Reduce Peak Energy Usage With These Strategies

Learn about procedures and equipment that can help you cut your power bill and make your equipment last longer.

Aw 104093 Factory Worker Pumps

您可以从高处获得指令:减少峰值能源需求。也许是由新法规触发的,也许是为了减少碳足迹,或者目标是削减支出。这是一个简单的订单,但很难执行。您已经担心质量,生产力和表现。您正在努力最大程度地减少停机时间并最大化吞吐量。您很想进步到预测性维护,但现在您只是忙于保持线路的运行。现在他们希望您少做这一切吗?您应该如何实现这一目标?

减少能源需求比您想象的要容易得多。通过应用一些简单的工具和技术,您可以削减消耗的能量,修改公用事业公司的高峰需求方式,并在使用时使设备更长更好地运行。

能源101

公司的能源账单比仅仅千瓦时的单位价格要复杂得多。由于工业客户是如此大的能源消费者,因此公用事业已经开发了收费结构,使他们对消费负责。推出足够的电流以满足高峰值需求,需要从电缆到变压器的更强大的基础架构。结果,公用事业按使用费用量表消耗。这是帐单周期之前的月或季度记录的峰值能量使用的因素,并且已应用于整个账单。放弃该高峰使用情况,您将丢弃支出。

同样,能源成本按一天的时间缩放。白天营业时间的费用最高,过夜最低。同样,这是重新分配您的用法以获得最经济的交付的问题。

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除非您知道存在问题,否则您无法解决问题。这就是为什么过程需要从详细的能源审核开始的原因。诸如AX Energy之类的能源监测工具可在设施级别上逐个组件级别上的使用情况完全可见。确定全天发生的需求尖峰。寻找负责最大消费的机器和组件。这些将充当您的机会目标。接下来,考虑能源储蓄工具箱中的工具。

Your first tool is timing. Cutting peak energy demand can be as simple as scheduling. Do you have two energy-intensive processes overlapping? Is there a way to decouple them? If not, can you schedule them during an overnight shift or do payroll costs outweigh the potential savings?

在许多设施中,每日启动仪式涉及切换单个开关,并等待设备在地板上打开和初始化。当前数十个或可能同时启动的数百个电动机的合并平局产生了巨大的需求尖峰,该尖峰将通过屋顶发送使用费用。解决方案是随着时间的推移将其传播。通过使用电子计时器或建立过程:单元格在时间t = 0开始,五分钟后,三个单元格在五分钟后开始。电力公司将它们注册为三个独特的较低绘制事件。就这样,高峰需求下降。

切割消耗

上述技术会影响Power Company记录消费的方式以计算您的账单。他们不会改变实际的消费本身。为此,我们转向可变频率驱动器(VFD)。

这top energy hogs in industry are pumps, fans, and compressors. They are powered by AC induction motors, which typically operate at fixed speed. That’s fine for some applications but for many others represents wasted energy. Maybe a compressor runs constantly when it is only needed 40% of the time. Maybe a pump needs to operate at different speeds. For decades, the primary method to get variable speed operation from an AC induction motor was to run it at top speed and adjust using mechanical devices such as clutches, brakes, damper vanes, valves, etc. The high speed and high duty cycle led to premature failure in both motors and bearings. The mechanical elements added to maintenance and introduced points of failure. Most of all, it wasted energy. VFDs provide an alternative.

A VFD uses pulse-width modulation to convert the frequency of AC wall plug power to between 0.3 Hz and 120 Hz. The speed of an AC induction motor goes as the frequency of the input, so we can use a VFD to make the motor run at a range of speeds. It’s a digital device, so it can be programmed to drive the motor¾and fan, pump, blower, etc.¾at a set speed or proportional speed based on process steps, schedule, operating conditions, or any of a variety of environmental or process triggers. A typical AC motor can be easily driven between 1% and 200% speed continuously, although the operating speed of pumps or fans typically ranges from 50% and 100% speed.

现在,随着旋转速度的立方体,可变扭力负载的功耗会变成(见图1)。这种关系意味着,通过电动机速度而不是机械设​​备调节体积可以大大削减该消耗。VFD还提供了减少使用费用的另一个机会。可以对驱动器进行编程以逐步将电动机启动。这不仅减轻了当前的尖峰,还可以降低电动机的压力以及任何机械组件(例如变速箱,耦合和轴承)。

Figure 1: Because power consumption for variable-torque loads goes as the cube of motor speed, lowering fan and pump speed using a variable-frequency drive versus a mechanical device offers substantial savings.

借助这些类型的简单工具,工程,维护和设施的工作人员可以遵守法规和公司指令,同时保持自己的工作任务:尽可能有效地生产最大的优质产品。

Further Reading

FR-F800 Family of Variable-Frequency Drives (VFDs)

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Meet the Tools

FR-F800可变频率驱动器(VFD)家族对于泵,风扇和压缩机控制是专门设计的,可提供最佳的能源效率。优化的激发控制会自动调整驱动器电流。即使对于以额定扭矩的4%​​运行的电动机,驱动器与标准V/F控制相比,驱动器的效率提高了35%。相反,VFD对于高启动扭矩也表现良好。监视功能将节省在面板,输出终端或网络上显示。

Several features contribute to ease of installation and use. UL-1 design up to 40 HP enables it to be installed without the need for an enclosure. A standard USB port allows it to be set up with the aid of a USB memory stick. It incorporates both on-board memory to store motor parameters and a real-time clock to simplify diagnostics by time stamping trip messages.

FR-F800家庭还防止失败和停机时间。反翼函数功能会自动控制启动之前已经旋转的负载,从而防止电动机和驱动器损坏。负载检测功能监测扭矩需求,以检测可能表明诸如风扇皮带,轴承磨损,管道堵塞和过滤器等问题。对于后一种问题,它包括一个抗肢体功能,例如,允许泵轴(例如,替代方向)直到清除碎屑(见图2)。

图2:FR-F800的抗障碍功能使泵和风扇能够清除否则会损害功能的污染。该驱动器应用用户定义的一系列轴逆转,以从泵的叶轮板上驱动碎屑。

对于压缩机,VFD在保护组件的同时最大程度地提高效率。大多数压缩机具有最大和最小运行速度。可以对FR-F800 VFD进行编程以执行这些操作条件,并在系统中已经存在压力的情况下防止过度加压。

To find out more about the FR-F800 product line, clickhere

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