CN103529312A - System for measuring micro-fine pulverized-coal particle charge-mass ratio distribution - Google Patents
System for measuring micro-fine pulverized-coal particle charge-mass ratio distribution Download PDFInfo
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- CN103529312A CN103529312A CN201310502946.3A CN201310502946A CN103529312A CN 103529312 A CN103529312 A CN 103529312A CN 201310502946 A CN201310502946 A CN 201310502946A CN 103529312 A CN103529312 A CN 103529312A
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Abstract
The invention discloses a system for measuring micro-fine pulverized-coal particle charge-mass ratio distribution. The system comprises a particle friction charging device, a particle electrical field separation device and a particle charge-mass ratio measurement device, wherein the particle friction charging device comprises a feeding cylinder and a vibrating feeder, and the feeding cylinder is connected with the feed end of the vibrating feeder; the particle electrical field separation device comprises two insulating plates with adjustable space, a particle separation chamber is formed between the insulating plates, electrode plates are arranged on the outer sides of the insulating plates and connected with a high-voltage power source through wires, a feeding funnel is arranged at the upper end of the particle separation chamber and connected with the discharging end of the vibrating feeder; and the particle charge-mass ratio measurement device comprises a plurality of charge-mass ratio measurement components arranged at the bottom end of the particle separation chamber transversely and densely. The system not only can be used for measuring bipolar charge of clean coal and a proportion of positive and negative live parts, but also can be used for measuring the charge condition of non-sorted coal particles, so that the micro-fine pulverized-coal particle charge-mass ratio is accurately measured.
Description
Technical field
The present invention relates to the friction charged mensuration of microfine coal particles, relate to particularly a kind of can Accurate Measurement particle in the mensuration system that distributes of specific charge.
Background technology
Frictional static sorting technology is the dry separation technology of a kind of clean, environmental protection, efficient, cheap sorting purification micro-size fraction mineral.Friction charged be according on particle charged polarity realize particle separation different from direction of motion quantity movement velocity in high-voltage electrostatic field.Therefore study material friction charged after, the charged situation of particle has directive significance very for the friction electrical selection of particle.But due to the bad direct mensuration of electric charge, and the electric charge reason such as can dissipate, the mensuration of particle specific charge is to use the method for traditional Faraday cylinder to measure always.
Material friction charged charged positive and negative relevant with the surface work function of two kinds of materials with the size of electric weight, when the friction of two kinds of material same friction materials, can produce contrary electric charge.Traditional faraday's method is measured the static charge that material specific charge can only be measured surveyed material, is the result after positive and negative charge is cancelled out each other, and therefore can not reflect the truth that material itself is charged.
Summary of the invention
Goal of the invention: the object of the invention is to measure for above-mentioned Faraday cylinder method the defect of particle specific charge, propose a kind of microfine pulverized coal particle specific charge measure of spread system, to realize the accurate measurement to microfine pulverized coal particle specific charge.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A pulverized coal particle specific charge measure of spread system, is characterized in that: comprise the friction charged device of particle, particle electric field separating device and particle specific charge determinator; The friction charged device of described particle comprises to barrel and oscillating feeder, is connected to barrel with the feed end of oscillating feeder, is provided with removable friction plate on the vibration plane of oscillating feeder; Described particle electric field separating device comprises two insulcretes that spacing is adjustable, between insulcrete, form particle separation chamber, outside at insulcrete is provided with battery lead plate, battery lead plate is connected with high-voltage power supply by wire, upper end in particle separation chamber is provided with batch meter, and batch meter is connected with the discharge end of oscillating feeder; Described particle specific charge determinator comprises that horizontal close-packed arrays is in some specific charges mensuration assemblies of bottom, particle separation chamber, specific charge is measured assembly and is comprised aggregate bin, aggregate bin below is provided with Faraday cylinder, Faraday cylinder is placed on electronic balance, Faraday cylinder is connected with digital type charge instrument by wire, and electronic balance is connected with computer by signal wire respectively with digital type charge instrument.
In the present invention, preferred, described insulcrete is obliquely installed, and forms the particle separation chamber of isosceles trapezoid between insulcrete.
In the present invention, preferred, the length of described battery lead plate is less than the length of insulcrete.
In the present invention, preferred, describedly to barrel, be provided with for regulating the operation valve of discharging speed.
Beneficial effect: the present invention both can measure the bipolar charge of clean coal, positive and negative live part ratio, also can be used for measuring the charged situation of not sorting coal particles, has realized the accurate measurement to microfine pulverized coal particle specific charge.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation that specific charge is measured assembly.
In figure: 1-is to barrel, 2-oscillating feeder, 3-friction plate, 4-batch meter, 5-particle separation chamber, 6-battery lead plate, 7-high-voltage power supply, 8-batch meter, 9-specific charge is measured assembly, 10-aggregate bin, 11-Faraday cylinder, 12-electronic balance, 13-digital type charge instrument, 14-computer.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is done further and explained.
