Underfeed stoker furnace UTSK

Application:

• Wood chips furnaces for private and public installations 
• Chips and sawdust furnaces in the wood processing industry

Fuel is passed from below into the high-alloy casting combustion retort of the UTSK underfeed stoker furnace. The complete combustion chamber is lined with fireproof material, thereby producing a high furnace temperature even in case of wet fuel. A radiation roof, which varies according to the material, is placed over the combustion chamber. The primary air is passed into the combustion retort through the cast-iron bars, where a steady gasification of the combustion material commences. The secondary air that is passed into the combustion chamber leads to optimum combustion and therefore low emission. The ash is removed over a full-combustion grate. Under the full-combustion grate, there is a screw conveyor that conveys the ash directly into an ash collection box or container. The furnace is fully flushed with primary and secondary air and combined with the highly effective insulation, there is minimum radiation. A suitably dimensioned 3-pass flue boiler is installed above the furnace. The multiple dry cyclone is installed directly behind the heat exchanger and therefore receives an optimum flow.

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.