Numerical simulation of the combustion processes in a W-shaped boiler furnace under different operating conditions

Numerical simulations of gas-solid flows, heat transfer and gas-particle tu rbulent combustion have been conducted for a three-dimensional, W-shaped bo iler furnace. The gas-particle flow, distributions of temperature and conce ntrations of gaseous constituents, distributions of the rates of heat relea se, burnout rates of coal particles, and formations of volatiles have been predicted. The results indicate that a steady high-temperature zone is form ed under the arch of the W-shaped flame boiler, this zone would be of benef it to the ignition and carbon burn-out and suggest that the W-shaped flame boiler is suitable for burning low-quality coals and can operate well under different operating conditions for full and partial loads. Copyright (C) 1 999 John Wiley & Sons, Ltd.