Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Start-up Strategy of Multi-Stage Burner for Methanol Fuel Reforming Plant

메탄올 연료 개질 플랜트의 다단연소기 시동 전략

  • Received : 2019.02.25
  • Accepted : 2019.06.30
  • Published : 2019.06.30
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Abstract

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 $CO_2+H_2O$.

Keywords

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Fig. 1. Configuration of multi-stage burner for fuel reforming plant

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Fig. 2. ASPEN plus model for multi-stage burner

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Fig. 3. MeOH mole flow rate (kmol/h) at each mixer as function of H2O feed rate (kmol/h) at mixer#1

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Fig. 4. O2 mole flow rate (kmol/h) at each mixer as function of H2O feed rate (kmol/h) at mixer#1

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Fig. 5. CO2 mole flow rate (kmol/h) at each mixer as function of H2O feed rate (kmol/h) at mixer#1

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Fig. 7. Exhaust gas temperature at burner#6 as function of H2O feed rate (kmol/h) at mixer#1

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Fig. 6. H2O mole flow rate (kmol/h) at each mixer as function of H2O feed rate (kmol/h) at mixer#1

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Fig. 8. H2O temperature at each HEX as function of H2O feed rate (kmol/h) at mixer#1

Table 1. Simulation condition for multi-stage burner

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