CN100398998C - Crude oil-natural gas-water three-phase flow meter - Google Patents

Abstract

The present invention relates to a crude oil-natural gas-water three-phase flow instrument. The existing three-phase flow instrument mainly uses a venturi tube for measuring three-phase total flow, and a gamma ray is used for measuring three-phase ratio; because the gamma ray is adopted, requirements for safety protection are higher, using ranges of products are limited, and water ratio is difficult to accurately measure. The present invention has the purpose of providing a new crude oil-natural gas-water three-phase flow instrument and a new measuring method. The present invention has the technical scheme that equipment inlet is divided into two paths through a flow type finishing device, a pressure transmitter, a precession eddy flow instrument, a temperature transmitter and parallel gas and liquid resistance balance valves are orderly assembled in one path, and an inverted U-shaped tube, a sampling and analyzing device containing water, a static mixer and the venturi tube are orderly assembled in the other path. The present invention has the advantages that the structure has the method relying on theory to calculate, and empirical ingredients in heat transferring calculation are avoided; therefore, measuring ranges and precision are enormously enhanced, debugging processes are simplified, the measuring ranges are enlarged, application ranges are wide and precision is high.

Description

Crude oil-natural gas-water three-phase flow meter and measuring method thereof

One, affiliated technical field

The present invention relates to a kind of crude oil-natural gas-water three-phase flow meter and measuring method thereof.

Two, background technology

Along with oilfield exploitation, the development of gathering-transferring technology, particularly late nineteen nineties in last century, the oil field is urgent day by day to the demand of crude oil-natural gas-water three-phase flow meter, particularly in the exploitation of marine oil field the three-phase flow instrument is had more urgent demand.The three-phase flow instrument mainly uses Venturi tube to survey the three-phase total flow at present, and gamma-rays is surveyed phase ratio (gas, liquor ratio and oil, water ratio).The method is owing to adopted gamma-rays, security protection is had higher requirements, limited the usable range of this series products significantly, and when gamma-rays is surveyed water percentage (ow ratio), the density of profit as characteristic quantity, is measured water percentage according to the difference of oil, water-mass density, because oil, water-mass density are near (its density ratio was at 0.83: 1 to 0.93: 1), precision is restricted, and particularly when viscous crude (its density is more than 90% of water) state, is difficult to accurately measure water percentage.Also useful in addition specific inductive capacity is as characteristic quantity, use the capacitance measurement water percentage, though the safety problem that the method has avoided gamma-rays to bring, and oil, water specific inductive capacity differ very big, can easier distinguish oil, water, but it is very big that the specific inductive capacity of water is influenced by salinity, influenced measuring accuracy greatly.According to heat transfer principle, oil, the coefficient of heat conductivity of water is measured water percentage as characteristic quantity, but the method is owing to be subjected to oil viscosity variable effect (oil viscosity varies with temperature very big), and because the complicacy of mobile and diabatic process (all rely on experimental formula at present and calculate diabatic process), its range ability is limited to, and the debug process complex limitation application, simultaneously according to Hydrodynamics Theory, measure gas with the inverted U pipe, the method of liquor ratio, the method is owing to influenced seriously by flow pattern, particularly be difficult to accurately measure gas during for annular flow when flow pattern, liquor ratio, and debugging is comparatively complicated.State Intellectual Property Office has announced a kind of " oil-gas-water three phase flow quantity instrument " on October 07th, 1998, and application number is 96236320, and structure is to comprise Venturi tube, sensor, signal acquisition process device.Vertically disposed sampling pipe links to each other with trunk line by the inverted U pipe, and U type pipe measuring section both sides, sampling pipe, Venturi tube are equipped with contactless pressure difference transducer respectively, and each sensor all connects computing machine through A/D converter.Two Venturi horizontal positioned.Temperature sensor, pressure transducer are loaded on respectively in the horizontal trunk line, are provided with valve in the trunk line.

