CN2649171Y - Fluidized bed reaction unit - Google Patents
Fluidized bed reaction unit Download PDFInfo
- Publication number
- CN2649171Y CN2649171Y CN 03229169 CN03229169U CN2649171Y CN 2649171 Y CN2649171 Y CN 2649171Y CN 03229169 CN03229169 CN 03229169 CN 03229169 U CN03229169 U CN 03229169U CN 2649171 Y CN2649171 Y CN 2649171Y
- Authority
- CN
- China
- Prior art keywords
- distribution grid
- air intake
- admission line
- fluidized bed
- bed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 42
- 238000009826 distribution Methods 0.000 claims description 56
- 239000012530 fluid Substances 0.000 claims description 28
- 239000007921 spray Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 10
- 230000008021 deposition Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000004581 coalescence Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 238000010008 shearing Methods 0.000 abstract 1
- 230000008674 spewing Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 4
- 229920001684 low density polyethylene Polymers 0.000 description 4
- 239000004702 low-density polyethylene Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011951 cationic catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011953 free-radical catalyst Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Landscapes
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The present utility model discloses a fluidized-bed reactor, including an extended section at the upper end of the reactor, a straight cylinder reaction part of the reactor, a gas distributor, a gas mixing chamber. One or more air inlet pipes with side tangential circle are arranged at the bottom of the straight cylinder reaction part of the reactor above the gas distributor. Or an air intake loop is provided above the gas distributor and along the external diameter thereof. The distributor with big opening ratio in the center region and small opening ratio at the edge feeds air at a proper ratio together with the air intake loop and makes material in bed fluidized. The advantages of the utility model: 1) Lateral disturbance inside the fluidized bed is strengthened by the side tangential circle air intake or the internal air intake loop, thus making axial and vertical gas-solid mixing more even. 2) Lateral shearing reduces the size of the bubble, destroys coalescence and growth of the bubble, stabilizes the layer, avoids spewing and improves the safety and stability. 3) Due to local vortex produced by the side tangential circle air intake or the internal air intake loop inside the bed and prevention of large solid particles deposition by large amount of air intake in the center of the distributor, heat, mass transfer are strengthened during the reaction process, reaction yield is improved.
Description
Technical field
The utility model relates to a kind of fluidized bed reaction.
Background technology
Distribution grid is an important component part of industrial fluidized bed equipment.Though it is to only 0.2～0.3 meter of the direct sphere of action in whole fluid bed ground, yet it all has decisive influence to the fluidisation attitude quality of whole fluid bed and the operating characteristics of reaction unit.Specifically, the distribuor of fluidized bed role comprises:
1) stream with uniform distribution body makes fluid pass through the energy consumption minimum of distribution grid simultaneously.This can be by regulating distribution grid percent opening or the ratio of anode drop and bed pressure drop, and select suitable pre-distribution means to realize.
2) guarantee near distribution grid to form good gas-solid contact condition,, thereby eliminate the dead band so that all particles all are kept in motion.This can regulate by structure and the operating parameter of selecting distribution grid.
3) the not blocked and corrosion of distribution grid, the exercisable cycle is long, makes especially in operating process or after unexpected shut-down operation, and solids can not backflow among the air chamber under the distribution grid
The distributing plate structure that fluid bed uses in the prior art is comparatively simple, main portions is a stephanoporate steel plate, be drilled with a plurality of apertures according to actual production on the plate, and by triangular arranged, level is covered with one section angle steel on each aperture, so polylith angle steel cross arrangement is arranged on the plate, makes air-flow along the dead band of distribution grid level ejection, and prevent that particle from falling under the plate may occur on the elimination plate.
Yet, find that this distribution grid when actual production, has following deficiency by our operating practice for many years to the fluidized bed reaction that generally adopts this distribution grid:
1) because tolerance is certain, blast cap horizontal-jet mouth is too big, it is not enough to cause spraying gas speed, the sphere of action of each blast cap on distribution grid is limited, this just is difficult to guarantee that bulky grain does not deposit onboard, and anti-deposition capability is not strong, can't form one deck air film on the distribution grid surface, can't allow the fluidisation material react, influence the raising of reaction yield at air film.
2) in the general fluid bed, adopt traditional distribution grid, the horizontal mixing of the interior solid material of bed body is poor, and the heat and mass ability influences fluidization quality, causes hot-spot in the fluid bed easily, causes the generation of reuniting.
