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C1 - wood pellets
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ATTENTION! Poor fuel quality can significantly affect performance and emission parameters of
the boiler.
The pellets must comply with the requirements of the standard ČSN EN 14961-2.
4. Boiler description
4.1. Boiler design
The boiler construction meets the requirements according to:
ČSN EN 303-5: 2013 - Heating boilers - Part 5: Heating boilers for solid fuels, hand and
automatically stocked, nominal heat output of up to 500 kW -
Terminology, requirements, testing and marking.
The main part of the boiler is the steel boiler body, made up of four basic units:
- Combustion chamber
- Combustion chamber stand
- Heat exchanger
- Heat exchanger stand.
All parts of the boiler body at the interface of flue gases and heating water and all the
supporting parts of the stands are made of sheet metal with a thickness of 5 mm. In front of the
3-draft boiler body there is a combustion chamber with a burner; at the back of the boiler body
there is a tubular heat exchanger providing for the decisive transfer of heat from flue gases to
the boiler water.
The burner, located in the stirrer and mounted to the side wall of the stand, operates on bottom
stoking principle. It consists of a refractory elbow (so-called retort) and an iron grate. The fuel
feeder consists of a trough for fuel supply, a channel for supplying combustion air and a
flexible interconnection that serves for pressure equalization under the fireplace and which
prevents smoke penetration into the fuel tank during the combustion process.
The burner is fitted with a funnel-shaped ceramic reflector that directs the exhaust gas flow,
and reduces fly dust. The reflector is fed with secondary air through the side wall of the
combustion chamber which facilitates complete combustion.
Beside the boiler, there is a screw feeder, which provides for transport of fuel from the external
container to the burner. The feeder consists of two screw conveyors (feeding from the bunker +
feeding into the boiler) with a turnstile in between. This serves to create an air gap between the
two screw conveyors, and to avoid any ignition of the fuel in the contaiener. In addition to that,
the cover of the feed from the bunker is fitted with an emergency fire extinguishing system,
which leads to the transported fuel above the turnstile.
Depending on the position of the fuel feed screw towards the boiler drum the boiler is
manufactured in two series versions:
Right version - the fuel feeder is on the right of the boiler body when viewed from the front
Left version - the fuel feeder is on the left of the boiler body when viewed from the front
6


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