Schmid - Model UTSP - Underfeed Stoker Furnace
From Industrial Systems - Firing Systems
The Schmid Pelletronic UTSP pellet boiler works on the same principle as the underfeed stoker furnace. The pellets are feeded from below into a combustion retort made of high-alloy casting. The complete combustion chamber is lined with fireproof material, which leads to a high furnace temperature.
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Details
- Operating medium : Water / Hot Water / Steam
- Grate cooling : Air
- Operating range : 180 - 900 kW
- Capacity regulation : modulating
- Water content : M 10
- Fuel types : Pellets
Details
- Fuel supply with stoker screw
- Combustion tray with cast ribs and primary air supply
- Combustion chamber
- Refractory concrete for heat storage
- Secondary air inlet
- Radiation vault
- 3-pass steam boiler
- Boiler door with automatic pulse-jet cleaning system of the boiler tubes
- Flue gas cleaning by multi-cyclone with automatic ash particle discharge
- Flue gas fan – can be positioned either on the right, left or at the rear
- Grate door with safety lock
- Burnout grate
- Automatic grate ash discharge
- Ash container for grate ash
Combustion Chamber Design
- Insulation of the combustion chamber (100 mm) with external cladding plate
- Air cooling inside double-wall steel plate construction (5-5 or 6-6 mm)
- High temperature resistant heat insulation board (60 mm)
- Fireproof ceramic fibre mat coated with aluminium foil (13/25 mm)
- Fireproof cast concrete (115-150 mm)
The refractory concrete is secured to the steel st...
The refractory concrete is secured to the steel structure of the combustion chamber with heat resistant wall anchors. The refractory concrete has a high density as well as a high temperature resistance and is cast in sections. Dilation seams between the sections compensate for expansion of the refractory concrete when the temperature fluctuates. The ceramic fibre mat behind the refractory concrete and the high temperature resistant heat insulation board protect the steel plate structure against overheating.
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