Fuel Cell Module Convection Flow Control
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Solution Overview
Problem
The challenge in fuel cell modules is to effectively control the temperature of cell stacks within the optimal range of 700° C. to 1000° C. without causing damage, while minimizing power consumption and manufacturing costs, as existing methods require large heat exchangers or risk electrical issues with heat recovery units.
Innovation Solution
A fuel cell module with a pressure vessel, insulation board, and convection flow rate adjusting devices that control gas flow rates between inner and outer spaces to maintain optimal temperatures, using dampers and flow passages to adjust gas flow rates and prevent radiant heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large-size heat exchanger is used to adjust the temperature of air supplied to the fuel cell module, then the temperature control range is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the cooling function into two independent parts: (1) the gas turbine compressor that provides initial cooling through compression, and (2) a small heat exchanger that provides fine-tuning adjustment. This segmentation allows the system to achieve wide temperature control range without requiring a single large heat exchanger, thus reducing device complexity and manufacturing cost while maintaining effective temperature control
Solution Approach 2:
The patent introduces the gas turbine compressor as an intermediary component that performs preliminary cooling of the air before it reaches the fuel cell module. This intermediary cooling action reduces the temperature burden on the subsequent small heat exchanger, enabling the system to achieve wide temperature adjustment range with a compact heat exchanger design
2Temperature
If heat recovery units are installed in the vicinity of electrical conduction parts for cooling, then the cooling efficiency is improved, but the risk of electrical leakage and damage increases
Solution Approach 1:
The patent extracts the heat recovery unit from the vicinity of electrical conduction parts and relocates it to a position where it cools the air stream before it enters the fuel cell module. This spatial separation eliminates the risk of electrical leakage and damage to cell stacks while maintaining cooling efficiency through the air cooling pathway
Solution Approach 2:
The patent uses the air stream as an intermediary medium to transfer heat away from the fuel cell module. Instead of directly contacting electrical components, the heat recovery unit cools the air that then passes over the cell stacks, providing indirect cooling that eliminates electrical leakage risks while maintaining thermal management effectiveness
3Temperature
If the flow rate of fuel and air is controlled to adjust temperature, then the temperature control precision is improved, but the power consumption and blower capacity increase
Solution Approach 1:
The patent implements a feedback control system that monitors the temperature of the power generation section and automatically adjusts the flow rates of fuel and air accordingly. This feedback mechanism enables precise temperature control while optimizing blower operation to minimize power consumption, as the system only increases blower capacity when temperature deviations require correction
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 solution allows precise temperature control of cell stacks, reducing temperature distribution and power generation variations, enabling efficient power generation without the need for large heat exchangers or additional cooling facilities, thus lowering costs and preventing damage.
Implementation Method 1
A lower flow passage which connects a lower portion of the outer space on a side vertically lower than the plurality of cell stacks to a lower portion of the inner space on a side vertically lower than the plurality of cell stacks, and an upper flow passage which connects an upper portion of the outer space on a side vertically higher than the plurality of cell stacks to an upper portion of the inner space on a side vertically higher than the plurality of cell stacks are formed in the insulation board
Data Source
AI summary
A fuel cell includes a cell side insulation (2) separating an internal space of a pressure vessel (205) into an outer space (5) and an inner space (6), a plurality of cell stacks (101) disposed in the inner space, and a lower damper (11-i). In the cell side insulation, a plurality of lower flow passages (7) which connect a lower portion of the outer space to a lower portion of the inner space and a plurality of upper flow passages (8) which connect an upper portion of the outer space to an upper portion of the inner space are formed. The lower damper adjusts a flow rate of a gas that flows toward the inner space from the outer space via the plurality of lower flow passages and flows toward the outer space from the inner space via the plurality of upper flow passages.