CN105157766A - Two-differential-pressure moisture flow on-line measuring device and method - Google Patents

Abstract

The invention discloses a two-differential-pressure moisture flow on-line measuring device and method. The device comprises a Venturi flowmeter on the upstream part, a spindle flowmeter on the downstream part and a processor. The opposite ends of the Venturi flowmeter and the spindle flowmeter are connected through a flange. The Venturi flowmeter and the spindle flowmeter are connected with the processor. The processor is provided with a moisture two-phase flow measuring module, and gas-liquid two-phase flow is output on line according to input parameters. The Venturi flowmeter is arranged in front of the spindle flowmeter, and influences caused by the flowermeter on the front portion on a flow field and the flowmeter on the rear portion are reduced to the greatest degree. The spindle flowmeter is of a good streamline structure, is small in flow resistance, has the good flow stabilizing and interference resisting ability and is arranged on the downstream part of the Venturi flowmeter, and therefore the measuring performance of the combined flowmeter can be improved to the greatest degree.

Description

Two differential pressure flux of moisture on-line measurement device and method

Technical field

The present invention relates to a kind of flux of moisture on-Line Monitor Device, especially a kind of venturi and the two differential pressure flux of moisture on-line measurement device and method of spindle.

Background technology

The flowmeter existed in the market mostly is monophasic fluid measuring flow meter, and the flowmeter kind of moisture two phase flow on-line measurement is few and expensive.Differential pressure flowmeter stable performance and cost is lower, application is comparatively extensive.In differential pressure method traffic measurement model, flow is the function of line size, physical properties of fluids and flowmeter differential pressure etc.Two differential pressure flowmeter forms primarily of former and later two differential pressure flowmeters, and in two differential pressure flux of moisture on-line measurement model, two phase flow is the function of differential pressure etc. of line size, physical properties of fluids, two differential pressure flowmeters.In actual measurement process, known line size and physical properties of fluids, obtain stream pipeline pressure, two flowmeters differential pressure separately by on-line measurement, converse the two phase flow of moisture.Two differential pressure flux of moisture on-line measurement devices of current existence mainly adopt the combination of venturi and orifice flowmeter or the combination of venturi and V cone flow meter.Wherein the resistance to flow of orifice flowmeter is comparatively large, adds flow pressure drop, unfavorable to the moisture transport of pipeline.Simultaneously, in already present pair of differential pressure assembled flowmeter, venturi is put behind, and preposition orifice plate or V cone are to the disturbance in flow field, downstream comparatively greatly, are unfavorable for that the flowing field stability of mix flow gauge installation region keeps, and then have influence on the measurement performance of rearmounted Venturi meter.Therefore need, while the two differential pressure flowmeter measurement performance stability of maintenance, to reduce the Flows drag losses that double-current gauge causes as far as possible.

Summary of the invention

In order to solve the deficiencies in the prior art, the present invention proposes a kind of two differential pressure flux of moisture on-line measurement device, the present invention adopts following technical scheme:

Two differential pressure flux of moisture on-line measurement device, comprise the Venturi meter of upstream, the Spindle Flowmeter in downstream and processor, Flange joint is passed through in the opposite end of Venturi meter and Spindle Flowmeter, Venturi meter and Spindle Flowmeter connection handling device respectively;

The entry position of Venturi meter and throat position are respectively equipped with pressure acquisition point, and Venturi meter gathers former and later two pressure value P 1 and P2, and wherein, in Venturi meters, the pressure P 1 of entry position is the pressure of pipeline;

Upstream and the position of knocking into the back of Spindle Flowmeter are respectively arranged with pressure acquisition point, and Spindle Flowmeter gathers former and later two pressure value P 3 and P4;

The pressure value P 1 gathered, P2, P3 and P4 are delivered in processor, have moisture two-phase flowmeter model in processor, and the parameter according to input exports gas-liquid two-phase flow separately online.

