WO2011076355A1 - Dispositif d'alimentation en gaz avec capteur de débit massique - Google Patents

Dispositif d'alimentation en gaz avec capteur de débit massique Download PDF

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Publication number
WO2011076355A1
WO2011076355A1 PCT/EP2010/007621 EP2010007621W WO2011076355A1 WO 2011076355 A1 WO2011076355 A1 WO 2011076355A1 EP 2010007621 W EP2010007621 W EP 2010007621W WO 2011076355 A1 WO2011076355 A1 WO 2011076355A1
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WO
WIPO (PCT)
Prior art keywords
gas
mass flow
gas supply
heating
supply device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2010/007621
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German (de)
English (en)
Inventor
Reinhard Frank
Sven Butschek
Andreas Schiegl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Truma Geraetetechnik GmbH and Co KG
Original Assignee
Truma Geraetetechnik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Truma Geraetetechnik GmbH and Co KG filed Critical Truma Geraetetechnik GmbH and Co KG
Publication of WO2011076355A1 publication Critical patent/WO2011076355A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects

Definitions

  • the invention relates to a gas supply device and a method for supplying gas from a gas supply device to a gas consumption device.
  • the supply of gas is z. B. necessary as part of a liq ssiggasdostechnik for heaters or reformer fuel cell systems that are used for on-board power supply in recreational vehicles, commercial vehicles and boats.
  • Liquefied petroleum gas is generally offered in different compositions, which may vary regionally as well as seasonally.
  • the gas is withdrawn from the gaseous phase of a tank, there occurs an effect that the gas composition changes during the purge operation due to different vapor pressures.
  • the compounds with higher vapor pressures and, in the course of emptying, more and more molecules of compounds with low vapor pressure tend to be taken out first.
  • a gas appliance must therefore be able to work with 100% propane and 100% butane.
  • the volume flow is measured, which may result in a defined volume flow of propane and butane, a difference in the amount of carbon or in the calorific value of up to about 36%. This results mainly from the different densities of the gases.
  • the amount of carbon and the calorific value vary considerably depending on the quality and composition of the supplied liquefied gas.
  • a disadvantage of the devices and methods mentioned here is that the different material properties of the liquefied gas, i. of the propane-butane mixture, only insufficiently taken into account.
  • the heating power can vary depending on the composition of the LPG.
  • the invention is therefore based on the object to provide a remplissiggasdosiervorraum or a gas supply device and a corresponding method, whereby a safe and continu ously operation of a gas consuming device with as constant as possible performance even with changing It is possible to achieve variable gas compositions without having to measure the gas composition.
  • the basic idea of the invention is based on the use of the principle of the thermal mass flow measurement for the liquid gas metering, whereby the abovementioned disadvantages or inaccuracies in the prior art can be largely eliminated.
  • a gas supply device for supplying gas from a gas storage device to a gas consuming device comprises a gas line device extending between the gas storage device and the gas consuming device, and a thermal mass flow measuring device provided in the gas line device for measuring the gas quantity of the gas flowing in the gas line device due to its mass flow.
  • the principle of thermal mass flow measurement is based on passing a gas stream over a cooled or heated area. As a result, the medium is heated or cooled. Depending on the technical design is closed by the formation of a temperature profile, the heating or cooling power used or due to temperature changes to the mass flow of the medium, since the heat transfer into the gas is dependent on the mass flow. In addition, the measurement depends on the specific heat capacity of the medium to be measured.
  • the mass flow measuring device may comprise: a heating or cooling element, a first temperature sensor arranged upstream of the heating or cooling element, a second temperature sensor arranged downstream of the heating or cooling element, and an evaluation device for evaluating a first temperature measured by the first temperature sensor and a second temperature measured by the second temperature sensor and for driving the heating or cooling element.
  • the heating or cooling element can be controlled such that a constant temperature difference between the first temperature sensor and the second temperature sensor is adjusted, wherein the mass flow is determined on the basis of the requisite heating or cooling power.
  • the heating or cooling element can be set to a predetermined heating or cooling power, the mass flow being ascertained on the basis of a subsequently measured temperature difference between the first temperature sensor and the second temperature sensor.
  • the heating element can be regulated to a constant temperature difference between the two temperature sensors, wherein from the heating power is then closed to the mass flow.
