CN103105194B - Pulsed extraction column parameter blowing measurement and interface control method - Google Patents

Abstract

The invention relates to parameter calculation of liquid level, interface, density and column weight of a pulsed extraction column in spent fuel reprocessing technology in a nuclear power plant, in particular to a pulsed extraction column parameter blowing measurement and interface control method which aims at accurately calculating measuring parameter values of the pulsed extraction column, enabling the value to stably and truly reflect the field working conditions, adjusting and controlling a system interface, and ensuring stable operation of a pulsed extraction column system. The measurement method includes a first step of collecting parameters participating in calculation, a second step of carrying out data smoothing, and a third step of obtaining the pulsed extraction column parameter through pressure difference data calculation. Through actual using verification, the method can accurately measure the parameters of the pulsed extraction column, such as the liquid level, the column weight, the interface and the like in the process of pulsed extraction column parameter measurement, and provides reliable guarantee to the process operations.

Description

Pulse extraction column parameter is blown and is measured and interface control method

Technical field

The present invention relates to the calculating being applied to pulse extraction post liquid level in Nuclear Power Station's Exhausted Fuels aftertreatment technology, interface, density, the heavy parameter of post; Relate to pulse extraction post interface regulable control further.

Background technology

Pulse extraction post grows up according to the needs of Nuclear Power Station's Exhausted Fuels aftertreatment in the sixties in last century, in the commercial Application of four more than ten years subsequently, the advantage of the structure that pulse extraction post has and extraction efficiency aspect, make it be used widely in spentnuclear fuel aftertreatment, also become one of key equipment in highly active waste separation process.

Pulse extraction post is mainly used in extraction and back-extraction in spentnuclear fuel aftertreatment pilot plant (pilot plant) art production process, and its ruuning situation directly has influence on art production process.In the operational process of pulse extraction post, mainly by liquid level, interface, post heavily etc. parameter supervise the ruuning situation of pillar, to facilitate the judgement of process operator.

In spentnuclear fuel processing procedure, due to the radioactivity of spentnuclear fuel, pulse extraction post is all installed among hot cell, which kind of measuring method is selected to realize the measurement of the key parameters such as this kind equipment liquid level, interface, post weight and turned letter signal, it is a very important link, the measuring method selected should realize the Measurement accuracy of parameter, also will be convenient to the maintenance under the condition of hot cell, repair and maintenance simultaneously.

Radioactive nucleus facility many employings rod-type instrument that China is old, this type of instrument measurement precision is low, maintenance difficulty, radioactivity are high, easily pollutes maintainer and power house environment, has been unsuitable for measuring needs; Some Novel meters, although as high in ultrasonic level gage, densitometer, interface instrument measuring accuracy, stable performance, also can complete surveying work, there is the repair and maintenance problem of instrument under strong radiation environment; Final selection adopts to blow measures this measuring technique, weighs and the isoparametric measurement of turned letter signal, for process system stable operation provides reliable data foundation to realizing pulse extraction post liquid level, interface and post rapidly and accurately.

But, at present, also do not have the pulse extraction column parameter that can be applied to Nuclear Power Station's Exhausted Fuels aftertreatment industrial site to blow and measure and interface control method.

Summary of the invention

The object of this invention is to provide a kind of method, accurately calculate pulse extraction post measured parameter value, and this numerical value is stablized reflect field working conditions really, carry out system interface regulable control, ensure the stable operation of pulse extraction column system.

The present invention is achieved in that a kind of pulse extraction column parameter air blowing measuring method, wherein, comprises the steps:

Step one, collection participate in the parameter calculated;

Gather the differential pressure signal Δ P obtained by blowing method measurement _i, Δ P _w, Δ P _do, Δ P _da, Δ P _l, unit kPa;

Wherein, Δ P _ifor interface level measurement pressure differential, unit: Kpa, is measured by 2 gas blow pipes;

In the extraction course of work, interfacial level in pulse extraction post is required to be within predetermined control survey scope, 2 gas blow pipes (Y3-190, Y3-191) are arranged respectively at the upper and lower bound place of this altitude range, 2 gas blow pipes are connected respectively to differential pressure transmitter, and the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _i, ask poor process to be completed by differential pressure transmitter;

