Simulation of flue gas flow in the upper furnace of a recovery boiler

Copyright Pulp & Paper Canada. Reprinted with permission from Annex Business Media.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 modeling assumptions. The simulated results agree well with field temperature results and show a severely channeled with a large recirculation zone above the bullnose. The temperature in the recirculation zone are only moderately affected by the assumption of no boiler bank or constant density