Ammonia Engine Startup Catalyst Warmup Sequence
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Solution Overview
Problem
The reforming reaction in the reforming catalyst of an ammonia engine does not occur until it reaches a temperature at which reforming is possible during startup, leading to ammonia discharge without consumption.
Innovation Solution
A controller initiates a combustion process to generate combustion gas in a combustor, followed by a supplying process that supplies ammonia and air to the reforming catalyst after the combustion process has begun, ensuring the catalyst is warmed up before reforming occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the supplying process is initiated at the startup of the ammonia engine, then the reforming catalyst can be supplied with ammonia, but the reforming reaction does not occur until the catalyst reaches a certain temperature, causing ammonia to be discharged without being consumed
Solution Approach 1:
The combustor is activated first to generate combustion gas that warms up the reforming catalyst before the supplying process is initiated. This preliminary heating action ensures the catalyst reaches the necessary temperature for reforming to occur, preventing ammonia discharge without consumption while maintaining efficient startup timing
Solution Approach 2:
The controller dynamically adjusts the startup sequence by initiating the combustion process before the supplying process, creating a coordinated timing mechanism that optimizes both temperature preparation and ammonia supply to eliminate waste discharge
2Productivity
If the reforming catalyst is supplied with ammonia at startup, then the catalyst can process ammonia, but the reforming reaction cannot occur until the catalyst reaches a specific temperature
Solution Approach 1:
The combustor generates combustion gas that is used to pre-heat the reforming catalyst before ammonia supply begins. This preliminary thermal preparation ensures the catalyst reaches the required operating temperature, enabling immediate and efficient ammonia conversion without temperature-related delays
Solution Approach 2:
Combustion gas acts as an intermediary medium to transfer thermal energy from the combustor to the reforming catalyst. This intermediary heating mechanism efficiently raises the catalyst temperature to the level needed for effective ammonia reforming
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
Reduces the volume of ammonia discharged from the reforming catalyst by shortening the time before the catalyst reaches a reforming temperature, thereby enhancing the efficiency of the ammonia engine startup.
Implementation Method 1
a combustor configured to generate combustion gas by burning ammonia mixed with air
Implementation Method 2
a reforming catalyst configured to be warmed up by the combustion gas
Implementation Method 3
a reforming catalyst configured to be warmed up by the combustion gas, an ammonia engine configured to be supplied with hydrogen that is discharged from the reforming catalyst
Data Source
AI summary
An ammonia engine system includes a combustor configured to generate combustion gas by burning ammonia mixed with air, a reforming catalyst configured to be warmed up by the combustion gas, an ammonia engine configured to be supplied with hydrogen that is discharged from the reforming catalyst, and a controller. The controller is configured to, during startup of the ammonia engine, execute a combustion process that causes the combustor to generate the combustion gas and a supplying process that supplies the reforming catalyst with ammonia together with air. The controller is configured to initiate the supplying process after the combustion process has begun.