  • the occurring temperature differences between the temperature measuring points are evaluated at a defined heat output and thus deduced the mass flow.
  • a controllable valve means for adjusting the mass flow in the gas line device, wherein a controller is provided for driving the valve device in response to a measurement signal from the mass flow measuring device.
  • the controller may be designed such that it maintains the mass flow of the gas flowing in the gas line device to a predetermined value by actuating the valve device.
  • the measuring method makes it possible to use the measuring method with an actuator, for. B. to combine a proportional valve or a control valve to form a control loop.
  • the measurement and control function can be z. B. integrated in a thermal mass flow controller or combined with this.
  • the method is basically suitable for all types of Gasverbrau chs driven, which are operated with gaseous hydrocarbons u er different gas compositions.
  • the gas consuming device and the gas supply device described can be used not only in recreational vehicles, boats and commercial vehicles, but also in all other appli ngs Suiteen (stationary, mobile), in which a gaseous hydrocarbon to be dosed.
  • the mass flow measuring device (also referred to as sensor in the following) is tuned by the manufacturer to a specific gas. Should the sensor be for a If another gas is used, a conversion factor must be calculated which converts the flow of one gas into that of the other gas.
  • the measuring principle described can be used in manifold gas appliances. Thus, it is possible to carry out a mass flow measurement based on the carbon mole flow in a reformer fuel cell system. In the case of a heating device, the mass flow measurement can be based on the heating or calorific value.
  • the controller can be designed in such a way that it substantially controls the carbon mole flow of the gas by activating the valve device keeps constant at a predetermined value.
  • this mass flow measurement based on the carbon mole flow can be used advantageously in a reformer fuel cell system.
  • the molar ratio of water (steam) to carbon (carbon) - the so-called S / C ratio - is decisive for the composition and quality of the hydrogen-containing reformer produced - matgases or even for the proper functioning and long-term stability of the reformer system itself.
  • the regulation of the S / C ratio for such systems is therefore crucial - especially when in practice the composition of the reformer fuel cell system supplied liquefied gas may have continuously changing propane and butane fractions.
  • the value of the S / C ratio is to be kept substantially constant with changing gas composition and given water supply, then a defined carbon flow can be provided.
  • the molar flow of carbon at the same mass flow of butane is about 1, 1% higher than propane. Taking into account the deviation from the mass flow measurement of propane and butane - with the same measuring signal of the mass flow measuring device 0, 54% less butane is metered (see explanation above) - the maximum total deviation of the carbon mole flow is 0.55%. This deviation is thus significantly below the deviations mentioned above.
  • a liquid gas metering based on the principle of thermal mass flow measurement represents a suitable method for a corresponding reformer system in order to measure the amount of liquid gas with respect to the S / C ratio or in combination with a control device, eg. B. a proportional valve, to regulate.
  • the mass flow measuring device can be used for measuring the mass flow of the liquefied gas.
  • a heating or calorific value of the gas flowing in the gas conduit means determinable.
  • the control can be designed such that it keeps the heating and / or calorific value of the gas essentially constant at a predetermined value by driving the valve device.
  • This related to the heating or calorific value mass flow measurement can be advantageously used in a heater.
  • the metering of liquefied petroleum gas in heating devices takes place via a diaphragm or nozzle, which may result in deviations of up to approximately 14% in the calorific value, depending on the dosage of propane and butane.
  • the result is fluctuating Schuleistu lengths of the heater, depending on the composition of the supplied propane-butane gas mixture it.
  • the system is also capable of compensating for variations due to pressure differences in pressure control. It has already been stated above that LPG metering is often carried out at a target value of 30 mbar. In practice, however, it is readily usual for the pressure values to be between 25 and 35 mbar. These pressure fluctuations cause fluctuations in the mass flow, which can be detected during the mass flow measurement and can be compensated by control technology in order to achieve a constant heating power.
  • a display device may be provided for displaying a mass flow value measured by the mass flow measuring device. This allows the operator, in addition to the controller or alternatively to the controller, to intervene in a regulating manner via a corresponding valve if the mass flow value is outside a predetermined tolerance range.
