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http://dx.doi.org/10.21289/KSIC.2021.24.6.773

A Study on the Internal Flow Analysis of High-pressure Shut-off Valve for CNG Charging Station Piping System  

Chin, Do-Hun (Dept. of Industrial Health, Catholic University of Pusan)
Publication Information
Journal of the Korean Society of Industry Convergence / v.24, no.6_2, 2021 , pp. 773-779 More about this Journal
Abstract
CNG, which has recently been attracting attention as an alternative fuel in the transportation field to reduce emissions caused by global warming, is natural gas with abundant reserves and mainly composed of methane. Being in a gaseous state, natural gas requires the compression and liquefaction processes for transportation. Until now, general shut-off valves for liquid and gas piping have been developed in Korea, but there are few studies on shut-off valves for high pressures of about 200 bar. Currently, research on the flow analysis of valves is being actively conducted around the world. However, there are relatively many studies on large valves such as low-pressure valves or shipbuilding and marine, and the safety factor through structural analysis to check the structural integrity of the valve is checked at the design stage. Since it is necessary to have a fast response speed while minimizing pressure and speed loss due to flow change, basic research was conducted on the flow analysis of the valve to secure design data, and the numerical analysis was performed on high-pressure automatic shut-off valves applied to CNG refueling stations. After securing the basic valve shape through reverse engineering for advanced products, we compared the valve flow coefficient Cv coefficient with advanced products. As a result, it was found that the reverse engineering model was at the level of about 60%. However, we compared the Cv coefficient by modifying the reverse engineering model, and the result showed that it was improved to about 96%.
Keywords
CNG Station; Shut-Off Valve; Numerical Analysis;
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