CN103105194A - 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

The pulse extraction column parameter is blown and is measured and interface control method

Technical field

The present invention relates to be applied to the calculating of pulse extraction post liquid level in the Nuclear Power Station's Exhausted Fuels aftertreatment technology, interface, density, the heavy parameter of post; Further relating to the interface adjusting of pulse extraction post controls.

Background technology

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

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

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

The old radioactive nucleus facility of China adopts the rod-type instrument more, and this type of instrument measurement precision is low, maintenance is difficult, radioactivity is high, easily maintainer and power house environment is polluted, and has been unsuitable for measuring needs; Although as high in ultrasonic level gage, densitometer, interface instrument measuring accuracy, stable performance also can be completed surveying work, there is the repair and maintenance problem of instrument under strong radiation environment in some Novel meters; The final this measuring technique of employing air blowing measurement of selecting heavily reaches the isoparametric measurement of turned letter signal to realizing rapidly and accurately pulse extraction post liquid level, interface and post, for process system stable operation provides reliable data foundation.

But, at present, also there is no to be applied to pulse extraction column parameter air blowing measurement and the interface control method at Nuclear Power Station's Exhausted Fuels aftertreatment commercial production scene.

Summary of the invention

The purpose of this invention is to provide a kind of method, accurately calculate pulse extraction post measured parameter value, and make this numerical value can stablize real reflection field working conditions, carry out system interface and regulate control, guarantee 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 1, collection participate in the parameter of calculating;

The pressure differential signal delta P that collection measures by blowing method _i, Δ P _W, Δ P _Do, Δ P _Da, Δ P _L, the kPa of unit;

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

In the extraction course of work, within interfacial level in the pulse extraction post is required to be in predetermined control survey scope, upper and lower bound place at this altitude range arranges respectively 2 gas blow pipes (Y3-190, Y3-191), 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 respectively 2 gas blow pipes (Y3-177, Y3-189) 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 in air on pipe (Y3-176), as the canonical reference pipe, pipe is arranged on bottom (Y3-177) in expanding reach under other 1, 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---the density measure pressure differential corresponds respectively to organic phase and water, kPa;

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

For the consecutive situation of water, in the case, the interface arranges 4 gas blow pipes at the upper expanding reach of extraction column at upper expanding reach;

The upper pipe of surveying water density is at interface control measurement range lower limit place, and the lower pipe of surveying water density is in plate section upper end; 2 pipe pressures are asked the poor Δ P that obtains _Da

The upper pipe of surveying organic phase density is independent setting, below liquid level, more than the 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 are asked the poor Δ P that obtains _Do

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

Survey the upper pipe of water density at the lower limit place of interface control measurement range (Y3-191), the lower pipe of surveying water density arranges 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 of plate section (Y3-189);

When measuring above-mentioned change parameter, obtain the gas blow pipe tube pitch H of pre-stored reality _i, H _Do, H _Da, H _W, H _i, unit (mm);

Step 2, the data smoothing of carrying out;

The data that the scene the is come algorithm of averaging, this algorithm is:

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

The data of processing comprise: measuring-signal Δ P _i, Δ P _W, Δ P _Do, Δ P _Do, Δ P _L

Step 3, calculate the 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---the density measure pressure differential, DT records by differential pressure transmitter, kPa; Can represent respectively: Δ P _Do, Δ P _Da

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

(2) calculate liquid level;

In upper expanding reach, in the time of consecutive for water, be the two-phase feed liquid; Consecutive the time, be Single Medium for organic;

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---the level gauging pressure differential, LT records by differential pressure transmitter, kPa;

Δ P _i---the interface level measurement pressure differential, LiT records by differential pressure transmitter, 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 the intersegmental water organic phase of pulse extraction post plate mixed liquor, g/cm ³

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

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

(4) calculation interface position;

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 interface with the tube pitch of two gas blow pipes

D _o---organic phase density;

D _a---water density;

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

1. formula is organic consecutive pillar algorithm, and 2. formula is the consecutive pillar algorithm of water.

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

Step 1, judge whether Presence of an interface:

Calculate the density that is used for liquid between 2 gas blow pipes of 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 interface with the tube pitch of two gas blow pipes;

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

If D _iNear water density, think that the interface surpasses the control survey range limit; If D _iNear organic phase density, think that the interface surpasses control survey scope lower limit; The criterion that approaches is that difference is less than or equal to 0.02g/cm ³At this moment, be judged as not Presence of an interface; Otherwise, be judged as Presence of an interface;

Step 2, adjusting;

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

In the time of Presence of an interface, automatically control; During lower than predetermined value, from lower expanding reach charging, namely add water when the interface that measures, during higher than predetermined value, carry material from lower expanding reach when the interface that measures, namely discharge water.

