CN105301059B - The apparatus and method for determining gas-liquid eddy flow liquid phase residence time destribution - Google Patents
The apparatus and method for determining gas-liquid eddy flow liquid phase residence time destribution Download PDFInfo
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- CN105301059B CN105301059B CN201510712331.2A CN201510712331A CN105301059B CN 105301059 B CN105301059 B CN 105301059B CN 201510712331 A CN201510712331 A CN 201510712331A CN 105301059 B CN105301059 B CN 105301059B
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Abstract
The invention belongs to field of chemical engineering, in particular it relates to a kind of device for determining gas-liquid eddy flow liquid phase residence time destribution.Liquid phase storage tank is connected with the entrance of cyclone separator by liquid phase feeding pipeline, and liquid phase feeding pipeline is provided with liquid phase feeding pump, liquid phase flowmeter, liquid phase feeding valve；The entrance of cyclone separator connects tracer inlet simultaneously, the bottom leakage fluid dram of cyclone separator is connected by tapping line with blower fan, and tapping line is provided with rectifier cell, conductivity probe, discharge opeing knockout drum, discharge opeing branch gas phase flow rate meter, discharge opeing branch valve；Cyclone separator top vent is connected by exhaust line with blower fan, and exhaust line is provided with Exhaust branch flowmeter, Exhaust branch valve；Conductivity probe is connected with conductivity meter, conductivity meter connection computer, data record is carried out, to obtain liquid phase residence time destribution.The device can determine liquid phase residence time destribution under gas-liquid Swirl Condition, the defects of overcoming general measure mode to be not used to dispersion phase.
Description
Technical field
The invention belongs to field of chemical engineering, in particular it relates to a kind of gas-liquid eddy flow liquid phase residence time destribution that determines
Apparatus and method, for determining liquid phase residence time destribution under gas-liquid Swirl Condition, overcome conventional residence time assay method
Limitation.
Background technology
Residence time destribution is to study reactor or the important parameter of separation equipment performance, residence time destribution to reflect
Admixture of the fluid in reaction or separation equipment, it is such Optimum Design and operates essential theoretical foundation.
The measure of residence time destribution is not only widely used in Chemical Reaction Engineering and chemical separation process, and applied to design flowing
Other fields of process.
Currently used liquid phase residence time assay method has ray method, fluorescence method, photoelectric method and electrical conductivity method etc..Wherein
Radiation pollution be present and higher required to technical equipment in ray method by detecting the radioactivity determination of tracer its concentration, the method,
Seldom use；Fluorescence method is that the fluorescence intensity of fluorescent tracer is detected using fainter light detector, the method fluorescent tracer
Prepare complex, be mainly used in the measurement of polymer；Photoelectric method is to pass through staining solution by detecting specific wavelength light
Intensity, its stain concentration is determined, but the method light intensity is easily rotated by liquid film layer thickness, Gas-Liquid Dispersion state and liquid phase
The influence of flowing, the measurement of gas liquid two-phase flow state is not suitable for it.
Electrical conductivity method is the method for measure liquid phase residence time destribution the most frequently used at present.Its principle is to add in the liquid phase
Tracer (being usually electrolyte solution), determines tracer concentration, to obtain the residence time point by determining electrical conductivity in liquid phase
Cloth.But conductance measurement is Continuous Liquid Phase between must assure that two electrodes, for gas-liquid two-phase flow pattern is rotating flow, liquid throttles and spray
The state difficulty or ease accurate measurement of spray.
At present, the research on gas-liquid cyclonic unit liquid phase residence time destribution is rarely reported, the existing liquid phase residence time
Distribution determination method is only applicable to pure liquid phase measurement, and rarely has report for the residence time destribution measure of liquid phase mixed flow state
Road.During due to gas-liquid mixed flow, different degrees of difficulty is caused for above-mentioned measuring method when especially liquid phase is dispersed phase.
The content of the invention
In order to overcome the shortcomings of the prior art, the present invention provides a kind of measure gas-liquid eddy flow liquid phase residence time destribution
Apparatus and method, for determining liquid phase residence time destribution under gas-liquid Swirl Condition.
