CN115196349B - Method and device for removing static electricity for powder pneumatic conveying system - Google Patents
Method and device for removing static electricity for powder pneumatic conveying system Download PDFInfo
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- CN115196349B CN115196349B CN202210857498.8A CN202210857498A CN115196349B CN 115196349 B CN115196349 B CN 115196349B CN 202210857498 A CN202210857498 A CN 202210857498A CN 115196349 B CN115196349 B CN 115196349B
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- static electricity
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- conveying pipeline
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- 239000000843 powder Substances 0.000 title claims abstract description 117
- 230000003068 static effect Effects 0.000 title claims abstract description 92
- 230000005611 electricity Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 104
- 239000002245 particle Substances 0.000 claims abstract description 55
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 44
- 239000000523 sample Substances 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000008030 elimination Effects 0.000 abstract 2
- 238000003379 elimination reaction Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 7
- 238000006386 neutralization reaction Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000010892 electric spark Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004924 electrostatic deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- B65G53/50—Pneumatic devices
-
- 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
- B65G53/58—Devices for accelerating or decelerating flow of the materials; Use of pressure generators
-
- 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
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/06—Carrying-off electrostatic charges by means of ionising radiation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The utility model provides a method and a device for removing static electricity for a powder pneumatic conveying system, which relate to the field of pneumatic conveying, wherein static electricity generated by powder particles in the pneumatic conveying system is removed by utilizing an ion wind coupling grounding metal pipe, the powder particles provided by a feeding device are conveyed into a pneumatic conveying pipeline by conveying wind of a conveying wind feeding device, the powder particles are sequentially conveyed to a receiving device through the ion wind feeding device and the grounding metal pipe device, and the powder particles realize electricity removal under the action of the ion wind and the grounding metal pipe. The utility model effectively realizes the static elimination of powder particles in the pneumatic conveying process, and realizes the linkage of two methods by feeding back the ion wind supply device by the powder static voltage measured at the front part of the grounded metal pipe, and the ion wind supply device is arranged at the front part of the grounded metal pipe, thereby reducing the influence caused by excessive or insufficient ion wind, increasing the electricity elimination efficiency, reducing the energy consumption and maintaining the static safety.
Description
Technical Field
The utility model relates to the technical field of pneumatic conveying, in particular to a static electricity removing method and device for a powder pneumatic conveying system.
Background
Pneumatic conveying is a method for conveying solid particles in a pipeline by utilizing airflow, and the technology has a long history, and nowadays, because of the simple circuit and low maintenance cost, the pneumatic conveying has wide application in the process of conveying different types of solid particles. However, during the pneumatic transport of powder particles, obvious electrostatic electrification phenomena may occur due to collisions and friction between the powder particles and the transport pipe, and even explosion and fire may occur as a result. Therefore, it is necessary to reduce the generation of static electricity during pneumatic transportation. The method for reducing the static electricity generated by particles through pneumatic conveying in the market mainly comprises the steps of blowing ion wind and grounding by utilizing a metal pipe, wherein the method of simply blowing ion wind is easy to cause excessive or insufficient neutralization charge, and the method has a counter effect; when the powder particles pass through the metal pipe in the pneumatic conveying pipeline by utilizing the grounding method of the metal pipe, when the powder voltage is large enough, the powder particles are easy to generate an electric spark phenomenon with the metal pipe, and when the powder flow is large enough, the powder particles are difficult to fully contact with the metal pipe wall, so that the static electricity removal amount is small, and the effect is not obvious.
The patent CN208932525U proposes a pneumatic conveying system with antistatic function, which changes the air source point required by pneumatic conveying into a single filter, and arranges the filter above a centrifugal mother liquor pool, wherein the air source is air above the centrifugal mother liquor pool, increases the humidity of the air in pneumatic conveying, and adds a water spray head in a pneumatic conveying pipeline to humidify the air, thereby preventing electrostatic deposition. Although the method can greatly reduce static electricity generated in pneumatic conveying, the method for increasing relative humidity in a pneumatic conveying pipeline is easy to cause accumulation and viscosity of powder particles and influence flowability.
The patent CN109142900A proposes an online monitoring and eliminating control system for static electricity of air-fed powder, which measures the space charge density of powder particles by using a rod ball sensor method, and controls the charge amount of ion wind by using a PLC control cabinet through the measured charge density.
In view of the above, there is still a lack of a method for pneumatic conveying systems, which can achieve simple measurement, stable static removal and less influence on the flowability of powder particles.
Disclosure of Invention
The utility model aims to provide a static electricity removing method and device for a powder pneumatic conveying system, which solve the problem of static electricity generated by collision of powder particles in the pneumatic conveying process by adopting a mode of coupling ionic wind and a metal grounding pipe in a linkage way, and have small influence on the flowability of the powder particles.