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

Description of drawings

In Fig. 1 embodiment, be the 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

The present invention is described further below in conjunction with the drawings and specific embodiments:

The present invention is applied to the pulse extraction post, its structure as shown in Figure 1, the upper end is upper expanding reach, the centre is the plate section, and the lower end is lower diffuser, in lower diffuser, be equipped 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.Due to the metering system that can not adopt contact, use blowning installation as the primary device of noncontact parameter measurement, its measured value unit is differential pressure, is converted into the required engineering unit of operating personnel, this need to take the computing method of a cover science.The running environment of above-mentioned pulse extraction post is dynamically to beat impulsive condition, make this parameter can stablize, reflect really on-the-spot actual condition, the interphase (abbreviation interface) that participates in different medium in the pulse extraction post is highly regulated, guarantee the stable operation of pulse extraction column system, this is a gordian technique.In addition, during the pulsed column interface level measurement, judgement Presence of an interface whether in the predetermined control measurement range, the interface refers to the interphase of water and organic phase in extraction column, is to carry out the key that interfacial level calculates and the interface is regulated.

Method in the present embodiment specifically comprises the steps:

Step 1, collection participate in the parameter of calculating;

Pressure differential signal delta P by the direct collection site pressure difference transmitter measurement of I/O acquisition module _i, Δ P _W, Δ P _Do, Δ P _Da, Δ P _L, the kPa of unit;

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

In the extraction course of work, within interfacial level in extraction column is required to be in predetermined control survey scope, upper and lower bound place at this altitude range arranges respectively 2 gas blow pipes (Y3-190, Y3-191), 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 top and bottom at the center section of extraction column, the part that center section fingering row water and organic phase are mixed, be called again the 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, pipe (Y3-176) arrange 1 in air on, as the canonical reference pipe, under other 1, pipe is arranged on bottom in expanding reach, herein, can share (Y3-177) that measurement column uses when heavy, the gas blow pipe that arranges in the upper end of the center section (plate section) of pillar;

Δ P _Do, Δ P _Da---the density measure pressure differential corresponds respectively to organic phase and water, kPa;

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

For the consecutive situation of water, in the case, the interface arranges 4 gas blow pipes at the upper expanding reach of extraction column at upper expanding reach;

The upper pipe of surveying water density is the lower pipe (interface control measurement range lower limit place) of surveying the interface, and the lower pipe of surveying water density is to survey the heavy upper pipe (plate section upper end) of post; 2 pipe pressures are asked the poor Δ P that obtains _Da

The upper pipe of surveying organic phase density is independent setting, below liquid level (being spout hole), more than interface (control survey range limit); The lower pipe of surveying organic phase density shares with the upper pipe (interface control uppe r limit of measurement range place) of surveying the interface; 2 pipe pressures are asked the poor Δ P that obtains _Do

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

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

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

When measuring above-mentioned change parameter, obtain the gas blow pipe tube pitch H of pre-stored reality _i, H _Do, H _Da, H _W, H _i, unit (mm);

Step 2, the data smoothing of carrying out;

The data that the scene the is come algorithm of averaging, this algorithm is:

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

This algorithm is that the data that Real-time Collection gets are averaging together with front 19 data, and this method of averaging can make data keep real-time, the abnormal numerical value that occurs in simultaneously 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 satisfy real-time demonstration and control requirement to data;

The data of processing comprise: measuring-signal Δ P _i, Δ P _W, Δ P _Do, Δ P _Do, Δ P _L

Step 3, calculate the 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---the density measure pressure differential, DT records by differential pressure transmitter, kPa; Can represent respectively: Δ P _Do, Δ P _Da

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

(2) calculate liquid level;

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

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

Δ P _L---the level gauging pressure differential, LT records by differential pressure transmitter, kPa;

Δ P _i---the interface level measurement pressure differential, LiT records by differential pressure transmitter, 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, water continuously (ratio many be external phase, few be disperse phase) time, be the two-phase feed liquid;

Organic consecutive the time, be Single Medium;

(3) calculating post weighs;

Post is heavily the weight of the intersegmental water organic phase of the intersegmental pulse extraction post of fingerboard plate mixed liquor, at first calculates its density, because volume is known, namely can obtain weight, perhaps 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 the intersegmental water organic phase of pulse extraction post plate mixed liquor, g/cm3;

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

(4) calculation interface position;

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 interface with the tube pitch of two gas blow pipes

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

D _a---water density (is set unit: g/cm herein by the operator ³)

As Δ P _DMeasured value is subjected to impulse disturbances larger, the D that calculates _o, D _aError is excessive, can't be used for interface level measurement and control, is directly set according to actual samples, analysis result to medium by the operator;

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

1. formula is organic consecutive pillar algorithm, and 2. formula is the consecutive pillar algorithm of water;

Step 4, participation are controlled;

Pulse extraction post interface control is very crucial regulating system; The quality of this regulating system is determining extraction function and the security performance of pulse extraction post; Figure below is pulse extraction post interface regulating-controlling program piece; By to regulating control through step 1 to the interface numerical value that step 3 obtains, finally reach the stable operation of pulse extraction post;

1, judge whether Presence of an interface:

Calculate the density that is used for liquid between 2 gas blow pipes of 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 _iNear water density (0.02, unit: g/cm ³), think that the interface surpasses the control survey range limit;

If D _iNear organic phase density, think that the interface surpasses control survey scope lower limit;

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

2, when Presence of an interface, automatically control,

That is: during lower than predetermined value, from lower expanding reach charging, namely add water when the interface that measures, during higher than predetermined value, carry material from lower expanding reach when the interface that measures, namely discharge water.

