Effect of limonite additive on combustion and NOx emission characteristics of anthracite

被引：0

作者：

Yang L. ^{[1
,2
]}

Luo H. ^{[1
]}

Zhang K. ^{[1
]}

Gong Z. ^{[1
]}

Wu W. ^{[1
,2
]}

机构：

[1] Key Laboratory of Integrated Exploitation of Bayanobo Multi-metal Resources, Baotou

[2] Inner Mongolia Autonomous Region Key Laboratory of Efficient Clean Combustion, Baotou

来源：

Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷

关键词：

Anthracite; Catalysis; Combustion behavior; Limonite; Nitrogen oxides;

D O I：

10.13225/j.cnki.jccs.2018.1703

中图分类号：

学科分类号：

摘要：

The use of pulverized coal additive technology to improve pulverized coal combustion efficiency and NOx emissions is a research hotspot in the field of coal energy conservation and emission reduction. In this paper, natural limonite was used as an additive to investigate the effects of different amounts of limonite on the combustion behavior and NOx emissions of anthracite. The test was divided into three parts. The first part used the thermogravimetric (TG) to analyze the influence of limonite on the burning behavior of anthracite. The 200-300 mesh limonite and anthracite were selected, and 20 mg anthracite and different addition amount (2%, 5%, 10%, 20%) were weighed. After the limonite was fully ground, 10 mg was placed in the sample crucible, the thermogravimetry was raised from room temperature to 900 ℃, and the TG-DTG curve was analyzed to calculate the combustion parameters. The second part used the fixed bed denitration test bench, adopted N2/O2 (4:1) atmosphere, the reaction temperature was 800 ℃, weighed 100 mg anthracite and mixed with different proportions of limonite, and obtained the instantaneous NOx through the flue gas analyzer, then the total amount of NOx emissions, and finally calculated the denitration rate, observed the effect of adding limonite on the denitrification performance of anthracite. The third part used SEM, XRD and XPS to analyze the samples before and after combustion to explore the catalytic principle. The results show that when the addition amount was 10%, the ignition temperature of anthracite was lowered by 18 ℃, the burnout temperature was lowered by 24 ℃, and the heat release was increased by 13.4%.Anthracite NOx emissions decreased by 48.07%.The comprehensive characterization of SEM, XRD and XPS found that the oxidation-reduction cycle of Fe promoted the combustion of pulverized coal and the reduction of NOx, thus simultaneously catalyzed the denitration of combustion. Limonite can effectively catalyze the combustion and denitrification performance of anthracite during pulverized coal combustion. This study will provide a reference for the application of natural mineral limonite in the field of efficient clean combustion. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.

引用

页码：305 / 312

页数：7

共 18 条

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