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CN-121988238-A - Diversion component, fluidized bed reactor and reaction method

CN121988238ACN 121988238 ACN121988238 ACN 121988238ACN-121988238-A

Abstract

The invention relates to a flow guiding member, a fluidized bed reactor and a reaction method. The flow guiding member comprises an elongated member having a proximal end and a distal end and an elongated body extending between the proximal end and the distal end, wherein the elongated body comprises at least a section in which, when the elongated body is cut at any position along the flow guiding direction, only a pair of most distant points, called a first point and a second point, respectively, can be found on the outer periphery of the obtained cross section, the outer periphery of the total cross section being separated by the first point and the second point into a first line and a second line connected end to end, the straight line connecting the first point and the second point being called a dividing line, the length of the first line being L1, the length of the second line being L2, the L1/L2 value being greater than 1. The invention can form stronger vortex at the guide member, thereby more effectively promoting the contact and mixing of gas and solid and further improving the fluidization quality of gas and 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 flow directing member comprising an elongate member having a proximal end and a distal end and an elongate body extending between the proximal end and the distal end, wherein the elongate body comprises at least a section in which, when the elongate body is cut at any position along a direction of flow, only a pair of furthest apart points, respectively referred to as a first point and a second point, can be found on the outer periphery of the obtained cross-section (referred to as the total cross-section), the outer periphery of the total cross-section being separated by the first point and the second point into a first line and a second line connected end to end, the straight line connecting the first point and the second point being referred to as a dividing line, the length of the first line being L1 and the length of the second line being L2, the L1/L2 value being greater than 1 (preferably 1.01-1.5 or 1.03-1.2).
  2. 2. The flow directing member of claim 1, meeting at least one (preferably all) of the following conditions: 1) The first line is a curve (preferably a smooth curve, more preferably a smooth curve consisting of a plurality of circular arcs/elliptical arcs), the second line is a curve (preferably a smooth curve, more preferably a smooth curve consisting of a plurality of circular arcs/elliptical arcs) or a straight line, 2) The whole length of the dividing line is located within the total cross-section or on the outer periphery of the total cross-section, 3) The portion of the total cross section surrounded by the dividing line and the first line is referred to as a first cross section, the portion of the total cross section surrounded by the dividing line and the second line is referred to as a second cross section, the area of the first cross section is A1, and the area of the second cross section is A2, the value of A1/A2 (provided that neither the first line nor the second line is a straight line) is greater than 1 (preferably 1.1-21 or 2-9).
  3. 3. A flow directing member as claimed in claim 2, wherein the curve is a convex curve (such as a part of a circle or ellipse (especially a minor arc), preferably a quarter or less arc or an elliptical arc) or a streamlined curve (preferably a combination of a circular arc and an elliptical arc).
  4. 4. The flow guiding member as claimed in claim 1, wherein the first and second lines are respectively composed of two circular arcs/elliptical arcs, the length ratio a 1/a2=0.05-0.6 (preferably 0.1-0.4) of the dividing line corresponding to the two circular arcs/elliptical arcs composing the first line, and the length ratio a 1/a2=0.05-0.6 (preferably 0.1-0.4) of the dividing line corresponding to the two circular arcs/elliptical arcs composing the second line.
  5. 5. The baffle member of claim 1, wherein at said proximal end said total cross-sectional area is 400-25000mm 2 and at said distal end said total cross-sectional area is 1-1500mm 2 .
  6. 6. The baffle member of claim 1, wherein at the proximal end l1=60-600 mm (preferably 100-400 mm) and at the distal end l1=3-150 mm (preferably 20-60 mm).
  7. 7. The flow directing member of claim 1, wherein the first line and the second line intersect at the first point and the second point, respectively, forming a closed pattern.
  8. 8. The flow directing member of claim 1, wherein the length of the elongate body is 50-400mm (preferably 100-300 mm) and the length of the section is 30-100% (preferably 70-100%) of the length of the elongate body.
  9. 9. The flow directing member of claim 1, wherein the obtained cross-section is referred to as a distal cross-section when the distal end of the elongate body is cut along a flow directing direction, and the obtained cross-section is referred to as a proximal cross-section when the proximal end of the elongate body is cut along a flow directing direction, the length of the dividing line of the distal cross-section being set to H1, the length of the dividing line of the proximal cross-section being set to H2, then H1/h2 = 0.005-1 (preferably 0.05-0.5).
  10. 10. The flow directing member of claim 9, wherein h1=2-100 mm (preferably 15-50 mm), h2=50-400 mm (preferably 80-300 mm).
  11. 11. The flow directing member of claim 9, wherein when the elongate body is cut at any two locations between the distal end and the proximal end along a flow directing direction, the two obtained cross sections are referred to as a first sampling cross section and a second sampling cross section, respectively, wherein the first sampling cross section is closer to the proximal end than the second sampling cross section, the length of the dividing line of the first sampling cross section is provided as Hm, the length of the dividing line of the second sampling cross section is provided as Hn, hm is ≡hn (preferably Hm > Hn).
  12. 12. The flow directing member of claim 1, wherein the length of the dividing line of the cross-section of the elongate body continuously or intermittently tapers (preferably continuously monotonically decreases) from the proximal end to the distal end.
  13. 13. The baffle member of claim 1, wherein the angle of the longitudinal direction of the elongate body to the dividing line is 30-90 degrees (preferably 60-90 degrees).
  14. 14. The flow directing member of claim 1, further comprising a columnar member, wherein the elongated member and the columnar member are connected to each other at the proximal end such that the elongated member is disposed on one or both sides of the columnar member axisymmetrically or asymmetrically about a central axis of the columnar member, or when two or more elongated members are disposed, an angle between the lengthwise directions of adjacent two elongated members is greater than 0 degrees and not greater than 180 degrees (preferably 60-180 degrees, more preferably 90-150 degrees).
  15. 15. The flow directing member of claim 1, wherein the dividing line forms an angle of 0 to 30 ° (preferably 0 to 10 °) or 0 to-30 ° (preferably 0 to-10 °) with respect to a vertical direction with respect to a central axis direction of the columnar member.
  16. 16. The flow directing member of claim 1, further comprising a sheet member, wherein the sheet member and the columnar member are connected to each other such that the sheet member is disposed on one side or both sides of the columnar member axisymmetrically or asymmetrically about a central axis of the columnar member.
  17. 17. The baffle member of claim 16, wherein two or more of the sheet members and two or more of the elongate members are alternately disposed on the columnar member, preferably adjacent two elongate members are disposed on one side or both sides of one sheet member axisymmetrically or asymmetrically with respect to the planar direction of the sheet member.
  18. 18. The baffle member of claim 16, wherein the planar direction of the sheet member forms an angle of 0-30 degrees (preferably 0-10 degrees) with the vertical direction when the central axis direction of the columnar member is taken as the vertical direction.
  19. 19. The flow directing member of claim 16, wherein the projected shape of the sheet member is at least one selected from rectangular, triangular, trapezoidal, semi-elliptical and profiled shapes, preferably semi-elliptical.
  20. 20. The baffle member of claim 16, wherein the ratio of the projected area of the sheet member to the elongated member is between 0.05 and 0.6.

