Horizontal type agitated bed reactor material volume detection method

The technology of a horizontal agitated bed and a detection method is applied to the detection of the material holding capacity of the horizontal agitated bed reactor and the detection of the material level of the solid particles in the polymerization kettle, and can solve the change of reading, false report of material level, no material level, etc. problems, to achieve the effect of low measurement conditions, easy and convenient installation, and small measurement errors

Active Publication Date: 2008-08-13
SINOPEC YANGZI PETROCHEM
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Problems solved by technology

At present, the material level detector equipped on the industrial horizontal stirred bed reactor is a radiation material level detector using radioactive rays, and its reading is in the form of a percentage, and there is no specific definite value of the material level; when the pressure in the tank increases, the reading will change , at the same time, when the bulk density of the particles in the kettle

Method used

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  • Horizontal type agitated bed reactor material volume detection method
  • Horizontal type agitated bed reactor material volume detection method
  • Horizontal type agitated bed reactor material volume detection method

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Embodiment 1

[0042] use as figure 1 In the cold mold device shown, the horizontal reactor has a length of 1530mm and an inner diameter of 475mm, and is made of transparent plexiglass. The stirring paddle is blade-type, made of stainless steel, and the rotation speed is 15rpm. The acoustic emission signal is measured with an acoustic wave measuring instrument. The sound wave measuring instrument includes a sound wave receiving device, an amplifying device, a signal collecting device and a signal processing device, the sampling frequency is 500kHz, and the sampling time is 10s. The powder used in the experiment is impact polypropylene (a certain industrial device powder), and its melt index and density are 2.0g / 10min and 900kg / m3 respectively 3 , the average particle size is 312mm, and the particle size distribution is shown in Table 1.

[0043] Table 1. Particle Size Distribution of Impact Polypropylene

[0044]

[0045] Select the outer wall of the middle part of the horizontal react...

Embodiment 2

[0047] The detection of the material level in an industrial horizontal stirring polymerization reactor was carried out by using the acoustic wave measurement technology. The device is composed of two horizontal reactors connected in series, using BP-Amoco's patented product - Amoco CD catalyst, polymerized in a gas-phase horizontal tank close to plug flow, and can produce homopolymers (HP) and random copolymers (RCP), impact copolymer (ICP) and other products. The horizontal reactor is 13700mm in length, 2743mm in inner diameter, made of stainless steel, and the speed is maintained at 15r / min. Acoustic emission signals are measured by acoustic wave measuring instruments, which include acoustic wave receiving devices, amplification devices, signal acquisition devices and signal processing devices, with a sampling frequency of 1MHz and a sampling time of 5s. Remove a circle of insulation layer on the reactor insulation layer in advance, so that the acoustic emission sensor is d...

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Abstract

The invention discloses a horizontal stirred-bed reactor material level detection method. The method receives acoustic emission signal from the horizontal stirred-bed reactor; a acoustic signal receiving device receives outside wall vertical profile of the reactor line acoustic emission signal device on inspection time, and receives the acoustic emission signal in the stirred-bed reactor; analyzing the received acoustic signal, selecting the average energy E, amplitude A and mean-square deviation S as a character variables; the reactor material level is judged through the changes of the adjacent position acoustic signal amplitude mean-square deviation on the surface of the same circumference section outside wall of the reactor and the mean-square deviation ratio; the appropriate location is material level when the acoustic signal amplitude mean-square deviation and the mean-square deviation ratio both reach the maximum. The acoustic emission receiving device of the invention is non-plug-in, and easy and convenient to install, safe environment, rapid response, small measurement error, and has a wide applicability.

Description

technical field [0001] The invention relates to the detection of the material level of a reactor, in particular to a method for detecting the material holding capacity (material level) of a horizontal stirred bed reactor, especially a method for detecting the material level of solid pellets in polymerization kettles such as polyethylene and polypropylene. Background technique [0002] The material level refers to the relative height of the material in the reactor. As one of the parameters reflecting the flow state, it is very important for the control of the reactor load, the prevention of the formation of fibrous and lumpy materials, and the stable operation of the entire system. influences. If the material level is too low or too high, it will cause abnormalities in the reactor, such as agglomeration. Taking a horizontal stirred bed reactor as an example, too low a material level will cause: A) the average residence time of the catalyst is reduced, and the yield is reduce...

Claims

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Application Information

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IPC IPC(8): G01F23/296B01J19/18
Inventor 钱建忠阳永荣殷大斌王靖岱周健曹翌佳徐健黄正梁王纯刘伟
Owner SINOPEC YANGZI PETROCHEM
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