WO2007051559A1 - Use of diaphragm valves for flow regulation - Google Patents
Use of diaphragm valves for flow regulation Download PDFInfo
- Publication number
- WO2007051559A1 WO2007051559A1 PCT/EP2006/010314 EP2006010314W WO2007051559A1 WO 2007051559 A1 WO2007051559 A1 WO 2007051559A1 EP 2006010314 W EP2006010314 W EP 2006010314W WO 2007051559 A1 WO2007051559 A1 WO 2007051559A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diisocyanate
- flow
- flow rate
- valves
- diaphragm valves
- Prior art date
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
Definitions
- the present invention relates to the use of commercially available diaphragm valves as control valves for flow control, and control devices containing such diaphragm valves for the continuous control of a gas or liquid flow.
- flowmeters provided with an initiator are used for this purpose. This initiator works as a binary contact and tells you if the flow is above or below a certain value.
- a second version of this flow monitoring has two binary contacts. This version uses a special controller as input signal. This then controls a servomotor via a converter to a needle valve.
- a servomotor via a converter to a needle valve.
- analog systems that have a bypass capillary, but which is hardly used because of the strong tendency of the capillary to block.
- Pneumatically actuated, metal-sealed diaphragm valves have been used and proven in the industry for many years as "open / close" high density valves in the industry, such as the Swagelok Company, Ohio DP Series DP valves or the Parker Model VSM TYP 944 AOP LP ,
- valves are conventionally used only in open / close circuit since, in the prevailing opinion, these systems can only be controlled discreetly and not continuously.
- the commercially available diaphragm valves can very well also be activated continuously and thus in principle be able to regulate a flow as desired or to maintain it constant.
- a first subject of the present application is therefore the use of diaphragm valves for continuous control of a fluid flow rate.
- Another object of the present application is a device for continuous control of a fluid flow rate, comprising a diaphragm valve.
- Another object of the present application is a plant for the production of any product, characterized in that at least one fluid flow rate by means of a device containing a diaphragm valve is controlled.
- the construction according to the invention and the use according to the invention are in principle suitable for all processes in which gaseous or liquid streams are monitored and controlled, especially for processes in which streams of highly toxic substances, e.g. Phosgene, need to be controlled.
- highly toxic substances e.g. Phosgene
- BPA bisphenol A
- DPC diphenyl carbonate
- PC polycarbonate
- MDI methylene diphenyl diisocyanate
- TDI toluene diisocyanate
- HDI hexamethylene diisocyanate
- IPDI isophorone diisocyanate
- the structure (sketch) of the flow control is as follows (Figure 1): In the flow direction of the substance to be controlled first sits the pneumatically controllable diaphragm valve used as an actuator. This is followed by a flow meter with analog signal output. The measured product stream is then fed to the analyzer.
- the control is structured as follows: The measured product flow is fed to the PID controller in analog form as an actual value. Depending on the setpoint / actual value comparison, the controller supplies an analog signal which is fed to an I / P converter. This I / P converter converts the current signal into a pneumatic signal, which is then applied to the diaphragm valve. In this way, the flow can be controlled very accurately.
- I / P converter converts the current signal into a pneumatic signal, which is then applied to the diaphragm valve. In this way, the flow can be controlled very accurately.
- other arrangements and components can be chosen, which ensure the determination of the flow, the derivation of a control signal and finally the appropriate control of the valve.
- methylene diisocyanate MDI
- the phosgene concentration was measured in two monochlorobenzene streams by cyclically switching the currents to a measuring device. Since different pressures were present in the streams, the flow had to be regulated.
- a diaphragm valve from Swagelok Type 6LVV DPS6m-C was integrated into the system and controlled by a PID controller of a Siemens C7 and an IP converter Type 6112 from Samson. The analog signal from the flowmeter was recorded on a recorder.
Abstract
The present invention relates to the use of commercially available diaphragm valves as regulating valves for flow control, and to control devices which comprise diaphragm valves of this type for the continuous control of a gas or liquid flow.
