Thermal Hydrogen Compression with a Continuous Carrier Loop
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Solution Overview
Problem
Existing hydrogen compression methods require high mechanical power due to low density and incompressibility, leading to significant parasitic costs and inefficiencies, especially for high-pressure applications like vehicle fuel storage, and lack continuous thermal compression solutions.
Innovation Solution
A continuous thermal hydrogen compression system using a closed loop sorbent flow circuit with hydrogenation and dehydrogenation modules, employing a hydrogen carrier that exhibits incompressible behavior, and utilizing thermal energy to absorb and desorb hydrogen, with optional integration of heat pumps and mechanical compressors for flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If mechanical compression is used to compress hydrogen gas, then hydrogen can be pressurized to required levels, but the power requirements become excessively high due to low hydrogen density
Solution Approach 1:
The patent replaces mechanical compression systems with a thermal compression system. Instead of using mechanical compressors to directly compress hydrogen gas, the system uses temperature cycling to control hydrogen absorption and desorption from a carrier material. The hydrogen is absorbed at low temperature and low pressure, then released at high temperature and high pressure, eliminating the need for high-power mechanical compressors.
Solution Approach 2:
The patent utilizes phase transitions of hydrogen between absorbed state (in carrier material) and gaseous state. By cycling the carrier material between absorbed and desorbed states through temperature control, the system achieves pressure elevation without mechanical compression. The phase change from absorbed to gaseous hydrogen naturally produces the pressure increase needed.
2Stress or pressure
If mechanical compression is used for hydrogen, then high pressure can be achieved, but sealing problems and lubricant contamination occur
Solution Approach 1:
The patent replaces mechanical compression equipment with thermal compression using a carrier material system. This eliminates mechanical seals, bearings, and lubricants that are prone to hydrogen embrittlement and contamination. The thermal compression process uses temperature cycling rather than mechanical force, removing the reliability issues associated with mechanical sealing in hydrogen service.
3Temperature
If cyclic adsorption with stationary beds is used, then thermal compression can be achieved, but the flow rate cannot be easily modified and the system is not truly continuous
Solution Approach 1:
The patent transitions from static stationary beds to a dynamic flowing carrier material system. The carrier material continuously circulates through absorption and desorption zones, enabling true continuous operation. The flow rate can be easily adjusted by controlling the circulation rate of the carrier material, providing dynamic flexibility that stationary beds cannot achieve.
Solution Approach 2:
The patent implements continuous operation by having the carrier material continuously cycle between absorption and desorption zones. Multiple stages can operate in sequence, ensuring that while one stage is absorbing hydrogen, another is desorbing it, maintaining continuous hydrogen production. This eliminates the intermittent operation inherent in cyclic stationary bed systems.
4Stress or pressure
If high-grade mechanical energy is used for compression, then hydrogen can be pressurized, but the energy efficiency is low compared to using lower-grade thermal energy
Solution Approach 1:
The patent substitutes mechanical energy input with thermal energy input for the compression process. Instead of using high-grade mechanical energy from electric motors driving compressors, the system uses lower-grade thermal energy to drive the absorption-desorption cycles of the carrier material. This matches the energy grade to the task, improving overall energy efficiency.
Solution Approach 2:
The patent changes the energy input parameter from mechanical to thermal. By controlling temperature rather than applying mechanical force, the system achieves pressure elevation through thermodynamic parameter changes in the carrier material. This allows the use of lower-grade thermal energy sources that would be inefficient for direct 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
Reduces mechanical compression power requirements, enables flexible flow rate adjustment, integrates well with liquid fuels infrastructure, and utilizes lower-grade thermal energy sources, enhancing efficiency and reducing operational costs and emissions.
Implementation Method 1
a hydrogenation module that accepts a hydrogen gas stream at a first pressure to be absorbed or adsorbed to a lean carrier stream through heat removal
Implementation Method 2
a hydrogenation module that accepts a hydrogen gas stream at a first pressure to be absorbed or adsorbed to a lean carrier stream through heat removal
Implementation Method 3
a pump connected to an output of the hydrogenation module and configured to increase a pressure of the rich carrier stream to produce a pressurized rich carrier stream
Implementation Method 4
a dehydrogenation module configured to separate, via an addition of heat, a pressurized hydrogen gas stream from the pressurized rich carrier stream
Data Source
AI summary
A continuous thermal hydrogen compression system, and methods of thermally compressing hydrogen, are disclosed. A hydrogenation module accepts a hydrogen gas stream to be absorbed or adsorbed to a lean carrier stream through heat removal, thereby producing a heat output and a rich carrier stream containing absorbed or adsorbed hydrogen. A pump, connected to an output of the hydrogenation module, increases the pressure of the rich carrier stream to produce a pressurized rich carrier stream. A dehydrogenation module separates, via an addition of heat, a pressurized hydrogen gas stream from the pressurized rich carrier stream to produce a lean carrier stream. A pressure reducing device reduces the pressure of the lean carrier stream before it is returned to the hydrogenation module. The carrier stream is cycled continuously between the hydrogenation module and the dehydrogenation module.