Steam pressure is the key variable that indicates the state of balance between the supply and demand for steam. If supply exceeds demand, the steam pressure will rise conversely, and If demand exceeds supply, the steam pressure will fall. The pressure controller with main header pressure, a controlled variable manipulates the firing rate demand to control the steam pressure at the desired Setpoint. In this case, for multiple boilers and only one common header. Here the term plant master is used because more than one boiler supplies steam to a common header. The plant master generates the master firing rate demand signal that drives the individual boilers in parallel. The primary function of combustion control is to deliver fuel and air mixture to the burner at a rate that satisfies the firing rate demand for efficient combustion. Due to insufficient airflow, the fuel is wasted which makes incomplete combustion and can cause an accumulation of combustible gases. And too much airflo...
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