Mathematical modeling and simulation of an industrial rotary dryer: A case study of ammonium nitrate plant

• Published in: Powder technology 2013-05, Vol.239, p.499-505
• Main Authors: Abbasfard, Hamed, Rafsanjani, Hasan Hashemipour, Ghader, Sattar, Ghanbari, Mehdi
• Format: Article
• Language: English
• Subjects: air; air temperature; ammonium nitrate; Ammonium nitrate plant; Applied sciences; case studies; Chemical engineering; drying; Drying kinetics; equations; Equilibrium moisture; Exact sciences and technology; fertilizer industry; heat; Heat and mass transfer. Packings, plates; mass transfer; Mathematical modeling; mathematical models; Miscellaneous; nitrogen fertilizers; Rotary dryer; simulation models; Solid-solid systems; water content
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2013.02.037

Drying of solids is of great significance in fertilizer industry as the quality of final product should meet the commercial required standards. A rotary dryer which has been investigated in the present study is used in ammonium nitrate (AN) plant located at Shiraz Petrochemical Complex (SPC). This plant is designed to produce 650metrictons of final products in a day. In this work, mathematical modeling of the concurrent rotary dryer for AN including heat and mass transfer equations between solid and air was developed. New correlations were proposed for AN equilibrium moisture and drying rate which were used in the modeling. The model was checked against the industrial data which showed a good agreement. The model predicts air and product moisture and temperature depending on working conditions of the rotary dryer. Regardless of the slope and speed of the dryer, inlet AN moisture and air temperature have been shown to be the variables that have the greatest effect, on the outlet moisture content of the product. Mathematical modeling of the concurrent rotary dryer for AN including heat and mass transfer equations between solid and air was developed. The model was checked against the industrial data which showed a good agreement. [Display omitted] •An industrial concurrent rotary dryer for drying of AN was modeled.•Differential equations including mass and energy conservation were developed.•The mathematical model performs well under the industrial conditions.•New correlations were proposed for AN equilibrium moisture and drying rate.