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CN-121988236-A - Combined fin component and application thereof

CN121988236ACN 121988236 ACN121988236 ACN 121988236ACN-121988236-A

Abstract

The invention relates to a composite fin member and use thereof. The combined fin member of the present invention comprises a center pillar, at least two first fins arranged around the center pillar, and at least two second fins arranged around the center pillar, wherein the spanwise length of the first fins is more than 2 times the spanwise length of the second fins, and the maximum height of the first fins is less than 1 time the maximum height of the second fins. The invention can more effectively promote the contact and mixing of the gas and the solid, thereby improving the fluidization quality of the gas and the solid.

Inventors

  • QI GUOZHEN
  • XU JUN
  • YE JUNXIANG
  • LI YONGZHENG
  • LIU ZIYAN

Assignees

  • 中国石油化工股份有限公司
  • 中石化（上海）石油化工研究院有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (20)

  1. 1. A composite fin member comprising a central column, at least two (preferably 2-4) first fins disposed about the central column, and at least two (preferably 2-4) second fins disposed about the central column, wherein the spanwise length of the first fins is more than 2 times (preferably 3-5 times) the spanwise length of the second fins, and the maximum height of the first fins is less than 1 times (preferably 0.5-0.95 times) the maximum height of the second fins.
  2. 2. The combination fin member of claim 1, wherein the first fins are the same number as the second fins and are alternately disposed around the center post, respectively.
  3. 3. The combination fin member of claim 1, wherein said at least two first fins are evenly spaced around said central post and said at least two second fins are evenly spaced around said central post.
  4. 4. The combination fin member of claim 1, wherein an angle between a length direction of one of said first fins and a length direction of an adjacent other of said first fins is greater than 0 degrees and not greater than 180 degrees (preferably 60-180 degrees, more preferably 90-150 degrees).
  5. 5. The combination fin member of claim 1, wherein an angle between a length direction of one of said second fins and a length direction of an adjacent other of said second fins is greater than 0 degrees and not greater than 180 degrees (preferably 60-180 degrees, more preferably about 100.4 degrees).
  6. 6. The combination fin member of claim 1, wherein an angle between a lengthwise horizontal projection of one of said first fins and a lengthwise horizontal projection of an adjacent one of said second fins is greater than 0 degrees and no greater than 90 degrees (preferably 10-90 degrees, more preferably about 67.5 degrees).
  7. 7. The combination fin member of claim 1, wherein an angle of a length direction of said first fin to a central axis of said central column is 30-90 degrees (preferably 60-90 degrees).
  8. 8. The combination fin member of claim 1, wherein a projection of a length direction of said second fin on a horizontal plane forms an angle of 80-90 degrees (preferably about 90 degrees) with a central axis of said center post.
  9. 9. The combination fin member of claim 1, wherein an angle of a height direction of said first fin to a central axis of said center post is 0 to 30 degrees (preferably 0 to 10 degrees).
  10. 10. The combination fin member of claim 1, wherein the height direction of said second fin is at an angle of 0-10 degrees (preferably about 0 degrees) to the central axis of said central column.
  11. 11. The combination fin member of claim 1, wherein the cross-sectional shape of said first fin is at least one selected from the group consisting of rectangular, triangular, trapezoidal, circular, oval and a special-shaped shape, preferably oval.
  12. 12. The combination fin member of claim 1, wherein the projected shape of said second fin is at least one selected from the group consisting of rectangular, triangular, trapezoidal, semicircular, semi-elliptical and profiled, preferably semi-elliptical.
  13. 13. The combination fin member of claim 1, wherein said first fin has a proximal end and a distal end, and an elongated body extending between said proximal end and said distal end, said first fin and said center post being connected to each other at said proximal end, a first cross-section and a second cross-section being obtained when said elongated body is cut at any two positions along a height direction of said first fin, respectively, wherein said first cross-section is closer to said proximal end than said second cross-section, an area of said first cross-section being provided as A1 (in mm 2 ), an area of said second cross-section being provided as A2 (in mm 2 ), a1≥a2 (preferably A1> A2).
  14. 14. The combination fin member of claim 1, wherein said first fin has a proximal end and a distal end, and An elongated body extending between said proximal and distal ends, with a cross-sectional area of said proximal end being An (in mm 2 ) and a cross-sectional area of said distal end being Af (in mm 2 ), an/Af = 1-25000 (preferably 1.2-15).
  15. 15. The combination fin member of claim 14, wherein An = 400-25000mm 2 ,Af＝1-1500mm 2 .
  16. 16. The combination fin member of claim 14, wherein the height Ha1 of the distal end is 2-100mm and the height Ha2 of the proximal end is 50-400mm.
  17. 17. The combination fin member of claim 1, wherein the first fin has a spanwise length Ca of 50-400mm and a thickness of 1.5-30mm.
  18. 18. The combination fin member of claim 1, wherein said second fin has a proximal end and a distal end, and an elongated body extending between said proximal end and said distal end, said second fin and said center post being connected to each other at said proximal end, a first cross-section and a second cross-section being obtained when said elongated body is cut at any two positions along a height direction of said second fin, respectively, wherein said first cross-section is closer to said proximal end than said second cross-section, an area of said first cross-section being provided as B1 (in mm 2 ), an area of said second cross-section being provided as B2 (in mm 2 ), B1 ≡b2 (preferably B1> B2).
  19. 19. The combination fin member of claim 1, wherein said second fin has a proximal end and a distal end, and an elongated body extending between said proximal and distal ends, with the area of the cross section of said proximal end being Bn (in mm 2 ) and the area of the cross section of said distal end being Bf (in mm 2 ), then Bn/Bf = 1-105 (preferably 3.5-10).
  20. 20. The combination fin member of claim 19, wherein Bn = 100-800mm 2 ,Bf＝10-400mm 2 .

