Heat integration assessment for the conceptual plant design of synthetic natural gas production from supercritical water gasification of spirulina algae

Mohamed Magdeldin, Thomas Kohl, Cataldo De Blasio, Mika Järvinen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Hydrothermal processing of biomass, and in particular supercritical water gasification, SCWG, has illustrated the potential to counter technical barriers that continue to face the wide deployment of biomass based energy systems. A conceptual plant flow sheet for SCWG of spirulina algae feedstock is developed on Aspen plus® for synthetic natural gas production. The advantageous reactor system configuration at 600°C for higher organic conversion, nutrient separation and the energetic polygeneration of chemical fuels, electricity and thermal heat, is integrated in the process layout with subsequent gas purification, mechanical power extraction and a downstream methanation reactor for indirect production. The design and synthesis for the process blocks, components and equipment was based on operational data for referenced pilot or commercial units, and the pinch analysis method was used to assess the minimum plant utility demand as well as develop the heat exchanger network. 60.7% and 46.9% were recorded for the overall energetic and exergetic evaluation of the plant respectively. An alternative plant design was assessed at a reactor temperature of 450°C to favour direct methane production from the SCWG reactor and with the exclusion of mechanical power extraction for better heat recovery. The alternative design recorded energetic and exergetic efficiencies of 68.9% and 57.4% respectively.

Original languageEnglish
Title of host publicationECOS 2015 - 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
ISBN (Electronic)9782955553909
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Pau, France
Duration: 29 Jun 20153 Jul 2015
Conference number: 28
https://ecos2015.sciencesconf.org/

Conference

ConferenceInternational Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Abbreviated titleECOS
CountryFrance
CityPau
Period29/06/201503/07/2015
Internet address

Keywords

  • Conceptual process design
  • Pinch analysis
  • SCWG
  • SNG
  • Spirulina algae
  • Supercritical water gasification
  • Synthetic natural gas

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