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Investigation of ash deposition dynamic process in an industrial biomass CFB boiler burning high alkali and chlorine fuel

机译：工业生物量CFB锅炉烧结高碱碱和氯燃料中灰沉积动力过程的研究

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Biomass direct combustion for power generation is used widely in China. The circulating fluidized bed (CFB) boiler has a lower combustion temperature and a wide fuel adaptability, which is suitable for biomass combustion. The dynamic process of ash deposition in a CFB boiler is different from that in a grate furnace because it has a lower combustion temperature and a higher flue gas flow. In this work, the dynamic process of ash deposition on a superheater in a 50 MW biomass CFB boiler was studied by a deposit sampling system at different deposition times. Multiple deposit samples with different deposition times were observed and analysed to obtain an indication of deposit changes with time to understand the entire deposit build-up process. This study differs from previous studies on ash deposition and the deposition process could be identified as occurring in three stages: (1) initial deposition, (2) KCI deposition and (3) capturing of fly ash particles. In the first stage, the temperature gradient near the superheater led to the deposition of fine particles smaller than 2 μm from the flue gas through thermophoretic deposition. In the second stage, the surface became rough, which led to an increase in gas-phase KCl condensation rate and the formation of a dense and continuous KCl layer after the initial deposition. In the third stage, KCI provided a sticky layer to capture larger particles in the flue gas. Thus, more large particles were captured in the flue gas and the KCl continued to condense. As the surface temperature was increased, the condensation rate of the gas-phase KCl decreased. The higher surface temperature enhanced KCI melting and captured more fly ash particles, which led to a rapid build-up of ash deposits on the heating surfaces.
机译：生物量用于发电的直接燃烧在中国广泛使用。循环流化床（CFB）锅炉具有较低的燃烧温度和宽的燃料适应性，适用于生物质燃烧。 CFB锅炉中的灰分沉积的动态过程与炉炉炉中的灰沉积不同，因为它具有较低的燃烧温度和更高的烟道气流。在这项工作中，通过在不同沉积时间的沉积物采样系统中研究了50 MW生物量CFB锅炉过热器上的灰分沉积的动态过程。观察和分析具有不同沉积时间的多沉积样品，并随着时间来获得沉积物变化的指示，以了解整个存款积累过程。该研究与先前的灰分沉积研究不同，并且沉积过程可以被鉴定为三个阶段发生：（1）初始沉积，（2）KCi沉积和（3）捕获粉煤灰颗粒的捕获。在第一阶段，过滤器附近的温度梯度导致通过热沉积从烟道气中沉积小于2μm的细颗粒。在第二阶段，表面变得粗糙，导致气相KCL缩合速率的增加和在初始沉积之后形成致密和连续的KCl层。在第三阶段，KCI提供了粘性层以捕获烟道气中的较大颗粒。因此，在烟道气中捕获了更多大的颗粒，并且KCl继续冷凝。随着表面温度的增加，气相KCl的冷凝率降低。较高的表面温度增强了KCI熔化并捕获了更多的飞灰颗粒，这导致了加热表面上的灰沉积物的快速积聚。

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