高水分煤质下制粉系统的优化设计

Optimization Design of Coal Pulverizing System With High Moisture Content Coal

针对吉尔吉斯斯坦比什凯克2×150MW热电站的中速磨煤机直吹式制粉系统,在入炉煤水分比设计煤种高53%的情况下,通过重新确定新煤种的一次风量、一次风温,并成功处理空预器一次风漏风率远大于厂家保证值问题。通过仅设计优化锅炉省煤器,不更换一次风机,实现2#炉最高负荷由517t/h上升至668t/h,一次风机(额定电流104A)电流由102A降低至87A,且锅炉具备升负荷的能力,以最低的费用完成了制粉系统的优化设计。

For the medium-speed mills direct blowing pulverizing system of 2 x150 MW Bishkek thermal power stations,Kyrgyzstan, under condition that moisture in the fired coal is 53% higher than the design coal, by re-determining the primary air flow and primary air temperature, and successfully handle the problem that the leakage rate of air preheater is larger than the guaranteed value provided by boiler manufacturer, only by optimizing the boiler economizer, not replacing the primary air fans, realizing that the maximum load of 2# boiler increased from 517 t/h to 668 t/h, the primary air fan（with rated current 104A） current decreased from 102A to 87A, besides, boiler has the capacity to increase load, the optimization design of pulverizing system is completed at the lowest cost.