Alkaline Electrolysis Piston Mechanism for Gas Pressurization
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Solution Overview
Problem
Conventional alkaline water electrolysis systems face challenges with pressurization and crossover of hydrogen and oxygen gases, particularly at low loads, and require separate compression equipment for hydrogen storage.
Innovation Solution
An alkaline water electrolysis system with interlocking reaction chambers, pistons, and a power source device that alternates polarity, along with gas valves and pressure sensors to separate and store hydrogen and oxygen without external compression, using a simple configuration and low-cost equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separation membrane is used in conventional alkaline water electrolysis systems, then hydrogen and oxygen are physically separated, but pressurization becomes difficult and crossover occurs at low loads
Solution Approach 1:
The patent removes the separation membrane from the electrolysis cell, extracting the problematic component that caused both crossover and pressurization difficulties. The system achieves gas separation through spatial separation of electrode compartments rather than through a membrane barrier, eliminating the membrane-related issues while maintaining effective gas separation.
Solution Approach 2:
The piston mechanism serves multiple functions simultaneously: it pressurizes the generated gases, drives the electrolyte circulation, and controls the timing of gas discharge. This multi-functionality replaces what would otherwise require separate membrane-based separation and compression systems, simplifying the overall device architecture.
2Stress or pressure
If separate compression equipment is used for hydrogen storage, then hydrogen can be stored at required pressure, but device complexity and equipment cost increase
Solution Approach 1:
The patent merges the compression function into the electrolysis cell itself by using the piston mechanism that is already present for electrolyte management. The piston pressurizes the hydrogen during the electrolysis process, combining gas generation and compression into a single integrated system, thereby eliminating the need for separate compression equipment.
Solution Approach 2:
The electrolysis system performs its own compression operation through the piston mechanism, making the system self-sufficient. The generated hydrogen is pressurized by the same mechanical action that drives the electrolysis process, allowing the system to serve its own compression needs without external equipment.
3Adaptability or versatility
If polarity is reversed in separation-type alkaline water electrolysis system, then operation direction reverses, but hydrogen and oxygen may mix without separation membrane
Solution Approach 1:
The electrolysis cell is divided into distinct compartments for hydrogen generation and oxygen generation, separated by physical barriers and fluid dynamics rather than a continuous membrane. This segmentation maintains gas separation integrity even when polarity reverses, as each compartment remains physically distinct and gases are discharged through separate pathways controlled by the piston timing.
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 efficient pressurization and storage of hydrogen and oxygen without separate compression equipment, reducing the risk of gas mixing and improving operational efficiency.
Implementation Method 1
a power source device configured to generate hydrogen and oxygen by applying electrical energy to main electrodes
Implementation Method 2
a piston provided in each reaction chamber to change the volume of the reaction chamber through reciprocating motion
Implementation Method 3
a connecting rod and a crankshaft installed to change the rotational motion of the drive motor into reciprocating linear motion of the piston
Implementation Method 4
a pressure sensor installed in the reaction chamber
Data Source
AI summary
An alkaline water electrolysis system includes: a plurality of reaction chambers, each including a main electrode and an auxiliary electrode; a piston provided in each reaction chamber to change a volume of the reaction chamber through reciprocating motion; a drive motor; a connecting rod and a crankshaft installed to change rotational motion of the drive motor into reciprocating linear motion of the piston; a plurality of gas valves installed on an upper side of the reaction chamber to discharge hydrogen and oxygen generated in the reaction chamber through different paths, respectively; a pressure sensor installed in the reaction chamber; a controller configured to open and close the gas valves in response to a signal received from the pressure sensor; and an electrolyte supply apparatus provided to supply an electrolyte to the reaction chambers.