Three, summary of the invention

The objective of the invention is in order to overcome weak point in the above-mentioned background technology, a kind of new crude oil-natural gas-water three-phase flow meter and measuring method thereof are provided, at oilfield exploitation, particularly in the exploitation of marine oil field, enlarge usable range, improve measuring accuracy and usability.The present invention is that the patent applicant invests and carried out big quantity research and experiment development, its principle and measuring method are as characteristic quantity (oil, specific heat of water ratio are about 1: 3) specific heat, from incoming flow, take out partially liq and flow through a well heater with firm discharge, because oil, water specific heat difference, the liquid of different water cut rate can draw water percentage and crude oil-rock gas-water three-phase flow through the temperature difference difference that well heater reached by calculating.

The technical solution adopted for the present invention to solve the technical problems is: crude oil-natural gas-water three-phase flow meter, comprise valve, " U " shape pipe, transmitter, moisture sampling analysis device 12, Venturi tube 22, static mixer 23, it is characterized in that: equipment importation 13 is divided into two-way up and down through flow pattern reorganizer 14; Above one the tunnel be air pipe 18, export to discharge opeing outlet 21 assembling pressure transmitter 15, precession vortex flow instrument 16, temperature transmitter 17 and gas-liquid resistance balance valve 20 in parallel successively from flow pattern reorganizer 14; Below one the tunnel be water oil pipe line 25, from flow pattern reorganizer 14 export to discharge opeing outlet 21 successively assembling have a pressure difference transmitter 3 fall " U " shape pipe 24, static mixer 23, Venturi tube 22, wherein manage 24 decline pipeline sections and connect and contain water-sampling device 12 falling " U " shape.

The present invention solves the technical scheme that its technical matters also adopts:

Described crude oil-natural gas-water three-phase flow meter, it is characterized in that: in containing water-sampling device 12, moisture sampling pipe 10 imports to the loop are successively, import is formed loops through sampler 27, " U " shape pipe 11 that left and right sides pressure difference transmitter 3 is housed, gear-type pump 2, temperature, the compound transmitter 4 of the temperature difference, fall " U " shape pipe 24 and the sampling loop 8 that have a left and right sides heating rod 9, and " U " shape of falling that wherein has heating rod 9 is managed the compound transmitter thermometric of composition loop 5 between the compound transmitter 4 of temperature, the temperature difference of 24 back segments and front.

Described crude oil-natural gas-water three-phase flow meter is characterized in that: manage on 24 tops or the moisture sampling pipe 10 " U " shape that has left and right sides heating rod 9 and be connected and installed with temperature sensor 6.

Described crude oil-natural gas-water three-phase flow meter is characterized in that: connect ball valve 1 in moisture sampling pipe 10 inflow points, connecting oily flow switch 7 on the sampling loop 8 or on the moisture sampling pipe 10.

The measuring method of described crude oil-natural gas-water three-phase flow meter is characterized in that: detected fluid is earlier handled to divide through flow pattern reorganizer 14 and is made two-way, above one the tunnel be most of gas of telling, measure through precession vortex flow instrument 16; Below one the tunnel to be the liquid told and small part gas survey gas, liquor ratio through falling " U " shape pipe 24, mix through static mixer 23, survey total flow Q through Venturi tube again: $Q=C\sqrt{\frac{{\mathrm{\ΔP}}_2}{{\mathrm{\ρ}}_m}}$

In the formula: C: coefficient

Δ P ₂: Venturi tube pressure reduction, the Pa of unit

ρ _m: mixture density, unit K g/m ³

" U " shape of flowing through down at fluid pipe (24) is measured the pressure differential deltap P of this section during the ascent stage ₁, this pressure reduction is by forming with the lower part: Δ P ₁=ρ _mGh+ Δ P _f

In the formula: g: acceleration of gravity, the M/S of unit ²

H: difference in height between the 2 pressure points, the M of unit

Δ P _f: resistance to flow, the Pa of unit

Δ P wherein _fEstimate according to fluid mechanics principle, can obtain ρ _m=(Δ P ₁-Δ P _f)/gh

And while ρ _m=aQ ρ _g+ (1-α) QH ρ _W+ (1-α) Q (1-H) ρ _o

In the formula: α: void fraction

H: the water percentage that can measure by moisture measuring section

ρ _g: known gas density, unit K g/m ³

ρ _W: known water-mass density, unit K g/m ³

ρ _o: known oil density, unit K g/m ³

Q: by the total flow that Venturi tube is measured, the m of unit ³/ S

Thereby obtain α, thereby obtain gas flow Q _g, Q _g=α Q, whole total gas flow rate Q _{G is total}=α Q+Q _{The g table}

