Metal-Carbon Dioxide Battery for High-Capacity CO2 Processing
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Solution Overview
Problem
Conventional hydrogen generation and carbon dioxide storage systems have limited processing capacity for carbon dioxide and produce less alkali bicarbonate compared to the proposed system.
Innovation Solution
The system includes a metal-carbon dioxide battery with an anode, cathode, and ion exchange membrane, along with supply units for electrolytes, a separation unit for hydrogen and circulating liquid, an electrolyte circulation unit, a dissolution unit for carbon dioxide, and a filtration unit to produce alkali bicarbonate. Additionally, a carbon dioxide purification unit is used to increase carbon dioxide processing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional zinc/aluminum-based aqueous battery system is used for hydrogen generation and carbon dioxide capture, then the system is economical in terms of price and reserves, but the processing capacity for carbon dioxide is limited and alkali bicarbonate production is low
Solution Approach 1:
The system is divided into distinct functional modules: a metal-carbon dioxide battery unit for electrochemical reactions, a separation unit for hydrogen gas extraction, an electrolyte circulation unit for electrolyte management, a dissolution unit for carbon dioxide absorption, and a filtration unit for alkali bicarbonate production. Each module performs a specific function, allowing the system to process larger quantities of carbon dioxide while maintaining operational efficiency.
Solution Approach 2:
The electrolyte circulation unit serves multiple functions: it circulates electrolyte between the battery and dissolution unit, stores electrolyte, and facilitates carbon dioxide absorption. The filtration unit simultaneously filters the electrolyte and produces alkali bicarbonate as a valuable byproduct. This multi-functionality increases carbon dioxide processing capacity without proportionally increasing system complexity.
2Productivity
If the system processes more carbon dioxide, then alkali bicarbonate production increases, but the system complexity increases due to additional units
Solution Approach 1:
The filtration unit combines two functions: filtering the electrolyte to remove impurities and concentrating alkali bicarbonate from the filtered electrolyte. The electrolyte circulation unit merges electrolyte pumping, storage, and carbon dioxide absorption functions into a single integrated system. This merging allows increased alkali bicarbonate production while minimizing the increase in system complexity.
Solution Approach 2:
The electrolyte is pre-filtered in the filtration unit before being returned to the battery, preventing impurity accumulation that would reduce productivity. The electrolyte circulation unit pre-absorbs carbon dioxide in the dissolution unit before the electrolyte enters the battery, optimizing the electrochemical reactions and increasing overall alkali bicarbonate production efficiency.
3Productivity
If a carbon dioxide purification unit is added to increase processing capacity, then the system becomes more complex, but carbon dioxide processing efficiency improves
Solution Approach 1:
The dissolution unit acts as an intermediary between the carbon dioxide source and the battery system. It absorbs carbon dioxide from the atmosphere or external sources into the electrolyte, converting gaseous carbon dioxide into dissolved carbon dioxide that can be efficiently processed by the battery. This intermediary function increases carbon dioxide processing capacity while integrating smoothly with the existing system architecture.
Solution Approach 2:
The electrolyte circulation unit automatically absorbs carbon dioxide from the atmosphere through the dissolution unit without requiring external intervention. The system uses its own electrolyte to capture and process carbon dioxide, converting waste carbon dioxide into valuable alkali bicarbonate while maintaining continuous operation. This self-service capability increases processing capacity without requiring additional complex control systems.
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 higher carbon dioxide processing capacity and greater production of alkali bicarbonate compared to conventional systems, with low carbon dioxide discharge and efficient hydrogen generation.
Implementation Method 1
electrochemical water electrolysis has been actively studied in line with the development of renewable energy sources to combat climate change
Implementation Method 2
an ion exchange membrane interposed between the anode and the cathode
Implementation Method 3
a dissolution unit located at a rear end of the electrolyte circulation unit, wherein the dissolution unit being configured to dissolve carbon dioxide in a starting material received from the electrolyte circulation unit
Implementation Method 4
a filtration unit located between the second supply unit and the dissolution unit, wherein the filtration unit being configured to precipitate and separate alkali bicarbonate from the electrolyte precursor solution
Data Source
AI summary
A hydrogen generation and carbon dioxide storage system has increased processing capacity of carbon dioxide. The system includes a metal-carbon dioxide battery comprising an anode, a cathode, and an ion exchange membrane positioned between the anode and the cathode, a first supply unit configured to provide a first electrolyte to the anode, a second supply unit configured to provide a second electrolyte comprising hydrogen ions and an aqueous solution of alkali bicarbonate to the cathode, a separation unit, an electrolyte circulation unit located at a rear end of the separation unit, a dissolution unit located at a rear end of the electrolyte circulation unit, and a carbon dioxide purification unit.