CN203837757U - Device for measuring flow rate of high-temperature and high-pressure wet steam - Google Patents

Abstract

The utility model provides a device for measuring the flow rate of high-temperature and high-pressure wet steam. With the adoption of the device, the flow rate of fluid as well as the flow rates of gas phase and liquid phase can be obtained without the need of conducting gas-liquid two-phase separation on wet steam in advance; the fluid is subjected to pressure drop when passing through flowmeters of two V-type cones which are different in diameter, and the mass flow rates of the fluid passing through the V-type cones can be figured out by utilizing learned fluid knowledge. A basic equation is derived according to the mass conservation principle, and the dryness of the wet steam can be obtained by utilizing the equation. The flow rate of the wet steam is figured out through the dryness and the liquid-phase flow rate measured by an ultrasonic Doppler flowmeter. The gas-phase flow rate under non-standard conditions can be converted into a gas-phase flow rate under standard conditions by a pressure sensor and a temperature sensor. Obtained data is connected with an ADAM data acquisition module and finally is output.

Description

A kind of device of measuring High Temperature High Pressure wet steam flow

Technical field

This patent is a kind of device of measuring High Temperature High Pressure wet steam flow using in oil field, specifically by calculating dryness of wet steam and fluid flow, thereby calculates the each flow of stream mutually of gas-liquid.

Background technology

Wet steam is a kind of specific form of biphase gas and liquid flow, in the industry such as energy source and power, chemical industry, metallurgy, extensively exists.If only have monophasic fluid to flow through, its flowing law is basic identical, easily sets up a general mathematical model according to its characteristic, but in the time of two-phase or multiphase fluid mixed flow, huge variation may occur for its physical property and chemical change.Fluid density, viscosity etc., therefore, in the time that gas-liquid exists simultaneously, theory and the math equation of those independent gases or liquid flow all can not be suitable for again.But make rapid progress along with technical, wet steam is omnipresent especially, and spationautics and nuclear reactor etc. are more obvious.This also just forces broad research and the experiment of scientists to moisture, however current measuring method relatively complexity and cost higher.

At present, the measuring method of gas-liquid flow is roughly classified as two classes, the one, gas-liquid is separated in advance, then metering respectively, it is accurately simple that this method seems, but carefully analyze, gas-liquid flows simultaneously, whether isolation technics is difficulty not only, and after being separated, mix again and can be consistent with the character that separates front fluid, and the cost spending in isolation technics is also considerable.Therefore there is certain unrealistic property.The 2nd, also there are many methods of not carrying out gas-liquid separation and directly measure as herein at present, but these technology are often used gamma ray, microwave, electric capacity etc., this method precision is relatively high, but the fluidised form sensitivity of these original papers to two-phase flow, result of calculation is difficult for stable, and expensive, installation and maintenance quite bother.

According to above explanation, the invention provides a kind of structure relatively simple, the device of the feasible hygrometric steam flow of method.

Utility model content

The object of this patent is the flow in order to measure wet steam flow and the each phase of gas-liquid.Do not need gas-liquid separation in advance, can measure respectively wet-steam phase by each element, finally calculate the each phase flow rate of wet steam flow and gas-liquid.This installation cost is lower, and maintenance and installation are simple, and precision is higher.

The equipment adopting in device has two not identical V of diameter bore (1) and be connected with ADAM data acquisition module block assembly, be arranged on respectively the flowmeter (2) at two V cone places and be connected with ADAM data acquisition module block assembly, ultrasonic Doppler flowmeter (3) is also connected with ADAM data acquisition module block assembly, be arranged on the pressure difference transmitter (4) at two cone places and be connected with ADAM data acquisition module block assembly, a pressure transducer (5) is also connected with ADAM data acquisition module block assembly, a temperature sensor (6) is also connected with ADAM data acquisition module block assembly, ADAM data acquisition module (7) is also connected with output data set, output data set (8).

