CN85201644U - Single orifice-plate biphase flowmeter - Google Patents

Abstract

Two measuring elements must be adopted in order to measure the total flow and each flow of the biphase flow simultaneously. In addition, the tube inherence to be measured is utilized as the other measuring element, so the actual measuring element is decreased one half accordingly. The utility model has simple structure and reliable operation; the utility model can be used for the measurement of the flow of the double-parameter flow of gas-solid, gas-liquid and liquid-solid.

Description

Single orifice-plate biphase flowmeter

The utility model belongs to the two phase fluid flow measurement instrument

The two-phase flow flow measurement that is run in the industry such as power, chemical industry, oil, cement, food is measured as the gas-liquid two-phase flow, and the gas-solid two-phase flow is measured and liquid-solid two-phase flow is measured, and is the problem that people attempt to solve always.In the past in the two-phase flow flow measurement, measure simultaneously total flow with each mutually shunt volume must use two measuring sensors.For example, use the spectacle plate method, double-venturi pipe method, turbolator and orifice plate combined method.Oval gear flowmeter and orifice plate combination etc.Using two measuring sensors not only increases manufacturing expense, maintenance load and secondary instrument, and when experiment is installed and used, also be subjected to more restriction.Each measuring sensor has the restriction of its application conditions again, can only be used for the high liquids and gases two phase fluid of viscosity as gear meter.Spectacle plate method and double-venturi pipe method can not be with being used for the flow measurement of gas-liquid two-phase, and gear meter and orifice plate companion method can not be used for Dual-Phrase Distribution of Gas olid amount and the low liquids and gases two phase fluid of viscosity.In addition,, two measuring sensors significantly increase because can making resistance to flow and measure length of straight pipe, thereby the usable range of restriction instrument.The utility model is a kind of single orifice plate two-phase flowmeter that can measure the two-phase flow flow with a measuring sensor that proposes at above problem.

Fig. 1 takes into account the measuring method synoptic diagram for single orifice plate two-phase flow.(1) is orifice plate among the figure; (2) be orifice flange; (3) be tested tube; (4) be the flange measured hole; (5) be measured hole on the tested tube; (6) be microcomputer.

Fig. 2 is the AND DEWATERING FOR ORIFICE STRUCTURE synoptic diagram.(7) are the sharp edge circular hole slab among the figure; (8) be the circular hole template; (9) lack template for circle; (10) be the crescent moon template; (11) be the camber plate.

Main points of the present utility model be with an orifice plate as a measuring sensor, orifice plate is clipped in the centres of orifice flange of two band measured holes.In addition, utilize the tested tube itself that is connected with orifice flange, tested pipeline etc. for example, as another measuring sensor, and respectively opening a measured hole from the distant place of the tested tube in orifice plate front and back, promptly respectively open a measured hole on tested pipeline, the size in hole is decided according to selected differential pressure gauge.Orifice plate has sharp edge circular hole template according to different purposes.The circular hole template, circle lacks template, types such as crescent moon template and camber plate.

Orifice plate, as sharp edge circular hole template, the circular hole template, the camber plate, crescent moon template and the scarce template of circle etc. is made with materials such as copper or stainless steels usually.In order to make orifice plate wear-resisting, corrosion-resistant, usually at orifice plate, as sharp edge circular hole template, the circular hole template, the camber plate, crescent moon template and circle lack the hole wall of template and on the transversal section of incoming flow the wear-resisting or anti-corrosion rotten material of one deck are arranged; Or whole orifice plate by wear-resisting, resistant material is made.Normally used wear-resisting, resistant material is Stone, pottery or glass etc.The thickness of wear-resisting, etch resistant material layer according to different purposes, can be equivalent to 1/3～1/2 of metal perforated plate (promptly making with copper or stainless steel material) thickness.This layer is wear-resisting, resistant material can be used the powder shape

Stone, pottery or glass etc. suppress forming with metal perforated plate in forming mould.Also available epoxy is bonded on the metal perforated plate in type wear-resisting, corrosion-resistant.Concrete measuring process is: respectively open a measured hole on two orifice flanges before and after the orifice plate, these two holes connect differential pressure gauge, measure the pressure reduction △ P between two holes ₁On at a distance tested pipeline before and after the orifice plate, respectively opening a measured hole, measuring pressure reduction △ P between this two hole with differential pressure gauge ₂Because △ P ₁With light phase flow rate square be directly proportional △ P ₂/ △ P ₁With two phase flow ratio certain linear functional relation is arranged.Thereby according to the △ P that records ₁With △ P ₂Value and the known interior working pressure of pipeline can draw two-phase flow and each phase flow rate value in the pipe.Each measured value can be handled and automatic record with microcomputer.

