Biomass reburn for NOx reduction

 

Biomass reburn has the advantage of net CO2 reduction as well as reducing NOx.

 

This is an 8-year old study, but we will pursue the authors for any updates.

 

Ping Lu

o    Nanjing Normal University

Jiang Wu

Shanghai University of Electric Power

wei-ping Pan

o    Western Kentucky University

 

The effects of biomass types (including cotton stalk, wheat straw, rice husk, and rice straw), the stoichiometric ratio in the reburning-zone (SR2), the reaction temperature in the reburning-zone (t2), the particle sizes of biomass reburning fuels (dp), and the reburning fuel fraction (Rff) on NO reduction efficiency during biomass reburning were investigated systematically in an entrained flow reactor. The NO heterogeneous reduction mechanism resulting from the reburning of wheat straw and its char was analyzed. The results indicated that cotton stalk has the best performance of NO reduction, wheat straw is in second place, and rice husk and rice straw are less effective. In the range of t2 = 900–1100 °C NO reduction efficiency increases when the reburning-zone reaction temperature is increased at the same SR2. NO reduction efficiency increases insignificantly with a decrease in the particle size of the biomass with dp < 425 μm. NO reduction efficiency follows a pattern of first increasing and then decreasing with the decreasing of the SR2 or the increasing of the Rff. The higher NO reduction efficiency (more than 50%) can be achieved in the range of SR2 = 0.7–0.8 or Rff = 20–25% during reburning with the four types of biomass. The contribution of NO heterogeneous reduction by wheat straw char to the total NO reduction was in the higher range of 59–68%, whereas the Rff was in the range of 10–26%.

https://www.researchgate.net/publication/231272890_Study_on_NO_Reduction_and_Its_Heterogeneous_Mechanism_through_Biomass_Reburning_in_an_Entrained_Flow_Reactor