The coal gasification experiment and thermodynamic calculation of the newly
developed moving bcd coal gasifier with a draft tube are done according to
the thermodynamic calculating model built on the basis of chemical reactio
n equilibrium, mass balance and heat balance. The obtained experimental res
ults are quite approaching to the thermodynamically calculated values. The
effects of steam/coal ratio, air/coal ratio, reaction temperature, reaction
pressure, steam temperature, air temperature on the thermodynamic indexes
of the gasifier are examined through thermodynamic simulating calculations.
Under the optimal simulating conditions, gas calorific value, cold gas the
rmodynamic efficiency and available energy efficiency can reach 12 MJ/Nm(3)
, 88.6% and 95.4% respectively, when air is used as the oxidizer. Compared
with the directly-burning-coal-gasifier, the gasifier exhibits good charact
eristics and prospects for industrial application.