In order to achieve the above purpose, the present utility model proposes the following technical scheme: the method for removing static electricity in the powder pneumatic conveying system adopts an ion wind neutralization and static electricity removal method for removing static electricity by contacting a grounded metal pipe, and the method comprises the following steps:
the powder particles are conveyed into a pneumatic conveying pipeline by the air conveying and supplying air, and the powder particles are neutralized and removed by ion wind in the pneumatic conveying pipeline to be contacted with a grounded metal pipe to remove static electricity; the ion wind is in a closed state in the initial state, and the grounding metal pipe is in a power-on running state in the initial state;
measuring the electrostatic voltage of powder particles in the pneumatic conveying pipeline before the powder particles are contacted with a grounded metal pipe to remove static electricity; when the electrostatic voltage of the powder exceeds a preset voltage safety value, a first signal is fed back to the control center so that the control center can control the starting of the ion wind and control the charge and the wind quantity of the ion wind; when the electrostatic voltage of the powder is lower than a preset voltage safety value, feeding back a second signal to the control center so that the control center can control the ion wind to be closed;
measuring the air speed of a main pipe section of the pneumatic conveying pipeline and the air speed of an ion wind source respectively; when the wind speed of the main pipe section is not lower than the wind speed of the ion wind source, a third signal is fed back to the control center, so that the control center can control the wind speed of the ion wind source to be always higher than the wind speed of the main pipe.
Further, the voltage safety value is 1/4 to 3/4 of the electrostatic voltage value of the electrostatic spark phenomenon of the powder particles.
Further, when the measured electrostatic voltage of the powder exceeds a preset voltage safety value and continues to rise, a fourth signal is fed back to the control center so that the control center can control the charge of the ion wind to be increased.
Furthermore, the total air quantity of the ion air does not exceed one tenth of the main air quantity of the pneumatic conveying pipeline.
Further, defining the ion wind supply inlet on the pneumatic conveying pipeline as the first position and the grounded metal pipe inlet as the second position, and determining the distance L between the measuring point of the electrostatic voltage of the powder and the first position 1 Not less than 5D, the distance L between the measuring point of the electrostatic voltage of the powder and the second position 2 And the diameter of the main pipeline of the pneumatic conveying pipeline is less than or equal to 10D.
Further, the ion wind spraying direction in the pneumatic conveying pipeline is in the same direction as the flowing direction of the pneumatic conveying powder, and an included angle between the axis of the ion wind spraying direction and the axis of the pneumatic conveying pipeline is 30-60 degrees.
The utility model further discloses a static electricity removing device for a powder pneumatic conveying system, which comprises a pneumatic conveying pipeline, a feeding device, a conveying wind supply device, an ion wind supply device, a grounding metal pipe device, a receiving device, an online wind speed instrument and a static electricity measuring device, and a control center for controlling and connecting the conveying wind supply device, the ion wind supply device, the grounding metal pipe device, the online wind speed instrument and the static electricity measuring device;
the conveying wind supply device and the feeding device are sequentially arranged at the inlet end of the pneumatic conveying pipeline, the receiving device is arranged at the outlet end of the pneumatic conveying pipeline, and the conveying wind supply device is used for conveying powder particles provided by the feeding device to the receiving device at the outlet end of the pneumatic conveying pipeline; the ion wind supply device and the grounding metal pipe device are both arranged on the pneumatic conveying pipeline, the ion wind supply device is used for conveying ion wind into the pneumatic conveying pipeline, the grounding metal pipe device is used for releasing charges for powder particles flowing through, and the ion wind supply device is arranged at the front section of the grounding metal pipe device;
the on-line wind speed instrument is respectively arranged at the inlet end of the pneumatic conveying pipeline and the outlet end of the ion wind supply device and is used for respectively measuring the wind speed of a main pipe section of the pneumatic conveying pipeline and the wind speed of an ion wind source of the ion wind supply device; the electrostatic measuring device is communicated to the inner side of the pneumatic conveying pipeline and is used for measuring the electrostatic voltage of the powder after passing through the ion wind device and before entering the grounded metal pipe device;
the control center controls the ion wind source wind speed to be larger than the main pipe section wind speed according to the measurement data of the online wind speed instrument;
a voltage safety value is preset in the control center; when the measurement data of the static measurement device exceeds a voltage safety value, the control center controls the ion wind supply device to be started, and simultaneously controls the voltage and the wind speed of the ion wind supply device; and when the measured data of the static measuring device is lower than a voltage safety value, the control center controls the ion wind supply device to be closed.
