CN103894118B - A kind of system of controlling electrostatic level in fluid bed - Google Patents
A kind of system of controlling electrostatic level in fluid bed Download PDFInfo
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- CN103894118B CN103894118B CN201410116451.1A CN201410116451A CN103894118B CN 103894118 B CN103894118 B CN 103894118B CN 201410116451 A CN201410116451 A CN 201410116451A CN 103894118 B CN103894118 B CN 103894118B
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Abstract
The invention provides a kind of system of controlling electrostatic level in fluid bed, be applied to Electrostatic Control technical field, this system comprises: at least two are arranged at the Electrostatic Control subsystem at different bed heights place, wherein, Electrostatic Control subsystem comprises: the electrostatic potential at electrostatic measurement Equipment Inspection bed height of living in place; Controller calculates the electrostatic potential that detects and the difference of target electrostatic potential, and according to the positive and negative and big or small generation control signal of difference; Ion wind devices produces ion wind according to control signal, and ion wind is sent into fluid bed inside, so that the fluidized particles in ion wind contact fluid bed, the charged situation of change fluidized particles, makes the electrostatic potential level at this Electrostatic Control subsystem bed height of living in place reach target electrostatic potential. The present invention has taken into full account the feature that axially can change of the electrostatic potential in fluid bed along fluid bed, and the static at different bed heights place is carried out to static Processing for removing targetedly, safety and environmental protection of the present invention, and the electrical efficiency that disappears is high.
Description
Technical field
The present invention relates to Electrostatic Control technical field, particularly, relate to a kind of system of controlling electrostatic level in fluid bed.
Background technology
Gas-solid fluidization technology is widely used in the fields such as petrochemical industry, chemical industry, metallurgy, the energy, material, environmental protection, pharmacy. QuietElectricity problem is to perplex for a long time the technical barrier of gas-solid fluidized bed reactor production operation. The existence of static not only can affect fluid bedInterior hydrodynamics behavior, also can cause that such as knot sheet, distribution grid obstruction and even parking etc. has a strong impact on the operation of device continuityProblem.
At present, in order to reduce and to eliminate the electrostatic hazard in gas-solid fluidization process, people have proposed a series of solutions,For example, disappear with surface treatment, the change of operating condition, increase gas humidity, the installation static of antisatic additive, wallRemove device etc.
By the analysis to said method applicable cases, can find that the method for existing reduction or elimination electrostatic hazard exists allHow not enough, for example:
1, using the shortcoming of antistatic additive is in gas-solid fluidized bed reactor production process, and antistatic additive conventionally all has and presses downThe character of catalyst in reactor activity processed, or there is the problem that changes product characteristics and quality; Even certain class antistatic additiveThere is no poisonous substance effect for specific catalyst, be difficult to be adapted to wider production technology yet; And in food and medicine phaseClose industry, the antistatic additive adding must meet product specification requirement, also needs to obtain state food and drug control departmentApproval.
2, wall surface-treated static eradicating efficacy is not obvious, and it is high in industrial large-sized reactor, to implement difficulty, effectEffect is poor.
Thereby the static 3, changing in operating condition reduction or elimination fluidized-bed reactor has larger limitation, limitedIn technological requirement and the quality requirement of production, operating condition can only change within the specific limits, and therefore static is eliminatedDeGrain, the adjustable range of electrostatic level is narrower.
4, increasing gas humidity is the effective ways that reduce electrostatic level in fluidized bed reactor, but because water is some catalysisThe poisonous substance of agent, therefore the scope of application of this method has limitation, and in the environment of high temperature, increases the method for relative humidityReduction to static and eradicating efficacy are not good.
Research is found, is made the particle in fluidized-bed reactor contact and can reduce or eliminate the entrained electricity of particle with charged gasLotus. Publication number is that the patent scheme of CN1275135A discloses a kind of technique of producing polymer, provides a kind of in polymerizationIn process, in fluidized-bed reactor, produce the device of corona discharge, this device is positioned at the upper limit position of fluid bed, and this patent existsBetween clava in insertion fluid bed and pipe, apply AC voltage difference, ionize in fluid bed by the corona discharge of electrodeFluidizing gas, thereby generate charged gas. But the electric equipment that disappears of this intrusive mood can cause the flow field in fluid bedDestroy, easily form dead band, bring out knot sheet or caking; In addition, research shows that the electrostatic level in fluid bed exists verticallyDistribute, polarity inversion even can occur sometimes, but above-mentioned patent scheme can not be according to diverse location place in fluidized-bed reactorElectrostatic level is adjusted the corona discharge parameter of relevant position, and the electrical efficiency that disappears is limited.
