PL143998B1 - Apparatus for measuring flow rate of components of two-phase mixture of fluids having different densities - Google Patents

Apparatus for measuring flow rate of components of two-phase mixture of fluids having different densities Download PDF

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Publication number
PL143998B1
PL143998B1 PL24701284A PL24701284A PL143998B1 PL 143998 B1 PL143998 B1 PL 143998B1 PL 24701284 A PL24701284 A PL 24701284A PL 24701284 A PL24701284 A PL 24701284A PL 143998 B1 PL143998 B1 PL 143998B1
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PL
Poland
Prior art keywords
phase
pipeline
section
measuring
flow rate
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PL24701284A
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Polish (pl)
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PL247012A1 (en
Inventor
Mateusz Turkowski
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Politechnika Warszawska
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Priority to PL24701284A priority Critical patent/PL143998B1/en
Publication of PL247012A1 publication Critical patent/PL247012A1/en
Publication of PL143998B1 publication Critical patent/PL143998B1/en

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Description

Przedmiotem wynalazku jest urzadzenie do pomiaru natezenia przeplywu skladników dwufazo¬ wej mieszaniny plynów o róznych gestosciach* Znane jest urzadzenie do pomiaru natezenia przeplywu skladników dwufazowej mieszaniny plynów skladajace sie z urzadzenia rozdzielajacego obie fazy. Sa nim zazwyczaj duze i kosz¬ towne cyklony, gdzie rozdzielanie faz odbywa sie pod wplywem sil odsrodkowych i grawitacji* Po rozdzieleniu faz poszczególne skladniki sa mierzone za pomoca przeplywomierzy. W przy¬ padku, gdy nalezy mierzyc jedynie faze ciekla,, mozna zastosowac danaide rodzaj przeplywo¬ mierza zmiennego poziomu, zlozona ze zbiornika i zwezki wyplywowej. Faze gazowa wypuszcza sie do atmosfery.Znane rozwiazania sa skomplikowane technologicznie i kosztowne . Wedlug wynalazku urza¬ dzenie pomiarowe ma odcinek rurociagu, którego wlot jest na poziomie wyzszym niz wylot.Górna czesc tego odcinka rurociagu, stanowiaca separator faz, ma odprowadzenie w góre do toru pomiarowego fazy o mniejszej gestosci, zas dolna jego czesc stanowi tor pomiarowy fazy o wiekszej gestosci. W przynajmniej jednym torze pomiarowym zamontowany jest przeplywomierz.Z dolnym koncem toru pomiarowego fazy o wiekszej gestosci polaczony jest odcinek rurociagu o ogólnym kierunku w góre.Urzadzenie wedlug wynalazku realizuje pomiar za pomoca wyjatkowo skromnych srodków tech¬ nicznych wykonanych z typowych, masowo produkowanych elementów armatury. Do pomiaru mozna stosowac dowolne, tradycyjne rozwiazania przeplywomierzy.Przedmiot wynalazku jest uwidoczniony w przykladzie wykonania na rysunku przedstawiaja¬ cym schematycznie urzadzenie do pomiaru natezenia przeplywu dwufazowej mieszaniny cieczy i gazu.Urzadzenie to ma odcinek rurociagu AC, nachylony pod odpowiednim katem do poziomu. Zacho¬ dzi w nim rozwarstwienie mieszaniny zlozonej z cieczy i gazu pod wplywem sil grawitacyjnych.2 143 993 Ten odcinek AC atemowi separator faz 1. Znajdujacy sie od góry rurociagu gaz przechodzi do toru pomiarowego gazu 3 przez odprowadzenie B w odcinku rurociagu AC* W rurociagu, ponizej górnego odcinka AC, znajduje sie ciezsza ciecz, opadajaca az do punktu fi i F, najnizszych w urzadzeniu* Odcinek rurociagu ponizej punktu C, w którym splywajaca ciecz zajmuje juz caly przekrój rurociagu, stanowi tor cieczy 2* Polozenie tego punktu nie jest stale, wedruje on wyzej przy wiekszych natezeniach przeplywu cieozy i nizej - przy mniejszych* Z dolnym koncem ? toru cieczy 2 polaczony jest pionowy odcinek rurociagu o wysokosci h%9 który prze¬ chodzi nastepnie w odcinek poziomy, laczacy sie w punkcie D z torem gazu 3* 0 ile strata cisnienia w torze gazu 3 jest pomijalnie mala, to wysokosc h0 punktu C wzgledem punktu D bedzie liczbowo równa stratom cisnienia w torze pomiarowym cieczy 2* Cisnienie slupa cie¬ czy o wysokosci h. powoduje przetlaczanie cieczy w torze cieczy na skutek grawitacji* s Wysokosc5 hB tego slupa cieczy nie moze w zadnym wypadku przekroczyc wartosci maksymalnej h ____, bo ciecz dostalaby sie do toru pomiarowego gazu 3* Znane prawa hydrauliki umozli¬ wiaja analityczne obliczenie tej wartosci* Jezeli natezenie przeplywu cieczy jest niewielkie, lub jesli nastapi przerwa w doplywie cieczy, wysokosc ta ustali sie bliska lub równa zeru, pod warunkiem, ze straty cisnienia w torze pomiarowym gazu 3 sa znikome* Przy duzych przeplywach gazu straty te wywoluja róznice cisnien miedzy punktami B i D, która dazy do wypchniecia korka cieczy z odcinka F-D i przedostanie sie gazu do toru cieczy 2* Zabezpiecza przed tym pionowy odcinek ruro¬ ciagu o wysokosci h • Musi byó ona tak dobrana, aby cisnienie tego slupa cieczy bylo wiek¬ sze od straty cisnienia w torze gazu 3, przy maksymalnym spodziewanym natezeniu przeplywu gazu* Maksymalna wartosc tej wysokosci hg maT mozna równiez wyznaczyc analitycznie* Zasadnicza sprawa jest takie dobranie dlugosci kata nachylenia i srednicy separatora faz 1 aby uzyskac zadawalajace rozwarstwienie faz* Zalezy to od wielu czynników jak lep¬ kosc i gestosc mediów, czy stopien rozdrobnienia jednej fazy w drugiej* Dobór ten przepro¬ wadza sie eksperymentalnie na obiekcie rzeczywistym lub na modelu w warunkach laboratoryj¬ nych* W zaleznosci od potrzeb w jednym z dwu torów pomiarowyoh 2, 3, albo w obu równoczes¬ nie zainstalowuje sie przeplywomierz 6,7* Zastrzezenia patentowe 1* Urzadzenie do pomiaru natezenia przeplywu skladników dwufazowej mieszaniny plynów o róznych gestosciach, zawierajace rozdzielacz obu faz i co najmniej jeden przeplywomierz, znamienne tym, ze ma odcinek /AS/ rurociagu/, którego wlot /A/ jest na poziomie wyzszym niz wylot /E/, przy czym w górnej jego czesci /AC/, stanowiacej separator faz /1/, wykonane jest odprowadzenie /B/ w góre do toru pomiarowego fazy o mniejszej gestosci /3/9 natomiast dolna czesó /CE/ tego odcinka rurociagu /AE/ stanowi tor pomiarowy fazy o wiek¬ szej gestosci /2/* 2* Urzadzenie wedlug zastrz* 1, znamienne tym, ze w co najmniej jednym torze pomiarowym /2, 3/ zamontowany jest przeplywomierz /6, 7/* 3* Urzadzenie wedlug zastrz* 1 albo 2, znamienne tym, ze z dolnym koncem /?