Ground tank loading problem
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Our company has a 36-cubic storage tank containing an acidic aqueous solution of AlCl3 at about 90°C, which needs to be pumped to the filter press. Currently, a buffer tank is installed in front of the pump. However, due to the high temperature, the pump always contains acidic gas when it is pumped up. It disappears when the vacuum is applied. Adding water to the buffer tank will affect the product quality, and a submersible pump cannot be used because the tank is equipped with agitators and is prone to collision. Do you have any good suggestions?
Is it not possible to open a hole in the pipe wall near the bottom of the storage tank to take out the material, and then use a pump to transport it to the filter press?
The poster should be working on a buried tank with suction. The pump is placed on the shore to extract materials from underground tanks. Without suitable self-priming pumps and submersible pumps, horizontal pumps can only be used with buffer tanks.
A 36 cubic meter underground tank is not very big. It should be possible to dig a pump pit next to it.
It cannot come out from the bottom. Solids will slowly settle in the material, and then be stirred and thrown to the edge. They will accumulate at the pipe mouth and the pump will be blocked.
We used to install the pump directly from the outlet at the bottom of the tank, but it would get blocked soon, and it was very troublesome to clean, and the smell was very strong. Later, we changed to inserting a tube into the top of the tank to pump out the material.
The outlet is not located at the bottom of the tank. You can raise the outlet position appropriately and add a backwash. According to your statement, if the liquid is only pumped from the top, although the tank has a stirrer, the bottom of the tank will soon be silted up with solid sediment. Eventually, the effective volume of the tank will become smaller and smaller, and the tank will still have to be cleaned. So you first have to solve the problem of solid sedimentation and siltation, and then the problem of liquid extraction.
Backwash has been done before, but it didn’t work. The deposited material is a non-Newtonian fluid, so it cannot be backwashed at all. Moreover, the current jar cannot make holes at the bottom, there is no space, and it will also destroy the anti-corrosion inside the jar.
Option 1: Try to use a positive displacement pump, such as a diaphragm pump, which has a certain self-priming ability and a small NPSH, and can mix gas and liquid to a certain extent. ； Option 2: When using a submersible pump, the stirring blades are generally set near the bottom of the tank to prevent sedimentation. As long as a certain liquid level can be maintained, a submersible pump of a certain length cannot touch it.
Is there any other positive displacement pump besides the diaphragm pump? I asked about the diaphragm pump. There is always a problem with the materials and temperature that cannot be applied to our working conditions. The submersible pump cannot be used. Our mixing is double-layered and close to the tank wall, which will cause fighting.
Using a horizontal centrifugal pump plus self-priming function should be able to solve the problem