Q in the formula _{The g table}By precession vortex flow instrument (16) is surveyed tolerance, the m of unit ³/ S

When fluid is flowed through down " U " shape pipe (24) decline pipeline section, take out partially liq from fluid, this partially liq is extracted out by gear-type pump (2), measures the gas that contains minute quantity in this partially liq by containing water-sampling device (12):

ΔP _xup＝ρ _mxgh _x+ΔP _fx

ΔP _xdown＝ΔP _fx-ρ _mxgh _x

2P _xdowngh _x＝ΔP _fx-ΔP _xdown

ρ _mx＝(ΔP _xup-ΔP _xdown)/2gh _x ----------①

ρ in the formula _Mx_ _ _ _ _ _ _ _ the sampling loop fluid density, unit K g/m ³

Δ P _Xup_ _ _ _ _ _ _ _ sampling loop tedge pressure reduction, unit K g/m ³

Δ P _Fx_ _ _ _ _ _ _ _ pressure that friction force that fluid and tube wall form produces, the Pa of unit

Δ P _Xdown_ _ _ _ _ _ _ _ sampling loop downtake pressure reduction, unit K g/m ³

h _x_ _ _ _ _ _ _ _ the not good enough difference in height of taking a sample, the M of unit

The fluid heating rod (9) of flowing through is measured temperature difference T and heating power W then

$W=Q_P(\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}{\mathrm{HC}}_W+\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}(1-H)C_o)$

-------------②

1., 2. simultaneous is obtained water percentage H----------

Q in the formula _p_ _ _ _ _ _ _ _ the gear-type pump flow, the m of unit ³/ S

C _w_ _ _ _ _ _ _ _ water specific heat, the w/Kg of unit ℃

C _o_ _ _ _ _ _ _ _ oil ratio heat, the w/Kg of unit ℃.

The invention has the beneficial effects as follows: these structure dependency theory computing method, avoided the experience composition in the Calculation of Heat Transfer, thereby range ability and precision greatly improve, debug process is greatly simplified, the influence of having avoided viscosity to bring simultaneously, gas, liquor ratio measurement aspect has added a flow pattern reorganizer (or being called the part tripping device) before U type pipe, divide to fall most of gas to measure with vortex precession flowmeter, make fluid maintain low gas all the time through the inverted U pipe, the state of liquor ratio, the influence of having avoided flow pattern to bring, range ability and measuring accuracy have been enlarged, simplified debug process, two kinds of constructional devices of the present invention are suitable for different range, and this principle of work and measuring method do not have gamma-ray potential safety hazard, can measure viscous crude, not influenced by salinity.Have the measuring accuracy height, applied widely, measure reliable, stable characteristics.

Four, description of drawings

Fig. 1 is first kind of three-phase flow instrument of the present invention structure and work synoptic diagram, and Fig. 2 is second kind of three-phase flow instrument structure and work synoptic diagram.

Above-mentioned number in the figure explanation: 1. ball valve, 2. gear-type pump, 3. pressure difference transmitter, 4. temperature, the compound transmitter of the temperature difference, 5. compound transmitter thermometric loop, 6. temperature sensor, 7. oily flow switch, 8. sampling loop, 9. heating rod, 10. moisture sampling pipe, 11. " U " shape pipe, 12. moisture sampling analysis devices, 13. equipment importation, 14. flow pattern reorganizers, 15. pressure units, 16. precession vortex flow instrument, 17. temperature transmitters, 18. air pipes, 19. threeway, 20. gas-liquid resistance balance valves, 21. discharge opeings outlet, 22. Venturi tube, 23. static mixer, 24. fall " U " shape pipe, 25. water oil pipe lines, 26. filtrator, 27. sampler.