Description
Verwendung von Membranventilen zur Durchflussregelung.Use of diaphragm valves for flow control.
Die vorliegende Erfindung betrifft die Verwendung handelsüblicher Membranventile als Regelventile für die Durchflusssteuerung, sowie Steuerungseinrichtungen enthaltend solche Membranventile zur kontinuierlichen Steuerung eines Gas- oder Flüssigkeitsstromes.The present invention relates to the use of commercially available diaphragm valves as control valves for flow control, and control devices containing such diaphragm valves for the continuous control of a gas or liquid flow.
In vielen chemischen Herstellungsverfahren ist für eine genaue prozessanalytische Messung der die Messung und Regelung einer Durchflussmenge eines an der chemischen Reaktion beteiligten Gases, einer Flüssigkeit, wie den Edukten aber auch des Reaktionsgemisches notwendig. Häufig handelt es sich dabei auch um hochtoxische Gase oder Flüssigkeiten wie z. B. Phosgen, so dass die Regelungseinheiten neben einer präzisen Mengenregelung auch über eine außerordentliche Dich- tigkeit verfügen müssen.In many chemical manufacturing processes, the measurement and regulation of a flow rate of a gas involved in the chemical reaction, of a liquid, such as the educts but also of the reaction mixture, is necessary for an accurate process-analytical measurement. Often these are also highly toxic gases or liquids such. As phosgene, so that the control units in addition to a precise volume control must also have an extraordinary tightness.
In der Regel werden dazu Durchflussmesser, die mit einem Initiator versehen sind, eingesetzt. Dieser Initiator arbeitet als Binärkontakt und gibt Auskunft darüber, ob der Durchfluss über oder unter einem bestimmten Wert liegt.As a rule, flowmeters provided with an initiator are used for this purpose. This initiator works as a binary contact and tells you if the flow is above or below a certain value.
Eine zweite Version dieser Durchflussüberwachung besitzt zwei Binärkontakte. Diese Version nutzt ein spezieller Regler als Eingangssignal. Dieser steuert dann über einen Wandler einen Stellmotor an einem Nadelventil . Alternativ gibt es Analogsysteme, die über eine Bypasskapillare verfügen, die aber wegen der starken Verstopfungsneigung der Kapillare kaum zum Einsatz kommt.A second version of this flow monitoring has two binary contacts. This version uses a special controller as input signal. This then controls a servomotor via a converter to a needle valve. Alternatively, there are analog systems that have a bypass capillary, but which is hardly used because of the strong tendency of the capillary to block.
Diese Anordnungen haben jedoch den entscheidenden Nachteil nicht über eine für hochtoxische Medien ausreichende Dichtigkeit zu verfügen. Grundsätzlich ist für die Handhabung hochtoxischer Medien eine größtmögliche Dichtigkeit erforderlich.However, these arrangements do not have the decisive disadvantage of not having sufficient tightness for highly toxic media. Basically, the greatest possible tightness is required for the handling of highly toxic media.
Seit vielen Jahren sind pneumatisch angesteuerte, metallgedichtete Membranventile als „Auf/Zu" Ventile hoher Dichtigkeit in der Industrie im Einsatz und bewährt, so zum Beispiel Ventile der Serie DP der Firma Swagelok Company, Ohio oder der Firma Parker so Modell VSM TYP 944 AOP LP.Pneumatically actuated, metal-sealed diaphragm valves have been used and proven in the industry for many years as "open / close" high density valves in the industry, such as the Swagelok Company, Ohio DP Series DP valves or the Parker Model VSM TYP 944 AOP LP ,
Diese Ventile werden herkömmlich jedoch nur in Auf/Zu Schaltung eingesetzt, da nach herrschender Meinung diese Systeme nur diskret und nicht kontinuierlich angesteuert werden können.However, these valves are conventionally used only in open / close circuit since, in the prevailing opinion, these systems can only be controlled discreetly and not continuously.
