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CN-224207956-U - Air distribution device for fluidized bed

CN224207956UCN 224207956 UCN224207956 UCN 224207956UCN-224207956-U

Abstract

The utility model provides an air distribution device for a fluidized bed, which comprises a hearth, a main air pipe extending in the height direction and penetrating through the bottom of the hearth and suitable for receiving external air flow, an air box arranged in the hearth and communicated with the tail end of the main air pipe, and a plurality of branch air pipes uniformly arranged on the side wall of the air box along the circumferential direction and respectively communicated with the inside of the air box, wherein a part of pipe section of each branch air pipe close to the tail end extends upwards in the height direction, and at least one air cap extending upwards in the height direction is arranged near the tail end of each branch air pipe so as to form air flow uniformly distributed in the hearth.

Inventors

  • ZHU ZHIPING
  • WANG DONGYU

Assignees

  • 中国科学院工程热物理研究所

Dates

Publication Date
20260508
Application Date
20250403

Claims (10)

  1. 1. An air distribution device for a fluidized bed, comprising: A hearth (1); The main air pipe (2) extends along the height direction and penetrates through the bottom of the hearth (1) and is suitable for receiving external air flow; A bellows (3) installed inside the furnace chamber (1) and communicated with the tail end of the main air pipe (2), and The air distribution box comprises a plurality of branch air pipes (4), wherein the branch air pipes (4) are uniformly arranged on the side wall of the air box (3) along the circumferential direction and are respectively communicated with the inside of the air box (3), a part pipe section of each branch air pipe (4) close to the tail end extends upwards along the height direction, and at least one blast cap (5) extending upwards along the height direction is arranged near the tail end of each branch air pipe (4) so as to form uniformly distributed air flow inside the air distribution box (1).
  2. 2. The air distribution device for a fluidized bed according to claim 1, characterized in that the branch air duct (4) is constructed as an L-shaped bent pipe, one end of which is connected to the side wall of the windbox (3), and the other end of which extends toward the space in the upper part of the furnace (1).
  3. 3. The air distribution device for a fluidized bed according to claim 1, characterized in that the number of the branch air ducts (4) arranged on the side wall of the wind box (3) in the circumferential direction is an even number, and a plurality of the branch air ducts (4) are symmetrically arranged with respect to a radial extension line of the cross section of the furnace (1).
  4. 4. The air distribution device for a fluidized bed according to claim 1, characterized in that a plurality of first ventilation holes (41) are uniformly arranged in the circumferential direction on the side wall of the part of each branch air pipe (4) extending toward the upper space of the furnace (1), and a hood (5) extending upward in the height direction is mounted on each first ventilation hole (41).
  5. 5. The air distribution device for the fluidized bed according to claim 4, wherein a second air vent hole (42) is further formed in the center of the top of each branch air pipe (4), and a hood (5) extending upwards in the height direction is mounted on the second air vent hole (42).
  6. 6. A wind distribution device for fluidized bed according to claim 5, wherein a plurality of third air holes (31) are uniformly arranged at the top of the wind box (3), and a wind cap (5) extending upward in the height direction is mounted on each third air hole (31).
  7. 7. The air distribution device for a fluidized bed according to claim 6, characterized in that the hood (5) mounted on the first ventilation hole (41), the second ventilation hole (42) and the third ventilation hole (31) is coplanar towards one side of the upper space of the furnace (1).
  8. 8. A wind distribution device for a fluidized bed according to claim 1, wherein the wind box (3) is configured as a cylinder having a circular cross section, so that the expansion amount of the wind box (3) in the circumferential direction is uniform during the thermal expansion.
  9. 9. The air distribution device for a fluidized bed according to claim 1, characterized in that two slag discharging pipes (7) extending downwards in the height direction are arranged at the bottom of the furnace (1), the two slag discharging pipes (7) are symmetrically arranged about the axis of the furnace (1), each slag discharging pipe (7) is located outside the wind box (3) and the branch wind pipe (4), so that the thermal expansion of the slag discharging pipe (7) is independent of the wind box (3) and the branch wind pipe (4).
  10. 10. The air distribution device for a fluidized bed according to claim 9, characterized in that the furnace (1) is internally provided with refractory material (6) to embed parts of the main air duct (2), the windbox (3), the branch air duct (4) and the slag discharge duct (7) located inside the furnace (1).

