Advanced simulation of a 750 t/d municipal solid waste grate boiler to better accommodate feedstock changes due to waste classification
Artikel i vetenskaplig tidskrift, 2022

To better accommodate changes in municipal solid waste (MSW) properties due to waste classification, advanced computational fluid dynamics (CFD) simulations are carried out for a 750 t/d MSW moving-grate boiler. A moving-grate bed model is developed and iteratively coupled to the freeboard simulation which is performed in Ansys Fluent. The model is first validated by the measurement data for the daily operation case incinerating current feedstock. Then, the model is deployed to investigate the impacts of feedstock change and adjust boiler operation for better accommodating the new MSW. The results indicate incineration of the new MSW leads to irrational utilization of oxygen, non-uniform temperature distribution and low mixing, while maintaining current operation conditions. Subsequently, adjustments of air supply and thermal input are proposed and conducted by the model, which address the potential issues and benefit boiler operation and energy recycling. Finally, the uniformity of velocity and turbulent kinetic energy which indicates mixing, are compared for different cases. The latter is increased by 51.39% and 81.04% after the adjustments of air supply and thermal input. The investigation provides solid references for incinerating new MSW in the current boiler.

CFD simulation

Air supply

MSW incineration

Grate boiler

Bed model

Waste classification

Författare

Tianbao Gu

Aalborg Universitet

Wenchao Ma

Tianjin University

Torsten Berning

Aalborg Universitet

Zhenning Guo

Everbright Envirotech (China) Ltd.

Ronnie Andersson

Centre for Chemical Process Engineering

Chalmers, Kemi och kemiteknik, Kemiteknik

Chungen Yin

Aalborg Universitet

Energy

0360-5442 (ISSN) 18736785 (eISSN)

Vol. 254 124338

Ämneskategorier

Energiteknik

Strömningsmekanik och akustik

Annan elektroteknik och elektronik

DOI

10.1016/j.energy.2022.124338

Mer information

Senast uppdaterat

2022-07-01