Es wurde nun überraschend gefunden, dass man die handelsüblichen Membranventile sehr wohl auch kontinuierlich ansteuern und damit einen Durchfluss im Prinzip beliebig regeln bzw., kon- stant halten kann. Dazu wird erfindungsgemäß der Durchfluss durch einen handelsüblichen analogen Durchflussmesser, z. den DK37 der Firma Krohne gemessen, und über einen PID-Regler ein
Strom-Druck- Wandler angesteuert, der wiederum ein handelsübliches pneumatisch angesteuertes Membranventil, welches einen entsprechend zu regelnde Leitungsweg sitzt, stufenlos ansteuert und so den Mengenstrom stufenlos regelt.Surprisingly, it has now been found that the commercially available diaphragm valves can very well also be activated continuously and thus in principle be able to regulate a flow as desired or to maintain it constant. For this purpose, the flow through a commercially available analog flow meter, z. the DK37 from Krohne and a PID controller Current-pressure converter driven, in turn, a commercially available pneumatically controlled diaphragm valve, which sits a correspondingly regulated line path, steplessly controls and so infinitely controls the flow rate.
Erstaunlicherweise kann man durch den entsprechenden Einsatz dieser Membranventile die Durch- flüsse genauso präzise wie mit Nadelventilen regeln.Astonishingly, through the appropriate use of these diaphragm valves, the flows can be regulated just as precisely as with needle valves.
Ein erster Gegenstand der vorliegenden Anmeldung ist daher die Verwendung von Membranventilen zur stufenlosen Steuerung eines fluiden Mengenstromes.A first subject of the present application is therefore the use of diaphragm valves for continuous control of a fluid flow rate.
Ein weiterer Gegenstand der vorliegenden Anmeldung ist eine Vorrichtung zur stufenlosen Steuerung eines fluiden Mengenstromes, enthaltend ein Membranventil.Another object of the present application is a device for continuous control of a fluid flow rate, comprising a diaphragm valve.
Ein weiterer Gegenstand der vorliegenden Anmeldung ist eine Anlage zur Herstellung eines beliebigen Produkts dadurch gekennzeichnet, dass mindestens ein fluider Mengenstrom mittels einer Vorrichtung enthaltend ein Membranventil gesteuert wird.Another object of the present application is a plant for the production of any product, characterized in that at least one fluid flow rate by means of a device containing a diaphragm valve is controlled.
Der erfmdungsgemäße Aufbau und die erfmdungsgemäße Verwendung sind grundsätzlich für alle Verfahren geeignet, in welchen gasförmige oder flüssige Stoffströme überwacht und angesteuert werden, besonders für Verfahren in denen Stoffströme hoch toxischer Stoffe, z.B. Phosgen, gesteuert werden müssen.The construction according to the invention and the use according to the invention are in principle suitable for all processes in which gaseous or liquid streams are monitored and controlled, especially for processes in which streams of highly toxic substances, e.g. Phosgene, need to be controlled.
Beispiele für solche Verfahren sind insbesondere Verfahren zur Herstellung von Bisphenol-A (BPA), Diphenylcarbonat (DPC), Polycarbonat (PC), Methylendiphenyldiisocyanat (MDI), Toluy- lendiisocyanat (TDI), Hexamethylendiisocyanat (HDI) und Isophorondiisocyanat (IPDI).Examples of such processes are in particular processes for the preparation of bisphenol A (BPA), diphenyl carbonate (DPC), polycarbonate (PC), methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI).
In einer bevorzugten Ausführungsform der Erfindung sieht der Aufbau (Skizze) der Durchflussregelung folgendermaßen aus (Figur 1): In Strömungsrichtung des zu regelnden Stoffes sitzt zunächst das als Stellglied verwendete pneumatisch ansteuerbare Membranventil. Anschließend folgt ein Durchflussmesser mit analogem Signalausgang. Der gemessene Produktstrom wird dann dem Analysengerät zugeführt.In a preferred embodiment of the invention, the structure (sketch) of the flow control is as follows (Figure 1): In the flow direction of the substance to be controlled first sits the pneumatically controllable diaphragm valve used as an actuator. This is followed by a flow meter with analog signal output. The measured product stream is then fed to the analyzer.
