Hard-sealing spherical valve suitable for water-coal-slurry working condition

Abstract

Provided is a hard-sealing spherical valve suitable for a water-coal-slurry working condition. The water-coal-slurry is featured by being high in corrosivity and temperature, great in erosion and high in particle hardness. The method comprises an end cover connected with a belleville spring which is connected with a pressing ring. The pressing ring is connected with a sealing ring. The sealing ring is connected with a valve seat. The valve seat is connected with a sphere. A shaft sleeve sleeves the outside of the sphere. A pivot joint externally sleeves the shaft sleeve. Due to the fact that a sealing surface is made by metal material, required seal pressure is much higher than that of soft sealing. The structure of a combined valve seat with a spring and a valve seat is utilized. Through a high-load belleville spring, the initial preload sealing pressure is provided. The linear expansion influence of metal material at high temperature is taken into consideration. A combined design mode of serial connection of the belleville spring is utilized so that the initial prestressing force provided by the belleville spring is satisfied. The invention is applied to the hard-sealing spherical valve suitable for the water-coal-slurry working condition.

Description

[0001] Technical field: [0002] The invention relates to a hard-sealed ball valve suitable for coal-water slurry working conditions. [0003] Background technique: [0004] With the development of science and technology and the improvement of people's lives, it is very important to develop and utilize a new generation of clean and efficient gasification technology for the rational use of various energy sources in our country. At present, coal-water slurry pressurized gasification technology has been used to synthesize related products at home and abroad. This technology uses various carbon and hydrogen materials as raw materials (lignite, bituminous coal, anthracite, peat). The process is that the raw materials need to go through the necessary powder making and slurrying, and then prepare water-based or oil-based slurry, after stirring, storage, transportation, and then sent to a special nozzle for atomization, in the entrained bed gasification furnace (about 1400 ℃) Intermed...

AI Technical Summary

Problems solved by technology

[0008] (2) The surface hardness of the sphere is high. The hardness of the pulverized coal particles is relatively high. Under this working condition, the hardness layer on the surface of the sphere is required to have a high hardness when the valve is closed. Otherwise, there will be pulverized coal when the valve is opened. Particles are embedded on the surface of the sphere, thereby destroying the surface of the sphere, so as to affect the overall sealing performance of the valve

[0011] (5) Difficult to process Since the sealing surfaces of hard-sealed ball valves used in coal-water slurry conditions are all made of super-hard materials or surface hardened, they cannot be processed with ordinary tools, and even if they can be processed, the processing accuracy cannot meet the requirements, and processing equipment is also required Has enough strength, so it is very important to choose the right knife

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