COMPUTATIONAL ANALYSIS OF THE IMPACT OF BOUNDARY CONDITIONS ON A PARTICLE-LADEN FLOW: A CASE STUDY IN A PRESSURIZED OXY-COAL COMBUSTOR

Author:

Li Lei,Akkerman V'yacheslav,Yang Zhiwei,Magalhaes Duarte ,Axelbaum Richard L.

Abstract

Designing an effective burner is vital for the development of coal combustion technologies. Because of high pressure, the volumetric fraction of the coal particles in the injected fuel in a pressurized oxy-combustion (POC) burner approaches or even exceeds the limitations allowed by the commercial computational fluid dynamics codes (e.g., Ansys Fluent). Consequently, for such high particle volumetric fractions, the interplay between the particles, the fluid flow, and the burner wall needs to be re-evaluated. The present computational work is a first step in a systematic analysis of the roles of various characteristics involved in the POC process, such as the method of particle release, its location, and the particle size. Specifically, pulverized coal is burned under an elevated pressure of 15 bar in an O<sub>2</sub>/CO<sub>2</sub> environment. A 100 kW, a POC combustor, is modeled with Ansys Fluent using the Reynolds-averaged Navier-Stokes approach. It is revealed that for this pilot-scale, pressurized burner, the gas phase flow velocity in the near-wall region exhibits anomalies. With the major focus on POC, this work aims to eliminate/reduce the impact of high particle loading on the gas-phase flow. To scrutinize the role of particle loading in the near-wall region and eliminate the impact of this velocity on POC downstream, the particle-gas interplay in the boundary layer is investigated by means of the computational simulations incorporating the coupling between the turbulent flow and the particles. It is found that the tuning of the particle release location makes the gas-phase flow velocity in the presence of particles consistent with the pure gas flow velocity profile. The particles size is also found to have a significant impact on the particle trajectory.

Publisher

Begell House

Subject

Pollution,Energy Engineering and Power Technology,Automotive Engineering

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. INVESTIGATION OF THERMAL RADIATION UNDER PRESSURIZED OXY-COMBUSTION CONDITIONS;International Journal of Energy for a Clean Environment;2024

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