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Method for detecting gas-liquid dispersion state in jet flow bubbling reactor based on liquid velocity fluctuation

A technology of bubbling reactor and dispersed state, which is applied in chemical methods, chemical instruments and methods, and instruments for reacting liquid and gas medium, etc. Poor and other problems, to achieve the effect of sensitive response, low cost and convenient operation

Active Publication Date: 2019-05-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gas-liquid dispersion state has an important influence on the performance of the reactor. Poor gas-liquid dispersion will make the gas-liquid mixing effect and gas-liquid mass transfer efficiency worse, and the reaction rate will decrease.

Method used

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  • Method for detecting gas-liquid dispersion state in jet flow bubbling reactor based on liquid velocity fluctuation
  • Method for detecting gas-liquid dispersion state in jet flow bubbling reactor based on liquid velocity fluctuation
  • Method for detecting gas-liquid dispersion state in jet flow bubbling reactor based on liquid velocity fluctuation

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Experimental device such as figure 1shown. The jet bubble reactor is made of plexiglass and consists of a cylinder, a hemispherical lower head, a liquid nozzle, a gas distribution plate, and a baffle. The inner diameter of the reactor cylinder and the hemispherical head is 380mm, and the height of the reactor cylinder is 1000mm. Among them, the diameter of the gas distribution plate is 110mm, and there are 24 gas outlet holes with a diameter of 2mm uniformly distributed above it. The vertical distance between the gas distribution plate and the bottom of the reactor is 0.15m, and the vertical distance between the outlet of the liquid nozzle and the gas distribution plate is 0.4m. The liquid nozzle adopts a reduced-diameter circular nozzle, its inlet diameter and outlet diameter are 30mm and 18mm respectively, the contraction angle of the nozzle is 44°, and the diameter of the nozzle outlet is d j It is 18mm, and the ratio of the length to diameter of the cylindrical se...

Embodiment 2

[0030] The difference from Example 1 is that the axial measurement position of the Pavlov tube is at the 1 / 4 height of the lower end of the reactor cylinder. Analysis of the average value of liquid velocity V ave and liquid velocity standard deviation STD v With the change of Reynolds number of the jet flow, the critical Reynolds number Re of gas flooding and carrier gas state are respectively obtained jf1 and Re jf2 , and the critical Reynolds number Re for the carrier gas and the fully dispersed state jcd1 and Re jcd2 . Calculate the average value to get the critical Reynolds number Re of different gas-liquid dispersion states jf and Re jcd . When the nozzle outlet liquid jet Reynolds number Re j jf , it can be judged that the reactor is in a flooding state at this time; when Re jf ≤ Re j ≤ Re jcd , the reactor is in the carrier gas state; when Re j > Re jcd , the reactor is in a completely dispersed state. Compared with the visual method, the errors of the obt...

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Abstract

The invention discloses a method for detecting a gas-liquid dispersion state in a jet flow bubbling reactor based on liquid velocity fluctuation. The method comprises the following steps: measuring liquid velocity on the wall surface of the reactor; and determining the gas-liquid dispersion state in the reactor as well as critical Reynolds numbers Rejf in gas flooding and carrier gas states, and critical Reynolds numbers Rejcd in carrier gas and complete dispersion states according to change rules of time-average Vave or standard deviation STDv of a liquid velocity signal along with liquid Reynolds numbers.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for detecting the gas-liquid dispersion state of a jet bubble reactor. Background technique [0002] The jet bubble reactor is composed of a reactor cylinder, a liquid nozzle arranged on the top of the reactor cylinder, and a gas distributor arranged below the liquid nozzle. In the jet bubble reactor, the gas-liquid two-phase mixing in the reactor can be realized efficiently by using the vertical downward submerged liquid jet to shear and break the bubbles. With the increase of the flow rate at the outlet of the liquid nozzle, the gas-liquid dispersion state in the reactor experienced three flow patterns: gas flooding, carrier gas, and complete dispersion. Among them, the Reynolds number of the outlet of the liquid nozzle corresponding to the boundary point of the gas flooding state and the carrier gas state is called the Reynolds number of the liquid at ...

Claims

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Application Information

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IPC IPC(8): B01J10/00G01N13/00
Inventor 黄正梁郭晓云孙婧元杨遥帅云蒋斌波王靖岱廖祖维张浩淼阳永荣王欣妍杨勇张池金
Owner ZHEJIANG UNIV
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