Problems that need attention in boiler spraying construction?

       Keywords on this page: boiler spraying, thermal spraying, boiler anti-wear spraying, boiler anti-corrosion spraying, supersonic arc spraying, boiler heating surface anti-wear anti-corrosion, boiler water wall anti-wear spraying, deflector anti-wear, wear-resistant plate installation, Boiler deflector installation, longitude and latitude anti-wear

Boiler spraying: the rationality of the heating surface. This is the core issue of boiler design. Due to the difference between the results obtained by thermal calculation and the actual engineering, it is necessary to strengthen the summary of operating data, increase design experience, fully consider the chemical and physical properties of coal in the design process, and grasp the circulating fluidized bed. The heat transfer characteristics of each heating surface of the boiler improve the accuracy of the calculation results to be close to the real situation;

Bed temperature uniformity problem. Large-scale circulating fluidized bed boilers increase the area of the air distribution plate and the height of the furnace, which is prone to uneven temperature distribution in the furnace. However, necessary measures should be taken to ensure uniform bed temperature and prevent large temperature differences;



Zibo boiler spraying and anti-wear problem. Circulating fluidized bed boiler spraying dense phase zone, separator (especially target zone) and refractory wear layer of return material, dense and dilute phase transition zone, screen, furnace top, furnace outlet, tail flue heating surface, air cap It is necessary to adopt anti-wear technology, especially the anti-wear measures in the furnace should be fully considered at the beginning of manufacture, and should be implemented simultaneously during the infrastructure construction period;





Ash cooling problem. With the increase of boiler capacity level, it is necessary to meet the needs of high-output slag coolers for low calorific value fuel, reducing the number of slag coolers arranged, and ensuring that a large amount of hot ash is cooled and discharged smoothly;



Crushing and screening of raw coal. The supply conditions of the domestic coal market determine that the coal particle size distribution indicators of most circulating fluidized bed boilers are prone to deviate from the design range, especially the distribution of combustion share, fluidization uniformity and bed temperature. Separation, iron removal, wood removal, and anti-clogging process measures are critical to improving the safe and economical operation of circulating fluidized bed boilers;



Auxiliary engine selection problem. Common problems include that the pressure head and air volume of the primary fan exceed the actual demand and the output of the secondary fan is insufficient, the ash and slag system and soot blower cannot meet the operation requirements of burning large ash, low calorific value and inferior fuel, and the limestone desulfurization system in the furnace is insufficient. Road wear and blockage, poor atomization of the oil gun in the ignition starting system, black smoke at startup, etc.;



The selection of technical route for desulfurization and denitrification. Technical measures such as low-temperature combustion, staged combustion, and in-combustion desulfurization of circulating fluidized bed boilers can greatly reduce the original emission concentration of NOx and SO2, which provides convenience for the selection of denitration process and tail desulfurization process. There are also many options for its transformation technology route; it is a scientific and economical approach to systematically evaluate the technology and economy according to the actual situation;