/ toru pomiarowego fazy o wiekszej gestosci polaczony jest odcinek rurociagu /5/ o ogólnym kierunku w góre*143 998 CD LU / PLThe subject of the invention is a device for measuring the flow rate of the components of a two-phase mixture of fluids of different densities. There is a known device for measuring the flow rate of the components of a two-phase mixture of liquids consisting of a device separating the two phases. These are usually large and costly cyclones, where the phase separation takes place under the influence of centrifugal forces and gravity * After phase separation, the individual components are measured with flowmeters. In the event that only the liquid phase is to be measured, a given type of variable-level flowmeter, consisting of a reservoir and an outflow tube, may be used. The gas phase is released into the atmosphere. The known solutions are technologically complex and expensive. According to the invention, the measuring device has a section of the pipeline, the inlet of which is at a level higher than the outlet. The upper part of this section of the pipeline, constituting the phase separator, has an outlet upwards to the measuring path of the less dense phase, and its lower part is the higher density. A flowmeter is mounted in at least one measuring line. A section of the pipeline with a general upwards direction is connected to the lower end of the higher-density phase measuring line. The device according to the invention performs the measurement with the use of extremely modest technical means made of typical, mass-produced fittings elements. Any conventional solution of flowmeters can be used for the measurement. The subject of the invention is illustrated in the example of the embodiment in the drawing showing schematically a device for measuring the flow rate of a two-phase mixture of liquid and gas. This device has a section of AC pipeline inclined at an appropriate angle to the horizontal. It delaminates the mixture of liquid and gas under the influence of gravitational forces.2 143 993 This section AC is at the same time a phase separator 1. The gas at the top of the pipeline passes into the gas measuring line 3 through port B in the section of pipeline AC * In the pipeline , below the upper section of AC, there is a heavier liquid, descending to points fi and F, the lowest in the device * The section of the pipeline below point C where the flowing liquid already occupies the entire cross-section of the pipeline, constitutes the liquid path 2 * The position of this point is not constant , it travels higher with higher flow rates and lower - with lower * With the lower end? a vertical section of the pipeline with a height h% 9 is connected, which then passes into a horizontal section, connecting at point D with the gas line 3 * 0 if the pressure loss in the gas line 3 is negligible, then the height h0 of point C with respect to point D will be numerically equal to the pressure loss in the measuring line of the liquid 2 * The pressure of the liquid column of height h causes the liquid to be forced through the liquid path due to gravity * s The height of 5 hB of this column of liquid must not exceed the maximum value h ____, because the liquid would enter the gas measuring path 3 * The known laws of hydraulics allow the analytical calculation of this value * If the flow rate of the liquid is low, or if there is a liquid interruption, the height will be set close to or equal to zero, provided the pressure loss is in gas measurement path 3 are negligible * With high gas flows, these losses create a pressure difference between points B and D, which tends to push out the drain plug tines from the FD section and gas entering the liquid path 2 * It protects against this the vertical section of the pipeline with a height h • It must be selected so that the pressure of this column of liquid is greater than the pressure loss in the gas path 3, at the maximum the expected gas flow rate * The maximum value of this height hg maT can also be determined analytically * The main thing is to select the length of the inclination angle and the diameter of the phase separator 1 to obtain a satisfactory phase stratification * It depends on many factors such as viscosity and density of the media, or the degree of fragmentation of one phase in the other * This selection is carried out experimentally on a real object or on a model under laboratory conditions * Depending on the needs, in one of the two measuring lines 2, 3, or in both, a flow meter 6 is installed simultaneously, 7 * Patent claims 1 * Device for measuring the flow rate of the components of a two-phase mixture of liquids of various densities, including a two-phase separator and at least one flowmeter, characterized in that it has a section / AS / pipeline / whose inlet / A / is at a level higher than the outlet / E /, with the upper part / AC / being a phase separator / 1 /, there is a discharge / B / upwards to the measurement path of the phase of lower density / 3/9, while the lower part / CE / of this section of the pipeline / AE / is the measurement path of the phase of greater density / 2 / * 2 * Device according to claim * 1, characterized in that at least one measuring line / 2, 3 / a flow meter / 6, 7 / * 3 * A device according to claim * 1 or 2, characterized in that the lower end /? / track measuring phase of greater density, a section of pipeline / 5 / with a general upward direction is connected * 143 998 CD LU / PL

