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以某300MW富氧煤粉燃烧锅炉炉膛为对象,根据炉内的流动、燃烧和换热等过程机理,采用集中参数法建立了富氧煤粉燃烧锅炉炉内过程的仿真模型,该模型主要考虑到炉内的燃烧和换热,对不同负荷条件下炉内燃烧和换热进行计算。在炉内辐射换热过程计算中,考虑到气体辐射对波长的选择性,采用了更接近工程实际的气体-灰壁面模型进行计算。进行了不同负荷条件下静态仿真计算及燃煤量与再循环烟气的扰动试验,对炉膛压力、水冷壁辐射换热量和炉膛出口烟温的静态和动态特性进行了研究。发现随着负荷的增加,炉膛出口烟温与水冷壁辐射换热量的过渡时间缩短,对动态响应更加敏感,可为富氧煤粉锅炉炉膛的控制系统设计和机组安全运行提供一定参考。
Based on the process of flow, combustion and heat exchange in a 300MW oxygen-rich pulverized coal fired boiler, a simulation model of the process in the furnace of oxygen-enriched pulverized coal fired boiler was established by the lumped parameter method. The model mainly considered To the furnace combustion and heat exchange, under different load conditions, the calculation of the combustion and heat transfer in the furnace. In the calculation of radiant heat transfer process in the furnace, taking into account the wavelength selectivity of the gas radiation, a gas-ash wall model closer to the actual project is adopted for calculation. The static simulation calculation under different load conditions and the perturbation test of coal combustion and recirculation flue gas were carried out. The static and dynamic characteristics of furnace pressure, radiative heat transfer in water wall and smoke temperature at furnace exit were studied. It is found that with the increase of load, the transition time between the flue gas temperature at the exit of the furnace and the radiative heat transfer at the water wall is shortened, which is more sensitive to the dynamic response and can provide some reference for the design of the control system and the safe operation of the unit in the oxyfuel pulverized coal boiler.