What are the main wear and tear of circulating fluidized bed boilers

       Because of the nature of circulating fluidized bed boilers, wear problems may occur during daily operation. If the wear problem is not solved in time, the wear range may be expanded and serious problems such as tube burst may occur. Serious threat to the normal operation of the power plant, life safety issues and economic efficiency issues.

　　Circulating fluidized bed boiler anti-wear can not be ignored, for the circulating fluidized bed wear problem is currently the most effective way to grill anti-wear.

　　We commonly circulating fluidized bed boiler heating surface wear form mainly in three areas.

　　First, impact wear: impact wear refers to the flow direction of flue gas, solid materials and the heating surface (or tube bundle) is a certain angle wear, the particles are generally tangential or vertical sweep across the heating surface.

　　Second, micro-vibration wear: micro-vibration wear refers to the heat transfer conditions between the heat transfer tube and the support of the vertical movement caused by the heat transfer tube.

　　Third, scouring wear: scouring wear refers to the flow direction of flue gas and solid materials parallel to the heating surface (or tube bundle) when the solid bit, the vortex generated at the platform, etc.

　　For the wear problem of circulating fluidized bed, we have been researching and innovating for many years. And firstly, we introduced the active heat-conducting grill anti-wear technology. This technology is different from the previous passive thickening anti-wear technology, it is in the water-cooled wall surface along the horizontal and vertical direction, installed alloy grating plate to form a mesh grating, reduce the speed of material particles on the surface of the water-cooled wall, block the formation of wall flow, and channel the flow of material on the surface of the water-cooled wall circulation, optimize the surface flow field to eliminate local vortex flow. The construction plan is designed according to the wear characteristics of different boilers, which can play a role in treating both the symptoms and the root cause of wear in circulating fluidized bed boilers. To ensure the boiler under high load long-cycle operation, and increase the boiler's fuel adaptability (such as increasing the proportion of gangue and other blending).

　　Around this technology, we have improved the corresponding grating material attack, grating structure design and optimization, theoretical reference formula of grating laying, calculation coefficient under different working conditions of coal, etc., and finally formed a very mature heat-conducting grating anti-wear technology, around which our company has obtained 14 relevant national patents, including the core technology patent number: ZL 2014 1 0300048.4 , ZL 2014 2 0350767.2 , ZL 2014 1 0300145.3 , ZL 2019 2 1607213.5.

　　Heat-conducting grille anti-wear technology has completely solved the world-wide problem of CFB boiler water-cooled wall prone to wear and leakage, which has long plagued the coal-fired cogeneration industry. The boiler maintenance cycle has been extended by more than 5 times compared with the original anti-wear technology, from less than 4,000 hours of continuous operation to more than 20,000 hours. It saves energy and reduces consumption while greatly improving the safety and economy of CFB boilers.