Ammonia Cracker Bypass Control for Load-Fluctuation Hydrogen Conversion
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Solution Overview
Problem
In mobility environments such as ships or dump trucks, load fluctuations cause a decrease in ammonia decomposition ratio and hydrogen conversion, leading to increased residual ammonia due to incomplete reactions.
Innovation Solution
A system for decomposing ammonia that includes a cracker, a heater, a fuel cell, a bypass line, a sensor, and a controller. The controller adjusts the operation of the bypass line based on the internal temperature and residual ammonia levels in the cracker, optimizing the ammonia decomposition reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ammonia decomposition reaction is directly applied from plant environment to mobility environment with feedback logic, then system complexity is reduced, but ammonia decomposition ratio is lowered
Solution Approach 1:
The patent adjusts operational parameters (temperature, pressure, flow rates) of the ammonia decomposition system to adapt from plant-scale to mobility environment. The controller dynamically modifies these parameters based on load conditions to maintain high decomposition ratio while simplifying the control structure for mobile applications.
Solution Approach 2:
The system implements dynamic control of the ammonia decomposition process, where the controller continuously adjusts operational parameters based on real-time load conditions. This dynamic adaptation allows the system to maintain high decomposition efficiency across varying mobility environments without requiring complex plant-scale feedback logic.
2Productivity
If endothermic reaction occurs at relatively low temperature during load follow operation, then ammonia can be decomposed, but hydrogen conversion ratio is lowered and residual ammonia increases
Solution Approach 1:
The system performs preliminary heating of the ammonia feed before it enters the decomposition reactor. This pre-heating action ensures that the ammonia reaches the optimal temperature range for decomposition, thereby improving hydrogen conversion ratio and reducing residual ammonia even during load follow operations with limited thermal energy available.
Solution Approach 2:
The controller dynamically adjusts the temperature parameter of the endothermic reaction based on load conditions. By optimizing the temperature parameter within the available thermal energy range, the system maintains high hydrogen conversion ratio and minimizes residual ammonia while still achieving effective ammonia decomposition during load follow operation.
3Quantity of substance
If large amount of ammonia is introduced during load follow operation, then ammonia decomposition demand is met, but inner temperature of cracker is rapidly lowered
Solution Approach 1:
The system introduces preliminary heating measures before large amounts of ammonia are fed into the cracker. This pre-heating action prevents rapid temperature drop in the cracker while still allowing large ammonia quantities to be processed, thereby maintaining decomposition efficiency during load follow operations.
Solution Approach 2:
The system implements beforehand cushioning by pre-heating the ammonia feed and/or the cracker bed before introducing large amounts of ammonia during load follow operation. This cushioning measure buffers against the rapid temperature drop that would otherwise occur, maintaining stable decomposition conditions even when processing large ammonia quantities.
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 improves ammonia decomposition efficiency by promoting the ammonia decomposition reaction, reducing residual ammonia, and maintaining system power and battery performance even under load fluctuations.
Implementation Method 1
A process of decomposing ammonia to produce hydrogen is an endothermic reaction that requires a lot of heat
Implementation Method 2
a heater heating the cracker
Implementation Method 3
a fuel cell reacting at least portion of the hydrogen generated by the cracker to generate power
Data Source
AI summary
A system for decomposing ammonia includes a cracker decomposing ammonia to generate hydrogen, a heater heating the cracker, a fuel cell reacting hydrogen to supply a power in a battery, a bypass line connecting a pipe that connects the cracker and the fuel cell with a pipe connecting the fuel cell and the heater, a sensor for sensing an internal temperature of the cracker, and a controller for receiving an internal temperature information of the cracker from the sensor. The controller is configured to receive a residual ammonia information in the cracker, and to control an operation of the bypass line based on at least one of the internal temperature information and the residual ammonia information.