Computational Fluid Dynamics Modeling for Urea Hydrolysis in a Batch Reactor for Flue Gas Conditioning

Abstract

A computational fluid dynamics (CFD) model is proposed to simulate urea hydrolysis for ammonia synthesis as a safe feed stock to flue gas conditioning in thermal power plants. A series of parametric studies to investigate flow rates, thermal boundary conditions, and reactor geometry was performed and operating conditions and reactor geometry were optimized. Detailed 3D flow, heat, and chemistry simulations of ammonia were carried out with predicted conversions comparable to measurements and the dependence of the experiments on the reaction parameters was evaluated. Through simulation under the same conditions the output was generated and compared to the experimental plot. Profiles of temperature and flow patterns were successfully achieved through simulation.

Urea Decomposition and Implication for NOx Reduction with Cu‐Zeolite and Vanadia‐Selective Catalytic Reduction

“…Therefore, the effect of urea decomposition on the NO x reduction performance of different SCR requires further research, especially under low-temperature conditions where the effect of intermediate products of urea decomposition need to be taken into consideration for SCR catalysts [10]. Additionally, the urea droplet spreading dynamics and decomposition kinetic models are usually derived based on experimental measurements from laboratory reactor benches [10][11][12]. It would be more desirable if the kinetic parameters used to simulate and design diesel engine exhaust after-treatment systems were extracted directly from on-engine experiments.…”

Flue gas conditioning by in situ oxidation of so2 applying dielectric barrier discharge

“…Some FGC technologies had been developed by introducing electric materials into flue gas to reduce the SR of FA particles. [6] Ammonia gas conditioning was used in the petroleum industry for the capture of catalyst dust with a typical dosage of ammonia ranging from 50 to 60 ppm. [7] Sulfur trioxide is by far the most common type of FGC.…”