R&R Consult and VODA A/S collaborated to redesign the secondary air supply and introduce water-cooled boiler walls for a waste heat incinerator at RenoSyd I/S. R&R Consult conducted CFD simulations to map the combustion process before and after the rebuild. The simulations included modeling of the fuel and primary air supply, secondary air distribution, heat transfer, and thermal radiation. The results were used to design an improved secondary air supply system and optimize the fuel/air distribution throughout the boiler domain. The model also helped verify that the boiler would meet environmental requirements for complete combustion.

1. REDESIGN AND OPTIMIZATION OF WASTE HEAT INCINERATOR RENO SYD I/S
Gasværksvej 26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult Info@R-R-consult.com

2. Gasværksvej 26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult Info@R-R-consult.com
R&R Consult and VODA A/S
cooperated in the rebuilding of a
waste heat incinerator at RenoSyd
I/S. The task concerned, among
other things, a redesign of the
secondary air supply and the
introduction of water-cooled boiler
walls. R&R Consult were tasked with
providing CFD simulations, mapping
and visualizing the combustion
process, before and after the
rebuild.
The simulations were conducted as steady-state solutions, featuring a high-
resolution structured mesh. The fuel and primary air supply at the grate were
included via a bed-model, reproducing the combustion steps:
Heating → Evaporation → Devolatilization → Char combustion → Ash
Secondary air distribution and nozzle design provided information of jet
penetration. Heat transfer was included in wall materials, water-cooling and
the heat exchangers. Thermal radiation was calculated based on the local gas
composition. All together, the model was able to replicate the internal
conditions, and provided data and overview that would otherwise be
complicated and expensive to attain through physical measurements.
From the results, it was possible to
design an air supply system, which
better utilized the entire boiler
domain and provided a more
optimized fuel/air distribution. The
results were also used to provide
suggestions for the location of new
temperature sensors. Finally, the
model was used to document that
the boiler operation would fulfill
environmental requirements in
terms of a complete combustion
process.
REDESIGN AND OPTIMIZATION OF WASTE HEAT INCINERATOR RENO SYD I/S