Generally speaking, develop simple and direct accurately, safety and environmental protection, applicability is strong, efficiency is high electrostatic level control method and device,The long period stable and device that ensures fluidized-bed reactor operation is produced continuously, significant.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of system of controlling electrostatic level in fluid bed, to provide one to haveEffect is controlled the technology of electrostatic level in fluid bed.
To achieve these goals, the invention provides a kind of system of controlling electrostatic level in fluid bed, described system comprise toFew two Electrostatic Control subsystems, and described at least two Electrostatic Control subsystems are along the different beds of being axially set in of fluid bedAt The Height, wherein, described Electrostatic Control subsystem comprises:
Electrostatic measurement equipment, for detection of the electrostatic potential at this Electrostatic Control subsystem bed height of living in place;
Controller, for the electrostatic potential that detects described in calculating and the difference of target electrostatic potential, and positive and negative according to described differenceAnd size generates control signal;
Ion wind devices, for producing ion wind according to described control signal, and sends described ion wind into fluid bed inside,So that described ion wind contacts the fluidized particles in described fluid bed, change the charged situation of described fluidized particles, make this staticThe electrostatic potential level at RACS bed height of living in place reaches described target electrostatic potential.
By means of technique scheme, the different beds that at least two Electrostatic Control subsystems are arranged at fluid bed by the present invention are highDegree place, utilizes the electrostatic potential at electrostatic measurement device measuring bed height of living in place, utilize controller according to detected electrostatic potential withThe difference situation of target electrostatic potential, controls ion wind devices and produces ion wind, finally described ion wind is input in fluid bedPortion, the charged situation that contacts to change fluidized particles by described ion wind with fluidized particles, makes bed height of living in placeElectrostatic potential level reaches target electrostatic potential. The present invention has taken into full account axially can send out along fluid bed of the electrostatic potential in fluid bedThe feature of changing, carries out static Processing for removing targetedly to the static at different bed heights place, has not only reduced fluidisationStatic in bed, and the electrostatic potential level in fluid bed is controlled to preset level, than prior art, the present invention's peaceLoopful is protected, and the electrical efficiency that disappears is high, can monitor in real time the electrostatic level in fluid bed, does not affect product quality and production processContinuity, has ensured the stable operation of producing.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, institute in describing embodiment belowNeed the accompanying drawing using to be briefly described, apparently, the accompanying drawing in the following describes is only enforcements more of the present inventionExample, for those of ordinary skill in the art, is not paying under the prerequisite of creative work, can also be attached according to theseFigure obtains other accompanying drawing.
Fig. 1 (A) is the structural representation of the system of electrostatic level in control fluid bed provided by the invention;
Fig. 1 (B) is the concrete structure schematic diagram of Electrostatic Control subsystem provided by the invention;
Fig. 2 is a kind of ion wind devices structural representation provided by the invention;
Fig. 3 is another kind of ion wind devices structural representation provided by the invention;
Fig. 4 is that use ion wind devices that the embodiment of the present invention one the provides electrostatic potential in fluid bed that disappears before electricity becomes over timeGesture;
Fig. 5 is that use ion wind devices that the embodiment of the present invention one the provides electrostatic potential in fluid bed that disappears after electricity becomes over timeGesture;
Fig. 6 is that the use ion wind devices that the embodiment of the present invention two provides disappears the interior electrostatic potential of electricity front and back fluid bed over timeTrend;
Fig. 7 is that the use ion wind devices that the embodiment of the present invention three provides disappears the interior electrostatic potential of electricity front and back fluid bed over timeTrend.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completelyDescribe, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment. Based on thisEmbodiment in invention, those of ordinary skill in the art are not making the every other reality obtaining under creative work prerequisiteExecute example, all belong to the scope of protection of the invention.