Description

Air distribution device for fluidized bed Technical Field At least one embodiment of the utility model relates to the technical field of air distribution equipment for a fluidized bed, in particular to an air distribution device for the fluidized bed. Background The fluidized bed is a widely adopted industrial device mainly used for gas-solid reaction, and has the advantages of simple structure, no moving parts, uniform gas-solid mixing and the like. The air distribution device is one of key parts of the fluidized bed, and has the function of enabling external air to uniformly pass through the bottom of the hearth and enter the inside of the hearth, so that necessary conditions are provided for fluidization of solids in the hearth. The existing air distribution device mainly adopts an air distribution plate structure and an air distribution pipe structure. The air distribution device of the air distribution plate structure comprises an air distribution plate with a hood, an air chamber below the air distribution plate, a slag discharging hole formed in the air distribution plate, a slag discharging pipe penetrating through the air chamber and the like. In order to prevent the air distribution plate from being deformed by heat, water cooling is usually required to be carried out on the air distribution plate so as to avoid expansion deformation caused by high temperature. However, the air distribution device with the air distribution plate structure is suitable for a hearth of an existing water cooling system. Under the condition that the hearth is in an adiabatic form, a water cooling device is arranged specially for the air distribution plate, and the system is complicated. And there is the thermal expansion difference between water-cooled air distribution plate and the adiabatic furnace, so that the expansion and sealing structure of the device is more complex. In order to overcome the technical defects of the air distribution device of the air distribution plate structure, the air distribution device of the air distribution pipe structure is provided in the prior art, the air pipes and the air caps are made of heat-resistant alloy steel materials, the outer wall of the main air pipe is provided with holes, a plurality of branch air pipes are led out, the branch air pipes are turned through elbows, and a plurality of air caps are arranged on the branch air pipes. However, when the section of the hearth is large, the number of the wind caps is limited by the diameter of the main wind pipe, the wind distribution device with the wind distribution pipe structure in the prior art cannot be increased in an equal proportion, the size of the wind caps is increased, the distance between the wind caps is increased, and the wind distribution uniformity is reduced. Disclosure of utility model In view of this, the present utility model provides an air distribution device for a fluidized bed to form an evenly distributed air flow inside a furnace. According to the embodiment of the utility model, an air distribution device for a fluidized bed is provided, which comprises a hearth, a main air pipe, an air box and a plurality of branch air pipes, wherein the main air pipe extends in the height direction and penetrates through the bottom of the hearth and is suitable for receiving external air flow, the air box is arranged in the hearth and is communicated with the tail end of the main air pipe, the branch air pipes are uniformly arranged on the side wall of the air box along the circumferential direction and are respectively communicated with the inside of the air box, a part pipe section of each branch air pipe close to the tail end extends upwards in the height direction, and at least one air cap extending upwards in the height direction is arranged near the tail end of each branch air pipe so as to form uniform distribution air flow in the hearth. According to an embodiment of the utility model, the branch duct is configured as a substantially L-shaped bent tube, one end of which is connected to the side wall of the bellows, and the other end of which extends toward the space in the upper part of the furnace. According to the embodiment of the utility model, the number of the branch air pipes arranged on the side wall of the air box along the circumferential direction is even, and a plurality of branch air pipes are symmetrically arranged about the radial extension line of the cross section of the hearth. According to the embodiment of the utility model, a plurality of first vent holes are uniformly arranged on the side wall of the part, extending towards the upper space of the hearth, of each branch air pipe along the circumferential direction, and a hood extending upwards along the height direction is arranged on each first vent hole. According to the embodiment of the utility model, the center of the top of each branch air pipe is also provided with a second vent hole, and a hood extending upwards along the height