粉体加压气固两相流动特性研究.doc

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南京航空航天大学
毕业设计
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粉体加压气固两相流动特性研究
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二〇一二年六月
南京航空航天大学
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粉体加压气固两相流动特性研究
摘要
煤炭是我国的基础能源和重要原料,但是,我国的煤炭利用技术相对落后,利用效率低,过程污染严重。开发煤炭高效、清洁利用和转化技术,是国民经济和社会可持续科学发展的客观需求,煤气化技术是煤炭高效清洁利用的核心技术,是煤化工技术的基础,高压超浓相煤粉气力输送是气流床煤粉加压气化的关键技术之一,高压超浓相煤粉输送中速度较低,固相浓度很高,流动形态复杂,流动稳定性下降,系统的输送技术要求和条件与一般输送系统相差较大。目前,高压超浓相煤粉输送可借鉴资料和经验很少,只能依赖对真实系统进行试验研究,获取其流动规律。
神经网络具有完善的理论体系,清晰的算法流程,强大的数据识别和模拟功能。在解决非线性系统问题时,优势明显,突显出巨大的实际应用价值。鉴于对高压超浓相气力输送特性参数机理建模的复杂性,将各种神经网络技术引入高压超浓相气力输送特性参数测试领域,研究了煤粉质量流量、固气比和煤粉粒径等条件对气力输送特性的影响,并对煤粉质量流量和固气比等进行预测,得到了较好的预测结果。
关键词:高压,气力输送,输送特性,固气比,神经网络
The Research of Solid-gas Flow on Pressurized Powder
Abstract
Coal is the basic energy and important raw materials in China. However, China’s technology of coal utilization is relatively backward and the efficiency is low. Developing clean and high-efficiency coal utilization is the objective needs of sustainable and scientific development. Coal gasification was the key technology for clean and high-efficiency coal utilization, and also the basis of the development of coal chemical processing. High-pressure and dense-phase pneumatic conveying of pulverized coal is of great importance for the entrained flow pulverized coal gasification. The transport is in low speed, high solid concentration plex mobility patterns. The technical requirements and condition of the conveying system is different with general conveying system. The reference information and experience is far from enough, the acquisition of the flow rule only rely on the experimental study of real system.
work has integrated system, explicit algorithmic process, data identification and simulation function. it also owns the excellent ability to solve nonlinear problem, therefore, the value of practical application is outstanding. Considering plexity of the mechanism modeling of the characteristic para