Thermodynamic analysis of small-scale dimethyl ether (DME) and methanol plants based on the efficient two-stage gasifier

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Models of dimethyl ether (DME) and methanol synthesis plants have been designed by combining the features of the simulation tools DNA and Aspen Plus. The plants produce DME or methanol by catalytic conversion of a syngas generated by gasification of woody biomass. Electricity is co-produced in the plants by a gas engine utilizing the unconverted syngas. A two-stage gasifier with a cold gas efficiency of 93% is used, but because of the design of this type of gasifier, the plants have to be of small-scale (5 MWth biomass input). The plant models show energy efficiencies from biomass to DME/methanol + electricity of 51–58% (LHV), which shows to be 6-8%-points lower than efficiencies achievable on large-scale plants based on torrefied biomass pellets. By using waste heat from the plants for district heating, the total energy efficiencies become 87–88%.
Original languageEnglish
JournalEnergy
Publication date2011
Volume36
Issue10
Pages5805-5814
ISSN0360-5442
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 9

Keywords

  • Thermal gasification of biomass
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