Abstract
Comparative strength analysis of two popular options of the radial centrifugal fan impeller design used in horizontal conveyor dryer for fine-grained raw materials is presented. Three types of materials for impeller manufacturing—ASTM A36 steel, Hardox 450 steel and aluminium alloy 6061-T6 are considered. The finite element method (FEM) has been used to investigate stresses and deformations of the impeller within the operational speed range. Analysis shows that the better design is the impeller made of Hardox 450 steel with a central disk. Although the maximum stress is slightly higher in the blades slot for central disk fitting for this design option, it has greatly reduced stresses in contact edges with two other disks (by 22–38%) and blades bending deformation (by 51%). For this design, the maximum operational rotation speed is 1135 min according to the yield strength with a 15% safety factor, while for basic design, it is 1225 min. The rational choice of material depends on maximum value of the yield stress to density ratio as well as taking into account the operating conditions and required fan performance. Recommendations for manufacturing the centrifugal fan impeller related to chosen material are given.
Highlights
In the mining, metallurgical, chemical and agricultural industries, precise humidity control of raw material is highly important, in both the intake and processing stages
For impeller design with an additional central disk, the maximum stress at the junction of the blades with the rear disk is 458 MPa that is 22% less than for basic design (590 MPa)
Calculations of maximum stress at the blade slot for central disk fitting showed that the fan has a maximum rotation speed of 1135 min−1 while the basic design has 1225 min−1 according to the yield strength with a 15% safety factor
Summary
Metallurgical, chemical and agricultural industries, precise humidity control of raw material is highly important, in both the intake and processing stages. This type of equipment is used for low-temperature drying +250 ◦C) of bulk materials requiring careful transportation during moisture removal. Such operation, for example, is included in briquetting various types of fine-grained raw materials (coal sludge of mines, coke breeze, rolling mill scale, ferroalloy screenings, etc.) produced on roller presses [6,7,8,9,10]. In the process of drying, excessive moisture is evaporated and briquettes are hardened
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