Δ P _w---post remeasurement pressure differential, kPa; Measured by 2 gas blow pipes, arrange 2 gas blow pipes (Y3-177, Y3-189) respectively in the plate section top and bottom of pulse extraction post, the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _w, ask poor process to be completed by differential pressure transmitter;

Δ P _l---level gauging pressure differential, kPa; Measured by 2 gas blow pipes, arrange 1 upper pipe (Y3-176) in atmosphere, as canonical reference pipe, under other 1, pipe to be arranged in expanding reach bottom (Y3-177), and the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _l, ask poor process to be completed by differential pressure transmitter;

Δ P _do, Δ P _da---density measure pressure differential, corresponds respectively to organic phase and aqueous phase, kPa;

Arrange 2 groups totally 4 gas blow pipes respectively the pressure reduction of organic phase and aqueous phase is measured, when corresponding to extraction, aqueous phase is continuously and the continuous both of these case of organic phase, arranges respectively,

For aqueous phase continuous print situation, in the case, interface, at the upper expanding reach of extraction column, arranges 4 gas blow pipes at upper expanding reach;

The upper pipe surveying aqueous phase densities is at interface control measurement range lower limit place, and the lower pipe surveying aqueous phase densities is in plate section upper end; 2 pipe pressures ask difference to obtain Δ P _da;

The upper pipe surveying organic phase density is independent setting, below liquid level, more than interface control uppe r limit of measurement range; Survey the lower pipe of organic phase density at interface control uppe r limit of measurement range place; 2 pipe pressures ask difference to obtain Δ P _do;

For organic phase continuous print situation, in the case, interface, at the lower expanding reach of extraction column, arranges 4 gas blow pipes at lower expanding reach;

Survey the upper pipe of aqueous phase densities at the lower limit place (Y3-191) of interface control measurement range, the lower pipe surveying aqueous phase densities is arranged separately (Y3-192), below interface control measurement range lower limit;

Survey the lower pipe of organic phase density at interface control uppe r limit of measurement range place (Y3-190); Survey the upper pipe of organic phase density in the lower end (Y3-189) of plate section;

While the above-mentioned change parameter of measurement, obtain the gas blow pipe tube pitch H of the reality prestored _i, H _do, H _da, H _w, H _i, unit (mm);

Step 2, carry out data smoothing;

To average algorithm to the data that scene is come, this algorithm is:

OUT＝(IN _n+IN _n-1+........IN _n-19) n＝20

The data of process comprise: measuring-signal Δ P _i, Δ P _w, Δ P _do, Δ P _do, Δ P _l;

Step 3, calculate extraction column parameter by differential pressure data;

(1) bulk density

D＝(ΔP _D*10 ³)/(H _D*g)

In formula:

H _d---2 density measure gas blow pipe potential differences, mm; Can represent respectively: H _do, H _da;

Δ P _d---density measure pressure differential, is recorded by differential pressure transmitter DT, kPa; Can represent respectively: Δ P _do, Δ P _da;

D---density g/cm ³; Can represent respectively: D _o, D _a;

(2) liquid level is calculated;

In upper expanding reach, time for aqueous phase continuous print, it is two-phase feed liquid; Time for organic phase continuous print, it is Single Medium;

Single Medium: L=(Δ P _l* 10 ³)/(D _o* g)

Two-phase feed liquid: L=((Δ P _l-Δ P _i) * 10 ³)/(D _o* g)+H _i

Δ P _l---level gauging pressure differential, is recorded by differential pressure transmitter LT, kPa;

Δ P _i---interface level measurement pressure differential, is recorded by differential pressure transmitter LiT, kPa;

D _o---organic phase density, g/cm ³;

H _i---2 interface level measurement gas blow pipe potential differences, mm;

L---liquid level, mm;

(3) the intersegmental fluid density of computing board;

D _w＝(ΔP _W*103)/(H _W*g)

In formula:

H _w---post remeasurement gas blow pipe potential difference, mm;

D _w---the density of pulse extraction post plate intersegmental aqueous phase organic phase mixed liquor, g/cm ³;

Δ P _w---the pressure reduction that post remeasurement differential pressure transmitter WT records, kPa;

After measurement obtains density, use it for other and calculate, both can obtain the heavy parameter of post, so gas blow pipe is herein called post remeasurement gas blow pipe.

