ALF
阿法拉伐过滤器（ALF）是一款自清洁过滤器，专为保护换热器而设计，可防止其在各类使用冷却系统二次水的行业中发生堵塞、结垢和腐蚀。通过清除杂质和海洋生物，这一工业水过滤解决方案降低了非计划停机的风险，并延长了换热器的维护周期。这一高效的换热器保护解决方案还能提高能源效率、减少二氧化碳排放，并节省运营成本。
提高水过滤效率的特点：
- 久经考验、值得信赖的过滤技术
- 市面上最紧凑的自清洁过滤器之一
- 安装简便，维护成本低
- 过滤能力强，压降低
- 在不中断过滤过程的情况下自动反冲洗
- 阿法拉伐服务提供全生命周期支持
- 适用于所有阿法拉伐板式换热器和管式冷凝器
为什么在二次冷却系统中需要添加ALF？
1. 提高效率
结垢、堵塞和腐蚀会显著降低传热效率，从而限制二次水流经特定换热器的流速。这通常会导致生物污垢的积聚和表面结垢。
阿法拉伐过滤器（ALF）是一种经济高效的解决方案，既能避免上述所有问题，又能确保清洁冷却水的稳定供应。这得益于其自动间歇冲洗功能，该功能在任何情况下都不会中断或干扰过滤过程或冷却作业。
2. 降低成本
由于板式换热器和过滤器的压降均较低，ALF系统的安装有助于降低高效冷却系统的总体成本，同时又不影响其高处理能力。此外，由于活动部件极少，其维护成本也较低。
3. 安装灵活性
ALF 压力过滤器的壳体可选用不锈钢（ALF-S 型）、玻璃纤维增强聚酯（ALF-P 型）或橡胶衬里碳钢（ALF-R 和 ALF-B 型），内部配有不锈钢圆柱形滤篮。这意味着我们提供多种不同的材料规格和网孔尺寸，以满足您的安装需求。
ALF 型设计将进水口与过滤器直接对齐，出水口则呈 90º 角。这种设计使得无需拆卸管路连接即可轻松接触滤篮，因此非常适合安装在任何 90º 弯管处。
运行原理
ALF is designed to maintain the thermal performance of plate heat exchangers and tubular condensers by making sure there is no debris or other undesirable materials in the secondary cooling systems. It works using highly effective automatic flushing set-up that can function automatically at predetermined intervals, or manually by pushing a button on the control panel.
Secondary cooling systems that use inexpensive, low-grade water have become widely accepted in many industries. But, lower-grade water can often contain undesirable particles, organisms, and debris that foul or clog the plate heat exchangers and tubular condensers used in such cooling set-ups.
In a typical secondary cooling system, the ALF filter is always installed downstream from the pump and upstream from the heat exchangers, making sure that there is no debris, or other undesirable materials, in the cooling water. The ALF can either be horizontally or vertically implemented for easier installation.
Process animation
- During normal operation, the flow diverter is open, and the flushing valve is closed. The secondary water is filtered in the basket before entering any heat exchangers.
- In primary flushing, the flushing valve opens the flushing outlet, loosening the debris sticked to the pipe wall and the filter basket. The debris is then flushed out through the flushing outlet.
- In secondary flushing, also known as backflushing, the flow diverters close and the flushing valve remains open. Any dislodged material can then be discharged through the flushing valve.
Step-by-step ALF maintenance guide
This 7-minute video is designed to help you perform self-service cleaning and maintenance on the Alfa Laval ALF filter with confidence.
In line with Alfa Laval recommendations, ALF maintenance should be carried once a year to ensure optimal performance and long service life. Before starting the maintenance, please make sure you have basic service kit or inspection kit available, which is highlighted in the video at 3:37.
Need additional support or to order the service kit?
Selected filtration cases
Data Center Cooling, Italy
To secure high-level performance and efficiency, whilst considering the specific needs of the groundwater cooling system, Alfa Laval provided tailor-made solutions with gasketed plate heat exchangers (GPHE) and 46 x Alfa Laval ALF 10-S for protection of river water cooled GPHEs.
Nuclear power production in UK
8 x Alfa Laval ALF 40-R units are located in the reactor containment building to protect the gasketed plate heat exchangers that cool seawater containing sand (1260 m3/hr/filter).
Gas Production in Middle East
110 x Alfa Laval ALF 60-R for protection of sea water cooled gasketed plate heat exchangers.
Wind Turbines HVDC platform, Offshore North Sea
2 x Alfa Laval ALF 40-R for protection of sea water cooled gasketed plate heat exchangers.
Amino acid production in Southeast Asia
5 x Alfa Laval ALF60-R for protection of sea water cooled gasketed plate heat exchangers.
Steel production in Europe
2 x Alfa Laval ALF 80-R for protection of sea water cooled gasketed plate heat exchangers.
Sugar production in Europe
8 x Alfa Laval ALF30-S for raw sugar juice filtering.
Marine vessel engine cooling
More than 200 x Alfa Laval ALF 20-R / ALF 30-R for protection of sea water cooled gasketed plate heat exchangers.
Power generation in South America
4 x Alfa Laval ALF60-R for protecting condensers.
Energy efficiency
How can Alfa Laval maximize your energy efficiency? Learn about how our solutions make it possible for our customers to reduce their capacity needs by 100 GW a year – reducing CO2 emissions by as much as 25 million tonnes. That’s 550 times Alfa Laval’s own carbon footprint.
