Večfazni numerični model razpršilnega sušenja suspenzije zeolit - voda : doktorska disertacija

slovenian

doktorska dela

2014

Univerza v Mariboru, Fakulteta za strojništvo

The contribution deals with drying of a porous particle, composed of wet zeolite 4A crystals, in the conditions prevailing inside a spray dryer. The existing numerical models within the engineering codes consider the moisture as a surface attached liquid and drying as one stage drying, which are leading to possible inaccuracies and incompleteness of computational results. Therefore, In view of upgrading the existing numerical models, a multi-phase drying model for drying of a porous particle was developed. It includes also the crystalline moisture, which in the drying process diffuses through the dried outer core of the particle. In the latter case, the Stefan type of mass transfer in form of one sided diffusion is used in second stage of drying while third stage of drying was developed on the basis of material characteristics, set by thermo gravimetric analyses. The results obtained from the numerical model were compared with experimental results, which show the applicability and physical correctness of the proposed model.

08.08.2023