Abstract
This chapter discusses application of automatic control in fuel combustion. For the efficient operation of all types of furnaces, maintenance of temperature without waste of fuel is necessary. This can only be done with large furnaces by automatic control. Any furnace control system consists of a temperature measuring instrument and fuel/air controls operated by this instrument. The complete system usually comprises three parts: (1) temperature measurement, (2) air/fuel regulation, and (3) master control, linking temperature measurement and air/fuel regulation together and to other units of system. No measuring device can give instantaneous response to the changes that it measures and no control system can give instant control response. Practical systems vary from the simple on–off control, in which all the heat is applied, or none, to the complex proportional response with reset control. Intermediate is proportional response in which a proportion of the heat is cut out when the temperature exceeds the set point. This type of control gives a much smaller temperature variation than on-off control, but the average temperature is somewhat above that desired. Temperature measurement is done by some form of recording instrument.
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