Claims (3)

Zastrzezenia patentowe 1. * Urzadzenie do pomiaru natezenia przeplywu skladników dwufazowej mieszaniny plynów o róznych gestosciach, zawierajace rozdzielacz obu faz i co najmniej jeden przeplywomierz, znamienne tym, ze ma odcinek /AS/ rurociagu/, którego wlot /A/ jest na poziomie wyzszym niz wylot /E/, przy czym w górnej jego czesci /AC/, stanowiacej separator faz /1/, wykonane jest odprowadzenie /B/ w góre do toru pomiarowego fazy o mniejszej gestosci /3/9 natomiast dolna czesó /CE/ tego odcinka rurociagu /AE/ stanowi tor pomiarowy fazy o wiek¬ szej gestosci /2/*Claims 1. * A device for measuring the flow rate of the components of a two-phase mixture of fluids of different densities, including a splitter for both phases and at least one flow meter, characterized by the fact that it has a section / AS / pipeline / whose inlet / A / is at a level higher than outlet / E /, where in the upper part / AC /, which is a phase separator / 1 /, there is a discharge / B / upwards to the measurement path of the phase of lower density / 3/9, while the lower part / CE / of this section of the pipeline / AE / is a measuring path of a phase of greater density / 2 / * 2. * Urzadzenie wedlug zastrz* 1, znamienne tym, ze w co najmniej jednym torze pomiarowym /2, 3/ zamontowany jest przeplywomierz /6, 7/*2. * Device according to claim 1, characterized in that at least one measuring line / 2, 3 / has a flow meter / 6, 7 / * 3. * Urzadzenie wedlug zastrz* 1 albo 2, znamienne tym, ze z dolnym koncem /?/ toru pomiarowego fazy o wiekszej gestosci polaczony jest odcinek rurociagu /5/ o ogólnym kierunku w góre*143 998 CD LU / PL3. * Device according to claim * 1 or 2, characterized in that a section of the pipeline / 5 / with a general upward direction is connected to the lower end /? / Of the measuring path of the phase of greater density * 143 998 CD LU / PL
PL24701284A 1984-04-02 1984-04-02 Apparatus for measuring flow rate of components of two-phase mixture of fluids having different densities PL143998B1 (en)

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Application Number Priority Date Filing Date Title
PL24701284A PL143998B1 (en) 1984-04-02 1984-04-02 Apparatus for measuring flow rate of components of two-phase mixture of fluids having different densities

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PL24701284A PL143998B1 (en) 1984-04-02 1984-04-02 Apparatus for measuring flow rate of components of two-phase mixture of fluids having different densities

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PL247012A1 PL247012A1 (en) 1985-10-08
PL143998B1 true PL143998B1 (en) 1988-04-30

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