CN106925189A - One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction - Google Patents
One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction Download PDFInfo
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- CN106925189A CN106925189A CN201511016695.3A CN201511016695A CN106925189A CN 106925189 A CN106925189 A CN 106925189A CN 201511016695 A CN201511016695 A CN 201511016695A CN 106925189 A CN106925189 A CN 106925189A
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- cone
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- cap
- distribution grid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/26—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1818—Feeding of the fluidising gas
- B01J8/1827—Feeding of the fluidising gas the fluidising gas being a reactant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00796—Details of the reactor or of the particulate material
- B01J2208/00893—Feeding means for the reactants
- B01J2208/00911—Sparger-type feeding elements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The invention belongs to uranium transformation technology field, and in particular to one kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction.The apparatus main body is distribution grid, and distribution grid is made up of metallic plate and cone cap, and several cone caps are provided with metallic plate, and cone cap is connected through a screw thread with metallic plate, and cone cap is provided with side opening, and cone crown face is in cone.Described distribution grid is fixed on cone air chamber top.Described distribution grid selects the materials of Monel 400.The present invention, in certain rational scope, is conducive to the fluohydric reaction of subsequent material depth effectively the control of hydrofluorination rate, greatly improves product percent of pass, while stable, continuous, maintenance period is long, and large-scale production intensity is high, and economic serviceability is good.
Description
Technical field
The invention belongs to uranium transformation technology field, and in particular to one kind is used for UO2The HF gas of hydrofluorination reaction
Body distribution apparatus.
Background technology
In dry production UF4In technique, two-stage series adverse current fluid bed hydrofluorination technique is most widely used,
Its outstanding advantages has：1. the fluidizing agent of one-level bed is steam-laden hydrogen fluoride gas, is made at the beginning of in one-level bed
The hydrofluorination reaction of phase tends to gentle, by the smooth derivation beneficial to reaction heat；2. the reaction temperature at hydrofluorination initial stage
Degree can take the methods such as the conversion ratio distribution ratio or feed rate between regulation two to achieve effective control；③
The distribution of hydrogen fluoride concentration gradient, solid phase in good hydrofluorination reaction temperature gradient distribution, gas phase can be set up to turn
Rate gradient is distributed, and gas-particle two-phase contact is good.
Solids fluidized general principle：In a fluidized bed body, a certain amount of of addition intermittently or serially
Particulate solid material, control gas is passed through from bottom to top with certain speed from bed bottom, and gas flows through material and formed
Bed, when gas velocity reaches certain value, solid particle can freely suspend in the gas flow relatively, present
Go out the state of similar fluidised form, this state is referred to as fluidization.
In bed operating is fluidized, in order to prevent one-level bed material particles glutinous poly-, local reaction temperature is too high, makes
The bad phenomenon of the even dead bed of poor fluidization is caused into caking, sintering etc., it is desirable to from the mixing that secondary bed comes
Gas into one-level bed after to have gas velocity higher, in order to effectively allow one-level bed reaction mass fully flow
Change, be uniformly distributed reaction temperature.
The content of the invention
It is used for UO it is an object of the invention to provide one kind2The HF distribution device in gas-fluid of hydrofluorination reaction, should
Rationally, percent opening is suitable, easy to operate for apparatus structure, realize fluidizing gas be uniformly distributed in reactor and
Preferable operating gas velocity, creates fluidization quality in good bed, it is to avoid dead band, slugging, channel are produced in bed
Etc. bad fluidisation phenomenon, it is ensured that it is safe, continuous, steady that uranium dioxide hydrofluorination prepares green salt process system
Fixed operation, effectively improves green salt production efficiency.
To reach above-mentioned purpose, the technical solution used in the present invention is：
One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, the apparatus main body is distribution grid, point
Fabric swatch is made up of metallic plate and cone cap, and several cone caps are provided with metallic plate, and cone cap passes through spiral shell with metallic plate
Line is connected, and cone cap is provided with side opening, and cone crown face is in cone.
Described distribution grid is fixed on cone air chamber top.
Described cone air chamber is connected with bed body using flange, and uses copper band packing seal.
Described distribution grid selects the materials of Monel 400.
Described cone air chamber selects the materials of Monel 400.
Described distribution grid appearance and size isPercent opening is 0.7%~0.8%, totally 187 three kinds
The different cone cap composition in aperture, aperture gradually reduces by distribution grid outside to inside, and each cone cap side has six
Nozzle.
