300MW机组W火焰锅炉改造的数值模拟与分析

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.

Numerical Simulation and Analysis on Retrofit of 300 MW Units with W Flame Boilers

By use of CFX-Tascflow platform,numerical simulation was carried out for the velocity field and temperature field inside the W flame boiler of a 300MW unit under basic operational condition.The simulated results were compared with the experimental values measured by use of the suction thermocouples to validate the accuracy of the simulation.The simulated results indicate that the low pressure nearby the side wall leads to the flow of coal particles toward the side walls,thus resulting in heavy slagging on t...