Abstract The pressurized entrained-flow gasification is the most efficient and promising technology for utilization of lignite, where dense-phase pneumatic conveying under high pressure is one of the key techniques. The study aims at clarifying the conveying mechanisms of dense-phase pneumatic conveying of pulverized lignite in horizontal pipe under high pressure. For this purpose, bulk density of pulverized lignite with different moisture content was measured and analyzed, and the quantitative relationship between interparticle cohesion/cohesive forces and the moisture content was obtained. On the basis of this quantitative relationship, Mohr-Coulomb yield criterion was introduced to quantify particle flowability, and Castellanos's model was introduced to evaluate the fluidization characteristics. Combined with particle flowability and the fluidization quality, the conveying mechanisms of dense-phase pneumatic conveying of pulverized lignite in horizontal pipe under high pressure were explored. Results indicated that when the supplementary gas flow rate rises, the conveying capacity becomes weak, and the conveying resistance shows a decreasing firstly and then increasing tendency. While when the moisture content rises, the conveying capacity becomes weak, the conveying resistance strengthens, and the conveying stability weakens.

中文翻译：

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高压下水平管内褐煤粉密相气力输送的输送机理

摘要 加压气流气化是褐煤最高效、最有前景的利用技术，其中高压密相气力输送是其中的关键技术之一。研究旨在阐明高压下水平管内褐煤粉密相气力输送的输送机理。为此，对不同含水量的褐煤粉的堆积密度进行了测量和分析，得到了颗粒间内聚力/内聚力与含水量之间的定量关系。在此定量关系的基础上，引入Mohr-Coulomb屈服准则对颗粒流动性进行量化，并引入Castellanos模型对流化特性进行评价。结合颗粒流动性和流化质量，探讨了褐煤粉在高压下水平管内密相气力输送的输送机理。结果表明，当补气流量增加时，输送能力变弱，输送阻力呈先减小后增大的趋势。而当含水率升高时，输送能力变弱，输送阻力增强，输送稳定性减弱。输送阻力呈先减小后增大的趋势。而当含水率升高时，输送能力变弱，输送阻力增强，输送稳定性减弱。输送阻力呈先减小后增大的趋势。而当含水率升高时，输送能力变弱，输送阻力增强，输送稳定性减弱。