(4) interface location is calculated;

Formula is 1.: $\mathrm{Li}=\frac{1000\×\mathrm{\ΔPi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}$

Formula is 2.: $\mathrm{Li}=\frac{1000\×\mathrm{\ΔPi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}+H_{\mathrm{Da}}$

L _i---interface (unit: mm)

Δ P _i---interface level measurement pressure (unit: Kpa)

H _i---survey the tube pitch of interface two gas blow pipes

D _o---organic phase density;

D _a---aqueous phase densities;

G---acceleration of gravity 9.798m/s ²

1. formula is organic phase continuous print pillar algorithm, and 2. formula is aqueous phase continuous print pillar algorithm.

A kind of pulse extraction post interface control method, wherein, comprises the steps:

Step 1, judge whether Presence of an interface:

Calculate the density of liquid between 2 gas blow pipes for interface level measurement;

D _i＝(ΔP _i*10 ³)/(H _i*g)

Δ P _i---interface level measurement pressure, unit: Kpa;

H _i---survey the tube pitch of interface two gas blow pipes;

G---acceleration of gravity 9.798m/s ²;

If D _iclose to aqueous phase densities, then think that interface exceedes control survey range limit; If D _iclose to organic phase density, then think that interface exceedes control survey range lower limit; Close criterion is that difference is less than or equal to 0.02g/cm ³; Now, not Presence of an interface is judged as; Otherwise, be judged as Presence of an interface;

Step 2, adjustment;

Not Presence of an interface, when exceeding control survey scope, by technologist's manual adjustments;

When Presence of an interface, automatically control; When the interface that measurement obtains is lower than predetermined value, from lower expanding reach charging, namely add aqueous phase, when the interface that measurement obtains is higher than predetermined value, carries material from lower expanding reach, namely discharge aqueous phase.

Advantage of the present invention is: use checking through actual, said method when pulse extraction column parameter is measured, can the parameter of ranging pulse extraction column exactly as liquid level, post weight, interface etc., for technological operation provides reliable guarantee.

Accompanying drawing explanation

In Fig. 1 embodiment, be organic phase consecutive hours, gas blow pipe pulse extraction rod structure schematic diagram has been installed.

Wherein, Y3-176, Y3-177, Y3-189, Y3-190, Y3-191, Y3-192 gas blow pipe;

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described further:

The present invention is applied to pulse extraction post, its structure as shown in Figure 1, upper end is upper expanding reach, centre is plate section, and lower end is lower diffuser, in lower diffuser, be provided with and periodically blast gas, make the medium of extraction column produce the pulse leg of pulse ripple, in process of production, need to measure the correlation parameter of extraction column.Owing to can not adopt the metering system of contact, use blowning installation as the primary device of noncontact parameter measurement, its measured value unit is differential pressure, is converted into the engineering unit needed for operating personnel, and this needs the computing method taking a set of science.The running environment of above-mentioned pulse extraction post is dynamically beat impulsive condition, this parameter can be stablized, reflect on-the-spot actual condition really, the interphase (abbreviation interface) participating in different medium in pulse extraction post highly regulates, ensure the stable operation of pulse extraction column system, this is a gordian technique.In addition, during pulsed column interface level measurement, to judge in predetermined control measurement range whether Presence of an interface, interface refers to the interphase of aqueous phase and organic phase in extraction column, is to carry out the key that interfacial level calculating and interface regulate.

