Simultaneous pyrolysis and char combustion
Simultaneous pyrolysis and char combustion
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DOI：
10.1016/0016-2361(93)90571-i
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发表时间：
1993-05
期刊：
影响因子：
7.4
通讯作者：
J. Saastamoinen;M. Aho;V. Linna
中科院分区：
文献类型：
--
作者：
J. Saastamoinen;M. Aho;V. Linna
在气流床反应器中，在700-1100 °C和氧含量<21vol%的条件下，对< 500 μm的煤和泥炭颗粒的同时热解和焦炭燃烧进行了实验和理论研究。提出了一种基于近红外辐射的颗粒温度测量方法。在脱挥发分阶段，当氧到达炭颗粒表面时，同时发生热解和炭氧化。均相和非均相燃烧的重叠有利于低温和高氧含量，以及颗粒尺寸的减小。提出了一种计算热解和半焦氧化同时进行的简化方法。模型计算表明，在某些条件下，最大的燃烧速率可以实现与特定的颗粒尺寸，因为更快的均匀燃烧的贡献增加相对于较慢的非均匀燃烧。
Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol%. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.