Die Regelung ist folgendermaßen aufgebaut: Der gemessene Produktstrom wird dem PID-Regler in analoger Form als Istwert zugeführt. Der Regler liefert in Abhängikeit vom Soll/Istwert- Vergleich ein Analogsignal das einem I/P-Wandler zugeführt wird. Dieser I/P-Wandler formt das Stromsignal in ein pneumatisches Signal um, mit dem dann das Membranventil beaufschlagt wird. Auf diese Weise kann der Durchfluss sehr genau geregelt werden.
Natürlich können auch andere Anordnungen und Bauteile gewählt werden, welche die Bestimmung des Durchflusses, die Ableitung eines Steuersignals und schließlich die entsprechende Ansteuerung des Ventils gewährleisten.The control is structured as follows: The measured product flow is fed to the PID controller in analog form as an actual value. Depending on the setpoint / actual value comparison, the controller supplies an analog signal which is fed to an I / P converter. This I / P converter converts the current signal into a pneumatic signal, which is then applied to the diaphragm valve. In this way, the flow can be controlled very accurately. Of course, other arrangements and components can be chosen, which ensure the determination of the flow, the derivation of a control signal and finally the appropriate control of the valve.
Das nachfolgende Beispiel soll die Erfindung illustrieren ohne sie jedoch zu beschränken:The following example is intended to illustrate the invention without, however, limiting it:
In einer Anlage zur Herstellung von Methylendiisocyanat (MDI) wurden in zwei Monochlorben- zol-Strömen mittels zyklischer Umschaltung der Ströme auf ein Messgerät die Phosgenkonzentration gemessen. Da in den Strömen unterschiedliche Drücke vorlagen, mußte der Durchfluss geregelt werden. Zur Regelung wurde ein Membranventil der Fa. Swagelok Typ 6LVV DPS6m-C in die Anlage integriert und über ein PID-Regler einer Siemens C7 und eines IP-Wandlers Typ 6112 der Fa. Samson angesteuert. Das Analogsignal des Durchflussmessers wurde auf einem Schreiber festgehalten.In a plant for the production of methylene diisocyanate (MDI), the phosgene concentration was measured in two monochlorobenzene streams by cyclically switching the currents to a measuring device. Since different pressures were present in the streams, the flow had to be regulated. To control this, a diaphragm valve from Swagelok Type 6LVV DPS6m-C was integrated into the system and controlled by a PID controller of a Siemens C7 and an IP converter Type 6112 from Samson. The analog signal from the flowmeter was recorded on a recorder.
Es wurde gefunden, dass sich der Durchfluss entgegen der herrschenden Meinung mittels eines Membranventils stufenlos regeln ließ.
It was found that the flow could be infinitely regulated by means of a diaphragm valve, contrary to the prevailing opinion.
Claims
1. Verwendung von Membranventilen zur stufenlosen Steuerung eines fluiden Mengenstromes.1. Use of diaphragm valves for stepless control of a fluid flow rate.
2. Vorrichtung zur stufenlosen Steuerung eines fluiden Mengenstromes, enthaltend ein Membranventil.2. A device for stepless control of a fluid flow rate, comprising a diaphragm valve.
3. Verfahren zur Herstellung eines Produkts, dadurch gekennzeichnet, dass mindestens ein fluider Mengenstrom unter Verwendung eines Membranventils stufenlos gesteuert wird.3. A process for the preparation of a product, characterized in that at least one fluid flow rate is controlled continuously using a diaphragm valve.
