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首页> 外文会议>Proceedings of the ASME power conference 2009 >FOULING FORMATION IN 575 MW TANGENTIAL-FIRED PULVERIZED-COAL BOILER
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FOULING FORMATION IN 575 MW TANGENTIAL-FIRED PULVERIZED-COAL BOILER

机译：575 MW四角切圆煤粉锅炉的结垢

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摘要

Over the past years we have gained experience in employing varying types of coal fired in the same boiler. Consequently, we developed evaluation criteria regarding the operation of these coals. In the present study we evaluated fouling propensity of two bituminous South African coals Billiton-Prime and Anglo-Kromdraai (AKD). From an experimental work carried out in a 50 kW test facility where we obtained emissivity and thermal resistance of the two coal ashes. We also developed a new method for evaluating fouling in full-gcale utility boilers that is based on adhering of an ash particle depending on its temperature and velocity vector at the boundary layer of the water-walls. The flow and temperature fields were determined by computational fluid dynamic (CFD) simulations. We used the emissivity and thermal resistance determined from the test furnace in the CFD calculations to evaluate fouling in the combustion chamber of a 575 MW tangential-fired utility boiler When the two bituminous coals were fired. Mapping of the fouling locations that are mostly to occur were determined and this behavior fit the experience from the power station and data obtained for these two coals.
机译：在过去的几年中，我们获得了在同一锅炉中使用不同类型的燃煤的经验。因此，我们制定了有关这些煤运行的评估标准。在本研究中，我们评估了两种烟煤南非Billiton-Prime和Anglo-Kromdraai（AKD）的结垢倾向。通过在50 kW测试设备中进行的实验工作，我们获得了两种煤灰的发射率和热阻。我们还开发了一种新的评估全口径公用事业锅炉结垢的方法，该方法基于灰烬颗粒在水冷壁边界层的温度和速度矢量的粘附情况。通过计算流体动力学（CFD）模拟确定流场和温度场。我们使用在CFD计算中从测试炉确定的发射率和热阻来评估当燃烧两种烟煤时575 MW切向燃烧式电站锅炉燃烧室中的结垢。确定了最容易发生的结垢位置的映射，这种行为符合发电厂的经验以及针对这两种煤所获得的数据。

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