CN203862223U - Distribution plate for propylene epoxidation reaction - Google Patents
Distribution plate for propylene epoxidation reaction Download PDFInfo
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- CN203862223U CN203862223U CN201420219365.9U CN201420219365U CN203862223U CN 203862223 U CN203862223 U CN 203862223U CN 201420219365 U CN201420219365 U CN 201420219365U CN 203862223 U CN203862223 U CN 203862223U
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- distribution plate
- distribution grid
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Abstract
The utility model discloses a fluid distribution plate for propylene epoxidation reaction, and belongs to the field of chemical engineering devices. The fluid distribution plate comprises a disc-shaped distribution plate body and openings; the outer diameter of the disc-shaped distribution plate body is equal to the inner diameter of a reactor; the openings are formed in the distribution plate, and uniformly distributed in a plurality of circumferential lines which are concentric circles with the center of the distribution plate; the diameters of the openings are divided into at least four sections, and are sequentially progressive increased in the radial axial directions of the distribution plate from the center of the distribution plate to the edge of the distribution plate; in range of each section of the four sections, the diameter of the openings is equal; the opening intervals between the openings are not less than twice of the radius of the openings of the innermost ring. The distribution plate openings with variable-diameters at different sections are formed in the distribution plate, so that propylene in the fluid can be distributed uniformly, and then uniformly accesses the reactor; optimal fluid distribution can be obtained; uniform radial reaction of the reactor is avoided, so as to be convenient to control operation of the whole reactor; the fluid distribution plate can be widely used for the fields of design and manufacture of various propylene epoxidation reaction devices.
Description
Technical field
The utility model belongs to the general chemistry that carries out in the situation that having fluid and solid particle or the method device field used of physics, relates in particular to a kind of fluid distribution plate for oxidation reaction apparatus.
Background technology
It is that main reactor has fixed bed reactors, fluidized-bed reactor etc. taking propylene and hydrogen peroxide as raw material that propylene ring oxidation reaction (HPPO, hydrogene peroxide propylene oxide) is prepared expoxy propane.And this reaction need be dissolved in propylene in solvent by solvent methanol, thereby react with hydrogen peroxide.The required amount of solvent methanol is very big, is generally the more than 10 times of propylene consumption.In order to save the later separation cost of technique and the cost of methanol feedstock, the consumption of more existing process optimization solvent methanols, thereby can cause propylene to be present in reactant liquor with the form of bubble, how allow the uniform distribution of these bubbles be technological difficulties.
The reactor that existing HPPO technique is used has fluidized-bed reactor, calandria type fixed bed reactor etc.A kind of technique of carrying out HPPO reaction in fluidized-bed reactor has been invented by Solvay company.The fluid of this fluidized-bed reactor distributes district to contain one and can be used for the uniform of fluid for ensureing the mobile distributor of fluid well-distributing (distribution plate or grid), but catalyst is shorter the service life in fluidized-bed reactor.
The people such as G.Hans-Georg thinks in addition, and traditional shell-and-tube reactor with baffle plate exists the shortcoming such as fluid skewness, refrigerant pressure drop height.They have developed a kind of novel tube-shell type fixed bed reactor with helical configuration, but such fixed bed reactors manufacture process comparatively bothers, cost is also higher.
At present, more more traditional still calandria type fixed bed reactor of using in epoxidation of propylene technique.The general HPPO project of producing 200000 tons of expoxy propane per year, the diameter of its calandria type fixed bed reactor cylindrical shell is generally 3 meters of left and right, wherein comprises several thousand tubulations.How that allows fluid well-distributing that a so large reactor does and be distributed in each root tubulation is a technical difficult point.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of fluid distribution plate for propylene ring oxidation reaction, it by arranging the distribution plate orifices of segmentation reducing on distribution grid, propylene in fluid can be distributed uniformly, thereby enter uniformly in reactor, obtain optimum flow distribution, avoid reactor reaction radially inhomogeneous, thereby be convenient to control the operation of whole reactor.
The technical solution of the utility model is: a kind of fluid distribution plate for propylene ring oxidation reaction is provided, comprise the disc distribution plate body that external diameter is identical with reactor inside diameter and be positioned at the perforate on distribution grid, it is characterized in that: described perforate, is distributed on the described distribution grid center of circle and is on concentrically ringed multiple circumference; The diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections from the center of circle of distribution grid, increases progressively successively; In each segment limit of described four sections, the equal diameters of described perforate; The pitch of holes of perforate described in it, is at least the twice of innermost circle perforate radius.
Concrete, the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections, linear increment successively from the center of circle of distribution grid.
Or the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections from the center of circle of distribution grid, equal difference increases progressively successively.
Further, described in it, the thickness of slab of distribution grid is 10mm.
Further, the distribution grid described in it is single flow distribution grid.
Further, the reactor described in it at least comprises calandria type fixed bed reactor or fluidized-bed reactor.
