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6.投资与回报
以佛山市西樵镇某陶瓷厂为例,该厂已安装了37台普雷斯顿公司的大功率变频器。以其中的一台40吨球磨机为例,电动机功率为132 kW,原球磨机每月用电量为:115 kW×18小时×30天=62100 kW.h(度),在安装了球磨机变频节能控制系统后节电率可达14.6%,每月可节省电费为:62100×14.6%×0.65元/度=5893元。若以每台变频器投资为5.5万元计算,投资回收期为55000÷5893=9.3个月。
若以平均节电率12%计算,则月节电效益为62100×12%×0.65=4843元,每台变频器投资为5.5万元计算,投资回收期为55000÷4843=11.3个月,即不到一年就可以收回全部的投资。而变频器的使用寿命一般为10~15年,一年以后即为纯回报期,也即年节电收益在6万元左右。
7.结束语
实践证明,普雷斯顿科技公司生产的大功率变频器用于陶瓷行业球磨机的节能驱动是十分成功的,取得了良好的经济效益。随着用户对变频器的使用经验和接受程度的提高,普雷斯顿大功率变频器在陶瓷行业有着更加广阔的应用前景。
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