ĐĐ Kotlovi produced and mounted hot water biomass plant with maximum heat capacity of 4 MW at sawmill MMM-Vukelić,
Novska, Croatia.. The plant is intended for the production of thermal energy from wood
residues. It is aimed for supplying technological consumers with thermal
energy. In this case, client already had boiler whose performances were not as declared
one. Instead of 4 MW that boiler could barely reach 1.5 MW, which was insufficient
for the needs of production.
Ensured heat capacity of the boiler and equipment in the range 3-4 MW
Provided heat to the water outlet of the boiler in the range 160-170oC
Ensured safe and reliable performance of sawdust burning
The subject facility should be conceptualized
so that the combustion of wood residues release available thermal energy in the
form of hot water in order to fulfill the set of energy and temperature regimes
of technological consumers exploitation, under optimal technical, and statutory
The available wood residues, used as energy fuel,
are stored in the floor depot of 36m3 working volume, which is sufficient for 16 working
hours of thermal power plants at consumers' nominal load of cca 3200 kW.Fuel is
transported by the floor extractor and the worm gear conveyor to the dosing container,
and from it to the hot water boilers adiabatic swirling furnace by dosing worm
gear conveyor and flow of primary air. After entering the furnace, initiated by
the accumulated heat and the temperature of fireclays walling up to 650/1000oC,
comes to self-ignition of fuel. The end goal of fuel burning process are flue
gases temperature up to 1000/1150oC which produce hot water by passing through
the boilers heating surfaces, and when they get cold being drain into the
atmosphere by the exhaust ventilator through the flue gas over the chimney. Separation
of ash is done within cyclone filter as a part of the flue gas tract, and the
same being collected in the portable ashes containers.
Auto maintenance of overpressure and expansions,
and if necessary, supplementing of hot water system with water is done by
system which consists of a pump, atmospheric vessel and overflow valve. All
devices and segments of the plant are connected in the functional unit of automatic
controlled mechanized fuel supply through equipment of the control cabinet. All
vital functions of plants could be controlled manually. The plant is placed in
the space (LxWxH) 18x12x8 m.
- Water temperature at the outlet of the
boiler is 165oC.
Operation of the boiler plant is fully automatic.
Flue gas temperatures are very low (185-195oC) and boiler
efficiency rate is very high.
Fuel handling, combustion and filtering flue gases are
Economical operation of the boiler (low consumption of
Increased production of veneer for 10 to 15% compared
to the previous state.
Safe and reliable operation of automatic boiler achievement