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Study on char deposition characteristics on the heat exchanger tube in a coal gasifier--relationship between char formation and deposition characteristics

机译：煤气化炉内换热管上的焦炭沉积特性研究-焦炭形成与沉积特性之间的关系

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摘要

In a coal gasifier and heat exchanger, adhered and deposited ash and char inhibit heat transfer making the stable operation of the gasifier difficult. Since heat transfer performance of the heat exchanger directly affects the output of Integrated Coal Gasification Combined Cycle plants, it is important to understand the effect of char on the characteristics of adhesion and deposition on the heat exchanger tube beforehand. However, very few studies have been conducted concerning the relationship between char's property and its adherability, which varies depending on the coal type and the operating conditions. In this study, we first conducted an analysis of the characteristics of heat transfer in the heat exchanger of the pilot plant gasifier to understand the effects of the properties of the char on the heat transfer in the heat exchanger. Using a bench-scale gasifier at CRIEPI, a transformation of the char morphology took place as the gasification reaction progressed. In the experiment, char from three distinct coal types was made to adhere on a plate and then allowed to re-entrain, so that the inter-particle adhesion strength of the char could be measured. Using the char from the same coals, deposition experiments on a horizontal tube placed in a drop tube furnace were also conducted to examine the mechanism of char adhesion on the heat exchanger tube.
机译：在煤气化炉和热交换器中，粘附和沉积的灰分和焦炭阻碍了热传递，这使得气化炉的稳定运行变得困难。由于热交换器的传热性能直接影响整体煤气化联合循环装置的输出，因此重要的是，事先了解炭对热交换器管上附着和沉积特性的影响。但是，关于炭的性质与其附着性之间关系的研究很少，这取决于煤的类型和操作条件。在这项研究中，我们首先对中试气化炉的热交换器中的传热特性进行了分析，以了解炭特性对热交换器中的传热的影响。使用CRIEPI的台式气化炉，随着气化反应的进行，焦炭形态发生了转变。在该实验中，将三种不同煤种的焦炭附着在板上，然后重新夹带，从而可以测量焦炭的颗粒间附着强度。使用来自相同煤的炭，还对放置在落管炉中的水平管进行了沉积实验，以检查炭在热交换器管上的粘附机理。

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