Further, the ion wind supply device comprises a plurality of ion wind spray heads, a positive-pressure direct-current power supply, a negative-pressure direct-current power supply, two first insulating flanges, an air compressor and an electromagnetic valve;
the two first insulating flanges are arranged at intervals along the extending direction of the pneumatic conveying pipeline, and an ion wind spray head mounting area is formed between the two first insulating flanges;
the ion wind spray heads are arranged in an array along the extending direction of the pneumatic conveying pipeline in the ion wind spray head mounting area, and the ion wind spray heads are communicated into the pneumatic conveying pipeline along a tangential air inlet angle; the air pipe interface of the input end of the ion air spray head is communicated to the air compressor by adopting an air pipe, and the electromagnetic valve is arranged on the air pipe; the electromagnetic valve is connected with the control center in a control way, and the opening degree of the electromagnetic valve controls the wind speed of the ion wind source; the power interface of the ion wind spray head is connected with the output ends of the positive-voltage direct-current power supply and the negative-voltage direct-current power supply respectively by adopting wires, and the input ends of the positive-voltage direct-current power supply and the negative-voltage direct-current power supply are connected to the signal output end of the control center respectively.
Further, the grounding metal tube device comprises a metal tube, a grounding wire and two second insulating flanges;
two ends of the metal pipe are connected into the pneumatic conveying pipeline along the extending direction of the pneumatic conveying pipeline by adopting two second insulating flanges, and the metal pipe is connected with a grounding wire.
Further, the electrostatic measuring device is arranged at the middle pipe sections of the ion wind supply device and the grounding metal pipe device and comprises a metal probe, an insulating support piece, a collector plate and an electrostatic instrument provided with an instrument measuring probe and a digital acquisition module; one end of the metal probe extends into the metal pipe section, and the metal probe and the metal pipe wall are supported and fixed by the insulating support piece; the input end of the collector plate is connected with the metal probe through a wire, and the position of the instrument measuring probe of the electrostatic instrument corresponds to the collector plate; the static electricity meter is used for measuring the electric potential on the collector plate and outputting a digital signal to the control center.
Further, the ion wind spray head comprises a spray head shell, a needle electrode and a circuit board; one end of the nozzle shell is provided with an ion wind air inlet, the other end of the nozzle shell is provided with an ion wind outlet, one end of the needle electrode stretches into the interior of the nozzle shell, the other end of the needle electrode is fixedly supported by the nozzle shell through the circuit board, the needle electrode is used for providing positive and negative charges so as to enable the needle electrode to enter gas molecules in the interior of the ion wind nozzle shell through the ion wind air inlet to capture the positive and negative charges to form ion wind, and the ion wind is sprayed into the pneumatic conveying pipeline through the ion wind outlet.
Further, the ion wind supply device and the grounded metal pipe device are in one-to-one correspondence to form static removing units on the pneumatic conveying pipeline, and the static removing units are arranged in an array in the extending direction of the pneumatic conveying pipeline.
According to the technical scheme, the following beneficial effects are achieved:
1) The static electricity removing method and the static electricity removing device for the powder pneumatic conveying system provided by the utility model remove static electricity through the two methods of the ion wind and the grounded metal pipe, are safe and efficient, reduce adhesion and accumulation, and have obvious effects.
2) The static electricity removing method and the static electricity removing device for the powder pneumatic conveying system provided by the utility model remove static electricity through the ion wind and the grounded metal pipe, solve the problem that the traditional ion wind device is easy to cause excessive or insufficient static electricity removing, and solve the problem that the traditional metal pipe grounding device is difficult to contact with partial powder particles flowing through when the powder charging voltage is large enough and the problem that the static electricity removing effect is not obvious when the powder charging voltage is large enough and the metal pipe is contacted with the powder charging voltage is large.
3) The method and the device for removing static electricity for the powder pneumatic conveying system provided by the utility model feed back signals to the control center through measuring the static voltage and the air quantity of the powder in the pneumatic conveying pipeline, and then the control center sends out instructions to control the starting and stopping of the ion air supply device and the opening of the electromagnetic valve on the ion air supply device, thereby reducing energy consumption and increasing the fault tolerance of static electricity removal.
4) According to the static removing method and device for the powder pneumatic conveying system, the ion wind enters the pneumatic conveying pipeline in a tangential air inlet rotational flow mode, so that the contact between powder particles and the ion wind is increased, and meanwhile, the accumulated powder particles are purged, so that the fluidity is increased.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the utility model, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the utility model.
Drawings
The drawings are not intended to be drawn to scale with respect to true references. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a static electricity removing device for a powder pneumatic conveying system according to an embodiment of the present utility model;
FIG. 2 is a schematic view of an ion wind supply device according to an embodiment of the present utility model;
FIG. 3 is a flow chart illustrating the internal rotation of an ion wind supply pipe according to an embodiment of the present utility model;
FIG. 4 is a schematic view of a moving track of charged particles in a metal tube according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of the principle of ion wind formation in an ion wind spray head according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of an electrostatic measuring device according to an embodiment of the utility model.
