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新莆京股份

CHINSC

节能环保 绿色科技 和谐发展 造福人类

19

2017

-

09

变频器在污水处理厂的应用方案

作者:


  一、污水处理工艺过程简介

  城市污水处理工艺按流程和处理程序划分,可分为预处理工艺、一级处理工艺,二级处理工艺、深度处理工艺和污泥处理工艺,以及最终污泥处置。格栅预处理目的是截留大块物质以保护后续水泵管线、设备正常运行。一级处理工艺主要是初次沉淀池,目的是将污水中悬浮物尽可能沉降去除,二级处理工艺主要是由曝气池和二次沉淀池组成。目的是利用微生物新陈代谢将污水中的大部分污染物变成CO2和H2O,该部分作为污水处理厂主要处理工段,组成较复杂,不同工艺,设备选择不尽相同。深度处理工艺主要是污水回用于工业等特殊用途而进行进一步处理工艺,通常处理工艺有混凝沉淀、过滤、加药和加氯等,并设有出水泵站。污泥处理工艺及污泥处置主要包括污水厂污泥部分浓缩、消化、脱水、堆肥或制肥、农用填埋等。其一般工艺流程图如下所示:

  二、变频器在污水处理系统中的应用

  在污水处理设备系统中主要用到风机和水泵比较多,从上述工艺流程图可以看出,曝气机和潜水泵是污水处理的核心设备,最适合用变频器对曝气机的鼓风机(罗茨风机)和潜水泵进行调速。

  (1)变频器在鼓风机(罗茨风机)上的应用

  鼓风机将压缩空气通过管道送入曝气池,让空气中的氧溶解在污水中供给活性污泥中的微生物。鼓风机在工频状态下起动时,电流冲击较大,容易引起电网电压波动,而鼓风机(罗茨)风压一定,风量只能靠工作台数及出气阀来调节,实际生产运行中往往使通过调节出气阀来控制,即增加管道阻力,因而许多能量浪费在阀门上。随着变频调速器的广泛应用,利用变频器的调速范围宽,机械特性硬等特点,在罗茨风机上应用了新莆京SVF-EV系列变频器。由于变频器的软启动大大的减小了电机起动时对电网的冲击,而且在正常运行的时候,将出气阀门开到最大,根据工艺和参数的要求,适当的调节(通过控制系统的电位器)电机的转速来调节管道的风量,从而来调节污水中的氧气含量。而且可以根据溶解氧传感器反馈的信号(4-20mA)很方便地实现闭环自动控制。免去了许多繁琐的人工操作,并且具有明显的节电效果。

  (2)变频器在潜水泵上的应用

  潜水泵起动时的电流冲击及调节压力/流量的方式与鼓风机相似。潜水泵起动时的激流和突然停机时的水锤现象往往容易造成管道松动或破例,严重的可能造成电机的损坏,且电机启动/停止时需开启/关闭阀门来减少水锤的影响,如此操作一方面工作强度大,且难以满足工艺的需要,在潜水泵安装变频器以后,可以根据工艺的需求,使电机软启/软停,从而使急流及水锤现象得到解决。而且在流量不大的情况下,可以降低泵的转速,一方面可以避免水泵长期工作在满负荷状态,造成电机过早的老化,而且变频的软启动大大的减小水泵启动时对机械的冲击,并且具有明显的节电效果。

  三、应用效果

  污水处理厂中的鼓风机和潜水泵在使用了SVF-EV系列变频器以后,不但免去了许多繁琐的人工操作,不安全隐患因素,并使系统始终处于一种节能状态下运行,延长了设备的使用寿命,更好的适应了生产需要。SV-EV变频器丰富控制功能可以很方便地与其他控制系统实现闭环自动控制,而且SVF-EV采用了标准的MODBUS通讯协议,也很容易实现在DCS系统中的集中控制。因此,在污水处理系统中使用变频器具有很好的推广价值。

这里是占位文字

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