Inner Spraying Device and Technology of Large Volume Steel Seamless Gas Cylinder

Abstract

The invention discloses an inner spraying process of a large volume seamless steel gas cylinder; before inner spraying treatment, 30-60 minutes of inner shot blasting cleaning is performed, the inner wall is washed for 2-3 times with water, high temperature steam is used for degreasing and drying; a standard sheet is used for contrasting and detecting whether the inner wall is up to SA2.5, and an ultraviolet lamp is used for detecting the inside of the gas cylinder; after the inner wall inspection is qualified, the gas cylinder is sent to an inner spraying room for inner spraying; the gas cylinder is sent to the inner spraying room, an electrostatic generator is turned on, working parameters aer set; the sprayed gas cylinder is cured, in the process of drying, drying furnace temperature difference must be controlled within 5 DEG C; and after the furnace temperature reaches 230 DEG C, the furnace temperature is maintained for 3-5 minutes. The invention also discloses a spraying device using the spray process. According to the spraying process, a layer of anticorrosive coating can be formed on the inner wall of the cylinder, direct contact of a filling medium the inner wall of the cylinder body can be effectively blocked, cylinder body corrosion caused by sulfides and hydrogen embrittlement gas in the medium can be avoided, and the service life and safety of the steel cylinder can be improved.

Description

technical field [0001] The invention relates to a large-capacity steel seamless gas cylinder internal spraying device and its technology. Background technique [0002] During the regular inspection of steel cylinders containing compressed natural gas, it was found that the inner walls of the steel cylinders were corroded more seriously, and the corrosion of the steel cylinders was mainly caused by the H in the compressed natural gas under pressure. 2 and S in the steel cylinder material, produce H in a certain environment 2 S corrosion leads to hydrogen embrittlement, corrosion cracks, and bulging of the steel cylinder, which leads to the failure of the steel cylinder and scrapping. [0003] In order to solve the above problems, there are two main solutions commonly used at present. One is to passivate the inner wall of the gas cylinder to form a dense passivation film on the inner wall of the gas cylinder, but the passivated gas cylinder is still There are cases where cer...

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Problems solved by technology

[0002] During the regular inspection of steel cylinders containing compressed natural gas, it was found that the inner walls of the steel cylinders were corroded more seriously, and the corrosion of the steel cylinders was mainly caused by the H in the compressed natural gas under pressure. 2 and S in the steel cylinder material, produce H in a certain environment 2 S corrosion leads to hydrogen embrittlement, corrosion cracks, and bulging of steel cylinders, resulting in failure of steel cylinders and scrapping

[0003] In order to solve the above problems, there are two main solutions commonly used at present. One is to passivate the inner wall of the gas cylinder to form a dense passivation film on the inner wall of the gas cylinder, but the passivated gas cylinder is still There are cases where certain gas components can be adsorbed, and the passivation film on the inner wall of the gas cylinder will be activated under certain conditions and lose its passivation state, which has no protective effect; the second is to spray paint on the inner wall of the gas cylinder to achieve corrosion resistance Anti-pollution and other purposes, but limited by spraying paint and spraying process, the internal spray coating obtained by the traditional spraying method is prone to bubbles, cracks and shedding under pressure during use, which affects its protective effect on gas cylinders

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