贵州无烟煤的燃烧动力学特性和NO_x生成机制试验研究

Combustion Kinetics Characteristics and Experimental Study on NO_x Formation Mechanism of Guizhou Anthracite

贵州无烟煤挥发分含量低、灰分大、灰融点低，是一种难利用的煤种。在热天平试验台上研究贵州无烟煤的燃烧动力学特性，并利用固定床反应器试验台研究贵州无烟煤的NOx生成机制。研究发现，该无烟煤是属于难着火、难稳燃、需要长时间才能燃尽的煤种；氧量的增加使贵州无烟煤NOx生成量增加，对焦碳燃烧阶段的NOx生成影响大；在1000-1200℃之间，温度的升高使NOx生成量降低，尤其是焦碳燃烧阶段的NOx生成量大幅降低；粒径的减小使挥发分燃烧阶段的NOx生成量上升，而对焦碳燃烧阶段的NOx生成影响小，当粒径小于68μm时，该无烟煤的NOx生成量显著升高。

Guizhou anthracite is a kind of coal not good to be utilized, and it has low volatile, high ash content and low ash melting point. The combustion kinetics characteristics and NOx formation mechanism of Guizhou anthracite were investigated on a thermogravimetry analysis test bench and a fixed-bed test bench separately. The follows are discovered： Guizhou anthracite is hard to ignite and burn stably, and needs long time to burn out; increase of oxygen concentration raises NOx formation, especially in char combustion section; between 1 000℃ and 1 200 ℃, higher temperature makes NOz formation decrease, also especially in char combustion section; it increases NOx formation in volatile combustion section to reduce pulverized coal particle size, but NOx formation in char combustion section is insensitive to it; when pulverized coal particle size is under 68μm, volume of NOn increases obviously.