Further, the other end of described Venturi meter is connected with tested pipeline by flange, the other end of Spindle Flowmeter is connected with tested pipeline by flange, and the moisture two-phase fluid in pipeline flows out and returns in pipeline through Venturi meter, Spindle Flowmeter.

Further, described processor is provided with the human-computer interaction interface for inputting fundamental physical quantity information.

According to the on-line monitoring method of above-mentioned pair of differential pressure flux of moisture on-line measurement device, adopt following steps:

(1) by human-computer interaction interface input channel internal diameter D, the Throttling ratio β of flowmeter, density of gas phase ρ _g, density of liquid phase ρ _l, connect data-interface, can demarcation be completed by device automatically measuring and acquiring information;

(2) the two phase flow coefficient C of each flowmeter is obtained _mwith X _lMrelational expression:

$C_m=\frac{m_g+m_l}{m_{tpc}}$ ①

Wherein, m _gfor gas phase mass flow, m _lfor liquid phase quality flow,

X _lMsize for liquid content:

$X_{LM}=\frac{m_l}{m_g}\sqrt{\frac{{\mathrm{\ρ}}_g}{{\mathrm{\ρ}}_l}}$ ②

C _mwith X _lMbecome linear approximate relationship:

C _m＝aX _LM+b③

Wherein, a, b are relevant with the flow of pressure and gas, obtain by carrying out demarcation to two single current gauge early stage;

(3) pressure value P 1 of collection, P2, P3 and P4 are delivered in processor by Venturi meter and Spindle Flowmeter respectively, and processor process obtains the differential pressure △ P of the gas liquid two-phase flow that Venturi meter and Spindle Flowmeter record respectively _tp, obtain moisture theoretical delivery m by the differential pressure of gas liquid two-phase flow _tpc:

$m_{tpc}=\frac{{\mathrm{\πD}}^2{\mathrm{\β}}^2\sqrt{2{\mathrm{\ρ}}_g{\mathrm{\ΔP}}_{tp}}}{4\×\sqrt{1-{\mathrm{\β}}^4}}$ ④；

(4) obtained by step (1), (2), (3):

$m_g=\frac{m_{tpc}({\mathrm{aX}}_{LM}+b)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑤

Gas phase mass flow m is tried to achieve by above formula _g, then by m _gtry to achieve m _l.

In described step (2), Venturi meter rower obtains a surely ₁, b ₁:

C _m＝a ₁X _LM+b ₁⑥；

Spindle Flowmeter is demarcated and is obtained a ₂, b ₂:

C _m＝a ₂X _LM+b ₂⑦。

In described step (3), Venturi meter gathers former and later two pressure value P 1 and P2, obtains the differential pressure △ P of Venturi meter _tp, be brought into the theoretical measuring flow m obtaining Venturi meter in 4. formula _tpc;

The pressure P 1 of venturi upstream is carried out the density of fluid as the pressure of pipeline, the 2. formula that is brought into obtains the X of moisture flow process _lM, Spindle Flowmeter gathers former and later two pressure value P 3 and P4, obtains the differential pressure △ P of Spindle Flowmeter _tp, be brought into the theoretical measuring flow m obtaining Spindle Flowmeter in 4. formula _tpc.

By X _lM, the m that obtains respectively of Venturi meter and Spindle Flowmeter _tpcbe updated in calibrated 8. formula, obtain the DIFFERENT WET airshed equation corresponding with two flowmeters:

$m_g=\frac{m_{tpc1}(a_1{X}_{LM}+b_1)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$

$m_g=\frac{m_{tpc2}(a_2{X}_{LM}+b_2)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑧

Simultaneous solution can obtain ducted gas-liquid two-phase flow m _gand m _l.

The Advantageous Effects adopting as above scheme to obtain is:

Before Venturi meter is arranged in Spindle Flowmeter, farthest reduce the impact of previous flow meter stream field and flowmeter survey below.

