Integrated Gas and Solid Model to Determine the Flow Performance in the SCR Reactor

Abstract

In order to resolve the problem of the catalyst deactivation caused by fly ash in selective catalytic reduction (SCR) denitration systems, this work proposes a deflector at the economizer outlet and an ash blocking device at the ash hopper outlet. New integrated models are developed to analyze the gas and solid flow field in a SCR reactor. The particle image velocimetry (PIV) experiment is used to validate the models. It is found that the flow field distribution and velocity variation trend calculated by different integrated models are basically consistent and are in good agreement with PIV test results. The G&T-collision–deposition model has better applicability in calculating the fly ash deposition rate. The influence of different internals on flow field and fly ash distribution is also compared. It is found that the H-shaped square steel has the worst rectification effect, which would aggravate the abrasion of fly ash on the catalyst and equipment. The curved deflectors effectively improve the distribution of fly ash and show the best rectification effect.

Introducing the I&ECR Virtual Collection of Industrial and Industrially Relevant Research (2022–2023)

“…Thermodynamics, Transport, and Fluid Mechanics is the topic area in I&ECR with the highest rate of participation of industrial authors as a percentage of the articles published. The collection includes a study on thermodynamic performance of three different autothermal chemical gas looping operation modes, the extrusion of polyacrylonitrile fibers using a very high L/D extruder (recognized with a cover in May 2023), description of mass transfer in gas–liquid flow, a kinetic model for CO 2 adsorption on amine-functionalized MOFs, description of microbubble transport in stirred reactors, two articles using computational fluid dynamics, , and a view on the future of thermodynamics following the results of an industrial survey …”