Hydrothermal gasification is process that uses supercritical water, in excess, to produce hydrogen and syngas from...

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Hydrothermal gasification is process that uses supercritical water, in excess, to produce hydrogen and syngas from heavy hydrocarbons in a pressurised flow reactor pipeline under high temperatures. The residence time for this type of processes will have a major impact on the process conversion and economics. Your company has decided to go ahead with investments of producing hydrogen from heavy oil using supercritical gasification. You have been asked to investigate the impact of temperature on the residence time for various reactor pipe designs. The reactor materials for this type of processes needs special consideration that design engineers will have to account for during the conceptual design phase. You are given 7 reactor pipe specs to analyse as shown in Table (1). Reactor A Reactor B Reactor C Reactor D Reactor E Reactor F Reactor G Length m 4 6. 10 12 14 Diameter 4 3.5 3 2.5 2 1.5 1 m For every reactor highlighted in Table 1, you are required to work with your design team to establish the relationship between reactor pipe residence time, (tr) and flowrate at different temperatures as requested below: 1. Calculate reactor pipe residence time fg at standard temperature and pressure assuming a volumetric flowrate of 1 m'/s. 2. Establish the relationship between the reactor pipe residence time tg when the reactor wall temperature is increased in the range of 100-800 °C assuming a volumetric flowrate of 1 m'/s. 3. Obtain a relationship for the volumetric flowrate (V = 0.5-1.5 m'ls) and the reactor residence time assuming a process temperature of 700 °C. 4. Assuming the company needs to inject air to reduce the energy requirements, via partial oxidation, Repeat steps 2 and 3 for pure air injections. 5. Summarize the results and make recommendations for achieving the optimum residence. Hydrothermal gasification is process that uses supercritical water, in excess, to produce hydrogen and syngas from heavy hydrocarbons in a pressurised flow reactor pipeline under high temperatures. The residence time for this type of processes will have a major impact on the process conversion and economics. Your company has decided to go ahead with investments of producing hydrogen from heavy oil using supercritical gasification. You have been asked to investigate the impact of temperature on the residence time for various reactor pipe designs. The reactor materials for this type of processes needs special consideration that design engineers will have to account for during the conceptual design phase. You are given 7 reactor pipe specs to analyse as shown in Table (1). Reactor A Reactor B Reactor C Reactor D Reactor E Reactor F Reactor G Length m 4 6. 10 12 14 Diameter 4 3.5 3 2.5 2 1.5 1 m For every reactor highlighted in Table 1, you are required to work with your design team to establish the relationship between reactor pipe residence time, (tr) and flowrate at different temperatures as requested below: 1. Calculate reactor pipe residence time fg at standard temperature and pressure assuming a volumetric flowrate of 1 m'/s. 2. Establish the relationship between the reactor pipe residence time tg when the reactor wall temperature is increased in the range of 100-800 °C assuming a volumetric flowrate of 1 m'/s. 3. Obtain a relationship for the volumetric flowrate (V = 0.5-1.5 m'ls) and the reactor residence time assuming a process temperature of 700 °C. 4. Assuming the company needs to inject air to reduce the energy requirements, via partial oxidation, Repeat steps 2 and 3 for pure air injections. 5. Summarize the results and make recommendations for achieving the optimum residence.

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