Five, embodiment

The present invention is further described below in conjunction with drawings and Examples, and in Fig. 1, slave unit import 13 is a complete three-phase flow instrument structure and work synoptic diagram to discharge opeing outlet 21.Equipment importation 13 was made two-way up and down in 14 minutes through the flow pattern reorganizer, and top one road air pipe 18, following a tunnel is a water oil pipe line 25.Wherein on top in one road air pipe, 18 strokes, float ball valve 1 is formed loops through pressure unit 15, precession vortex flow instrument 16, temperature transmitter 17, threeway 19, two gas-liquid resistance balance valves 20 in parallel, threeway 19 and discharge opeing outlets 21, this road mainly is by measuring pressure, flow and temperature, is converted into the gas flow under the status of criterion.Following one the tunnel is in water oil pipe line 25 strokes, and float ball valve 1 is formed the loop through fall " U " shape pipe 24, float ball valve 1, static mixer 23, Venturi tube 22 and the discharge opeing outlet 21 that have pressure difference transmitter 3; Simultaneously manage 24 decline pipeline sections and connect moisture sampling analysis device 12 minor loops falling " U " shape, in moisture sampling analysis device 12, moisture sampling pipe 10 imports are that import is through sampler 27, float ball valve 1, " U " shape pipe 11 that left and right sides pressure difference transmitter 3 is housed, gear-type pump 2, temperature, the compound transmitter 4 of the temperature difference, " U " shape pipe 24 that has left and right sides heating rod 9, temperature sensor 6, oily flow switch 7 and sampling loop 8 composition loops successively to the loop; " U " shape of falling that wherein has heating rod 9 is managed between the compound transmitter 4 of temperature, the temperature difference of 24 back segments and front and is formed compound transmitter thermometric loop 5, manages on 24 temperature sensor 6 is installed " U " shape of falling that has left and right sides heating rod 9.

In Fig. 2, contrast Fig. 1 is the same on the basic structure, and different is the front that moisture sampling analysis device 12 is placed on flow pattern reorganizer 14, many filtrators 26 between equipment importation 13 and moisture sampling analysis device 12 integral body, filtrator 26 can be adorned and can not adorn according to silt content; Trunk line connects flow pattern reorganizer 14 through ball valve 1 below the sampler 27.

The purposes of system of the present invention and measuring method: as shown in Figure 1, detected fluid through flow pattern collating unit 14, is told most of gas earlier, and the precession vortex flow instrument 16 through top a tunnel is measured.Below one road liquid and small part gas survey gas, liquor ratio through falling " U " shape pipe 24, mix through static mixer 23, survey total flow Q through Venturi tube 22 again, promptly $Q=C\sqrt{\frac{{\mathrm{\ΔP}}_2}{{\mathrm{\ρ}}_m}}$

In the formula: C: coefficient

Δ P ₂: Venturi tube pressure reduction, the Pa of unit

ρ _m: mixture density, unit K g/m ³

" U " shape of flowing through down at fluid pipe (24) is measured the pressure differential deltap P of this section during the ascent stage ₁, this pressure reduction is by forming with the lower part: Δ P ₁=ρ _mGh+ Δ P _f

In the formula: g: acceleration of gravity, the M/S of unit ²

H: difference in height between the 2 pressure points, the M of unit

Δ P _f: resistance to flow, the Pa of unit

Δ P wherein _fEstimate according to fluid mechanics principle, can obtain ρ _m=(Δ P ₁-Δ P _f)/gh

And while ρ _m=α Q ρ _g+ (1-α) QH ρ _W+ (1-α) Q (1-H) ρ _o

In the formula: α: void fraction

H: water percentage (can measure) by moisture measuring section

ρ _g: known gas density, unit K g/m ³

ρ _W: known water-mass density, unit K g/m ³

ρ _o: known oil density, unit K g/m ³

Q: by the total flow that Venturi tube is measured, the m of unit ³/ S

Thereby obtain α, thereby obtain gas flow Q _g, Q _g=α Q, whole total gas flow rate Q _{G is total}=α Q+Q _{The g table}

Q in the formula _{The g table}By precession vortex flow instrument (16) is surveyed tolerance, the m of unit ³/ S

When fluid is flowed through down " U " shape pipe (24) decline pipeline section, take out partially liq from fluid, this partially liq is extracted out by gear-type pump (2), measures the gas that contains minute quantity in this partially liq by containing water-sampling device (12):

ΔP _xup＝ρ _mxgh _x+ΔP _fx

ΔP _xdown＝ΔP _fx-ρ _mxgh _x

2P _xdowngh _x＝ΔP _fx-ΔP _xdown

ρ _mx＝(ΔP _xup-ΔP _xdown)/2gh _x ----------①

ρ in the formula _Mx_ _ _ _ _ _ _ _ the sampling loop fluid density, unit K g/m ³