Described cone cap aperture footpath is respectivelyWhereinCone cap quantity 96
Individual,Cone cap quantity 54,Cone cap quantity 37, integrally into grade hexagon distribution, by
Outer extremely interior, the 1st, 2,3 circles areCap is bored, 4,5 circles areCone cap, remaining is
Cone cap, cone cap spacing is 30mm.
Invention is acquired to be had the beneficial effect that：
The present invention introduce distribution device in gas-fluid can with one-level bed height synergism, except can solve the above
Outside described problem, in certain rational scope, can be conducive to follow-up with effectively the control of hydrofluorination rate
The fluohydric reaction of material depth, greatly improves product percent of pass, at the same it is stable, continuous, safeguard week
Phase is long, and large-scale production intensity is high, and economic serviceability is good.The present invention has simple structure, process operation can
By, maintenance is convenient, fluid effect is good the advantages of.
(1) relatively concentrated during air-flow blowout cone cap, the material from cone cap farther out can be blown.And the gas of latasuture formula
Stream may just go out gap not far with regard to upflow fluidization in flow velocity hour.Although so at blast cap surrounding distribution grid
Blow more loose, but the place from blast cap farther out, it is possible to do not blown afloat by air-flow.(2) apparatus structure is simple.
Its agent set gas distribution grid is made up of Monel metallic plate and cone cap, is integrally attached to a cone air chamber
Top.Cone cap is fixed with metallic plate by screw socket, and metallic plate is mainly fixes supporting role, cone to material device
Cap completes shunting and the distributed function of gas；(3) in side open pore, top surface is in cone to device cone cap,
There is protective effect to stomata, in the process of running, thing will not be caused because of adjusting gas flow or other factors
Material sedimentation is by air-hole blockage, it is to avoid partial fluidised, the dead bed state in part, it is ensured that distribution grid continuously runs
Stability, maintenance period is long, and large-scale production intensity is high, and economic serviceability is good.(4) distribution grid is realized
Modularized design, cone cap compact in design is concentrated, and the device is convenient to be overhauled, and is easy to personnel's disassembly, cleaning to install.
(5) the device fluid effect is good.Reasonable layout of the present invention bores size between cap, cone cap, from inside to outside according to gas
Flow distribution using three kinds of sizes cone caps shuntings, the active balance gas flow and stream of each position of distribution grid
Speed, ensure that air-flow is uniform to greatest extent, and fluidization quality is high, and in running, overall fluid effect is good,
Do not occur by dead bed caused by distribution grid reason and other bad fluidized status.
Brief description of the drawings
Accompanying drawing 1：Cone cap and distribution grid layout drawing；
Accompanying drawing 2：Cone cap and distribution grid connected mode figure；
Accompanying drawing 3：Latasuture formula bores cap；
Accompanying drawing 4：Improve the empty formula cone cap figure of rear side；
The distribution device in gas-fluid structure chart of accompanying drawing 5；
In figure：1st, distribution grid；2nd, metallic plate；3rd, cap is bored；4th, side opening.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As Figure 1-Figure 5, the apparatus main body is distribution grid 1, and distribution grid 1 is by metallic plate 2 and cone cap 3
Constitute, several cone caps 3 are installed on metallic plate 2, cone cap 3 is connected through a screw thread with metallic plate 2, bores cap
3 are provided with side opening 4, and cone cap 3 top surface is in cone.
(1) performance requirement
The effect of distribution grid 1 is solid material in supporting bed, and fluidizing gas is uniformly entered bed material,
The structure type of distribution grid 1 is more, for UO2For hydrofluorination, solid particle very little, appropriate configuration
The selection of distribution grid 1 is even more important, and determines the fluidization quality and continuous performance of whole line production system, steady
Qualitative energy.To ensure that gas uniformly injects bed, and dead angle present on distribution grid 1 is eliminated, distribution grid 1
Design have sufficiently large exit velocities when should pass the gas through air holes, disorderly outgoing orientation is beneficial to
Cause the violent turbulence of gas in bed bottom.
