Calcium Composition CO2 Fixation and Drying
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Solution Overview
Problem
Existing methods for fixing CO2 in calcium-containing products require water, leading to unpredictable water content, which complicates their use in concrete production and requires separate drying processes, resulting in energy consumption and CO2 emission.
Innovation Solution
A method and apparatus that simultaneously fix CO2 and dry a calcium-containing composition using a CO2-containing gas, reducing water content to less than 5 mass% while promoting efficient carbonation, using a fluidized bed reactor with controlled CO2 concentration and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is added to promote CO2 fixation reaction, then CO2 fixation efficiency is improved, but water content in the product increases making it difficult to control and predict
Solution Approach 1:
The patent combines the CO2 fixation reaction and drying processes into a single integrated operation. The CO2-containing gas serves dual purposes: facilitating the carbonation reaction and simultaneously drying the calcium-containing composition. This merging eliminates the need for separate drying steps and allows precise control of water content while maintaining high CO2 fixation efficiency.
Solution Approach 2:
The patent changes the physical state and concentration parameters of the CO2-containing gas during the process. By controlling the temperature (20-300°C) and CO2 concentration (1-100 volume%) of the gas, the process achieves both efficient carbonation and effective drying. The gas parameters are adjusted to optimize both reaction efficiency and water removal.
2Manufacturing precision
If separate drying process is added to remove water, then water content is reduced, but energy consumption increases and CO2 emission increases
Solution Approach 1:
The CO2-containing gas, which is already part of the carbonation process, serves the additional function of drying the calcium-containing composition. The gas utilizes its own thermal energy and CO2 concentration to remove water from the product during the same operational sequence. This self-service approach eliminates the need for separate energy-intensive drying equipment and processes.
Solution Approach 2:
The CO2-containing gas performs multiple functions simultaneously: it acts as a reactant for CO2 fixation and as a drying medium to remove water from the calcium-containing composition. This multi-functionality eliminates the need for separate drying apparatus and reduces overall energy consumption while maintaining precise water content control.
3Manufacturing precision
If separate drying apparatus is added to remove water, then water content is reduced, but process complexity increases
Solution Approach 1:
The patent merges the CO2 fixation reaction zone and drying zone into a single reactor system. The same apparatus where carbonation occurs also serves as the drying chamber, eliminating the need for separate drying equipment. This integration simplifies the overall process while maintaining precise control over water content in the final product.
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
Achieves a calcium-containing product with low water content and sufficient CO2 fixation without significant CO2 emission, enabling flexible use in concrete production while simplifying the process and reducing energy requirements.
Implementation Method 1
CO2 is fixed by the reaction of calcium hydroxide formed during cement hydration and CO2 to calcium carbonate
Implementation Method 2
fixing CO2 to the calcium-containing composition and simultaneously drying the calcium-containing composition by making the calcium-containing composition and the water flow in the reactor by the CO2-containing gas supplied
Implementation Method 3
the calcium components react with water and change into calcium hydroxide which reacts easily with CO2 to form calcium carbonate
Data Source
AI summary
A calcium-containing composition with fixed CO2 is produced by contacting a mixture of a calcium-containing composition before CO2 fixation and water with a CO2-containing gas. The calcium-containing composition, liquid water, and the CO2-containing gas having a temperature between 20 degree Celsius and 300 degree Celsius and a CO2 concentration between 1 volume % and 100 volume % are supplied to a reactor. By the supplied CO2-containing gas, the calcium-containing composition and water are made to flow in the reactor. Alternatively, the calcium-containing composition and water are in the reactor. Thus, CO2 is fixed in the calcium-containing composition and simultaneously the calcium-containing composition is dried to a water content of 5 mass % or less.