煤/生物质流态化富氧燃烧的CO₂富集特性

Oxy-fuel combustion with fluidized bed is one of the most promising carbon capture technologies. The oxy-fuel combustion of coal/biomass was simulated in a micro-fluidized bed reactor (inner diameter is10 mm, combustion temperature is 700-900℃) coupled with an online mass spectrometry, to deeply understand the oxy-fuel combustion behavior. Bituminous coal and rosewood were selected as the samples. The effects of oxygen concentration, combustion temperature and mass ratio of coalto biomass on the combustion characteristics, i.e. the total reaction time, the initial reaction time, CO₂ concentration in flue gas and the generation rate of CO₂ during particle combustion, were investigated. It was found that the increment of oxygen volume fraction lead to an increase of CO₂yield, the decrease of total reaction time and CO₂ concentration in the flue gas. Increasing thecombustion temperature could enhance the enrichment of CO₂, as a result higher CO₂ production by particle combustion and CO₂ concentration in the flue gas were obtained. Higher ratio of biomass advanced the initial reaction time and shortened the total reaction time, which resulted in a decrease of CO₂ concentration in the flue gas and CO₂production by particle combustionbut the rate of CO₂ formation is increased.