型号 : | IC698CRE040 | 品牌 : | GE/通用电气 |
加工定制 : | 否 | 产品认证 : | 已认证 |
输出频率 : | 2220kHz | 工作电压 : | 220V |
IC698CRE040
IC698CRE040
IC698CRE040
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〖厦门光沃自动化设备有限公司 竭诚为您服务〗
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【价格】如此低价,一家
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【质量】全新原装,进口***
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【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件
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在设计过程中过多考虑建设前,后长期工艺要求的差异,使裕量过大。如火电设计规程SDJ-79规定,燃煤锅炉的鼓风机,引风机的风量裕度分别为5%和5~10%,风压裕度为10%和10%~15%,设计过程中很难计算管网的阻力,并考虑长期运行过程中可能发生的各种问题,通常总把系统的最大风量和风压裕量作为选型的依据,但风机的系列是有限的,往往选不到合适的风机型号就往上靠,大20%~30%的比较常见。生产中实际操作时,对于离心风机﹑泵类负载常用阀门、挡板进行节流调节,则增加了管路系统的阻尼,造成电能的浪费;对于恒转矩负载常用电磁调速器﹑液力耦合器进行调节,这两种调速方式效率较低,而且,转速越低,效率也越低。由于电机的电流的大小随负载的轻重而改变,也即电机消耗的功率也是随负载的大小而改变,因此要想地计算系统的节能是困难的,在一定程度上影响了变频调速节能的实施。本文介绍用以下的公式来进行节能的估算。
二、节能的估算
1﹑风机﹑泵类平方转矩负载的变频调速节能风机﹑泵类通用设备的用电占电动机用电的50%左右,那就意味着占全国用电量的30%。采用电动机变频调速来调节流量,比用挡板﹑阀门之类来调节,可节电20%~50%,如果平均按30%计算,节省的电量为全国总用电量的9%,这将产生巨大的社会效益和经济效益。生产中,对风机﹑水泵常用阀门、挡板进行节流调节,增加了管路的阻尼,电机仍旧以额定速度运行,这时能量消耗较大。如果用变频器对风机﹑泵类设备进行调速控制,不需要再用阀门、挡板进行节流调节,将阀门、挡板开到最大,管路阻尼最小,能耗也大为减少。节能量可用GB12497《三相异步电动机经济运行》强制性国家标准实施监督指南中的计算公式,即:
对风机、泵类,采用挡板调节流量对应电机输入功率PL与流量Q的关系
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