Ammonia Supply Piping With Nickel Alloy Nitridation Control
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Solution Overview
Problem
Hydrocarbon-based fossil fuels are finite and emit carbon, leading to climate change, while existing ammonia systems suffer from corrosion issues that reduce hydrogen production efficiency and stability.
Innovation Solution
An ammonia supply system using nickel-based alloys with controlled temperature zones and specific nitridation resistance, combined with hydrogen circulation and mixing ratios, to prevent corrosion and enhance energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in high-temperature ammonia supply lines, then initial cost is lower, but corrosion resistance and reliability deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the nitrided layer depth (T≤15 μm) and composition ratio (5-15 at% Cr, 5-15 at% Mo) of the nickel-based alloy to achieve optimal corrosion resistance at high temperatures. This quantitative parameter control resolves the contradiction between reliability and manufacturability.
Solution Approach 2:
The patent uses composite materials by creating a nitrided layer on the nickel-based alloy surface with specific chromium and molybdenum content. This composite structure (nickel-based alloy substrate + nitrided surface layer) provides enhanced corrosion resistance while maintaining the base material's manufacturability.
2Productivity
If temperature is increased to improve hydrogen production efficiency, then reaction rate increases, but material corrosion accelerates
Solution Approach 1:
The patent changes the material parameter by using a nickel-based alloy with controlled nitrided layer depth (T≤15 μm) and specific alloying elements (Cr: 5-15 at%, Mo: 5-15 at%), enabling the system to operate at high temperatures (410-800°C) for improved hydrogen production while resisting corrosion.
Solution Approach 2:
The patent converts the harmful effect of high temperature (which accelerates corrosion) into a benefit by using the high temperature to form a protective nitrided layer on the nickel-based alloy surface. This nitrided layer, with controlled depth and composition, actually protects the material from further corrosion while allowing high-temperature operation for efficient hydrogen production.
3Reliability
If nickel-based alloy with low nitrided depth is used, then corrosion resistance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the nitrided layer: depth T≤15 μm, Cr content 5-15 at%, and Mo content 5-15 at%. These well-defined parameter ranges make the manufacturing process controllable and repeatable, resolving the contradiction between achieving low nitrided depth for corrosion resistance and maintaining reasonable manufacturing precision requirements.
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 stabilizes hydrogen production and supply, ensuring uniform quality and reducing performance degradation, enabling efficient carbon-free power generation and fuel cell operations.
Implementation Method 1
the second pipe may include a nickel-based alloy (NT) satisfying Equation 1 below: T≤15 μm
Data Source
AI summary
Disclosed are an ammonia supply system, a hydrogen production system, a carbon-free power generation system and a fuel cell system. The ammonia supply system includes an ammonia supply unit; an ammonia demand unit; a connection line that connects the ammonia supply unit and the ammonia demand unit; a hydrogen supply unit; and one or more first hydrogen supply lines that connect the hydrogen supply unit and the connection line, and are configured to supply a hydrogen gas stream, wherein the connection line includes a first pipe controlled to an average temperature of 410° C. or lower and a second pipe controlled to an average temperature of greater than 410° C., and the second pipe includes a nickel-based alloy (NT) satisfying Equation 1 below.T≤15 µmEquation 1