玻璃熔窑烟气再循环联合燃尽风燃烧数值模拟

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摘要玻璃熔窑在采用高温低氧燃烧(HTAC)技术的条件下使用烟气再循环联合燃尽风燃烧对降低NO_x排放有极其显著的效果。基于数值计算方法建立了烟气再循环联合燃尽风燃烧数学模型,并通过实际运行数据与仿真结果对比验证了该模型的可靠性。研究表明:(1)随着烟气循环率增长,炉膛火焰温度下降,小炉出口NO_x浓度下降;(2)加入燃尽风有利于提升烟气对玻璃液的热通量;(3)本研究条件下烟气再循环联合燃尽风降氮燃烧优化运行参数为:烟气循环率5%,燃尽风率20%;在优化参数下运行时,其对应的NO_x质量流量为0.009 51 kg·s^-1,热通量为41.54 kW·s^-1,与基础工况(循环率0、燃尽风率0)相比,NO_x排放浓度下降60.73%,烟气与玻璃液间热通量增加13%;而与循环率0、燃尽风率20%的工况相比,NO_x浓度下降49.4%,烟气与玻璃液间热通量下降3.7%。为玻璃熔窑NO_x减排提供了理论支持。

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	吴伟
	徐顺生
	贺家臻
	裴斐
	冉伟铃

关键词：玻璃熔窑烟气循环数值模拟降氮燃烧燃尽风

Abstract： The use of flue gas recirculation combined with over-fired air combustion under the conditions of high temperature and low oxygen combustion (HTAC) technology in the glass melting furnace has an extremely significant effect on reducing NO_x emissions. In this paper, a mathematical model of flue gas recirculation combined with over-fired air combustion is established based on numerical calculation methods, and the reliability of the model is verified by comparing actual operating data with simulation results. Research results show: (1) As the flue gas circulation rate increases, the temperature of furnace flame decreases, and the NO_x concentration at the outlet of the small furnace decreases; (2) The addition of burn-out air is beneficial to increase the heat flux of the flue gas to the molten glass; (3) The optimized operating parameters of flue gas recirculation combined with over-fire air nitrogen reduction combustion under the research conditions of this paper are: flue gas circulation rate 5%, over-fire air rate 20%. Compared with the basic operating conditions (circulation rate 0, over-fire air rate 0), when running under optimized parameters, the corresponding NO_x mass flow is 0.009 51 kg·s^-1, and the heat flux is 41.54 kW·s^-1. Compared with the basic operating conditions (circulation rate 0, over-fire air rate 0), the NO_x emission concentration is reduced by 60.73%, and the heat flux between flue gas and glass liquid is increased by 13%. Compared with the working condition of circulation rate 0 and over-combustion air rate 20%, the NO_x concentration drops by 49.4%, and the heat flux between flue gas and molten glass drops by 3.7%. The results of this study provide theoretical support for NO_x reduction in glass melting furnaces.

Keywords： glass furnace flue gas circulation numerical simulation reduced nitrogen combustion over-fire air

Received 2021-09-10;

Fund:国家自然科学基金(51590891);郴州市科技攻关项目(CZ2013163)。

Corresponding Authors: 徐顺生,副教授,E-mail:787749816@qq.com。 Email: 787749816@qq.com

About author: 吴伟(1996-),男,硕士研究生,研究方向为热工过程仿真与优化。

引用本文:

吴伟, 徐顺生, 贺家臻, 裴斐, 冉伟铃.玻璃熔窑烟气再循环联合燃尽风燃烧数值模拟[J]. 化学工业与工程, 2022,39(5): 97-108

WU Wei, XU Shunsheng, HE Jiazhen, PEI Fei, RAN Weiling.Numerical simulation of flue gas recirculation combined over-fired air combustion in glass melting furnace[J]. Chemcial Industry and Engineering, 2022,39(5): 97-108

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