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니켈촉매를 이용한 온도 및 공간속도 변화에 따른 메탄화 반응 특성
김수현(Kim, Sy-Hyun),유영돈(Yoo, Young-Don),류재홍(Ryu, Jae-Hong),변창대(Byun, Chang-Dae),임효준(Lim, Hyo-Jun),김형택(Kim, Hyung-Taek) 한국신재생에너지학회 2010 신재생에너지 Vol.6 No.4
Syngas from gasification of coal can be converted to SNG(Synthesis Natural Gas) through gas cleaning, water gas shift, CO₂ removal, and methanation. One of the key technologies involved in the production of SNG is the methanation process. In the methanation process, carbon oxide is converted into methane by reaction with hydrogen. Major factors of methanation are hydrogen-carbon oxide ratio, reaction temperature and space velocity. In order to understand the catalytic behavior, temperature programmed surface reaction (TPSR) experiments and reaction in a fixed bed reactor of carbon monoxide have been performed using two commercial catalyst with different Ni contents (Catalyst A, B). In case of catalyst A, CO conversion was over 99% at the temperature range of 350{sim}420?C and CO conversions and CH₄ selectivity were lower at the space condition over 3000 1/h. In case of catalyst B, CO conversion was 100% at the temperature over 370?C and CO conversions and CH₄ selectivity were lower at the space condition over 4700 1/h. Also, conditions to satisfy CH₄ productivity over 500 ml/h.g-cat were over 2000 1/h of space velocity in case of catalyst A and over 2300 1/h of space velocity in case of catalyst B.
1 Nm3/h 규모 합성천연가스(SNG) 합성 시스템의 운전 특성
김진호 ( Jin Ho Kim ),강석환 ( Suk Hwan Kang ),류재홍 ( Jae Hong Ryu ),이선기 ( Sun Ki Lee ),김수현 ( Su Hyun Kim ),김문현 ( Mun Hyun Kim ),이도연 ( Do Yeon Lee ),유영돈 ( Yong Don Yoo ),변창대 ( Chang Dae Byun ),임효준 ( Hyo Jun 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
In this work, we proposed the three different reactor systems for evaluating of synthetic natural gas(SNG) processes using the synthesis gas consisting of CO and H2 and reactor systems to be considered are series adiabatic reaction system, series adiabatic reaction system with the recirculation and cooling wall type reaction system. The maximum temperature of the first adiabatic reactor in series adiabatic reaction system raised to 800. From the these results, carbon dioxide in product gas as compared to other systems was increased more than that expected due to water gas shift reaction(WGSR) and the maximum CH4 concentration in SNG was 90.1%. In series adiabatic reaction system with the recirculation as a way to decrease the temperature in catalyst bed, the maximum CH4 concentration in SNG was 96.3%. In cooling wall type reaction system, the reaction heat is absorbed by boiling water in the shell and the reaction temperature is controlled by controlling the amount of flow rate and pressure of feed water. The maximum CH4 concentration in SNG for cooling wall type reaction system was 97.9%. The main advantage of the cooling wall type reaction system over adiabatic systems is that potentially it can be achieve almost complete methanation in one reactor.