3) in the general fluid bed, adopt traditional distribution grid, bed body border area is owing to distribution grid project organization problem and edge effect, and the goods fluid of border area is second-rate.
4) in the prior art for distribution grid, the production flexibility is relatively poor.
For this reason, the utility model is transformed the structure of distribution grid, actual operating position proves that side of the present utility model circle of contact admission line/built-in air inlet endless tube has overcome the above-mentioned deficiency of prior art distribution grid fully, improved the anti-deposition capability of distribution grid, overcome the deficiency of laterally mixing difference in the general fluid bed, strengthened laterally disturbance in the bed, stablized bed, the operation that makes fluid bed stablize high yield under " condensation mode " and " supercool coagulates pattern " method of operating has increased the security of device.
Summary of the invention
The purpose of this utility model provides a kind of fluidized bed reaction.
It comprises expanding reach, the straight tube of reaction unit reactive moieties, gas distribution grid, the gas mixer chamber of reaction unit upper end, above gas distribution grid, the straight tube of reaction unit reactive moieties bottom is provided with one or more sides circle of contact admission line, or the air inlet endless tube of above distribution grid, arranging along its external diameter, big with the central area percent opening, the little distribution grid of border area percent opening air inlet according to a certain percentage jointly makes an interior goods fluid.
Air deflector of the present utility model has been compared the following advantage with the air deflector of prior art:
1) air inlet of the side circle of contact or built-in air inlet endless tube have been strengthened the horizontal disturbance of fluid bed inside, have overcome general fluid bed solid particle and have laterally mixed poor deficiency, and an interior gas-solid is blended in axially with vertically more even.
2) by lateral shear the size of bubble is reduced, destroy the merging of bubble and grow up, stablize bed, avoid gushing, improved the security and the stability of device.
3) air inlet of the side circle of contact or built-in air inlet endless tube produce local vortex in fluid bed, and the big air inflow of distribution grid central area has prevented the deposition of big solid particle, has strengthened the heat transfer in the course of reaction, mass transfer, have improved the productive rate of reaction.
4) in the prior art for distribution grid, the production flexibility is relatively poor, and the tolerance that the utility model can be by regulating distribution grid and side circle of contact air inlet or built-in air inlet endless tube reaches flexibility, Flexible Production than heat transfer, mass transfer in the control course of reaction.
Description of drawings
Fig. 1 is fluid bed cross-section elevation and vertical view;
Fig. 2 is fluidized bed reaction distribution grid profile and vertical view.
The specific embodiment
Fluidized bed reaction comprises expanding reach 1, the straight tube of reaction unit reactive moieties 2, gas distribution grid 3, the gas mixer chamber 4 of reaction unit upper end, above gas distribution grid 3, the straight tube of reaction unit reactive moieties 2 bottoms are provided with two or more side circle of contact admission lines 6, or the air inlet endless tube of above distribution grid 3, arranging along its external diameter 7, make an interior goods fluid with distribution grid 3 common air inlets.
Side circle of contact admission line 6 equidistantly stretches in the fluid bed along circumference, and the admission line shape can be for circular, square, the mouth of pipe equivalent diameter D of admission line
iWith distribution grid 3 diameter D
0Size relationship be: D
i/ D
0=0.05～0.2, wherein with D
i/ D
0=0.1 is good; Admission line spray into height H
iWith the straight tube of reaction unit reactive moieties 2 height H
0Size relationship be: H
i/ H
0=0.05～0.4, wherein with H
i/ H
0=0.08 is good; Angle α=15 of the tangent line at admission line and its place °～60 ° ° are good with α=30 wherein.
The top and inboard circular hole, the square hole of opening more than four and four of the air inlet endless tube of arranging along distribution grid 3 external diameters 7, aperture D
jWith distribution grid 3 diameter D
0Size relationship be: D
j/ D
0=0.005～0.2.
Distribution grid 3 percent openings are 1%～5%, and the percent opening of distribution grid 3 central areas is higher than the distribution grid border area.
The air inflow of side circle of contact admission line or circulating line accounts for 10%～70% of total air inflow, is good to account for 30% of total tolerance wherein; Tolerance by distribution grid 3 accounts for 30%～90% of total air inflow, is good to account for 70% of total tolerance wherein.
