Tarm Biomass Bonus Plus 30, Инструкция по установке и эксплуатации

Страница: 9 / 55

Bonus Plus Instructions Tarm Biomass 1-800-782-9927 Version 11/14 Page 9
The induced draft fan (16) pulls combustion air into the boiler via the primary and secondary air con-
trols and pulls gases from combustion through the heat exchanger and exhausts them out of the boiler.
The
flue gas turbulators (10) provide for turbulent flow of the flue gas in the heat exchanger, increas-
ing heat transfer.
The heat
exchanger tubes (10) transfers the heat from the combustion gasses to the boiler water.
The
firebox (3) is the primary combustion chamber where the wood is loaded and the fire is started.
Secondary combustion air is injected in the nozzle just above the
gasification tunnel (8) that serves to
hold combustion gasses in a high temperature, turbulent environment to achieve high efficiency com-
bustion.
The highly efficient wood combustion in the Bonus Plus boiler is achieved by the draft fan continu-
ously operating once wood in the boiler is ignited to achieve an efficient and clean burn of all the
wood loaded in the firebox. Due to the continuous heat output once the Bonus Plus is ignited the
boiler must be connected to a thermal storage system.
2.2.2 Description of Burn Process
A key component of the Bonus Plus boiler operation is the induced draft combustion fan . Both pri-
mary and secondary combustion air are both drawn into the boiler by the induction blower mounted on
the breach of the boiler. Primary and secondary combustion air are metered through air ducts into the
boiler with the precise volume necessary for proper combustion. The combustion air is drawn through
individually adjustable
primary and secondary air valves . Primary air then is drawn into the firebox
where it is dispersed behind the firebox aprons into the primary combustion chamber just above
the top of the ceramic refractory combustion stones . Secondary air is drawn downward and then
back into the center combustion stone where it enters the combustion throat . Here secondary air is
turbulently mixed at high velocity with hot combustion gasses, which ignite and are burned very com-
pletely before being exposed to the heat exchange surfaces between the combustion chamber and the
breach. The correct proportions of air for combustion from the fan and gases from the wood are a
pre-
requisite for optimal and environmentally friendly burning of the wood with the highest possible effi-
ciency.
A noteworthy construction feature is the special ceramic fuel tunnel (8) in the heart of the boiler
which ensures that the combustion temperature reaches more than 1800 °F (1000 °C). Combustion is
efficient, soot-free, and ensures optimal fuel use. The secondary combustion stones are essential to
achieving complete combustion with log wood. The stones allow the combination of exhaust gasses
and secondary air to reach very high temperatures while isolated from the quenching affect of the wa-
ter jacket.
Carefully engineered
heat exchange tubes downstream from the combustion process are fitted with
removable turbulators to help ensure that a maximum amount of energy is transferred from the fuel
to the hot water jacket. The heat exchange tubes can be accessed for cleaning through the access
panel and door located at the top rear of the boiler Operation of the fan assumes that the boiler
can discharge its heat continually. The Bonus Plus must always be connected to a buffer tank of
adequate size (see page 53)
.
Product Description and Requirements for Safe Operation > Boiler Function