Nitrogen gas generator and system for filtering high-pressure fuel cell exhaust gas

The nitrogen gas generation system using a fuel cell's exhaust gas efficiently produces high-purity nitrogen by filtering through hollow fibers, addressing inefficiencies in current methods and integrating with fuel cell systems for multi-energy supply.

JP7765109B2Active Publication Date: 2025-11-06MICRO CONTROL SYST LTD
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Patent Information

Application Number
JP2024049324
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-03-26
Publication Date
2025-11-06
Estimated Expiration
2039-03-13

AI Technical Summary

Technical Problem

Current methods for producing high-purity nitrogen gas are inefficient and require significant energy input, such as cryogenic air separation and pressure swing adsorption, and do not effectively utilize the exhaust gases from fuel cells for nitrogen production.

Method used

A nitrogen gas generation system using a fuel cell to produce high-pressure exhaust gas, which is filtered through hollow fibers to separate nitrogen and oxygen, with pressure control mechanisms to achieve high nitrogen concentration and purity, potentially utilizing the heat from the fuel cell for efficient nitrogen production.

Benefits of technology

The system efficiently generates high-purity nitrogen gas with reduced oxygen concentration, eliminating the need for additional pressure boosting and energy input, and integrates with fuel cell systems for simultaneous electricity and thermal energy supply.

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Abstract

To provide a device that efficiently generates high-purity nitrogen gas by using a fuel cell.SOLUTION: Provided is a nitrogen gas generation device comprising: a fuel cell; a filter that includes at least a hollow yarn capable of separating between nitrogen and oxygen and whose high lower-limit pressure is determined because of the use of the hollow yarn; pressure control means which is capable of supplying air or an oxygen-containing gas having pressure equal to or higher than a pressure threshold that is set based on said high lower-limit pressure to the fuel cell, and which enables an exhaust gas discharged from the activated fuel cell and having pressure equal to or higher than said pressure threshold to be supplied to the filter; a filter input / output unit that introduces into the filter the exhaust has having pressure equal to or higher than said pressure threshold while maintaining the pressure at said pressure threshold or higher, and which removes, from the filter, the exhaust gas whose nitrogen concentration has increased; and general control means that causes the pressure control means to exercise pressure control so that the nitrogen concentration in the exhaust gas whose nitrogen concentration has increased becomes a desired high nitrogen concentration.SELECTED DRAWING: Figure 1
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