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<p>This study investigates the synergistic effects of co-combusting lignite (L) and chicken manure (CM) in a 350 kWth circulating fluidized bed boiler (CFBB), highlighting an innovative approach to renewable energy and waste management. Utilizing a range of fuel blends from 100% lignite to 100% CM, the research assesses combustion efficiency, emission characteristics, and ash agglomeration tendencies. Techniques such as combustion experiments, videoscopic inspections, and SEM-EDS analysis are employed to explore the combustion process and ash behavior. Incorporating CM increases CO emissions but significantly reduces SO<sub>2</sub> emissions, demonstrating its potential in meeting strict emission controls. SEM-EDS analyses revealed that the ashes were primarily composed of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>, while blends containing higher CM ratios exhibited elevated Na<sub>2</sub>O and K<sub>2</sub>O concentrations, promoting alkali silicate formation and agglomeration. The 25% L + 75% CM blend showed the highest sulfur retention with 4.19% SO<sub>3</sub> detected in bottom ash, indicating enhanced sulfur capture due to calcium and magnesium rich CM ash. Severe agglomeration was observed during 100% CM combustion, particularly around air nozzles, where SEM-EDS analysis of an agglomerated particle identified high concentrations of K<sub>2</sub>O (8.15%), Na<sub>2</sub>O (2.70%), and SO<sub>2</sub> (14.33%). Strategies such as adjusting the bed temperature and optimizing nozzle design were effective in mitigating these issues. The study underscores the importance of optimizing fuel blends for environmental and operational efficiency, suggesting further research on fuel processing and boiler design improvements.</p>

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Synergistic effects of co-combusting lignite and chicken manure in a circulating fluidized bed boiler: an analysis of ash agglomeration and sulfur retention

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Murat Varol,
  • Humberto Garcia Castellanos,
  • Sema Yurdakul,
  • Karani Kurtuluş,
  • Ali Keçebaş,
  • Habib Gürbüz,
  • Yashar Aryanfar,
  • Barış Gürel

摘要

This study investigates the synergistic effects of co-combusting lignite (L) and chicken manure (CM) in a 350 kWth circulating fluidized bed boiler (CFBB), highlighting an innovative approach to renewable energy and waste management. Utilizing a range of fuel blends from 100% lignite to 100% CM, the research assesses combustion efficiency, emission characteristics, and ash agglomeration tendencies. Techniques such as combustion experiments, videoscopic inspections, and SEM-EDS analysis are employed to explore the combustion process and ash behavior. Incorporating CM increases CO emissions but significantly reduces SO2 emissions, demonstrating its potential in meeting strict emission controls. SEM-EDS analyses revealed that the ashes were primarily composed of SiO2 and Al2O3, while blends containing higher CM ratios exhibited elevated Na2O and K2O concentrations, promoting alkali silicate formation and agglomeration. The 25% L + 75% CM blend showed the highest sulfur retention with 4.19% SO3 detected in bottom ash, indicating enhanced sulfur capture due to calcium and magnesium rich CM ash. Severe agglomeration was observed during 100% CM combustion, particularly around air nozzles, where SEM-EDS analysis of an agglomerated particle identified high concentrations of K2O (8.15%), Na2O (2.70%), and SO2 (14.33%). Strategies such as adjusting the bed temperature and optimizing nozzle design were effective in mitigating these issues. The study underscores the importance of optimizing fuel blends for environmental and operational efficiency, suggesting further research on fuel processing and boiler design improvements.