In the drawings, the meanings of the reference numerals are as follows:
1-Roots blower; 2-a pressure stabilizing air storage tank; 3-an exhaust safety valve; 4-stop valve; 5-a gas flow meter; 6-a feeding cylinder; 7-a feed valve; 8-an air compressor; 9-an electromagnetic valve; 10-positive voltage direct current power supply; 11-negative-pressure direct-current power supply; 12, a control center; 13-a metal tube; 14-grounding wire; 15-a cyclone device; 16-bin; 17-an online wind speed meter; 21-an insulating flange; 22-ion wind spray head; 23-an air pipe joint; 24-a power interface; 25-a circuit board; 26-needle electrode; 27-gas molecules; 28-charge; 29-a metal probe; 30-insulating supports; 31-collector plates; 32-an instrument measurement probe; 33-electrostatic meter; 34-a digital acquisition module; 41-ion wind supply device; 42-grounded metal tubing means; 43-electrostatic measuring device; 111-an air inlet; 112-a feed inlet; 113-an exhaust port; 114-an ion wind inlet; 115-ion wind ejection port.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
Based on the prior art, in the process of conveying powder particles by a pneumatic conveying system, obvious electrostatic electrification phenomenon can be generated due to collision and friction between the powder particles and a conveying pipeline, and the risk of explosion and fire is caused; the two schemes of blowing ion wind and grounding by utilizing a metal pipe in the current market have obvious defects, such as the defect that the method of blowing ion wind easily causes excessive or insufficient neutralization charge, and the method of grounding by utilizing the metal pipe has the defects of potential safety hazard, small static electricity removal amount and unobvious effect. Based on the problems, the utility model adopts the mode of coupling the ion wind with the grounded metal pipe to eliminate electricity, and feeds back the ion wind device through the powder voltage measured at the grounded metal pipe, thereby realizing linkage of two methods and ensuring electrostatic safety.
The utility model discloses a method and a device for removing static electricity for a powder pneumatic conveying system, which are further specifically described below with reference to the specific embodiments shown in the drawings.
In order to solve the problems that a powder pneumatic conveying system in the prior art cannot realize stable static electricity removal and does not influence powder flowability, the method for removing static electricity generated by powder particles in the pneumatic conveying system by utilizing an ion wind coupling grounding metal pipe is designed.
As shown in fig. 1, the utility model provides an electrostatic removing device for a powder pneumatic conveying system, which comprises a pneumatic conveying pipeline, a feeding device, a conveying wind supply device, an ion wind supply device 41, a grounding metal pipe device 42, a material receiving device, an online wind speed instrument 17, an electrostatic measuring device 43 and a control center 12, wherein the control center 12 is respectively connected with the conveying wind supply device, the ion wind supply device 41, the grounding metal pipe device 42, the online wind speed instrument 17 and the electrostatic measuring device 43 in a control manner;
as shown in the figure, the conveying wind supply device and the feeding device are sequentially arranged at the inlet end of the pneumatic conveying pipeline, the receiving device is arranged at the outlet end of the pneumatic conveying pipeline, and the conveying wind supply device is used for conveying powder particles provided by the feeding device to the receiving device at the outlet end of the pneumatic conveying pipeline; the ion wind supply device 41 and the grounding metal pipe device 42 are both arranged on the pneumatic conveying pipeline, the ion wind supply device 41 is used for conveying ion wind into the pneumatic conveying pipeline, the grounding metal pipe device 42 is used for releasing charges for powder particles flowing through the pneumatic conveying pipeline, and the ion wind supply device 41 is arranged at the front section of the grounding metal pipe device 42; the online wind speed instrument 17 is respectively arranged at the inlet end of the pneumatic conveying pipeline and the outlet end of the ion wind supply device 41 and is used for respectively measuring the wind speed of the main pipe section of the pneumatic conveying pipeline and the wind speed of the ion wind source of the ion wind supply device 41; the electrostatic measuring device 43 is communicated to the inner side of the pneumatic conveying pipeline and is used for measuring the electrostatic voltage of the powder after passing through the ion wind supplying device 41 and before entering the grounding metal pipe device 42;
the control center 12 controls the air source wind speed of the ion wind to be larger than the wind speed of the main pipe section according to the measurement data of the online wind speed instrument 17; on the other hand, a voltage safety value is preset in the control center 12; when the measurement data of the electrostatic measuring device 43 exceeds the voltage safety value, the control center 12 controls the ion wind supply device 41 to be started, and simultaneously controls the voltage and the wind speed of the ion wind supply device 41; when the measurement data of the electrostatic measurement device 43 is lower than the voltage safety value, the control center 12 controls to turn off the ion wind supply device 41.
Further referring to fig. 1, the feeding device comprises a feeding cylinder 6, a feeding valve 7 and a feeding port 112, wherein the feeding port 112 is arranged at the starting position of the pneumatic conveying pipeline and is connected with an air inlet 111 of the pneumatic conveying pipeline, and the air inlet 111 is connected with a conveying air supply device; the conveying wind supply device comprises a Roots blower 1, a pressure-stabilizing air storage tank 2, an exhaust safety valve 3, a stop valve 4 and a gas flowmeter 5, wherein the Roots blower provides power for the whole pneumatic conveying pipeline 1, the pressure-stabilizing air storage tank 2 stores gas provided by the Roots blower 1, the stop valve 4 controls the flow of conveying wind, the gas flowmeter 5 measures the flow of conveying wind, and the exhaust safety valve 4 ensures the safety of the whole system. The material receiving device comprises a cyclone device 15 and a storage bin 16 which are sequentially arranged at the tail end of the pneumatic conveying pipeline, and an exhaust port 113 is arranged at the upper part of the cyclone device 15.
