indicates the furnace heat absorption distribution. Higher
heat absorption is realised at burner level with front and rear wall
in pulverized coal firing. This is caused by high flame intensity. The
volatile matter is quickly released and burnt. Therefore, a strong
radiation leads to higher heat absorption. In cases of co-firing
and wood firing, heat absorption becomes stronger at furnace side
walls and weaker at front and rear walls. The overall heat absorption
distribution is more uniform. The large amount of volatiles
and its slow release requires 4- to 5-fold longer times for complete
volatile release than that of pulverised coal [10]. The flame volume
is larger and its intensity more uniform.