Removable Start-Up Module for High-Temperature Fuel Cell Systems
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Solution Overview
Problem
High-temperature fuel-cell systems, such as solid oxide fuel-cells, require initial heating to operational temperatures (600° C. to 1000° C.), which is time-consuming and poses challenges in preventing anode oxidation during start-up, as the reforming reaction is endothermic at low temperatures.
Innovation Solution
A fuel-cell system with a removable start-up module containing a second reformer capable of exothermic reactions, supplying hydrogen-containing fuel to the fuel-cell stacks until they reach a predetermined temperature (300° C. to 500° C.), thereby preventing anode oxidation and reducing system volume and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a steam reformer is used for reforming hydrocarbon fuel via an endothermic reaction, then hydrogen can be produced for the fuel-cell stacks, but the anode chamber cannot be made into the reducing atmosphere during initial low-temperature operation
Solution Approach 1:
The system is divided into two separate reformer units: a first reformer for normal hydrogen production and a second reformer specifically for start-up operations. This segmentation allows each reformer to be optimized for its specific function, with the second reformer dedicated to creating reducing atmosphere during initial heating when the fuel-cell stacks are below operational temperature.
Solution Approach 2:
The second reformer acts as an intermediary system during the transition period from cold start to operational temperature. It provides the necessary hydrogen and reducing atmosphere conditions that the main system cannot provide at low temperatures, bridging the gap until the fuel-cell stacks reach their operational temperature range.
2Temperature
If the fuel-cell system is heated to operational temperature (600° C. to 1000° C.) from initial state, then electric energy generation is enabled, but the heating process requires several hours and risks anode oxidation
Solution Approach 1:
The second reformer is activated during the preliminary heating stage to provide hydrogen to the anode chamber before the fuel-cell stacks reach operational temperature. This preliminary action of supplying hydrogen during cold start prevents anode oxidation and enables faster warm-up without compromising component integrity.
Solution Approach 2:
The system changes operational parameters by switching between two different reforming configurations: using the second reformer for low-temperature start-up operations and transitioning to the first reformer for normal high-temperature operation. This parameter change allows the system to optimize performance for each operational phase.
3Productivity
If a second reformer is added to the system for low-temperature hydrogen production, then start-up performance is improved, but system volume and complexity increase
Solution Approach 1:
The reformer system is segmented into two independent units with distinct functions. The second reformer is a compact unit specifically designed for start-up operations, allowing it to be smaller and more specialized than a full-scale reformer, thus minimizing the volume increase while maintaining improved start-up performance.
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
The solution allows for efficient start-up of high-temperature fuel-cell systems by preventing anode oxidation, reducing system volume and manufacturing costs, and improving heat dissipation efficiency by using a separate start-up module with a second reformer that can reform fuel at low temperatures.
Implementation Method 1
the second reformer may include one selected from a group consisting of a steam reformer, a partial oxidation reformer, a catalytic partial oxidation reformer, and an auto-thermal reformer
Implementation Method 2
A fuel cell, which generates electricity via an electrochemical reaction between hydrogen and oxygen
Implementation Method 3
a first reformer for converting at least some of hydrocarbon fuel into hydrogen
Data Source
AI summary
A fuel-cell system is disclosed. The fuel cell system includes: a system module having one or more fuel-cell stacks, a first reformer for converting at least some of hydrocarbon fuel into hydrogen, and supplying the hydrogen to the fuel-cell stacks, and a housing for receiving the fuel-cell stacks, and the first reformer therein; and a start-up module disposed outside the housing, and removably coupled to the system module, wherein the start-up module supplies hydrogen-containing fuel to the fuel-cell stacks until a temperature of the fuel-cell stack reaches a predetermined temperature.