Fluidized bed reactor

A technology of fluidized bed reactor and straight cylinder, which is applied in the field of reactors and can solve the problems of weak market competitiveness and few brands

Active Publication Date: 2014-03-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ethylene propylene rubber produced by this technology contains more than 20% carbon black, so the product can only be used in carbon black filled products, with fewer brands and weak market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, the fluidized bed of the present invention is followed by a gas-gathering section 4, a straight cylinder section 10 and an enlarged section 11 from bottom to top, a gas distribution plate 5 is installed between the gas-gathering section 4 and the straight cylinder section 10, and a gas distribution plate 5 is arranged at the bottom of the gas-gathering section 4. There is a circulating gas inlet 3.

[0035] The power mechanism composed of motor 1 and reducer 2 is installed outside the fluidized bed. The output end of the reducer 2 is connected to the rotating shaft 8 to drive the rotating shaft 8 to rotate. The rotating shaft 8 is inserted from the center of the bottom of the fluidized bed and passes through the gas collecting section 4 And the gas distribution plate 5 extends into the straight cylinder section 10, and the rotating shaft 8 is provided with a shaft sleeve 9, the shaft sleeve 9 is slidably positioned and installed on the rotating s...

Embodiment 2

[0043] like image 3 and 4 As shown, the difference between this embodiment and Embodiment 1 is only the shape of the stirring paddle and the baffle. Taking one side of the rotating shaft as an example, the stirring paddle 6 in this embodiment includes two horizontal support rods 15, two A plurality of paddles 16 are radially arranged on the support rods, and the paddles on the two support rods extend axially toward each other.

[0044] As far as a single paddle is concerned, it is thin-plate-shaped, and the plate surface is approximately vertical and consistent with the radial direction of the rotating shaft. is 45°, and the other acute angle points to the axis of rotation.

[0045] The baffle plate cooperating with the stirring paddle is located in the middle of the two support rods. As shown in the figure, the baffle plate includes a radially extending support portion 17, and several baffle plates 18 are arranged on the top and bottom of the support portion 17, each The ...

Embodiment 3

[0049] like Figure 5 and 6 As shown, the difference between this embodiment and Embodiment 1 lies in the shape of the stirring paddle and the baffle plate. Part 21, the third transverse part 22, and the vertical part 23 connecting the three, wherein the first transverse part 20 in the middle is connected with the shaft sleeve, and the vertical part 23 is close to the inner wall 13 of the straight tube section.

[0050] The first transverse portion 20, the second transverse portion 21, and the longitudinal section of the third transverse portion 22 are all right-angled triangles. Taking the first transverse portion 20 as an example, an acute angle thereof is used as the shearing edge 14, and the cutting edge angle is 60°. The shearing edge 14 points to the rotation direction of the stirring paddle, and the same is true for the shearing edges on the second transverse portion 21 and the third transverse portion 22 .

[0051] The baffle plate 7 cooperating with the stirring pad...

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Abstract

A disclosed fluidized bed reactor comprises a gas collection segment, a straight-tube segment and an enlargement segment, the gas collection segment and the straight-tube segment are separated by a gas distribution plate; the straight-tube segment is inside provided with a rotating shaft and stirring blades; the straight-tube segment is also inside provided with a baffle plate; and the baffle plate is cooperated with the stirring blades for shearing materials. The fluidized bed reactor is provided with the stirring system and does not need auxiliary inert particles, so that high-viscosity polymer particles are prevented from agglomeration and attaching to the inner wall of the reactor; and the fluidized bed reactor provided by the invention is capable of generating effective stirring mixing effect and improving the fluidization stability of the high-viscosity polymer particles.

Description

technical field [0001] The invention relates to a reactor, in particular to a fluidized bed reactor. Background technique [0002] The gas-phase polymerization of olefins is usually carried out in a fluidized bed, and the polymer particles are fluidized in a circulating gas composed of polymerized monomers / polymerized comonomers, molecular weight modifiers (hydrogen) or inert gases to perform gas-solid phase reactions. For general-purpose polypropylene and polyethylene particles, a stable fluidized reaction can be achieved in an ordinary fluidized bed without internals. However, as the volume of the reactor increases, it is difficult to maintain uniform fluidization and gas-solid contact in the fluidized bed, which will cause poor local heat transfer, causing local overheating and higher than the softening point of the polymer particles, that is, "hot spots". In addition, for copolymerized polypropylene particles with high ethylene content, the surface of the particles is p...

Claims

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Application Information

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IPC IPC(8): B01J8/24B01F7/16
Inventor 王嘉骏张永俊冯连芳顾雪萍
Owner ZHEJIANG UNIV
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