Application of beam thermal spraying technology in steel industry

       Information summary: The steam turbine rotor and diaphragm are cleaned by glass shot blasting. Because the steam turbine rotor and diaphragm are used under high temperature steam, oxide skin will be formed on the surface. If they are not cleaned in time, the normal operation of the unit will be affected. At present, most power plants use the method of blasting glass pellets for cleaning. This method uses glass pellets as abrasives, which will not cause great damage to the substrate, and can clean the oxide skin and embroidery at the same time. Valve accessories Spraying valves are also the main equipment of power plants, which often appear during use.

The steam turbine rotor and diaphragm are cleaned by glass shot blasting. Because the steam turbine rotor and diaphragm are used under high temperature steam, oxide skin will be formed on the surface. If they are not cleaned in time, the normal operation of the unit will be affected.



At present, most power plants use the method of blasting glass pellets for cleaning. This method uses glass pellets as abrasives, which will not cause great damage to the substrate, and can clean the oxide skin and embroidery at the same time.



  Valve accessories spraying



The valve is also the main equipment of the power plant. During the use process, the phenomenon of blowing corrosion and straining often occurs, which causes the valve to leak and affects the normal operation of the unit.



Using thermal spraying technology to spray a layer of cemented carbide on the surface of valve accessories (gate stem, valve core, valve seat) for repair or pre-protection, the hardness of the coating does not decrease significantly within 850 ℃, and it does not resist oxide skin erosion and cavitation. , water erosion, scratches, can increase the service life more than three times.



  Shaft parts, end caps, bushings, bushing spraying



Various shafts (such as coal mill gear shaft, induced draft fan main shaft, powder discharge fan main shaft



etc.), shaft sleeves, shafts and shaft sleeves of various pumps, babbitt alloy shoes, etc., will cause low operating efficiency of mechanical equipment due to wear and tear, frequent replacement and maintenance of workpieces, and increased energy consumption. After being repaired and strengthened by thermal spraying, the parts can reach or even exceed the service life of the new parts, which saves the cost and improves the efficiency of the power plant. If the packing bushing is treated with sprayed carbide or ceramic anti-wear treatment, it can increase the high life by five to eight times.