  • the gas line device may have a main gas line and a secondary gas line provided parallel thereto, wherein the mass flow measuring device may optionally be arranged both in the secondary gas line and in the main gas line. Corresponding correction values are then used to deduce the total gas quantity.
  • the mass flow measuring device may be provided separately from the gas consuming device. It is also possible to provide the measuring device to the Gasvorratseinrichtu ng or integrate into the gas appliance. The integration into the gas consuming device may be useful if the measuring method is combined with the valve device to form a control loop.
  • FIG. 1 shows the basic structure of a thermal mass flow measuring device
  • Fig. 2 shows the schematic structure of a gas consumption system with the erfindu ngsdorfen Gaszu Go Go supply device.
  • Fig. 1 shows in schematic form a Gasleitu ng 1, in which a mass flow m of a gas, for. B. a liquefied gas is being led.
  • a thermal mass flow meter 2 is used in the gas line 1, in which a thermal mass flow meter 2 is used.
  • the mass flow meter 2 has a heating or cooling element 3, a first temperature sensor 4 provided upstream thereof and a second temperature sensor 5 provided downstream thereof.
  • an evaluation device 6 is provided in the mass flow meter 2. In addition, it is still possible to provide additional measuring points for temperature measurement, if this increases the accuracy of measurement.
  • the heating or cooling element 3 (depending on the application, the mass flow can be heated or cooled) can be operated such that a constant temperature difference between the two temperature sensors 4, 5 sets. Accordingly, the evaluation device 6 controls the heating or cooling element 3 in order to maintain this constant temperature difference. From the necessary heating or cooling capacity can then be closed in a known manner to the mass flow.
  • Another possibility is to evaluate the temperature differences between the two tempera ture sensors 4, 5 at a defined heating and cooling power maintained by the evaluation device 6, and in this way to draw conclusions about the mass flow.
  • the mass flow can thus be determined as the gas mass per unit time.
  • Fig. 2 shows in schematic form a gas supply or consumption system.
  • the gas line 1 connects a serving as Gasvorratseinrichtu ng liquid gas supply 7 with a gas consumer 8 (gas consumption device).
  • a pressure regulator 9 Downstream of the liquefied gas reservoir 7, a pressure regulator 9 is provided with which the voltage applied to the liquefied gas reservoir 7, usually relatively high pressure to a suitable operating pressure, for. B. 30 mbar is regulated.
  • Downstream of the pressure regulator 9 is a check valve 10, z. B. a solenoid valve disposed, which can be controlled via a controller 1 1.
  • the Steueru ng 1 1 is thus able to open the gas supply to the gas consumer 8 via the check valve 1 0 and close.
  • the above-explained thermal mass flow meter 2 is arranged, to which a valve device 1 2 controllable via the controller 11 closes downstream.
  • the valve device 12 may be a solenoid valve, a control valve (for example a proportional valve) or a different type of actuator.
  • the gas consumer 8 Downstream of the valve device 12 is finally the gas consumer 8, z. B. a heater, adevorrichtg (air conditioning, refrigerator) or a reformer fuel cell system arranged.
  • the gas consumer 8 may in particular be burners (catalytic, conventional), reforming reactors, reaction chambers of fuel cells or combustion chambers of engines.
  • the mass flow meter 2 determines the carbon quantity in the gas guided via the gas line 1 and to transmit corresponding information to the control unit 1 1.
  • the controller 1 1 controls the valve device 1 2 such that a desired mass flow is achieved.
  • This desired mass flow is z. B. due to a desired heat output (for heating) or based on a desired S / C ratio for the reformer fuel cell system.
  • the components check valve 10, control 1 1, mass flow meter 2, valve device 12 and 8 gas consumers can be integrated in the form of a gas consumption system 13.
  • the gas consumption system 13 then contains in addition to the gas consumer 8 itself also the other components that are required to control the mass flow.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne un dispositif d'alimentation en gaz qui sert à acheminer du gaz d'un dispositif de stockage de gaz (7) vers un dispositif de consommation de gaz (8). À cet effet, il est prévu entre le dispositif de stockage de gaz (7) et le dispositif de consommation de gaz (8) un dispositif de conduit de gaz (1) dans lequel est disposé un débitmètre massique (2) destiné à mesurer la quantité de gaz du gaz s'écoulant dans le dispositif de conduit de gaz (1) sur la base du flux massique (m). Les valeurs de mesure du débitmètre massique (2) peuvent être fournies à une commande (11) qui commande à son tour un mécanisme de vanne (12) pour maintenir le débit massique à une valeur prédéfinie.
PCT/EP2010/007621 2009-12-23 2010-12-14 Dispositif d'alimentation en gaz avec capteur de débit massique Ceased WO2011076355A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910060302 DE102009060302A1 (de) 2009-12-23 2009-12-23 Gaszuführungsvorrichtung mit Massendurchflusssensor
DE102009060302.6 2009-12-23

