Fuel Cell CO Concentration Control via Partial Oxidation Reformer
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Solution Overview
Problem
Fuel cells face carbon deposition issues due to high CO concentrations in the fuel gas produced by partial oxidation reformers, which can lead to performance degradation.
Innovation Solution
A fuel cell system with a CO sensor, mixing ratio adjusting unit, and control unit that sets and maintains a target CO concentration in the fuel gas, adjusting the raw fuel and air mixing ratio to suppress CO levels, thereby preventing carbon deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the raw fuel is subjected to partial oxidation reforming to produce fuel gas, then the fuel gas can be supplied to the fuel cell for power generation, but the CO concentration in the fuel gas becomes high causing carbon deposition in the fuel cell
Solution Approach 1:
The patent changes the concentration parameter of CO in the fuel gas by controlling the mixing ratio of raw fuel and air in the partial oxidation reformer. By adjusting this parameter, the CO concentration is maintained below a specific threshold value, preventing carbon deposition while ensuring sufficient fuel supply for power generation.
Solution Approach 2:
The patent implements a feedback control mechanism where a CO sensor detects the actual CO concentration in the fuel gas, and this information is fed back to the control unit. The control unit then adjusts the mixing ratio adjusting unit to maintain the CO concentration within the desired range, dynamically preventing carbon deposition.
2Object-affected harmful factors
If the CO concentration in the fuel gas is reduced to prevent carbon deposition, then carbon deposition is suppressed, but the fuel gas composition must be precisely controlled
Solution Approach 1:
The patent employs a feedback control system comprising a CO sensor that continuously monitors CO concentration and a control unit that adjusts the mixing ratio based on the detected values. This closed-loop feedback mechanism automatically maintains CO concentration within the safe range without requiring complex manual intervention or overly complicated control logic.
Solution Approach 2:
The control system performs self-adjustment by using the CO sensor data to automatically modify the mixing ratio through the mixing ratio adjusting unit. The system serves itself by detecting deviations and correcting them without external intervention, simplifying the overall control architecture while ensuring effective carbon deposition prevention.
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
Effectively suppresses carbon deposition in fuel cells by accurately controlling CO concentrations in the fuel gas, ensuring efficient and reliable operation.
Implementation Method 1
a partial oxidation reformer that reforms a raw fuel into a fuel gas by subjecting the raw fuel to partial oxidation reforming
Implementation Method 2
a fuel cell that generates electric power by an electrochemical reaction of the fuel gas produced in the partial oxidation reformer and an oxygen-containing gas
Implementation Method 3
a CO sensor configured to detect a CO concentration in the fuel gas produced in the partial oxidation reformer and introduced into the fuel cell
Data Source
AI summary
A fuel cell system includes: a partial oxidation reformer; a fuel cell stack; a CO sensor configured to detect a CO concentration in a fuel gas produced in the partial oxidation reformer and introduced into the fuel cell stack; a mixing ratio adjusting unit configured to adjust a mixing ratio of a raw fuel and air supplied to the partial oxidation reformer; a target CO concentration setting unit configured to set a target CO concentration in the fuel gas introduced into the fuel cell stack; and a mixing control unit configured to control operation of the mixing ratio adjusting unit such that the CO concentration detected by the CO sensor becomes the target CO concentration.