CN105776336B - A kind of UO2The method of pellet horizontal sintering in sintering furnace - Google Patents
A kind of UO2The method of pellet horizontal sintering in sintering furnace Download PDFInfo
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- CN105776336B CN105776336B CN201410826307.7A CN201410826307A CN105776336B CN 105776336 B CN105776336 B CN 105776336B CN 201410826307 A CN201410826307 A CN 201410826307A CN 105776336 B CN105776336 B CN 105776336B
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Abstract
The invention belongs to used in nuclear power station nuclear fuel element manufacture field, and in particular to a kind of UO2The method of pellet horizontal sintering in sintering furnace.Specifically include following steps：(1) molybdenum boat and V shaped slab are determined；(2) parameter of pellet green compact is determined；(3) horizontal sintering dress boat technique is determined；(4) horizontal sintering process is determined.The pellet useful load in sintering boat can be improved 30% using horizontal sintering process, in green density (5.90 6.10) g/cm3, the dress boat number of plies be that pellet density can meet the specification requirement and in control targe ρ in pellet boat under conditions of 11,12,13 layersAveragelyIn the range of ± 0.5%T.D, in layer and interlayer Density Distribution is uniform, every physicochemical property is satisfied by technical conditions requirement, better than being vertically arranged sintered products data；Production application display pellet yield rate is better than being vertically arranged the yield rate of sintering pellet, and the horizontal sintering process of pellet is fully able to meet production requirement.
Description
Technical field
The invention belongs to used in nuclear power station nuclear fuel element manufacture field, and in particular to a kind of UO2Pellet is horizontal in sintering furnace
The method of sintering.
Background technology
UO2Fuel pellet is by powder metallurgically manufacturing technique productions, UO2Powder is passed through again after press is pressed into green briquette
Sintering, grinding are produced into finished product pellet.UO2Pellet sintering is one of critical process of pellet manufacture, and sintering process is to product
Final performance serve it is conclusive, sintering operation by green briquette feed boat, enter stove, be passed through flowing gas, intensification, insulation, cold
But and the step composition such as come out of the stove.Current shop production line pellet sintering has been vertically arranged boat frame sintering process, its work using stacking
Skill process is UO2After the rotated press of powder is compressing, pellet green compact are continuously released in erectility by press setting wheel, behaviour
Make personnel the vertical code of pellet green compact is mounted on molybdenum dividing plate by artificial, treat to place the pellet green compact of enough line numbers on dividing plate
Afterwards, then it is layered during stacking puts false boat, false boat sinters personnel successively by the molybdenum of stacking green compact in false boat after being carried to sintering post
Dividing plate is ticked and is put into sintering furnace sintering boat, most laggard stove sintering.
Boat frame sintering process is vertically arranged using stacking and is disadvantageous in that loading, unloading material and agglomerate sampling are less square
Just；Artificial operation transhipment operation is more, easily causes the surface defect such as pellet green compact unfilled corner, scaling-off；Labor strength is big, production
Inefficiency；Open-sky technique does not meet the more strict environmental requirement of country；Every layer of pellet stacking needs to place molybdenum dividing plate, increases
Molybdenum materials consumption is added, has increased and push away boat resistance；The stacking limited amount of pellet in sintering boat, makes the production capacity of sintering furnace relatively low.
Therefore, from improving automatization level, reduce labor intensity, improve production economy benefit, many beneficial to anti-radiation protection etc.
, it is necessary to the existing sintering process of Improvement from the aspect of individual.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of production technology of horizontal sintering, is vertically arranged with solving existing stacking
There is the deficiency of boat frame sintering process.
In order to realize this purpose, the present invention is adopted the technical scheme that
A kind of UO2The method of pellet horizontal sintering in sintering furnace, comprises the following steps：
(1) molybdenum boat and V shaped slab are determined
The length L of molybdenum boat is 260mm, and width W is 134mm；
One piece of molybdenum V-type plate is placed in the bottom of molybdenum boat, V-type plate is brought into close contact with molybdenum boat, its thickness is 2mm；
9 V-shaped grooves are set in the centre position of V-type plate along molybdenum boat width, each spacing of V-groove is 14mm, V
The angle of shape groove is 90 °, using the arc transition structure of R=1mm between adjacent V-shaped groove；
(2) parameter of pellet green compact is determined
The pellet of use is cylindrical structure, and its density is 5.90~6.10g/cm3, highly it is 15.00~16.50mm,
A diameter of 10.00mm, completes pellet from vertical state to the conversion of horizontal state after the completion of compacting；
(3) horizontal sintering dress boat technique is determined
Pellet loads molybdenum boat by the way of single file, and the bottom places pellet in molybdenum corrugated plating V-type line by line in molybdenum boat
In groove, the bottom fills 9 row pellets, and then last layer fills 10 row pellets, and subsequent layers replace 9 rows, 10 luggage boats；Every row pellet number
Amount is fixed；
In molybdenum corrugated plating V-groove place pellet when, pellet from be released to fall to V-groove distance be 4mm；
(4) horizontal sintering process is determined
Horizontal sintering uses continuous boat pushing formula sintering furnace, is stopped under conditions of being 1750 DEG C in sintering temperature 410 minutes
Production technology.
