Hydrogen Thermal Compression Using Cold-Gas Heating in a Closed Tank
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Solution Overview
Problem
Existing hydrogen compressing technologies struggle to achieve high-purity, high-pressure hydrogen efficiently, with common compressors risking contamination or performance issues, and existing methods have low efficiency (3-5%) in fueling stations.
Innovation Solution
A hydrogen compressing system comprising three units: a first unit for compression, a second unit for cooling, and a third unit for heating, where hydrogen is compressed at low temperature and low pressure, then heated in a fluidly isolated tank to achieve high pressure without reducing purity, using a heat-based compression method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If reciprocating compressors are used to compress hydrogen at high pressure, then compression capability is improved, but hydrogen purity deteriorates due to lubrication oil contamination
Solution Approach 1:
The patent replaces the mechanical compression system (reciprocating compressor with moving parts requiring lubrication) with a thermal compression system. By heating the hydrogen gas in a closed tank, the pressure increases according to the ideal gas law (PV=nRT), achieving high pressure without mechanical contact and thus without oil contamination, maintaining hydrogen purity above 99.997%.
Solution Approach 2:
The patent changes the physical parameter approach from mechanical force application to thermal energy application. By controlling the temperature parameter (heating the hydrogen from ambient temperature to elevated temperatures), the pressure parameter is indirectly controlled and increased to the desired high pressure levels without the need for mechanical compression components that would contaminate the hydrogen.
2Manufacturing precision
If diaphragm compressors are used to maintain hydrogen purity, then hydrogen purity is improved, but flow capability and efficiency deteriorate
Solution Approach 1:
The patent replaces the diaphragm compressor's mechanical action with a thermal process. Instead of using a flexible diaphragm to mechanically compress the hydrogen (which limits flow rate and efficiency), the system uses heating to increase pressure. This thermal approach removes flow restrictions and efficiency limitations inherent in diaphragm compressor mechanics while maintaining purity through the absence of contamination risks.
3Power
If common compressor technology is used to compress hydrogen, then compression is achieved, but system complexity and contamination risk increase
Solution Approach 1:
The patent replaces complex mechanical compression systems with a simple thermal compression process. The system consists essentially of a tank and a heating source, eliminating the need for compressors, motors, seals, lubrication systems, and associated control mechanisms. This drastic simplification reduces device complexity while maintaining the compression function through the fundamental thermodynamic relationship between temperature and pressure.
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 effectively produces high-pressure hydrogen at ambient temperature with purity above 99.997%, reducing tank size and ensuring efficient vehicle operation without contamination, using a simple and efficient heating-based compression process.
Implementation Method 1
pressurization at the third unit is achieved by introducing cold hydrogen gas, well below ambient temperature, received from the second unit into the tank and heating it while the tank is fluidly isolated preferably till when the hydrogen inside the tank reaches ambient temperature
Implementation Method 2
a second unit to cool down the hydrogen received from the first unit
Data Source
AI summary
The hydrogen compressing system has a first unit that receives hydrogen at low temperature and low pressure and compresses it, a second unit that cools down the hydrogen received from the first unit and a third unit that heats up and pressurizes the hydrogen received from the second unit; the high-pressure hydrogen is stored in a tank and afterwards may be supplied, for example, to a tank of a vehicle; pressurization at the third unit (300) is achieved by introducing cold hydrogen gas, well below ambient temperature, received from the second unit into the tank and heating it while the tank is closed preferably till when the hydrogen inside the tank reaches ambient temperature; heating-based compression allows to easily obtain high pressure through a relatively simple system and without risk of reducing the purity of the hydrogen.