The invention provides a kind of system of controlling electrostatic level in fluid bed, as shown in Fig. 1 (A), this system comprises at least twoElectrostatic Control subsystem 10, and at least two Electrostatic Control subsystems are along the different bed heights of being axially set in of fluid bed place,As shown in Fig. 1 (B), each Electrostatic Control subsystem 10 comprises: electrostatic measurement equipment 11, controller 12 and ion wind devices13; Wherein,
Electrostatic measurement equipment 11, for detection of the electrostatic potential at this Electrostatic Control subsystem 10 bed height of living in place;
Controller 12 is for calculating the electrostatic potential that detects and the difference of target electrostatic potential, and according to the positive and negative and large your pupil of differenceBecome control signal;
Ion wind devices 13, for producing ion wind according to control signal, and is sent ion wind into fluid bed inside, so that ionFluidized particles in wind contact fluid bed, the charged situation of change fluidized particles, makes this Electrostatic Control subsystem bed of living in highThe electrostatic potential level at degree place reaches target electrostatic potential.
The present invention has taken into full account the feature that axially can change of the electrostatic potential in fluid bed along fluid bed, at fluid bedDifferent bed heights place Electrostatic Control subsystem is set respectively, each Electrostatic Control subsystem responsible is to its residing bedAt The Height is carried ion wind, thereby realized, the static at different bed heights place is carried out to static Processing for removing targetedly.In control fluid bed proposed by the invention, the system of electrostatic potential level can be used for the processes such as olefinic polymerization, dry, granulation. ProfitNot only can reduce the static in fluid bed by system provided by the invention, and the electrostatic potential level in fluid bed is controlled atPreset level, than prior art, safety and environmental protection of the present invention, the electrical efficiency that disappears is high, can monitor in real time quiet in fluid bedElectricity level, does not affect the continuity of product quality and production process, has ensured the stable operation of producing.
Because electrostatic potential has reflected the static size in fluid bed, electrostatic potential is higher, and static is just larger, and electrostatic potential is less, quietElectricity is also just less, and the present invention weighs the size of electrostatic level by electrostatic potential. In a kind of preferred embodiment, generalElectrostatic agent, electrostatic pressure table or fluid bed special-purpose electrostatic press measuring instrument can serve as electrostatic measurement equipment, are used for measuring fluid bedInterior electrostatic potential. On fluid bed, after punching, the measuring probe of electrostatic measurement equipment is stretched in fluid bed.
In a kind of preferred embodiment, controller specifically for: if the electrostatic potential in described fluid bed is greater than target electrostatic potential,The polarity of voltage of determining described ion wind is contrary with the electrostatic potential polarity in described fluid bed; If the static in described fluid bedGesture is less than target electrostatic potential, determines that the polarity of voltage of described ion wind is identical with the electrostatic potential polarity in described fluid bed; RootDetermine voltage swing and the air quantity of described ion wind according to the size of described difference; Polarity of voltage that generation comprises described ion wind,The control signal of voltage swing and air quantity information;
Ion wind devices specifically for: generate and to there is described polarity of voltage, voltage swing and air quantity according to described control signalIon wind.
In a kind of preferred embodiment, ion wind devices is by gas transmission pipeline, insulation board, dc source, high-pressure installationWith compositions such as needle electrodes, wherein, gas transmission pipeline stretches in described fluid bed, for to described fluid bed delivered insideDescribed ion wind; Insulation board is embedded in gas transmission pipeline inside; High-pressure installation connect respectively dc source, needle electrode withAnd controller, for producing DC voltage and put on needle electrode according to described control signal; Needle electrode is fixedly installed onOn described insulation board, and insulate mutually with described gas transmission pipeline, for discharging under the effect of described DC voltage, with electricityFrom the gas of inputting in described gas transmission pipeline, form ion wind.
Fig. 2 and the structural representation that Figure 3 shows that two kinds of typical ion wind devices.
As shown in Figure 2, ion wind devices comprise gas transmission pipeline 21, insulation board 22, dc source (not shown in Fig. 2),High-pressure installation (not shown in Fig. 2) and needle electrode 23; One end of columniform gas transmission pipeline 21 is stretched in fluid bed;Columniform insulation board 22 is embedded in gas transmission pipeline 21 inside, and coaxially arranges with gas transmission pipeline 21; Insulation board 22On be provided with vertically at least one deck needle electrode 23, be preferably 2～4 layers of needle electrode 23; Every layer of needle electrode 23 comprise toA needle electrode 23, and these needle electrodes 23 less is circumferentially evenly arranged along insulation board 22, is preferably every layer and comprises 2～256Individual needle electrode 23; Insulation between needle electrode 23 and gas transmission pipeline 21, it is right that the two forms electric discharge. Shown in Fig. 2 fromThe operation principle of sub-wind devices is as follows: the control signal that high-pressure installation generates according to controller, produces DC voltage and put onEach needle electrode 23, owing to there is DC voltage difference between needle electrode 23 and gas transmission pipeline 21, the two forms electric dischargeRight, the gas that inputs to gas transmission pipeline 21 passes through from insulation board 22 inside, under the effect of DC voltage difference, is ionized toThe gas particle in a large number with certain voltage polarity and certain electric charge size, forms ion wind, and ion wind is admitted to stream subsequentlyChange in bed.
