In situ experimental study on the combustion characteristics of captured chars on the molten slag surface

Shen Zhongjie; Liang Qinfeng; Xu Jianliang; Zhang Binbin; Han Dong; Liu Haifeng

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In situ experimental study on the combustion characteristics of captured chars on the molten slag surface

机译：熔渣表面捕获的焦炭燃烧特性的原位实验研究

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Captured char particles on the molten slag continue to burn or transform into residual carbon in a slagging combustor or furnace, which affect the complete carbon conversion. This study applied a high temperature stage microscope to investigate the combustion behavior of captured chars on the molten slag surface. The combustion process of captured chars with air on the slag surface was observed and recorded, compared to the original char combustion. Particle size evolution calculated from the measured cross section area versus time indicated that the burnout time of chars was prolonged on the molten slag surface. Besides the heat transfer analysis also showed that the temperatures of char particles on the molten slag were decreased due to the thermal conduction between char and slag. Molten slag layer reduced the char reactivity from the analysis of combustibility index, indicating the captured char combustion on the molten slag surface was hindered. Coupled with heat transfer analysis, shrinking particle model (SPM) was applied and modified to predict the combustion time at carbon conversion of 0.9, and results showed an agreement with the experimental data. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

机译：熔融炉渣上捕获的炭颗粒继续在炉渣燃烧器或熔炉中燃烧或转化为残留碳，这会影响碳的完全转化。这项研究使用高温台显微镜来研究捕获的炭在熔渣表面的燃烧行为。与原始的焦炭燃烧相比，观察并记录了渣表面上有空气的捕获焦炭的燃烧过程。由测量的横截面积对时间的计算得出的粒度变化表明，炭渣在熔渣表面的燃尽时间延长了。此外，传热分析还表明，由于炭和炉渣之间的热传导，熔融炉渣上的炭颗粒温度降低了。从可燃性指数分析来看，熔渣层降低了焦炭反应性，表明阻碍了在熔渣表面上捕获的焦炭燃烧。结合传热分析，应用收缩颗粒模型（SPM）进行修正，以预测碳转化率为0.9时的燃烧时间，结果与实验数据吻合。（C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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来源
《Combustion and Flame》 |2016年第4期|333-342|共10页
作者
Shen Zhongjie; Liang Qinfeng; Xu Jianliang; Zhang Binbin; Han Dong; Liu Haifeng;
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作者单位

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, POB 272, Shanghai 200237, Peoples R China|E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;

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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);
原文格式 PDF
正文语种 eng
中图分类
关键词
Coal; Char; Slag; Combustion; Heat transfer; Shrinking particle model;

机译：煤;焦炭;炉渣;燃烧;传热;收缩颗粒模型;

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专利

1. In situ study on the formation mechanism of bubbles during the reaction of captured chars on molten slag surface [J] . Zhongjie Shen, Qinfeng Liang, Jianliang Xu, International Journal of Heat and Mass Transfer . 2016,第APRa期

机译：熔渣表面捕获的焦炭反应过程中气泡形成机理的原位研究
2. In-situ experimental study of CO2 gasification of char particles on molten slag surface [J] . Shen Zhongjie, Liang Qinfeng, Xu Jianliang, Fuel . 2015,第nova15期

机译：熔渣表面焦炭颗粒CO2气化的原位实验研究
3. A model of char capture by molten slag surface under high-temperature gasification conditions [J] . Tadaaki Shimizu, Hiroaki Tominaga Fuel . 2006,第2期

机译：高温气化条件下熔渣表面捕获焦炭的模型
4. A model of char capture by molten slag surface under high-temperaturegasification conditions [C] . Tadaaki Shimizu, Hiroaki Tominaga Annual International Pittsburgh Coal Conference (PCC) . 2004

机译：高温气化条件下熔渣表面捕获焦炭的模型
5. Experimental and theoretical study of submicrometer particle formation and capture mechanisms in coal combustion environments. [D] . Zhuang, Ye. 2000

机译：煤燃烧环境中亚微米级颗粒形成和捕获机理的实验和理论研究。
6. Numerical and experimental study of pyrophoric activated metal Mg surface combustion characteristics [O] . Hesong Huang, Zhongxiang Tong, Chaozhe Wang, 2018

机译：自燃活性金属镁表面燃烧特性的数值与实验研究
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

In situ experimental study on the combustion characteristics of captured chars on the molten slag surface

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