A theoretical reaction model of combustion zone in the raceway has been developed on the basis of the reaction engineering by taking account of movement, volatilization and combustion of pulverized coal inthe blow pipe and the tuyere. Furthermore the effects of some PCI(Pulverized Coal Ingection) parameters on the distribution of process variables in the combustion zone are examined.
Volatilization and combustion of pulverized coal in the blowpipe zone considerably affect combustion reactions in the raceway region. The PCI operation not only shifts the distribution patterns of temperature and composition of gas in the raceway toward the tuyere nose, but also decreases the maximum temperature in the raceway. Such effects become particularly remarkable with the increase in injection rate ofpulverized coal. At the operation with constant theoretical flame temperature, however, only the distribution of process variables is varied toward the tuyere nose while the temperature level is maintained. Theincreases of blast temperature and pressure also shift the distribution of process variables toward tuyerenose, and these effects are gradually saturated at Tb>l473 and P>0.26 MPa.