Analysis And Improvement Of The Boiler Fueled With Zhundong High Sodium Coal Coking Problems

Coking of coal-fired boilers are important issues that affect the safety andeconomic operation of the boiler. Coke can cause superheated steam temperaturerise and cause superheated steam temperature, reheat steam temperature by warmwater to open a large, soft drinks and even lead to pipe bursting. The main reasoncoke produced are: the uneven distribution of the furnace temperature, furnacevelocity distribution is uneven, too high a reducing atmosphere in the furnace andthe coal-ash melting point is too low quality. Xinjiang region more high-sodium coaldistribution, due to the occurrence of coal makes this lower sodium coal ash meltingpoint, resulting in China’s Xinjiang power boiler coking widespread, serious impacton the safe operation of the area of the boiler.This paper aiming at330MW Tangentially Fired Boiler Burner layeredarrangement upper primary combustion zone serious coke problem using FLUENTsimulation experiment with a combination of methods, for BMCR runtimeconditions, with the wind in two different ways furnace under combustioncharacteristics, temperature distribution characteristics, dynamic characteristics andcomponents distribution characteristics were analyzed. Studies have shown that:before optimization and stable operation of the furnace flame fullness hightemperature distribution and velocity distribution was "Butterfly" and the higher theconcentration of CO upper primary combustion zone, a strong reducing atmosphere.By changing the upper burner a secondary air for the combustion air distributionmethods to optimize the adjustment. Optimal adjustment of the upper combustionburner region significantly reduced the concentration of CO, and the top speed of theburner zone distribution and temperature distribution relative contraction, inhibitionof coke produced significant effect. Calculated values are in good agreement withthe experimental values, verify the accuracy of the numerical calculation. Combined combustion optimization and numerical analysis to adjust the test results, to enhancethe rigidity of the primary air, using an air side of the installation side of thesecondary air velocity field concentration, temperature distribution are related to,distribution trends oxygen concentration field is consistent with the transformationof the former, the upper front area of the main combustion CO concentration fieldthan the transformation of a relatively large decrease.Numerical and analytical results for the transformation of the expected effectevaluation burner provides some theoretical support for the same type of boilerburner unit uses a similar transformation to optimize a certain reference value.