Physico-сhemical nanomaterials science
Methods for controlling the properties of nanoporous layers in granules of porous ammonium nitrate: stage of drying
N.O. Artyukhovа1, J. Krmela2, V. Krmelova3, A.E. Artyukhov4
1Processes and Equipment of Chemical and Petroleum Refinery Department, Sumy State University, Rymskogo-Korsakova str., 2, Sumy-40007, Ukraine. 
E-mail: n.artyukhova@pohnp.sumdu.edu.ua 
2 Department of Numerical Methods and Computational Modeling, Alexander Dubcek University of Trencin, 491/30, I. Krasku, 02001, Puchov, Slovak Republic
E-mail: jan.krmela@fpt.tnuni.sk 

3 Department of Materials Technologies and Environment, Alexander Dubcek University of Trencin, 491/30, I. Krasku, 02001, Puchov, Slovak Republic
E-mail: vladimira.krmelova@fpt.tnuni.sk 
4 Processes and Equipment of Chemical and Petroleum Refinery Department, Sumy State University, Rymskogo-Korsakova str.,  2, Sumy-40007, Ukraine. 
E-mail: a.artyukhov@pohnp.sumdu.edu.ua 

This work is devoted to the search for methods of controlling the formation of the nanoporous structure of ammonium nitrate granules (as a component of the industrial explosive of ANFO) during the dehydration stage. The influence of the design of multistage dryer's each stage on the features of a nanoporous layer formation process is shown. The length of the shelf contact, its angle of inclination, and the degree of perforation affect the residence time of the granules in the dryer (the formation time of the nanoporous layer after wetting with a solution). 
For such case it is important compliance with conditions under which the "hydrodynamic" residence time of granules in device working space must be at least "thermodynamic" time, which is determined by the kinetics of the process of removing moisture from granules [1]. 
This work was carried out under the project “Technological bases of multistage convective drying in small-sized devices with utilization and heat recovery units”, project No. 0120U100476.

1.	Artyukhov A. Application software products for calculation trajectories of granules movement in vortex granulator // CEUR Workshop Proceedings. – 2016.  – 1761 – P. 363-373.