Flue gas analysis for biomass and coal co-firing in fluidized bed: process simulation and validation

Daulet Zhakupov, Lyazzat Kulmukanova, Yerbol Sarbassov, Dhawal Shah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Coal-conversion technologies, although used ubiquitously, are often discredited due to high pollutant emissions, thereby emphasizing a dire need to optimize the combustion process. The co-firing of coal/biomass in a fluidized bed reactor has been an efficient way to optimize the pollutants emission. Herein, a new model has been designed in Aspen Plus® to simultaneously include detailed reaction kinetics, volatile compositions, tar combustion, and hydrodynamics of the reactor. Validation of the process model was done with variations in the fuel including high-sulfur Spanish lignite, high-ash Ekibastuz coal, wood pellets, and locally collected municipal solid waste (MSW) and the temperature ranging from 1073 to 1223 K. The composition of the exhaust gases, namely, CO/CO2/NO/SO2 were determined from the model to be within 2% of the experimental observations. Co-combustion of local MSW with Ekibastuz coal had flue gas composition ranging from 1000 to 5000 ppm of CO, 16.2%–17.2% of CO2, 200–550 ppm of NO, and 130–210 ppm of SO2. A sensitivity analysis on co-firing of local biomass and Ekibastuz coal demonstrated the optimal operating temperature for fluidized bed reactor at 1148 K with the recommended biomass-to-coal ratio is 1/4, leading to minimum emissions of CO, NO, and SO2.

Original languageEnglish
Article number59
JournalInternational Journal of Coal Science and Technology
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 2022
Externally publishedYes

Keywords

  • Advanced process simulation
  • Aspen plus
  • Biomass cofiring
  • Flue-gas emissions
  • Fluidized-bed combustion
  • Fuel utilization

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

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