Abstract
The manufacture of cement is highly energy-intensive and emission-intensive due to the large heat needed for plant. Nitrus Oxide (N2O) is one of the major greenhouse gas emitted into the atmosphere through it. The purpose of this work is to reduce NOX emissions inside calciner by using air staging and raw meal split technology. Tertiary air staging enables the fuel to be combusted in two different areas. Three cases are simulated using three different flow rate of tertiary air inside calciner using CFD software. The raw meal also split and passed into two zones. In order to gain confidence in the model used, non-premixed coal combustion is modeled and validated using the experimental data presented in the literature. Based on the results predicted, the calciner performance is analysed in depth. When the quantity of air through upper tertiary air inlet is increasing NOX formation decreasing. By comparing three cases it is found that case 70%–30% air-flow through the upper inlet and lower inlet respectively 362 ppm NOX produced, which is less than the other two cases.
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