Method in the present embodiment specifically comprises the steps:

Step one, collection participate in the parameter calculated;

By the differential pressure signal Δ P that the direct collection site pressure difference transmitter of I/O acquisition module is measured _i, Δ P _w, Δ P _do, Δ P _da, Δ P _l, unit kPa;

Wherein, Δ P _ifor interface level measurement pressure differential, unit: Kpa, is measured by 2 gas blow pipes;

In the extraction course of work, interfacial level in extraction column is required to be within predetermined control survey scope, 2 gas blow pipes (Y3-190, Y3-191) are arranged respectively at the upper and lower bound place of this altitude range, 2 gas blow pipes are connected respectively to differential pressure transmitter, and the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _i, ask poor process to be completed by differential pressure transmitter;

Δ P _w---post remeasurement pressure differential, kPa; Measured by 2 gas blow pipes, 2 gas blow pipes (Y3-177, Y3-189) are arranged respectively in the top and bottom of the center section of extraction column, center section fingering row aqueous phase and organic phase carry out the part mixed, be also called plate section, the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _w, ask poor process to be completed by differential pressure transmitter;

Δ P _l---level gauging pressure differential, kPa; Measured by 2 gas blow pipes, arrange 1 upper pipe (Y3-176) in atmosphere, as canonical reference pipe, under other 1, pipe is arranged on bottom in expanding reach, herein, can share (Y3-177) that use when measurement column weighs, the gas blow pipe arranged in the upper end of the center section (plate section) of pillar;

Δ P _do, Δ P _da---density measure pressure differential, corresponds respectively to organic phase and aqueous phase, kPa;

Arrange 2 groups totally 4 gas blow pipes respectively the pressure reduction of organic phase and aqueous phase is measured, when corresponding to extraction, aqueous phase is continuously and continuous these the two kinds different situations of organic phase, is arranged in diverse location,

For aqueous phase continuous print situation, in the case, interface, at the upper expanding reach of extraction column, arranges 4 gas blow pipes at upper expanding reach;

The upper pipe surveying aqueous phase densities is the lower pipe (interface control measurement range lower limit place) surveying interface, and the heavy upper pipe (plate section upper end) of post surveyed by the lower pipe surveying aqueous phase densities; 2 pipe pressures ask difference to obtain Δ P _da;

The upper pipe surveying organic phase density is independent setting, at liquid level (i.e. spout hole) below, more than interface (control survey range limit); The lower pipe surveying organic phase density shares with the upper pipe (interface control uppe r limit of measurement range place) surveying interface; 2 pipe pressures ask difference to obtain Δ P _do;

For organic phase continuous print situation, in the case, interface, at the lower expanding reach of extraction column, arranges 4 gas blow pipes at lower expanding reach;

The upper pipe surveying aqueous phase densities shares (the lower limit place of interface control measurement range) (Y3-191) with the lower pipe surveying interface, the lower pipe surveying aqueous phase densities is arranged separately (Y3-192), below interface control measurement range lower limit, be 30mm ~ 50mm bottom expanding reach under extraction column herein;

The lower pipe surveying organic phase density shares (Y3-190) with the upper pipe surveying interface; The heavy lower pipe (lower end of plate section) (Y3-189) of post surveyed by the upper pipe surveying organic phase density;

While the above-mentioned change parameter of measurement, obtain the gas blow pipe tube pitch H of the reality prestored _i, H _do, H _da, H _w, H _i, unit (mm);

Step 2, carry out data smoothing;

To average algorithm to the data that scene is come, this algorithm is:

OUT＝(IN _n+IN _n-1+........IN _n-19) n＝20

This algorithm is that the data obtained by Real-time Collection are averaging together with front 19 data, and this method of averaging can make data keep real-time, the abnormal numerical value simultaneously occurred in more level and smooth data collection cycles; Our data collection cycle is decided to be 500ms, and the collection period of 20 data is 10000ms, and exchangeable bases is 10s, can meet the real-time display to data and control control overflow;

The data of process comprise: measuring-signal Δ P _i, Δ P _w, Δ P _do, Δ P _do, Δ P _l;

Step 3, calculate extraction column parameter by differential pressure data;

(1) bulk density

D＝(ΔP _D*10 ³)/(H _D*g)

In formula:

