Two-Stage Fuel Cell Layout for Higher Fuel Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fuel cell power generation systems face challenges in achieving both high fuel utilization rates and high thermal efficiency, particularly with oxide-ion-conducting SOFCs, which operate at high temperatures and have limited material options, and proton-conducting fuel cells that lack thermal efficiency compared to oxide-ion-conducting SOFCs.
Innovation Solution
A fuel cell power generation system comprising an oxide-ion-conducting first fuel cell and a proton-conducting second fuel cell, where the oxide-ion-conducting fuel cell operates at high temperatures and has a low fuel utilization rate, while the proton-conducting fuel cell operates at lower temperatures with a high fuel utilization rate, arranged in a multi-stage configuration to enhance overall fuel utilization and power generation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If oxide-ion-conducting SOFCs are used to achieve high thermal efficiency, then power generation efficiency is improved, but fuel utilization rate decreases and material selection is limited due to high operating temperatures
Solution Approach 1:
The fuel cell system is divided into two separate units: an oxide-ion-conducting fuel cell for high-temperature power generation and a proton-conducting fuel cell for low-temperature power generation. This segmentation allows each unit to operate optimally at different temperatures, with the oxide-ion unit achieving high thermal efficiency and the proton-conducting unit achieving high fuel utilization rate, thereby resolving the contradiction between power generation efficiency and fuel utilization rate
Solution Approach 2:
The invention changes the operating temperature parameter by introducing a proton-conducting fuel cell that operates at lower temperatures (equal to or lower than 600°C) compared to the oxide-ion-conducting fuel cell. This parameter change expands material selection flexibility and improves fuel utilization rate while maintaining overall high power generation efficiency through the combined system
2Use of energy by moving object
If oxide-ion-conducting SOFCs operate at high temperatures to achieve high thermal efficiency, then power generation efficiency is improved, but material selection is limited
Solution Approach 1:
The system is segmented into high-temperature and low-temperature fuel cell units, allowing different material systems to be used in each unit. The oxide-ion-conducting unit uses high-temperature compatible materials for high thermal efficiency, while the proton-conducting unit uses low-temperature compatible materials for broader material selection flexibility
Solution Approach 2:
By changing the operating temperature parameter through the introduction of proton-conducting fuel cells, the invention enables material selection flexibility. The low-temperature operation of the proton-conducting unit expands the range of usable materials compared to traditional high-temperature oxide-ion-conducting systems
3Adaptability or versatility
If proton-conducting fuel cells are used to achieve lower operating temperatures, then material selection flexibility is improved, but thermal efficiency decreases compared to oxide-ion-conducting SOFCs
Solution Approach 1:
The invention merges oxide-ion-conducting and proton-conducting fuel cell units into a single hybrid system. The oxide-ion unit provides high thermal efficiency at high temperatures, while the proton-conducting unit provides material flexibility at lower temperatures. Together, they achieve both high thermal efficiency and material selection flexibility that neither unit could achieve alone
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 for a higher fuel utilization rate and increased power generation efficiency by leveraging the strengths of both types of fuel cells, with the oxide-ion-conducting fuel cell providing hydrogen-rich gases to the proton-conducting fuel cell, optimizing both fuel utilization and power output.
Implementation Method 1
oxide-ion-conducting first fuel cell that performs reformation of a fuel containing hydrocarbon and power generation
Implementation Method 2
performs reformation of a fuel containing hydrocarbon
Implementation Method 3
proton-conducting second fuel cell that performs power generation by being supplied with hydrogen from the first fuel cell
Implementation Method 4
performs power generation by causing chemical reactions between hydrocarbon and oxygen
Data Source
AI summary
An object of the present invention is to provide a fuel cell power generation system that can attain a higher fuel utilization rate and can also attain higher power generation efficiency simultaneously. The fuel cell power generation system includes an oxide-ion-conducting first fuel cell 11 that performs reformation of a fuel containing hydrocarbon and power generation and a proton-conducting second fuel cell 12 that performs power generation by being supplied with hydrogen from the first fuel cell 11. The fuel utilization rate of the first fuel cell 11 can be set to 30% or lower, for example, and the fuel utilization rate of the second fuel cell 12 can be set to 70% or higher, for example. By adopting such a multi-stage configuration, it is possible to increase the power generation efficiency as a whole and to also attain a high fuel utilization rate simultaneously.