The utility model has only a measuring sensor, and is simple in structure, and no-rotary part, reliable can be used for wear-resisting, corrosion-resistant fluid measurement, also can be used for the fluid that pollutes.The required measurement straight section of tested pipeline also can shorten half in addition, and You Yi adopts on the short commercial unit of measurement straight section.Measuring error is less than 5%.

Embodiment 1

The flow of air and soot particle potpourri in the application circular hole template measurement pipe.100 millimeters of pipe interior diameters.The ratio of orifice plate and hole and pipe interior diameter is 0.8, and orifice plate is made with not saturating steel.

According to following relationship formula (1) and relational expression (2), recording △ P ₁, △ P ₂With can be regarded as out MAF G after the working pressure _G, soot particle mass rate G _P, both sums are the mixture quality flow.

(▲P ₂)/(▲P ₁) ＝0.49＋0.375 (G _P)/(G _G) （1）

$\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="85201644\_DRIMG1.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\frac{{G_G}^2}{{2a}^2\left(\frac{d}{D}\right)2\mathrm{\&rho;}{\mathrm{GA}}^2}---\left(2\right)$

α in the formula---orifice flow constant equals 0.84;

ρ _G---atmospheric density, calculate kilogram/rice according to working pressure and temperature ³

A---pipe sectional area, rice ²

According to equation (1) and (2), just can obtain MAF G _GWith soot particle mass rate G _P

Embodiment 2

Pressure is the flow of 80 atmospheric steam water interfaces in the application circular hole template measurement pipe.The pipe interior diameter is 32 millimeters.The ratio of the hole of orifice plate and pipe interior diameter is 0.5, and orifice plate is made with stainless steel.

Recording △ P according to following relationship formula (3) and (4) ₁And △ P ₂After can calculate steam mass flow G _VAnd the mass rate G of water _L, both sums are the mass rate of steam water interface.

(▲P ₁)/(▲P ₂) ＝1.21＋0.17 (G _V)/(G _V+G _l) （3）

$\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="85201644\_DRIMG1.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\frac{{G_G}^2}{{2a}^2{\left(\frac{d}{D}\right)}^2\mathrm{\&rho;}{\mathrm{VA}}^2}---\left(4\right)$

α in the formula---orifice flow constant equals 0.703.

ρ V---vapour density is 80 atmospheric pressure according to pressure, is checked in kilogram/rice by saturation steam table ³

A---pipe sectional area, rice ²

According to equation (3) and (4), just can obtain the mass rate G of steam mass flow GV and water _L

Claims (5)

1, a kind of veneer two-phase flowmeter is characterized in that by an orifice plate (1), and orifice flange (2) and tested tube (3) constitute.Orifice plate places in the middle of two orifice flanges, respectively opens a measured hole (4) on each orifice flange, and orifice flange is connected with tested tube.

2, according to the described single orifice plate two-phase of claim 1 flowmeter, it is characterized in that described orifice plate is a sharp edge circular hole template (7), circular hole template (8), circle lacks template (9), crescent moon template (10), and camber plate (11).Sharp edge circular hole template, the circular hole template, circle lacks template, crescent moon template and camber plate, all available copper or stainless steel material are made.

3, according to the described single orifice plate two-phase of claim 1 flowmeter, it is characterized in that described tested tube is a tested pipeline, on the tested pipeline before and after the orifice flange, respectively have a measured hole.

4, according to claim 1,2 described single orifice plate two-phase flowmeters, it is characterized in that described orifice plate, sharp edge circular hole template, circular hole template, circle lacks template, crescent moon template, and the hole wall of camber plate reaches has the wear-resisting or resistant material of one deck on the transversal section of incoming flow; Or whole orifice plate is made by wear-resisting, resistant material.

5,, it is characterized in that described wear-resisting, resistant material is according to the described single hole two-phase of claim 4 flowmeter Stone, pottery or glass.

Images