Effects of Coal Blending and Operating Conditions on Combustion and NOx Emission Characteristics in a Tangentially-fired Utility Boiler
Effects of Coal Blending and Operating Conditions on Combustion and NOx Emission Characteristics in a Tangentially-fired Utility Boiler
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DOI：
10.1016/j.egypro.2017.03.846
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Liu Debo;Qiang Lv;Feng Yongxin;Chang’an Wang;Xuan Liu;Kai Chen;Xu Kai;Zhong Jun;D. Che
中科院分区：
文献类型：
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作者：
Liu Debo;Qiang Lv;Feng Yongxin;Chang’an Wang;Xuan Liu;Kai Chen;Xu Kai;Zhong Jun;D. Che
采用数值模拟方法研究了过量空气系数和SOFA布置方式对燃用烟煤和混煤的四角切圆燃烧电站锅炉的温度分布、组分分布、NOx排放和燃尽的影响。模拟结果表明，燃料种类对燃烧室温度分布和NOx排放有一定的影响。此外，较高的过量空气系数可以抑制CO的生成，但会促进NOx的排放。温度和物种分布是高度相关的SOFA安排。SOFA技术仍是控制混煤燃烧过程中NOx排放的有效途径，但应考虑其对煤焦燃尽的不利影响。
The influences of operating conditions, such as excess air ratio and SOFA arrangement, on temperature distributions, species distributions, NOxemissions and burnout of a tangentially-fired utility boiler using bituminous and blended coal were investigated by numerical approach in the present study. The simulation results show that the fuel type exhibits certain effect on the temperature distributions and the NOxemissions. Moreover, higher excess air ratio could restrain the CO formation but promote NOxemission. The temperature and the species distributions are highly related to the SOFA arrangement. In addition, SOFA technology is still an effective approach to control the NOxemissions during blended coal combustion, while the disadvantageous effect on char burnout should be considered.