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Gravity Flow of Solids Engineering Databook. Volume 1. Analysis of Pressurization of Lock Hoppers and Typical Measured Flow Properties of Coal. Final Technical Report Phase 2

机译：固体工程数据手册的重力流。第1卷。闸斗增压分析及煤的典型实测流量特性。最终技术报告第2阶段

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Flow properties were determined for coal, limestone and ash of typical types, sizes and moisture contents to be handled at temperatures less than 300 deg F and gas pressures less than 750 psig. The pressurization stage of a lock hopper handling a frictional-cohesive bulk material is analyzed in pseudo two dimensional space and time for plane flow and axially symmetric conical hoppers to determine proper pressurization conditions to avoid obstructions to flow upon discharge. A system of two nonlinear partial differential equations are derived for the effective solids stress and interstitial fluid pressure fields. Significant coupling between the two fields exists. For converging channels, the effective solids stress field equation utilizes a constant ratio of wall normal stress to average vertical stress of a horizontal cross section. This ratio is computed from ''radial'' plastic flow stress fields of A.W. Jenike. The fluid pressure field equation describes the transient diffusive flow of a compressible fluid through the interstices of the bulk solid using a modified Darcy's law to describe the flow of the fluid driven by fluid pressure gradients. For the problem of rapid pressurization of lock hoppers, the stress and pressure field equations are solved numerically using a superminicomputer to predict the effect of pressurization rate, lock hopper geometry, location of gas injection port(s), bulk solid flow properties, permeability, and wall friction upon the consolidating stress caused by gas pressure gradients acting on the bulk solid during the pressurization process. Computations suggest that the optimum location of pressurization ports are at both the top and bottom of the cylindrical portion of the lock hopper. The optimum pressurization rate with time is such that only slow rates are permissible for the first few atmospheres and the rate may be gradually increased as pressurization proceeds. 45 refs., 82 figs., 25 tabs. (ERA citation 12:003338)

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Royal, T. A.;
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年度 1986
页码 1-340
总页数 340
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Ashes; Coal; Hoppers; Limestone; Pressurizing; Solids Flow; Computer Calculations; Design; Experimental Data; High Temperature; Materials; Mathematical Models; Medium Pressure; Moisture; Particle Size; Pressure Effects; Temperature Effects; Time Dependence;

机译：灰烬;煤;料斗;石灰石;加压;固体流动;计算机计算;设计;实验数据;高温;材料;数学模型;中压;水分;粒径;压力效应;温度效应;时间依赖性;

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4. Gravity Flow of Solids Engineering Databook, Volume 2. Analysis of Pressurization of Lock Hoppers and Typical Measured Flow Properties of Coal. Final Technical Report Phase 2 [R] . Royal, T. A. 1986

机译：固体重力流工程数据手册，第2卷。闸斗加压分析和煤的典型测量流动特性。最终技术报告第2阶段

Gravity Flow of Solids Engineering Databook. Volume 1. Analysis of Pressurization of Lock Hoppers and Typical Measured Flow Properties of Coal. Final Technical Report Phase 2

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