Spindle Flowmeter has good stream shape structure, and resistance to flow is little; And there is good current stabilization and antijamming capability, be arranged in Venturi meter downstream, farthest can improve the measurement performance of mix flow gauge.

Accompanying drawing explanation

Fig. 1 is two differential pressure flux of moisture on-line measurement device schematic diagram.

Embodiment

1 pair of the specific embodiment of the present invention is described further by reference to the accompanying drawings:

Two differential pressure flux of moisture on-line measurement device 2, comprise the Venturi meter 1 of upstream, the Spindle Flowmeter 3 in downstream and processor, Flange joint is passed through in the opposite end of Venturi meter and Spindle Flowmeter, Venturi meter and Spindle Flowmeter connection handling device respectively;

The entry position of Venturi meter and throat position are respectively equipped with pressure acquisition point, Venturi meter gathers former and later two pressure value P 1 and P2, and (P1 is Venturi meter upstream pressure, P2 is Venturi meter downstream pressure), wherein, the pressure that in Venturi meters, the pressure P 1 (i.e. Venturi meter upstream pressure) of entry position is pipeline;

Upstream and the position of knocking into the back of Spindle Flowmeter are respectively arranged with pressure acquisition point, and Spindle Flowmeter gathers former and later two pressure value P 3 and P4 (P3 is Spindle Flowmeter upstream pressure, and P4 is Spindle Flowmeter downstream pressure);

The pressure value P 1 gathered, P2, P3 and P4 are delivered in processor, have moisture two-phase flowmeter model in processor, and the parameter according to input exports gas-liquid two-phase flow separately online.

The other end of Venturi meter is connected with tested pipeline by flange, and the other end of Spindle Flowmeter is connected with tested pipeline by flange, and the moisture two-phase fluid in pipeline flows out and returns in pipeline through Venturi meter, Spindle Flowmeter.

The flange that the flange of Venturi meter and the opposite end of Spindle Flowmeter, Venturi meter are connected with tested pipeline and the flange that Spindle Flowmeter is connected with tested pipeline are referred to as joint flange 4.

Processor is provided with the human-computer interaction interface for inputting fundamental physical quantity information.

Adopt venturi in front, the posterior array mode of Spindle Flowmeter, the disturbance of venturi stream field is less, thus the impact reduced flowmeter survey performance below, and Spindle Flowmeter has good stream shape structure, comparatively orifice plate and V cone have better current stabilization and Ability of Resisting Disturbance, and resistance to flow is less.Therefore Spindle Flowmeter be placed on venturi after combination, there is good measurement performance.

According to the on-line monitoring method of above-mentioned pair of differential pressure flux of moisture on-line measurement device, adopt following steps:

(1) by human-computer interaction interface input channel internal diameter D, the Throttling ratio β of flowmeter, density of gas phase ρ _g, density of liquid phase ρ _l, connect data-interface, can demarcation be completed by device automatically measuring and acquiring information;

(2) the two phase flow coefficient C of each flowmeter is obtained _mwith X _lMrelational expression:

$C_m=\frac{m_g+m_l}{m_{tpc}}$ ①

Wherein, m _gfor gas phase mass flow, m _lfor liquid phase quality flow,

X _lMsize for liquid content:

$X_{LM}=\frac{m_l}{m_g}\sqrt{\frac{{\mathrm{\ρ}}_g}{{\mathrm{\ρ}}_l}}$ ②

C _mwith X _lMbecome linear approximate relationship:

C _m＝aX _LM+b③

Wherein, a, b are relevant with the flow of pressure and gas, obtain by carrying out demarcation to two single current gauge early stage;

(3) pressure value P 1 of collection, P2, P3 and P4 are delivered in processor by Venturi meter and Spindle Flowmeter respectively, and processor process obtains the differential pressure △ P of the gas liquid two-phase flow that Venturi meter and Spindle Flowmeter record respectively _tp, obtain moisture theoretical delivery m by the differential pressure of gas liquid two-phase flow _tpc:

