反吹风式滤袋
由针刺毡与玻纤制成
反吹风式滤袋在其封闭的顶端处从除尘室悬挂下来，并在其开放的底端处被紧固到顶板上。在过滤期间，含尘烟气从下面进入滤袋。烟气在向上流动的同时，也会向外侧进行流动，而粉尘则会收集在滤袋内侧。
为了清除粉饼，需要将要清灰的仓室与过滤流程分离（离线操作）。然后，由反冲洗风机产生逆流，从而使滤袋产生一定振幅的膨胀和收缩。为了避免收缩或膨胀幅度过大 ，可在滤袋上按照设定间隔缝上了支撑环。在清灰后，仓室即重新投入到过滤流程（在线操作）。
High-quality RABH Reverse Air Filters from BWF Envirotec
The design of our Reverse Air Filter Bags differs from conventional filter bags as they work in a different way. Filter bags for Reverse Air Filters must therefore also be mounted differently. A special holder is sewn into the closed upper end of the filter bag to attach the reverse filter. The filter bag is mounted to the baghouse using this bracket. The open lower end of the Reverse Air Filter is connected airtight to the head plate of the baghouse. In filtration mode, the dust-laden gas enters the reverse filter from below. On its way upwards, the gas flows outwards through the fine filter, depositing the dust on the inside of the filter bag. When filtration is running, a filter cake forms on the inside of the filter bag over time. To remove this dust from the surface of the reverse filter and maintain filter efficiency, a backwash is carried out periodically.
Overview of filter bag designs
- sturdy head end with sewn-in holder for attaching the hoses
- bag design for stability: support rings are sewn into the filter bag at defined intervals
- robust materials for demanding environments
- the weight per unit area of the filter material is usually between 350 - 450 g/m²
- large dimensions of the filter bags (diameter up to 300 mm, length up to 12,000 mm)
Depending on the temperature, filter media from the entire product portfolio are used.
RABH Reverse Air Filters - effective cleaning of dust-laden filter media
To clean the filter cake, the chamber of Reverse Air Filters is temporarily disconnected from filtration operation (off-line). Only then does a backwash fan, which is installed outside or directly in the Reverse Air Filter on the clean gas side, create a counterflow that causes the filter bag to partially collapse. To prevent the Reverse Air Filter from collapsing completely, support rings are sewn into the circumference of the Reverse Air Filter at defined intervals. These give the filter bag stability. Backwashing is carried out with clean air from the clean gas side. The counterflow removes the accumulated filter cake from the filter surface. During this cleaning process, the main flow can continue to pass through the filter so that the production process can continue uninterrupted.
In addition to reversing the air flow, many Reverse Filters also use compressed air. Compressed air is blown through special nozzles or valves in short, powerful bursts. These blasts of compressed air can detach dust particles from the filter media. The overlapping of the backwash fan by pulsation improves the efficiency of the cleaning mechanism and thus enables more thorough removal of contamination from the Reverse Air Filter.
When filter bags for Reverse Air Filters are cleaned, the accumulated filter cake breaks up and collapses. The falling dust from above causes a kind of chain reaction that sets off an avalanche of dust (avalanche effect). Particles that adhere to the surface of the filter bag are detached by this dust accumulation and pulled downwards. The reversed air flow combined with the force of gravity causes the particles to be directed into the collection container. The cleaned Reverse Filters return to their original state, ready for a new filtration cycle. The chamber then returns to filtration mode (on-line) and the backwash fan is switched off. The now purified air flow can then be released into the atmosphere. This cleaning process enables almost continuous filtration and maintains the efficiency of the filter system.
Reverse Filter - minimal interruptions with maximum efficiency
- In baghouses with filter bags for Reverse Air Filters, only a small part of the filter elements are usually cleaned at a time, while the others continue to filter the air flow. This sequential cleaning process allows the baghouse to continue operating while optimizing filtration efficiency. Especially in industrial environments where reliable and long-lasting filtration is crucial, our Reverse Air Filters offer an excellent solution.
- The filter bags for Reverse Air Filters from BWF Envirotec impress with their durability. The gentle cleaning mechanism ensures that the filter bags for Reverse Air Filters are only exposed to a low load, resulting in minimal wear. This optimizes resource consumption and improves the overall efficiency of the filtration processes. Regular filter maintenance is an important control measure at BWF Envirotec. These not only enable the timely detection of potential risks and problems, but also significantly minimize downtimes of your baghouse.
- The gentle cleaning method of Reverse Filters is also particularly important when filtering sensitive materials where excessive mechanical impact should be avoided. The materials used in the filter processes are often valuable and reusable products. For this reason, a high filtration efficiency of the Reverse Air Filters is a decisive advantage.
- Reverse Filters impress with their impressive diameter, which leads to a significant increase in their filter area. In view of this characteristic of Reverse Air Filters and the possibility of almost continuous filtration operation, it is practicable to process high exhaust gas volumes on such a filtration system. The consequence is a significant increase in productivity, which in turn leads to lower costs in the long term.
使用必达福环境技术滤袋的8个理由
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