The purpose of connecting compressed air at the inlet of the plate and frame filter press
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What is the purpose of connecting compressed air at the inlet of the plate and frame filter press?
For a simple question, a simple answer: dry with air. To explain further, in such piping systems, at the material inlet and during the later stage of cake formation, low-pressure air is used for drying. Such drying can, on the one hand, increase the yield of the filtrate, or in other words, ensure that the filtrate is completely removed ； The other side obtains a “dry” filter cake with little liquid content.
I agree with what was said on the second floor; pharmaceutical companies make extensive use of plate and frame filter presses.
Does the feed inlet of a plate and frame compressor also have a pressure relief function? I’ve always thought that it has this function as well, in addition to removing washing liquid!
Generally, it is first flushed with water or another liquid, and then dried!
In addition to drying and depressurizing, introducing compressed air can also serve to loosen the filter cake.
None of the above answers are comprehensive; the main purpose is that before disassembling the press, there are many materials inside, and compressed air must be used to push these materials into the next processing stage. Of course, using water to push it down works as well, but it will reduce the concentration of the material.
It must be due to accumulation; it’s the same principle as with water ingress – the gas never comes into contact with the filter cake!
Connecting a compressed air pipe at the feed inlet is a highly unprofessional practice. To dry the filter cake, the common practice is to blow from the back of the filter cake, that is, to introduce compressed air from the filtrate side.
There are two functions. First: it serves for drying, as mentioned on the second floor. Second: it facilitates the removal of the material, eliminating the need for manual cleanup. Pay attention to the installation of the air pipe – it must be connected above the inlet of the material pipe; otherwise, the thin material may flow back into the air pipe or the air tank during the drying process.
Agree with the idea of “drying it off”!
Not only should a pipe be connected above the inlet of the material pipe, but a check valve must also be installed.
The key is to see whether the material concentration can be reduced before it moves on to the next processing step; using water as a pushing medium works in the same way, and it is also cheaper than compressed air.
My company has plate and frame filters, but I haven’t seen any that use air for drying. I’m not sure what’s going on – is it used for drying or for unloading? It doesn’t seem like either!
Compressed air is introduced to blow out the liquid from the cavities formed between the filter plates, thereby reducing the liquid content in the filter cake and achieving better solid-liquid separation； However, introducing compressed air at the inlet is not ideal, as it instead causes the filter cake to bind more tightly to the filter cloth. Compressed air should be introduced through a passage formed at one corner of the water outlet hole on the filter plate, and strict requirements exist regarding both the water outlet holes of the filter plate and its installation.
I’ve learned it, and it’s very meaningful; however, I’m puzzled as to whether air can dry the filter cake
We have been using plate and frame filters for many years; this is the first time we’ve heard of using wind for drying. I wonder how it’s done – could the original poster draw a diagram?
Plate and frame filters can be of two types: 1. Those that are pressurizable, made of rubber and equipped with gas chambers; air can be pumped into these chambers to squeeze out more water from the filter cake. 2. Those that are not pressurizable, made of plastic or rubber. The purpose of this device is to dry the filter cake by using air to blow out the water contained within it. As mentioned by other users, blowing air from inside the filter cloth to facilitate the removal of the filter cake is one of the methods designed by manufacturers