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Experimental Study on Combustion Characteristics of Pulverized Coal Based on Partial Gasification of Circulating Fluidized Bed

机译：基于循环流化床部分气化的煤粉燃烧特性试验研究

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摘要

How to reduce nitrogen oxides in coal combustion process has always been a hot and difficult topic in the research process. In this paper, under the condition of circulating fluidized bed air equivalence ratio of 0.61 and gasification temperature of 970 degrees C, the partial gasification and combustion method is used to study the influence of the secondary air distribution modes on the gasification and combustion characteristics. Three aspects are discussed in this test: partial gasification characteristics, combustion characteristics, and coal-nitrogen migration and transformation characteristics. The experimental results show that under partial gasification conditions of the circulating fluidized bed, nearly 87% of the fuel nitrogen at the outlet of the circulating fluidized bed is converted into nitrogen in the coal gas, and the ratio of fuel nitrogen to N-2 is about 64.11%, the conversion rate of HCN is about twice that of NH3, and the combustion reactivity of partial gasification fuels increased at the outlet of circulated fluidized bed. Different secondary air distribution modes will affect the combustion process and the temperature distribution of the combustion chamber. When the secondary air is mixed with the high-temperature coal-based fuel in advance, the entire combustion reaction and the maximum temperature point in the combustion chamber will be moved up. When secondary air is injected simultaneously with high-temperature coal-based fuels, NOx emissions are approximately 90 mg/m(3) (@6% O-2), the conversion rate of fuel nitrogen to NOx is 2.09%, and when nearly half or all of the secondary air is directly premixed into the high-temperature coal-based fuel, the NOx emissions are about 70 mg/m(3) (@6% O-2), the conversion ratio of fuel nitrogen to NOx is reduced to about 1.63%.
机译：如何在燃煤过程中减少氮氧化物一直是研究过程中的热点和难点。本文在循环流化床空气当量比为0.61，气化温度为970℃的条件下，采用部分气化燃烧法研究二次空气分配方式对气化燃烧特性的影响。该测试讨论了三个方面：部分气化特性，燃烧特性以及煤氮迁移和转化特性。实验结果表明，在循环流化床部分气化条件下，循环流化床出口处近87％的燃料氮转化为煤气中的氮，燃料氮与N-2的比为HCN的转化率约为NH3的64.11％，并且部分气化燃料的燃烧反应性在循环流化床出口处增加。不同的二次空气分配模式将影响燃烧过程和燃烧室的温度分布。当二次空气预先与高温煤基燃料混合时，整个燃烧反应和燃烧室内的最高温度点将上升。当二次空气与高温煤基燃料同时注入时，NOx排放约为90 mg / m（3）（@ 6％O-2），燃料氮转化为NOx的转化率为2.09％，当接近一半或全部二次空气直接预混到高温煤基燃料中，NOx排放量约为70 mg / m（3）（@ 6％O-2），燃料氮转化为NOx的比例为减少到约1.63％。

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    《Energy & fuels》 |2020年第1期|989-995|共7页
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    Chinese Acad Sci Inst Engn Thermophys Beijing 100190 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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