Hydrogen compression system
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Solution Overview
Problem
Hydrogen compression using thermochemical methods faces high electric power consumption and reduced energy efficiency due to the need for a separate electric heat source to heat the metal hydride material.
Innovation Solution
A hydrogen compression system utilizing a heat pump part with a refrigerant as a heat source to heat and cool the hydrogen compression part, eliminating the need for a separate electric heat source and allowing continuous hydrogen compression without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a separate electric heat source is used to heat the metal hydride material for hydrogen compression, then the compression function is achieved, but electric power consumption increases and energy efficiency decreases
Solution Approach 1:
The patent combines the heating function into the heat pump system by integrating a heat storage tank that stores thermal energy from the heat pump's refrigerant. This merging eliminates the need for a separate electric heat source, reducing electric power consumption while maintaining the hydrogen compression function through coordinated operation of the heat pump, heat storage tank, and metal hydride compressor.
Solution Approach 2:
The system uses the refrigerant from the heat pump itself as the heat source for heating the metal hydride material. The refrigerant absorbs heat during compression and releases it during expansion, creating a self-sustaining thermal cycle that serves the heating requirement without external electric input, thereby improving energy efficiency.
2Device complexity
If a mechanical compressor is used to compress hydrogen, then compression is achieved, but the structure becomes complex and hydrogen purity is reduced due to lubricating oil contamination
Solution Approach 1:
The patent replaces the mechanical compressor system with a thermochemical compressor based on metal hydride. This substitution eliminates mechanical moving parts, pistons, and lubricating oil, thereby simplifying the structure while maintaining high hydrogen purity. The compression is achieved through chemical reactions (hydrogen absorption and desorption) rather than mechanical compression.
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
This approach significantly minimizes electric power consumption and improves energy efficiency by up to 50% compared to traditional methods, enabling continuous high-pressure hydrogen extraction.
Implementation Method 1
a separate electric heat source (e.g., an electric heater) needs to be provided, and the metal hydride material needs to be heated by heat transferred from the electric heat source to the metal hydride material by conduction
Implementation Method 2
the metal hydride material needs to be heated by heat transferred from the electric heat source to the metal hydride material by conduction
Implementation Method 3
a process of repeatedly heating and cooling a metal hydride material by using characteristics of the metal hydride material. An equilibrium pressure of a reaction for making metal hydride by storing hydrogen in metal varies depending on the composition and temperature of the material
Implementation Method 4
a heat pump part including a heat pump line configured to allow a refrigerant to circulate therethrough
Data Source
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AI summary
A hydrogen compression system includes: a heat pump part including a heat pump line configured to allow a refrigerant to circulate therethrough, a hydrogen compression part configured to compress hydrogen by being repeatedly heated and cooled, a first circulation line connected to the heat pump line while passing through the hydrogen compression part and configured to allow the refrigerant introduced from the heat pump line to circulate therethrough, a second circulation line provided to pass through the hydrogen compression part and configured to allow a cooling fluid to circulate therethrough, and a cooling unit provided in the second circulation line and configured to cool the cooling fluid, in which the hydrogen compression part is heated by the refrigerant or cooled by the cooling fluid, thereby minimizing electric power consumption and improving energy efficiency.