Discharging of Live Coals.
There are a number of reasons why a boiler discharges live coals off the end of the stoker grate. They are usually because the coal bed is too thick and the fuel trim is set too high, with the result that the stoker is running too fast. To remedy this decrease the thickness of the coal bed or set your fuel trim down, to slow the stoker. Remember the thicker the coal bed the slower your stoker must run, conversly the thinner your coal bed the faster your stoker must run.
It could also be caused by the demand for steam being suddenly reduced, with the dampers having to be closed causing live coals to be discharged and the boiler to discharge black smoke from the stack, before you have had time to adjust the boiler settings.
The undergrate dampers could also be closed,causing your fires to be incompletely combusted. To remedy this open your undergrate dampers.
Another reason for discharging live coals could be caused by the boiler tubes being blocked, in this case, the boiler must be stopped and the boiler tubes cleaned.
To find out if your boiler tubes are blocked, a good indicator is when your I. D damper is fully open while the F.D dampers remain closed. Your draft gauges will however indicate a balanced draft.
There are a number of reasons why a boiler discharges live coals off the end of the stoker grate. They are usually because the coal bed is too thick and the fuel trim is set too high, with the result that the stoker is running too fast. To remedy this decrease the thickness of the coal bed or set your fuel trim down, to slow the stoker. Remember the thicker the coal bed the slower your stoker must run, conversly the thinner your coal bed the faster your stoker must run.
It could also be caused by the demand for steam being suddenly reduced, with the dampers having to be closed causing live coals to be discharged and the boiler to discharge black smoke from the stack, before you have had time to adjust the boiler settings.
The undergrate dampers could also be closed,causing your fires to be incompletely combusted. To remedy this open your undergrate dampers.
Another reason for discharging live coals could be caused by the boiler tubes being blocked, in this case, the boiler must be stopped and the boiler tubes cleaned.
To find out if your boiler tubes are blocked, a good indicator is when your I. D damper is fully open while the F.D dampers remain closed. Your draft gauges will however indicate a balanced draft.
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