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Experimental Study on Recycling of Used (Waste)Motor Oils Supercritical Water Gasification

Ghanbarzadeh, Shabnam | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52782 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Rajabi, Abbas; Tavakoli, Omid
  7. Abstract:
  8. The purpose of this study was to investigate experimentally and modeling the process of gasification with supercritical water using waste motor oil. The effect of four important and influential parameters on the process, Temperature (350-450° C), Reaction time (15-45 minutes), Oil-to-Water volume ratio (0.2-0.4) and type of catalyst Consumption (Ni- NaOH- Na2CO3) was evaluated. Experimental experiments were designed and performed on the Design Expert software. The experimental results showed that the purity of hydrogen in the gas stream is more dependent on the temperature parameter and the higher purity is obtained with increasing temperature. Subsequently, as the oil concentration increases, hydrogen production decreases and leads to methane production. The time parameter had no significant effect on the results but its increase with increasing temperature in addition to increasing the molar contribution of hydrogen led to increased hydrogen selectivity. Among the catalysts investigated, sodium hydroxide salt eliminated carbon dioxide gas and increased hydrogen, while nickel metal increased cold gas efficiency in addition to hydrogen. Results of statistical modeling of gasification efficiency and cold gas efficiency in Design expert software showed that the interaction of temperature and reaction time and the interaction of temperature and feed volume to water ratio respectively increase gasification efficiency and cold gas efficiency. A non-stoichiometric model for reactor modeling was developed in Aspen Plus software to simulate this process, and the results were validated with experimental results. For optimization, sensitivity analysis of hydrogen molar fraction, cold gas efficiency and energy consumption with respect to temperature variations (400–900 ° C) and feed-to-water volumetric ratio (0.1–0.9 ml oil / ml water) ) Done. The results showed that applying temperature of 650 ° C and oil / water volume ratio of 0.4, hydrogen molar fraction, cold gas efficiency and process energy consumption were 40%, 50% and 17.1 MJ / kg, respectively
  9. Keywords:
  10. Hydrogen ; Optimization ; Supercritical Water Gasification ; Waste Motor Oil ; Used Oil Recovery

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