As shown in Figure 3, ion wind devices comprise gas transmission pipeline 31, insulation board 32, dc source (not shown in Fig. 3),High-pressure installation (not shown in Fig. 3) and needle electrode 33; One end of columniform gas transmission pipeline 31 is stretched in fluid bed;At least one circular insulation board 32 is embedded in gas transmission pipeline 31, and perpendicular to the axial restraint of gas transmission pipeline 31Arrange, be preferably 2～4 insulation boards 32; Each insulation board 32 vertical uniform at least one needle electrode 33 that arrange in surface, excellentElect 2～256 needle electrodes 33 as; Each insulation board 32 is provided with at least one perforate, the area of perforate and insulation board 32The ratio of area is 1/20～19/20, is preferably 1/5～1/2; Insulation between needle electrode 33 and gas transmission pipeline 31, the two structureBecome electric discharge right. The operation principle of ion wind devices is as shown in Figure 3 as follows: the control letter that high-pressure installation generates according to controllerNumber, produce DC voltage and put on each needle electrode 33, owing to existing between needle electrode 33 and gas transmission pipeline 31DC voltage difference, it is right that the two forms electric discharge, and the perforate of the gas that inputs to gas transmission pipeline 31 from insulation board 32 passed through,Under the effect of DC voltage difference, be ionized to the gas particle in a large number with certain voltage polarity and certain electric charge size, i.e. shapeBecome ion wind, ion wind is admitted in fluid bed subsequently.
It should be noted that, in the time that enforcement is of the present invention, can select have according to actual conditions the ion wind devices of other structures,To reach the object that produces ion wind according to control signal, the present invention does not do concrete restriction to the concrete structure of ion wind devices,Be that Fig. 2 and Fig. 3 are only specific embodiments of the invention, the protection domain being not intended to limit the present invention, all in the present inventionSpirit and principle within, within the ion wind devices of other any structure all should be included in protection scope of the present invention.
When produced ion wind enters into behind fluid bed inside, if ion wind contacts with the inwall of fluid bed, will leadCause its anlistatig effect and slacken, contact with the inwall of fluid bed for fear of ion wind, preferred scheme is that gas is defeatedThe length of sending pipeline to stretch into fluid bed inside is set to be less than or equal to 1/4 times of fluid bed internal diameter.
The dc source that the present invention adopts can provide DC voltage, and its production capacity efficiency far is greater than AC power. In the present invention,Ionization forms ion wind and need under high-pressure situations, could realize, and should ensure to form the right needle-like electricity of electric discharge while therefore specifically enforcementDC voltage difference between the utmost point and gas transmission pipeline is larger, for example, can be 2000V～80000V, is preferably5000V～30000V。
In the present invention, the gas in gas transmission pipeline forms ion wind under ionization, and this gas can adopt raw materialGas or fluidizing gas or recyclegas. Concrete, can be directly obtain unstrpped gas or fluidizing gas is inputted again from fluid bedIn gas transmission pipeline.
In order to realize the automatic control of controller to ion wind devices, and make the ion wind of ion wind devices output reach expectionResult, in the present invention, controller can adoption rate integral differential PID(Proportion, Integral, Derivative) controlDevice processed, makes polarity of voltage, voltage swing and the air force of the ion wind that ion wind devices produces and controller generateControl signal forms PID and controls.
Concrete, the electrostatic potential signal x of collection is exported to controller by electrostatic measurement equipment, controller according to this electrostatic potential withThe difference relation of target electrostatic potential, and the ion wind devices quantity that controls of this controller, generate corresponding control signal UAnd send to each ion wind devices, wherein, the relation between control signal U and electrostatic potential signal x can be used following formula tableShow:
U=kx+b
Wherein, k, b are control coefrficient, need to determine by preliminary experiment, and preliminary experiment specifically carries out electrostatic measurement equipmentCold model experiment, determines the control coefrficient k, the b that react relation between control signal U and electrostatic potential signal x.