Compared with the prior art, the utility model has the advantages that:
1. the opening diameter on distribution grid is outside along the center of circle of distribution grid, little in the middle of being, edge large, perforate is segmented into the segmentation variable-diameter structure relation of four sections, can make fluid flow more even, reduce reactor inside diameter to reaction inhomogeneous, make reactor operation more easy to control;
2. the open-celled structure that adopts segmentation reducing, can better make reactant propylene be distributed in solvent methanol comparatively uniformly, thereby can reduce the consumption of solvent, saves the cost of later separation workshop section;
3. this product manufactures comparatively easyly, uses safe and reliablely, can be used for the multiple reactor of propylene ring oxidation reaction, for example calandria type fixed bed reactor, fluidized-bed reactor.
Brief description of the drawings
Fig. 1 is the overall structure schematic diagram of the utility model distribution grid;
Fig. 2 be distribution grid from the center of circle partial structurtes zoomed-in view to edge;
Fig. 3 be fluid by the identical conventional distribution grid in perforate aperture after rate of flow of fluid along with distribution grid distribution schematic diagram radially;
Fig. 4 be after fluid passes through the utility model distribution grid rate of flow of fluid along with distribution grid distribution schematic diagram radially.
In figure, 1 is distribution plate body, and 2 is perforate, and 3 is the distribution grid center of circle, and r1 is the radius of innermost circle perforate, the pitch of holes that L1 is perforate.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described further.
In Fig. 1 and Fig. 2, the technical solution of the utility model provides a kind of fluid distribution plate for propylene ring oxidation reaction, comprise the disc distribution plate body 1 that external diameter is identical with reactor inside diameter and be positioned at the perforate 2 on distribution grid, perforate described in it, be distributed on the described distribution grid center of circle and be on concentrically ringed multiple circumference, the diameter of described perforate, along in described distribution grid longitudinal axis direction, from the center of circle of distribution grid to the edge of distribution grid, at least be divided into tetra-sections of R1, R2, R3, R4, increase progressively successively.
In each segment limit of tetra-sections of described R1～R4, the equal diameters of described perforate.
The pitch of holes L1 of perforate described in it, is at least the twice of innermost circle perforate radius r 1.
Concrete, the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections, linear increment successively from the center of circle of distribution grid.
Or the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections from the center of circle of distribution grid, equal difference increases progressively successively.
Further, in each described segment limit, the pitch of holes of described perforate is at least the twice of innermost circle perforate radius.
Described in it, the thickness of slab of distribution grid is 10mm.
Distribution grid described in it is single flow distribution grid.
Reactor described in it at least comprises calandria type fixed bed reactor or fluidized-bed reactor.
Utilize Fluid Mechanics Computation (Computational fluid dynamic, CFD) software ANSYS14.5 simplation verification, can find by little in the middle of bore dia, edge large, perforate is segmented into the distribution grid of four sections, can make the mobile more even of fluid.
When the fluid flow from charging aperture is 0.1213m
3/ s, when flow velocity is 2.5m/s, is 2300mm by a diameter, and after the identical distribution grid of perforate size, the flow velocity of its fluid along with distribution grid distribution radially as shown in Figure 3.As seen from the figure, from the center of distribution grid to edge, by fluid skewness after distribution grid, and be close to 0 at edge flow velocity, mean that border district almost passes through without fluid.
And same fluid by little in the middle of bore dia, edge large, perforate is segmented into after the distribution grid of four sections, the flow velocity of its fluid along with distribution grid distribution radially as shown in Figure 4.The distribution of visible fluid has obtained obvious improvement.
In the technical program, segmentation changes the structure of opening diameter, can obtain optimum flow distribution.Consider again in distribution grid pressure change vertically according to the flow distribution of aperture, perforate mode to the pre-distribution grid of charging is made following change: the opening diameter near center is reduced, along distribution grid radial direction from the center to blind end, pre-distribution grid is divided into four sections.Concrete opening diameter is determined according to reactor diameter.And simulate by Fluid Mechanics Computation, it is comparatively suitable that the diameter of four sections of perforates is linear change.Pitch of holes is made as 2 times of smallest aperture diameter and uses above safer in addition.
Embodiment:
Calandria type fixed bed reactor by the utility model for propylene ring oxidation reaction.
Propylene ring oxidation reaction device fluid flows from bottom to top.
This fluid distribution plate is installed on the bottom of reactor, is positioned at the below of support tube sheet and the catalyst supporting network of reactor.
It can carry out the fluid feed of propylene ring oxidation reaction device uniform, and reactant propylene is dissolved in solvent methanol uniformly.Thereby make reactor operation more easy to control, reduce the radially CONCENTRATION DISTRIBUTION of reactor.
