Hydrothermal Gasification of Waste Biomass: Process Design and Life Cycle Asessment
Artikel i vetenskaplig tidskrift, 2009

A process evaluation methodology is presented that incorporates flowsheet mass and energy balance modeling, heat and power integration, and life cycle assessment. Environmental impacts are determined by characterizing and weighting (using CO2 equivalents, Eco-indicator 99, and Eco-scarcity) the flowsheet and inventory modeling results. The methodology is applied to a waste biomass to synthetic natural gas (SNG) conversion process involvingacatalytic hydrothermal gasification step. Several scenarios are constructed for different Swiss biomass feedstocks and different scales depending on logistical choices: large-scale (155 MWSNG) and small-scale (5.2 MWSNG) scenarios for a manure feedstock and one scenario (35.6MWSNG) for awoodfeedstock. Process modeling shows that 62% of the manure’s lower heating value (LHV) is converted to SNG and 71% of wood’s LHV is converted to SNG. Life cycle modeling shows that, for all processes, about 10% of fossil energy use is imbedded in the produced renewable SNG. Converting manure and replacing it, as a fertilizer, with the process mineral byproduct leads to reduced N2O emissions and an improved environmental performance such as global warming potential: -0.6 kgCO2eq./MJSNG vs -0.02 kgCO2eq./MJSNG for wood scenarios.

synthetic natural gas

process design

life cycle assessment

bio methane

Författare

Jeremy S. Luterbacher

Ecole Polytechnique Federale De Lausanne

Cornell University

Morgan Fröling

Chalmers, Kemi- och bioteknik, Kemisk miljövetenskap

Frederic Vogel

Paul Scherrer Institut

F. Marechal

Ecole Polytechnique Federale De Lausanne

Jefferson W. Tester

Massachusetts Institute of Technology (MIT)

Environmental Science & Technology

0013-936X (ISSN) 1520-5851 (eISSN)

Vol. 43 1578-1583

Ämneskategorier

Kemiska processer

Annan naturresursteknik

Miljövetenskap

DOI

10.1021/es801532f