The air-flow of side circle of contact admission line or circulating line enters the flow field that has changed in the fluid bed in the fluid bed, under the acting in conjunction of distribution grid air inlet, solid particle rises along fluid bed near wall region spiral, and in the distribution grid influence area, solid particle is a helical flow clearly, horizontal velocity increases, and seldom sees bubble.In the fluid bed central area, because the big solid particle of turning effort sinks at the middle part, so high opening rate at distribution grid middle part, high air inflow has prevented the sedimentation of solid particle, formed a zone that inner rotation is risen in the central area, any material in the entire reaction device space on the distribution grid is realized more perfect mixing, and does not stay any dead angle, thereby improves reaction yield.
That side circle of contact air inlet that the utility model is used or endless tube intake method are applicable to is gas-solid fluidized bed, gas-liquid fluid bed, gas-liquid are solid fluid bed.
The used catalyst of the utility model comprises: coordination anion catalyst, cationic catalyst, free radical catalyst.And comprise filter component or metallocene and bimodal product catalyst.
Embodiment
The Unipol fluidized-bed olefin polymerization reaction unit that employing is introduced from connection carbon, side of the present utility model circle of contact admission line or annular intake pipe road as illustrated in fig. 1 and 2 installed in its bottom.Under condensation mode, operate, produce low density polyethylene (LDPE).
1. low density polyethylene (LDPE) product service data
Reaction raw materials: ethene, 1-butylene, hydrogen
Recycle flow: 1.5*10
6Kg/hr
Space-time yield: 134.8kgPE/m
3* hr
2. move 6 months situation continuously:
The recycle stream stability of flow, the ripple disable phenomenon, reaction unit is stable.
Method by sonic detection, minority reaction mass collision alarm is only arranged on distribution grid, periodically stabilization signal is arranged on the fluid bed wall, show in the fluid bed bottom to form one deck air film, material on the air film all is in Periodic Rotating ascending motion state, and the resin bed fluidized state is good.
3. move the inspection situation after 12 months continuously.
Situations such as no heat seal powder and knot sheet, no powder deposition, adhesion on the distribution grid and the annular intake pipe road, very cleaning reaches the metallic luster level.
The hole of 2077 φ 16mm does not have obstruction on the distribution grid.
Reaction unit parameter: direct tube section height 14.3m, equidistantly open six tangential spouts along circumference, nozzle diameter is 0.5m, angle α=30 of the tangent line at admission line and its place °, and the height that sprays into of admission line is being higher than 0.3m place above the distribution grid, distribution grid is a stephanoporate steel plate that diameter is 5.2m, thickness is 12.5mm, opens the hole of 2077 φ 16mm, and percent opening is 2.73%, inhomogeneous perforate, central area are slightly close.
The result shows and uses fluidized bed plant of the present utility model not observe the operational issue of production run and to the adverse effect of product, in that guarantee under the constant condition of circulating flow rate all can safe and stable operation, on distribuor of fluidized bed, form one deck air film, eliminated dead hole, the dead band, the cycle of fluid bed steady production improves, the size of bubble reduces, destroying the merging of bubble grows up, stablize bed, avoid gushing, improved the security and the stability of device, prevented the deposition of big solid particle, strengthened the heat transfer in the course of reaction, mass transfer has improved the productive rate of reaction, reaches flexibility, the purpose of Flexible Production.
Claims (5)
1. fluidized bed reaction, it is characterized in that it comprises expanding reach (1), reaction unit straight tube reaction plate (3) top of reaction unit upper end, reaction unit straight tube reactive moieties (2) bottom is provided with two or more side circle of contact admission lines (6), or the air inlet endless tube of arranging along its external diameter in gas distribution grid (3) top (7), make an interior goods fluid with the common air inlet of distribution grid (3).
2. a kind of fluidized bed reaction according to claim 1 is characterized in that said side circle of contact admission line (6) equidistantly stretches in the fluid bed along circumference, and admission line is shaped as circle, square, the mouth of pipe equivalent diameter D of admission line
iWith distribution grid (3) diameter D
0Size relationship be: D
i/ D
0=0.05～0.2, admission line spray into height H
iWith the straight tube of reaction unit reactive moieties (2) height H
0Size relationship be: H
i/ H
0=0.05～0.4, angle α=15 of the tangent line at admission line and its place °～60 °.
