Published 2025-01-01
“…Reactor geometry adjustments induced <2% compositional changes, but opposing feed inlets revolutionized mixing dynamics: fuel dispersion uniformity eliminated localized rich zones, intensifying turbulence to boost CO<sub>2</sub> yield by 24% (15.74% vs. 12.66%), enhance CNO→NO conversion (NO↑14%; CNO↓32%), and homogenize temperatures—though a persistent flow dead zone in the upper-right corner induced a 1,217 K hotspot.ConclusionsThis study establishes definitive operational guidelines for sludge-biomass co-incineration FBRs: 1) Maintain primary air >805 Nm³/h to ensure turbulent fluidization while limiting secondary air to ≤30% total flow to balance burnout enhancement against CNO accumulation; 2) Restrict biomass particle size ≤3 cm (equivalent spherical diameter) and prioritize rice husk over wood for high-S/N sludge blends to minimize CNO/H<sub>2</sub>S emissions; 3) Employ dolomite bed material (150-275μm) at 500 mm initial height and 800-850℃ for moderate SO<sub>2</sub>
control while avoiding particle sizes >225μm that degrade fluidization; 4) Implement opposing feed inlets as a
low-cost retrofit to intensify turbulence, elevating NO output by 14% and reducing CNO by 32%—though complementary design modifications (e.g.,
baffle installation, outlet repositioning) are recommended to eliminate identified thermal hotspots. …”
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