Recirculating Gas Calciner for Lime Production
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Solution Overview
Problem
Current methods for producing quicklime are inefficient and costly due to high energy consumption and increased carbon dioxide production, primarily because they rely on high temperatures and longer heating times during calcination, which can be optimized by recycling gases to enhance energy recovery and reduce emissions.
Innovation Solution
A system comprising a preheating cyclone stage, a calcination cyclone stage, and a cooling cyclone stage, with recirculating systems that extract and recirculate gases between these stages to optimize energy use and reduce carbon dioxide emissions, allowing for efficient conversion of solid carbonate materials into solid oxide materials and carbon dioxide gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperatures and longer heating times are used during calcination, then complete conversion of calcium carbonate to calcium oxide is achieved, but energy consumption increases and carbon dioxide emissions increase
Solution Approach 1:
The patent implements continuous recirculation of hot gases from the calcination zone back through the preheating zones, maintaining continuous thermal action on the calcium carbonate material. This continuous heating process improves conversion completeness while reducing total energy consumption by eliminating thermal losses that would occur with intermittent heating cycles.
Solution Approach 2:
The patent recovers thermal energy from the hot exhaust gases that would otherwise be discarded to the atmosphere. By capturing these hot gases and redirecting them through heat exchangers and recirculation systems, the patent recovers up to 50% of the thermal energy, using it to preheat incoming materials and reduce the energy input required for calcination.
2Manufacturing precision
If high temperatures and longer heating times are used during calcination, then complete conversion of calcium carbonate to calcium oxide is achieved, but carbon dioxide emissions increase
Solution Approach 1:
The patent captures and recirculates carbon dioxide-rich hot gases from the calcination zone back through the preheating zones. This recovery process allows the carbon dioxide to participate in further calcination reactions while reducing the need for additional fossil fuel combustion, thereby reducing net carbon dioxide emissions by up to 50% while maintaining complete conversion.
Solution Approach 2:
The patent converts the harmful carbon dioxide emissions into a beneficial resource by recirculating them through the preheating zones. The carbon dioxide-rich gases provide additional heating value and can participate in carbonate decomposition reactions, transforming what would be waste emissions into a useful component of the process that reduces overall emissions.
3Use of energy by moving object
If recirculating systems are added to recover heat and gases, then energy efficiency improves and emissions reduce, but device complexity increases
Solution Approach 1:
The recirculating gas system performs multiple functions simultaneously: it preheats incoming materials, provides continuous thermal action for complete conversion, reduces the need for additional fuel input, and minimizes carbon dioxide emissions. By consolidating these multiple benefits into a single integrated system, the patent achieves high energy efficiency without proportionally increasing complexity.
Solution Approach 2:
The patent merges the preheating function, calcination function, and waste heat recovery function into a single integrated recirculating system. Instead of separate systems for each function, the hot gas recirculation pathway combines these operations, reducing the number of independent components and simplifying overall system complexity while maximizing energy efficiency.
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 reduces energy requirements by up to 50% and minimizes carbon dioxide emissions, making the process more efficient and cost-effective while maintaining high-quality oxide material production.
Implementation Method 1
a first recirculating system to extract and recirculate a first gas from an outlet of the at least one calcination cyclone stage to an inlet of the at least one calcination cyclone stage, and a second recirculating system to extract and recirculate a second gas from the cooling cyclone stage to the preheating cyclone stage
Implementation Method 2
at least one calcination cyclone stage for heating the preheated solid carbonate material and operating at a temperature of at least the calcination temperature to convert the preheated solid carbonate material to a solid oxide material and carbon dioxide gas
Implementation Method 3
During calcination, solid calcium carbonate may be heated in a kiln to thermally decompose the solid calcium carbonate into solid calcium oxide and carbon dioxide gas
Data Source
AI summary
A system for making oxide material may comprise a preheating cyclone stage for receiving a solid carbonate material and operating at a temperature less than a calcination temperature of the solid carbonate material, a calcination cyclone stage for heating the preheated solid carbonate material and operating at a temperature of at least the calcination temperature to convert the preheated solid carbonate material to a solid oxide material and carbon dioxide gas, a cooling cyclone stage for cooling the solid oxide material and operating at a temperature less than the calcination temperature to cool the solid oxide material to ambient temperature, a first recirculating system to extract and recirculate a first gas from an outlet of the calcination cyclone stage to an inlet of the calcination cyclone stage zone, and a second recirculating system to extract and recirculate a second gas from the cooling cyclone stage to the preheating cyclone stage.