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

After controlling, return to step 1.

The tube pitch of using in above-mentioned steps is constant, is before carrying out the method, by on-the-spot physical measurement, as instruments such as use tape measures, determines gas blow pipe tube pitch H _iH _DH _WH _i, unit (mm), the above-mentioned parameter after determining is constant.

And, can also verify the above-mentioned gas blow pipe tube pitch H that has determined by differential pressure method _iH _DH _WH _i, unit (mm) compares with the in-site measurement value, mutually checking.

The computings of the compensation air blowing parameter measurement of pulse extraction cornice water and organic phase fluid density etc. all realize by the 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 of each measurement parameter that is suitable for the use of pulse extraction post.Wherein.Water should be had any different continuously and on organic consecutive pillar interfacial level computing method.

In addition, consider the dynamic operation condition of pulse extraction post, measurement parameter is subjected to impulse disturbances larger, although by playing certain steady effect in means such as gas blow pipe reload buffer tanks, but regulate for the interface, this fluctuation of parameter is still very large, the parameter values that has therefore added data processing method smoothly to blow and measure.

Claims (2)

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

Step 1, collection participate in the parameter of calculating;

The pressure differential signal delta P that collection measures by blowing method _i, Δ P _W, Δ P _Do, Δ P _Da, Δ P _L, the kPa of unit;

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

In the extraction course of work, within interfacial level in the pulse extraction post is required to be in predetermined control survey scope, upper and lower bound place at this altitude range arranges respectively 2 gas blow pipes (Y3-190, Y3-191), 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 respectively 2 gas blow pipes (Y3-177, Y3-189) 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 in air on pipe (Y3-176), as the canonical reference pipe, pipe is arranged on bottom (Y3-177) in expanding reach under other 1, 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---the density measure pressure differential corresponds respectively to organic phase and water, kPa;

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

For the consecutive situation of water, in the case, the interface arranges 4 gas blow pipes at the upper expanding reach of extraction column at upper expanding reach;

The upper pipe of surveying water density is at interface control measurement range lower limit place, and the lower pipe of surveying water density is in plate section upper end; 2 pipe pressures are asked the poor Δ P that obtains _Da

The upper pipe of surveying organic phase density is independent setting, below liquid level, more than the 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 are asked the poor Δ P that obtains _Do

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

Survey the upper pipe of water density at the lower limit place of interface control measurement range (Y3-191), the lower pipe of surveying water density arranges 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 of plate section (Y3-189);

When measuring above-mentioned change parameter, obtain the gas blow pipe tube pitch H of pre-stored reality _i, H _Do, H _Da, H _W, H _i, unit (mm);

Step 2, the data smoothing of carrying out;

The data that the scene the is come algorithm of averaging, this algorithm is:

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

The data of processing comprise: measuring-signal Δ P _i, Δ P _W, Δ P _Do, Δ P _Do, Δ P _L

Step 3, calculate the 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---the density measure pressure differential, DT records by differential pressure transmitter, kPa; Can represent respectively: Δ P _Do, Δ P _Da

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

(2) calculate liquid level;

In upper expanding reach, in the time of consecutive for water, be the two-phase feed liquid; Consecutive the time, be Single Medium for organic;

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---the level gauging pressure differential, LT records by differential pressure transmitter, kPa;

Δ P _i---the interface level measurement pressure differential, LiT records by differential pressure transmitter, 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 the intersegmental water organic phase of pulse extraction post plate mixed liquor, g/cm3;

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

(4) calculation interface position;

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 interface with the tube pitch of two gas blow pipes

D _o---organic phase density;

D _a---water density;

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

1. formula is organic consecutive pillar algorithm, and 2. formula is the consecutive pillar algorithm of water.

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 that is used for liquid between 2 gas blow pipes of 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 interface with the tube pitch of two gas blow pipes;

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

If D _iNear water density, think that the interface surpasses the control survey range limit; If D _iNear organic phase density, think that the interface surpasses control survey scope lower limit; The criterion that approaches is that difference is less than or equal to 0.02g/cm ³At this moment, be judged as not Presence of an interface; Otherwise, be judged as Presence of an interface;

Step 2, adjusting;

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

In the time of Presence of an interface, automatically control; During lower than predetermined value, from lower expanding reach charging, namely add water when the interface that measures, during higher than predetermined value, carry material from lower expanding reach when the interface that measures, namely discharge water.

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