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Application of SNCR Denitrification Technology for Flue Gas From Cement Kilns: A Mini Review

机译：SNCR脱氮技术在水泥窑烟气中的应用：综述

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摘要

Currently, the emission amount of nitrogen oxide (NOx) from the cement industry accounts for about 10-12% of total emissions in China, and the cement industry has become the third biggest source of NOx, following thermal power plants and vehicles. Thus, the task for controlling NOx emission from the cement industry is very urgent. Selective non-catalytic reduction (SNCR) denitrification technology has many advantages, such as low investment cost, short construction period, simple facilities and low operating cost, etc. This technology is suitable for the reconstruction of the existing cement production lines and the matching construction of the new cement production lines, and is currently considered to be the best denitrification technique for cement kilns. The basic principle and process of SNCR in cement kilns were analyzed and the key points of SNCR denitrification process in cement kilns were summarized, including the proper reaction temperature window (850~1050°C), mixing of reducing agent and flue gas, NH3/NOX mole ratio, residence time, the control of ammonia escape and the effect of calcium base powder. The current status of SNCR simulation and industrial application in cement kilns were also comprehensively analyzed, together with the future development direction of SNCR denitrification technology in cement industry.
机译：目前，水泥行业的氮氧化物排放量约占中国总排放量的10-12％，水泥行业已成为继火力发电厂和车辆之后的第三大NOx排放源。因此，控制水泥工业的NOx排放的任务非常紧迫。选择性非催化还原（SNCR）反硝化技术具有投资成本低，工期短，设施简单，运行成本低等优点。该技术适用于现有水泥生产线的改造及配套建设。新型水泥生产线的一部分，目前被认为是水泥窑的最佳反硝化技术。分析了水泥窑SNCR的基本原理和工艺，总结了水泥窑SNCR反硝化的关键点，包括适当的反应温度范围（850〜1050°C），还原剂与烟气的混合，NH3 / NOX摩尔比，停留时间，氨逃逸的控制以及钙基粉末的作用。全面分析了SNCR模拟的现状和在水泥窑炉中的工业应用，以及SNCR反硝化技术在水泥工业中的未来发展方向。

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