OSAKA FUJI Corporation is also involved in technological development in the energy field. For example, we offer thermal spraying for boiler facilities and gas turbine components, including on-site construction at heat power plants. With the economic development of emerging nations, we expect that there will be increasing demand for our technology in the energy field. This is a field in which we will be proactive about expanding the possibilities that our technologies hold.
BOILER CONSTRUCTION IN A HEAT POWER PLANT (thermal spraying)
In the power station field, thermal spray coatings are applied as measures to prevent damage to boiler tubes used in heat power plants. While the form that such damage takes differs according to the fuel and the atmosphere in the furnace, its causes can be broadly divided into two categories, namely, hot corrosion and erosion.
High temperature corrosion resistance
Forms of High temperature corrosion include sulfate-, chloride-, and vanadium-induced corrosion. To protect against such forms of corrosion, a nickel-alloy based thermal spray coating - which has excellent corrosion resistance in the corrosive environment inside the furnace - is applied to many boilers. Moreover, depending on the cause of the corrosion, corrosive agents may penetrate the thermal spray coating through pores in the coating. As this may cause generating tubes to corrode, a sealing agent is sometimes applied over the thermal spray coating.
In fluidized bed combustion boilers the thickness of generating tubes is reduced due to erosion by the fluidized material. To prevent against such erosion, CrC-based cermets are applied, contributing to extending generating tube lifetime.
Automatic spraying of a boiler panel by robot
Manual spraying of a boiler panel
THERMAL SPRAYING TO GAS TURBINE BLADES
Insulating gas turbine components using high velocity oxy-fuel spraying and spraying to provide resistance to high-temperature oxidation