Further, a kind of UO as described above2The method of pellet horizontal sintering in sintering furnace, the material of V-type plate is
Molybdenum-lanthanum alloy, maximum operating temperature is 1800 DEG C.
Further, a kind of UO as described above2The method of pellet horizontal sintering in sintering furnace, often row pellet is 15
Block；The number of plies of the built-in pellet of molybdenum boat is 11~13.
The beneficial effect of technical solution of the present invention is：
In green density (5.90-6.10) g/cm3, the dress boat number of plies be pellet in pellet boat under conditions of 11,12,13 layers
Density can meet the specification and require and in control targe ρAveragelyIt is equal with interlayer Density Distribution in layer in the range of ± 0.5%T.D
Even, every physicochemical property is satisfied by technical conditions requirement, better than being vertically arranged sintered products data；Production application shows pellet yield rate
Better than the yield rate for being vertically arranged sintering pellet, the horizontal sintering process of pellet is fully able to meet production requirement.
The pellet useful load in sintering boat can be improved 30% using horizontal sintering process, greatly improve sintering furnace product
Can, lower the energy consumption of specific yield, be conducive to energy-saving and emission-reduction；Molybdenum materials loss being reduced simultaneously, lowering polluting waste, reduction is produced into
This.The horizontal sintering process of pellet is stable, controlled, and product items physicochemical property is excellent, and high yield rate meets technology bar
Part and user require.
Brief description of the drawings
Fig. 1 is UO2 pellet outline drawings；
Fig. 2 is the horizontal state of UO2 pellets；
Fig. 3 is molybdenum V-type corrugated plating figure；
Fig. 4 is charging schematic diagram 1；
Fig. 5 is charging schematic diagram 2；
Fig. 6 is charging schematic diagram 3.
Specific embodiment
Below in conjunction with the accompanying drawings technical solution of the present invention is entered to describe in detail with specific embodiment.
A kind of UO2The method of pellet horizontal sintering in sintering furnace, it is characterised in that：Comprise the following steps：
(1) molybdenum boat and V shaped slab are determined
Using horizontal sintering still using original molybdenum boat for pushing away boat stove, the length of molybdenum boat is 260mm, and width is 134mm；
The requirement placed to meet horizontal sintering pellet places one piece of molybdenum V-type plate in the bottom of molybdenum boat, as shown in figure 3,
One piece of molybdenum V-type plate is placed in the bottom of molybdenum boat, and V-type plate is brought into close contact with molybdenum boat, and its thickness is 2mm；In the present embodiment, V-type plate
Material be molybdenum-lanthanum alloy, maximum operating temperature be 1800 DEG C.
9 V-shaped grooves are set in the centre position of V-type plate along molybdenum boat width, each spacing of V-groove is 14mm, V
The angle of shape groove is 90 °, using the arc transition structure of R=1mm between adjacent V-shaped groove, so completes pellet in green briquette
Good sintering atmosphere can be formed after stacking in boat between green briquette in boat, required for being conducive to reaching pellet
Sintered density and boat in density uniformity requirement.Molybdenum dividing plate is not used in addition to bottom corrugated plating in sintering boat, compares heap
Pile is vertically arranged sintering and alleviates sintering furnace promotes mainly resistance, reduces molybdenum materials consumption.
(2) parameter of pellet green compact is determined
As shown in figure 1, the pellet for using is cylindrical structure, adopted when pellet green compact are molded using the pellet of horizontal sintering
With green density (5.90-6.10) g/cm higher3Pellet green compact can be made has preferable intensity, can avoid perpendicular in pellet
It is horizontal state directly to fall down, and conveying, is put into damage during molybdenum boat.Therefore, choose its density for 5.90~
6.10g/cm3, highly it is 15.00~16.50mm, a diameter of 10.00mm, completion pellet is from vertical state to horizontal stroke after the completion of compacting
The conversion of configuration state, as shown in Figure 2；
(3) horizontal sintering dress boat technique is determined
As shown in figures 4-6, pellet loads molybdenum boat by the way of single file, and the bottom is placed pellet and existed line by line in molybdenum boat
In molybdenum corrugated plating V-groove, the bottom fills 9 row pellets, and then last layer fills 10 row pellets, and subsequent layers replace 9 rows, 10 luggages
Boat；Often row pellet is 15 pieces；The number of plies of the built-in pellet of molybdenum boat is 11~13.
