Boiler control
Tips for burner modulation, air/fuel cross-limiting, excess-air regulation, oxygen trim and total
heat control
Boilers are often the principal steam or hot-water generators in industrial plants. Consequently,
they must be designed to operate efficiently and safely while responding rapidly to demand
changes. Burner-management systems must be equally adaptive. Control techniques are
capable of reducing operating costs while providing greater flexibility in plant management and
control. Tools for burner combustion control generally include regulation of excess air, oxygen
trim, burner modulation, air/fuel cross-limiting and total heal control. The better burner control
systems include all of these elements.
Excess-air regulation
In practice, gas-, oil- and coal-burning boilers don't mix fuel and air perfectly, even under the
best conditions. Figure 1 shows that keeping excess air within a specific range ensures
complete combustion and reduces heat loss. Effective regulation of excess air:
Improves heat-transfer rates.
Provides advance warning of flue-gas problems.
Offers substantial fuel savings.
Boiler controlTips for burner modulation, air/fuel cross-limiting, excess-air regulation, oxygen trim and totalheat controlBoilers are often the principal steam or hot-water generators in industrial plants. Consequently,they must be designed to operate efficiently and safely while responding rapidly to demandchanges. Burner-management systems must be equally adaptive. Control techniques arecapable of reducing operating costs while providing greater flexibility in plant management andcontrol. Tools for burner combustion control generally include regulation of excess air, oxygentrim, burner modulation, air/fuel cross-limiting and total heal control. The better burner controlsystems include all of these elements.Excess-air regulationIn practice, gas-, oil- and coal-burning boilers don't mix fuel and air perfectly, even under thebest conditions. Figure 1 shows that keeping excess air within a specific range ensurescomplete combustion and reduces heat loss. Effective regulation of excess air:Improves heat-transfer rates.Provides advance warning of flue-gas problems.Offers substantial fuel savings.
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