Exhaust gas treatment device and fuel cell system

A bypass branch in the exhaust gas treatment device for fuel cell systems optimizes the aftertreatment unit's efficiency and reduces emissions by diverting a portion of the exhaust gas flow, addressing the inefficiencies and resource challenges of existing systems.

DE102024134485A1Pending Publication Date: 2026-05-28ROBERT BOSCH GMBH
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Patent Information

Application Number
DE102024134485
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing exhaust gas treatment devices for fuel cell systems face challenges in efficiently managing fuel residues and pollutants like nitrogen oxides and volatile organic compounds, leading to high emissions and catalyst poisoning, while requiring significant space and resources.

Method used

The introduction of a bypass branch that diverts a portion of the exhaust gas flow away from the aftertreatment unit, allowing for controlled operation with adjustable flow rates and oxygen supply, optimizing the aftertreatment unit's efficiency and reducing catalyst poisoning.

Benefits of technology

This design achieves low emissions of carbon monoxide and volatile organic compounds, extends the aftertreatment unit's service life, and minimizes resource usage, while maintaining efficient conversion of fuel residues.

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Abstract

The invention relates to an exhaust gas treatment device (10a; 10b; 10c; 10d; 10e) for a fuel cell system (12a; 12d; 12e), which is designed to electrochemically convert at least one fuel into at least one exhaust gas, with at least one exhaust gas line (14a; 14b; 14c; 14d; 14e) for the discharge of the at least one exhaust gas and with at least one after-treatment unit (16a; 16b; 16c; 16d; 16e) connected to the at least one exhaust gas line (14a; 14b; 14c; 14d; 14e) for a catalytic and / or thermal conversion of fuel residues contained in the at least one exhaust gas. It is proposed that the at least one exhaust line (14a; 14b; 14c; 14d; 14e) includes at least one bypass branch (18a; 18b; 18c; 18d; 18e) which bypasses the at least one after-treatment unit (16a; 16b; 16c; 16d; 16e).
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Citation Information

Patent Citations

  • Auxiliary Power Unit for road vehicle has fuel cell running on synthesis gas and process air and has water cooling and has exhaust gas fed through valve to building block containing catalytic converter

    DE102004049587A1

  • fuel cell system

    DE102007039082A1

  • Fuel cell system for motor car, has bypass guide connected with cathode exhaust gas guide, through which cathode exhaust gas is conductible, and conveyor device is provided downstream of fuel cell for conveying cathode exhaust gas

    DE102011085758A1