Ball Valve For Coal Chemical Industry

Product Introduction：

Coal chemical industry refers to the process of converting coal into gas, liquid and solid fuels and chemicals through chemical processing with coal as raw material.It mainly includes coal gasification, liquefaction and distillation, as well as tar processing and carbide acetylene chemical industrythe coal water slurry gasification process is to oxidize and reduce the coal water slurry and oxygen under high temperature and high pressure, so that part of the coal can be converted into gas.The coal gas is sent out as the syngas saturated with water vapor after being washed, washed and dusted in the cold water bath, while some unburned carbon and non-combustible ash in the coal form slag under high temperature, which is cooled by water and broken by the slag breaker, and discharged into the slag pool regularly through the lock bucket.The whole production process not only contains high temperature, high pressure, flammable and explosive gas medium and solid particle medium, but also requires the whole slag removal and collection process to be subject to program control.Metal Seated Ball Valve for coal water slurry is mainly applicable to high temperature, high pressure, strong erosion, strong corrosion and other working conditions，There are many technical difficulties in the design and manufacturing process.

Technical characteristics of special Metal Seated Ball Valve for coal chemical industry：

1、The sealing pressure is high，Metal Seated Ball Valve for coal water slurry working condition uses metal material as the sealing surface, and the required sealing pressure is much higher than that of Soft Seated，Therefore, it is very important to ensure proper sealing pressure from the design, improve the shape and position tolerance of parts and improve the surface finish requirements.

2、The surface hardness of the ball is high,as well as the pulverized coal particles，Under this working condition, the hardness layer of the ball surface is required to have a high hardness when the valve is closed，Otherwise, when the valve is opened, pulverized coal particles will be embedded on the surface of the ball, thus damaging the surface of the ball and affecting the overall sealing performance of the valve.

3、The bonding strength of the spray welding layer is high, and the flow speed of pulverized coal in the pipeline is very fast，Therefore, the sealing surface of the ball must have high hardness and strength，At the same time, the sealing material to be sprayed and welded must have high bonding strength with the base material, as well as the strength of the base material itself, so that the spray welding layer cannot fall off from the surface of the base and lose its sealing performance.

4、Self-Cleaning Function，The coal slurry has strong adsorption and is easy to adhere to the surface of the ball.During the opening and closing of the valve, the medium particles are brought between the sealing surfaces of the valve seat and the ball, damaging the sealing pair between the ball and the valve seat, thus affecting the sealing performance of the valve and greatly shortening the service life of the valve，The development of the new technology "scraper valve seat" has a good "self-cleaning" function, thus ensuring that the ball and the valve seat sealing pair are not damaged.

5、Difficult to Machine，The sealing surface of the Metal Seated Ball Valve used in coal water slurry working condition is made of ultra-hard alloy material，Thus it can not be processed with ordinary tools, even if it can be processed, its processing accuracy can not meet the requirements，nd the processing equipment is also required to have sufficient strength，Therefore, it is very important to select a suitable tool，In order to ensure the excellent sealing performance of the valve, the sealing surface of the valve also needs high-precision grinding.