Optimization study on high-temperature corrosion prevention of the water wall of a 1000 MW dual circle tangential boiler during operation

Abstract

High-temperature corrosion of boiler water wall is one of the major factors that affect safe and economic operation of large thermal generator sets. For the high-temperature corrosion of right and left water walls of a domestic 1000 MW dual circle tangential boiler during trial operation, this paper studies impact on high-temperature corrosion of water walls from burner height–width ratio and secondary air nozzle swing angle respectively through Fluent numerical simulation. Simulation results show that a burner combination mode with a small height–width ratio shall be used during actual operation of the boiler. In addition, when the secondary air nozzle is swung upward by 15°, the CO concentration at the place close to the wall surface in the combustion zone is less than 3% with adequate oxygen content, which can reduce high-temperature corrosion risk of water walls.

Keywords

• High-temperature corrosion
• Numerical simulation
• Dual circle tangential boiler
• Burner height–width ratio
• Secondary air nozzle swing angle