$m_{tpc}=\frac{{\mathrm{\πD}}^2{\mathrm{\β}}^2\sqrt{2{\mathrm{\ρ}}_g{\mathrm{\ΔP}}_{tp}}}{4\×\sqrt{1-{\mathrm{\β}}^4}}$ ④；

(4) obtained by step (1), (2), (3):

$m_g=\frac{m_{tpc}({\mathrm{aX}}_{LM}+b)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑤

Gas phase mass flow m is tried to achieve by above formula _g, then by m _gtry to achieve m _l.

In described step (2), Venturi meter rower obtains a surely ₁, b ₁:

C _m＝a ₁X _LM+b ₁⑥；

Spindle Flowmeter is demarcated and is obtained a ₂, b ₂:

C _m＝a ₂X _LM+b ₂⑦。

In described step (3), Venturi meter gathers former and later two pressure value P 1 and P2, obtains the differential pressure △ P of Venturi meter _tp, be brought into the theoretical measuring flow m obtaining Venturi meter in 4. formula _tpc;

The pressure P 1 of venturi upstream is carried out the density of fluid as the pressure of pipeline, the 2. formula that is brought into obtains the X of moisture flow process _lM, Spindle Flowmeter gathers former and later two pressure value P 3 and P4, obtains the differential pressure △ P of Spindle Flowmeter _tp, be brought into the theoretical measuring flow m obtaining Spindle Flowmeter in 4. formula _tpc.

By X _lM, the m that obtains respectively of Venturi meter and Spindle Flowmeter _tpcbe updated in calibrated 8. formula, obtain the DIFFERENT WET airshed equation corresponding with two flowmeters:

$m_g=\frac{m_{tpc1}(a_1{X}_{LM}+b_1)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$

$m_g=\frac{m_{tpc2}(a_2{X}_{LM}+b_2)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑧

Simultaneous solution can obtain ducted gas-liquid two-phase flow m _gand m _l.

Concrete conversion process all can be input in processor, has automatically been calculated by processor.In the flow meter calibration process of reality, by information such as simple man-machine interface operation input channel size, flowmeter structure size and physical properties of fluids, connect data-interface, can demarcation be completed by device automatically measuring and acquiring information.In flux of moisture on-line measurement process, the direct automatically measuring and acquiring of device two differential pressure information, converting to solve by internal processor obtains gas-liquid two-phase flow separately.

Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this instructions; made all equivalently to substitute, obvious form of distortion, within the essential scope all dropping on this instructions, protection of the present invention ought to be subject to.

Claims (7)

1. pair differential pressure flux of moisture on-line measurement device, it is characterized in that, comprise the Venturi meter of upstream, the Spindle Flowmeter in downstream and processor, Flange joint is passed through in the opposite end of Venturi meter and Spindle Flowmeter, Venturi meter and Spindle Flowmeter connection handling device respectively;

The entry position of Venturi meter and throat position are respectively equipped with pressure acquisition point, and Venturi meter gathers former and later two pressure value P 1 and P2, and wherein, in Venturi meters, the pressure P 1 of entry position is the pressure of pipeline;

Upstream and the position of knocking into the back of Spindle Flowmeter are respectively arranged with pressure acquisition point, and Spindle Flowmeter gathers former and later two pressure value P 3 and P4;

The pressure value P 1 gathered, P2, P3 and P4 are delivered in processor, have moisture two-phase flowmeter model in processor, and the parameter according to input exports gas-liquid two-phase flow separately online.

2. according to claim 1 pair of differential pressure flux of moisture on-line measurement device, it is characterized in that, the other end of described Venturi meter is connected with tested pipeline by flange, the other end of Spindle Flowmeter is connected with tested pipeline by flange, and the moisture two-phase fluid in pipeline flows out and returns in pipeline through Venturi meter, Spindle Flowmeter.

