Method and system for metered supply of methanol and/or water to a fuel-cell system
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United States of America Patent
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-
Jun 16, 1998
Grant Date -
N/A
app pub date -
Jul 20, 1995
filing date -
Jul 20, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and a system meters a supply of methanol and/or water out of a storage reservoir to a fuel-cell system by way of a conveying conduit with a metering valve. A constant mass flow is conveyed out of the storage reservoir into the conveying conduit via a conveying pump. The differential pressure between the conveying conduit and fuel-cell system is set at a predetermined value via a differential-pressure controller which is arranged in a return conduit provided between the conveying conduit and storage reservoir. The methanol and/or water supplied can be set, for example, by varying the opening and closing times of a solenoid valve. A second metering stage can be provided in the return conduit downstream of the first metering stage. When two separate metering systems are used, a common pump motor can be employed.
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