Effect of CaO on NO x Reduction by Selective Non-Catalytic Reduction under Variable Gas Compositions in a Simulated Cement Precalciner Atmosphere

Ye Sun, Weiyi Fan, Tianle Zhu and Xiaowei Hong
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Ye Sun: School of Space and Environment, Beihang University, Beijing 100191, China
Weiyi Fan: School of Space and Environment, Beihang University, Beijing 100191, China
Tianle Zhu: School of Space and Environment, Beihang University, Beijing 100191, China
Xiaowei Hong: School of Space and Environment, Beihang University, Beijing 100191, China

IJERPH, 2017, vol. 14, issue 12, 1-12

Abstract: High-concentration CaO particles and gas compositions have a significant influence on NO x reduction by selective non-catalytic reduction (SNCR) in cement precalciners. The effect of gas composition on NO x reduction by SNCR with NH 3 was studied in a cement precalciner atmosphere with and without CaO at 700–1100 °C. It was found that CaO significantly lowers NO x reduction efficiency between 750 °C and 1000 °C, which is attributed to the catalytic oxidation of NH 3 to NO. Although increasing NH 3 concentration was advantageous to NO x reduction, the existence of CaO led to the opposite result at 750–900 °C. Adding H 2 O can suppress the negative effect of CaO on NO x reduction. Decreasing O 2 content from 10% to 1% shifts the temperature range in which CaO has a significant effect from 750–1000 °C to 800–1050 °C. CO has a variety of influences on the CaO effect under different experimental conditions. The influences of NH 3 , H 2 O, O 2 , and CO on the effect of CaO can be attributed to the impacts of the gas compositions on gas-phase NH 3 conversion, gas-solid catalytic NH 3 oxidation, or both processes. A proposed pathway for the effect of gas compositions on NO x reduction in CaO-containing SNCR process was developed that well predicted the CaO-containing SNCR process.

Keywords: CaO; NO x reduction; SNCR; cement precalciner atmosphere (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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