Multilayer Hydrogen Tank Liner Using Polyamide and Composite Reinforcement
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Solution Overview
Problem
Current hydrogen tanks face challenges such as low thermal resistance, high permeability to hydrogen, and limited operating temperature range, which hinder efficient hydrogen storage and distribution, especially in high-pressure applications.
Innovation Solution
A multilayer structure comprising a sealing layer with short-chain or long-chain semi-crystalline polyamide thermoplastic polymers and a composite reinforcement layer impregnated with epoxy resin, which enhances mechanical strength and reduces hydrogen permeability, allowing for increased operating temperatures and filling speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If HDPE is used as the liner material, then the manufacturing process is simple and cost-effective, but the thermal resistance is insufficient and hydrogen permeability is too high
Solution Approach 1:
The patent employs a composite liner structure consisting of multiple layers with distinct functions: an inner polyamide layer for hydrogen barrier properties, an intermediate adhesive layer for bonding, and an outer polyethylene layer for impact resistance and chemical resistance. This composite approach allows each layer to contribute its specific advantages, achieving both thermal resistance and manufacturing feasibility that single-material solutions cannot provide.
2Ease of manufacture
If HDPE is used as the liner material, then the manufacturing process is simple and cost-effective, but the hydrogen permeability is too high
Solution Approach 1:
The patent employs a composite liner structure consisting of multiple layers with distinct functions: an inner polyamide layer for hydrogen barrier properties, an intermediate adhesive layer for bonding, and an outer polyethylene layer for impact resistance and chemical resistance. This composite approach allows each layer to contribute its specific advantages, achieving both thermal resistance and manufacturing feasibility that single-material solutions cannot provide.
Solution Approach 2:
The patent applies different materials to different regions of the liner structure based on local requirements: the inner layer contacts hydrogen and requires low permeability (polyamide), the intermediate layer requires adhesion (adhesive), and the outer layer requires mechanical and chemical resistance (polyethylene). This localized material assignment optimizes performance for each specific function while maintaining overall manufacturing efficiency.
3Temperature
If PA6 is used as the liner material, then the thermal resistance is improved, but the resistance to cold is insufficient
Solution Approach 1:
The patent employs a composite liner structure consisting of multiple layers with distinct functions: an inner polyamide layer for hydrogen barrier properties, an intermediate adhesive layer for bonding, and an outer polyethylene layer for impact resistance and chemical resistance. This composite approach allows each layer to contribute its specific advantages, achieving both thermal resistance and manufacturing feasibility that single-material solutions cannot provide.
4Productivity
If the filling speed is increased to match fuel tank refilling times, then the operating efficiency is improved, but the thermal resistance is exceeded due to heating
Solution Approach 1:
The patent employs a composite liner structure consisting of multiple layers with distinct functions: an inner polyamide layer for hydrogen barrier properties, an intermediate adhesive layer for bonding, and an outer polyethylene layer for impact resistance and chemical resistance. This composite approach allows each layer to contribute its specific advantages, achieving both thermal resistance and manufacturing feasibility that single-material solutions cannot provide.
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 multilayer structure effectively reduces hydrogen permeability and increases the maximum usable temperature to 120°C, improving the efficiency and safety of hydrogen storage and distribution systems.
Implementation Method 1
Low permeability to hydrogen, indeed, the permeability of the liner is a key factor in limiting hydrogen losses from the tank
Implementation Method 2
a structural layer made of fiber impregnated with thermoset resin surrounding said liner
Data Source
AI summary
A multilayer structure for transporting, distributing and storing hydrogen including, from the inside to the outside, a sealing layer and at least one composite reinforcement layer, the sealing layer including from the inside to the outside: a layer of a composition including: a short-chain polyamide thermoplastic polymer, more than 15% and up to 50% by weight of impact modifier, or including: a semi-crystalline long-chain polyamide thermoplastic polymer, up to 50% by weight of impact modifier, up to 3% by weight of plasticizer; a hydrogen barrier layer; a layer of a composition including: a short-chain polyamide thermoplastic polymer, more than 15% and up to 50% by weight of impact modifier, or including: a semi-crystalline long-chain polyamide thermoplastic polymer, up to 50% by weight of impact modifier, up to 3% of weight of plasticizer, the innermost composite reinforcement layer being wound around the sealing layer.