Metal Hydride Compressor Variable Pressure Control
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Solution Overview
Problem
Existing metal hydride compressors operate at fixed compression ratios, unable to produce variable output pressures, limiting their application in scenarios requiring adjustable hydrogen compression.
Innovation Solution
A control method for metal hydride compressors that regulates output pressure by maintaining a metal hydride at a constant temperature within the α+β phase, allowing for variable pressure output by adjusting the heating temperature and using PID or MIMO control to maintain constant pressure during desorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metal hydride compressors operate at fixed compression ratios, then the device structure is simple, but the adaptability to different pressure requirements is poor
Solution Approach 1:
The patent applies dynamics by making the compression ratio variable rather than fixed. The system dynamically adjusts the output pressure by controlling the heating temperature of the metal hydride, allowing the compressor to adapt to different pressure requirements. The control system modifies operational parameters in real-time to achieve variable compression ratios.
Solution Approach 2:
The patent changes the physical parameter of temperature to control the output pressure. By adjusting the heating temperature of the metal hydride, the system changes the desorption characteristics and achieves variable compression ratios. This parameter change approach allows continuous adjustment of output pressure without mechanical modifications.
2Productivity
If multiple compression modules are operated simultaneously, then the productivity is improved, but the device complexity and heat management difficulty increase
Solution Approach 1:
The patent uses periodic action by operating compression modules in alternating cycles rather than simultaneously. One module absorbs hydrogen while another desorbs, and they switch roles periodically. This approach maintains continuous hydrogen output while simplifying the system compared to running all modules simultaneously, as each module can be optimized for its specific phase of operation.
3Reliability
If excessive heat is permanently removed from the heat sink side, then the temperature control is simplified, but the energy efficiency decreases
Solution Approach 1:
The patent implements feedback control by using temperature sensors to monitor the metal hydride temperature and adjusting the heating power accordingly. The control system receives temperature feedback and modulates the heating element to maintain the desired temperature profile, ensuring reliable temperature control while minimizing energy waste through precise control rather than permanent heat removal.
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
Enables the generation of variable output pressures in metal hydride compressors, enhancing their versatility for applications such as laboratory, industrial, and hydrogen energy storage systems by allowing adjustable compression ratios.
Implementation Method 1
Metal hydrides are commonly used for the storage of hydrogen under low pressures as many metals and alloys are capable of reversibly absorbing large amounts of hydrogen. Molecular hydrogen is dissociated at the surface before absorption and two H atoms recombine to H2 upon the desorption process.
Implementation Method 2
Molecular hydrogen is dissociated at the surface before absorption and two H atoms recombine to H2 upon the desorption process.
Implementation Method 3
At the desired plateau temperature, heat is supplied to the metal hydride to start the desorption process and release gaseous hydrogen at the desired pressure.
Implementation Method 4
Inside the α+β phase, the pressure varies exponentially with the temperature.
Data Source
AI summary
The present relates to a Metal hydride compressor control method for generating a variable output pressure P_desired_outPut, comprising a first step of inflowing gaseous hydrogen into a metal hydride compartment at a constant temperature and then stopping the gaseous hydrogen inflow, a second step of heating the metal hydride to a predetermined temperature which corresponds to a temperature which passes through the α+β phase at the desired output pressure P_desired_output, a third step of opening the output connection of the compressor and keeping it at a constant pressure by regulating the temperature to keep a constant output pressure P_desired_outPut until the system completely leaves the α+β phase.