Description

Diversion component, fluidized bed reactor and reaction method Technical Field The invention relates to the technical field of solid fluidization. More particularly, the present invention relates to a flow guiding member, a fluidized bed reactor and a reaction method. Background Fluidized bed reactors refer to devices in which a gas undergoes a chemical reaction in a bubbling bed of solid material or catalyst, also known as "bubbling bed reactors". 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 some properties of the liquid, 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 WO2020078414A1 discloses a fluidized bed reactor employing double trapezoidal members. The double-trapezoid member consists of two groups of baffle groups with holes, wherein the side sections of the baffle groups are trapezoidal, the long sides of each baffle group are parallel to each other and have different distances so as to form a specific included angle on the side surface, the trapezoid areas of the side surfaces surrounded by the baffle groups of each two groups are mutually inverted and overlapped to form a double-trapezoid member unit, and the member units are arranged in multiple rows and multiple layers to form a foam breaking flow guiding member whole in a dense-phase area of the fluidized bed reactor. Through the multilayer double-trapezoid baffle and the on-board diversion hole structure of specific angle design, the effective crushing of large bubbles in the dense bed is realized, meanwhile, particles are prevented from being accumulated and blocked on the baffle, and the fluidization quality and the reaction efficiency of the particles in the bed are improved. 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 design of the internal member with the whole grid type is still the traditional bubble breaking configuration, the local vortex effect is not obvious, 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 gas and solid and the heat and mass transfer efficiency of gas and solid are difficult to ensure. The invention aims to provide a flow guiding component which can form stronger vortex in a reactor, so that contact and mixing of gas and solid are more effectively promoted, and the gas and solid fluidization quality is further improved. According to a first aspect of the invention, a flow guiding member is provided, comprising an elongated member having a proximal end and a distal end, and an elongated body extending between the proximal end and the distal end, wherein the elongated body comprises at least a section in which, when the elongated body is cut at any position along a flow guiding direction, only a pair of most distant points, called first and second points, respectively, can be found on the outer periphery of the obtained cross section (called total cross section), the outer periphery of the total cross section being divided by the first and second points into a first and a second line connected end to