CN101695643B - Coating equipment for spherical particles and coating process thereof - Google Patents
Coating equipment for spherical particles and coating process thereof Download PDFInfo
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- CN101695643B CN101695643B CN2009102369518A CN200910236951A CN101695643B CN 101695643 B CN101695643 B CN 101695643B CN 2009102369518 A CN2009102369518 A CN 2009102369518A CN 200910236951 A CN200910236951 A CN 200910236951A CN 101695643 B CN101695643 B CN 101695643B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses coating equipment for spherical particles and a coating process thereof, which belong to the field of coating technique in material modification technique and equipment thereof. The coating equipment mainly comprises a coating pot, an alcohol conveying system, a powder feeding system, an exhaust hood and a hot air hood which are all arranged in a box body provided with an operational window; the window is provided with a door, and in the coating process, all materials can move in a sealing state; the powder is conveyed from a back shaft central channel of the coating pot to the coating pot; and the coating pot body is evenly provided with meshes. In the coating process, coated particles are loaded into the coating pot first, and the coating pot rotates along the shaft center line to drive the coated particles in the pot to move; and at the same time, alcohol and substrate powder are sprayed on the coated particles, so that the coated particles keep growing and rounding. The invention overcomes the defects of unstable process, easy pot sticking, difficult cleaning of the pot body and the like in the current equipment, is easy to realize automatic operation, and can improve the working environment.
Description
Technical field
The invention belongs to coating technology and apparatus field thereof in the material modification technology, particularly a kind of equipment of wearing the clothes of spheric granules and the technology of wearing the clothes thereof of being used for of operation of wearing the clothes of the coated particle in the manufacturing of HTGR fuel element.
Background technology
The employed ceramic mould fuel element of China's ball bed high temperature gas cooled reactor diameter is 60mm, structure be spherical coated particle (TRISO) disperse in the graphite matrix of fuel region, adopt the quasi-iso static pressing forming manufacture technique.Because pressure is higher in the pressing process, be prone to cause particle broken if directly contact between coated particle, so before compacting; Need be in the graphite matrix powder about coated particle outerwrap one bed thickness 0.25mm (be commonly called as " wear the clothes layer ") buffering between ball and the ball during as compacting; With the protection clad, this technology is commonly called as " wearing the clothes " (atomic energy science technology, 37 volumes; Supplementary issue, 41-44).
The equipment body of wearing the clothes of present German manufacturing be one through motor-driven, be shaped as the coating pot of rounding taper type, also comprise a cover helix powder feeding device and a cover alcohol induction system and a cover hot-air system.The helix powder feeding device is sent into the matrix graphite powder in the coating pot through pipeline above coating pot, is sprinkling upon the coated particle surface; The alcohol induction system is through air pressure alcohol to be transported to the atomizer that is positioned at the coated particle top, makes alcohol be the vaporific coated particle surface that is sprayed onto; The hot-air system particle oven dry of will wearing the clothes after finishing that is used to wear the clothes, this system introduces hot blast in the coating pot through pipeline.When wearing the clothes; Coating pot is rotated along axle with certain inclination angle; Coated particle forms vorticla motion under the rubbing action of coating pot inwall, above coated particle, spray alcohol simultaneously with wetting of particulates, and through the helix powder feeding device matrix graphite powder is fed in the vortex; Graphite matrix powder on coated particle constantly is wrapped in motion process and growing up reaches suitable size up to the particle of wearing the clothes.This equipment is to control the quality of wearing the clothes through regulating coating pot angle, rotating speed and adding parameters such as speed, the sprinkling alcohol speed of people's matrix powder and the area that atomizes.There is following shortcoming in this equipment: 1. the difficult control of operating parameter, and poor stability, qualification rate is low; In the process, particle is grown up gradually owing to wear the clothes, and the flow regime of particle constantly changes; So in operating process, need judge through experience and adjust coating pot inclination angle and rotating speed, so to different operation person or different inventory; Yield rate differs greatly, and qualification rate is hanged down between 60%～85%.2. it is serious with coated particle that the bottom of a pan adheres to the matrix graphite powder, and when the matrix graphite powder spreads the particle surface of motion, powder can pass in the intergranular space and down move; In this process, most of matrix powder can adhere to particle surface and form the layer of wearing the clothes, and few part can deposit in the bottom of a pan; Because particle is under the alcohol dampening state, and contains alcohol-soluble resin in the matrix graphite powder, carries out with the process of wearing the clothes; Matrix graphite powder and particle can adhere to the bottom of a pan gradually, and be long-pending more thick more.Sticking pot not only influences yield rate, and makes troubles for the cleaning of coating pot, also will consume a large amount of alcohol simultaneously.Action pane, all be positioned at the coating pot front panel for powder access port, alcohol access port, hot-blast pipe line inlet, material is open, has matrix powder and alcohol to overflow when wearing the clothes, and causes the working environment deterioration.
