Corrosion of desulfurization pumps

Provide a brief introduction to the operating conditions, medium, temperature, etc.

Pay attention to the bubbling on the pump cover; what could be the cause?

Is there a clicking sound inside the pump chamber while the pump is running?

Given that cavitation can explain the impeller, what about the rear pump cover? More pits, and bumps as well

The pump cover may be due to quality issues with the casting; what material is the pump cover made of?

This is typically caused by substandard materials. The content of the ready-to-use material is fine, but there are issues with casting.

We know that this is the pump used to transport the desulfurized wet flue gas in the desulfurization process. The wet flue gas desulfurization process has a high efficiency in removing SO2 from flue gas, but its efficiency in removing SO3, which is the main component causing flue gas corrosion, is relatively low, at around 20%. Therefore, after flue gas desulfurization, the risk of equipment corrosion is not eliminated ； On the contrary, the conditions of the flue gas after desulfurization (low temperature, high humidity, etc.) may further exacerbate corrosion. As can be seen from the image, the pump impeller suffers from erosion of the metal by the medium, caused by the combined effect of accelerated flow and impact pressure from the wet flue gas. When metal corrosion accelerates to a certain extent, the decrease in surface strength causes small metal fragments to impact the pump cover, resulting in local deep pits. This can be seen from the condition of impeller corrosion in the image. The impact marks on the pump cover indicate that it is not due to medium corrosion.

The main issues are corrosion caused by desulfurization slurry and wear due to particulates; it is recommended to carry out repairs promptly