Fuel Supply Module Bypass Pipe for Entrainment Ratio Control
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Solution Overview
Problem
Conventional fuel supply modules for fuel cell systems face challenges in maintaining a constant entrainment ratio under load fluctuations, leading to inefficient hydrogen generation and increased CO production, due to the use of expensive air blowers and ejectors that are difficult to control.
Innovation Solution
A fuel supply module with a mixer and a bypass pipe system that adjusts the water vapor and fuel flow rates using a steam pump and valve to maintain a constant entrainment ratio, ensuring stable reforming reactions by controlling the ratio of fuel to water vapor supply even under varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an air blower is used to supply fuel, then fuel can be supplied quickly and constantly, but the system cost increases and control difficulty increases
Solution Approach 1:
The patent removes the air blower from the system entirely and replaces it with a fuel injection system that uses the existing water vapor flow to atomize and supply fuel. This extracts the problematic component while maintaining the essential function of rapid fuel supply through a simpler mechanism.
Solution Approach 2:
The fuel injection system utilizes the kinetic energy of the water vapor flow itself to atomize and transport the fuel, rather than requiring an external air blower. The water vapor flow serves dual purposes: as the reforming reactant and as the fuel delivery medium, making the system self-sufficient.
2Ease of manufacture
If an ejector is used to mix water vapor and fuel, then mixing occurs before the reformer, but the entrainment ratio increases with load leading to inefficient reforming
Solution Approach 1:
The patent implements a dynamic fuel injection system where the fuel injection rate is actively adjusted based on the load conditions. The control unit modifies the fuel injection amount in response to changing water vapor flow rates, maintaining an optimal entrainment ratio across varying loads rather than allowing it to increase passively with load as in the ejector system.
Solution Approach 2:
The system incorporates a control unit that monitors the operating conditions and adjusts the fuel injection rate accordingly. This feedback mechanism ensures the entrainment ratio remains within the optimal range (2-3) regardless of load variations, preventing the inefficiency that occurs when the ratio becomes too high.
3Reliability
If separate supply lines are used for water vapor and fuel, then constant entrainment ratio can be maintained, but additional mixing space is required in the reformer
Solution Approach 1:
The patent combines the fuel injection and water vapor supply functions into a single integrated system. The fuel is injected directly into the water vapor stream, and the water vapor serves as both the reforming reactant and the fuel delivery medium. This merging eliminates the need for separate supply lines and reduces the required reformer volume while maintaining reliable entrainment ratio control through active injection management.
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 solution effectively maintains the reformer efficiency and stability by regulating the entrainment ratio within a predefined range, preventing inefficiencies and ensuring consistent hydrogen production even during load variations in the fuel cell system.
Implementation Method 1
a steam pump for supplying water vapor to the mixer in a state of being vaporized
Implementation Method 2
a mixer for mixing the water vapor and the fuel together
Implementation Method 3
an ejector having a first inlet connected to the water vapor supply line, a second inlet connected to the fuel supply line, and an outlet through which a mixture of the water vapor and fuel is discharged
Implementation Method 4
a reformer for reforming hydrocarbon fuels such as LNG, coal gas and methanol to hydrogen using water vapor
Data Source
AI summary
Disclosed are a fuel supply module that may maintain an entrainment ratio in a constant range even under a load change, and a fuel reforming apparatus for a fuel cell using the same. The fuel supply module includes: a water vapor storage for storing water vapor therein; a fuel storage for storing fuel therein; a mixer having a first inlet, a second inlet, and an outlet; a first inlet pipe for connecting the water vapor storage and the first inlet of the mixer with each other; a second inlet pipe for connecting the fuel storage and the second inlet of the mixer with each other; an outlet pipe connected to the outlet of the mixer; and a bypass pipe having one end connected to the first inlet pipe and the other end connected to the outlet pipe.