ZGM中速磨煤机风环改造后性能分析及改造效果评估

Evaluation of Retrofit Effectiveness and Performance Analysis for Nozzle Ring Transformation of ZGM Medium Speed Mill

针对某电厂ZGM中速磨煤机运行中存在的磨损严重和通风阻力、磨煤机单耗偏大的问题,进行了磨煤机风环改造。通过对磨煤机风环进行优化设计,合理分配喷嘴气道数量及流通面积,将喷嘴气道数由36个增加至60个,喷嘴出口圆周方向倾角由50°增大至55°,气道流通面积由0. 648 m^2减小为0. 597 m^2。改造后煤粉细度合格、均匀性好,磨煤机液压加载力平均下降1. 02 MPa,最大通风阻力平均下降2. 08 k Pa,电流平均下降26. 5 A,磨煤机单耗平均下降4. 02 kW·h/t,磨煤机高负荷工况下一次风机电流平均下降29. 43 A,节能效果明显。

In order to solve the problems such as serious wear,large ventilation resistance and unit power consumption of ZGM medium speed mill,it was proposed to upgrade the nozzle ring of mill by distributing the nozzle ring and the flow area more reasonably. The number of the nozzle ring was increased from 36 to60,the circumferential inclination angle of nozzle exit was enlarged from 50° to 55°,and the flow area was decreased from 0. 648 m^2 to 0. 597 m^2. The fineness of pulverized coal and pulverized coal uniformity index were qualified after the renovation of nozzle ring. The hydraulic loading force was decreased by 1. 02 MPa in average,the maximum ventilation resistance was reduced by 2. 08 kPa,the electric current of mill had an average reduction of 26. 5 A,the average unit power consumption was decreased by 4. 02 kW·h/t,and the electric current of primary air fan was reduced by 29. 43 A in high-load conditions. The energy saving effect was evident.