Converting Waste Agricultural Biomass into a Resource - UNEP

the long arm of the lever pulls a vertical rod to close the butterfly valve at the
stove’s inlet so that flow of primary air to the gasifier stove will be reduced.
When the airflow to the reaction chamber is reduced, the amount of producer
gas generated for combustion is also reduced, so that the temperature in the
drying chamber drops. When the temperature drops to a set level, the
thermostat will move back to the normal position and the butterfly valve will be
opened. The mechanism of the control system of the thermostat is illustrated
in Figure 2.18. A photograph of the thermostat, fixed inside the drying
chamber, is presented in Figure 2.19.
Using the temperature controller, the inside temperature of air inside the
drying chamber can be maintained in the range of 55-65°C.
115