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.
o
Nanjing
Normal University
Shanghai
University of Electric Power
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%.