| Recently, a number of power plants in China apply inferior coal deviated from designed coal caused by tight supply of coal in the market which tremendously affect the economy and safety of power plants. Therefore, efficient and stable combustion has become a research focus in the area of combustion technology. Researchers present a variety of solutions for this key technical challenge, which include switching air distribution mode and burners operation mode and the application of new type burner. All of these are limited by condition of operation and the complication of technical reconstruction.The refractory belt technology provide simplest and most effective solution to this technically difficult promblem. Due to its low cost and reconstruction load with a excellent result, it is widely used in coal fired power plant. However, the refractory belt technology has its own limitations. There is no precise method to determine the area and position of refractory belt resulting in slagging for oversize and not visible effect for undersized. Therefore, it usually takes multiple reconstructions to reach the expected goal.In order to better determine the area and position of refractory belt and minimize work load, this paper adopted relatively mature thermaldynamic calcuation method and analyzed the influence of load, contamination factor, the angle of burner, coal type and coal feed to the area of refractory belt. Optimize the area and position of refractory belt at the same time maintain stable combustion by using numerical simulation to judge the combustion condition in boiler. At last, this paper considered the practical situation in a certain power plant and raise a reasonable solution to improve combustion stability.
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