Δ P _Xup_ _ _ _ _ _ _ _ sampling loop tedge pressure reduction, unit K g/m ³

Δ P _Fx_ _ _ _ _ _ _ _ pressure that friction force that fluid and tube wall form produces, the Pa of unit

Δ P _Xdown_ _ _ _ _ _ _ _ sampling loop downtake pressure reduction, unit K g/m ³

h _x_ _ _ _ _ _ _ _ the not good enough difference in height of taking a sample, the M of unit

The fluid heating rod (9) of flowing through is measured temperature difference T and heating power W then

$W=Q_P(\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}{\mathrm{HC}}_W+\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}(1-H)C_o)$

-------------②

1., 2. simultaneous is obtained water percentage H----------

Q in the formula _p_ _ _ _ _ _ _ _ the gear-type pump flow, the m of unit ³/ S

C _w_ _ _ _ _ _ _ _ water specific heat, the w/Kg of unit ℃

C _o_ _ _ _ _ _ _ _ oil ratio heat, the w/Kg of unit ℃

Measured total flow Q by Venturi tube (22), " U " shape pipe (24) that falls that has pressure difference transmitter (3) is measured void fraction α, and heating rod (9) is measured water percentage H, promptly respectively fuel-displaced, gas, discharge:

Q _g＝αQ

Q _w＝(1-α)QH

Q _o＝(1-α)Q(1-H)

Q _g_ _ _ _ _ _ _ _ airshed, the m of unit ³/ S

Q _w_ _ _ _ _ _ _ _ discharge, the m of unit ³/ S

Q _o_ _ _ _ _ _ _ _ oily flow, the m of unit ³/ S

In use, system shown in Figure 1 is owing to take a sample in flow pattern reorganizer 14 back, be applicable to the not high place of response speed that water percentage H is measured, the characteristics of field produces determine that its time yardstick is very long, generally less demanding to response speed, if to the demanding occasion of response speed, can adopt system shown in Figure 2, sampling is placed on the front of flow pattern reorganizer 14.

Claims (5)

1. crude oil-natural gas-water three-phase flow meter, comprise valve, " U " shape pipe, transmitter, moisture sampling analysis device (12), Venturi tube (22), static mixer (23), it is characterized in that: equipment importation (13) is divided into two-way up and down through flow pattern reorganizer (14); Above one the tunnel be air pipe (18), export to discharge opeing outlet (21) gas-liquid resistance balance valve (20) of assembling pressure transmitter (15), precession vortex flow instrument (16), temperature transmitter (17) and parallel connection successively from flow pattern reorganizer (14); Below one the tunnel be water oil pipe line (25), from flow pattern reorganizer (14) export to discharge opeing outlet (21) assemble successively have a pressure difference transmitter (3) fall " U " shape pipe (24), static mixer (23), Venturi tube (22), wherein contain water-sampling device (12) falling the connection of " U " shape pipe (24) decline pipeline section.

2. crude oil-natural gas-water three-phase flow meter according to claim 1, it is characterized in that: in containing water-sampling device (12), moisture sampling pipe (10) import to the loop is successively, import is through sampler (27), " U " shape pipe (11) of left and right sides pressure difference transmitter (3) is housed, gear-type pump (2), temperature, the compound transmitter of the temperature difference (4), " U " shape of falling that has left and right sides heating rod (9) is managed (24) and sampling loop (8) composition loop, wherein has " U " shape pipe (24) back segment of heating rod (9) and the temperature of front, form compound transmitter thermometric loop (5) between the compound transmitter of the temperature difference (4).

3. crude oil-natural gas-water three-phase flow meter according to claim 2 is characterized in that: be connected and installed with temperature sensor (6) on " U " shape pipe (24) top that has left and right sides heating rod (9) or moisture sampling pipe (10).

4. crude oil-natural gas-water three-phase flow meter according to claim 2 is characterized in that: connect ball valve (1) in moisture sampling pipe (10) inflow point, the last or last oily flow switch (7) that connects of moisture sampling pipe (10) at sampling loop (8).

