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Component in gas-solid fluidized beds

A technology of gas-solid fluidized bed and internal components, which is applied in the field of fluidized bed, can solve the problems of complex structure and limited application, and achieve the effect of strengthening contact effect, improving flow and mass transfer, and facilitating maintenance and maintenance

Active Publication Date: 2008-05-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of internal component is also limited in its industrial application because of its complex structure.

Method used

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  • Component in gas-solid fluidized beds
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  • Component in gas-solid fluidized beds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] See Figure 1A and Figure 1B As shown, the grid form of the inner member of a specific embodiment of the present invention is given. The overall shape of the internal components of this type of grid is designed to be circular in order to adapt to the shape of the cross section in the fluidized bed (usually circular). The main components of each layer of grid include partitions 1 and guide vanes 2. The blades 2 are arranged in parallel to form a plurality of rows, and each row of blades is arranged in parallel with a certain angle to the horizontal direction, and the inclination between two adjacent rows of blades 2 is opposite. Separator 1 is arranged vertically, and height is basically the same as grid height or slightly lower than grid height (such as figure 2Shown by the dotted line in the middle), at this time, one side or both sides of the guide vane is welded to the partition 1 according to the set angle, so that the blade 2 and the partition 1 are connected an...

Embodiment 2

[0037] See figure 2 As shown, the grid form of the internal member of another specific embodiment of the present invention is given. For installation requirements (adapting to the internal cross-section of the fluidized bed), the overall shape of the grid in this embodiment is basically circular. and Figure 1A and Figure 1B The difference is that the flow area of ​​the grid in this embodiment is set as a series of concentric rings, and the separator 1 is a ring. A series of guide vanes 2 are arranged in each annular flow area (each guide vane is represented by each block area with oblique lines in the figure, wherein the thick line represents the edge above the blade, and the thin line represents the edge below the blade), the guide The flow direction is basically the same. However, the guiding direction of the guiding vanes 2 in adjacent annular flow areas is opposite. Similarly, the partition plate 1 (or baffle plate) can also be eliminated, and the adjacent guide van...

Embodiment 3

[0041] This embodiment further illustrates the implementation effect of the internal member of the present invention in combination with specific experiments.

[0042] see Figure 4 As shown, the general structure of the cold experimental device adopted in this embodiment is shown. The purpose of this experiment is to verify the improvement of the stripping effect of the novel internal member of the present invention on the stripping effect of catalytic cracking spent catalyst stripper. As shown in the figure, the device is a circulating fluidized device, the catalyst is lifted to the settler 5 in the riser 10, and after the two-stage separation of the primary inertial separator 11 and the cyclone separator 4, it enters the stripping section 6 After the stripping is completed, it enters the storage bin 7, quantitatively adds the pre-lifter 9 through the screw feeder 8, and then enters the riser 10 for the next round of circulation. The riser 10 diameter that experiment adopts...

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Abstract

The invention relates to an inner component used for a gas-solid fluidized bed, which consists of at least two layers of horizontal grates, wherein, each layer of horizontal grates comprise a plurality of mobile areas, and a series of guide vanes are ranked and arranged in the identical direction inside each mobile area, the guide vanes form an angle with the horizontal direction, and the arrangement directions of the guide vanes in the adjacent mobile areas are opposite, thereby facilitating the gas phase and solid phase to generate the cross flow, and the guide vanes inside the corresponding mobile areas of the two upper and lower adjacent horizontal grates are arranged oppositely to facilitate the gas phase and solid phase to flow along a zigzag shape. By using the inner component, not only the stability of the operation can be improved, and the mass transfer efficiency between the bubble phase inside a bed layer and an emulsion phase can be effectively improved, but also the axial back mixing of the gas phase and particulate phase inside the bed layer can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, in particular to a gas-solid fluidized bed internal component and a fluidized bed provided with the internal component. Background technique [0002] Fluidized beds are widely used in industry because of their good heat and mass transfer properties and fluid-like particle transport. The gas-solid fluidized bed is the most widely used fluidized bed, but due to the existence of air bubbles, it is easy to cause gas short circuit, which makes the gas flow seriously deviate from the plug flow, and has a significant impact on the reaction. At the same time, the existence of air bubbles also causes serious back-mixing of solid particles. When solid particles need to be removed continuously, it will cause uneven distribution of particle residence time in the reactor, resulting in a decrease in the average conversion rate at the outlet of solid particles. [0003] In order to break the bubbles...

Claims

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Application Information

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IPC IPC(8): B01J8/24
Inventor 卢春喜张永民
Owner CHINA UNIV OF PETROLEUM (BEIJING)