2020
DOI: 10.3390/fluids5040220
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Mitigating Thermal NOx by Changing the Secondary Air Injection Channel: A Case Study in the Cement Industry

Abstract: This work studies how non-premixed turbulent combustion in a rotary kiln depends on the geometry of the secondary air inlet channel. We target a kiln in which temperatures can reach values above 1800 degrees Kelvin. Monitoring and possible mitigation of the thermal nitric-oxide (NOx) formation is of utmost importance. The performed reactive flow simulations result in detailed maps of the spatial distribution of the flow, thermodynamics and chemical conditions of the kiln. These maps provide valuable informatio… Show more

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Cited by 11 publications
(17 citation statements)
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“…We studied the kiln previously described in [7]. It is used by our industrial partner for the production of specialty cement used in niche applications.…”
Section: Introductionmentioning
confidence: 99%
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“…We studied the kiln previously described in [7]. It is used by our industrial partner for the production of specialty cement used in niche applications.…”
Section: Introductionmentioning
confidence: 99%
“…In this way, we stay away from confidential information from our industrial partner. Like in [7], we employ the open-source software environment OpenFoam [8]. We refrain from comparison with experimental data.…”
Section: Introductionmentioning
confidence: 99%
“…Figure 14 helps to understand the complexity of thermal NOx formation. Not only does it depend on the gas temperature and oxygen concentration, but on the flow as well, as was proven in [17]. An example in Figure 14 is that the temperature profile of AFR's 8 and 10 are similar but the oxygen concentration is less in the hot region of the gas in the case for AFR of 8.…”
Section: Effect On Thermal Nox Formationmentioning
confidence: 59%
“…Our aim is to reduce the thermal NO emissions of an actually operating kiln burning on natural gas. As shown in our latest work [17], changing the air inlet geometry shows promising results in reducing both the peak temperatures as well as thermal NOx emissions. However it does require rebuilding the inlet side of the kiln and reinstalling the combustion air infrastructure.…”
Section: Introductionmentioning
confidence: 82%
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