Ammonia Injection Nozzle Tip Cooling for Nitriding Prevention
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Solution Overview
Problem
The tip portion of ammonia injection nozzles in burners is prone to nitriding due to exposure to high-temperature atmospheres, leading to a reduction in toughness and potential combustion instability.
Innovation Solution
A combustion device with an ammonia injection nozzle featuring an adjustment structure that controls the temperature of the tip portion, including mechanisms to adjust ammonia flow rate, separation distance, injection port opening area, and air flow rate, to maintain the tip portion temperature below a nitriding threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ammonia injection nozzle tip portion is exposed to high-temperature atmosphere for flame formation, then combustion performance is improved, but nitriding of the tip portion occurs leading to reduced toughness
Solution Approach 1:
The patent introduces a cooling gas flow (inert atmosphere) through the cooling gas injection nozzle to create a protective environment around the ammonia injection nozzle tip portion. This cooling gas flow displaces the high-temperature combustion atmosphere from direct contact with the tip portion, preventing nitriding while maintaining combustion performance. The cooling gas acts as an inert barrier between the reactive hot atmosphere and the vulnerable nozzle tip.
Solution Approach 2:
The cooling gas injection nozzle serves as an intermediary device between the high-temperature combustion zone and the ammonia injection nozzle tip portion. By introducing cooling gas through this intermediary nozzle, the system mediates the interaction between hot gases and the nozzle tip, reducing thermal exposure and preventing direct nitriding while allowing combustion to proceed effectively.
2Strength
If cooling measures are applied to suppress nitriding, then toughness is maintained, but device complexity increases
Solution Approach 1:
The patent segments the injection system into functionally distinct components: the ammonia injection nozzle for fuel delivery and the separate cooling gas injection nozzle for protective cooling. This segmentation allows each component to be optimized for its specific function while working together to solve the nitriding problem. The cooling function is separated from the fuel injection function, enabling independent control and optimization of each subsystem.
Solution Approach 2:
The cooling gas injection nozzle serves multiple functions: it cools the ammonia injection nozzle tip portion to prevent nitriding, creates a protective inert atmosphere barrier, and potentially stabilizes the combustion process. By designing a single cooling gas injection nozzle that performs these multiple functions simultaneously, the patent reduces overall system complexity compared to having separate systems for each function.
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
Effectively suppresses nitriding of the ammonia injection nozzle, maintaining its toughness and stability, thereby reducing the frequency of repairs and ensuring consistent combustion performance.
Implementation Method 1
a cooling gas injection nozzle that introduces cooling gas into the combustion device
Implementation Method 2
ammonia is injected from an injection port provided at a tip portion of the ammonia injection nozzle, and thus flame is formed in front of the burner
Data Source
AI summary
A combustion device includes: a burner including an ammonia injection nozzle having a tip portion provided with an injection port facing an internal space of a furnace; an adjustment structure that adjusts a temperature of the tip portion; anda control device that controls an operation of the adjustment structure so that the temperature of the tip portion is equal to or lower than a reference temperature.