| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 100 === In this thesis, we have presented a chemical process design and integration for the production of biogasoline from biomass. The goal is set at 10,000 tonnes/yr of biogasoline. The whole process integrates three sub-processes: (1) syngas production from the biomass (BtS), and (2) dimethyl ether production from syngas (StD), and (3) production of biogasoline from dimethyl ether (DtG). In particular, we have carried out a heat integration associated with its engineering economic evaluation for the“production of biogasoline from syngas (StD + DtG)”, compared the energy savings, yearly cost of manufacture and fossil energy ratio (FER). The results showed that the minimum approach temperature (ΔTmin = 5oC) between the hot and cold composite streams saves most with 89% hot-utility energy saving and 32% cold-utility energy saving, and the FER increased from 1.8 (base-case design) to 5.1. However, as seen from the economic analysis, we found that the yearly cost of manufacture and cost of biogasoline per liter are lowest using ΔTmin = 10oC. Consequently, we chose ΔTmin = 10oC as our final design scheme. The yearly cost of manufacture for ΔTmin = 10oC drops from US$17.0×106/yr (base-case design) to US$14.4×106/yr, cost of biogasoline per liter drops from US$0.97/L (base-case design) to US$0.79/L , and the FER rises from 1.8 to 4.7.
Two kinds of software were utilized in the research, Aspen Plus and SuperTarget. The former was used to implement the process synthesis, design, and simulation; the latter was used to perform the pinch analysis and the synthesis of heat-exchanger network.
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