| Related citation: | Yongtang Wang,Hui Wang,Songlin Liu,Hairui Yang,Jiangquan Wu.Effect of Moisture on Combustion Characteristics of High-Moisture-Content Coal Slime[J].Journal of Harbin Institute Of Technology(New Series),2022,29(1):77-87.DOI:10.11916/j.issn.1005-9113.2020084. |
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| Author Name | Affiliation | | Yongtang Wang | Academia Sinica, Harbin Electric Corporation, Harbin 150028, China | | Hui Wang | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | Songlin Liu | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | Hairui Yang | Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China | | Jiangquan Wu | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: |
| The effects of moisture content on the combustion characteristics and pore structure change of coal slime are studied in this paper. The effect of moisture content on the bed temperature change, combustion efficiency, and NOx and SO2 emission were obtained in a bench-scale fluidized bed reactor, revealing that the lowest bed temperature decreases with the increase in moisture content, but the effect on the highest bed temperature is not the same. Moreover, with the increase in moisture content, the observed degree of blackening of the flue gas increased, and more CO was produced, which in turn leads to a lower combustion efficiency of the coal slime. However, the presence of moisture plays a positive role in the reduction of NOx and SO2. With the increase in moisture content, the amount of NOx and SO2 produced tends to decrease. The effect of water on the combustion process of slime is mostly the impact of the severe vaporization process in the early stage to form a large water vapor channel, which is beneficial to the evaporation and loss of water, conducive to the reaction of water and coal combustion products, such as the formation of CO, reduction of NOx, SO2, etc. The large holes formed by the impact of water vapor decreased with the decrease of moisture content, and the nanoscale pores are mostly caused by the combustion process of volatilization and coke formation after the end of vaporization, and increase with the decrease of moisture content. |
| Key words: moisture combustion characteristics pore structure coal slime |
| DOI：10.11916/j.issn.1005-9113.2020084 |
| Clc Number:TQ534 |
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| Descriptions in Chinese: |
| 水分对高水分煤泥燃烧特性的影响 王永堂1，王辉2，刘松霖2，杨海瑞3，吴江全2 （1. 哈电集团中央研究院，哈尔滨150028；2. 哈尔滨工业大学 能源科学与工程学院，哈尔滨 150001；3清华大学 能源与动力工程系，北京 100084） 摘要：本文研究了煤泥中水分对其燃烧特性及孔隙结构变化的影响。在实验室规模的流化床反应器上获得了水分对床温变化、燃烧效率及NOx与SO2排放的作用规律，揭示了最低床温会随水分的增加而降低，而最高床温的变化与此不同。而且，随着水分的增加，观测到的烟气黑度增加并生成更多CO，从而导致煤泥燃烧效率降低。然而，水分的存在对降低NOx和SO2有利，随着水分增加，NOx和SO2的生成量趋于降低。水分对煤泥燃烧过程的影响主要体现在燃烧初期水分剧烈蒸发形成了较大的水蒸气通道，有利于水分的蒸发和散失，也有利于水分与煤燃烧产物的反应，例如CO的生成，NOx与SO2的降低等。由水蒸气作用形成的大孔会随着水分减少而减少，纳米级孔主要是蒸发结束后挥发分燃烧与焦炭形成过程所致，并会随着水分的减少而增加。 关键词：水分；燃烧特性；孔隙结构；煤泥 |