3. according to claim 2 pair of differential pressure flux of moisture on-line measurement device, it is characterized in that, described processor is provided with the human-computer interaction interface for inputting fundamental physical quantity information.

4. the on-line monitoring method of according to claim 3 pair of differential pressure flux of moisture on-line measurement device, is characterized in that, described line monitoring method adopts following steps:

(1) by human-computer interaction interface input channel internal diameter D, the Throttling ratio β of flowmeter, density of gas phase ρ _g, density of liquid phase ρ _l, connect data-interface, can demarcation be completed by device automatically measuring and acquiring information;

(2) the two phase flow coefficient C of each flowmeter is obtained _mwith X _lMrelational expression:

$C_m=\frac{m_g+m_l}{m_{tpc}}$ ①

Wherein, m _gfor gas phase mass flow, m _lfor liquid phase quality flow,

X _lMsize for liquid content:

$X_{LM}=\frac{m_l}{m_g}\sqrt{\frac{{\mathrm{\ρ}}_g}{{\mathrm{\ρ}}_l}}$ ②

C _mwith X _lMbecome linear approximate relationship:

C _m＝aX _LM+b③

Wherein, a, b are relevant with the flow of pressure and gas, obtain by carrying out demarcation to two single current gauge early stage;

(3) pressure value P 1 of collection, P2, P3 and P4 are delivered in processor by Venturi meter and Spindle Flowmeter respectively, and processor process obtains the differential pressure △ P of the gas liquid two-phase flow that Venturi meter and Spindle Flowmeter record respectively _tp, obtain moisture theoretical delivery m by the differential pressure of gas liquid two-phase flow _tpc:

$m_{tpc}=\frac{{\mathrm{\πD}}^2{\mathrm{\β}}^2\sqrt{2{\mathrm{\ρ}}_g{\mathrm{\ΔP}}_{tp}}}{4\×\sqrt{1-{\mathrm{\β}}^4}}$ ④；

(4) obtained by step (1), (2), (3):

$m_g=\frac{m_{tpc}({\mathrm{aX}}_{LM}+b)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑤

Gas phase mass flow m is tried to achieve by above formula _g, then by m _gtry to achieve m _l.

5. on-line monitoring method according to claim 4, is characterized in that, in described step (2), Venturi meter rower obtains a surely ₁, b ₁:

C _m＝a ₁X _LM+b ₁⑥；

Spindle Flowmeter is demarcated and is obtained a ₂, b ₂:

C _m＝a ₂X _LM+b ₂⑦。

6. on-line monitoring method according to claim 5, is characterized in that, in described step (3), Venturi meter gathers former and later two pressure value P 1 and P2, obtains the differential pressure △ P of Venturi meter _tp, be brought into the theoretical measuring flow m obtaining Venturi meter in 4. formula _tpc;

The pressure P 1 of venturi upstream is carried out the density of fluid as the pressure of pipeline, the 2. formula that is brought into obtains the X of moisture flow process _lM, Spindle Flowmeter gathers former and later two pressure value P 3 and P4, obtains the differential pressure △ P of Spindle Flowmeter _tp, be brought into the theoretical measuring flow m obtaining Spindle Flowmeter in 4. formula _tpc.

7. on-line monitoring method according to claim 6, is characterized in that, by X _lM, the m that obtains respectively of Venturi meter and Spindle Flowmeter _tpcbe updated in calibrated 8. formula, obtain the DIFFERENT WET airshed equation corresponding with two flowmeters:

$m_g=\frac{m_{tpc1}(a_1{X}_{LM}+b_1)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$

$m_g=\frac{m_{tpc2}(a_2{X}_{LM}+b_2)}{1+X_{LM}/\sqrt{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_l}}$ ⑧

Simultaneous solution can obtain ducted gas-liquid two-phase flow m _gand m _l.