this embodiment, the elbow pipe 2 is a polyvinyl chloride pipe, i.e. a PVC pipe), the elbow pipe 2 includes a first horizontal straight pipe portion 21 and a second vertical straight pipe portion 22 which are communicated with each other, and a corner 20 is provided between the first straight pipe portion 21 and the second straight pipe portion 22 for communication; in a specific embodiment of the present invention, the inner diameter of the elbow pipe 2 is 40mm, the angle of the elbow angle 20 is 90 °, the first straight pipe portion 21 is horizontally disposed, the length thereof is 4.12m, the second straight pipe portion 22 is vertically disposed, the length thereof is 2.97m, the elbow pipe 2 is transparent, the state in the pipe can be directly observed, the material of the elbow pipe 2 is polyvinyl chloride, and the thickness of the pipe wall is 5 mm. The various sections of the tubing are joined together, supported on each other, and the connections between the tubing are reinforced with a silicone gel.
The bend electrostatic protection device 1 is arranged at the bend 20, the modular parameter current transformer 3 capable of measuring particle charges in the bend is arranged at the first straight pipe part 21, the modular parameter current transformer 3 measures induced current by using a non-invasive current beam, and the measurement accuracy can reach 1 muA. The modular parametric current transformer 3 is mounted on a first straight pipe section 21 (horizontal pipe) and when transport particles carrying an electric charge pass the modular parametric current transformer 3 in the pipe, an electrostatic reading is generated.
An induced current measuring part 4 capable of measuring the induced current in the elbow pipe 2 is also arranged at the first straight pipe part 21; the inlet of the first straight pipe part 21 is communicated with the outlet of an air-solid rotary valve 5, the inlet of the air-solid rotary valve 5 is connected with a feeding part 6 and an air inlet part 7, the feeding part 6 is used for filling and conveying particles, the air inlet part 7 is used for inputting compressed air, and the air-solid rotary valve 5 is used for mixing air and solid phases; the outlet of the second straight tube portion 22 can communicate with the feed portion; the feeding portion 6 and the induced current measuring portion 4 are grounded. Except that the bent pipe 2 adopts a polyvinyl chloride (PVC) pipe, the conveying pipes among other parts are all formed by copper pipes.
The pneumatic conveying experiment system provided by the utility model adopts the elbow electrostatic protection device, so that the stress of the conveying particles in an electric field is balanced, the conveying particles are prevented from colliding with the side wall of the elbow, the abrasion of the elbow is reduced, the elbow is effectively protected, and the material conveying efficiency of the conveying particles is improved; the utility model provides an it still sets up modularization parameter current transformer and induced-current measurement portion among the pneumatic conveying experimental system, can carry out real-time on-line measuring to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measurement process induced-current.
Further, the induced current measuring part 4 comprises a guiding part 41 coated on the first straight pipe part 21, the guiding part 41 is electrically connected to an electrostatic instrument 42 for grounding treatment, the electrostatic instrument 42 is used for measuring the induced current of the bent pipe 2, and the electrostatic instrument 42 is electrically connected to a computer 43; the modular parametric current transformer 3 is electrically connected to a computer 43.
Further, as shown in fig. 2, the guiding portion 41 includes a first aluminum foil layer 411 covering the outer wall of the first straight pipe portion 21, a polymer film layer 412 capable of insulating is covered on the outer wall of the first aluminum foil layer 411, and a second aluminum foil layer 413 is covered on the outer wall of the polymer film layer 412; the first aluminum foil paper layer 411, the polymer film layer 412 and the second aluminum foil paper layer 413 are coaxially arranged, and the first aluminum foil paper layer 411, the polymer film layer 412 and the second aluminum foil paper layer 413 form a navigation system;
the first aluminum foil paper layer 411 is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument 42; the second aluminum foil paper layer 413 is electrically connected with a second lead, and the other end of the second lead is electrically connected with the low potential of the electrostatic instrument 42; the second aluminum foil paper layer 413 is grounded for protecting the electric appliance.