To achieve the above object, the present invention uses following proposal：
The device of gas-liquid eddy flow liquid phase residence time destribution is determined, including：Liquid phase storage tank, cyclone separator, electrical conductivity are visited
Head, blower fan；Wherein：Cyclone separator sets liquid phase mixing entrance, top vent, bottom leakage fluid dram；Liquid phase storage tank and rotation
The entrance of stream separator is connected by liquid phase feeding pipeline, by the direction of liquid phase storage tank to cyclone separator on liquid phase feeding pipeline
It is sequentially provided with liquid phase feeding pump, liquid phase flowmeter, liquid phase feeding valve；The entrance of cyclone separator connects tracer injection simultaneously
Mouthful, tracer is injected by tracer inlet；The bottom leakage fluid dram of cyclone separator is connected by tapping line with blower fan, discharge opeing
Rectifier cell, conductivity probe, discharge opeing knockout drum, discharge opeing branch gas are sequentially provided with by cyclone separator to blower fan direction on pipeline
Multi-phase flowmeter, discharge opeing branch valve；Cyclone separator top vent is connected by exhaust line with blower fan, blast pipe to blower fan side
To being sequentially provided with Exhaust branch flowmeter, Exhaust branch valve；Conductivity probe is connected by signal wire with conductivity meter, electrical conductivity
The analog signal that conductivity probe exports is converted to data signal by instrument, and is transferred to computer, data record is carried out, to obtain
Liquid phase residence time destribution.
Preferably, tracer is usually NaCl or KCl solution, and tracer is visited by changing liquid phase electrical conductivity by electrical conductivity
Head detection outlet conductivity variations, residence time destribution is obtained through data processing.
It is as follows relative to prior art, beneficial effects of the present invention：The device can determine liquid phase under gas-liquid Swirl Condition
Residence time destribution, the defects of overcoming general measure mode to be not used to dispersion phase；Meanwhile controlled using branch flow, can
The liquid phase residence time destribution under the conditions of different gas phase split ratios is determined, the liquid phase residence time destribution of gas-liquid mixed flow system is surveyed
Surely there is wide applicability.
Brief description of the drawings
Fig. 1 is the schematic device of measure gas-liquid eddy flow liquid phase residence time destribution；
Fig. 2 is conductivity measurement point partial enlarged drawing；
Fig. 3 is residence time measurement result example；
In figure：1st, liquid phase storage tank；2nd, cyclone separator；3rd, conductivity probe；4th, blower fan；5th, liquid phase feeding pump；6th, liquid phase
Flowmeter；7th, liquid phase feeding valve；8th, tracer inlet；9th, rectifier cell；10th, discharge opeing knockout drum；11st, discharge opeing branch gas phase stream
Gauge；12nd, discharge opeing branch valve；13rd, knockout drum tapping valve；14th, Exhaust branch flowmeter；15th, Exhaust branch valve；16th, electrical conductivity
Instrument；17th, computer；18th, drop；19th, liquid film.
