Effects of water vapor and temperature on NOx and CO emissions during converter gas combustion. (15th November 2019)

• Record Type: Journal Article
• Authors: Zhai, Yinghua; Li, Sen; Yan, Weiping; Wei, Xiaolin; Zhang, Leyu; Wang, Youtian
• Is Part Of: Fuel. Volume 256(2019)
• Publication Date: 2019-11-15
• Subjects: Water vapor concentration -- Converter gas -- Inlet temperature -- CO emission -- NO emission; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.115914
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The effect of water vapor concentration on converter gas combustion is investigated. Increasing water vapor concentration makes CO and NO emissions decrease. CO emission decreases sharply when C H2O, inlet increases from 0 to 0.4%. Abstract: Converter gas is a valuable fuel in the converter steelmaking process, and NOx and CO emissions are high due to the high temperature combustion and the absence of H2 O vapor. The effects of H2 O vapor concentration and the inlet temperature of converter gas on NOx and CO emissions in the combustion are investigated by a detailed chemical reaction mechanism. CO emission decreases sharply when C H2O, inlet increases from 0 to 0.4%. At C H2O, inlet > 0.4% and T inlet < 950 K, for the reduction of CO emission, the inlet temperature of converter gas is predominant over that of H2 O vapor in air. The inlet temperature of converter gas has noticeable influence on NO emission at C H2O, inlet < 2%. With the increase of C H2O, inlet, NO emission first increases, then reaches a peak value, finally decreases. At T inlet > 1050 K and C H2O, inlet > 2%, NO emission noticeably decreases with C H2O, inlet . In the presence of H2 O, H and OH free radicals are easily formed, the reduction path of NO is as follows: NO → NH/HNO → N2 .