As illustrated in fig. 1 and 2, microfine pulverized coal particle specific charge measure of spread system of the present invention comprises the friction charged device of particle, particle electric field separating device and particle specific charge determinator.The friction charged device of particle comprises to barrel 1 and oscillating feeder 2, be connected to barrel 1 with the feed end of oscillating feeder 2, to on barrel 1, be provided with for regulating the operation valve of discharging speed, on the vibration plane of oscillating feeder 2, be provided with removable friction plate 3, the length of friction plate 3 and material can be adjusted according to actual needs.Particle electric field separating device comprises two insulcretes 4 that spacing is adjustable, insulcrete 4 is obliquely installed, between insulcrete 4, form the particle separation chamber 5 of up-narrow and down-wide isosceles trapezoid, contribute to like this pulverized coal particle transverse dispersion in 5 folding processes of particle separation chamber to distribute, and particle separation chamber 5 top electric field intensity are unlikely to again to weaken too much.The angle of inclination of insulcrete 4 can be adjusted according to actual needs, and the width of particle separation chamber 5 can be by regulating the spacing of insulcrete 4 to adjust.In the outside of insulcrete 4, be provided with battery lead plate 6, the length of battery lead plate 6 is less than the length of insulcrete 4, can reduce like this between battery lead plate 6 impact that the electric field that forms causes below Faraday cylinder 11.Battery lead plate 6 is connected with high-voltage power supply 7 by wire, and wherein the battery lead plate 6 in left side is connected with high-voltage power supply 7 is anodal, and the battery lead plate 6 on right side is connected with high-voltage power supply 7 negative poles.In the upper end of particle separation chamber 5, be provided with batch meter 8, batch meter 8 is connected with the discharge end of oscillating feeder 2.Particle specific charge determinator comprises that horizontal close-packed arrays is in some specific charges mensuration assemblies 9 of 5 bottoms, particle separation chamber.Specific charge is measured the number of assembly 9 and can be adjusted according to actual needs, and more mensuration of number precision is just higher, and the number that the specific charge in the present embodiment is measured assembly 9 is 6.Because specific charge mensuration assembly 9 is closely connected, centre does not have gap, can guarantee to collect all pulverized coal particles that drop down onto 5 lower ends, particle separation chamber.Specific charge is measured assembly 9 and is comprised aggregate bin 10, aggregate bin 10 belows are provided with Faraday cylinder 11, Faraday cylinder 11 is placed on electronic balance 12, and Faraday cylinder 11 is connected with digital type charge instrument 13 by wire, and electronic balance 12 is connected with computer 14 by signal wire respectively with digital type charge instrument 13.
Principle of work of the present invention: after high-voltage power supply 9 energisings, the inner high-voltage electrostatic field that forms, particle separation chamber 5, pulverized coal particle is through being delivered to oscillating feeder 2 to barrel 1, effect of vibration by oscillating feeder 2 makes beans powder charged with friction plate 3 wipings that rub, then by batch meter 8, enter high-voltage electrostatic field, pulverized coal particle orbit in high-voltage electrostatic field with opposed polarity electric charge and varying number is different, the displacement departing from the process moving downward is also different, then fall into different specific charges and measure the aggregate bin 10 of assembly 9, finally be collected in Faraday cylinder 11, by electronic balance 12 and digital type charge instrument 13, measure respectively pulverized coal particle quality with electric charge, finally by computer 14, record pulverized coal particle specific charge.
It (is generally that density is less than 1.35g/cm that the present invention can be used to measure clean coal particle
3) with the specific charge measure of spread of not sorting coal particles.
Because clean coal particle has the characteristic of bipolar charge, so clean coal particle has and is divided into three classes in the process with friction material friction: lotus positive electricity particle, bear electricity particle and electric neutrality particle.Therefore clean coal particle, from after entering oscillating feeder 2 to barrel 1, forms three kinds of particles that typical case is different after same friction material friction, and three kinds of electrical different particles can move to different directions according to electrical difference through funnel 8 enters electric field 5 after.Electric neutrality particle substantially do not move and freely falling body fall in the middle of near aggregate bin, and lotus positive electricity particle and bear electricity particle is respectively to negative pole and positive polar motion, and the distance of moving to pole plate according to the size of institute's carrying capacity is not identical yet.Then the electrically charged particle of falling different aggregate bins 10 enters respectively different specific charges and measures assembly 9 its specific charges of mensuration, and the specific charge that finally obtains clean coal particle distributes.