Embodiment
As shown in Figure 1 and Figure 2, the device of gas-liquid eddy flow liquid phase residence time destribution is determined, including：Liquid phase storage tank 1, eddy flow
Separator 2, conductivity probe 3, blower fan 4；Wherein：
Cyclone separator 2 sets liquid phase mixing entrance, top vent, bottom leakage fluid dram；Cyclone separator will be by entering
Mouthful liquid phase blending agent entered is separated, and partial gas phase flows out from top vent pipe, remaining gas phase and whole liquid phases from
Bottom drain flows out；
Liquid phase storage tank 1 is connected with the entrance of cyclone separator 2 by liquid phase feeding pipeline, on the pipe liquid phase feeding pipeline by
The direction of liquid phase storage tank to cyclone separator is sequentially provided with liquid phase feeding pump 5, liquid phase flowmeter 6, liquid phase feeding valve 7；Liquid phase is entered
Liquid phase in liquid phase storage tank 1 is pumped to the entrance of cyclone separator 2 by material pump 5, there is provided system liquid phase feeding, liquid phase is by liquid phase flow
Meter 6 is measured, is controlled by liquid phase feeding valve 7；Cyclone separator 2 is separated liquid phase；The entrance of cyclone separator 2
Tracer inlet 8 is connected simultaneously, tracer is injected by tracer inlet 8, tracer is usually NaCl or KCl solution, is shown
Track agent detects outlet conductivity variations by changing liquid phase electrical conductivity, by conductivity probe, and the residence time is obtained through data processing
Distribution；
The bottom leakage fluid dram of cyclone separator 2 is connected by tapping line with blower fan 4, by cyclone separator on tapping line
2 to the direction of blower fan 4 be sequentially provided with rectifier cell 9, conductivity probe 3, discharge opeing knockout drum 10, discharge opeing branch gas phase flow rate meter 11,
Discharge opeing branch valve 12；Continuous liquid film 19 of the rectifier cell 9 by the rectification of dispersant liquid drop 18 in discharging tube for adherent flowing, is easy to electricity
The effectively measure liquid phase electrical conductivity of conductance probe 3；The bottom of discharge opeing knockout drum 10 is provided with knockout drum tapping valve 13, and discharge opeing knockout drum 10 will
The liquid phase and unsegregated gas phase of the bottom of cyclone 2 outflow are separated again, and liquid phase is discharged by the tapping valve 13 of knockout drum lower curtate, gas
Emptied after being mutually inhaled into blower fan 4；Gas phase in discharging tube is measured by discharge opeing affluent-dividing gauge 11, is carried out by discharge opeing branch valve 12
Control.
The top vent of cyclone separator 2 is connected by exhaust line with blower fan 4, and blast pipe to the direction of blower fan 4 is set successively
There are Exhaust branch flowmeter 14, Exhaust branch valve 15；Gas phase is measured by Exhaust branch flowmeter 14 in blast pipe, passes through exhaust point
Branch valve 15 is controlled.
Conductivity probe 3 is connected by signal wire with conductivity meter 16, the mould that conductivity meter 16 exports conductivity probe 3
Intend signal and be converted to data signal, and be transferred to computer 17, data record is carried out, to obtain liquid phase residence time destribution.
The method for determining gas-liquid eddy flow liquid phase residence time destribution, using the said determination gas-liquid eddy flow liquid phase residence time point
The device of cloth, comprises the following steps：
(1), start liquid phase feeding pump 5, liquid phase in liquid phase storage tank 1 is pumped into the entrance of cyclone separator 2, adjusts liquid phase feeding
The aperture of valve 7, the show value of liquid phase flowmeter 6 is reached experiment setting value, record liquid phase flow rate；
(2), start blower fan 4, gas phase is sucked by the entrance of cyclone separator 2, adjustment Exhaust branch valve 15 and discharge opeing branch
Valve 12, to control gas phase split ratio, discharge opeing branch gas phase flow rate meter 11 and Exhaust branch flowmeter 14 is set to reach setting value, respectively
Record exhaust and discharge opeing branch gas phase flow rate, can be calculated gas phase split ratio：
Gas phase split ratio=cyclone blast pipe gas phase flow rate/cyclone inlet gas phase flow rate
(3), after device is stable, tracer, while the timing by computer are injected by tracer inlet 8；
Tracer is usually NaCl or KCl solution, and injection mode can be impulses injection or step injection, using grooved faces or insertion
Formula conductivity probe 3 determines liquid phase electrical conductivity, and measurement signal is sent to computer 17 through conductivity meter 16, carry out signal-obtaining and
Record, residence time destribution is calculated by following formula
Wherein, CiFor each moment electrical conductivity of computer record, Δ tiFor data record time step, E (t) is when stopping
Between distribution probability.
Fig. 3 show cyclone separator entrance gas velocity 16m/s, the liquid phase residence time determined during liquid phase volume content 1%
Distribution results.