The parameters such as the polarity of voltage of ion wind devices, voltage swing, air quantity become PID to control with control signal U-shaped, in real timeAdjust the operating parameter of ion wind devices, thereby more targetedly the electrostatic level of inspection positions is controlled.
In the present invention, the number of electrostatic measurement equipment, controller and ion wind devices that Electrostatic Control subsystem comprises all canThink one or more.
Find realizing in process of the present invention, the electrostatic potential in fluid bed axially can change along fluid bed, but withThe electrostatic potential at one bed height place is basically identical.
Because the electrostatic potential at same bed height place in fluid bed is basically identical, survey for stretching into static in order to reduce on fluid bedThe perforate number of amount equipment, one preferably scheme at an Electrostatic Control subsystem (corresponding a certain bed height place) is onlyAn electrostatic measurement equipment is set, for measuring the electrostatic potential at this bed height place.
Because fluid bed is cylindrical equipment, in order to make produced ion wind can arrive each position in fluid bed, withImprove static eradicating efficacy, one preferably scheme is to make an Electrostatic Control subsystem comprise multiple ion wind devices, andThese ion wind devices are circumferentially evenly arranged along fluid bed, in from different azimuth to fluid bed, carry ion wind.
In a kind of preferred embodiment, Electrostatic Control subsystem is by an electrostatic measurement equipment, a controller and multipleIon wind devices composition, wherein, electrostatic measurement equipment and all ion wind devices are positioned at same bed height, and make instituteSome ion wind devices are circumferentially evenly arranged along fluid bed. In this embodiment, the ion that each ion wind devices producesHow much all identical polarity of voltage, voltage swing and the air quantity of wind be, and many according to ion wind devices number of the large I of air quantityDetermine less.
Because the solid holdup in gas-solid fluidized bed is higher, ion wind decays very soon, therefore, and the effect model of ion wind devicesIt is limited enclosing. In order to ensure static eradicating efficacy, a kind of preferably scheme be along fluid bed axially, at different bedsLayer height place arranges multiple Electrostatic Control subsystems, and makes the spacing of adjacent two Electrostatic Control subsystems be less than ion wind establishingStandby sphere of action.
Physical parameter, operating parameter etc. in the sphere of action of ion wind devices and the operating parameter of ion wind devices and fluid bedRelevant, in specific implementation process, to specific fluid bed and ion wind devices, need to determine that ion wind establishes by preliminary experimentStandby sphere of action.
Embodiment mono-
At high 2000mm, in the lucite fluid bed of internal diameter 420mm, use LLDPE (LLDPE)As fluidized particles, the quiet height of bed is 440mm, and compressed air is as fluidizing gas, and when fluidisation, superficial gas velocity is 0.7m/s.Use the electrostatic potential in electrostatic measurement device measuring fluid bed, electrostatic measurement equipment is installed on distribuor of fluidized bed top 300mmWith 500mm place. Current signal input control device after analog-to-digital conversion of electrostatic measurement equipment output 4～20mA storesAnd subsequent treatment. Ion wind devices adopts the structure shown in Fig. 2, and the placement of staggering of four needle electrodes, apart from air shooterRoad outlet 2cm and 12cm place be each arranges two needle electrodes. Ion wind devices is installed on fluid bed both sides, lays respectively at pointFabric swatch top 200mm and 400mm place. The internal diameter of gas transmission pipeline is 100mm, and stretching into length in fluid bed is 0Mm, in gas transmission pipeline, gas speed is 8m/s. Measure by experiment control signal U=-12x+330.
Use ion wind devices to disappear before electricity, in fluid bed electrostatic potential over time as shown in Figure 4, distribution grid top 300The balance electrostatic potential that mm and 500mm place record is respectively 290V and 725V. According to balance electrostatic potential value and control signalThe computing formula of U, the voltage that can calculate the ion wind devices mesohigh device at 200mm and 400mm place is distinguishedFor-3000V and-8000V. Fig. 5 uses the ion wind devices situation of change of electrostatic potential in fluid bed that disappears after electricity. Visible, makeHave comparatively significantly and reduce with the electrostatic level that ion wind disappears in the rear fluid bed of electricity.
