Experimental study on the combustion and NOx emission characteristics of a bituminous coal blended with semi-coke

被引：45

作者：

Hu, Lilin ^{[1
]}

Zhang, Yang ^{[1
]}

Chen, Denggao ^{[1
]}

Fang, Jugang ^{[1
]}

Zhang, Man ^{[1
]}

Wu, Yuxin ^{[1
]}

Zhang, Hai ^{[1
]}

Li, Zhenshan ^{[1
]}

Lyu, Junfu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Energy & Power Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2019年 / 160卷

基金：

中国国家自然科学基金;

关键词：

Semi-coke; Coal; Co-combustion; Drop tube furnace; NOx; Burnout rate; BEHAVIOR; COCOMBUSTION; TGA; BIOMASS;

D O I：

10.1016/j.applthermaleng.2019.113993

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Combustion and NOx emission characteristics of a bituminous coal (BC) blended with semi-coke (SC) are investigated using a Thermogravimetric Analyzer (TGA) and Drop Tube Furnace (DTF) at a different SC blending ratio X-sc TGA results show that BC and SC have similar mass loss patterns but BC-SC blends have a second trough on their DTG curves. The addition of semi-coke increases ignition and burnout temperatures of the blends, but barely affects the burnout rate. Within 95% mass loss, the overall combustion index first decreases and then increases with X-sc. DTF results reveal that the burnout rate and NOx emission of BC-SC blends are influenced by excess air ratio, furnace temperature, blending ratio and residence time. With sufficient air and residence time, the burnout rates of BC-SC blends and SC can be greater than 97% and SC blending slightly decreases the total NOx formation. Under O-2-deficit conditions, the burnout rate decreases with increasing X-sc; SC blending and longer residence time will reduce NOx emission. The trends are significantly more obvious at smaller excess air ratios. The NOx formation of BC-SC blends cannot simply be predicted by linear superposition of the two fuels. Based on the burnout and NOx emission data, less than 40% SC blending and proper air staging are recommended for BC-SC co-combustion.

引用

页数：7

共 24 条

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