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Schmid - Model UTSR -Moving Grate Firing System
The UTSR boiler unit is equipped with a flat feed grate and also suitable for fuel with a high ash content. The fuel is passed into the furnace from the rear of the furnace on the flat feed grate with high-alloy casting grate bars. The grate bars are designed that they overlap on both sides and the minimum fuel slips through the grate. Furthermore, the grate is designed to enable a clear, uniform distribution of the primary air supplied to the various zones, thereby creating a steady, undisturbed gasification zone. The grate carriage has a hydraulic drive, so that the movement intervals can be automatically adjusted to the capacity.
The complete combustion chamber is lined with fireproof material, thereby producing a high furnace temperature even in case of wet fuel. An additional, full-combustion roof with furnace lining is provided above the radiation cover in the combustion room, which varies according to the fuel. The secondary air supplied to the combustion chamber and the full-combustion stage makes possible a stepped combustion that results in optimum combustion and a reduction in the NOX value in the exhaust gases. This results in low emission values. The ash is transported slowly to the end of the grate and then to the automatic ash removal system. If so desired, an ash removal system can also be installed under the grate. With this system, any fuel that falls through the grate is transported with the grate ash directly to an ash bucket or container, by an ash screw conveyor.
- Operating medium: water / hot water / steam
- Grate cooling: Air / Water
- Operating range: 150 - 6500 kW
- Capacity regulation: modulating
- Water content: M 10-60
- Fuel types: woodchips / bark / residual wood / pellets / alternative fuels
- Wood chips furnaces for private and public installations.
- Bark furnaces and residual wood furnaces in sawmills.
- Residual wood furnaces in the wood-processing industry.
- Fuel supply with hydraulic feeder, single or double stoker
- Primary combustion chamber
- Air-cooled horizontal moving grate
- Under-grate de-ashing – automatic or manual
- Automatic grate ash discharge
- Access to the secondary combustion chamber
- Radiation vault
- Refractory concrete for heat storage
- Secondary combustion chamber – in accordance with low NOx process by means of air control
- 13-pass steam boiler
- Boiler door with automatic pulse-jet cleaning system of the boiler tubes
- Flue gas cleaning by means of multi-cyclone with automatic fly ash discharge
- Flue gas fan – can be positioned either on the right, left or at the rear
- Grate door with safety lock
- Access door to undergrate