Research On Operation Optimitationof High Temperature Corrosion Protection For Single Furance And Double Tangrential Boiler

The tube explosion caused by the high temperature corrosion of the water wall will cause huge economic losses and affect the normal operation of the power plant.There are many reasons for the high-temperature corrosion of the water-cooled wall of the tangential circle boiler:coal type problems,tangential combustion mode,fineness of pulverized coal and other factors will all lead to the corrosion of the water-cooled wall.The air fullness in the furnace is low,and high-temperature corrosion is more likely to occur.Therefore,the research on the high-temperature corrosion of double-cut round boilers has become a new direction.In recent years,scholars at home and abroad have done a lot of research on the problem of high-temperature corrosion of water-cooled walls.Studies have shown that changing the material of water-wall tubes,changing the arrangement of water-walls,and adding wall-attached wind can effectively control the occurrence of high-temperature corrosion.However,the above research basically needs to change the original material and structure of the boiler,which has a large cost and is not easy to achieve.Compared with these methods,the combustion adjustment method does not require excessive cost,has strong implementability,and is easy to implement.Therefore,this article takes the double-tangent boiler of the Ningxia Fangjiazhuang Power Plant Million Units of China Energy Construction Co.,Ltd.as the research object,in order to prevent the high temperature corrosion of the water-cooled wall during the operation of the boiler,the research is divided into three parts.First,conduct an aerodynamic field test in the furnace to ensure that a normal tangent circle and aerodynamic field are formed in the furnace.Then,using the cold data in the experiment process,the cold field simulation under three working conditions was carried out in the Fluent simulation software,and the velocity field in the furnace was analyzed.The results showed that the tangent circles formed in the furnace under these three working conditions would not stick.The wall is not prone to high temperature corrosion.Finally,considering the combustion adjustment of the boiler,the combustion of the furnace under different burner height-width ratios,different secondary air nozzle swing angles and different primary air rates were simulated respectively.By analyzing the component concentration field,temperature field and velocity field,the discussion The effect of burner aspect ratio,secondary air nozzle vertical swing angle and primary and secondary air momentum ratio on high temperature corrosion of water-cooled wall,the simulation results show that:the boiler should use a combustor combination mode with a relatively small burner height and width during actual operation;When the secondary air nozzle swings upward 15°,the CO concentration at the wall surface of the combustion area is less than 3%,and the oxygen content is sufficient,which can effectively reduce the risk of high-temperature corrosion of the water-cooled wall,but the temperature field in the furnace will move up as a whole.The temperature of reheated steam rises,it is recommended to refer to it for on-site operation;when the primary air rate is 24.1%,the reducing atmosphere near the left and right wall surfaces of the furnace is the weakest and the corrosion is the lightest,and the combustion in the furnace is normal under this working condition.Can be used during on-site operation.The above research results provide new ideas for solving the high-temperature corrosion problem of double-tangential boilers.