High-Temperature Alkaline Electrolyzer Control for Lower Hydrogen Cost
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrogen production methods, particularly through natural gas reforming, emit air pollutants contributing to global warming, and existing electrolyzers, despite high electrical efficiency, are expensive due to high capital and operational costs, limiting their adoption in industrial applications.
Innovation Solution
A high-temperature alkaline electrolyzer system that operates above 100 degrees Celsius, utilizing thermal insulation and a diaphragm with specific materials, combined with pulsed current delivery and cost-based control systems to optimize efficiency and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If natural gas reforming is used for hydrogen production, then production cost is low, but air pollutants are emitted contributing to global warming
Solution Approach 1:
The patent changes the operating temperature parameter to above 100 degrees Celsius, which fundamentally alters the electrochemical reactions in the electrolyzer. This temperature increase improves efficiency and reduces the levelized cost of hydrogen, making the clean hydrogen production method economically competitive while eliminating air pollutant emissions associated with natural gas reforming
2Ease of manufacture
If conventional electrolyzers are used for hydrogen production, then electrical efficiency is high, but capital and operational costs are expensive
Solution Approach 1:
The patent applies parameter changes by operating the electrolyzer at temperatures above 100 degrees Celsius, which fundamentally alters the electrochemical kinetics and reduces electrical efficiency requirements. This temperature parameter change enables cost-effective hydrogen production by reducing both capital and operational costs while maintaining acceptable efficiency levels
Solution Approach 2:
The patent implements pulsed current delivery to the electrolyzer cells, applying periodic electrical action rather than continuous current. This pulsed operation mode optimizes the electrochemical reactions, reduces parasitic losses, and improves overall system efficiency, contributing to lower operational costs while maintaining high hydrogen production rates
3Ease of manufacture
If electrolyzer operation is optimized for efficiency, then hydrogen production cost decreases, but system complexity increases
Solution Approach 1:
The patent uses pulsed current delivery with specific duty cycles and frequencies to optimize electrolyzer performance. This periodic electrical action simplifies control requirements compared to continuous complex control systems, while achieving cost-effective hydrogen production through optimized electrochemical reactions during the pulsed operation cycles
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 achieves lower hydrogen production costs by improving efficiency, reducing parasitic losses, and dynamically adjusting operations to minimize costs, offering a substantial savings compared to conventional electrolyzers.
Implementation Method 1
use power from the power input to produce a first stream comprising oxygen gas and a second stream comprising hydrogen gas from an alkaline solution through electrolysis
Implementation Method 2
thermal insulation at least partially covering the electrolyzer cell
Implementation Method 3
induce a pulsed current between the cathode and the anode of the electrolyzer cell that varies based on a control signal
Data Source
AI summary
Conventional control schemes for electrolyzers focus on maximizing electrical efficiency, which describes the relationship between the electrical energy consumed and the gas produced by the electrolyzer. However, the cost associated with high electrical efficiency may be unnecessarily expensive. In one embodiment presented herein, a model is used to determine the cost (or profit) associated with a gas produced by the electrolyzer at each of a plurality of operating conditions. The control system can select the operating condition to use based on which operating condition is associated with the lowest cost (or highest profit), even though that operating condition may not be associated with the highest electrical efficiency.