Fuel Cell Anode Recirculation Heat Exchange for Primary Fuel Preheating
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Solution Overview
Problem
Existing fuel cell systems face challenges in effectively preheating primary fuel while maintaining high pressure and minimizing pressure loss in the anode path.
Innovation Solution
The fuel cell system incorporates a primary fuel line that extends through a heat exchange volume within the recirculation line, allowing for effective heat transfer from the secondary fuel to the primary fuel, thereby preheating the primary fuel while maintaining high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the primary fuel is preheated using external heat exchange devices, then the primary fuel temperature increases, but the system complexity and installation space requirements increase
Solution Approach 1:
The patent combines the heat exchange function with the existing recirculation line by extending the primary fuel line through the recirculation line's heat exchange volume. This integration eliminates the need for separate external heat exchange devices, reducing system complexity while achieving effective primary fuel preheating through thermal coupling between the hot secondary fuel and primary fuel lines
Solution Approach 2:
The primary fuel line is nested within the recirculation line's heat exchange volume, allowing the primary fuel to be preheated by the hot secondary fuel flowing through the recirculation line. This nested configuration enables space-efficient heat transfer without requiring additional external heat exchange equipment
2Productivity
If high pressure is applied to the primary fuel flow, then recirculation rate increases, but pressure loss in the anode path increases
Solution Approach 1:
The primary fuel is preheated before entering the anode section through the heat exchange volume, which prepares the fuel for more efficient combustion and reduces the energy penalty associated with high-pressure recirculation. This preliminary heating action compensates for the energy loss in the recirculation process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables efficient preheating of the primary fuel at high pressure, reducing pressure loss and optimizing the heat exchange process within a compact installation space.
Implementation Method 1
At least sections of the primary fuel line extend through a heat exchange volume within the recirculation line for a heat-transmitting connection between the secondary fuel and the primary fuel
Data Source
AI summary
The invention relates to a fuel cell system (10) comprising at least one fuel cell stack (11) having an anode section (12) and a cathode section (13), an ejector (14), a fuel mixture line (15) for conveying a fuel mixture—containing primary fuel and secondary fuel—from the ejector (14) to the anode section (12), a primary fuel line (16) for supplying the primary fuel to the ejector (14), and a recirculation line (17) for returning the secondary fuel from the anode section (16) to the ejector (14), wherein at least sections of the primary fuel line (16) extend through a heat exchange volume (18) within the recirculation line (17) for a heat-transmitting connection between the secondary fuel and the primary fuel.