Along with applying of HTGR; The large-scale production of its fuel element is all had higher requirement to technology stability, yield rate, the operating environment of equipment; One of key equipment that the machine of wearing the clothes is produced as element need improve at above-mentioned everyway.
Summary of the invention
The purpose of this invention is to provide and effectively to overcome the technology a kind of equipment of wearing the clothes of spheric granules and technologies of wearing the clothes thereof of being used for unstable, problems such as product percent of pass is low, the operation cleaning is numerous and diverse, poor working environment that existing equipment exists when producing; Said wear the clothes equipment mainly by coating pot, alcohol induction system, constitute for powder system, exhaust hood and air bells cap.
Be evenly distributed with mesh on the said coating pot pot body, there is action pane the front, and the back is for connecting the rear axle of driving motor, and the rear axle of coating pot is connected through driving chain or gear with driving motor, and the coating pot rotating speed is controlled through regulating the driving motor rotating speed.During work, driving motor drives coating pot and rotates along the rear axle axial line.
Said alcohol induction system comprises alcohol container, flow control valve, nozzle and pipeline, and nozzle is fixed in the coating pot through the backstay that is contained on the door, carries the flexible pipe of alcohol to be connected with nozzle from door perforation entering coating pot; During work, the alcohol in the alcohol container leans on air pressure or peristaltic pump, is delivered to nozzle atomization through flow control valve; Alcohol is used for wetting particle surface, so that the matrix powder adheres on particle.
Saidly comprise the hopper that is used to store the matrix graphite powder, give powder motor, screw feeder to powder system; The pipeline of screw feeder passes the entering coating pot from coating pot rear axle axle center; One end connects to the powder motor; The other end is preferably normal bend, and hopper communicates with the pipeline of giving powder motor one end, during work; Matrix powder in the hopper is advanced for powder driven by motor screw feeder to coating pot, fall into coating pot to bend; Bend pipe can reduce the airborne dust of matrix powder in coating pot.
Said exhaust hood is buckled in coating pot outer wall lower left, the concentrated position of movement of particles when promptly working, and exhaust hood links to each other with workshop exhausting-dusting system through pipeline, and exhaust system is opened and can be prevented to produce in the pot airborne dust when wearing the clothes.
Said air bells cap is buckled in coating pot outer wall upper right side, and position and exhaust hood are relative.Air bells cap can link to each other with the workshop hot-air system through pipeline.Hot blast is used to wear the clothes and accomplishes the oven dry of back particle, with the exhaust system acting in conjunction, guarantees that thermal current passes particle, fully heat transfer.
The above-mentioned machine of wearing the clothes, coating pot, exhaust hood, air bells cap all are installed in the seal case of a band door, and the coating pot action pane is as throwing discharge port, and the door on the casing can seal action pane, and all materials move in sealing state in the process of wearing the clothes.
Said coating pot is cylindrical or two taper types, is preferably two taper types.
The inwall of said coating pot is equipped with the oblique staggered deflector of " people " font; When coated particle rotatablely moves with coating pot; Scatter after deflector is taken up the pot bottom coated particle on the material surface, simultaneously, coated particle also can produce with staggered deflector and seesaw.Two kinds of forms of motion of this of coated particle have guaranteed the even material feeding of coated particle to alcohol and matrix powder.
The mesh of said coating pot is circular, square or rectangle, is preferably rectangle, and the size of mesh does not get stuck and the matrix powder can spill and is advisable to guarantee that coated particle does not spill, and the diameter of circular hole, the square hole length of side are 0.3-0.65mm; Rectangle mesh minor face is long to be 0.3-0.65mm, and long limit is 1-10mm.