An electromagnetic field is limited between the first aluminum foil paper layer 411 and the second aluminum foil paper layer 413, the coaxial line basically has no radiation loss, is hardly interfered by external signals, and effectively shields the influence of the outside on the measurement of electrostatic signals; the first aluminum foil layer 411 and the second aluminum foil layer 413 are both continuously conductive, so that the collection work of the induced current can be well completed; the second aluminum foil paper layer 413 is grounded, so that the electromagnetic shielding effect is achieved, the whole induced current measuring part 4 is high in anti-interference capacity and good in shielding performance, a stable electromagnetic field is maintained inside all the time, induced current transmission is more stable, and the measuring accuracy is improved.
Further, as shown in fig. 1, the feeding part 6 comprises a feeding recovery hopper 61, an outlet of the feeding recovery hopper 61 is communicated with an intermediate hopper 62, an outlet of the intermediate hopper 62 is communicated with the gas-solid rotary valve 5 through a feeding control valve 63, and the feeding control valve 63 can control the flow rate of the particles conveyed by the intermediate hopper 62; the outlet of the second straight pipe portion 22 can communicate with a feed recovery hopper 61 through a delivery straight pipe, and a return control valve 65 is provided between the feed recovery hopper 61 and the intermediate hopper 62.
As shown in fig. 1, in the present embodiment, an electronic scale 64 is connected to the intermediate hopper 62.
Further, as shown in fig. 1, the air inlet portion 7 includes an airflow control valve 71, an outlet of the airflow control valve 71 is communicated with an airflow dryer 72, an outlet of the airflow dryer 72 is communicated with a rotameter 73 capable of monitoring the air flow, and an outlet of the rotameter 73 is communicated with the gas-solid rotary valve 5. The stream humidity was controlled at relative humidity (RH ═ 5% in one embodiment) by a stream dryer 72 (blue silica gel) and examined before and after each experiment using a high performance digital hygrothermograph (which may be RH411 from omega technologies, inc.).
The utility model discloses an experimental method of pneumatic conveying experimental system 100, including following step:
step a, opening an airflow control valve 71, drying compressed air (air pressure 75psi) by an airflow dryer 72, and monitoring the flow rate of the compressed air by a rotor flow meter 73;
step b, when the flow rate of the compressed air reaches a set flow rate value, opening the intermediate hopper 62, controlling the quality of the conveyed particles through the electronic weigher 64, and controlling the speed of the conveyed particles through the feeding control valve 63;
c, mixing the compressed air and the conveying particles in the gas-solid rotary valve 5 to form a gas-solid two-phase flow;
step d, when the gas-solid two-phase flow passes through the bent pipe, the modularized parameter current transformer 3 measures the particle charge in the bent pipe, the static electricity meter 42 measures the induced current, and the induced current is stored in the computer 43 at a set time interval (in a specific embodiment, the time interval is 0.5 s);
step e, controlling the slide rheostat 14 according to the induced current to enable the electric field force generated between the first flat plate 11 and the second flat plate 12 to be equal to the electrostatic force borne by the conveyed particles, so that the force of the conveyed particles in the electric field is balanced;
and f, returning and collecting the conveyed particles to the feeding recovery hopper 61, and discharging after finishing.
From above, the utility model provides a return bend electrostatic protection device and pneumatic conveyor experimental system has following beneficial effect:
the utility model provides an among the return bend electrostatic protection device, through control slide rheostat size, make the electric field force that two flat boards produced equal with the electrostatic force that the transport granule receives, make transport granule atress balanced in the electric field, avoid carrying granule collision bend corner department lateral wall of return bend, reduce the wearing and tearing of return bend, effectively protect the return bend, improve the material transport efficiency of transport granule;
the pneumatic conveying experiment system provided by the utility model adopts the elbow electrostatic protection device, so that the stress of the conveying particles in an electric field is balanced, the conveying particles are prevented from colliding with the side wall of the elbow, the abrasion of the elbow is reduced, the elbow is effectively protected, and the material conveying efficiency of the conveying particles is improved; the utility model provides an it still sets up modularization parameter current transformer and induced-current measurement portion among the pneumatic conveying experimental system, can carry out real-time on-line measuring to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measurement process induced-current.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (8)

1. The electrostatic protection device for the elbow is characterized by comprising a first flat plate and a second flat plate which are oppositely arranged on two sides of an elbow of the elbow, wherein an elbow electric field is formed between the first flat plate and the second flat plate, a direct-current power supply part and a slide rheostat are electrically connected between the first flat plate and the second flat plate, and the slide rheostat can change the magnitude of the elbow electric field force in a sliding manner.
