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Sampler and method for measuring multi-phase-flow phase holdup distribution

A sampler and multiphase flow technology, applied in sampling devices and other directions, can solve the problems of unpredictable flow direction of sampling points, complicated flow of multiphase reactors, affecting the accuracy of sampling results, etc. The effect of accuracy

Active Publication Date: 2016-03-02
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The so-called "tangential sampling method" widely used at present is only suitable for relatively simple flows that can predict the approximate flow direction in advance, while the flow in multiphase reactors is often complicated, and the flow direction of the sampling point cannot be predicted, so the sampling results will be seriously affected the accuracy of

Method used

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  • Sampler and method for measuring multi-phase-flow phase holdup distribution
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  • Sampler and method for measuring multi-phase-flow phase holdup distribution

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A sampler for measuring holdup distributions of multiphase fluid phases, such as figure 1 shown. The sampler comprises a front-end sampling tube 1, a freely turning connecting tube, a rear-end sampling tube 5 and a regulator for adjusting the direction of the front-end sampling tube 1 nozzle, and the front-end sampling tube 1 is connected to the rear-end sampling tube through the connecting tube. tube 5 is connected, the regulator includes an adjustment rod 6 and an adjustment piece 2 installed on one end of the adjustment rod 6, the other end of the adjustment rod 6 is connected with the front sampling tube 1, and the number of the adjustment pieces 2 is four , the spacing between the regulating pieces 2 is the same, the shape of the regulating pieces 2 is trapezoidal, and the sides of the trapezoid facing the incoming flow are two parallel sides.

[0049] The front end sampling tube 1 of the sampler is a plexiglass tube material, its inner diameter is 6mm, the wall t...

Embodiment 2

[0052] The sampler described in Example 1 was used to measure the local solid phase holdup in the liquid-solid stirred tank reactor.

[0053] Experiment is carried out in the plexiglass stirring tank of diameter T=380mm, and experiment system is quartz sand (200 orders) and deionized water, and average solid content rate is 5wt% (mass ratio); Static liquid level height H=T, liquid The phase temperature is 22°C; the impeller is a 45° push-down six-fold open turbine impeller, the diameter of the impeller is D=T / 3, the height of the impeller from the bottom is C=T / 3, the bottom of the elliptical tank, the ratio of the major axis to the minor axis It is 2:1; Taking the lowest point of the center of the elliptical bottom of the stirred tank as the coordinate origin, the sampler described in Example 1 was adopted to measure the solid holdup at the position of (r / R, z / H)=(0.8,0.34) , wherein, r / R and z / H respectively represent the center of the bottom of the stirred tank as the origi...

Embodiment 3

[0055] The sampler described in Example 1 was used to measure the local gas phase holdup in the gas-liquid stirred tank reactor.

[0056] The experiment was carried out in a flat-bottomed plexiglass stirring tank with a diameter of T=380mm. The experimental system was air and deionized water; the height of the static liquid level was H=T, and the liquidus temperature was 22°C; the stirring paddle was a standard Rushton paddle, and the diameter of the paddle was D= T / 3, paddle height C=T / 3 from the bottom; Taking the lowest point of the center of the elliptical bottom of the stirred tank as the coordinate origin, the sampler described in Embodiment 1 was used to measure (r / R, z / H) in the gas-liquid stirred tank )=(0.8, 0.34) position gas holdup, and compared with the measurement results of the traditional sampler with the conductivity probe and the sampling nozzle placed horizontally, the results are as follows image 3 As shown, the samplers of the present invention all obtain...

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Abstract

The invention provides a sampler and method for measuring multi-phase-flow phase holdup distribution. The sampler comprises a front end sampling pipe, a connecting pipe capable of conducting free steering, a rear end sampling pipe, and an adjustor for adjusting the direction of a pipe opening of the front end sampling pipe. The front end sampling pipe is connected with the rear end sampling pipe through the connecting pipe. The adjustor comprises an adjusting rod and an adjusting piece installed at one end of the adjusting rod. The other end of the adjusting rod is connected with the front end sampling pipe. When the adjusting piece bears unbalanced force in the multi-phase-flow fluid, the adjusting piece drives the front end sampling pipe to rotate through the adjusting rod under the effect of unbalanced force till the adjusting piece bears balanced force; at the moment, the pipe opening of the front end sampling pipe just faces the multi-phase-flow incoming direction. By means of the sampler, the self-adaption can be achieved in the flowing direction of fluid at the measurement point, the flowing direction of fluid at the sampling point can be automatically sensed, the pipe opening can be automatically adjusted to just face the incoming direction, and therefore the sampling and measuring accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of physical measuring devices, and in particular relates to a sampler and a method for measuring holdup distribution of multiphase fluid phases. Background technique [0002] In industrial heterogeneous chemical reactors, there are often processes of flow, mixing, dispersion, transfer and reaction in different phases. The concentration distribution of dispersed phase particles (bubbles, liquid droplets or solid particles) is one of the most direct and effective parameters to reflect the internal characteristics of the reactor, and is an important basis for the analysis, selection and design of multiphase reactors. [0003] At present, the most commonly used methods for measuring the distribution of bubbles, liquid droplets and solid particles in multiphase flow are the optical fiber probe method based on light reflection and the conductance (capacitance) probe method based on conductance. The above methods a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/20
CPCG01N1/20
Inventor 李向阳杨超毛在砂
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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