메탄올 연료 개질 플랜트의 다단연소기 시동 전략

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 30; no. 3; pp. 201 - 208
• Main Authors: 지현진(HYUNJIN JI), 백경돈(KYUNGDON BAIK), 양성호(SUNGHO YANG), 정승교(SEUNGKYO JUNG)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2019
• Subjects: 기계공학; Multi-stage burner(다단연소기); Methanol(메탄올); Start-up(시동); Heat exchanger(열교환기); Fuel reforming plant(연료 개질 플랜트)
• ISSN: 1738-7264; 2288-7407

Recently, a fuel reforming plant for supplying high purity hydrogen is being applied to submarines. Since steam reforming is an endothermic reaction, it is necessary to continuously supply heat to the reactor. A fuel reforming plant for a submarine needs a multi-stage burner (MSB) to acquire heat and convert the combustion gas to $CO_2+H_2O$. The MSB has problems that the combustion imbalance occurs during start-up due to the temperature restriction of the combustion gas. This problems can be solved by burning $H_2O$ together with fuel and $O_2$. In this study, the simulation results of MSB were analyzed to determine the optimum flow rate of $H_2O$ supplied to the 6-stage burner. When the flow rate of $H_2O$ was low, combustion was concentrated on the burner#6 in comparison with the burner#1-#5. This combustion concentration improved as the supply amount of $H_2O$ increased. As a results, it was necessary to supply at least 4.9 kmol/h of $H_2O$ (per 1 kmol/h of fuel) to burner#1 in order to maintain the combustion gas temperature of each stage at $750^{\circ}C$ and to convert the final stage burner gas composition to $CO_2+H_2O$.