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Numerical investigation of the combustion process for design and non-design coal in T-shaped boilers with swirl burners

机译：带旋流燃烧器的T型锅炉中设计煤和非设计煤燃烧过程的数值研究

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摘要

In this paper, we present the results of a numerical investigation into the combustion process in a boiler furnace chamber with swirl burners using design coal (non-coking coal) and substitute coal (coking coal). The paper describes the development of a three-dimensional combustion model for coal burning in a boiler furnace chamber. The utility boiler operates on high-ash non-coking coal with an ash content of 41.94%. Due to the high ash content in the design coal, most of it is released into the atmosphere, which negatively affects the environment and the surrounding area. We suggest that this coal by a different coal with a lower ash content. It was found that during the combustion of substitute coal at the level of burner, the temperature in the entire cross section increases by 200 K, due to more intense fuel burnout at the outer boundary of the burner torches. It is found that the substitute coal may be burned in the boiler furnace chamber and can provide reliable operation if the swirl burner angle is set at 50 degrees for the secondary air and at 45 degrees for the fuel-air mixture. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在本文中，我们介绍了使用设计煤（非焦煤）和替代煤（焦煤）对带有旋流燃烧器的锅炉炉膛内燃烧过程进行数值研究的结果。本文描述了锅炉燃烧室中煤燃烧的三维燃烧模型的开发。电站锅炉使用高灰分非焦煤运行，灰分含量为41.94％。由于设计煤中的高灰分含量，大部分灰分释放到大气中，对环境和周围地区产生负面影响。我们建议将这种煤改为灰分含量较低的另一种煤。发现在燃烧器水平处的替代煤燃烧期间，由于在燃烧器炬的外边界处更强烈的燃料烧尽，整个横截面的温度增加了200K。已发现，如果将二次空气的旋流燃烧器角度设置为50度，将燃料-空气混合物的旋转角度设定为45度，则替代煤可能会在锅炉炉膛中燃烧，并且可以提供可靠的运行。 （C）2019 Elsevier Ltd.保留所有权利。

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