Description

Combined fin component and application thereof Technical Field The invention relates to the technical field of solid fluidization. More particularly, the present invention relates to a combination fin structure and its use in a fluidized bed reaction. Background Fluidized bed reactors refer to devices in which a gas undergoes a chemical reaction in a fluidized bed of solid material or catalyst. The gas will, over a range of flow rates, vigorously agitate the solid particles of catalyst or material packed to a certain thickness (bed) to resemble a boiling liquid and have fluid properties such as fluid pressure against the walls, overflow and viscosity. Compared with a fixed bed reactor, the fluidized bed reactor can realize continuous input and output of solid materials, has good heat transfer performance due to movement of fluid and particles, has uniform temperature inside the bed layer, is easy to control, is particularly suitable for strong exothermic reaction, is convenient for continuous regeneration and circulation operation of the catalyst, and is suitable for the process with high catalyst deactivation rate. Fluidized bed is a typical reactor device commonly used in industrial gas-solid two-phase reaction process, but because of the fluidization characteristic of part of particles, gas-solid two-phase generates bubbles, so that the residence time of the particles in the reactor is unevenly distributed, the bed layer frequently fluctuates, and the yield of target products is greatly reduced. To improve the process, a method of adding a bubble breaking member to the inside of the reactor is generally employed. The bubble breaking inner member of the fluidized bed reactor in the prior art mainly comprises three types of horizontal members, vertical members and composite members. The gas passes through the horizontal member to divide the large bubbles into strip-shaped bubbles, but a certain distance after bubble breaking forms coalescence, the vertical member has the effect of limiting the growth of bubbles and has very limited effect on bubble breaking, and the composite member has limited application in the fluidized bed reactor due to the excessively complex structure. Patent CN105460938a discloses a polygonal vertical fluidized bed bubble breaker member. The component is arranged on the upper layer of the reaction zone of the fluidized bed reactor, the horizontal section of the fluidized bed reactor is covered by a plurality of vertical baffles, and the whole baffle is positioned in the windward direction of the airflow in the fluidized bed reactor. When the fluidized bed reactor is internally provided with a throttling lifting reaction bed layer, the baffle plate structure can cut and crush large bubbles in the bed layer, so that the effect of eliminating the throttling and optimizing the fluidization of particles is achieved. Disclosure of Invention The inventor of the present invention found that, although the known scheme of the prior art considers the breaking and aggregation prevention of bubbles in the reaction process, the whole design of the inner member, which is a baffle plate or a grid, relies on the mechanical collision of the member and the bubbles to realize the breaking of bubbles, the local vortex principle is not applied to strengthen the particle flow to inhibit the generation of bubbles, the radial transfer of gas and solid is difficult to realize, strong vortex and turbulent flow are difficult to form under the condition of a certain process requirement of rising gas velocity, and the fluidization quality of the gas and solid and the heat and mass transfer efficiency of the gas and solid are difficult to ensure. In particular, the present invention relates to the following aspects. 1. A composite fin member comprising a central column, at least two (preferably 2-4) first fins disposed about the central column, and at least two (preferably 2-4) second fins disposed about the central column, wherein the spanwise length of the first fins is more than 2 times (preferably 3-5 times) the spanwise length of the second fins, and the maximum height of the first fins is less than 1 times (preferably 0.5-0.95 times) the maximum height of the second fins. 2. The combination fin member of any one of the preceding or subsequent aspects, wherein the first fins and the second fins are the same in number and are alternately arranged around the center pillar, respectively. 3. The combination fin member of any one of the preceding or subsequent aspects, wherein the at least two first fins are disposed at uniform intervals around the central column, and the at least two second fins are disposed at uniform intervals around the central column. 4. The combination fin member of any one of the foregoing or the following aspects, wherein an angle between a longitudinal direction of one of the first fins and a longitudinal direction of an adjacent other of the first fins is greater than 0 degrees and not