Abstract

The state of and development prospects for the technology of selective noncatalytic reduction (SNCR) of nitrogen oxides in the combustion products of organic fuels are considered. Its advantages and disadvantages and factors influencing the efficiency of its application for gas purification of technological furnaces for natural gas conversion at power and waste incineration boilers are analyzed. The results of experimental studies into the process of reducing nitrogen oxides by products of thermal decomposition of carbamide are presented, depending on the temperature, flow rate, and the method of introducing the reagent into the flue gases. The results of pilot tests and industrial implementation of the technology are shown. The possibility of increasing the technical and economic indicators of SNCR plants by organizing a multizone injection of the reducing mixture into the gases to be cleaned with a flow rate less than the stoichiometric one is substantiated, which makes it possible to achieve high technology efficiency with a minimum ammonia slip. Relatively low capital costs for the construction of SNCR plants and the manufacture of main equipment at domestic enterprises and the small area required for equipment placement can significantly reduce emissions of nitrogen oxides into the atmosphere, even at operating boilers in a short time. It is advisable to widely introduce SNCR technologies at pulverized coal TPPs and enterprises for thermal waste disposal as one of the best available technologies.

中文翻译：

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SNCR技术的发展及其应用前景

摘要

考虑了有机燃料燃烧产物中氮氧化物选择性非催化还原（SNCR）技术的现状和发展前景。分析了其在电力和垃圾焚烧锅炉天然气转化工艺炉煤气净化中的优缺点及影响其应用效率的因素。根据温度、流速和将试剂引入烟道气的方法，介绍了通过尿素热分解产物还原氮氧化物过程的实验研究结果。显示了该技术的试点测试和工业实施的结果。通过将还原性混合物以小于化学计量的流速组织多区喷射到待净化气体中来提高 SNCR 装置的技术和经济指标的可能性得到证实，这使得实现高技术效率成为可能最小的氨泄漏。国内企业建设SNCR装置和制造主要设备的资金成本相对较低，设备放置所需的占地面积小，即使在短时间内运行锅炉，也可以显着减少氮氧化物向大气中的排放。建议在煤粉 TPP 和企业广泛引入 SNCR 技术，将其作为最佳可用技术之一。