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首页> 外文期刊>Fuel >Carbon Particle Type Characterization Of The Carbon Behaviour Impacting On A Commercial-scale Sasol-lurgi Fbdb Gasifier
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Carbon Particle Type Characterization Of The Carbon Behaviour Impacting On A Commercial-scale Sasol-lurgi Fbdb Gasifier

机译：影响商业规模的Sasol-lurgi Fbdb气化炉的碳行为的碳颗粒类型表征

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Char-form analysis, whilst not yet an ISO standard, is a relatively common characterization method applied to pulverized coal samples used by power utilities globally. Fixed-bed gasification coal feeds differ from pulverized fuel combustion feeds by nature of the initial particle size (+6 mm, -75 mm). Hence it is unlikely that combustion char morphological characterization schemes can be directly applied to fixed-bed gasifier chars. In this study, a unique carbon particle type analysis was developed to characterize the physical (and inferred chemical) changes occurring in the particles during gasification based on coal petrography and combustion char morphology. A range of samples sequentially sampled from a quenched commercial-scale Sasol-Lurgi fixed-bed dry-bottom (FBDB) Gasifier were thus analysed. It was determined that maceral type (specifically vitrinite and inertinite) plays a pivotal role in the changes experienced by carbon particles when exposed to increasing temperature within the gasifier. Whole vitrinite particles and vitrinite bands within particles devolatilized first, followed at higher temperatures by reactive inertinite types. By the end of the pyrolysis zone, all the coal particles were converted to char, becoming consumed in the oxidation/combustion zone as the charge further descended within the gasifier. The carbon particle type results showed that both the porous and carbominerite char types follow similar burn-out profiles. These char types formed in the slower pyrolysis region within the pyrolysis zone, increasing to around 10% by volume within the reduction zone, where 53% carbon conversion occurred. Both of these char forms were consumed by the time the charge reached the ash-grate at the base of the reactor, and therefore did not contribute to the carbon loss in the ash discharge. It would appear as if the dense char and intermediate char types are responsible for the few percent carbon loss that is consistently obtained at the gasification operations. The carbon particle type analysis developed for coarse coal to the gasification process was shown to provide a significant insight into the behaviour of the carbon particles during gasification, both as a stand alone analysis and in conjunction with the other chemical and physical analyses performed on the fixed-bed gasifier samples.
机译：炭型分析虽然还没有成为ISO标准，但它是一种相对普遍的表征方法，适用于全球电力公司使用的煤粉样品。固定床气化煤进料与粉状燃料燃烧进料的不同之处在于初始粒径（+6毫米，-75毫米）。因此，燃烧炭的形态表征方案不可能直接应用于固定床气化炉炭。在这项研究中，开发了一种独特的碳颗粒类型分析，以表征基于煤岩学和燃烧炭形态的气化过程中颗粒中发生的物理（和推断的化学）变化。因此，分析了一系列从骤冷的商业规模Sasol-Lurgi固定床干底（FBDB）气化炉中采样的样品的范围。已确定，当暴露于气化炉内温度升高时，黄铁矿类型（特别是镜质体和惰质体）在碳颗粒经历的变化中起关键作用。整个镜质体颗粒和颗粒中的镜质体带首先挥发掉，然后在更高的温度下发生反应性惰质类型。到热解区结束时，随着进料在气化炉中的进一步下降，所有煤颗粒都转化为炭，在氧化/燃烧区被消耗掉。碳颗粒类型的结果表明，多孔炭和碳锰矿炭类型都遵循相似的燃尽曲线。这些焦炭类型在热解区中较慢的热解区中形成，在还原区（按体积计发生碳转化的53％）内增加至约10％（体积）。当装料到达反应器底部的灰炉栅时，这两种焦炭形式都被消耗掉了，因此对灰分排放中的碳损失没有贡献。看起来，稠密的焦炭和中间的焦炭类型是导致在气化操作中始终获得的少量碳损失的原因。研究表明，为粗煤进行气化过程而进行的碳颗粒类型分析可提供对气化过程中碳颗粒行为的重要见解，既可作为独立分析，也可与对固定煤进行的其他化学和物理分析相结合床气化炉样品。

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