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变频空压机是不是真的省电呢?
Time:2018-11-12 16:20:19       来源:http://www.jnkbjx.com/      

空压机和风机、泵类同属于恒转矩的流体机械,根据行业经验数据,一台75千瓦的异步变频要比工频空压机节能20%-30%,永磁同步的变频空压机节能30%-40%!(满载除外)。
Air compressors, fans and pumps belong to the same kind of fluid machinery with constant torque. According to industry experience data, a 75 kW asynchronous frequency converter can save 20% - 30% energy than a power frequency air compressor, and a permanent magnet synchronous frequency converter can save 30% - 40% energy. (except for full load).
粗略分析一台75千瓦的空压机连续运转一年消耗电力成本:75千瓦/小时×8760小时/年×0.7元/千瓦=46万元。
A rough analysis is made of the power consumption cost of a 75 kW air compressor running continuously for one year: 75 kW/h *8760 hours/year *0.7 yuan/kW = 460,000 yuan.
20161013211352_5156
20161013211352_5156
如果空压机应用永磁电机变频控制技术一般可节约电力成本46万元×35%=16万元!当然这是一般常见的使用状况,具体以专业的现场分析为准了。
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If the pneumatic compressor applies the frequency conversion control technology of permanent magnet motor, the power cost can be saved by 460,000 yuan * 35% = 160,000 yuan. Of course, this is a common usage situation, specifically based on professional field analysis.
为什么会产生这么巨额的电力成本差异呢?大家知道压缩主机的技术已经同质化的没有啥突破,异步电机也有几百年的历史了,变频器也不是啥新鲜的产品,关键是下面这个原理
Why is there such a huge difference in the cost of electricity? As we all know, there is no breakthrough in the homogenization of compressor technology, asynchronous motor has a history of several hundred years, frequency converter is not a fresh product, the key is the following principle
由流体力学最简单公式可知:P功率=Q(流量)×p(压力)
According to the simplest formula of hydrodynamics, P power =Q (flow) * P (pressure).
流量和转速成1次方正比,压力和转速成2次方正比,轴功率和转速成3次方正比,
The flow rate is proportional to the rotational speed in the first order, the pressure is proportional to the rotational speed in the second order, and the shaft power is proportional to the rotational speed in the third order.
一般压缩机、风机、泵类多是根据满负荷工作需要用量来选型,实际应用上不一定满负荷状态,所以只要转速稍微降一点,负载功率就下降很快,从而达到节能效果。
Generally, compressors, fans and pumps are selected according to the requirement of full-load operation. In practice, they are not always in full-load state. So as long as the speed is slightly reduced, the load power will drop quickly, thus achieving energy-saving effect.
当95%转速时轴功率0.95×0.95×0.95=0.857,类推当90%转速时轴功率0.729、当80%转速时轴功率0.512、当70%转速时轴功率0.343、当50%转速时轴功率0.125、当40%转速时轴功率0.064、当30%转速时0.027.....
The axle power is 0.95 x 0.95 x 0.95 = 0.857 at 95% speed, and the axle power is 0.729 at 90% speed, 0.512 at 80% speed, 0.343 at 70% speed, 0.125 at 50% speed, 0.064 at 40% speed and 0.027 at 30% speed.
也就是说当用气量为30%时,用低转速的电机所需轴功率仅2.7%!
That is to say, when the gas consumption is 30%, the shaft power required by a low speed motor is only 2.7%.
实际上受主机、电机、控制等综合制约变化,现实与以上计算值有所出入。
In fact, it is affected by the comprehensive control of the main engine, motor and control.
DGT45
DGT45
而空压机常规的电机控制分三种:
The conventional motor control of air compressor consists of three kinds.
一种是on/off型,on最高效率满负荷工作、off零耗电停机,这是最理想的节能控制方式!按照国标20千瓦以上异步电机一小时启停不能超过6次,不能频繁启停。但是现在一种可以适合任意频繁启停的超低启动电流的特高效永磁电机已经面世,估计不久就会为社会发挥节能作用
One is on/off, on the highest efficiency full load work, off zero power outage, which is the most ideal energy-saving control mode! According to the national standard 20 kilowatts above asynchronous motor start and stop for an hour can not exceed 6 times, can not frequent start and stop. But now a kind of ultra-efficient permanent magnet motor with ultra-low starting current suitable for any frequent start-up and shutdown has come out, and it is estimated that it will play an energy-saving role for the society in the near future.
另外一种就是卸载空转,就是进气端用阀门关闭实现轻载运行,一般消耗满载60%左右的轴功率,这种控制使用不太经济,适合不能频繁启停的20千瓦以上异步电机控制
The other is unloading idling, which is to realize light-load operation by closing the intake valve. Generally, it consumes about 60% of the shaft power at full load. This kind of control is not economical and suitable for the control of asynchronous motors above 20 kW which can not start and stop frequently.
所以综合来讲变频驱动的空压机就是节约能耗折中的选择了
So in general, the variable frequency driven air compressor is the choice to save energy and trade-off.
关于济南空压机http://www.jnkbjx.com就先介绍到这里了,相信大家在实际的工作中会用到相关知识,如果您有这方面的需要,欢迎前来选购。
About Jinan air compressor http://www.jnkbjx.com is introduced here first, I believe you will use the relevant knowledge in the actual work, if you have this need, welcome to buy.

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