Experimental Study on Corrosion Characteristics of 1.25Cr-0.5Mo in the 1st-mathanator reactor for Synthetic Natural Gas according to Gas Compositions

Title & Authors
Experimental Study on Corrosion Characteristics of 1.25Cr-0.5Mo in the 1st-mathanator reactor for Synthetic Natural Gas according to Gas Compositions
Kim, Jin-Hyun; Cho, Honghyun;

Abstract
Recently, the operating conditions of the various mechanical structures have become more severe and the running time has become longer as the development of plant equipment increases with the introduction of high technology. Thus, the reliability of the system and its accessories is becoming a problem. Normally, synthetic natural gas (SNG) plants use 1.25Cr-0.5Mo or 2.25Cr-1Mo heat resistant steel according to the operating conditions. In this study, a lab-scale reactor was set up using 1.25Cr-0.5Mo steel, in order to carry out corrosion tests for producing synthetic natural gas. The corrosive characteristics were investigated under 1st-methanator operating conditions and fundamental data about the durability and reliability were obtained by using the experimental test. The analysis of results obtained on the durability of the reactor under emission and injection compositions showed that the hydrogen embrittlement caused by hydrogen and the oxidation corrosion caused by H2O had the most effect on the durability of 1.25Cr-0.5Mo steel in the SNG reactor. However, the hydrogen embrittlement and oxidation corrosion occurred simultaneously under emission conditions, so that the corrosion of the material increased suddenly after a long operating time. Besides, the corrosion of the 1.25Cr-0.5Mo steel under the injection composition was faster than that under the emission composition.
Keywords
Synthetic natural gas(SNG);1.25Cr-0.5Mo;$\small{1^{st}}$-Methanator;Composition;Corrosion;
Language
Korean
Cited by
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