The main object of automatic boiler combustion control is to regulate automatically, the heat input to a boiler in terms of fuel and air supplied in relation to eat output or steam demand. This should be implemented as efficiently as possible in terms of combustion quality and furnace stability.
Combustion air supplies are to be adjusted with change in boiler loads. Steam pressure is taken as the indication for boiler load as the steam pressure is taken as the indication for boiler load as the steam pressure decreases in increasing load and vice versa.
Hence variations in steam pressure is detected and the supply of the fuel and air adjusted accordingly. (Refer Fig.6) The successful operation of the combustion control system depends upon the capability to vary the fuel supply to the furnace based on the signals from the control system.
To achieve this a system of bagasse storage and retrieval facility with about half an hour holding capacity, should be provided before the bagasse system.