2. The elbow electrostatic protection device of claim 1, wherein the first plate and the second plate are each copper plates, the first plate being located inside the corner piece and the second plate being located outside the corner piece.
3. A pneumatic transmission experiment system is characterized by comprising an elbow, wherein the elbow comprises a first straight pipe part and a second straight pipe part, the first straight pipe part and the second straight pipe part are horizontally arranged, and a bend angle is arranged between the first straight pipe part and the second straight pipe part for communication; the elbow static protection device according to claim 1 or 2 is arranged at the corner, a modular parameter current transformer capable of measuring the particle charge in the elbow is arranged at the first straight pipe part, and an induced current measuring part capable of measuring the induced current in the elbow is further arranged at the first straight pipe part; the inlet of the first straight pipe part is communicated with the outlet of an air-solid rotary valve, the inlet of the air-solid rotary valve is connected with a feeding part and an air inlet part, the feeding part is used for filling and conveying particles, the air inlet part is used for inputting compressed air, and the air-solid rotary valve is used for mixing air and solid phases; the outlet of the second straight pipe part can be communicated with the feeding part; the feeding part and the induction current measuring part are both grounded.
4. The pneumatic conveying experimental system according to claim 3, wherein the induced current measuring portion comprises a guiding portion wrapped on the first straight pipe portion, the guiding portion is electrically connected to an electrostatic instrument with grounding treatment, the electrostatic instrument is used for measuring the induced current of the bent pipe, and the electrostatic instrument is electrically connected to a computer; the modular parametric current transformer is electrically connected with the computer.
5. The pneumatic conveying experimental system of claim 4, wherein the guiding portion comprises a first aluminum foil paper layer coated on an outer wall of the first straight pipe portion, an insulating polymer film layer is coated on an outer wall of the first aluminum foil paper layer, and a second aluminum foil paper layer is coated on an outer wall of the polymer film layer; the first aluminum foil paper layer, the polymer film layer and the second aluminum foil paper layer are coaxially arranged, and the first aluminum foil paper layer, the polymer film layer and the second aluminum foil paper layer form a navigation system;
the first aluminum foil paper layer is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument; the second aluminum foil paper layer is electrically connected with a second lead, and the other end of the second lead is electrically connected with a low potential of the electrostatic instrument; and the second aluminum foil paper layer is subjected to grounding treatment.
6. The pneumatic conveying experimental system as claimed in claim 5, wherein the feeding part comprises a feeding recovery hopper, an outlet of the feeding recovery hopper is communicated with an intermediate hopper, and an outlet of the intermediate hopper is communicated with the gas-solid rotary valve through a feeding control valve.
7. The pneumatic conveying experiment system according to claim 6, wherein an electronic weigher is connected to the intermediate hopper.
8. The pneumatic conveying experimental system according to claim 7, wherein the air inlet portion comprises an airflow control valve, an outlet of the airflow control valve is communicated with an airflow dryer, an outlet of the airflow dryer is communicated with a rotameter capable of monitoring air flow, and an outlet of the rotameter is communicated with the gas-solid rotary valve.
CN201920840610.0U 2019-06-05 2019-06-05 Elbow electrostatic protection device and pneumatic conveying experiment system Withdrawn - After Issue CN210392925U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920840610.0U CN210392925U (en) 2019-06-05 2019-06-05 Elbow electrostatic protection device and pneumatic conveying experiment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920840610.0U CN210392925U (en) 2019-06-05 2019-06-05 Elbow electrostatic protection device and pneumatic conveying experiment system

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Publication Number Publication Date
CN210392925U true CN210392925U (en) 2020-04-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110203701A (en) * 2019-06-05 2019-09-06 中国石油大学(北京) Bend pipe electrostatic protection apparatus, pneumatic conveying experimental system and experimental method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110203701A (en) * 2019-06-05 2019-09-06 中国石油大学(北京) Bend pipe electrostatic protection apparatus, pneumatic conveying experimental system and experimental method
CN110203701B (en) * 2019-06-05 2024-05-17 中国石油大学(北京) Bent pipe electrostatic protection device, pneumatic conveying experiment system and experiment method

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