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The Influence of Heat Transfer Conditions on the Parameters Characterizing the Ignition of Coal-Water Fuel Particles

机译：传热条件对煤水燃料颗粒点火特性参数的影响

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The future of thermal power engineering both in Russia and abroad will depend in many respects on the use of coal as main fuel for generating heat and electricity. In this connection, matters concerned with development and introduction of new environmentally friendly and energy efficient coal firing technologies are becoming of much importance. Firing coal in the form of coal-water fuel is one of the most promising solutions. However, despite a rather long history of its development (more than 40 years), this technology has not found wide use as yet, which in all likelihood is due to lack of full mathematical and physicochemical models describing the processes that take place when a coal-water fuel particle undergoes thermal treatment and ignition. The article presents the results obtained from numerical solution of the coal-water fuel particle ignition problem taking into account simultaneously occurring main thermal treatment processes (thermal conductivity, water evaporation, filtration heat and mass transfer, thermal decomposition of the fuel organic part, and thermochemical interaction between water vapor and coke carbon). The ignition problem is solved using the finite difference method. For calculating the evaporation process taking into account nonequilib-rium nature of the parameters at the interface boundary of the initial "coal-water fuel—dry coal" system, the method of capturing the phase transition front at the difference mesh node was used. The results obtained from numerical modeling were used for determining the conditions and parameters characterizing the ignition of coal-water fuel particles under the conditions typically existing in the furnace space of boiler units. The extent to which radiant heat transfer influences the ignition delay time is determined. It is shown that radiant heat transfer plays a determining role in the thermal preparation of fuel for ignition.
机译：俄罗斯和国外火电工程的未来将在许多方面取决于以煤炭为主要燃料产生热量和电力。在这方面，与开发和引进新的环保和节能燃煤技术有关的问题变得越来越重要。以水煤燃料形式燃煤是最有希望的解决方案之一。然而，尽管其发展已有相当长的历史（超过40年），但该技术尚未得到广泛应用，这很可能是由于缺乏描述煤发生时的过程的完整数学和物理化学模型的缘故-水燃料颗粒经过热处理和点火。本文介绍了从煤-水燃料颗粒着火问题的数值解得到的结果，其中考虑了同时发生的主要热处理过程（导热性，水蒸发，过滤传热和传质，燃料有机物的热分解以及热化学反应）水蒸气和焦炭之间的相互作用）。使用有限差分法解决了点火问题。在考虑初始“煤-水-干煤”系统界面边界参数的非平衡性质来计算蒸发过程时，使用了在差分网格节点处捕获相变前沿的方法。从数值模型获得的结果用于确定在锅炉单元的炉腔中通常存在的条件下表征水煤燃料颗粒着火的条件和参数。确定辐射热传递对点火延迟时间的影响程度。结果表明，辐射热传递在燃料的热制备中起着决定性的作用。

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