Decarbonation and Hydration of Carbonated Materials
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Solution Overview
Problem
Traditional kilns for decarbonating limestone or dolomite emit significant CO2 and have inefficiencies in heat management, leading to high energy consumption and environmental impact.
Innovation Solution
A process and device for decarbonation and hydration of carbonate materials, involving a first circuit for decarbonation and a second circuit for hydration, where decarbonated particles are transferred and hydrated, with heat recovery from the hydration process to optimize energy use and reduce CO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional kilns are used for decarbonation, then the process is simple to operate, but significant amounts of CO2 are emitted and energy efficiency is low
Solution Approach 1:
The process is divided into two separate circuits: a first circuit for decarbonation where CO2 is concentrated and captured, and a second circuit for hydration where CO2-free atmosphere is maintained. This segmentation prevents CO2 mixing and enables both CO2 capture and efficient operation
Solution Approach 2:
Decarbonated particles act as an intermediary carrier, transferring from the CO2-rich first circuit to the CO2-free second circuit through a selective separation means. This intermediary enables the separation of the two processes while maintaining their functional independence
2Device complexity
If a single circuit is used for both decarbonation and hydration, then the device complexity is low, but recarbonation of the product occurs and energy recovery is limited
Solution Approach 1:
The system is segmented into two distinct circuits with different atmospheric compositions. The first circuit operates with CO2-rich atmosphere for decarbonation, while the second circuit operates with CO2-free atmosphere for hydration, preventing recarbonation and enabling product purification
Solution Approach 2:
The process maintains continuous operation with decarbonated particles continuously transferred from the first circuit to the second circuit. The CO2-rich stream from the first circuit is continuously utilized in the second circuit, maintaining uninterrupted productive action
3Loss of energy
If heat recovery measures are introduced in traditional kilns, then energy efficiency improves, but the heat cannot be effectively utilized due to dilution in flue gas
Solution Approach 1:
The CO2-rich stream is extracted and concentrated in the first circuit, separating it from the diluted flue gas of traditional kilns. This extracted CO2 stream serves as the atmosphere for decarbonation, concentrating the harmful factor into a useful resource while enabling effective heat recovery
4Productivity
If high production throughput is achieved, then productivity increases, but maintaining CO2-free atmosphere for hydration becomes more difficult
Solution Approach 1:
Decarbonated particles serve as an intermediary that can be rapidly transferred between the CO2-rich first circuit and the CO2-free second circuit. This intermediary mechanism enables high throughput by maintaining atmospheric separation while increasing production speed
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 process achieves high production throughput of hydrated products while producing a CO2-rich stream suitable for sequestration or use, and recovers heat generated during hydration, enhancing energy efficiency and reducing environmental impact.
Implementation Method 1
heating particles of carbonated materials in a reactor of a first circuit up to a temperature range in which carbon dioxide of the carbonated materials is released
Implementation Method 2
conveying the particles of carbonated materials by a first entraining gas in the first circuit for preheating the carbonated materials
Implementation Method 3
hydrating the decarbonated particles in contact with water as liquid and/or steam, and optionally in the presence of a dilution gas
Implementation Method 4
transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas
Data Source
AI summary
A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of the decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit comprising a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide; The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.