Embodiment bis-
At high 1500mm, in the lucite fluid bed of internal diameter 400mm, use LLDPE (LLDPE)As fluidized particles, the quiet height of bed is 250mm, and compressed air is as fluidizing gas, and when fluidisation, superficial gas velocity is 0.5m/s.Use the electrostatic potential in electrostatic measurement device measuring fluid bed, electrostatic measurement equipment is installed on distribuor of fluidized bed top 300mmPlace. Current signal input control device after analog-to-digital conversion of electrostatic measurement equipment output 4～20mA stores and follow-up placeReason. Ion wind devices adopts the structure shown in Fig. 2, and placements of staggering of four needle electrodes, is exporting 2cm apart from gas transmission pipelineWith 12cm place is each two needle electrodes are set. Ion wind devices is positioned at 300mm place, distribution grid top, gas transmission pipelineInternal diameter is 100mm, and stretching into length in fluid bed is 100mm, and in pipeline, gas speed is 8m/s. Measure by experimentControl signal U=-12.5x-3000.
Fig. 6 shows and uses the ion wind devices electrostatic potential situation over time in fluid bed that disappears before electricity, distribution grid top 300The balance electrostatic potential that mm place records is 320V. According to the computing formula of balance electrostatic potential value and control signal U, Ke YijiThe voltage that calculation obtains the ion wind devices mesohigh module at 300mm place, distribution grid top is-7000V. Fig. 6 has shown useThe ion wind devices situation of change of electrostatic potential in fluid bed that disappears before and after electricity. Visible, use ion wind to disappear after electricity, in fluid bedElectrostatic level has significant decline.
Embodiment tri-
At high 2000mm, in the lucite fluid bed of internal diameter 420mm, use LLDPE (LLDPE)As fluidized particles, the quiet height of bed is 320mm, and compressed air is as fluidizing gas, and when fluidisation, superficial gas velocity is 0.7m/s.Use the electrostatic potential in electrostatic measurement device measuring fluid bed, electrostatic measurement equipment is installed on distribuor of fluidized bed top 400mmPlace. Current signal input control device after analog-to-digital conversion of electrostatic measurement equipment output 4～20mA stores and follow-up placeReason. Ion wind devices adopts the structure shown in Fig. 2, and apart from gas transmission pipeline outlet, 4cm place arranges one deck insulation board, absolutelyOn listrium, be evenly arranged 8 needle electrodes, needle electrode is vertical with circular insulating board surface, and insulation board is provided with a perforateFor delivery of gas, the area of perforate is 3/10 with the ratio of the area of circular insulating board. Ion wind devices is positioned at distribution grid top300mm place, gas transmission pipeline internal diameter is 100mm, and stretching into length in fluid bed is 50mm, and in pipeline, gas speed is 9M/s. Measure by experiment control signal U=-25x+1000.
Use ion wind devices to disappear before electricity, the balance electrostatic potential that 400mm place, distribution grid top records is 400V. According to flatThe computing formula of weighing apparatus electrostatic potential value and control signal U, can calculate 300mm place ion wind devices mesohigh moduleVoltage is-9000V. Fig. 7 uses the ion wind devices situation of change of electrostatic potential in fluid bed that disappears before and after electricity. As seen from Figure 7,Use ion wind to disappear after electricity, the electrostatic potential at 400mm place, distribution grid top drops to 50V, and the electrostatic level in fluid bed hasSignificant decline.
Above-described specific embodiment, has carried out further saying in detail to object of the present invention, technical scheme and beneficial effectBright, institute it should be understood that and the foregoing is only specific embodiments of the invention, the protection being not intended to limit the present inventionScope, within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., all should be included inWithin protection scope of the present invention.
Claims (10)
1. control the system of electrostatic level in fluid bed for one kind, it is characterized in that, described system comprises at least two Electrostatic Control subsystems, and described at least two Electrostatic Control subsystems are along the different bed heights of being axially set in of fluid bed place, wherein, described Electrostatic Control subsystem comprises:
Electrostatic measurement equipment, for detection of the electrostatic potential at this Electrostatic Control subsystem bed height of living in place;
Controller, for the electrostatic potential that detects described in calculating and the difference of target electrostatic potential, and according to the positive and negative and big or small generation control signal of described difference;
Ion wind devices, for producing ion wind according to described control signal, and described ion wind is sent into fluid bed inside, so that described ion wind contacts the fluidized particles in described fluid bed, change the charged situation of described fluidized particles, make the electrostatic potential level at this Electrostatic Control subsystem bed height of living in place reach described target electrostatic potential;
Described controller specifically for:
If the electrostatic potential in described fluid bed is greater than target electrostatic potential, determine that the polarity of voltage of described ion wind is contrary with the electrostatic potential polarity in described fluid bed;
If the electrostatic potential in described fluid bed is less than target electrostatic potential, determine that the polarity of voltage of described ion wind is identical with the electrostatic potential polarity in described fluid bed;
Determine voltage swing and the air quantity of described ion wind according to the size of described difference;
The control signal of polarity of voltage, voltage swing and air quantity information that generation comprises described ion wind;
Described ion wind devices specifically for:
Generate the ion wind with described polarity of voltage, voltage swing and air quantity according to described control signal.
