论文部分内容阅读
利用CFX-Tascflow平台,对300 MW机组W火焰锅炉在基础运行工况下的炉内速度场和温度场进行了数值模拟,将模拟结果与采用抽气热电偶测量得到的试验值进行了比较,从而验证了模拟结果的准确性.通过对模拟结果的分析发现:锅炉侧墙压力偏低,造成煤粉气流向侧墙流动,引发结焦;炉内火焰中心偏上,造成飞灰含碳量高,减温水量大.根据计算结果提出4个锅炉改造方案并对其进行了模拟计算与分析,最终确定根据工况5进行锅炉的改造,经2个月的实际运行表明:飞灰含碳量下降了2%,减温水量下降了15 t/h.
The CFX-Tascflow platform was used to simulate the velocity field and temperature field in a 300 MW unit W flame boiler under basic operating conditions. The simulation results were compared with the experimental values measured with a suction thermocouple. The results of the simulation show that the pressure of the side wall of the boiler is low, which causes the flow of pulverized coal to the side wall and causes coking. The center of the flame in the furnace is higher, resulting in high carbon content in the fly ash , According to the calculation results, four boiler retrofitting schemes were proposed and simulated and analyzed. Finally, the boiler retrofitting was carried out according to working condition 5. After 2 months of actual operation, it showed that the carbon content of fly ash A decrease of 2% and a decrease of 15 t / h of water for reducing the water temperature.