In molybdenum corrugated plating V-groove place pellet when, pellet from be released to fall to V-groove distance be 4mm；
(4) horizontal sintering process is determined
Horizontal sintering uses continuous boat pushing formula sintering furnace, is stopped under conditions of being 1750 DEG C in sintering temperature 410 minutes
Production technology.
Claims (3)
1. a kind of UO2The method of pellet horizontal sintering in sintering furnace, comprises the following steps：
(1) molybdenum boat and V shaped slab are determined
The length of molybdenum boat is 260mm, and width is 134mm；
One piece of molybdenum V-type plate is placed in the bottom of molybdenum boat, V-type plate is brought into close contact with molybdenum boat, its thickness is 2mm；
9 V-shaped grooves are set in the centre position of V-type plate along molybdenum boat width, each spacing of V-groove is 14mm, V-shaped groove
Angle be 90 °, between adjacent V-shaped groove using R=1mm arc transition structure；
Characterized in that, further comprising the steps of：
(2) parameter of pellet green compact is determined
The pellet of use is cylindrical structure, and its density is 5.90~6.10g/cm3, highly it is 15.00~16.50mm, it is a diameter of
10.00mm, completes pellet from vertical state to the conversion of horizontal state after the completion of compacting；
(3) horizontal sintering dress boat technique is determined
Pellet loads molybdenum boat by the way of single file, and the bottom places pellet in molybdenum corrugated plating V-groove line by line in molybdenum boat,
The bottom fills 9 row pellets, and then last layer fills 10 row pellets, and subsequent layers replace 9 rows, 10 luggage boats；Often row pellet quantity is consolidated
It is fixed；In molybdenum corrugated plating V-groove place pellet when, pellet from be released to fall to V-groove distance be 4mm；
(4) horizontal sintering process is determined
Horizontal sintering uses continuous boat pushing formula sintering furnace, and the production of 410 minutes is stopped under conditions of being 1750 DEG C in sintering temperature
Technique.
2. a kind of UO as claimed in claim 12The method of pellet horizontal sintering in sintering furnace, it is characterised in that：V-type plate
Material is molybdenum-lanthanum alloy, and maximum operating temperature is 1800 DEG C.
3. a kind of UO as claimed in claim 12The method of pellet horizontal sintering in sintering furnace, it is characterised in that：Every row pellet
It is 15 pieces；The number of plies of the built-in pellet of molybdenum boat is 11~13.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410826307.7A CN105776336B (en) | 2014-12-26 | 2014-12-26 | A kind of UO2The method of pellet horizontal sintering in sintering furnace |
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| CN201410826307.7A CN105776336B (en) | 2014-12-26 | 2014-12-26 | A kind of UO2The method of pellet horizontal sintering in sintering furnace |
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| CN105776336A CN105776336A (en) | 2016-07-20 |
| CN105776336B true CN105776336B (en) | 2017-06-20 |
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| CN113023781A (en) * | 2019-12-24 | 2021-06-25 | 中核建中核燃料元件有限公司 | Preparation method of high-activity powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3632095A (en) * | 1968-10-04 | 1972-01-04 | United Nuclear Corp | Carrier for uranium oxide pellets |
| CN102007547A (en) * | 2008-04-16 | 2011-04-06 | 株式会社东芝 | Method for production of nuclear fuel pellet, fuel assembly, method for production of the fuel assembly, and uranium powder |
| CN103214231A (en) * | 2013-01-08 | 2013-07-24 | 上海核工程研究设计院 | Performance-modified oxide ceramic core body for thermal neutron reactor, and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101462738B1 (en) * | 2012-12-31 | 2014-11-17 | 한국원자력연구원 | Fission products capture Uranium dioxide nuclear fuel containing ceramic microcell and method of manufacturing the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3632095A (en) * | 1968-10-04 | 1972-01-04 | United Nuclear Corp | Carrier for uranium oxide pellets |
| CN102007547A (en) * | 2008-04-16 | 2011-04-06 | 株式会社东芝 | Method for production of nuclear fuel pellet, fuel assembly, method for production of the fuel assembly, and uranium powder |
| CN103214231A (en) * | 2013-01-08 | 2013-07-24 | 上海核工程研究设计院 | Performance-modified oxide ceramic core body for thermal neutron reactor, and preparation method thereof |
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