As shown in fig. 1 and 2, the ion wind supply device 41 includes a plurality of ion wind spray heads 22, a positive voltage direct current power supply 10, a negative voltage direct current power supply 11, two first insulating flanges, an air compressor 8 and an electromagnetic valve 9; as shown in the figure, two first insulating flanges are arranged at intervals along the extending direction of the pneumatic conveying pipeline, and an ion wind spray head mounting area is formed between the two first insulating flanges; the ion wind spray heads 22 are arranged in an array along the extending direction of the pneumatic conveying pipeline in the ion wind spray head installation area, and the ion wind spray heads 22 are communicated into the pneumatic conveying pipeline along the tangential air inlet angle. When in use, the air pipe interface 23 at the input end of the ion air spray head 22 is communicated to the air compressor 8 by adopting an air pipe, the electromagnetic valve 9 is arranged on the air pipe, the electromagnetic valve 9 is controlled and connected with the control center 12, and the opening of the electromagnetic valve controls the air speed of the ion air source; the power interface 24 of the ion wind spray head 22 is respectively connected with the output ends of the positive-voltage direct-current power supply 10 and the negative-voltage direct-current power supply 11 by adopting wires, and the input ends of the positive-voltage direct-current power supply 10 and the negative-voltage direct-current power supply 11 are respectively connected with the signal output ends of the control center 12; the positive voltage direct current power supply 10 and the negative voltage direct current power supply 11 provide positive and negative charges for the ion wind, and the voltage determines the quantity of the charges.
As shown in fig. 5, the ion wind spray head 22 comprises a spray head shell, a needle electrode 26 and a circuit board 25, wherein one end of the spray head shell is provided with an ion wind inlet 114, the other end of the spray head shell is provided with an ion wind spray outlet 115, one end of the needle electrode 26 extends into the spray head shell, the other end of the needle electrode is supported and fixed with the spray head shell through the circuit board 25, and the circuit board 25 is electrically connected with a power interface 24 of the ion wind spray head 22; the needle electrode 26 is used for providing positive and negative charges, and when the gas source is used for introducing gas into the ion wind spray head 22 through the ion wind air inlet 114, the positive and negative charges 28 are captured by the gas molecules 27 of the gas in the ion wind spray head 22 to form ion wind, and the ion wind is sprayed into the pneumatic conveying pipeline through the ion wind spray outlet 115.
In specific implementation, the spraying direction of the ion wind spray head 22 on the ion wind spray head installation area is the same as the pneumatic conveying flow direction, and the included angle between the axis of the ion wind spray head 22 and the axis of a pneumatic conveying pipeline installed by the ion wind spray head is 30-60 degrees; the ion wind enters the pneumatic conveying pipeline in a tangential air inlet mode, and forms rotational flow in the pneumatic conveying pipeline under the condition that the air speed of the ion wind source is larger than that of the main pipe section, as shown in fig. 3, the ion wind is fully contacted with powder particles, and meanwhile powder particles accumulated in the pipeline are purged, so that the fluidity of the powder particles is increased.
As shown in connection with fig. 1 and 4, the grounded metal pipe device 42 comprises a metal pipe 13, a ground wire 14 and two second insulating flanges; as shown in the figure, two second insulating flanges are adopted at two ends of the metal tube 13 to be connected into the pneumatic conveying pipeline along the extending direction of the pneumatic conveying pipeline, and the metal tube 13 is connected with a grounding wire 14 so that the flowing powder particles are contacted with the wall surface of the metal tube 13 to release charges. In a specific application, the first insulating flange and the second insulating flange may be the same insulating flange 21 or may be different.
In this embodiment, the grounded metal pipe device 42 is coupled to the ion wind supply device 41 in a linkage manner, specifically, the electrostatic measurement device 43 monitors the electrostatic voltage of the powder particles before entering the metal pipe 13 to determine whether to activate the ion wind supply device 41.
As shown in fig. 6, the electrostatic measuring device 43 is provided at the middle pipe section of the ion wind supplying device 41 and the grounded metal pipe device 42, and includes a metal probe 29, an insulating support 30, a collector plate 31, and an electrostatic meter 33 provided with a meter measuring probe 32 and a digital acquisition module 34; when in assembly, one end of the metal probe 29 extends into the pipe section of the metal pipe 13, and is supported and fixed with the pipe wall of the metal pipe 13 through the insulating support 30; the input end of the collector plate 31 is connected with the metal probe 29 through a wire, and the position of the meter measuring probe 32 of the electrostatic meter 33 corresponds to the collector plate 31; the electrostatic meter 33 is used for measuring the electric potential on the collector plate 31, inputting the electric signal to the digital acquisition module 34, and the digital acquisition module 34 converts the electric signal into a digital signal and outputs the digital signal to the control center 12.
