THE PARTITIONING OF IRON DURING THE COMBUSTION OF PULVERIZED COAL
THE PARTITIONING OF IRON DURING THE COMBUSTION OF PULVERIZED COAL
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DOI：
10.1016/0010-2180(94)00068-4
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发表时间：
1995-01-01
影响因子：
4.4
通讯作者：
WENDT, JOL
中科院分区：
文献类型：
--
作者：
BOOL, LE;PETERSON, TW;WENDT, JOL
对煤粉燃烧过程中铁的分配进行了实验研究和理论分析。重点是确定煤的变量和燃烧条件如何影响结渣前体的形成。实验工作包括燃烧一套六个良好的特征煤在空气动力学定义良好的17千瓦的下流燃烧室。用穆斯堡尔谱法测定了灰样中铁的形态。一个模型来预测分配的铁的煤和实验条件检查。该模型是基于黄铁矿氧化和铁捕获硅酸盐之间的竞争，并要求作为输入，CCSEM数据的矿物质在煤中的初始分布。它使用文献衍生的机制和动力学计算黄铁矿氧化和焦炭燃烧速率，连同一个新的玻璃形成机制，再加上目前的烧结知识。该模型只需要两个未知参数进行拟合，与26组实验数据吻合良好，涵盖了广泛的铁分配在飞灰。实验和理论结果都表明，单独从母煤中除去外来的铁，在消除锅炉中的炉渣形成方面可能不是很有效。
The partitioning of iron during pulverized coal combustion was investigated both experimentally and theoretically. Emphasis was on determining how coal variables and combustion conditions influenced the formation of slagging precursors. Experimental work consisted of burning a suite of six well-characterized coals in an aerodynamically well-defined 17 kW downflow combustor. Speciation of iron in collected ash samples was determined by Mossbauer Spectroscopy. A model was developed to predict the partitioning of iron for the coals and experimental conditions examined. The model was based on a competition between pyrite oxidation and iron capture by silicates and required as input, CCSEM data on the initial distribution of mineral matter in the coal. It used literature-derived mechanisms and kinetics to calculate pyrite oxidation and char combustion rates, together with a new glass formation mechanism, coupled with current knowledge of sintering. Requiring only two unknown parameters to be fitted, the model agreed well with 26 sets of experimental data, which covered a wide range of iron partitioning in the fly ash. Both experimental and theoretical results suggest that removal from the parent coal, of extraneous iron alone, may not be very effective in eliminating slag formation in boilers.