Fuel Cell Coolant Heater Prevents Membrane Freezing
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Solution Overview
Problem
Conventional fuel cells face issues with water freezing on the proton exchange membrane during shutdown, leading to membrane destruction, and inefficient cold start-up processes.
Innovation Solution
A fuel cell system comprising a cooling circuit with temperature and pressure sensors, a heater, and a solenoid valve, controlled by a controller, which heats the coolant to prevent freezing and manage hydraulic pressure, allowing for efficient start-up and operation while reducing water on the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel cell is shut down without heating, then energy consumption is reduced, but the water on the proton exchange membrane freezes and destroys the membrane
Solution Approach 1:
The controller activates the heater before shutting down the fuel cell to preheat the coolant and prevent water freezing on the proton exchange membrane. This preliminary heating action ensures the membrane is protected from freeze damage during shutdown, resolving the contradiction between membrane protection and energy consumption by performing the necessary heating in advance rather than continuously.
2Productivity
If the heater is activated during cold start-up, then the start-up time is shortened, but energy consumption increases
Solution Approach 1:
The heater is activated during cold start-up to preheat the coolant before the fuel cell begins operation, which shortens the overall start-up time. The controller manages the heater operation to provide just enough heating to enable rapid start-up, then shuts it down, thus achieving faster productivity while controlling energy consumption to only what is necessary for the start-up phase.
3Temperature
If the cooling circuit continuously circulates coolant, then temperature control is improved, but hydraulic pressure increases and may cause leaks
Solution Approach 1:
The water pump operates in different modes based on system conditions: during normal operation it maintains coolant circulation for temperature control, but during shutdown or cold start-up it can be deactivated or operated at reduced speed. This dynamic operation allows the system to maintain good temperature control when needed while reducing hydraulic pressure when continuous circulation is not necessary, preventing leaks.
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 prevents proton exchange membrane damage by heating the coolant during cold start-ups, shortening start-up time, improving efficiency, and managing hydraulic pressure to protect the membrane.
Implementation Method 1
the heater heats the coolant in the cooling circuit, which increases the coolant temperature
Implementation Method 2
The cooling circuit is configured to cool the electrochemical reactor
Implementation Method 3
the radiator comprises a third water inlet and a third water outlet
Implementation Method 4
the pressure sensor is disposed in the cooling circuit to sense a hydraulic pressure of a coolant in the cooling circuit
Implementation Method 5
the first temperature sensor and the second temperature sensor are configured to detect and transmit temperature data of a coolant in the cooling pipe to the controller
Data Source
AI summary
A method for controlling a fuel cell that includes an electrochemical reactor; a cooling circuit; a controller; a coolant circuit; a first temperature sensor; and a second temperature sensor. The cooling circuit includes a cooling pipe and is configured to cool the electrochemical reactor; the controller is configured to control operations of the electrochemical reactor and the cooling circuit; the cooling pipe includes a first water inlet and a first water outlet; and the coolant circuit is connected to the first water inlet and the first water outlet. The method includes comparing the first temperature of the coolant at the first water inlet to the second temperature at the first water outlet; and controlling operations of the heater and the electrochemical reactor based on the comparison result.