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By Hjalti Kristinsson

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All stokers are designed to supply a solid fuel to a grate where it is exposed to heat and air and consequently burns. The different stoker designs differ mainly in how the fuel is fed into the burner. 2 Solid Fuel Control Techniques 33 more actuators move fuel from a hopper to the retort, from where it then flows onto the grates on either side. In massfeed stokers, a gate controls the amount of fuel that can flow from the hopper onto the grate. This gate can be either hand or computer controlled.

In solid fuel burners, especially in those using biomass, primary air has additional functions. Since the fuel may contain moisture, the air flow is used to dry the fuel first and the sub-stoichiometric conditions cause gasification of the fuel. 1 covers the ways of handling moisture content in more detail. In systems using grates, mainly stokers, the primary combustion zone can be divided into three areas; drying, gasification and char burning. 2 shows this division of the combustion zone (Ehleskog, Lundborg, Schuster, & Wrangensten, 2002).

This can serve as a feedback measurement to the fuel controller to verify if the correct amount of fuel enters the burner, as well as detecting any irregularities in the fuel bed. The ultrasonic range measurement is done by emitting a sound signal and then measuring the time it takes for the signal to echo back. The speed of the sound signal depends on the transmission medium, in this case the combustion air, and the temperature. In order for the ultrasonic measurements to be usable the temperature in the combustion chamber must therefore be monitored as well.

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