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Method for reducing electrostatic level in fluidized bed reactor

A fluidized bed reactor and fluidized bed technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problem of ineffective neutralization of charges, infrequent use of static elimination devices, and adverse effects of molecular weight/molecular weight distribution, etc. problem, to achieve the effect of easy realization and simple method

Inactive Publication Date: 2010-03-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the antistatic agent should not adversely affect the activity of the catalyst or the molecular weight / molecular weight distribution of the product;
[0011] g. Install a static eliminator, because it cannot effectively neutralize the charge, and because it is unsafe to install a static eliminator, it is not commonly used in industrial reactors

Method used

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  • Method for reducing electrostatic level in fluidized bed reactor
  • Method for reducing electrostatic level in fluidized bed reactor
  • Method for reducing electrostatic level in fluidized bed reactor

Examples

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Effect test

Embodiment 1

[0038] In a gas-solid fluidized bed with a height of 1000mm and an inner diameter of 150mm made of plexiglass, the distribution plate is a porous flat plate with a diameter of 150mm, the aperture is 2.0mm, and the opening ratio is 2.6%, and the distribution plate is composed of a diameter of 100mm. The ring composition (such as image 3 As shown, the holes in the distribution plate are not marked), which can control the superficial gas velocity in two zones. Air is used as the fluidizing gas, and the superficial gas velocity is 0.5m / s. The fluidizing medium is sieved and mixed LLDPE particles. After sieving, LLDPE becomes five kinds of particles with different average particle sizes of P1, P2, P3, P4, and P5. : Mix in a ratio of 10:10. The static bed height is 300mm, the sampling frequency is 100Hz, and each sampling time is 300s. Change the height of the electrostatic detector to 27mm, 107mm, 187mm, 267mm, 346mm, 426mm, 504mm, and 529mm above the distribution plate, and m...

Embodiment 2

[0043]In a gas-solid fluidized bed made of plexiglass with a height of 1000mm and an inner diameter of 150mm, the distribution plate is a porous flat plate with a diameter of 150mm and a hole diameter of 2.0mm. The opening rate is 2.6%. The distribution plate is composed of an inner circle with a diameter of 100mm and an outer ring. , which can control the superficial gas velocity in two regions. Air is used as the fluidizing gas, and the superficial gas velocity is 0.5m / s. The fluidizing medium is sieved and mixed LLDPE particles. After sieving, LLDPE becomes five kinds of particles with different average particle sizes of P1, P2, P3, P4, and P5. : Mixed in a ratio of 20:50. The static bed height is 300mm, the sampling frequency is 100Hz, and each sampling time is 300s. Change the height of the electrostatic detector to 27mm, 107mm, 187mm, 267mm, 346mm, 426mm, 504mm, and 529mm above the distribution plate, and measure the electrostatic potential distribution in the fluidiz...

Embodiment 3

[0046] In high 12000mm, internal diameter 3050mm, distribution plate is perforated plate (diameter of inner circle is 2000mm), and aperture is in the industrial pilot test fluidized bed device of 2.5% (gas-phase process technology production polyethylene) with 16mm aperture ratio, reaction temperature is 87°C, the electrostatic detector is placed 2100mm above the distribution plate and 5mm away from the wall. The superficial gas velocity is 0.7m / s, the sampling frequency is 100Hz, and each sampling time is 100s. Calculate the collected electrostatic signal to find the steady-state electrostatic potential U s .

[0047] Under abnormal working conditions, the negative electrostatic potential is greater than 2800V, that is, the positive potential level in the fluidized bed is relatively high, so increasing the distribution plate is conducive to the increase of the negative electrostatic potential level, that is, the gas velocity in the outer ring area to 0.75m / s, and the reducti...

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Abstract

The invention discloses a method for reducing electrostatic level in a fluidized bed reactor. The method comprises the following steps: receiving an electrostatic signal inside the fluidized bed reactor, analyzing the received electrostatic signal, selecting characteristic parameters of the electrostatic signal and determining the electrostatic potential level in a fluidized bed, adjusting the superficial gas velocity of different areas, and achieving the reduction of the electrostatic level in the fluidized bed reactor. The method can effectively reduce the electrostatic level in the fluidized bed reactor, so as to ensure continuously stable production operation, has the characteristics of environmental protection, safety, simpleness and easiness and fastness and the like, can reduce thestatic electricity in the fluidized bed reactor to a great extent and control the production parameters according to detection results.

Description

technical field [0001] The invention relates to static monitoring of a fluidized bed reactor, in particular to a method for reducing the static level in a fluidized bed reactor. Background technique [0002] The problem of static electricity is a prominent technical problem that has plagued the production process of gas-phase polyethylene fluidized bed for a long time. The existence of static electricity will not only affect the hydrodynamic behavior in the fluidized bed, but also cause problems such as sheeting, blockage of the distribution plate, and even shutdown, which seriously affect the continuity of the device. [0003] At present, the essence of controlling static electricity is to reduce the accumulation of static electricity, which can be achieved mainly through the following methods: surface treatment of the wall, changing operating conditions, adding fine particles, installing grounding devices, increasing gas humidity, adding antistatic agents, installing stati...

Claims

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Application Information

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IPC IPC(8): B01J8/24C08F2/34C08F10/02
Inventor 王靖岱徐怡许南黄正梁蒋斌波阳永荣
Owner ZHEJIANG UNIV
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