Numerical study of the combustion and application of SNCR for NOx reduction in a lab-scale biomass boiler

Seyed Morteza Mousavi, Hesameddin Fatehi, Xue Song Bai

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a numerical study of flow, reactions and NOx emissions from a biomass boiler is presented. Detailed reaction mechanisms for the decomposition of tar species, combustion of hydrocarbons and formation of NOx are employed by adopting appropriate reaction sets from literature. The proposed mechanism is used to perform CFD simulations of a laboratory-scale biomass boiler, and temperature and species concentrations are compared with the experimental data. NOx formation and emissions are studied in detail and the contribution of different pathways for NOx formation are identified. Furthermore, the CFD model is used to study the application of Selective Non-Catalytic Reduction (SNCR) method in this boiler. The effects of height and flow rate of ammonia injection on the performance of SNCR method are studied. It is observed that the SNCR, can reduce up to 63% of NOx emissions.

Original languageEnglish
Article number120154
JournalFuel
Volume293
DOIs
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Fluid Mechanics
  • Energy Engineering

Free keywords

  • Biomass combustion
  • CFD simulation
  • Detailed tar species
  • NO emissions
  • SNCR
  • Wood pellet boiler

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