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A Gas-Solid Distributor for Reducing Backmixing at the Riser Outlet of a Combined Fluidized Bed in Series

A technology of series combination and riser, which is applied in the direction of chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reducing the riser, and achieve the effects of reducing back-mixing, easy transformation, and low cost

Inactive Publication Date: 2014-10-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no relevant reports in literature and patents on the equipment and method of reducing the restricted backmixing at the outlet of the riser with a series combined fluidized bed

Method used

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  • A Gas-Solid Distributor for Reducing Backmixing at the Riser Outlet of a Combined Fluidized Bed in Series
  • A Gas-Solid Distributor for Reducing Backmixing at the Riser Outlet of a Combined Fluidized Bed in Series
  • A Gas-Solid Distributor for Reducing Backmixing at the Riser Outlet of a Combined Fluidized Bed in Series

Examples

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Embodiment 1

[0028] See attached figure 1 And attached figure 2 , a gas-solid distributor for reducing backmixing at the riser outlet of a series combined fluidized bed in this embodiment, comprising: a hollow inverted cone 1 , a cone 2 , and a distribution plate 3 . The cone edge 2 is closely connected to the inner surface of the hollow inverted cone 1, the distribution plate 3 is provided with gas and particle outflow holes, the distribution plate 3 is closed and connected with the upper end surface of the hollow inverted cone 1, and the hollow inverted cone 1 The end surface is closed and connected with the outlet of the riser, and the hollow inverted cone 1 connected with the distribution plate 3 extends into the bed.

[0029] The hollow inverted conical frustum 1 is a conical frustum, the upper end surface and the lower end surface are open openings, the equivalent diameter Dr of the lower end surface is equal to the equivalent diameter of the riser connected to it, the height H=(0....

Embodiment 2

[0035] See attached figure 1 And attached figure 2 , a gas-solid distributor for reducing backmixing at the riser outlet of a series combined fluidized bed in this embodiment, comprising: a hollow inverted cone 1 , a cone 2 , and a distribution plate 3 . The connection mode of the hollow inverted cone 1, the cone 2, and the distribution plate 3 is the same as that of embodiment 1, the structure of the hollow inverted cone 1 and the cone 2 is the same as that of embodiment 1, and the structure of the distribution plate 3 is the same as that of embodiment 1 different.

[0036] See attached Figure 4 , the distribution plate 3 is a concave arc panel, and the inner arc surface height H1=(0.2~0.4)Dr of the concave arc panel; the opening ratio K1 based on the section of the riser in the area of ​​the horizontal projection diameter De<0.5Dd of the distribution plate 3 = 20% to 30%, in the area of ​​distribution plate 3 horizontal projected diameter De=0.5Dd~Dd, the opening rate K...

Embodiment 3

[0040] See attached figure 1 And attached Figure 5 , a gas-solid distributor for reducing backmixing at the riser outlet of a series combined fluidized bed in this embodiment, comprising: a hollow inverted cone 1 , a cone 1 , and a distribution plate 3 . The cone edge 2 is closely connected to the inner surface of the hollow inverted cone 1, the distribution plate 3 is provided with gas and particle outflow holes, the distribution plate 3 is closed and connected with the upper end surface of the hollow inverted cone 1, and the hollow inverted cone 1 The end surface is closed and connected with the outlet of the riser, and the hollow inverted cone 1 connected with the distribution plate 3 extends into the bed.

[0041] The hollow inverted conical frustum 1 is a conical frustum, the upper end surface and the lower end surface are open openings, the equivalent diameter Dr of the lower end surface is equal to the equivalent diameter of the riser connected to it, the height H=(0....

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Abstract

The invention provides a gas-solid distributor capable of reducing back-mixing at an outlet of a riser of a series combination fluidized bed. The gas-solid distributor at least comprises a hollow inverted frustum, one to five rows of conical ridges and a distributor plate. The section of each conical ridge is triangular, the conical ridges are closely connected to the inner surface of the hollow inverted frustum and are arranged from top to bottom, the distributor plate is hermetically connected with the upper end surface of the hollow inverted frustum, the sum of the aperture ratio K1 of the distributor plate within a distributor plate horizontal projection region with the diameter De smaller than (0.5-0.8) times Dd and the aperture ratio K2 of the distributor plate within a distributor plate horizontal projection region the diameter De ranging from (0.5-0.8) times Dd to the Dd ranges from 20% to 80%, wherein the aperture ratios K1 and K2 are based on the section of the riser, K2 / K1 ranges from 1.1 to 3.5, and the Dd is the diameter of horizontal projection of the distributor plate. The gas-solid distributor can remarkably reduce back-mixing of an outlet region of the riser of the series combination fluidized bed, further can improve distribution uniformity of gas and solid in an upper bed, is simple in structure and is widely applicable to petroleum refining and petrochemical engineering, coal chemical industry, particle burning, pharmaceutical or environmental protection fields, and modification to an original device is easy to implement.

Description

technical field [0001] The invention relates to a series combined fluidized bed whose lower structure is a riser and whose upper structure is a bed (bubbling bed, or turbulent bed, or fast bed), in particular to a method for reducing backflow at the outlet of a series combined fluidized bed riser. A mixed gas-solid distributor belongs to the fields of petroleum refining and chemical industry, coal chemical industry, particle combustion, pharmacy or environmental protection. Background technique [0002] The lower riser and the upper bed (bubbling bed, or turbulent bed, or fast bed) are combined in series in a fluidized bed. The gas-solid mixture has a shorter residence time in the lower riser and a relatively longer residence time in the upper bed. The residence time, the gas-solid mixture after the reaction in the riser can enter the upper bed through the gas-solid distributor installed at the outlet of the riser to continue the subsequent reaction. This series combination ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24
Inventor 王德武张少峰卢春喜贾梦达赵立军吴广恒
Owner HEBEI UNIV OF TECH
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