Gas distribution grid 1 possesses following performance：
A. there is the effect for being uniformly distributed air-flow, while its pressure drop is small.
B. fluid bed can be made a good initial fluidized state, it is to avoid form dead angle.
C. it is difficult to be abraded or block in operating process.
(2) material selection
This technique fluidizing gas is HF, is a kind of extremely strong corrosive agent, is easily reacted with common metal, water
Presence can accelerated corrosion speed, except with aqueous hydrogen fluoride in itself have bigger corrosivity in addition to, also as fluorine
Change hydrogen to having reacted autocatalysis.To ensure the service life of gas distribution grid, common metal material is difficult to
Adapt to.It is that gold, platinum, silver, nickel and nickel-base alloys, such as English section nickel and Monel are closed to the most stable of metals of HF
Gold etc..Compare in the market has an alloys of Monel 400 extensively using with HF industries, be it is a kind of seawater,
Chemical solvent, the material with good corrosion resistance especially under hydrofluoric medium environment, while it has
Good mechanical performance, widely uses temperature from low temperature to high temperature, with good welding performance and middle and high
Intensity, completely can be as the optimal material of HF distribution device in gas-fluid selection.In view of the deep-etching of hydrogen fluoride
Property and exothermic heat of reaction, material must corrosion-resistant, high temperature resistant, intensity will height, gas distribution grid 1 and cone gas
Room is all from the materials of Monel 400.Shunting thing in cone air chamber uses copper wire, bar, good stability.
(3) apparatus structure and size design
Gas distribution grid 1 is the surprisingly important component of fluid bed main body, and the Main Function in fluid bed is equal
Even distributing gas, to create a good initial fluidization conditions, and guarantee prevents abnormal stream in operation
The generation of change, it is ensured that active fluidization quality.Distribution grid 1 will have rational outgoing perforation size and pitch of holes,
Make its resistance to gas in certain scope, preferably equal to the 10% of pressure drop of column.According to fluid force
Learn, be directly proportional to square of flow velocity by the pressure drop of distribution grid 1, the small change of flow velocity can cause partial drop of pressure
Large change, to gas distribution uniformity for, the pressure drop of distribution grid 1 is a favorable factor.Distribution
The resistance of plate 1 is bigger, and the ability for suppressing bed interior instability is bigger, and air flow method is also more uniform.Distribution
The pressure drop of plate 1 depends mainly on percent opening, and the distribution grid fluidizing stability of large opening rate low pressure drop is poor, and low
Percent opening, high pressure drop obtains distribution grid and is conducive to setting up good fluidization conditions.Production UF4Fluid bed used point
Fabric swatch, general percent opening is 1% or so.
According to bed body size needs, the appearance and size of gas distribution grid 1 is consistent with bed body entrance opening dimension, isAccording to percent opening design in 0.7%~0.8% design, perforate 187.Gas distribution grid 1 is
Side opening bores the distribution grid of cap 3, and, in cone, distribution grid 1 is by totally 187 three kinds of aperture differences for cone cap 3 top surface
Cone cap 3 constitute, aperture gradually reduces by distribution grid 1 outside to inside, and there are six sprays each cone cap 3 side
Mouth.The cone aperture design of cap 3 has three kinds of different sizes, respectivelyWherein96, cap of cone,54, cap of cone,Cone 37, cap, overall distribution into wait hexagon
Distribution, from outside to inside, the 1st, 2,3 circles areCone cap 3,4,5 encloses and isCone cap 3, remaining
ForCone cap 3.The cone spacing of cap 3 about 30mm；The percent opening of distribution grid of the present invention 1 is 0.729%,
Percent opening can make the distribution grid have more preferable operational suitability below 1%, it is ensured that benign fluidisation.
(4) design of connected mode
Distribution grid 1, cone air chamber are connected by flange and are connected with bed body, it is desirable to which its sealing is close using copper band filler
Envelope.Cone cap 3 is used with the fixed form of distribution grid 1 and is screwed.Gas is set up according to above-mentioned requirements to be distributed
Device, carries out correlation test, and sampling analysis tail gas, product quality, composition.Specific embodiment is as follows
It is described：
1st, device is installed.According to test requirements document, distribution device in gas-fluid is connected into hydrofluorination production technology is carried out
Pilot production；2nd, the sealing for checking it to connect.Nitrogen is passed through to suppress using bubble method to device system
System airtight test；3rd, after system intensification debugging is qualified.Bed material is added, first nitrogen fluidisation controls flow
In 15~20m3/h；After fresh feed is entered in system, system is adjusted, lead to HF fluidisations, period observation note
Pressure under record gas distribution grid, bed pressure difference, according to bed temperature and tail gas acidity analysis adjustment HF flows；
4th, product quality analysis.According to production status, take a sample per 500kg products carries out composition analysis to it,
It is required that UO2+UO2F2Content is less than 8%；Using said apparatus, hydrofluorination cone cap 3 gas distribution is obtained
The runnability of plate 1 and operating parameter, can be smoothed out hydrofluorination production, demonstrate the distribution device in gas-fluid
Feasibility and reliability.