5. the measuring method of crude oil-natural gas-water three-phase flow meter according to claim 1, it is characterized in that: detected fluid is handled to divide through flow pattern reorganizer (14) earlier and is made two-way, above one the tunnel be most of gas of telling, measure through precession vortex flow instrument (16); Below one the tunnel to be the liquid told and small part gas survey gas, liquor ratio through falling " U " shape pipe (24), mix through static mixer (23), survey total flow Q through Venturi tube again: $Q=C\sqrt{\frac{{\mathrm{\ΔP}}_2}{{\mathrm{\ρ}}_m}}$

In the formula: C: coefficient

Δ P ₂: Venturi tube pressure reduction, the Pa of unit

ρ _m: mixture density, unit K g/m ³

" U " shape of flowing through down at fluid pipe (24) is measured the pressure differential deltap P of this section during the ascent stage ₁, this pressure reduction is by forming with the lower part: Δ P ₁=ρ _mGh+ Δ P _f

In the formula: g: acceleration of gravity, the M/S of unit ²

H: difference in height between the 2 pressure points, the M of unit

Δ P _f: resistance to flow, the Pa of unit

Δ P wherein _fEstimate according to fluid mechanics principle, can obtain ρ _m=(Δ P ₁-Δ P _f)/gh

And while ρ _m=α Q ρ _g+ (1-α) Q H ρ _w+ (1-α) Q (1-H) ρ _o

In the formula: α: void fraction

H: the water percentage that can measure by moisture measuring section

ρ _g: known gas density, unit K g/m ³

ρ _w: known water-mass density, unit K g/m ³

ρ _o: known oil density, units/m ³

Q: by the total flow that Venturi tube is measured, the m of unit ³/ S

Thereby obtain α, thereby obtain gas flow Q _g, Q _g=α Q, whole total gas flow rate Q _{G is total}=α Q+Q _{The g table}

Q in the formula _{The g table}By precession vortex flow instrument (16) is surveyed tolerance, the m of unit ³/ S

When fluid is flowed through down " U " shape pipe (24) decline pipeline section, take out partially liq from fluid, this partially liq is extracted out by gear-type pump (2), measures the gas that contains minute quantity in this partially liq by containing water-sampling device (12):

ΔP _xup＝ρ _mxgh _x+ΔP _fx

ΔP _xdown＝ΔP _fx-ρ _mxgh _x

2P _xdowngh _x＝ΔP _fx-ΔP _xdown

ρ _mx＝(ΔP _xup-ΔP _xdown)/2gh _x ----------①

ρ in the formula _Mx_ _ _ _ _ the sampling loop fluid density, unit K g/m ³

Δ P _Xup_ _ _ _ _ sampling loop tedge pressure reduction, unit K g/m ³

Δ P _Fx_ _ _ _ _ pressure that friction force that fluid and tube wall form produces, the Pa of unit

Δ P _Xdown_ _ _ _ _ sampling loop downtake pressure reduction, unit K g/m ³

h _x_ _ _ _ _ the not good enough difference in height of taking a sample, the M of unit

The fluid heating rod (9) of flowing through is measured temperature difference T and heating power W then

$W=Q_P(\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}{\mathrm{HC}}_w+\frac{{\mathrm{\ρ}}_{\mathrm{mx}}}{{\mathrm{\ρ}}_{w}H+(1-H){\mathrm{\ρ}}_o}(1-H)C_o)$

-----------②

1., 2. simultaneous is obtained water percentage H-------

Q in the formula _p_ _ _ _ _ the gear-type pump flow, the m of unit ³/ S

C _w_ _ _ _ _ water specific heat, the w/Kg of unit ℃

C _o_ _ _ _ _ oil ratio heat, the w/Kg of unit ℃

Measured total flow Q by Venturi tube (22), " U " shape pipe (24) that falls that has pressure difference transmitter (3) is measured void fraction α, and heating rod (9) is measured water percentage H, promptly respectively fuel-displaced, gas, discharge:

Q _g＝αQ

Q _w＝(1-α)Q?H

Q _o＝(1-α)Q(1-H)

Q _g_ _ _ _ _ airshed, the m of unit ³/ S

Q _w_ _ _ _ _ discharge, the m of unit ³/ S

Q _o_ _ _ _ _ oily flow, the m of unit ³/ S.

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