Publications (1)

Publication Number Publication Date
WO2011076355A1 true WO2011076355A1 (fr) 2011-06-30

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PCT/EP2010/007621 Ceased WO2011076355A1 (fr) 2009-12-23 2010-12-14 Dispositif d'alimentation en gaz avec capteur de débit massique

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DE (1) DE102009060302A1 (fr)
WO (1) WO2011076355A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
USD907183S1 (en) 2016-11-23 2021-01-05 Dometic Sweden Ab Air conditioning apparatus
US11772452B2 (en) 2017-11-16 2023-10-03 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles
US12043081B2 (en) 2019-10-17 2024-07-23 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4537172A (en) * 1982-11-26 1985-08-27 Nippon Soken, Inc. Fuel supply control apparatus for an internal-combustion engine
EP0943900A1 (fr) * 1998-03-20 1999-09-22 Berkin B.V. Dispositif de mesure de l'écoulement d'un milieu
DE10017958A1 (de) * 1999-04-12 2000-12-21 Guenter Petram Vorrichtung zum Messen der Durchflussrate eines Mediums durch eine Leitung
US6371147B1 (en) * 1999-04-15 2002-04-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Evaluation and regulation of the thermal power of a flow of combustible gas; characterization of a thermal mass flowmeter
US20020121137A1 (en) * 2000-12-28 2002-09-05 Takeshi Fujiwara Flow sensor, method of manufacturing the same and fuel cell system
US20080113232A1 (en) * 2004-10-26 2008-05-15 Masataka Ozeki Fuel Cell System
US20090049907A1 (en) * 2007-08-24 2009-02-26 Siargo. Inc. Configuration and methods for manufacturing time-of-flight MEMS mass flow sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1065475B1 (fr) * 1999-05-31 2017-07-12 Sensirion Holding AG Procédé pour mesurer un courant de gaz
DE10127261B4 (de) * 2001-06-05 2005-02-10 Erbe Elektromedizin Gmbh Meßvorrichtung für die Strömungsrate eines Gases, insbesondere zum Einsatz in der Plasmachirurgie
DE102005057687A1 (de) * 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4537172A (en) * 1982-11-26 1985-08-27 Nippon Soken, Inc. Fuel supply control apparatus for an internal-combustion engine
EP0943900A1 (fr) * 1998-03-20 1999-09-22 Berkin B.V. Dispositif de mesure de l'écoulement d'un milieu
DE10017958A1 (de) * 1999-04-12 2000-12-21 Guenter Petram Vorrichtung zum Messen der Durchflussrate eines Mediums durch eine Leitung
US6371147B1 (en) * 1999-04-15 2002-04-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Evaluation and regulation of the thermal power of a flow of combustible gas; characterization of a thermal mass flowmeter
US20020121137A1 (en) * 2000-12-28 2002-09-05 Takeshi Fujiwara Flow sensor, method of manufacturing the same and fuel cell system
US20080113232A1 (en) * 2004-10-26 2008-05-15 Masataka Ozeki Fuel Cell System
US20090049907A1 (en) * 2007-08-24 2009-02-26 Siargo. Inc. Configuration and methods for manufacturing time-of-flight MEMS mass flow sensor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD907183S1 (en) 2016-11-23 2021-01-05 Dometic Sweden Ab Air conditioning apparatus
US11772452B2 (en) 2017-11-16 2023-10-03 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
USD944374S1 (en) 2018-09-05 2022-02-22 Dometic Sweden Ab Air conditioning apparatus
US12043081B2 (en) 2019-10-17 2024-07-23 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles

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