Adopt calandria type fixed bed reactor of the present utility model to prepare expoxy propane for propylene ring oxidation reaction, its annual production is 200,000 tons.The design list of this reactor is as shown in table 1 below:
Table 1 reactor design list
Inlet stream amount is wherein as shown in table 2:
Table 2 Reactor inlet stream amount
| Molar flow (kmol/hr) | Import |
| H 2O | 1522.75 |
| H 2O 2 | 537.44 |
| C 3H 6 | 870.10 |
| C 3H 8 | 39.02 |
| CH 4O | 7420.00 |
The flow distribution of the design consideration aperture of its distribution grid considers again in distributor pipe pressure change vertically, perforate mode to the pre-distributor pipe of charging is made following change: the opening diameter near center is reduced, radially axis direction is divided into four sections from the center to blind end (being the edge of distribution grid) by pre-distributor pipe perforate, the concrete following Φ 24 that distributes of opening diameter, Φ 28, Φ 32, Φ 36, pitch of holes is 50mm.
Also distribution grid of the present utility model can be used for to the fluidized-bed reactor of propylene ring oxidation reaction, thereby it is more even that reactor inner fluid is flowed, and can also improve better heat transfer, mass transfer in reactor.
Because having adopted segmentation, distribution grid of the present utility model changes the structure of opening diameter, be convenient to the fluid feed of propylene ring oxidation reaction device to carry out uniform, contribute to reactant propylene to be dissolved in uniformly in solvent methanol, thereby make reactor operation more easy to control, the radially CONCENTRATION DISTRIBUTION that can reduce reactor, obtains optimum flow distribution.
The utility model can be widely used in the Design and manufacture field of various propylene ring oxidation reaction devices.
Claims (6)
1. for a fluid distribution plate for propylene ring oxidation reaction, comprise the disc distribution plate body that external diameter is identical with reactor inside diameter and be positioned at the perforate on distribution grid, it is characterized in that:
Described perforate, is distributed on the described distribution grid center of circle and is on concentrically ringed multiple circumference;
The diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, is at least divided into four sections from the center of circle of distribution grid, increases progressively successively;
In each segment limit of described four sections, the equal diameters of described perforate;
The pitch of holes of perforate described in it, is at least the twice of innermost circle perforate radius.
2. according to the fluid distribution plate for propylene ring oxidation reaction claimed in claim 1, it is characterized in that the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, be at least divided into four sections, linear increment successively from the center of circle of distribution grid.
3. according to the fluid distribution plate for propylene ring oxidation reaction claimed in claim 1, it is characterized in that the diameter of described perforate, along in described distribution grid longitudinal axis direction, to the edge of distribution grid, be at least divided into four sections from the center of circle of distribution grid, equal difference increases progressively successively.
4. according to the fluid distribution plate for propylene ring oxidation reaction claimed in claim 1, the thickness of slab that it is characterized in that described distribution grid is 10mm.
5. according to the fluid distribution plate for propylene ring oxidation reaction claimed in claim 1, it is characterized in that described distribution grid is single flow distribution grid.
6. according to the fluid distribution plate for propylene ring oxidation reaction claimed in claim 1, it is characterized in that described reactor at least comprises calandria type fixed bed reactor or fluidized-bed reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219365.9U CN203862223U (en) | 2014-04-30 | 2014-04-30 | Distribution plate for propylene epoxidation reaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219365.9U CN203862223U (en) | 2014-04-30 | 2014-04-30 | Distribution plate for propylene epoxidation reaction |
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| Publication Number | Publication Date |
|---|---|
| CN203862223U true CN203862223U (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420219365.9U Expired - Fee Related CN203862223U (en) | 2014-04-30 | 2014-04-30 | Distribution plate for propylene epoxidation reaction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106345376A (en) * | 2016-09-14 | 2017-01-25 | 中国海洋石油总公司 | Gas distributing device for fluidized beds |
| CN111022813A (en) * | 2019-12-03 | 2020-04-17 | 四川大学 | Porous current-limiting noise-reducing pore plate and current-limiting noise reducer formed by same |
| CN111330519A (en) * | 2020-03-17 | 2020-06-26 | 唐山海港德泰新材料技术有限公司 | Fluid distributor, preparation method and application thereof |
-
2014
- 2014-04-30 CN CN201420219365.9U patent/CN203862223U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106345376A (en) * | 2016-09-14 | 2017-01-25 | 中国海洋石油总公司 | Gas distributing device for fluidized beds |
| CN106345376B (en) * | 2016-09-14 | 2019-02-19 | 中国海洋石油集团有限公司 | A kind of fluidized bed distribution device in gas-fluid |
| CN111022813A (en) * | 2019-12-03 | 2020-04-17 | 四川大学 | Porous current-limiting noise-reducing pore plate and current-limiting noise reducer formed by same |
| CN111022813B (en) * | 2019-12-03 | 2021-08-03 | 四川大学 | Porous current-limiting noise-reducing pore plate and current-limiting noise reducer formed by same |
| CN111330519A (en) * | 2020-03-17 | 2020-06-26 | 唐山海港德泰新材料技术有限公司 | Fluid distributor, preparation method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20190430 |