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4 Installation, commissioning
4.3
Heating the combustion chamber
When commissioning the system, the temperature of the combustion chamber must be
raised very carefully. This is done to prevent damage to the refractory lining from mois-
ture build-up. The following heating curve for drying the refractory lining applies to low-
cement refractory concrete:
2)
1)
Fig. 15
Chart key
1) Holding time at temperature per 25mm of concrete wall thickness = 1 hour.
2) Never heat faster, especially at the lower temperatures, as the water contained in
the refractory lining cannot evaporate quickly enough. If heated too quickly, the
refractory lining may be destroyed in an explosion-like event.
3) Continue heating until operating temperature is reached.
4) Once dry, the refractory should be heated at a rate of 50°C/h until it reaches the
maximum temperature.
We recommend letting specialists from Schmid AG energy solutions or from another
specialised service provider heat up the underfeed combustion system for the first
time.
Heating the combustion chamber after an idle period of more than two weeks.
After a prolonged idle period of the combustion system (e.g. during the summer break)
we recommend slowly heating the combustion chamber to minimise the wear on the
refractory material. To this purpose the combustion controller can be used in heat-up
mode.
Underfeed grate UTSK
1.10 en
2)
Heating curve
1)
h
4)
2)
1)
D-43
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