Material optimization of valve core and seat of coal gasification black water valve
In order to optimize the coal gasification black water valve, a company optimized the material of the valve core and valve seat, and used the valve core and valve seat of the black water angle valve to use integrally sintered cemented carbide.
The black water angle valve is the key valve in the GE coal-water slurry coal gasification unit. The high-pressure black water angle valve is mainly installed and used on the pipelines from the bottom of the gasifier cooling chamber to the high-pressure flash tank and the bottom of the scrubber to the high-pressure flash tank. . The operating environment of the valve is extremely harsh. Due to the flash evaporation of a large amount of process gas, the speed of the black water flowing through the valve core of the throttling element of the angle valve is very high, resulting in serious erosion and wear of the valve trim. Therefore, the flow field distribution and flow velocity distribution of the fluid in the valve have a huge impact on the service life of the throttling components such as the valve body and the valve core valve seat of the black water angle valve. Therefore, it is very urgent to optimize the material of the valve core and seat of the black water valve.
The company specially found us to seek the material optimization of the valve core and valve seat of the black water valve. After on-site investigation and collecting information, it is recommended to make the valve core valve seat with integral sintering of cemented carbide, and the hardness is not less than HRC60. The flow channel behind the valve seat is lined with a solid sintered cemented carbide at an appropriate distance. At present, domestic and foreign angle valve manufacturers have lined a section of cemented carbide tube behind the valve seat flow channel, that is, the diffusion section, and the hardness is not less than HRC60. The remaining runners are sprayed with tungsten carbide or hard STL to reduce erosion and cavitation damage to pipe internals. The cemented carbide should be made of solid sintered tungsten carbide to improve the density of the material and increase the adhesion between grains, thereby ensuring better hardness and strength. Extends the life of the coal gasification black water valve, so the tungsten carbide valve core valve seat is yyds.
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