3. a kind of fluidized bed reaction according to claim 2 is characterized in that the mouth of pipe equivalent diameter D of said side circle of contact admission line
iWith distribution grid (3) diameter D
0Size relationship be: D
i/ D
0=0.1, admission line spray into height H
iWith the straight tube of reaction unit reactive moieties (2) height H
0Size relationship be: H
i/ H
0=0.08, angle α=30 of the tangent line at admission line and its place °.
4. a kind of fluidized bed reaction according to claim 1 is characterized in that top and inboard circular hole, the square hole of opening more than four and four at said air inlet endless tube (7), aperture D
jWith distribution grid (3) diameter H
0Size relationship be: D
j/ D
0=0.005～0.2.
5. a kind of fluidized bed reaction according to claim 1 is characterized in that said distribution grid (3) percent opening is 1%～5%, and the percent opening of distribution grid (3) central area is higher than the distribution grid border area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229169 CN2649171Y (en) | 2003-02-26 | 2003-02-26 | Fluidized bed reaction unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229169 CN2649171Y (en) | 2003-02-26 | 2003-02-26 | Fluidized bed reaction unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2649171Y true CN2649171Y (en) | 2004-10-20 |
Family
ID=34326095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03229169 Expired - Fee Related CN2649171Y (en) | 2003-02-26 | 2003-02-26 | Fluidized bed reaction unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2649171Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744019A (en) * | 2012-07-12 | 2012-10-24 | 北京国电清新环保技术股份有限公司 | Novel gas-solid dual phase moving bed device |
| CN109967004A (en) * | 2019-03-12 | 2019-07-05 | 叶涵辰 | A kind of fluidized-bed reactor of augmentation of heat transfer |
| CN110496573A (en) * | 2019-09-11 | 2019-11-26 | 哈尔滨理工大学 | A kind of dock fluidized-bed reactor |
| CN111565856A (en) * | 2018-08-24 | 2020-08-21 | Lg化学株式会社 | Dispersion plate and coating apparatus including the same |
| CN112304031A (en) * | 2020-11-12 | 2021-02-02 | 哈尔滨工业大学 | Cyclone fluidized bed dryer for rapidly drying large-particle materials |
| CN115046728A (en) * | 2022-05-12 | 2022-09-13 | 台州学院 | Device and method for measuring bubble coalescence and breakage events of straight pipe air flow distributor of gas-liquid biological bubbling fluidized bed |
| US12042776B2 (en) | 2018-08-24 | 2024-07-23 | Lg Chem, Ltd. | Dispersion plate and coating device including same |
-
2003
- 2003-02-26 CN CN 03229169 patent/CN2649171Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744019A (en) * | 2012-07-12 | 2012-10-24 | 北京国电清新环保技术股份有限公司 | Novel gas-solid dual phase moving bed device |
| CN102744019B (en) * | 2012-07-12 | 2014-12-10 | 北京国电清新环保技术股份有限公司 | Novel gas-solid dual phase moving bed device |
| CN111565856A (en) * | 2018-08-24 | 2020-08-21 | Lg化学株式会社 | Dispersion plate and coating apparatus including the same |
| US12042776B2 (en) | 2018-08-24 | 2024-07-23 | Lg Chem, Ltd. | Dispersion plate and coating device including same |
| CN109967004A (en) * | 2019-03-12 | 2019-07-05 | 叶涵辰 | A kind of fluidized-bed reactor of augmentation of heat transfer |
| CN110496573A (en) * | 2019-09-11 | 2019-11-26 | 哈尔滨理工大学 | A kind of dock fluidized-bed reactor |
| CN112304031A (en) * | 2020-11-12 | 2021-02-02 | 哈尔滨工业大学 | Cyclone fluidized bed dryer for rapidly drying large-particle materials |
| CN112304031B (en) * | 2020-11-12 | 2022-03-01 | 哈尔滨工业大学 | Cyclone fluidized bed dryer for rapidly drying large-particle materials |
| CN115046728A (en) * | 2022-05-12 | 2022-09-13 | 台州学院 | Device and method for measuring bubble coalescence and breakage events of straight pipe air flow distributor of gas-liquid biological bubbling fluidized bed |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |