Effect of nozzle fan angle on sprays in gas-solid riser flow--颗粒学报PARTICUOLOGY

Qureshi, M. M. R., Zhu, C., Lin, C.-H., & Fan, L.-S. (2006). Effect of nozzle fan angle on sprays in gas-solid riser flow. China Particuology, 4(3), 147–152. https://doi.org/10.1016/S1672-2515(07)60254-1

Effect of nozzle fan angle on sprays in gas-solid riser flow

Muhammad M.R. Qureshi ^a, Chao Zhu ^a *, Chao-Hsin Lin ^b, Liang-Shih Fan ^c

a Department of Mechanical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
b Environmental Control Systems, Boeing Commercial Airplanes Group, Seattle, WA 98124, USA
c Department of Chemical Engineering, Ohio State University, Columbus, OH 43210, USA

10.1016/S1672-2515(07)60254-1

Volume 4, Issues 3–4, July 2006, Pages 147-152

Received 30 October 2005, Accepted 12 April 2006, Available online 27 November 2007.

E-mail: chao.zhu@njit.edu

Highlights

Abstract

A three-dimensional simulation study is performed for investigating the hydrodynamic behaviors of a cross-flow liquid nitrogen spray injected into an air-fluidized catalytic cracking (FCC) riser of rectangular cross-section. Rectangular nozzles with a fixed aspect ratio but different fan angles are used for the spray feeding. While our numerical simulation reveals a generic three-phase flow structure with strong three-phase interactions under rapid vaporization of sprays, this paper tends to focus on the study of the effect of nozzle fan angle on the spray coverage as well as vapor flux distribution by spray vaporization inside the riser flow. The gas-solid (air-FCC) flow is simulated using the multi-fluid method while the evaporating sprays (liquid nitrogen) are calculated using the Lagrangian trajectory method, with a strong two-way coupling between the Eulerian gas-solid flow and the Lagrangian trajectories of spray.

Our simulation shows that the spray coverage is basically dominated by the spray fan angle. The spray fan angle has a very minor effect on spray penetration. The spray vaporization flux per unit area of spray coverage is highly non-linearly distributed along the spray penetration. The convection of gas-solid flow in a riser leads to a significant downward deviation of vapor generated by droplet vaporization, causing a strong recirculating wake region in the immediate downstream area of the spray.

Graphical abstract

Keywords

numerical simulation; spray; evaporation; fan angle; circulating fluidized bed

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