Anti-erossion measures for circulating fluidized bed boilers

      At present, China's thermal power plants still account for more than 50 percent of the power generation, circulating fluidized bed boilers are one of the main equipment for the production of power generation in thermal power plants. However, because of the characteristics of circulating fluidized bed itself, the problem of wear and tear is inevitable. If the boiler wear problem is serious and may even lead to boiler burst, this series of problems will lead to power plant downtime maintenance. This not only affects the smooth production of the power plant, but in serious cases may even produce safety accidents. For thermal power plants, boiler active anti-wear is essential.

　　According to our years of experience, the analysis of boiler wear the main causes of wear for the following points.

　　1, the impact of flue gas flow rate

　　In the daily operation of the boiler, the higher the discharge flue gas flow rate, the more serious the wear and tear on the circulating fluidized bed boiler will be. And flue gas flow rate and air volume also has a certain connection, the greater the air volume, the greater the wear and tear; if the secondary air volume is larger, it will be a violent disturbance of the combustion conditions in the furnace, directly increasing the amount of wear and tear of the heated area, and all of these will cause losses to the boiler.

　　2, flue gas particle concentration impact

　　In the circulating fluidized bed boiler fuel combustion in the furnace chamber, will produce a large amount of flue gas, the greater the concentration of these flue gas particles, it will directly make the circulating fluidized bed boiler heating surface wear.

　　3, the impact of the nature of the fuel

　　Circulating fluidized bed boiler fuel used also has a great impact on the wear and tear of the boiler, fuel particle hardness, ash degree will cause wear and tear on the boiler. The greater the ash content, the greater the wear caused by the boiler.

　　Circulating fluidized bed boiler active anti-erossion measures

　　In the daily use of circulating fluidized bed boilers, active anti-wear measures can not only improve the energy efficiency of the boiler, but also ensure the smooth operation and increase the life of the boiler.

　　After years of research, development and innovation, we have officially launched the grid anti-wear technology. This technology is an active anti-wear technology, in which alloy grating plates are installed on the surface of the water-cooled wall along the horizontal and vertical directions to form a mesh grating, blocking the formation of high-speed wall flow, optimizing the flow field on the surface of the water-cooled wall, eliminating local eddy currents, reducing the velocity of the two-phase flow against the wall, and reducing the cutting force of the material particles on the water-cooled wall, so as to effectively control the wear problem of the water-cooled wall.

　　This anti-wear technology has been successfully applied in many power plants, ensuring the smooth operation of power plant boilers, and also improving the energy efficiency of boilers, greatly reducing the number of power plant boiler shutdowns, and even basically no shutdowns have occurred.