In a significant advancement for the renewable energy sector, researchers have unveiled a comprehensive model addressing the challenges of ash deposition and fouling in biomass boilers. This study, led by Tongyu Qiu from the College of Energy and Environment at Shenyang Aerospace University, highlights the dual issues of alkali gaseous condensation and fly ash capture that can severely impact the efficiency of biomass-fired power generation.
Biomass, often touted for its zero CO2 emissions, presents a promising alternative to fossil fuels. However, its high alkali metal content can lead to the formation of a viscous initial deposition layer on boiler heating surfaces during combustion. This phenomenon exacerbates slagging, which can hinder boiler performance and increase maintenance costs. “Our research aims to provide insights into the adhesion characteristics of these initial deposition layers, which are crucial for improving the operational efficiency of biomass boilers,” Qiu stated.
Utilizing advanced simulation tools such as FactSage and ANSYS FLUENT, the team developed an integrated model that predicts how KCl condensation and fly ash capture contribute to fouling. Their findings reveal that while the wall temperature has minimal impact on ash impaction efficiency, the velocity of flue gas plays a pivotal role. “Larger fly ash particles are more effectively captured as flue gas velocity increases, while smaller particles tend to adhere to the viscous surfaces,” Qiu explained. This nuanced understanding of particle dynamics is essential for engineers and operators looking to optimize biomass boiler performance.
The implications of this research extend beyond academia. As the construction sector increasingly pivots towards sustainable energy solutions, the findings could inform the design and operation of biomass facilities. Enhanced predictions of ash deposition and fouling could lead to reduced downtime and maintenance costs, ultimately making biomass a more attractive option for energy production. This aligns with global trends towards decarbonization and the urgent need for cleaner energy sources.
The research was published in ‘Meitan xuebao’, which translates to ‘Journal of the Coal Industry’. As the industry grapples with the complexities of transitioning to renewable energy, studies like this one shed light on practical solutions that can be implemented in the field. For more information on the work of Tongyu Qiu and his team, you can visit lead_author_affiliation.
