Brief analysis of circulating fluidized bed boiler water cooling wall corrosion and wear causes and solutions

       Nowadays, thermal power plants choose to use circulating fluidized bed boilers, which are more environmentally friendly and energy efficient, and more in line with the requirements of today's industrial environment. However, circulating fluidized bed boilers are also prone to wear and tear because of the characteristics of the furnace itself.

　　Circulating fluidized bed boiler wear has been a common serious problem in thermal power plants, serious wear and tear may lead to boiler tube burst. Once the serious wear and tear or burst tube happens, the power plant will stop production. It directly affects the benefits of the power plant, and serious and even production safety accidents can occur.

　　Circulating fluidized bed boiler most common wear is divided into the furnace wall tube thinning, according to authoritative data statistics general boiler thinning amount of about 1mm per year, serious even up to 5 ~ 6mm years, forming a serious safety operating hazards. Another is the water-cooled wall tube wear, wear problems increase the usual power plant maintenance workload, and seriously even affect the benefits of the power plant.

　　The main reason for wear and tear is the solid material flowing down along the inner wall of the furnace in the junction area to produce a change in the direction of flow, thus producing a scouring of the water-cooled wall tube, producing wear and tear on the water-cooled wall tube.

　　Another reason is that in the transition area due to the solid material flowing down along the wall and the furnace upward movement of solid material movement in the opposite direction, the local production of vortex flow, the water-cooled wall tube wear.

　　After years of experience, we have introduced the CFB boiler grill anti-wear technology. This technology effectively blocks the formation of high-speed wall flow, optimizes the flow field on the surface of the water-cooled wall, eliminates local vortex flow, reduces the velocity of the two-phase flow against the wall, reduces the cutting force of the material particles on the water-cooled wall, and thus effectively controls the water-cooled wall wear problem.