In some embodiments, to ensure the static electricity eliminating effect, the ion wind supplying device 41 and the grounding metal pipe device 42 are in one-to-one correspondence to form static electricity eliminating units on the pneumatic conveying pipeline, and the static electricity eliminating units are arrayed in the extending direction of the pneumatic conveying pipeline; that is, when the length of the pneumatic conveying pipe is sufficient, the ion wind supply device 41 and the grounding metal pipe device 42 may be provided in plural in the pipe.
The utility model further provides a static electricity removing method for a powder pneumatic conveying system, which adopts an ion wind neutralization static electricity removing method for removing static electricity generated by powder particles in the pneumatic conveying system by contacting a grounded metal pipe, and specifically comprises the following steps:
the powder particles are conveyed into a pneumatic conveying pipeline by the air conveying and supplying air, and the powder particles are neutralized and removed by ion wind in the pneumatic conveying pipeline to be contacted with a grounded metal pipe to remove static electricity; the ion wind is in a closed state in the initial state, and the grounding metal pipe is in a power-on running state in the initial state;
measuring the electrostatic voltage of powder particles in the pneumatic conveying pipeline before the powder particles are contacted with a grounded metal pipe to remove static electricity; when the electrostatic voltage of the powder exceeds a preset voltage safety value, a first signal is fed back to the control center so that the control center can control the starting of the ion wind and control the charge and the wind quantity of the ion wind; when the electrostatic voltage of the powder is lower than a preset voltage safety value, feeding back a second signal to the control center so that the control center can control the ion wind to be closed;
measuring the air speed of a main pipe section of the pneumatic conveying pipeline and the air speed of an ion wind source respectively; when the wind speed of the main pipe section is not lower than the wind speed of the ion wind source, a third signal is fed back to the control center, so that the control center can control the wind speed of the ion wind source to be always higher than the wind speed of the main pipe.
In the above embodiment, the air supply is provided by the air supply device, the ion air is provided by the ion air supply device 41, and neutralization and static electricity removal of the ion air are realized, the grounded metal tube device 42 provides the grounded metal tube 13, contact static electricity removal of the grounded metal tube is realized, the electrostatic voltage of the powder is measured by the static electricity measuring device 43, and the wind speed of the main pipe section and the wind speed of the ion air source are monitored by the online wind speed meter 17.
As an alternative embodiment, in the method, the voltage safety value is 1/4 to 3/4 of the electrostatic voltage value of the electrostatic spark phenomenon of the powder particles; the known voltage is a physical quantity in direct proportion to the electric charge, the voltage reflects the object electrification degree, and the voltage is directly related to whether electric spark and breakdown phenomena occur or not, so the purpose of setting the voltage safety value is to avoid the electric spark phenomena of powder particles in a pneumatic conveying pipeline.
Optionally, the measurement of the electrostatic voltage of the powder can also realize that when the measured electrostatic voltage of the powder exceeds a preset voltage safety value and continues to rise, a fourth signal is fed back to the control center so that the control center can control and increase the charge of the ion wind; in the above-described apparatus, the control center may control to increase the voltage of the ion wind supply device 41.
As an alternative embodiment, in the method, the total air volume of the ion air does not exceed one tenth of the main air volume of the pneumatic conveying pipeline, and because the excessive air volume of the ion air can influence the normal production operation of powder conveying of the main pipeline, the following relationship exists for the static electricity removing device for the powder pneumatic conveying system:
wherein n is the number of the ion wind spray heads 22 of the ion wind supply device 41; d is the air duct diameter of the ion air shower 22; v is the wind speed of the ion wind shower 22; d is the diameter of the main pipeline of the pneumatic conveying pipeline; v is the wind speed of the main pipeline of the pneumatic conveying pipeline.
As an alternative embodiment, in the method, the distance L between the measuring point of the electrostatic voltage of the powder and the first position is defined by the first position of the ion wind supply inlet and the second position of the grounded metal pipe inlet on the pneumatic conveying pipeline 1 Not less than 5D, the distance L between the measuring point of the electrostatic voltage of the powder and the second position 2 Less than or equal to 10D, wherein D is the diameter of a main pipeline of the pneumatic conveying pipeline; that is, the distance L between the electrostatic measuring device 43 and the ion wind shower head 22 of the ion wind supplying device 43 should be 1 Distance L between the rear grounded metal pipe device 42 and 5D or more 2 And less than or equal to 10D, and avoids excessive accumulation of powder charges and voltage rise before the powder charges enter the grounding metal tube device 42 and excessive voltage difference measured by the static electricity measuring device 43, and electric sparks are formed by contact with the grounding metal tube device 42.