H _d---2 density measure gas blow pipe potential differences, mm; Can represent respectively: H _do, H _da;

Δ P _d---density measure pressure differential, is recorded by differential pressure transmitter DT, kPa; Can represent respectively: Δ P _do, Δ P _da;

D---density g/cm ³; Can represent respectively: D _o, D _a;

(2) liquid level is calculated;

Single Medium: L=(Δ P _l* 10 ³)/(D _o* g)

Containing two-phase feed liquid: L=((Δ P _l-Δ P _i) * 10 ³)/(D _o* g)+H _i

Δ P _l---level gauging pressure differential, is recorded by differential pressure transmitter LT, kPa;

Δ P _i---interface level measurement pressure differential, is recorded by differential pressure transmitter LiT, kPa;

D _o---organic phase density, g/cm ³;

H _i---2 interface level measurement gas blow pipe potential differences, mm;

L---liquid level, mm;

Single Medium, two-phase feed liquid refer to the media quantity in expanding reach, aqueous phase continuously (ratio many be continuous phase, few be disperse phase) time, be two-phase feed liquid;

When organic phase continuous print, it is Single Medium;

(3) post weight is calculated;

Post is heavily the weight of fingerboard intersegmental pulse extraction post plate intersegmental aqueous phase organic phase mixed liquor, first calculates its density, because volume is known, namely can obtain weight, or directly uses density value also passable;

D _w＝(ΔP _W*10 ³)/(H _W*g)

In formula:

H _w---post remeasurement gas blow pipe potential difference, mm;

D _w---the density of pulse extraction post plate intersegmental aqueous phase organic phase mixed liquor, g/cm3;

Δ P _w---the pressure reduction that post remeasurement differential pressure transmitter WT records, kPa;

(4) interface location is calculated;

Formula is 1.: $\mathrm{Li}=\frac{1000\×\mathrm{Pi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}$

Formula is 2.: $\mathrm{Li}=\frac{1000\×\mathrm{Pi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}+H_{\mathrm{Da}}$

L _i---interface (unit: mm)

P _i---interface level measurement pressure (unit: Kpa)

H _i---survey the tube pitch of interface two gas blow pipes

D _o---organic phase density (is set by operator, unit: g/cm herein ³)

D _a---aqueous phase densities (is set by operator, unit: g/cm herein ³)

As Δ P _dmeasured value is comparatively large by impulse disturbances, the D calculated _o, D _aerror is excessive, cannot be used for interface level measurement and control, is directly set according to the actual samples to medium, analysis result by operator;

G---acceleration of gravity 9.798m/s ²

1. formula is organic phase continuous print pillar algorithm, and 2. formula is aqueous phase continuous print pillar algorithm;

Step 4, participation control;

Pulse extraction post interface control is very crucial regulating system; The quality of this regulating system decides extraction function and the security performance of pulse extraction post; Figure below is pulse extraction post interface regulating-controlling program block; By carrying out regulable control to through step one to the interface numerical value that step 3 obtains, finally reach the stable operation of pulse extraction post;

1, Presence of an interface is judged whether:

Calculate the density of liquid between 2 gas blow pipes for interface level measurement;

Use the density calculation formula same with (1):

(1) density measure operational formula

D _i＝(ΔP _i*10 ³)/(H _i*g)

If D _iclose to aqueous phase densities (0.02, unit: g/cm ³), then think that interface exceedes control survey range limit;

If D _iclose to organic phase density, then think that interface exceedes control survey range lower limit;

When exceeding control survey scope, by technologist's manual adjustments;

2, when Presence of an interface, automatically control,

That is: when the interface that measurement obtains is lower than predetermined value, from lower expanding reach charging, namely add aqueous phase, when the interface that measurement obtains is higher than predetermined value, carries material from lower expanding reach, namely discharge aqueous phase.

By said process, all can complete the Measurement accuracy to extraction column parameter, and further realize automatically controlling.

After controlling, return step one.

