Fuel Cell Moisture Control via Membrane Separation
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Solution Overview
Problem
Existing fuel cell systems face issues with moisture management, leading to reduced reforming efficiency and fuel cell degradation due to excessive moisture supply, and insufficient steam during load variations, which affects electric power generation.
Innovation Solution
A fuel cell system with a moisture quantity adjustment device and feedback control unit that separates and adjusts moisture in the fuel gas to ensure appropriate moisture levels, using a steam reforming type reformer and a combination of steam and partial oxidization reforming, with a non-organic separation membrane and feedback channels to recycle moisture, preventing carbon precipitation and maintaining reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large quantity of moisture is supplied to the reformer to prevent reduction in reforming efficiency and degradation of catalytic reforming material, then reforming efficiency is maintained, but a large quantity of extra water is generated that causes fuel cell body degradation and reduced reaction efficiency
Solution Approach 1:
The invention extracts and removes excess moisture from the fuel gas stream using a moisture separation device positioned between the reformer and fuel cell body. This separation process removes the harmful excess water while preserving the necessary moisture for reforming efficiency, preventing fuel cell degradation without sacrificing reforming performance
Solution Approach 2:
The invention implements a feedback control system that monitors moisture content in the fuel gas and adjusts the moisture supply to the reformer accordingly. The control unit receives signals about the moisture content and regulates the moisture supply to maintain optimal levels, preventing both excessive moisture accumulation and insufficient moisture for reforming
2Object-generated harmful factors
If moisture supply is reduced to avoid excessive water generation and fuel cell degradation, then water management is improved, but steam becomes insufficient during load variations causing reduced reaction efficiency
Solution Approach 1:
The invention employs dynamic control of moisture supply through the feedback control system that continuously adjusts moisture input based on operating conditions and load variations. The moisture separation device also dynamically adjusts the degree of moisture removal to maintain optimal moisture levels across different operating scenarios, ensuring reaction efficiency is maintained during load transitions
Solution Approach 2:
The invention changes the moisture content parameter of the fuel gas by selectively removing excess moisture while preserving adequate steam levels. The system dynamically adjusts the moisture parameter based on load conditions, maintaining the moisture content within an optimal range that prevents degradation while ensuring sufficient steam for high-temperature reforming reactions during load variations
3Ease of operation
If moisture is not adjusted during load variations from low to high output power, then system operation is simple, but steam quantity becomes insufficient causing reduced reaction efficiency
Solution Approach 1:
The feedback control unit automatically detects load variations and adjusts moisture supply and separation accordingly, eliminating the need for manual intervention while maintaining reaction efficiency. The system self-regulates based on operating conditions, keeping the operation simple yet effective
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 system effectively responds to load variations, maintains reaction efficiency, and improves fuel utilization and thermal efficiency by ensuring optimal moisture supply, achieving self-sufficiency in moisture and reducing thermal energy loss.
Implementation Method 1
a steam reforming type reformer (20) and a combination of steam and partial oxidization reforming
Implementation Method 2
a steam reforming type reformer (20) and a combination of steam and partial oxidization reforming
Implementation Method 3
using a non-organic separation membrane
Implementation Method 4
caused to flow and contact on respective electrodes to perform electric power generation
Data Source
AI summary
Disclosed is a fuel cell system comprising a reformer and a fuel cell body to which a fuel gas reformed through the reformer and air are supplied and in which the supplied fuel gas and air are separated from each other and caused to flow and contact on respective electrodes to perform electric power generation. A moisture quantity adjustment device is configured to adjustably separate a portion of moisture included in the fuel gas supplied from the reformer in order for the moisture included in the fuel gas to be supplied to the fuel cell body in an appropriate quantity.