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Determination of pneumatic transport capabilities of dry pulverised coal suitable for entrained flow processes

机译：确定适用于气流法的干粉煤的气动输送能力

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摘要

The use of pulverised coal in integrated gasification combined cycle (IGCC) power plant is currently under development. The results of a project to determine the suitability of Chinese coals for dry feed to the entrained flow gasifier that forms part of the above cycle are presented. This paper also includes some basic material characterisation of the pulverised coal. Pneumatic conveying test rigs were used in conjunction with a mathematical model to generate conveying characteristics for coal at high back pressures. The overall strategy was to test both coal and surrogate at atmospheric back pressure to compare the two materials' performance, under similar conveying conditions; and to test the surrogate material at elevated back pressure, and use this data to validate a mathematical model. The similarity of behaviours of the two materials then allowed the model to be applied to the data measured for coal and so generate conveying characteristics at conditions typical of entrained flow. The mathematical model used to scale the results to high back pressures, which characterise entrained flow processes, is based on the assumption that the influence of the pressure drop due to solids is independent of the back pressure, in the range of conditions considered. Conveying characteristics were generated at a variety of back pressures ranging from 1 to 25 bar. A brief analysis of the minimum conveying velocity is also presented.
机译：目前正在开发在整体气化联合循环（IGCC）电厂中使用粉煤的技术。给出了确定上述干式煤是否适合作为上述循环一部分的气流床气化炉干式进料的项目结果。本文还包括一些煤粉的基本材料表征。气动输送试验台与数学模型结合使用，可在高背压下生成煤炭的输送特性。总体策略是在大气背压下测试煤和替代煤，以比较两种材料在相似输送条件下的性能。并在升高的背压下测试替代材料，并使用此数据验证数学模型。然后，两种材料的行为相似性使得该模型可以应用于煤的测量数据，从而在典型的夹带流动条件下产生输送特性。用于将结果按比例缩放到高背压的数学模型是表征气流过程的基础，该模型基于以下假设：在所考虑的条件范围内，由于固体引起的压降的影响与背压无关。输送特性是在1至25 bar的各种背压下产生的。还介绍了最小输送速度的简要分析。

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