Claims (4)
1. a kind of device for determining gas-liquid eddy flow liquid phase residence time destribution, including：Liquid phase storage tank, cyclone separator, electrical conductivity
Probe, blower fan；It is characterized in that：Cyclone separator sets liquid phase mixing entrance, top vent, bottom leakage fluid dram；Liquid phase
Storage tank is connected with the entrance of cyclone separator by liquid phase feeding pipeline, by liquid phase storage tank to cyclonic separation on liquid phase feeding pipeline
The direction of device is sequentially provided with liquid phase feeding pump, liquid phase flowmeter, liquid phase feeding valve；The entrance of cyclone separator connects tracer simultaneously
Agent inlet, tracer is injected by tracer inlet；The bottom leakage fluid dram of cyclone separator passes through tapping line and blower fan phase
Even, rectifier cell, conductivity probe, discharge opeing knockout drum, row are sequentially provided with by cyclone separator to blower fan direction on tapping line
Liquid branch gas phase flow rate meter, discharge opeing branch valve；Cyclone separator top vent is connected by exhaust line with blower fan, blast pipe
Exhaust branch flowmeter, Exhaust branch valve are sequentially provided with to blower fan direction；Conductivity probe passes through signal wire and conductivity meter phase
Even, the analog signal that conductivity probe exports is converted to data signal by conductivity meter, and is transferred to computer, carries out data note
Record, to obtain liquid phase residence time destribution；Tracer is NaCl or KCl solution.
A kind of 2. method for determining gas-liquid eddy flow liquid phase residence time destribution, using the measure gas-liquid eddy flow described in claim 1
The device of liquid phase residence time destribution, it is characterised in that comprise the following steps：
(1), start liquid phase feeding pump, liquid phase in liquid phase storage tank be pumped into cyclone separator entrance, adjusts liquid phase feeding valve opening,
Liquid phase flowmeter show value is reached experiment setting value, record liquid phase flow rate；
(2), start blower fan, gas phase is sucked by cyclone separator entrance, adjust Exhaust branch valve and discharge opeing branch valve, with control
Gas phase split ratio, discharge opeing branch gas phase flow rate meter and Exhaust branch flowmeter is set to reach setting value, respectively record exhaust and discharge opeing
Branch's gas phase flow rate, gas phase split ratio can be calculated：
Gas phase split ratio=cyclone blast pipe gas phase flow rate/cyclone inlet gas phase flow rate
(3), after device is stable, tracer, while the timing by computer are injected by tracer inlet；Using end
Face is slotted or plug-in type conductivity probe measure liquid phase electrical conductivity, measurement signal are sent to computer through conductivity meter, carry out letter
Number read and record, residence time destribution is calculated by following formula
<mrow>
<mi>E</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<msub>
<mi>C</mi>
<mi>i</mi>
</msub>
<mrow>
<msub>
<mi>&Sigma;C</mi>
<mi>i</mi>
</msub>
<msub>
<mi>&Delta;t</mi>
<mi>i</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, CiFor each moment electrical conductivity of computer record, Δ tiFor data record time step, E (t) is the residence time point
Cloth probability.
3. the method for measure gas-liquid eddy flow liquid phase residence time destribution according to claim 2, it is characterised in that using whole
Continuous liquid film of the fluid element by the dispersant liquid drop rectification in discharging tube for adherent flowing.
4. the method for measure gas-liquid eddy flow liquid phase residence time destribution according to claim 3, it is characterised in that institute's electricity consumption
Conductance probe is grooved faces or plug-in type conductivity probe.
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| CN106932445A (en) * | 2017-03-03 | 2017-07-07 | 四川龙蟒钛业股份有限公司 | A kind of method of mean residence time and distribution of the test titanium white slurry in sand mill |
| CN107421999A (en) * | 2017-06-19 | 2017-12-01 | 天津大学 | Biphase gas and liquid flow plays rotation phase-splitter |
| CN108256197B (en) * | 2018-01-10 | 2021-10-22 | 四川大学 | Method for determining residence time of water body in energy dissipation pool |
| CN110672542A (en) * | 2019-09-26 | 2020-01-10 | 清华大学 | Device and method for on-line measuring residence time distribution in liquid-liquid and gas-liquid continuous reactor |
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