In pipeline before separation gas gas-liquid two-phase liquid, checkout equipment is housed, calculates the mass dryness fraction of wet steam by checkout equipment, finally obtain wet steam flow and the each flow of stream mutually of gas-liquid.At the different V cone place of diameter, two flowmeters are installed, the pressure drop Δ P that differential pressure pickup demonstrates wet steam after boring by V.

Ultrasonic Doppler flowmeter is arranged between two V cones, thereby obtains the flow of wet steam liquid phase stream between two cones.

A pressure transducer and a temperature sensor are arranged on fluid line, thereby are convenient to calculate the gas flow under standard state.

Whole device is connected with an ADAM data acquisition module, thus output data.

The physical quantity of measuring has the diameter of two circular cones to be respectively d ₁and d ₂, caused pressure drop Δ P during through two cones ₁, Δ P ₂.Ultrasonic Doppler detects the liquid phase flow Q between two cones _l, and the interior diameter D of pipeline, thus can release following formula and draw the mass dryness fraction x of wet steam according to knowledge

The flow that can be obtained wet steam by mass dryness fraction x is the flow Q of Q and gas phase _g.

The present invention's equation formula used is to flow continuously and the principle of mass conservation according to fluid, and then lists Bernoulli equation and knowledge according to local pipeline, derives a simple function relational expression, thereby reaches a solution of a problem.

Beneficial effect

Compared with numerous devices, the present invention has obvious feature.Flow process is simple, and equipment is few, and easily processing and manufacturing, flexible adjustment, reliable operation, maintenance and easy for installation.Therefore reached and had the advantages that cost poor benefit is high, there is certain actuality and objectivity.

Brief description of the drawings

Fig. 1 is a kind of device schematic diagram of measuring High Temperature High Pressure wet steam flow.

Embodiment

Illustrate the present invention and specifically measure the device of wet steam flow below according to diagram.

The equipment adopting in device has two not identical V of diameter bore (1) and be connected with ADAM data acquisition module block assembly, be arranged on respectively the flowmeter (2) at two V cone places and be connected with ADAM data acquisition module block assembly, ultrasonic Doppler flowmeter (3) is also connected with ADAM data acquisition module block assembly, be arranged on the pressure difference transmitter (4) at two cone places and be connected with ADAM data acquisition module block assembly, a pressure transducer (5) is also connected with ADAM data acquisition module block assembly, a temperature sensor (6) is also connected with ADAM data acquisition module block assembly, ADAM data acquisition module (7) is also connected with output data set, output data set (8).

In pipeline before separation gas gas-liquid two-phase liquid, checkout equipment is housed, calculates the mass dryness fraction of wet steam by checkout equipment, finally obtain wet steam flow and the each flow of stream mutually of gas-liquid.At the different V cone place of diameter, two flowmeters are installed, the pressure drop Δ P that differential pressure pickup demonstrates wet steam after boring by V.

Ultrasonic Doppler flowmeter is arranged between two V cones, thereby obtains the flow of wet steam liquid phase stream between two cones.

A pressure transducer and a temperature sensor are arranged on fluid line, thereby are convenient to calculate the gas flow under standard state.

Whole device is connected with an ADAM data acquisition module, thus output data.

The physical quantity of measuring has the diameter of two circular cones to be respectively d ₁and d ₂, caused pressure drop Δ P during through two cones ₁, Δ P ₂.Ultrasonic Doppler detects the liquid phase flow Q between two cones _l, and the interior diameter D of pipeline, thus can release following formula and draw the mass dryness fraction x of wet steam according to knowledge

The flow that can be obtained wet steam by mass dryness fraction x is the flow Q of Q and gas phase _g.

