HAMECH DTR KWH
10
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Remove fuel, slag and ash from the boiler.
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Close cut-off valves.
5.5. Water supply
Quality of water supplied to the boiler and heating system has major influence
on reliability and lifetime of the boiler. There are two reasons of boiler’s wear:
•
corrosion
•
furr deposits
Destruction (perforation) of walls as a result of corrosion appears rarely. Much
more often pipes and equipment are polluted – or even clogged – with furr;
valves are blocked. Especially dangerous are deposits at heat exchange
surfaces. Furr deposits form an insulation layer, which decreases heat transfer
to the heating media and may cause overheating of walls and consequently
boiler’s major damage.
Furr deposits decrease also water flow. Most suitable water for boilers &
heating systems is the rainwater.
Do not fill the boiler with water of unknown hardness.
It is permissible to supply water of maximum hardness of 4°n (1,44 mval/l) ;
additionally the water should be of alkaline reaction (i.e. pH higher than 7) and
free of salts and gases. Tap water should be softened before use in the
boiler.
Water losses within properly designed and mounted heating system are
insignificant and require refilling very rarely.
6.0. INSPECTION AND MAINTENANCE MANUAL
Inspection and maintenance of measuring equipment & operation tools should
be done every 330 h of continuous work. During inspection it is recommended
to check leakage on welds, connections etc. and – if any – remove them or
seal connections.
6.1. Cleaning
The furnace & grid should be cleaned daily before firing-up the boiler. Partially
burnt fuel removed during cleaning should be thrown back into the furnace
after firing-up.
Boiler should be cleaned after every 200 h of continuous work with basic fuel.
Combustion tubes and their connections should be cleaned at least
every 10 days, but this period depends on many factors e.g. fired fuel, funnel
draft, fuel humidity and may be shorter or longer than ten days.
Cleaning of combustion tubes is very important for the sake of heat exchange,
which is very intensive in this part of the boiler.
Cleaning of the boiler should be done first after the fuel is completely burnt out,
the glow is extinguished and the boiler is cold.
Operations during cleaning:
•
Open flaps (12) and (13), which close smoke walls of boiler’s exchanger.
