Study on the influence of different thermal coals on the mixed-burning characteristics of ventilation air methane and pulverized coal

被引:0
作者
Hao, Chaoyu [1 ,3 ]
Liu, Yufei [1 ]
Chen, Yankun [1 ]
Zhang, Yachao [2 ]
Deng, Cunbao [1 ]
机构
[1] Taiyuan Univ Technol, Sch Safety & Emergency Management Engn, Taiyuan, Shannxi, Peoples R China
[2] Weinan Shaanxi Coal Qichen Technol Co Ltd, Weinan, Shannxi, Peoples R China
[3] Taiyuan Univ Technol, Sch Safety & Emergency Management Engn, Taiyuan 030024, Peoples R China
基金
中国国家自然科学基金;
关键词
CH4; conversion; ignition temperature; mixed-burning; NO emission characteristics; species of thermal coal; ventilation air methane; OXIDATION; COMBUSTION;
D O I
10.1002/ghg.2271
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
To effectively utilize ventilation air methane (VAM), it is proposed to pass it into the boiler of the coal-fired power plant for mixed combustion. However, the different types of thermal coal utilized present distinct characteristics when mixed with VAM. In this paper, lignite, bituminous coal, and anthracite are selected to study the CH4 conversion rate, system ignition temperature, and NO emission characteristics of the VAM-pulverized coal coupled system on a fluidized bed experimental platform. The experimental results show that the ignition temperatures of VAM are 748, 736, and 732(degrees)C when the CH4 concentration is 0.25, 0.5, and 0.75%. After the addition of thermal coal, the ignition temperature decreased significantly. When the CH4 concentration is 0.25%, the ignition temperature of the lignite-VAM system is the lowest, which is 450(degrees)C. Anthracite has the strongest catalytic effect on CH4 combustion. When the heating rate is 5(degrees)C /min, the reaction rate of CH4 is the fastest in the anthracite-VAM coupled system. Under laboratory conditions, the peak NO concentration in the coal-VAM coupled system was lignite > bituminous coal > anthracite at different CH(4 )concentrations, and the CH4 in VAM had a reducing action on the NO generated during mixed combustion, with a stronger reducing effect observed as the CH4 concentration increased. The results of this study can lay the foundation for the industrial application of the mixed combustion of VAM and thermal coal, and be of great significance for solving the practical problems caused by the change of boiler coal types. (c) 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.
引用
收藏
页码:427 / 441
页数:15
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