Wet steam is along direction as shown flowing into pipeline, when the diameter of flowing through is d ₁large V cone flow meter time, because drag effect can produce a pressure drop Δ p ₁, send out through pressure transmitter, before fluid flows to large circular cone and while flowing to conic section, use continuity equation and Bernoulli equation,

Just the mass rate can obtain flowing through large circular cone according to two equations time is:

$Q_{m1}=\frac{n_1{n}_{d1}{d}_1^2}{\sqrt{1-{(d_1/D)}^4}}\sqrt{{\mathrm{\ρ}}_{1}d{p}_1}$

Wherein dp ₁=p ₀-p ₁, n _d1represent the coefficient of flow of large circular cone.

Mass rate in like manner can flow through conicle time is:

$Q_{m2}=\frac{n_2{n}_{d2}{d}_2^2}{\sqrt{1-{(d_2/D)}^4}}\sqrt{{\mathrm{\ρ}}_{2}d{p}_2}$

The implication of each letter representation and the physical significance physical significance when flowing through large circular cone is identical.

Order $y_1=\frac{d_1^4}{1-{(d_1/D)}^4},y_2=\frac{d_2^4}{1-{(d_2/D)}^4}$

Simultaneous law of conservation of mass and above various obtaining

Wherein q ₁, q ₂volumetric flow rate while representing to flow through circular cone.

Use q _w1, q _w2, q _g1, q _g2vapour-liquid volumetric flow rate while representing to flow through large circular cone and conicle respectively,

Tool analysis can obtain, linear to volumetric flow rate through large circular cone from fluid.

Make bq _w1=q _w2, aq _g1=q _g2

Substitution (1) formula obtains $H=\frac{q_2}{q_1}=\frac{{\mathrm{bq}}_{w1}+{\mathrm{aq}}_{g1}}{q_{w1}+q_{g1}}---\left(2\right)$

Obviously, a, H value when b represents respectively that pure gas and pure liquid flow.

By q _w1=xq ₁, q _w2=(1-x) q ₁substitution (2) Shi Ke get:

G＝xa-xb+b (3)

Now, (3) formula is that we are required, finally can obtain mass dryness fraction x by known parameters.

Measure the liquid phase flow Q between two circular cones by ultrasonic Doppler flowmeter _l, can obtain gas flow and wet steam flow and be:

Q _g＝xQ， $Q=\frac{Q_l}{1-x}$

Can measure temperature at that time by pressure transmitter and temperature transmitter for this reason, the gas flow under nonstandard condition can be converted to thus to the volumetric flow rate of gas under standard state.A series of devices and ADAM data acquisition module couple together, and output can obtain each physical quantity.

Claims (5)

1. measure the device of High Temperature High Pressure wet steam flow for one kind: the equipment adopting in device has two V cones (1) that diameter is not identical, be arranged on respectively the flowmeter (2) at two V cone places and be connected with ADAM data acquisition module block assembly, Ultrasonic Doppler Flowmeter (3) is also connected with ADAM data acquisition module block assembly, be arranged on the pressure difference transmitter (4) at two cone places and be connected with ADAM data acquisition module block assembly, a pressure transducer (5) is also connected with ADAM data acquisition module block assembly, a temperature sensor (6) is also connected with ADAM data acquisition module block assembly, ADAM data acquisition module (7) is also connected with output data set, output data set (8).

2. a kind of device of measuring High Temperature High Pressure wet steam flow as claimed in claim 1, is characterized in that, at the different V cone place of diameter, two flowmeters is installed, the pressure drop Δ P that differential pressure pickup demonstrates wet steam after boring by V.

3. a kind of device of measuring High Temperature High Pressure wet steam flow as claimed in claim 1, is characterized in that, ultrasonic Doppler flowmeter is arranged between two V cones, thereby obtains the flow of wet steam liquid phase stream between two cones.

4. a kind of device of measuring High Temperature High Pressure wet steam flow as claimed in claim 1, is characterized in that, a pressure transducer and a temperature sensor are arranged on fluid line, thereby is convenient to calculate the gas flow under standard state.

5. a kind of device of measuring High Temperature High Pressure wet steam flow as claimed in claim 1, is characterized in that, whole device is connected with an ADAM data acquisition module, thus output data.