Application of optical diagnosis technology in biomass combustion

Biomass is the only carbon-neutral fuel, the development and utilization of biomass are crucial for achieving carbon neutrality. However, the combustion of biomass in boilers is often unstable due to the heterogeneity of biomass raw materials, leading to a decrease in combustion efficiency and an increase in pollutant emissions. Continuous online monitoring is essential for the safe, stable and efficient operation of boilers. Traditional measurement methods typically rely off-line analysis to study the kinetics of biomass oxidation and pyrolysis. These methods struggle to accurately capture transient parameters during combustion due to changes in reaction pathways and oxidant products. Optical diagnosis is a non-contact, instantaneous and efficient method that can achieve in-situ, online and rapid measurement of multiple parameters. This technology has been extensively applied by researchers in the field of biomass combustion diagnosis. The current status and applications of online measurement methods for biomass ignition/combustion behavior and soot generation are reviewed. The problems and development trends of existing optical diagnostic technologies for biomass combustion are also been proposed. The review suggests that the future development of more diverse and effective optical diagnostic techniques, as well as the combination of various diagnostic technologies, is beneficial for comprehensively analyzing the key issues in biomass combustion, so as to realize the efficient utilization of biomass.