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The abrasive wear of solid particles is
the root of the difference between the design of slurry pumps and their
applications in centrifugal slurry pumps. Wear is a complex phenomenon
that depends on the inherent characteristics of the pump and the pumped
slurry. For many years at home and abroad Scholars have been conducting
theoretical and experimental research on the wear mechanism. However, it
is still not fully understood.
Slurry pump wear has many factors, and
the wear mechanisms of different parts and parts are not the same, but
in general it can be summarized into three categories:
1. Erosion and wear
During the operation of the slurry pump,
the solid particles carried in the liquid impact the surface of the
flow-through component at a certain speed, causing material loss.
According to the analysis of the worn surface of the failed component,
the erosion wear mechanism can be divided into cutting wear, deformation
fatigue wear and cutting + deformation coincident wear. The failure
analysis of the volute and guard plate of the slurry pump for iron ore
shows that the cutting mechanism is the main reason for the wear of the
volute, and the deformation fatigue wear is the main reason for the wear
of the guard plate.
2. Cavitation damage
During the operation of the pump, in a
local area of the flow-through component (usually behind the impeller
inlet), for some reason, when the absolute pressure of the pumped liquid
drops to the vaporization pressure at the current temperature, the
liquid starts there. Vaporization, producing steam, forming bubbles.
These bubbles flow forward with the liquid, and when reaching a certain
high pressure, the bubbles shrink sharply and even collapse. While the
bubbles are condensing, the liquid particles fill the voids at a high
speed and have a strong impact on the metal surface. The metal surface
will peel off due to fatigue caused by this impact, causing material
loss. In severe cases, the metal surface will appear honeycomb.
Generally, cavitation occurs at the exit of the impel.
