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Combustion characteristics of high ash coal in a pulverized coal combustion test furnace

机译：煤粉燃烧试炉中高灰煤的燃烧特性

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At present, bituminous coal is used in thermal power stations in Japan. Since the demand for coal utilization is increasing worldwide, low rank coal, which is rich in moisture or ash, will be a major resource for thermal power plants in the near future. Problems in the utilization of high ash coal include not only the large amount of ash discharge, but also the difficulty of ignition and control of NO{sub}x formation. This paper describes the influence of ash content on pulverized coal combustion characteristics by using three kinds of high ash coal with similar combustible components, the same fuel ratio and elements of carbon and hydrogen on the dry ash free basis, but a different ash content (36, 44 and 53 wt%), in a pulverized coal combustion test furnace (coal combustion capacity; 100 kg/h). The test results showed NO{sub}x concentration at the furnace exit became high and combustion efficiency decreased with the increase of ash content in the standard combustion condition (An air ratio of 1.24 and a ratio of air volume for two-stage combustion to the total one at 0 %). O{sub}2 consumption occurred late and NO{sub}x formation and reduction were delayed in the flame. It was considered that the delay of O{sub}2 consumption was due to the covering of combustible matter with ash and the large sensible heat of the ash. In two-stage combustion, O{sub}2 consumption occurred much later and NO{sub}x reduction region before the air injection port in two-stage combustion became narrow for the high ash coal. As the ash content increased, NO{sub}x reduction in two-stage combustion decreased and the increase of the uncombustion fraction in two-stage combustion became high.
机译：目前，沥青煤用于日本的热电站。由于煤炭利用的需求正在全球增加，因此富含水分或灰分的低级煤将是在不久的将来的热电厂的主要资源。利用高灰煤的存在问题不仅包括大量的灰分排放，还包括点火和控制的难度和No {sub} x形成。本文介绍了采用三种高灰煤粉煤燃烧特性对具有相似可燃组分的粉煤燃烧特性的影响，在干灰的干燥灰分中相同的燃料比和碳和氢的元素，但灰分含量（36 ，44和53wt％），在粉煤燃烧试验炉中（煤燃烧能力; 100 kg / h）。试验结果显示炉子出口下的{亚} X浓度变得高，燃烧效率随着标准燃烧条件（空气比为1.24的空气比率和两级燃烧的空气量与两级燃烧的空气量的比率而降低。总为0％）。 o {sub} 2发生消耗迟到，没有{sub} x形成和减少在火焰中延迟。据认为，O {Sub} 2消耗的延迟是由于灰色可燃物质和灰分的大型明智的热量覆盖。在两级燃烧中，o {sub} 2消耗稍后发生，并且在两级燃烧中的空气喷射口之前的空气喷射口为高灰煤缩小之前的{sub} x减少区域。随着灰分含量的增加，两级燃烧中的{Sub} x降低降低，两级燃烧中的非乳化部分的增加变高。

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