The mesh of said coating pot mainly contains three effects in the technology of wearing the clothes: (1) the powder passage that falls.When adopting above-mentioned German equipment to wear the clothes; Sticking pot mainly is that gathering forms in the bottom of a pan because part matrix powder passes coated particle; When employing has the pore structure coating pot; The mesh that the matrix powder that is not adhered to by coated particle can pass through the coating pot wall sifts out and falls into the powder-receiving disc that is arranged under the coating pot, has avoided the gathering of matrix powder in the bottom of a pan, can avoid sticking pot through technology controlling and process.(2) air exhaust passage.Being held in the outer exhaust hood of coating pot is connected through pipeline with the exhausting-dusting system; It makes the matrix powder that is blown afloat by the alcohol atomization gas pass coated particle with air-flow; The wetted coated particle of most of dust meeting adheres to, and the matrix powder that is not adhered to then passes the coating pot mesh and taken away by the exhausting-dusting system.(3) hot-air channel.Wearing the clothes need feed hot blast after accomplishing particle is dried in coating pot, hot blast is to blast through the fan housing of pipeline outside being held in coating pot, with the acting in conjunction of exhausting-dusting system; Make thermal current pass the particle of wearing the clothes; Like this, hot-air and particle fully carry out heat exchange, have improved drying efficiency.
Utilize the technology of wearing the clothes of the said equipment of wearing the clothes, its step is following:
A. the coated particle of in coating pot, packing into;
B. open coating pot driving motor and exhaust system, the coating pot rotating speed is 8-18rpm, is preferably 12-15rpm;
C. open and give powder system and alcohol induction system, powder-supplying speed is 60-120g/min, and the alcohol flow is 15-60ml/min;
D. the long 1.2-1.6mm of coated particle to be worn the clothes closes the alcohol induction system, gives powder system;
E. open heated-air drying, temperature 40-80 ℃, time 5～30min;
F. close hot blast, air draft, stop the coating pot driving motor.
The invention has the beneficial effects as follows the problem that exists during can effectively solve existing equipment produces, have following advantage: 1. technological parameter is provided with simply, need not artificially regulate in the operation, so product is stable and qualification rate is high, generally can both reach more than 90%.2. parameter is easy to control, can realize automation mechanized operation.3. equipment and technology is supporting, can guarantee the particle non-stick pan, simultaneously, from coating pot the powder that spills recyclable.4. when coating pot is cleaned, through nozzles spray alcohol the pot body is cleaned, cleaning fluid goes out from coating pot online orifice flow, collects in the bottom of a pan, compares convenience for washing and can practice thrift the alcohol more than 50% with the Germany machine of wearing the clothes.5. the whole process of wearing the clothes is all carried out in airtight casing, can guarantee the clean environmental protection of operating environment.
Description of drawings
Fig. 1 is the schematic, elevational view of the machine of wearing the clothes.Fig. 2 is the cutaway view of Fig. 1.
Fig. 3 is the work sketch map of the machine of wearing the clothes.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Embodiment 1:
The present invention provides and can effectively overcome the technology a kind of equipment of wearing the clothes of spheric granules and technologies of wearing the clothes thereof of being used for unstable, problems such as product percent of pass is low, the operation cleaning is numerous and diverse, poor working environment that existing equipment exists when producing.In the structural representation of the equipment of wearing the clothes illustrated in figures 1 and 2, the machine of wearing the clothes comprises porose bipyramid platform shape coating pot 1, alcohol induction system, gives powder system, exhaust hood 16 and air bells cap 4.There is action pane coating pot 1 front, and door 13 is set on the action pane, and coating pot 1 back links to each other with rear axle 3, and driving motor 8 and rear axle 3 are connected through chain, rotate with drive coating pot 1.The mesh 10 that distributes on 1 pot of body of coating pot is rectangle, and minor face is long to be 0.55mm, and long limit is 5mm; Inwall is equipped with the oblique staggered deflector 2 of " people " font.Comprise hopper 5, give powder motor 6, screw feeder 7 to powder system, the screw feeder pipe of screw feeder 7 passes from rear axle 3 axle center and gets in the coating pot 1, and an end connects to powder motor 6; The other end is a normal bend 11; Hopper 5 communicates with the screw feeder pipe of giving powder motor 6 one ends, during work, drives screw feeder 7 rotations for 6 rotations of powder motor; Matrix powder in the hopper 5 is advanced in coating pot 1, and the matrix pruinescence is pushed into bend pipe 11 places and falls in the coating pot 1; The alcohol induction system comprises alcohol container, peristaltic pump, flow control valve, nozzle 15 and pipeline; Carry the pipeline of alcohol to be connected with nozzle 15 from door 13 perforation entering coating pot 1; Nozzle 15 is fixed in the coating pot 1 through the backstay 14 that is contained on the door 13; Under the effect of peristaltic pump, alcohol is exported from alcohol container through pipeline and flow control valve and is arrived nozzle 15.Be placed with powder-receiving disc 9 under the coating pot 1.
