SOFC Hydrodesulfurizer Temperature Control via Anode Off-Gas Distribution
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Solution Overview
Problem
Solid oxide fuel cell (SOFC) systems face instability in hydrodesulfurization when the composition of the raw material gas changes, leading to suboptimal operation of the desulfurizer due to variations in reforming energy and thermal energy, affecting the catalyst's temperature and performance.
Innovation Solution
The system adjusts the distribution of anode off-gas between the combustor and desulfurizer, and controls the air supply to maintain the desulfurization catalyst within the optimal temperature range by adjusting the air/fuel ratio and anode off-gas distribution based on temperature feedback, ensuring consistent thermal energy and catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the composition of raw material gas changes, then the reforming energy and thermal energy vary, but the hydrodesulfurizer cannot maintain stable operation
Solution Approach 1:
The patent implements a feedback control system where the temperature of the desulfurization catalyst is continuously monitored, and based on this temperature feedback, the air supply amount to the reformer is automatically adjusted. This closed-loop control enables the system to adapt to changes in raw material gas composition while maintaining stable catalyst temperature and reliable hydrodesulfurization operation.
Solution Approach 2:
The patent changes the air supply parameter to the reformer based on detected catalyst temperature and raw material gas composition. By dynamically adjusting the air/fuel ratio and air supply amount, the system compensates for variations in reforming energy caused by different gas compositions, thereby maintaining stable thermal energy for hydrodesulfurization.
2Reliability
If the air supply to reformer is increased to maintain thermal energy, then the catalyst temperature is stabilized, but the energy consumption increases
Solution Approach 1:
The feedback control system adjusts the air supply amount based on actual catalyst temperature detection and raw material gas composition analysis. This prevents excessive air supply and energy consumption by only increasing air flow when necessary to maintain optimal catalyst temperature, rather than using fixed high air supply rates.
Solution Approach 2:
The air supply rate is made dynamic rather than fixed, allowing the system to adapt the air/fuel ratio according to real-time operating conditions including gas composition and catalyst temperature. This dynamic adjustment optimizes energy utilization by supplying air only at the minimum necessary amount to maintain stable catalyst operation.
3Productivity
If the air/fuel ratio is adjusted to control catalyst temperature, then the desulfurization efficiency is maintained, but the system complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism that automatically adjusts the air supply based on catalyst temperature detection. This automated feedback loop maintains desulfurization efficiency without requiring complex manual control systems or multiple independent control devices, as the temperature sensor and controller work together as an integrated control system.
Solution Approach 2:
The control system performs self-adjustment based on temperature feedback, automatically modifying the air/fuel ratio to maintain optimal catalyst temperature. This self-regulating capability maintains high desulfurization efficiency without requiring external intervention or complex control architecture, as the system serves itself through automated temperature-based air supply adjustment.
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 allows the hydrodesulfurizer to operate stably even with changes in raw material gas composition, maintaining desulfurization efficiency and extending catalyst life by keeping the desulfurization catalyst within the optimal temperature range.
Implementation Method 1
a reformer (14) configured to generate a reformed gas from a raw material gas and water that are supplied to the reformer
Implementation Method 2
a fuel cell (11) configured to generate electric power through a power-generating reaction by utilizing the fuel gas and air
Implementation Method 3
a combustor (17) configured to combust an anode off gas, the anode off gas being the fuel gas that has not been utilized in the fuel cell
Implementation Method 4
a desulfurizer (20) configured to remove a sulfur component from the raw material gas supplied thereto by hydrodesulfurization
Implementation Method 5
a casing part housing at least the reformer, the fuel cell, and the combustor, which are covered with a heat insulating material
Data Source
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AI summary
A fuel cell system includes: a reformer (14) configured to generate a fuel gas from a raw material gas, reforming water, and air that are supplied to the reformer (14); an SOFC (11) configured to generate electric power through a power-generating reaction by utilizing the fuel gas and air; a combustor (17) configured to combust an anode off gas discharged from the SOFC (1); a hot module (10) housing the reformer (14), the SOFC (11), and the combustor (17), which are covered with a heat insulating material; and a hydrodesulfurizer (20) configured to remove a sulfur component from the raw material gas by hydrodesulfurization. The anode off gas is supplied to the combustor (17) and the hydrodesulfurizer (20) in a distributed manner. The hydrodesulfurizer (20) performs the hydrodesulfurization of the raw material gas by utilizing the anode off gas as a hydrogen source and utilizing an exhaust gas discharged from the hot module (10) as a heat source, the exhaust gas containing at least combustion heat from the combustor (17).