概述
A membrane dryer is a bundle of hollow fibres that let water vapour pass through the wall while the dry air continues down the pipe. There are no moving parts, no electricity and no noise.
That makes it the right answer for a laboratory bench, an analyser cabinet, a control panel or a remote instrument, anywhere a small, steady flow of dry air is needed and there is no easy power supply.
主要优势
No electricity
Works from the compressed air itself. Ideal for hazardous areas and remote panels.
Completely silent
No compressor, no valves switching every few minutes. Suitable for laboratories and control rooms.
Nothing to maintain
No moving parts. Change the pre-filter and leave it alone.
Adjustable dew point
Dew point suppression from 20 °C to 40 °C by setting the purge flow.
机器是怎么造的
一束中空纤维，每根纤维的管壁让水蒸气通过的能力远高于空气。干燥的空气从一端出去，水分则被一小股吹扫气带走。
没有任何运动部件，也不用电。这就是它全部的吸引力所在，也是为什么它被用在偏远装置、危险区域，以及离机房很远的用气点。
前置过滤不是可选项。油一旦到达膜组件就会把它永久堵死，所以干燥机前面的聚结级和活性炭级属于干燥机本身，而不是配件。
- 中空纤维膜组件
- 没有运动部件，也不用电
- 露点可达 −40 °C
- 运行无声
- 适合危险区域与偏远场所
- 前置过滤已包含在设计中
- 体积小到可就近装在用气点
- 在受到保护的前提下使用寿命很长
它适合什么，不适合什么
对于小流量、用气点就近干燥，以及任何"有电源或有运动部件就是麻烦"的场合，膜式干燥机是正确答案。
对于大型系统它是错误答案。它消耗的吹扫气是流量中的一个固定比例，在大系统上，这个比例就成了一种昂贵的干燥方式。
我们按您实际的流量选型，而不是按接口尺寸。膜式干燥机选大了会整天浪费吹扫气，选小了则根本达不到露点。
- 最适合小流量与用气点就近干燥
- 在大型装置上不经济
- 吹扫气是流量中的固定比例
- 按实际流量选型，不按管径
- 特别适合没有电源的场合
- 特别适合危险区域
- 按工艺需要选定露点
- 其他方案也会如实比较
配件与服务
需要保养的是前置过滤器。膜组件本身不做保养，它靠被保护；保护得好不好，决定它是用三年还是用十年。
接触过油的膜组件不会恢复。这是关于这种设计最重要的一件事，也是我们把过滤规格与它一起定下来的原因。
我们每次到场都会实测达到的露点，因为膜是逐渐衰减而不是突然失效的，只有测量才能看出来。
- 按周期更换的聚结与活性炭前置滤芯
- 膜组件靠保护，而不是靠保养
- 每次到场都实测露点
- 油污染是不可逆的损伤
- 滤芯按计划更换，而不是出问题再换
- 配件本地有库存
- 与压缩机一并保养
- 服务方案下固定价格
常见问题
How does a membrane dryer work?
Compressed air passes through a bundle of hollow fibres whose walls let water vapour escape while the dry air continues down the pipe. There are no moving parts at all.
Does it need electricity?
No, it works from the compressed air itself, which is why it suits hazardous areas, remote instrument cabinets and anywhere there is no convenient supply.
How quiet is it?
Completely silent: no compressor, no valves switching every few minutes. That is what makes it the standard choice for laboratories and control rooms.
What dew point does it achieve?
Dew point suppression of 20 °C to 40 °C, set by how much purge flow you allow. It is adjustable rather than fixed.
What flow rates does it suit?
Small ones, analyser cabinets, laboratory benches, dental and medical equipment, single instruments. For a factory ring main it is the wrong technology.
What maintenance does it need?
Change the pre-filter and leave it alone. There is nothing else to service, which is the main reason people fit them in awkward locations.
Does it lose air?
Yes, a small purge flow is inherent to how it works. On the flows involved that loss is trivial, but it is why the technology does not scale up.
How long does the membrane last?
Years, provided the air reaching it is properly filtered. Oil is what destroys a membrane, so the pre-filter is not optional.
Can it be mounted in any orientation?
Yes, which matters inside a packed control panel. It is compact enough to fit where a refrigerant dryer never would.
Is it more expensive to run than a refrigerant dryer?
Per unit of air, yes, because of the purge. At these small flows the difference is negligible against the cost of running power to a remote cabinet.
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