Is it necessary to use a screw pump for the material fed into centrifugal atomization?
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Previously, when producing monosodium and disodium anhydrous phosphates, the slurry was fed into a centrifugal atomizer for drying using a pressure difference caused by the liquid level. Currently, screw pumps are used to transport the slurry in the production of monoammonium phosphate, as the slurry has a high temperature and concentration and contains some crystalline materials. Screw pumps have a short service life, and the maintenance and replacement of such pumps account for almost half of the downtime. Can using a centrifugal pump to transport materials cause significant damage to the atomizer due to unstable flow and pressure? My proposal was rejected by my superiors for the aforementioned reasons.
We use plunger pumps, which can operate in one while another is on standby, and the plungers can be replaced quickly.
Ammonium monophosphate is not pumped using screw pumps; in the past air atomization was used, while nowadays piston pumps are generally employed for high-pressure atomization at 8.0 MPa. The results achieved with air atomization are much better, as the particle surface area is larger and the drying rate is much higher. I’m not familiar with the situation regarding pentasodium, but it can be tried out. Ammonium phosphate was successfully utilized after 2002, by making use of ammonia synthesis pump systems.
Using a screw pump to control the stability of the feed flow is beneficial for the operation of the atomizer; this is indeed the case. Screw pumps are generally used for this purpose. If you have not been using it for a long time, it might be that your supplier made an incorrect choice, resulting in the pump not being able to meet the required operating conditions