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首页> 外文期刊>The Canadian Journal of Chemical Engineering >STUDY ON THE COMBUSTION AND NOX EMISSION CHARACTERISTICS OF LOW RANK COAL IN A CIRCULATING FLUIDIZED BED WITH POST-COMBUSTION
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STUDY ON THE COMBUSTION AND NOX EMISSION CHARACTERISTICS OF LOW RANK COAL IN A CIRCULATING FLUIDIZED BED WITH POST-COMBUSTION

机译：燃烧后循环流化床中煤燃烧和NOx排放特性研究

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摘要

The combustion and NOx emission characteristics of low rank coal have been investigated in a circulating fluidized bed test plat, which was composed of a circulating fluidized bed (CFB) and post-combustion chamber (PCC). The effects of the air stoichiometric ratio in the circulating fluidized bed furnace and air arrangement in the post-combustion chamber were studied. In the optimized experimental condition, with the air stoichiometric ratio in the CFB ((CFB)) at 0.963, and post-combustion air (PCA) injected into the PCC using ports PCA1 and PCA3, the NOx emission was reduced to 48.7 mg/m(3). The conversion of the fuel-nitrogen in the coal into NOx did not occur under the reducing atmosphere in the circulating fluidized bed furnace. The final quantity of NOx generated from the combustion in the PCC was formed from gaseous HCN and residual nitrogen in fly ash, which flowed with flue gas from the CFB furnace. Enhancing the burnout fraction of coal in the CFB and using the air arrangement in the PCC could effectively reduce the final emission of NOx.
机译：已经在循环流化床测试平面中研究了低级煤的燃烧和NOx排放特性，其由循环流化床（CFB）和后燃烧室（PCC）组成。研究了空气化学计量比在燃烧室循环流化床炉中的影响和在后燃烧室中的空气布置。在优化的实验条件下，在0.963的CFB（（CFB））中的空气化学计量比，使用端口PCA1和PCA3注入PCC的后燃烧空气（PCA），NOx排放减少到48.7mg / m （3）。在循环流化床炉中的还原气氛下，在煤中的燃料 - 氮的转化在循环流化床中的还原气氛中不会发生。从PCC中燃烧产生的NOx的最终量由粉煤灰中的气态HCN和残留氮，其用来自CFB炉的烟道气流。增强CFB中的煤的烧坏分数并使用PCC中的空气排列可以有效地降低NOx的最终排放。

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