
654 Oxygen-Enhanced Combustion
Some automaticsequences are programmed to execute
well-dened operating actuations. The supervision is
carried out by Supervisory Control and Data Acquisition
Application.
The thermocouples distributed along the gases circuit
are type K and in the water circuit are type T. Both types
have signal converters. The PLC receives the tempera-
tures as 4–20 mA signals with good accuracy. The same
is applied to the piezoresistive pressure sensors. These
sensors have to be carefully protected since they only
endure temperatures up to 150°C, particularly the ones
connected to the boiler itself. Between the connecting
measureme ...