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Pressure Drop Correlation Covering Dilute to Dense Regimes of Solid Particle-Gas Flow in a Vertical Conveying Pipe
Y. Bindar, N.A. Sutrisniningrum & D. Santiani
More general correlations between pressure drop and gas-solid flow variables are developed from the present experimental data. The correlation was modeled for a pneumatic conveying system in a vertical pipe. The transition boundary between dense and dilute regimes is constructed from the pressure drop correlations. The gas-solid particle flow variables are quantified by the gas Reynolds (Nref) and the solid Froude (Frp) numbers. The dense flow regime is indicated by the decrease of the pressure drop with the increase of the gas Reynolds number. In contrary, the dilute regime exhibits the increase of the pressure drop with the gas Reynolds number. The proposed correlations were built at the range of gas Reynolds number f from 360 to 500 and solid Froude number from 0,01 to 0,02.
BELT CONVEYOR DESIGN CRITERIA WITHIN ANGLO AMERICAN
J. Page, Divisional Mechanical Engineer,
G. Shortt, Design Engineer, Anglo American Corp
Belt conveyors for Anglo American mines are mostly designed within the corporation. An internal code of practice serves as a reference for the economic design of conveyors. The current design method is based on GOODYEAR but also incorporates aspects of CEMA and ISO 5048. It is similar to that used by many other designers since the early 1970's. AAC has developed, and continues to develop, its own manufacturing and performance specifications for pulleys, idlers and steel-cord belting. Independent design comparisons have shown that, on balance, AAC's conveyors are economically designed. Preliminary field testing shows a good correlation between measured and design powers.
The Design of High Speed Belt Conveyors
G. Lodewijks, The Netherlands.
This paper discusses aspects of high-speed belt conveyor design. The capacity of a belt conveyor is determined by the belt speed given a belt width and troughing angle. Belt speed selection however is limited by practical considerations, which are discussed in this paper. The belt speed also affects the performance of the conveyor belt, as for example its energy consumption and the stability of it's running behavior. A method is discussed to evaluate the energy consumption of conveyor belts by using the loss factor of transport. With variation of the belt speed the safety factor requirements vary, which will affect the required belt strength. A new method to account for the effect of the belt speed on the safety factor is presented. Finally, the impact of the belt speed on component selection and on the design of transfer stations is discussed.
DESIGN AND SIZING OF SCREW FEEDERS
Marco Bortolamasi , Johannes Fottner
This paper is concerned with the design criteria of screw feeders: a non proper design and selection of this device, which is present in large part of industrial processes, could mean poor performances, excessive power, severe wear of plant and degradation of the conveyed material.