Riser Line Layout for High-CO2 Calcination Without Overheating
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Solution Overview
Problem
Existing thermal treatment installations for free-floating raw materials, particularly in cement production, face issues with high temperatures leading to potential damage to the inner walls and inefficient CO2 content in exhaust gases, especially when using oxygen-rich combustion gases.
Innovation Solution
A riser line system with controlled fuel and raw material introduction, including inert gas injection, temperature regulation, and guided gas flow to manage heat distribution and prevent overheating, ensuring safe operation and high CO2 content in exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If oxygen-rich combustion gas is introduced into the calcinator, then CO2 content in exhaust gas increases, but very high temperatures occur causing damage to inner wall and melting of raw material
Solution Approach 1:
The calcinator is divided into multiple heating zones (first heating zone with first fuel inlet, second heating zone with second fuel inlet) along the gas flow direction. This segmentation allows temperature control in different regions, preventing localized overheating while maintaining high CO2 content through oxygen-rich combustion gas introduction.
Solution Approach 2:
Different regions of the calcinator are provided with different quality characteristics - the first heating zone receives oxygen-rich combustion gas with specific oxygen concentration (20-100%), while fuel inlets are positioned at different locations to create localized temperature zones. This ensures high CO2 production in certain areas without causing damaging temperatures elsewhere.
2Loss of energy
If high oxygen fraction gas (30-100% oxygen) is used for combustion, then exhaust gas volume is reduced, but extremely high temperatures cause wall damage and material melting
Solution Approach 1:
Raw material is introduced into the calcinator before the fuel inlets, allowing it to be positioned upstream of the combustion zones. This preliminary positioning ensures that raw material does not directly expose to the highest temperature zones where oxygen-rich gas is introduced, preventing melting while still benefiting from the reduced exhaust gas volume.
Solution Approach 2:
The riser line structure acts as an intermediary between the oxygen-rich combustion gas and the raw material/wall structure. It distributes the high-temperature gas flow in a controlled manner, preventing direct contact between extreme heat and vulnerable components while maintaining the energy efficiency benefits of oxygen-enriched combustion.
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 effectively prevents overheating and ensures safe operation while maintaining high CO2 content in exhaust gases, enhancing the thermal treatment process efficiency and safety.
Implementation Method 1
The riser line has at least one fuel inlet for introducing fuel into the riser line... introducing oxygenated gas for the combustion of carbonaceous fuel
Implementation Method 2
a riser line through which hot gases can flow... for the thermal treatment of raw material
Data Source
AI summary
An installation for thermal treatment of free-floating raw material, in particular cement raw meal and/or mineral products, may include a riser line through which hot gases can flow. The riser line has at least one fuel inlet for introducing fuel into the riser line. The riser line has at least one raw meal inlet for introducing raw meal into the riser line, which raw meal inlet is arranged upstream of the fuel inlet in a flow direction of gas inside the riser line. Further, a method for thermal treatment of free-floating raw material may involve introducing fuel via a fuel inlet into a riser line for guiding hot gases and introducing raw meal into the riser line. The raw meal is introduced into the riser line upstream of the fuel inlet in the flow direction.