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Anchor
八月.201122
文章编辑: 可视编辑
UBB编辑

过滤器和滤材的DNA

Figure 1: Before and after a collapse test当你使用固液分离或者液液分离过滤器来服务于挑剔的工况以确保质量和重复性的时候。是否能够有效地过滤掉可能损坏设备的杂质颗粒或者是否从燃油里去除水分以延长系统服务时间是非常重要的,不恰当的过滤器器设计和滤材的选择将可能导致灾难性的失效。

过滤器有特定的“DNA”这个概念或许听起来比较奇怪,但正如脱氧核糖核酸(“DNA”)定义了人体的特性,过滤器也存在着可以定义其最终性能表现的“DNA”。过滤器被用作分离各种不同种类的颗粒和液体。对于过滤器来说,其效果和效率可在最终为应用于真实工况而进行生产改进前,在实验室内进行测试。例如,绝大部分过滤器和滤材有一个可测得的“临界点”压力值,这个点就是当捕获的杂质被释放到下游的那点。正确的测试可以找到样品的“临界点”。这些逃离出来的杂质可腐蚀或破坏下游的引擎,可能将碎屑带到食品或饮料里,或卡住机械系统零部件。即便在下游杂质增加到破坏临界点之前,由于压力的改变或其他外部环境的原因,还是会导致系统被损坏。每个过滤器都有自己的属性,检查这些属性你需要考虑多种不同的测试来定义一个过滤器的“DNA”。
 
检测一个过滤器的“DNA”远不止简单的初始效率,名义孔径流量或泡点测试技术。当然这些是个良好的开始,“DNA”测试包括更全面的测试,前面提到的几个项目只是过滤器性能的一小部分细节。要想更多地了解一款过滤器,最基本的是要知道它在什么情况下表现最好,在什么情况下表现最差。“DNA”测试使用国际标准作为测试依据以保证试验结果的可重复性并允许与其他过滤器及其应用进行逐个比较。
 
一个过滤器的“DNA”依据其应用过程由多种不同的测试结果组成。
 
可帮助构成过滤器DNA的测试包括:
Anchor
八月.201121
文章编辑: 可视编辑
UBB编辑

The “DNA” of Your Filter and Filter Media

When used in solid-liquid and liquid-liquid separation applications filters serve a critical function to ensure process quality and repeatability. Whether it could remove the particulates that can damage equipment or remove water from fuel to extend system service life is very important. Improper filter design and filter media selection can result in catastrophic failure.
 
The concept that filters have a specific "DNA" may seem odd but just as Deoxyribonucleic Acid ("DNA') defines the nature of the human body, there is a "DNA" associated with a filter that defines how it will perform. Filters are used to separate many different particles and liquids. The effectiveness and efficiency of filters can be determined by laboratory testing before expensive plant modifications are made for real world use. For instance, most filters and filter media have an "unloading point" that is a measureable differential pressure at which filters release trapped contaminants downstream. The correct testing can find these "unloading points". These released downstream particulates can erode or ruin an engine, cause scrap in food and beverage processing, or may even seize mechanical system components. Even before the burst point where the particulates downstream increase, due to change in pressure or other external conditions, can still destroy the system. Each filter has its own attributes and to determine them you need to consider multiple tests to define the "DNA" of a filter.
 
The testing to determine the "DNA" of a filter is much more inclusive than simple initial efficiency, mean pore flow or bubble point testing techniques. While these provide a good starting point, “DNA” testing is more holistic than the above-mentioned tests that provide only one small detail about the filter. The idea of knowing more about a filter is essential in determining where the filter would perform the best and where it will perform the worst. “DNA” tests using international standards provide results that are repeatable and allow “apple to apple” comparison with other filters and their applications.
 
The “DNA” of a filter is formed from the results of various tests depending on the process application.
 
The tests that help form the “DNA” of the filter include:
Anchor
七月.201112
文章编辑: 可视编辑
UBB编辑

How to Optimize the Choice of Filtering Media

SUMMARY

Liquid filter media all have the same role of letting the liquid flow through whilst retaining a part if not all particles in suspension. Liquid filtration occurs in a very broad variety of processes and equipments, from engines fuel or lubricating oil to drinking water through chemicals, blood or varnishes.

Depending on the type of filter used, filtering media are of made of layers of grains (sand or diatomites) or of fibers, which can be wound or processed or papers.

The variety of techniques, processes and liquids they are applied to create a broad spectrum of technical requirements and properties. Tests are developed to evaluate these properties in accelerated conditions, cheaper and much faster than actual operation ones.

The lecture will present an overview of the characteristics of filter media (from granular ones to sterilizing membranes) classified in four families: intrinsical relating to the internal structure of the porous media, hydraulic which cover the impact of the media on the fluid flow, performances, i.e. how the media retains particles or undesirable substances and the impact of their retention on both the permeability and the efficiency and compatibilities, including all “negative” interactions between the media material and the filtered fluid.

Main test procedures (especially standard ones) will be summarised. A brief presentation will be made of their principles, of the equipments and products used, of the criteria of validation of test benches.

The way raw data have to be processed to obtain standard test report will be explained and typical interpretation of data oriented toward the optimisation of the choice of filtering media will be given.

By: Christophe PEUCHOT, Managing Director

Translate by: Zhigang WU, Asian Market Manager

Read the Chinese version of this article

Anchor
七月.201112
文章编辑: 可视编辑
UBB编辑

如何优化液体过滤应用的滤材选择

介绍

  过滤在工业品中以及使用液体作为机器能量来源或辅助工具是最广泛的应用之一。
 
  除了诸如离心,沉降,浮选旋流等固液分离技术外,过滤是最通用的一种。不论设备和操作原理多么不尽相同,也不论分离的范围如何:如从固液混合物中分离固体,或是给液体设定一个净化度或制定的固体悬浮物浓度等,绝大部分的问题都可以通过过滤器来解决。
 
  过滤器的滤材担负着关键角色。为了要满足分离过程和技术的需求,各种各样的滤材被开发出来。如何选择滤材是一个困难的任务:首先,过滤的需求有时并未被过滤器的用户所清晰地定义出来,这就意味着滤材用户有时根本就不知道客户的需求;其次,由于技术和资金的原因,已有的不同滤材在各种不同的特定环境的下的能力也很难被测定。
 
  一些试验因此会在实验室环境下开展,以尽可能真实地模拟真实工况,并量化滤材的属性及其将要实现的功能的关系。
 
  各个专业组织创建自己的测试方法和标准是一种对滤材性能的简化和澄清的方法。具体请点击本文标题,阅读全文;

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