Claims (7)
1. it is a kind of to be used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is characterised in that：Device master
Body is distribution grid (1), and distribution grid (1) is made up of metallic plate (2) and cone cap (3), metallic plate (2)
On be provided with several cone cap (3), cone cap (3) be connected through a screw thread with metallic plate (2), bore cap (3)
Side opening (4) is provided with, cone cap (3) top surface is in cone.
2. according to claim 1 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described distribution grid (1) is fixed on cone air chamber top.
3. according to claim 2 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described cone air chamber is connected with bed body using flange, and uses copper band packing seal.
4. according to claim 1 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described distribution grid (1) selects the materials of Monel 400.
5. according to claim 2 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described cone air chamber selects the materials of Monel 400.
6. according to claim 1 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described distribution grid (1) appearance and size isPercent opening is 0.7%~0.8%, altogether
Different cone cap (3) composition in 187 three kinds of apertures, aperture gradually reduces by distribution grid (1) outside to inside,
There are six nozzles each cone cap (3) side.
7. according to claim 6 for UO2The HF distribution device in gas-fluid of hydrofluorination reaction, it is special
Levy and be：Described cone cap (3) aperture is respectivelyWhereinCone
Cap (3) quantity 96,Cone cap (3) quantity 54,Cone cap (3) quantity 37,
Into hexagon distribution is waited, from outside to inside, the 1st, 2,3 circles are entiretyCap (3) is bored, 4,5 circles areCone cap (3), remaining isCone cap (3), cone cap (3) spacing is 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016695.3A CN106925189A (en) | 2015-12-29 | 2015-12-29 | One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016695.3A CN106925189A (en) | 2015-12-29 | 2015-12-29 | One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction |
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| Publication Number | Publication Date |
|---|---|
| CN106925189A true CN106925189A (en) | 2017-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511016695.3A Pending CN106925189A (en) | 2015-12-29 | 2015-12-29 | One kind is used for UO2The HF distribution device in gas-fluid of hydrofluorination reaction |
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| CN (1) | CN106925189A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109925978A (en) * | 2017-12-18 | 2019-06-25 | 中核四0四有限公司 | A kind of denitration fluidized bed fluidized gas distribution and device for discharging |
| CN111228103A (en) * | 2020-01-14 | 2020-06-05 | 上海理工大学 | Hand skin care instrument based on fluidized bed principle |
| CN114643025A (en) * | 2020-12-18 | 2022-06-21 | 中核四0四有限公司 | Novel uranium dioxide hydrofluorination two-stage full-countercurrent series fluidized bed system |
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| CN203959848U (en) * | 2014-06-26 | 2014-11-26 | 攀枝花市钛都化工有限公司 | Acidolysis pot gas distribution grid |
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2015
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Patent Citations (5)
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| US3941868A (en) * | 1973-02-24 | 1976-03-02 | Georg Fischer Aktiengesellschaft | Method of removing exhaust gases from plastic binded sand molds |
| JPH04227040A (en) * | 1990-06-18 | 1992-08-17 | Exxon Res & Eng Co | Improved interband mixing device |
| KR20000040929A (en) * | 1998-12-21 | 2000-07-15 | 이구택 | Gas dispersing plate of fludized bed furnace |
| CN1481930A (en) * | 2002-12-17 | 2004-03-17 | 中国石油化工股份有限公司 | Fluidized bed reactor gases distributing plate |
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| Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109925978A (en) * | 2017-12-18 | 2019-06-25 | 中核四0四有限公司 | A kind of denitration fluidized bed fluidized gas distribution and device for discharging |
| CN111228103A (en) * | 2020-01-14 | 2020-06-05 | 上海理工大学 | Hand skin care instrument based on fluidized bed principle |
| CN114643025A (en) * | 2020-12-18 | 2022-06-21 | 中核四0四有限公司 | Novel uranium dioxide hydrofluorination two-stage full-countercurrent series fluidized bed system |
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Application publication date: 20170707 |