2026-04-13T07:27:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1901412025-07-16T23:14:07Zcom_2072_1033col_2072_452949

Development of methods for reducing the volume of aspiration during overloads of granular materials Averkova, O.A. Logachev, I.N. Logachev, K.I. Tolmacheva, E.I. Uvarov, V.A. Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits Finite element method Coupled problems (Complex systems) -- Numerical solutions Aspiration, bulk material transfer, air suction Elements finits, Mètode dels The schemes of aspiration of elevator overloads have been developing. Balance equations of ventilation of aspiration covers are compiled. The system of equations for determination of the volumes of ventilating air for a standard node overload are formulated and solved. Ways of reducing productivity of aspiration systems are offered and analytically substantiated. Three bypass channels can be used to reduce aspiration volumes in elevator handling facilities by maintaining a smaller negative pressure inside unaspirated cowls of the elevator feeder and head. Airflows can be quantitatively decomposed using combined equations describing pressure losses in loops of a proposed aerodynamic equivalent for the assembly. These combined non-linear equations have been solved numerically using a specially developed algorithm based upon joint application of iterative and bisection procedures. Analysis of the findings for a “standard” elevator indicates that reduction in flow rates of air entering through leakage areas of unaspirated cowls is maximized when two bypass connections are installed: the lower one, connecting feeder cowl with a buffer chamber upstream of elevator boot cowl, and the upper one, connecting elevator head cowl with the inner chamber of a double-walled cowl of the upper (receiving) conveyor. The total flow rate in the case reviewed was 1.37 times lower than (a corresponding aspiration case with identical process and design parameters of the assembly, but with no bypass ducts). The effect cited may differ from the actual effect in every particular case. The computer program developed for the purpose can be used to provide a design-stage estimate. 2019 Conference report 978-84-949194-5-9 https://hdl.handle.net/2117/190141 eng Open Access 12 p. application/pdf CIMNE