Vertical Reactor Calcination with Segmented Gas Flow
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Solution Overview
Problem
Current calcination processes for minerals, such as limestone, result in high greenhouse gas emissions due to the production of carbon dioxide during the calcination and combustion processes, with existing methods struggling to efficiently separate and capture CO2 from flue gases, and they often require long residence times that lead to inefficiencies and environmental impacts.
Innovation Solution
A system and method for calcination that uses a vertically disposed reactor with horizontal forces, superheated steam, and flameless distributed heating to minimize residence time and separate gas products efficiently, incorporating a gas-granule separator to flush out CO2 and utilize centrifugal forces for efficient heat transfer and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional vertical kilns are used for calcination, then energy efficiency is optimized, but carbon dioxide emissions are high and separation of CO2 from flue gases is difficult
Solution Approach 1:
The system divides the calcination process into multiple reactor segments (first reactor segment, second reactor segment, etc.) arranged in series. Each segment performs a portion of the calcination, allowing the process to be completed in stages with shorter residence time in each segment, thereby reducing overall CO2 emissions while maintaining energy efficiency
Solution Approach 2:
The patent introduces an intermediary gas (such as nitrogen or carbon dioxide) that is circulated through the reactor segments. This intermediary gas serves as a medium to control the partial pressure of CO2 in each segment, facilitating the calcination reaction while enabling easier separation and capture of CO2 emissions
2Reliability
If longer residence time is used in calciners, then complete calcination is achieved, but energy efficiency decreases and environmental impact increases
Solution Approach 1:
By dividing the calcination process into multiple reactor segments, the system achieves complete calcination (high reliability) through cumulative processing in each segment. The residence time is distributed across segments rather than requiring long continuous exposure in a single reactor, improving overall energy efficiency
Solution Approach 2:
The system maintains continuous calcination action across multiple reactor segments with interconnected gas flow. The intermediary gas circulates continuously through all segments, ensuring that calcination proceeds efficiently throughout the system without interruption, achieving both high conversion and energy efficiency
3Object-generated harmful factors
If multiple reactor segments are used to reduce residence time, then CO2 emissions are reduced, but system complexity increases
Solution Approach 1:
The patent combines multiple reactor segments into a single integrated system with shared gas circulation and heat exchange mechanisms. The segments are connected in series with common intermediary gas flow paths, allowing the system to function as a unified whole rather than separate independent units, thereby reducing operational complexity despite increased structural complexity
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
This approach significantly reduces carbon dioxide emissions by producing essentially pure CO2, allowing for cost-effective capture, and achieves a high degree of calcination within seconds, reducing the calcination temperature and energy costs while maintaining product reactivity.
Implementation Method 1
a reactor heat exchange unit thermally coupled to a wall of the reactor segment for providing heat to the flowing granules inside the reactor segment through heat transfer through the wall of the reactor segment
Implementation Method 2
one or more inlets formed in the reactor segment for introducing a superheated steam into the reactor segment to create conditions of a gas-solid multiphase system
Implementation Method 3
a gas granule separator coupled to the reactor chambers that utilises a vortex formed from the passage of material through the reactor chamber to separate the gas products from the granules
Implementation Method 4
the injector unit being disposed at a top portion of the reactor segment, whereby granules of the feedstock move through the reactor segment in a granular flow under at least one of a group consisting of a force of steam, gravitational force and a centrifugal force
Data Source
AI summary
A system and method for the calcination of minerals. The system comprises a vertically disposed reactor segment configured to impart horizontal forces on particles passing through the reactor segment in a vertical direction; an injector unit for receiving granular feedstock, the injector unit being disposed at a top portion of the reactor segment, whereby granules of the feedstock move through the reactor segment in a granular flow under at least one of a group consisting of a force of steam, gravitational force and a centrifugal force; a reactor heat exchange unit thermally coupled to a wall of the reactor segment for providing heat to the flowing granules inside the reactor segment through heat transfer through the wall of the reactor segment; one or more inlets formed in the reactor segment for introducing a superheated gas into the reactor segment to create conditions of a gas-solid multiphase system; and one or more exhaust openings formed in the retort segment such that gas products are at least partially flushed from the reactor segment under the flow of the superheated gas from the inlets to the exhaust openings.