2. system according to claim 1, is characterized in that, described ion wind devices specifically comprises: gas transmission pipeline, insulation board, dc source, high-pressure installation and needle electrode; Wherein,
Described gas transmission pipeline stretches in described fluid bed, for to ion wind described in described fluid bed delivered inside;
Described insulation board is embedded in described gas transmission pipeline inside;
Described high-pressure installation connects respectively described dc source, described needle electrode and described controller, for producing DC voltage and put on described needle electrode according to described control signal;
Described needle electrode is fixedly installed on described insulation board, and insulate mutually with described gas transmission pipeline, for discharging under the effect of described DC voltage, to ionize ion wind described in the γ-ray emission of input in described gas transmission pipeline.
3. system according to claim 2, is characterized in that, the length that described gas transmission pipeline stretches into described fluid bed inside is less than or equal to 1/4 times of described fluid bed internal diameter.
4. system according to claim 2, is characterized in that, described insulation board is cylindrical;
Described insulation board and described gas transmission pipeline are coaxially placed, and the gas of inputting in described gas transmission pipeline passes through from the cylindrical interior of described insulation board;
At least described in one deck, needle electrode is along the axial setting of described insulation board, and every layer of described needle electrode comprises the needle electrode that at least one is circumferentially evenly arranged along described insulation board.
5. system according to claim 2, is characterized in that, described insulation board is circular;
Described at least one, insulation board is perpendicular to the axial setting of described gas transmission pipeline, on each described insulation board, be vertically evenly equipped with needle electrode described at least one, and each described insulation board has at least one perforate, passes through for the gas of inputting in described gas transmission pipeline.
6. system according to claim 5, is characterized in that, described perforate is 1/5～1/2 with the ratio of the area of described insulation board.
7. system according to claim 1, is characterized in that, described electrostatic measurement equipment is electrometer or electrostatic pressure table or fluid bed special-purpose electrostatic pressure measuring instrument.
8. system according to claim 1, it is characterized in that, each described Electrostatic Control subsystem comprises a described electrostatic measurement equipment, a described controller and multiple described ion wind devices, and described multiple ion wind devices being circumferentially evenly arranged along described fluid bed.
9. system according to claim 1, is characterized in that, the spacing of adjacent two described Electrostatic Control subsystems is less than the sphere of action of described ion wind devices.
10. system according to claim 1, is characterized in that, described controller is PID PID controller.
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| WO2023218438A3 (en) * | 2022-05-11 | 2023-12-21 | C N Indu | An arrangement for static charge reduction |
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| CN104159385B (en) * | 2014-07-04 | 2016-07-27 | 中国石油化工股份有限公司 | A kind of static elimination method of polyethylene reactor |
| CN109974397B (en) * | 2018-08-24 | 2020-10-09 | 北京化工大学 | Multipurpose intelligent regulation air flow drying and electrostatic detection elimination inspection production device |
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| CN1275135A (en) * | 1998-06-27 | 2000-11-29 | 蒙特尔技术有限公司 | Process for produciton of polymer |
| CN101670254A (en) * | 2009-09-29 | 2010-03-17 | 浙江大学 | Method for reducing electrostatic level in fluidized bed reactor |
| CN201955349U (en) * | 2010-08-27 | 2011-08-31 | 东南大学 | Electrostatic induction type measuring device for local particle speed in fluidized bed |
| CN102731700A (en) * | 2012-07-03 | 2012-10-17 | 浙江大学 | Method for controlling particles distribution by adopting electric field and gas phase polymerization fluidized bed reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023218438A3 (en) * | 2022-05-11 | 2023-12-21 | C N Indu | An arrangement for static charge reduction |
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