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Pump and valve industry

Pumps are one of the commonly used equipment in the machinery industry and can be widely used in chemical, petroleum, mining, ship, food, medical, food, papermaking and other industries. Pumps are also widely used in the power sector, such as deep well pumps of water source, boiler feed pumps, circulating water pumps, relay water pumps, drainage pumps, ash slag pumps, oil pumps, coal water pumps, etc. Since the impeller and other components of the centrifugal pump work at high speed, cavitation and wear are severe, and its failure and shutdown of repairs have caused great economic losses to the power plant.

Therefore, in order to extend the life of the screw pump, it is necessary to improve the wear resistance of the screw pump stator. So, how to improve the wear resistance of the stator? First, conduct basic inspection and evaluation of the stator, determine the parts and degrees that need to be repaired, and repair them with wear-resistant materials in a timely manner to improve its wear resistance. The worn stator rotor is repaired by thermal spraying such as plasma or flame, mixed with chromium oxide, alumina and zirconium oxide into agglomerated ceramic powder. After the coating is cooled, professional tools and technologies are used to cut, grind, polish and other processing of the stator rotor, and the repaired stator is strictly tested and inspected to ensure that its performance and quality meet the requirements. The coating coated with agglomerated powder composed of chromium oxide, alumina, and zirconia has properties such as wear resistance, hard surface wear, corrosion wear, and cavitation wear resistance. Using it to repair the rotor of the screw pump can improve the wear resistance of the screw pump rotor and extend its service life.

Solution:

The application of thermal spraying technology in the pump and valve industry is mainly reflected in the following aspects:

‌wear-resistant coating‌: Thermal spraying technology can significantly improve the wear resistance of pump and valve components. By using high hardness and low porosity coating materials, such as nickel-based alloys, cobalt-based alloys, carbides, oxides, etc., it can effectively reduce friction and extend the service life of the pump and valves. For example, the tungsten carbide coating can obtain hardness up to HV1200 through HVOF spraying method and have high temperature resistance of 850°C, which significantly improves the wear resistance, corrosion resistance and oxidation resistance of pump and valve components.
‌Heat-resistant coating‌: The pump and valve components in high-temperature working environments, such as boiler combustion chambers or high-temperature combustion valves, can provide protection with heat-resistant coatings. These coatings usually have high melting points and low thermal conductivity, which can remain stable at high temperatures and extend the service life of the pump and valves.
‌Thermal Insulation Coating‌: Thermal Insulation Coating (also known as thermal barrier coating) is used to reduce the heat transfer of pump and valve components during the working process and reduce the working temperature of the substrate. These coating materials such as alumina, CaO, MgO, CeO2 and stable zirconia have high melting point and low thermal conductivity, and can provide effective thermal insulation protection in high temperature environments.
‌Repair and extend service life‌: Thermal spraying technology can perform on-site repairs for worn or damaged pump and valve components. For example, the use of oxyacetylene flame spraying and plasma spray welding technology can significantly improve the service life of the pump and valve sealing surface, reduce the number of repairs, and reduce the maintenance costs.

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