Hydrogen Electrolyzer Pressure Control With Reciprocating Compression
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Solution Overview
Problem
Fluctuating power supply from renewable energy sources to electrolysis units leads to pressure fluctuations at the outlet, negatively affecting the durability and lifespan of electrolysis units.
Innovation Solution
A reciprocating compressor with an automatic suction valve, lifting gripper, and electrically controllable actuator, controlled by a control unit to maintain a predetermined output pressure or differential pressure across the electrolysis unit, even with fluctuating power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrolysis unit is directly connected to renewable energy sources with fluctuating power supply, then the use of renewable energy is enabled, but pressure fluctuations occur at the electrolysis unit outlet affecting durability
Solution Approach 1:
A buffer vessel is introduced as an intermediary component between the electrolysis unit and the hydrogen storage system. This buffer vessel absorbs pressure fluctuations from the electrolysis unit outlet, preventing direct transmission of pressure variations to the storage system and thereby protecting the electrolysis unit from durability issues while maintaining connection to renewable energy sources
2Reliability
If the output pressure of the electrolysis unit is maintained constant, then the durability is improved, but the ability to utilize fluctuating renewable energy is reduced
Solution Approach 1:
The system maintains constant pressure only at the outlet of the electrolysis unit where it is most needed for durability, while allowing pressure variations in the hydrogen storage system to accommodate fluctuating energy supply. The buffer vessel enables this partial pressure stabilization by decoupling the pressure requirements of different system components
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
Ensures a constant output pressure or differential pressure, enhancing the durability and longevity of the electrolysis unit by stabilizing the hydrogen production process despite variable energy input.
Implementation Method 1
Electrolysis is a known method for producing hydrogen. In this process, water is split into hydrogen (H2) and oxygen (O2) using electrical energy.
Implementation Method 2
providing a reciprocating compressor for compressing the hydrogen produced by the electrolysis unit
Data Source
Figure 1
AI summary
In order to provide a device (1) for providing hydrogen (H2) by means of an electrolysis unit (2) which allows the longest possible service life of the electrolysis unit (2) even in case of fluctuating energy supplies to the electrolysis unit (2), a reciprocating piston compressor (3) is provided to compress the hydrogen (H2) generated by the electrolysis unit (2), the reciprocating piston compressor (3) having at least one automatic intake valve (5). A retraction gripper (6) is provided in order to hold the intake valve (5) selectively in an open position, an electrically actuatable actuator (7) is provided to activate the retraction gripper (6), and a control unit (4) is provided to control the actuator (7), the control unit (4) being designed to actuate the actuator (7) in such a way that an outlet pressure (p1) of the hydrogen (H2) at the outlet of the electrolysis unit (2), or a differential pressure (Δp) between an anode and a cathode of the electrolysis unit (2), is adjustable to a predefined target value (p1_soll, Δp_soll).