monitored as function of time; the gas flow and the temperature
were evaluated by means of on-line measurements. In
the case of the noncatalytic candle, as can be seen in Fig. 4, the
pressure drop increase was almost constant during the whole
gasification time, close to 0.14 cmH2O/min, whereas in the
case of the catalytic candles, without and with foam, the
corresponding value of 0.06 cmH2O/min was observed. During
tests the temperature was about 800 C, the face filtration
velocity was about 90e100 m/h and the syngas flow, shown in
Fig. 5, was in the range 20e30 l/min depending on the gasifi-
cation performance.