Above-mentioned coating pot 1, powder-receiving disc 9, exhaust hood 16, air bells cap 4 all are installed in the seal case 12.The coating pot action pane is equipped with door 13, and door 13 seals action pane.During work, all materials all are in sealing state.
(see Fig. 2 and Fig. 3) during work, coating pot 1 is by driving motor 8 driven rotary that are connected with rear axle 3, and the coated particle 17 in the coating pot 1 leans on the rubbing action of coating pot wall and the water conservancy diversion direction of edge deflector 2 wherein to move.Matrix powder in the hopper 5 is sent in the coating pot 1 through screw feeder 7, and powder-supplying speed is by giving the control of powder motor 6 rotating speeds.The alcohol flow can be through regulating the flow-control valve opening control of alcohol induction system.The alcohol of certain flow is vaporific ejection from nozzle 15, is sprinkled upon the coated particle surface, makes the coated particle moistened surface.With the rotation of coating pot 1, wetting coated particle can move downward along the inclined plane of material in the pot, through bend pipe 11 outlets the time, contacts with the matrix powder that falls, and the matrix powder is adhered to.So move in circles, coated particle is grown up round as a ball gradually, becomes the particle of wearing the clothes of the size that requires at last.When coated particle during with the coating pot rotational motion, after taking up the pot bottom coated particle, deflector 2 scatters on the material surface, and simultaneously, coated particle also can produce with staggered deflector 2 and seesaw.Two kinds of forms of motion of coated particle have guaranteed the even material feeding of coated particle to alcohol and matrix powder.
Embodiment 2:
Adopt the machine of wearing the clothes of embodiment 1, the used processing step of wearing the clothes is following:
1. coated particle 5000g packs in coating pot 1;
2. open coating pot driving motor 8 and exhaust system, the coating pot rotating speed is 12rpm;
3. open and give powder system and alcohol induction system, powder-supplying speed is 90g/min, and the alcohol flow is 28ml/min;
4. wear the clothes and close the alcohol induction system behind the 60min, give powder system, blast 50 ℃ of hot blasts to coating pot 1 and the coated particle of wearing the clothes is carried out drying, time 20min;
5. close hot blast, air draft, stop the coating pot rotation.
Three batches of particle each size ranges after sieving of wearing the clothes that adopt the technology of equipment and the embodiment 2 of embodiment 1 to produce wear the clothes weight percentage result such as following table (unit: %):
Particle size is qualified at 1.2-1.6mm, and is visible, and yield rate is all more than 90%, and is high and stable.
Claims (5)
1. equipment of wearing the clothes that is used for spheric granules, said wear the clothes equipment mainly by coating pot, alcohol induction system, constitute for powder system, exhaust hood and air bells cap, it is characterized in that,
Be evenly distributed with mesh on the said coating pot pot body, the front is an action pane, and the back is for connecting the rear axle of driving motor, and during work, driving motor drives coating pot and rotates along the rear axle axial line;
Said alcohol induction system comprises alcohol container, flow control valve, nozzle and pipeline; Nozzle is fixed in the coating pot through the backstay that is contained on the door; Carry the flexible pipe of alcohol to be connected with nozzle from door perforation entering coating pot; During work, the alcohol in the alcohol container leans on air pressure or peristaltic pump, is delivered to nozzle atomization through flow control valve;
Saidly comprise the hopper that is used to store the matrix graphite powder, give powder motor, screw feeder to powder system; The pipeline of screw feeder passes the entering coating pot from coating pot rear axle axle center, during work, the matrix powder in the hopper is advanced in the coating pot for powder driven by motor screw feeder;
Said exhaust hood is buckled in coating pot outer wall lower left, the concentrated position of movement of particles when promptly working, and exhaust hood links to each other with the exhausting-dusting system through pipeline;
Said air bells cap is buckled in coating pot outer wall upper right side, and position and exhaust hood are relative, and air bells cap can link to each other with hot-air system through pipeline;
The above-mentioned machine of wearing the clothes, coating pot, exhaust hood, air bells cap all are installed in the seal case of a band door, and the coating pot action pane is as throwing discharge port, and the door on the casing can seal action pane, and all materials move in sealing state in the process of wearing the clothes.