4. Verfahren gemäß Anspruch 3, dadurch gekennzeichnet, dass das Produkt Bisphenol-A (BPA), Diphenylcarbonat (DPC), Polycarbonat (PC), Methylendiphenyldiisocyanat (MDI), Toluylendiisocyanat (TDI), Hexamethylendiisocyanat (HDI) oder Isophorondiisocyanat4. The method according to claim 3, characterized in that the product bisphenol-A (BPA), diphenyl carbonate (DPC), polycarbonate (PC), methylene diphenyl diisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI) or isophorone diisocyanate
(EPDI) ist.(EPDI).
5. Anlage zur Herstellung eines Produkts dadurch gekennzeichnet, dass mindestens ein fluider Mengenstrom mittels einer Vorrichtung nach Anspruch 2 gesteuert wird.5. Plant for the production of a product characterized in that at least one fluid flow rate is controlled by means of a device according to claim 2.
6. Anlage gemäß Anspruch 5, dadurch gekennzeichnet, dass das Produkt Bisphenol-A (BPA), Diphenylcarbonat (DPC), Polycarbonat (PC), Methylendiphenyldiisocyanat (MDI), Toluylendiisocyanat (TDI), Hexamethylendiisocyanat (HDI) oder Isophorondiisocyanat (IPDI) ist. 6. Plant according to claim 5, characterized in that the product is bisphenol A (BPA), diphenyl carbonate (DPC), polycarbonate (PC), methylene diphenyl diisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI) or isophorone diisocyanate (IPDI) ,
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005053341.8 | 2005-11-07 | ||
DE200510053341 DE102005053341A1 (en) | 2005-11-07 | 2005-11-07 | Use of diaphragm valves for flow control |
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WO2007051559A1 true WO2007051559A1 (en) | 2007-05-10 |
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PCT/EP2006/010314 WO2007051559A1 (en) | 2005-11-07 | 2006-10-26 | Use of diaphragm valves for flow regulation |
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WO (1) | WO2007051559A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0611908A1 (en) * | 1993-02-15 | 1994-08-24 | Fedegari Autoclavi Spa | Improved control member for diaphragm valve, in particular for steam valves |
US5755428A (en) * | 1995-12-19 | 1998-05-26 | Veriflow Corporation | Valve having metal-to metal dynamic seating for controlling the flow of gas for making semiconductors |
WO1999015823A1 (en) * | 1997-09-22 | 1999-04-01 | Fisher Controls International, Inc. | Diagnostic device and method for pressure regulator |
US6382226B1 (en) * | 2001-04-17 | 2002-05-07 | Fisher Controls International, Inc. | Method for detecting broken valve stem |
-
2005
- 2005-11-07 DE DE200510053341 patent/DE102005053341A1/en not_active Withdrawn
-
2006
- 2006-10-26 WO PCT/EP2006/010314 patent/WO2007051559A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0611908A1 (en) * | 1993-02-15 | 1994-08-24 | Fedegari Autoclavi Spa | Improved control member for diaphragm valve, in particular for steam valves |
US5755428A (en) * | 1995-12-19 | 1998-05-26 | Veriflow Corporation | Valve having metal-to metal dynamic seating for controlling the flow of gas for making semiconductors |
WO1999015823A1 (en) * | 1997-09-22 | 1999-04-01 | Fisher Controls International, Inc. | Diagnostic device and method for pressure regulator |
US6382226B1 (en) * | 2001-04-17 | 2002-05-07 | Fisher Controls International, Inc. | Method for detecting broken valve stem |
Non-Patent Citations (1)
Title |
---|
ANONYMOUS: "QUANTUM 944AOPLP Air Operated Low Pressure Diaphragm Vallve", 31 October 2004 (2004-10-31), pages 1 - 3, XP002418793, Retrieved from the Internet <URL:http://web.archive.org/web/20041031012215/http:/www.parker.com/veriflo/Discontinued_Lit/944AOPLP.pdf> [retrieved on 2070206] * |
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DE102005053341A1 (en) | 2007-05-10 |
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