Not sorting coal particles contains clean coal particle, diagenesis mineral grain and the particle not dissociating, clean coal particle is different from diagenesis mineral grain surface nature, therefore they understand the contrary electric charge of polarization after same friction material friction, it is generally clean coal particle positively charged, diagenesis mineral grain is electronegative, the particle not dissociating can just can be born, charged rear three kinds of particles enter electric field 5 through funnel 8, in electric field, can to negative pole or positive polar motion, realize by the different separation of specific charge respectively, particle after separation enters respectively different specific charges and measures assembly 9 its specific charges of mensuration, the specific charge that finally obtains not sorting coal particles distributes.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a microfine pulverized coal particle specific charge measure of spread system, is characterized in that: comprise the friction charged device of particle, particle electric field separating device and particle specific charge determinator;
The friction charged device of described particle comprises to barrel (1) and oscillating feeder (2), is connected to barrel (1) with the feed end of oscillating feeder (2), is provided with removable friction plate (3) on the vibration plane of oscillating feeder (2);
Described particle electric field separating device comprises two insulcretes (4) that spacing is adjustable, between insulcrete (4), form particle separation chamber (5), in the outside of insulcrete (4), be provided with battery lead plate (6), battery lead plate (6) is connected with high-voltage power supply (7) by wire, in the upper end of particle separation chamber (5), be provided with batch meter (8), batch meter (8) is connected with the discharge end of oscillating feeder (2);
Described particle specific charge determinator comprises that horizontal close-packed arrays is in some specific charges mensuration assemblies (9) of bottom, particle separation chamber (5), specific charge is measured assembly (9) and is comprised aggregate bin (10), aggregate bin (10) below is provided with Faraday cylinder (11), Faraday cylinder (11) is placed on electronic balance (12), Faraday cylinder (11) is connected with digital type charge instrument (13) by wire, and electronic balance (12) is connected with computer (14) by signal wire respectively with digital type charge instrument (13).
2. a kind of microfine pulverized coal particle specific charge measure of spread system according to claim 1, is characterized in that: described insulcrete (4) is obliquely installed, and forms the particle separation chamber (5) of isosceles trapezoid between insulcrete (4).
3. a kind of microfine pulverized coal particle specific charge measure of spread system according to claim 1 and 2, is characterized in that: the length of described battery lead plate (6) is less than the length of insulcrete (4).
4. a kind of microfine pulverized coal particle specific charge measure of spread system according to claim 3, is characterized in that: the described barrel (1) of giving is provided with for regulating the operation valve of discharging speed.
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| CN201310502946.3A CN103529312A (en) | 2013-10-23 | 2013-10-23 | System for measuring micro-fine pulverized-coal particle charge-mass ratio distribution |
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| CN201310502946.3A CN103529312A (en) | 2013-10-23 | 2013-10-23 | System for measuring micro-fine pulverized-coal particle charge-mass ratio distribution |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242123A (en) * | 2015-09-29 | 2016-01-13 | 兰州大学 | Suspension particle charge mass ratio measuring instrument |
| CN105676010A (en) * | 2016-01-07 | 2016-06-15 | 华南农业大学 | Device for measuring droplet charge-mass ratio of electrostatic spraying droplets |
| CN106291144A (en) * | 2016-07-26 | 2017-01-04 | 河北大学 | The measuring method of charged particle carrying capacity and measurement apparatus in electrostatic separator collecting tank |
| CN108120602A (en) * | 2017-12-11 | 2018-06-05 | 南京航空航天大学 | A kind of aero-engine air intake duct sand dust inhalation (inhalatio) electrostatic monitoring experimental bench |
| CN114700178A (en) * | 2021-02-10 | 2022-07-05 | 中国矿业大学 | Vertical distribution medium rod rotary friction electric separation equipment and electric separation method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242123A (en) * | 2015-09-29 | 2016-01-13 | 兰州大学 | Suspension particle charge mass ratio measuring instrument |
| CN105676010A (en) * | 2016-01-07 | 2016-06-15 | 华南农业大学 | Device for measuring droplet charge-mass ratio of electrostatic spraying droplets |
| CN106291144A (en) * | 2016-07-26 | 2017-01-04 | 河北大学 | The measuring method of charged particle carrying capacity and measurement apparatus in electrostatic separator collecting tank |
| CN106291144B (en) * | 2016-07-26 | 2018-10-23 | 河北大学 | The measurement method and device of charged particle carrying capacity in electrostatic separator collecting tank |
| CN108120602A (en) * | 2017-12-11 | 2018-06-05 | 南京航空航天大学 | A kind of aero-engine air intake duct sand dust inhalation (inhalatio) electrostatic monitoring experimental bench |
| CN114700178A (en) * | 2021-02-10 | 2022-07-05 | 中国矿业大学 | Vertical distribution medium rod rotary friction electric separation equipment and electric separation method |
| CN114700178B (en) * | 2021-02-10 | 2023-03-07 | 中国矿业大学 | Vertical distribution medium rod rotary friction electric separation equipment and electric separation method |
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Application publication date: 20140122 |