The method and the device for removing static electricity for the powder pneumatic conveying system are used for removing static electricity by coupling the ion wind and the grounded metal pipe, so that the problem that excessive or insufficient static electricity is easily caused by removing the static electricity by the traditional ion wind is solved, and the problem that the effect of removing the static electricity is not obvious due to removing the static electricity by the traditional metal pipe is solved; by adopting the measurement of the electrostatic voltage of the powder in the pneumatic conveying pipeline and the wind speed measurement, the control center controls the starting and stopping of the ion wind supply device 41 and the opening of the electromagnetic valve 8, so that the energy consumption is reduced, and the fault tolerance of eliminating static electricity is improved; in addition, the ion wind enters the pneumatic conveying pipeline in a tangential air inlet rotational flow mode, so that the powder particles are contacted with the ion wind, and meanwhile, the accumulated powder particles are purged, and the fluidity is improved.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.
Claims (12)
1. The method for removing static electricity for the powder pneumatic conveying system is characterized by adopting ion wind to neutralize and remove static electricity, and adopting a method for removing static electricity by coupling a grounded metal pipe to contact and remove static electricity, and specifically comprises the following steps of:
the powder particles are conveyed into a pneumatic conveying pipeline by the air conveying and supplying air, and the powder particles are neutralized and removed by ion wind in the pneumatic conveying pipeline to be contacted with a grounded metal pipe to remove static electricity; the ion wind is in a closed state in the initial state, and the grounding metal pipe is in a power-on running state in the initial state;
measuring the electrostatic voltage of powder particles in the pneumatic conveying pipeline before the powder particles are contacted with a grounded metal pipe to remove static electricity; when the electrostatic voltage of the powder exceeds a preset voltage safety value, a first signal is fed back to the control center so that the control center can control the starting of the ion wind and control the charge and the wind quantity of the ion wind; when the electrostatic voltage of the powder is lower than a preset voltage safety value, feeding back a second signal to the control center so that the control center can control the ion wind to be closed;
measuring the air speed of a main pipe section of the pneumatic conveying pipeline and the air speed of an ion wind source respectively; when the wind speed of the main pipe section is not lower than the wind speed of the ion wind source, a third signal is fed back to the control center, so that the control center can control the wind speed of the ion wind source to be always higher than the wind speed of the main pipe.
2. The method for removing static electricity for powder pneumatic conveying system according to claim 1, wherein the voltage safety value is 1/4 to 3/4 of the electrostatic voltage value of the electrostatic spark phenomenon of powder particles.
3. The method for removing static electricity for powder pneumatic conveying system as claimed in claim 1, wherein when the measured electrostatic voltage of the powder exceeds a preset voltage safety value and continues to rise, a fourth signal is fed back to the control center so that the control center controls the charge of the ion wind to be increased.
4. The method for removing static electricity for powder pneumatic conveying system according to claim 1, wherein the total air quantity of the ion air is not more than one tenth of the main air quantity of the pneumatic conveying pipeline.
5. The method for removing static electricity from a powder pneumatic conveying system as claimed in claim 4, wherein the distance L between the measuring point of the electrostatic voltage of the powder and the first position is defined by the ion wind supply inlet on the pneumatic conveying pipeline being the first position and the grounding metal pipe inlet being the second position 1 Not less than 5D, the distance L between the measuring point of the electrostatic voltage of the powder and the second position 2 And the diameter of the main pipeline of the pneumatic conveying pipeline is less than or equal to 10D.
6. The method for removing static electricity for powder pneumatic conveying system according to claim 1, wherein the ion wind spraying direction in the pneumatic conveying pipeline is in the same direction as the flow direction of the pneumatic conveying powder, and the included angle between the axis in which the ion wind spraying direction is located and the axis of the pneumatic conveying pipeline is 30-60 degrees.
7. The device for removing static electricity for the powder pneumatic conveying system is characterized by comprising a pneumatic conveying pipeline, a feeding device, a conveying wind supply device, an ion wind supply device, a grounding metal pipe device, a receiving device, an online wind speed instrument and a static electricity measuring device, and a control center for controlling and connecting the conveying wind supply device, the ion wind supply device, the grounding metal pipe device, the online wind speed instrument and the static electricity measuring device;
the conveying wind supply device and the feeding device are sequentially arranged at the inlet end of the pneumatic conveying pipeline, the receiving device is arranged at the outlet end of the pneumatic conveying pipeline, and the conveying wind supply device is used for conveying powder particles provided by the feeding device to the receiving device at the outlet end of the pneumatic conveying pipeline; the ion wind supply device and the grounding metal pipe device are both arranged on the pneumatic conveying pipeline, the ion wind supply device is used for conveying ion wind into the pneumatic conveying pipeline, the grounding metal pipe device is used for releasing charges for powder particles flowing through, and the ion wind supply device is arranged at the front section of the grounding metal pipe device;
the on-line wind speed instrument is respectively arranged at the inlet end of the pneumatic conveying pipeline and the outlet end of the ion wind supply device and is used for respectively measuring the wind speed of a main pipe section of the pneumatic conveying pipeline and the wind speed of an ion wind source of the ion wind supply device; the electrostatic measuring device is communicated to the inner side of the pneumatic conveying pipeline and is used for measuring electrostatic voltage of powder before entering the grounded metal pipe device and after passing through the ion wind device;
the control center controls the ion wind source wind speed to be larger than the main pipe section wind speed according to the measurement data of the online wind speed instrument;
a voltage safety value is preset in the control center; when the measurement data of the static measurement device exceeds a voltage safety value, the control center controls the ion wind supply device to be started, and controls the voltage and the wind speed of the ion wind supply device; and when the measured data of the static measuring device is lower than a voltage safety value, the control center controls the ion wind supply device to be closed.
