fuyangby@126.com
86 15188770013
fuyangby@126.com
86 15188770013
Failure mechanism of overflow components in slurry pump:
The Crl5Mo3 overflow component commonly used in slurry pumps is subjected to high-speed, high temperature, strong alkaline and hard particle carrying alumina slurry erosion during operation. Under the combined action of erosion wear, strong alkaline corrosion, and cavitation, the surface material of the overflow component is severely damaged, leading to failure. Slurry pump manufacturer
Under normal working conditions, the most severely worn flow components include the pump vortex casing, front and rear protective plates, impeller, shaft seal, shaft sleeve, suction port, etc. The impeller is mainly subjected to low angle impact, which leads to cutting damage, the pump casing is mainly subjected to high angle impact, which leads to metal surface falling off, and the flow channel wall is mainly fatigued due to long-term repeated impact of solid particles.
The surface material of the overcurrent component is severely corroded by carbide phase boundaries, causing the carbides to lose the support of the matrix and fracture during erosion and wear. The matrix undergoes alkali embrittlement cracks due to strong alkaline corrosion, namely anodic dissolution type stress corrosion cracking, which extends from the surface to the sub surface in a network distribution, greatly peeling the matrix and peeling off during erosion and wear. If the material of the overcurrent component has insufficient resistance to high temperature and strong alkaline corrosion, its anodic activation, dissolution, corrosion and peeling are also one of the reasons for failure.
The bubbles in the slurry rapidly shrink and collapse in certain parts of the flow passage due to high pressure, while the liquid fills the gaps at high speed, forming a water hammer. This high-frequency and high-speed micro jet impact causes the surface metal of the flow passage passage to peel due to impact fatigue, resulting in material loss and failure. Usually, cavitation occurs at the outlet of the impeller and the inlet of the pressurized water chamber.
Among various failure factors, cavitation damage is closely related to the solid-liquid flow pattern of the slurry and the structural design of the slurry pump, but not to the properties of high chromium cast iron materials. Reference [1] believes that the failure of flow components such as the pump casing and impeller of the slurry pump is a comprehensive effect of strong alkaline corrosion and erosion wear, which promote each other
The role played by corrosion is even more important. The author believes that under certain operating conditions, it is worth studying the role of corrosion and wear in the weight loss of overcurrent components.
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