The tube pitch used in above-mentioned steps is constant, is before carrying out the method, is measured by site physical, as used the instruments such as tape measure, determines gas blow pipe tube pitch H _ih _dh _wh _i, unit (mm), the above-mentioned parameter after determining is constant.

Further, the above-mentioned gas blow pipe tube pitch H determined can also be verified by differential pressure method _ih _dh _wh _i, unit (mm), contrasts with in-site measurement value, verifies mutually.

The computing etc. of the compensation air blowing parameter measurement of pulse extraction cornice aqueous phase and organic phase fluid density is all realized by DCS system, and these are in the enterprising line program exploitation of SIMATIC PCS7.

In said process, according to this fundamental formular of Δ P=ρ gh, in conjunction with actual conditions, derive the computing formula being suitable for each measurement parameter that pulse extraction post uses.Wherein.Aqueous phase should be had any different continuously and in organic phase continuous print pillar interfacial level computing method.

In addition, consider the dynamic operating condition of pulse extraction post, measurement parameter is larger by impulse disturbances, although by certain steady effect can be played in means such as gas blow pipe reload buffer tanks, but interface is regulated, this fluctuation of parameter is still very large, therefore add data processing method smoothly blow measure parameter values.

Claims (2)

1. a pulse extraction column parameter air blowing measuring method, is characterized in that, comprise the steps:

Step one, collection participate in the parameter calculated;

Gather the differential pressure signal Δ P obtained by blowing method measurement _i, Δ P _w, Δ P _do, Δ P _da, Δ P _l, unit kPa;

Wherein, Δ P _ifor interface level measurement pressure differential, unit: Kpa, is measured by 2 gas blow pipes;

In the extraction course of work, interfacial level in pulse extraction post is required to be within predetermined control survey scope, 2 gas blow pipes (Y3-190, Y3-191) are arranged respectively at the upper and lower bound place of this altitude range, 2 gas blow pipes are connected respectively to differential pressure transmitter, and the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _i, ask poor process to be completed by differential pressure transmitter;

Δ P _w---post remeasurement pressure differential, kPa; Measured by 2 gas blow pipes, arrange 2 gas blow pipes (Y3-177, Y3-189) respectively in the plate section top and bottom of pulse extraction post, the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _w, ask poor process to be completed by differential pressure transmitter;

Δ P _l---level gauging pressure differential, kPa; Measured by 2 gas blow pipes, arrange 1 upper pipe (Y3-176) in atmosphere, as canonical reference pipe, under other 1, pipe to be arranged in expanding reach bottom (Y3-177), and the single tube pressure that the single tube pressure of lower pipe deducts pipe obtains Δ P _l, ask poor process to be completed by differential pressure transmitter;

Δ P _do, Δ P _da---density measure pressure differential, corresponds respectively to organic phase and aqueous phase, kPa;

Arrange 2 groups totally 4 gas blow pipes respectively the pressure reduction of organic phase and aqueous phase is measured, when corresponding to extraction, aqueous phase is continuously and the continuous both of these case of organic phase, arranges respectively,

For aqueous phase continuous print situation, in the case, interface, at the upper expanding reach of extraction column, arranges 4 gas blow pipes at upper expanding reach;

The upper pipe surveying aqueous phase densities is at interface control measurement range lower limit place, and the lower pipe surveying aqueous phase densities is in plate section upper end; 2 pipe pressures ask difference to obtain Δ P _da;

The upper pipe surveying organic phase density is independent setting, below liquid level, more than interface control uppe r limit of measurement range; Survey the lower pipe of organic phase density at interface control uppe r limit of measurement range place; 2 pipe pressures ask difference to obtain Δ P _do;

For organic phase continuous print situation, in the case, interface, at the lower expanding reach of extraction column, arranges 4 gas blow pipes at lower expanding reach;

Survey the upper pipe of aqueous phase densities at the lower limit place (Y3-191) of interface control measurement range, the lower pipe surveying aqueous phase densities is arranged separately (Y3-192), below interface control measurement range lower limit;

Survey the lower pipe of organic phase density at interface control uppe r limit of measurement range place (Y3-190); Survey the upper pipe of organic phase density in the lower end (Y3-189) of plate section;

