Patent US5432020A successfully refreshed from Google Patents.
US5432020A
Expired / Lapsed
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Process and apparatus for humidifying process gas for operating fuel cell systems
Assignee: Mercedes Benz Fuel Cell GmbH
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Filing: 1994-06-07
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Granted: 1995-07-11
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Expires: 2014-06-07
Abstract
Abstract A process and an apparatus humidify process gas for operating fuel cell systems. To ensure high efficiency, the process gas must be introduced at a predetermined temperature and humidity. A metered quantity of fine water droplets is injected into the gas supply line, by way of which the process air is humidified. If the fuel cell is operated under pressure, the process air generally has to be cooled after it has been compressed. The process air is automatically cooled as a result of a partial evaporation of the water droplets while the residual quantity of water in the form of droplets is introduced into the fuel cell.
Inventors
- 👤 Wolfram Fleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M8/04082; H01M8/04089; B; B60; B60L; B60L58/00; B60L58/30; B60L58/32; B60L58/33; H01M8/02; H01M8/0202; H01M8/0258; H01M8/0267; H01M8/04223; B60K; B60K1/00; B60K1/04; H01M2300/00; H01M2300/0017; H01M2300/0065; H01M2300/0082; H01M8/04119; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02T; Y02T90/00; Y02T90/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A process for humidifying process gas for operating fuel cells, comprising the step of injecting a metered quantity of finely atomized water into the process gas before the process gas enters into a supply line for supplying the fuel cell.
Claim 2
Dependent Claim
40 words
A process for humidifying process gas for operating fuel cells, comprising the step of injecting a metered quantity of finely atomized water into the process gas before the process gas enters into a supply line for supplying the fuel cell.
Claim 3
Dependent Claim
21 words
The process according to claim 1, wherein the metered quantity of injected water is determined as a function of operating conditions.
Claim 4
Dependent Claim
26 words
The process according to claim 1, wherein the injected water has droplets with a diameter smaller than a diameter of gas-conducting channels in the fuel cell.
Claim 5
Dependent Claim
21 words
The process according to claim 1, wherein the fuel cell is an air-breathing fuel cell, and the process air is humidified.
Claim 6
Independent Claim
49 words
An apparatus for humidifying process gas for an operating fuel cell, comprising a supply line for supplying process gas to the fuel cell, and a device for injecting a metered quantity of finely atomized water is arranged in the supply line before the process gas enters the fuel cell.
Claim 7
Independent Claim
49 words
An apparatus for humidifying process gas for an operating fuel cell, comprising a supply line for supplying process gas to the fuel cell, and a device for injecting a metered quantity of finely atomized water is arranged in the supply line before the process gas enters the fuel cell.
Claim 8
Dependent Claim
13 words
The device according to claim 5, wherein the device includes a water atomizer.
Claim 9
Dependent Claim
27 words
The device according to claim 5, wherein the device includes a water atomizer configured as one of an air-supported injection nozzle apparatus and an ultrasound atomizer apparatus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-10 | 1999-01-09 | 1999-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-10 | 2003-01-09 | 2003-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-10 | 2007-01-09 | 2007-07-11 | $7700.00 | Window Closed / Lapsed |