8. The device for removing static electricity for powder pneumatic conveying system according to claim 7, wherein the ion wind supply device comprises a plurality of ion wind spray heads, a positive pressure direct current power supply, a negative pressure direct current power supply, two first insulating flanges, an air compressor and an electromagnetic valve;
the two first insulating flanges are arranged at intervals along the extending direction of the pneumatic conveying pipeline, and an ion wind spray head mounting area is formed between the two first insulating flanges;
the ion wind spray heads are arranged in an array along the extending direction of the pneumatic conveying pipeline in the ion wind spray head mounting area, and the ion wind spray heads are communicated into the pneumatic conveying pipeline along a tangential air inlet angle; the air pipe interface of the input end of the ion air spray head is communicated to the air compressor by adopting an air pipe, and the electromagnetic valve is arranged on the air pipe; the electromagnetic valve is connected with the control center in a control way, and the opening degree of the electromagnetic valve controls the wind speed of the ion wind source; the power interface of the ion wind spray head is connected with the output ends of the positive-voltage direct-current power supply and the negative-voltage direct-current power supply respectively by adopting wires, and the input ends of the positive-voltage direct-current power supply and the negative-voltage direct-current power supply are connected to the signal output end of the control center respectively.
9. The device for removing static electricity for a powder pneumatic conveying system according to claim 7, wherein the grounded metal pipe device comprises a metal pipe, a grounding wire and two second insulating flanges;
two ends of the metal pipe are connected into the pneumatic conveying pipeline along the extending direction of the pneumatic conveying pipeline by adopting two second insulating flanges, and the metal pipe is connected with a grounding wire.
10. The device for removing static electricity for powder pneumatic conveying system according to claim 9, wherein the static electricity measuring device is arranged in the middle pipe section of the ion wind supplying device and the grounded metal pipe device, and comprises a metal probe, an insulating supporting piece, a collector plate and a static electricity meter provided with a meter measuring probe and a digital acquisition module; one end of the metal probe extends into the metal pipe section, and the metal probe and the metal pipe wall are supported and fixed by the insulating support piece; the input end of the collector plate is connected with the metal probe through a wire, and the position of the instrument measuring probe of the electrostatic instrument corresponds to the collector plate; the static electricity meter is used for measuring the electric potential on the collector plate and outputting a digital signal to the control center.
11. The device for removing static electricity for a powder pneumatic conveying system according to claim 8, wherein the ion wind spray head comprises a spray head shell, a needle electrode and a circuit board; one end of the nozzle shell is provided with an ion wind air inlet, the other end of the nozzle shell is provided with an ion wind outlet, one end of the needle electrode stretches into the interior of the nozzle shell, the other end of the needle electrode is fixedly supported by the nozzle shell through the circuit board, the needle electrode is used for providing positive and negative charges so as to enable the needle electrode to enter gas molecules in the interior of the ion wind nozzle shell through the ion wind air inlet to capture the positive and negative charges to form ion wind, and the ion wind is sprayed into the pneumatic conveying pipeline through the ion wind outlet.
12. The device for removing static electricity for powder pneumatic conveying system as claimed in claim 7, wherein the ion wind supply device and the grounded metal pipe device are in one-to-one correspondence in number to form static electricity removing units on the pneumatic conveying pipeline, and the static electricity removing units are arrayed in the extending direction of the pneumatic conveying pipeline.
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| CN202210857498.8A CN115196349B (en) | 2022-07-20 | 2022-07-20 | Method and device for removing static electricity for powder pneumatic conveying system |
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| CN114383982A (en) * | 2020-10-06 | 2022-04-22 | 华北电力大学 | Method for homogenizing spatial sensitivity of electrostatic sensor |
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| CN104259137A (en) * | 2014-08-29 | 2015-01-07 | 京东方光科技有限公司 | Dedusting antistatic device |
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| CN109974397A (en) * | 2018-08-24 | 2019-07-05 | 北京化工大学 | A kind of multi-purpose intelligent adjusts pneumatic conveying drying and electrostatic detection is eliminated and examines process units |
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