2. according to the said equipment of wearing the clothes that is used for spheric granules of claim 1, it is characterized in that said coating pot is two taper types or cylindrical.
3. according to the said equipment of wearing the clothes that is used for spheric granules of claim 1; It is characterized in that the inwall of said coating pot is equipped with the oblique staggered deflector of " people " font, when coated particle rotatablely moves with coating pot; After taking up the pot bottom coated particle, deflector scatters on the material surface; Simultaneously, coated particle also can produce with staggered deflector and seesaw, and guarantees the even material feeding of coated particle to alcohol and matrix powder.
4. according to the said equipment of wearing the clothes that is used for spheric granules of claim 1; It is characterized in that; Mesh on the said coating pot body is circular, square or rectangle; The size of mesh does not get stuck and the matrix powder can spill to guarantee that coated particle does not spill, and wherein rectangle mesh minor face is long is 0.3-0.65mm, and long limit is 1-10mm.
5. the said technology of wearing the clothes that is used for the equipment of wearing the clothes of spheric granules of claim 1 is characterized in that, the wear the clothes technology of equipment of said utilization, and its step is following:
A. the coated particle of in coating pot, packing into;
B. open coating pot driving motor and exhaust system, the coating pot rotating speed is 8-18rpm,
C. open and give powder system and alcohol induction system, powder-supplying speed is 60-120g/min, and the alcohol flow is 15-60ml/min;
D. the long 1.2-1.6mm of coated particle to be worn the clothes closes the alcohol induction system, gives powder system;
E. open heated-air drying, temperature 40-80 ℃, time 5-60min;
F. close hot blast, air draft, stop the coating pot driving motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102369518A CN101695643B (en) | 2009-10-29 | 2009-10-29 | Coating equipment for spherical particles and coating process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102369518A CN101695643B (en) | 2009-10-29 | 2009-10-29 | Coating equipment for spherical particles and coating process thereof |
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| CN101695643A CN101695643A (en) | 2010-04-21 |
| CN101695643B true CN101695643B (en) | 2012-02-08 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110097979B (en) * | 2018-01-31 | 2022-11-18 | 中国辐射防护研究院 | Graphite dust collecting device for ball bed high-temperature gas cooled reactor |
| CN111640523B (en) * | 2020-04-29 | 2022-03-04 | 清华大学 | Die cavity quantitative powder adding equipment |
| CN112892396B (en) * | 2021-01-15 | 2022-03-22 | 清华大学 | Base powder coating equipment and process method for spherical nuclear fuel particles |
| CN116864168B (en) * | 2023-06-09 | 2024-05-17 | 武汉科技大学 | Nuclear fuel microsphere dressing method and equipment |
| CN117548028A (en) * | 2023-12-21 | 2024-02-13 | 宁波国锋新材料科技有限公司 | Automatic feeding device for producing grinding medium and use method |
Citations (1)
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|---|---|---|---|---|
| JP2008284501A (en) * | 2007-05-18 | 2008-11-27 | Noritake Co Ltd | Granulation method, zirconia granulated powder and zirconia porous body |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008284501A (en) * | 2007-05-18 | 2008-11-27 | Noritake Co Ltd | Granulation method, zirconia granulated powder and zirconia porous body |
Non-Patent Citations (2)
| Title |
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| 张杰等.固体颗粒表面改性及其在推进剂领域中的应用研究.《哈尔滨工业大学学报》.2004,第36卷(第9期),第1149～1152页第2节. * |
| 贺俊等.10MW高温气冷堆球形燃料元件制造.《原子能科学技术》.2003,第37卷(第S1期),第42页第1.2节. * |
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