Cement Clinker Calcination with Oxygen-Enriched CO2 Exhaust Separation
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Solution Overview
Problem
The cement industry emits significant amounts of carbon dioxide, with challenges in reducing emissions due to the decarbonation of limestone and nitrogen content in exhaust gases, making it difficult to separate and recover carbon dioxide effectively.
Innovation Solution
A cement clinker producing system incorporating a cyclone preheater, rotary kiln, calcination furnace, and clinker cooler, with a combustion-supporting gas supply device providing high-oxygen concentration gas, and separate exhaust gas discharge passages to enhance carbon dioxide concentration and facilitate methane generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical absorption technique is used to separate carbon dioxide from exhaust gas containing nitrogen and oxide, then carbon dioxide recovery is achieved, but the facility size becomes large and separation difficulty increases
Solution Approach 1:
The invention extracts and removes nitrogen from the exhaust gas before carbon dioxide separation. By eliminating nitrogen as a interfering component, the remaining gas stream contains only carbon dioxide and water vapor, dramatically simplifying the separation process and reducing facility requirements while achieving high-purity carbon dioxide recovery
Solution Approach 2:
The exhaust gas treatment process is segmented into distinct stages: first removing nitrogen, then condensing water vapor, and finally recovering carbon dioxide. This segmentation allows each unit operation to be optimized independently and reduces the overall complexity compared to attempting to separate carbon dioxide directly from the full exhaust gas mixture
2Reliability
If nitrogen content in exhaust gas is high, then complete combustion is achieved, but carbon dioxide concentration decreases making separation difficult
Solution Approach 1:
The invention performs preliminary nitrogen removal before the carbon dioxide separation step. By removing nitrogen in advance, the subsequent carbon dioxide recovery process operates on a concentrated stream, making separation easier and more efficient while maintaining the benefit of complete combustion that produced the carbon dioxide in the first place
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 increases carbon dioxide concentration in exhaust gases, enabling efficient recovery and utilization for methane generation and reducing overall emissions.
Implementation Method 1
a calcination furnace, which is disposed on a front stream side of the rotary kiln, and is configured to promote decarbonation of the cement clinker raw material
Implementation Method 2
a combustion-supporting gas supply device configured to supply a combustion-supporting gas having a higher oxygen concentration than an oxygen concentration of air
Implementation Method 3
a cyclone preheater configured to preheat a cement clinker raw material
Implementation Method 4
a clinker cooler, which is disposed on a rear stream side of the rotary kiln, and is configured to cool the cement clinker
Data Source
AI summary
A cement clinker producing system, capable of providing a gas containing a carbon dioxide gas at a high concentration by increasing a carbon dioxide gas concentration for a part of an exhaust gas, includes a cyclone preheater to preheat a cement clinker raw material, a rotary kiln to burn the preheated cement clinker raw material so as to provide cement clinker, a calcination furnace to promote decarbonation of the cement clinker raw material, a clinker cooler to cool the cement clinker, a kiln exhaust-gas discharge passages to discharge an exhaust gas generated in the rotary kiln, a combustion-supporting gas supply device to supply a combustion-supporting gas having a higher oxygen concentration than air, a combustion-supporting gas supply passage to guide the combustion-supporting gas to the calcination furnace, and a calcination furnace exhaust-gas discharge passage to discharge a carbon dioxide gas-containing exhaust gas generated in the calcination furnace.