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利用CHEMKIN软件的PSR模块对次烟煤常规燃烧和富氧燃烧的试验过程进行了模拟,通过对两种燃烧方式下NOx生成速率的比较,从机理上分析了富氧燃烧方式下影响NOx生成的因素.结果表明:在富氧燃烧的情况下,O2和煤粉热解产生的NH3、HCN是NOx生成的主要因素,在保证正常燃烧情况下,应尽量降低O2量;烃类物质和CO2分解的CO对NOx的分解起到重要作用;选择适当的循环倍率对控制NOx的生成也起到一定作用,综合锅炉运行情况,建议循环倍率选择0.7.
CHEMRIN software PSR module was used to simulate the routine combustion and oxy-fuel combustion of sub-bituminous coal. By comparing the NOx formation rate under two combustion modes, the factors influencing NOx generation under oxygen-rich combustion mode were analyzed mechanistically The results show that in oxy-combustion, NH3 and HCN generated by pyrolysis of O2 and pulverized coal are the main factors of NOx formation, and the amount of O2 should be minimized under normal combustion conditions; CO plays an important role in the decomposition of NOx. Choosing an appropriate cycle rate also plays a role in controlling the NOx formation. Combining with the operation of the boiler, it is suggested that the cycle rate should be 0.7.