SIMULATION OF FLUE-GAS FLOW IN THE UPPER FURNACE OF A RECOVERY BOILER

Flue gas flow through the upper furnace of a kraft recovery boiler has been numerically simulated to examine the sensitivity of the velocity and the temperature distributions to common modelling assumptions. Th e simulated results agree well with field temperature results and show a severely channelled Bow with a large recirculation zone above the b ullnose. The temperatures in the recirculation zone are only moderatel y affected by the assumption of no boiler bank or constant density.