TITLE : CYCLONIC TYRE INCINERATOR SIMULATION
By : Simon Hibbert of CHAM Consultancy
For : LUCAS Furnaces Ltd
PHOENICS Version : 3.1
Date : 02.1998
- The flow in the tyre-burning furnace was simulated in order to predict
velocity, pressure and temperature for steady-state operating conditions.
- Of particular interest was the mixing pattern, known to
influence the combustion efficiency and gas composition at
outlet greatly .
- Tyres are fed to the hearth at the furnace periphery and
incinerated, after which the solid residue is disposed of via a quench
tank at the centre of the furnace.
- The key feature of the gas flow is that it swirls due to the injection of
air by angled jets, which are located around the refractory wall, at a
level just below the sloping furnace roof.
- Cool air is drawn downward from the jets at the periphery of the furnace,
and travels across the hearth, where it oxidises the tyres. Combustion products
then travel upward as a swirling plume ensuring effective mixing and combustion.
Pictures generated in S-Photon are of:
- The flow predictions matched well both quantitatively with pressure and temperature,
and qualitatively with the experience of furnace operators.
- The study also provided insight into the mechanics of fluid mixing which was not
- Layout (half section),
- Iso-surface of pressure indicating the shape of the cyclone above the quench tank,
- Streamlines illustrating the path of the combustion products from the furnace hearth to the outlet at the top of the furnace,
- Iso-surface of temperature giving the shape of the thermal products stream,
- Iso-surface of turbulent viscosity highlighting a region of turbulence in the vicinity of the furnace roof.