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Method for detecting gas-liquid dispersion state of jet bubbling reactor

A bubble reactor and dispersion state technology, which is applied in the field of detection of gas-liquid dispersion state of jet bubble reactor, can solve the problems of gas-liquid mass transfer efficiency and reaction rate reduction, yield reduction, and destruction of flow field, etc. Achieve the effect of small measurement error, improve production efficiency and sensitive response

Active Publication Date: 2020-04-14
ZHEJIANG UNIV
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  • 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 jet bubble reactor. If the gas-liquid dispersion effect is not good, the gas-liquid mixing effect, gas-liquid mass transfer efficiency and reaction rate will be reduced, resulting in a decrease in yield.
[0003] At present, there is no public report on the detection of the gas-liquid dispersion state in the jet bubble reactor, but in the gas-liquid stirred tank, the detection methods of the gas-liquid dispersion state mainly include visual inspection, intrusive probe measurement technology, and acoustic emission detection. Technology etc.
The visual method requires the reactor to be transparent, which is not suitable for the detection of the gas-liquid dispersion state in industrial reactors, while the intrusive probe detection method will destroy the flow field, and the accuracy is not high

Method used

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  • Method for detecting gas-liquid dispersion state of jet bubbling reactor
  • Method for detecting gas-liquid dispersion state of jet bubbling reactor
  • Method for detecting gas-liquid dispersion state of jet bubbling reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0046] use as figure 1 In the acoustic emission detection device shown, the liquid (water) discharged from the bottom of the reactor 7 is measured by the flow meter 5 under the pumping action of the centrifugal pump 1, and then sprayed into the reactor 7 through the liquid nozzle 8 to form a liquid cycle. The fan 2 will Gas (air) blows into the reactor 7 from the gas distributor 6 through the flowmeter 5, and the acoustic wave sensor 9 receives the acoustic signal generated by the fluid movement in the reactor, and the acoustic wave sensor is connected to the computer 12 through the main amplifier 10 and the data acquisition card 11. An acceleration sensor is placed on the outer wall of the reactor close to the 1 / 7 static liquid level at the bottom of the reactor cylinder, the sampling frequency is 100kHz, and the sampling time is 10s. The variation law of the fluctuation distribution index of the acoustic signal with the Reynolds number of the liquid jet is as follows: figu...

Embodiment 2

[0048] The difference from Example 1 is that the sampling frequency is 50 kHz, and the acceleration sensor is placed on the outer wall of the reactor near the bottom 1 / 4 of the static liquid level of the reactor cylinder. The change law of FI with the liquid jet Reynolds number is as follows: figure 2 As shown in (b), the gas-liquid dispersion state is determined by the slope k of the curve of FI changing with the Reynolds number at the outlet of the liquid nozzle: when k=0, it corresponds to the flooding state; when k>0, it corresponds to the carrier gas state; when k< When 0, it corresponds to a completely dispersed state. Among them, when k changes from zero to a positive value, the corresponding liquid Reynolds number is the pan-point liquid Reynolds number, and the relative deviation from the measurement result of the visual method is 0; when k changes from a positive value to a negative value, the corresponding liquid Reynolds number The number is the Reynolds number o...

Embodiment 3

[0050] The difference from Example 1 is that the acoustic wave sensor is an acoustic emission sensor, and the acoustic emission sensor is placed on the outer wall of the reactor close to the bottom 1 / 2 of the static liquid level of the reactor cylinder, and the sampling frequency is 1 MHz. The change law of FI with the liquid jet Reynolds number is as follows: figure 2 As shown in (c), the gas-liquid dispersion state is determined by the slope k of the curve of FI changing with the Reynolds number at the exit of the liquid nozzle: when k=0, it corresponds to the flooding state; when k>0, it corresponds to the carrier gas state; when k< When 0, it corresponds to a completely dispersed state. Among them, when k changes from zero to a positive value, the corresponding liquid Reynolds number is the pan-point liquid Reynolds number, and the relative deviation from the measurement result of the visual method is 0; when k changes from a positive value to a negative value, the corres...

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Abstract

The invention discloses an acoustic emission detection method for a gas-liquid dispersion state in a jet bubbling reactor. The method comprises the following steps: acquiring an acoustic signal in thereactor by using an acoustic sensor arranged on the outer wall surface of a container, and determining the gas-liquid dispersion state according to the slope k of a curve with acoustic signal characteristic parameters changing with liquid Reynolds number: when k is equal to 0, the state is corresponding to a gas flooding state; when k is greater than 0, the state is corresponding to a gas carrying state; and when k is less than 0, the state is corresponding to a completely dispersed state. The method belongs to a non-invasive nondestructive measurement technology, and is high in measurement precision, safe and environment-friendly.

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] 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. Compared with the traditional stirred tank reactor, the use of liquid jets instead of stirring paddles can reduce the mechanical maintenance cost of moving equipment on the one hand, and on the other hand, effectively avoid the vibration problem of stirring paddles when the liquid circulation is large. The gas-liquid dispersion state has an important influence on the performance of the jet bubble reactor, and the poor gas-liquid dispersion effect will reduce the gas-liquid mixing effect, gas-liquid mass transfer efficiency and reaction rate, resulting in a decrease in yield....

Claims

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Application Information

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IPC IPC(8): G01N29/14
CPCG01N29/14
Inventor 黄正梁帅云杨遥孙婧元廖祖维王靖岱阳永荣蒋斌波张鹏郭晓云戴进成田思航陈思羽梁鹏任玉叶健李羽陈城
Owner ZHEJIANG UNIV
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