While the above-mentioned change parameter of measurement, obtain the gas blow pipe tube pitch H of the reality prestored _i, H _do, H _da, H _w, unit (mm);

Step 2, carry out data smoothing;

To average algorithm to the data that scene is come, this algorithm is:

OUT＝(IN _n+IN _n-1+........IN _n-19) n＝20

The data of process comprise: measuring-signal Δ P _i, Δ P _w, Δ P _do, Δ P _da, Δ P _l;

Step 3, calculate extraction column parameter by differential pressure data;

(1) bulk density

D＝(ΔP _D*10 ³)/(H _D*g)

In formula:

H _d---2 density measure gas blow pipe potential differences, mm; Can represent respectively: H _do, H _da;

Δ P _d---density measure pressure differential, is recorded by differential pressure transmitter DT, kPa; Can represent respectively: Δ P _do, Δ P _da;

D---density g/cm ³; Can represent respectively: D _o, D _a;

(2) liquid level is calculated;

In upper expanding reach, time for aqueous phase continuous print, it is two-phase feed liquid; Time for organic phase continuous print, it is Single Medium;

Single Medium: L=(Δ P _l* 10 ³)/(D _o* g)

Two-phase feed liquid: L=((Δ P _l-Δ P _i) * 10 ³)/(D _o* g)+H _i

Δ P _l---level gauging pressure differential, is recorded by differential pressure transmitter LT, kPa;

Δ P _i---interface level measurement pressure differential, is recorded by differential pressure transmitter LiT, kPa;

D _o---organic phase density, g/cm ³;

H _i---2 interface level measurement gas blow pipe potential differences, mm;

L---liquid level, mm;

(3) the intersegmental fluid density of computing board;

D _w＝(ΔP _W*10 ³)/(H _W*g)

In formula:

H _w---post remeasurement gas blow pipe potential difference, mm;

D _w---the density of pulse extraction post plate intersegmental aqueous phase organic phase mixed liquor, g/cm3;

Δ P _w---the pressure reduction that post remeasurement differential pressure transmitter WT records, kPa;

(4) interface location is calculated;

Formula is 1.: $\mathrm{Li}=\frac{1000\×\mathrm{\ΔPi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}$

Formula is 2.: $\mathrm{Li}=\frac{1000\×\mathrm{\ΔPi}-\mathrm{Hi}\×\mathrm{Do}\×g}{(\mathrm{Da}-\mathrm{Do})\×g}+H_{\mathrm{Da}}$

L _i---interface (unit: mm)

Δ P _i---interface level measurement pressure (unit: Kpa)

H _i---survey the tube pitch of interface two gas blow pipes

D _o---organic phase density;

D _a---aqueous phase densities;

G---acceleration of gravity 9.798m/s ²

1. formula is organic phase continuous print pillar algorithm, and 2. formula is aqueous phase continuous print pillar algorithm.

2. a pulse extraction post interface control method, is characterized in that, comprises the steps:

Step 1, judge whether Presence of an interface:

Calculate the density of liquid between 2 gas blow pipes for interface level measurement;

D _i＝(ΔP _i*10 ³)/(H _i*g)

Δ P _i---interface level measurement pressure, unit: Kpa;

H _i---survey the tube pitch of interface two gas blow pipes;

G---acceleration of gravity 9.798m/s ²;

If D _iclose to aqueous phase densities, then think that interface exceedes control survey range limit; If D _iclose to organic phase density, then think that interface exceedes control survey range lower limit; Close criterion is that difference is less than or equal to 0.02g/cm ³; Now, not Presence of an interface is judged as; Otherwise, be judged as Presence of an interface;

Step 2, adjustment;

Not Presence of an interface, when exceeding control survey scope, by technologist's manual adjustments;

When Presence of an interface, automatically control; When the interface that measurement obtains is lower than predetermined value, from lower expanding reach charging, namely add aqueous phase, when the interface that measurement obtains is higher than predetermined value, carries material from lower expanding reach, namely discharge aqueous phase.