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Setting may be adjusted no more than 5 – 10 % in a single approach. It takes
approximately 20 – 30 min., until the effect of changes will be visible.
If we allow the retort to work with high excess of air in the longer time comparing to
volume of delivered fuel, it will result in the fire “moving down” into the bottom of the
retort, what in consequence may cause cast iron nozzles to be damaged.
Avoid also retort to work with too thick layer of fuel.
When in the automatic mode, the controller measure water temperature in boiler, and
based on its value, controls fuel feeder and blow-in fan, making optimal setting for the
specific fuel type.
As far as weather condition are concerned, combustion intensity, regulation and
heating capacity of the boiler should be accommodated following changing
conditions. This is done by readjusting the temperature of water coming out of boiler
(when tree-way, or four-way valve is installed, the control functions is made by
changing the position of the gate valve). At the same time, the controller operates the
heating system circulation pump (if such is provided).
Heat requirement in the heat installation is varying due to changing outdoor
conditions such as the day time and outdoor temperature. Temperature of water
coming out of boiler depends also on the building thermal characteristic, construction
materials used, especially those used for insulation.
During fire up phase smoke may be getting out of boiler into room or sweating of the
boiler may be observed. After boiler and fluke is warmed up, these effects should be
out. Boiler’s operation stoppage may be due to getting rid of fuel in the hopper, or
feeder blockage due to hard object, stones, etc. presence.
6.2.2.
FIRING UP AND FUNCTIONING OF A BOILER IN THE
“TRADITIONAL” MODE
Before firing up takes place, ash box door should be fully opened, but fuel loading
door and washout hole door should be fully closed. In order to prevent gases against
moving it back into the fuel bunker, while the traditional mode is on (fuel combustion
on the water grate), it is recommended to partially fill the fuel bunker with fine
coal, and then in the manual mode several cycles of feeder work should be
practiced.
