Title:
Polygeneration Systems for the Provision of SNG, Power and Heat - A Concept Study
Author(s):
Rönsch, S.
Document(s):
Paper
Abstract:
To reduce anthropogenic greenhouse gas emissions on the one hand and to meet varying energy prices on the other hand, there is an intensive discussion (e.g. “Renewable energy roadmap”) concerning alternative and sustainable energy sources. One focus is the energetic use of biomass and the provision of biofuels respectively. So far, different routes for the provision of biofuels are under discussion as well as under development. Nevertheless, it is still an open question which biofuel is the most promising option under which circumstances and for which market. Due to high overall efficiencies, especially the thermochemical conversion pathway of solid biofuels into the natural gas substitute Bio-SNG (Synthetic Natural Gas) seems to be a promising way in this respect. Against this background, the Bio-SNG production is analysed with special focus on the co-generation of heat and power - so called polygeneration. Thereby, the use of a gas slip stream in a gas engine / a gas turbine and the use of process heat in an organic rankine or steam cycle might be promising to improve the competitiveness of the overall Bio-SNG production process. Based on mass and energy balances calculated with help of a process simulation tool developed with the software MATLAB Simulink® different process configurations are analysed and discussed from an energetic (exergetic efficiency), economic (Bio-SNG production costs) and environmental (Bio-SNG greenhouse gas emissions) point of view. Thereby, polygeneration concepts profit by an increase of the exergetic efficiency if process heat is used to produce electrical power in a steam cycle. With the exergetic efficiency as well the economic and environmental process efficiency is improved and an advantage in comparison to the monogeneration of SNG is achieved by the combined generation of SNG, power and heat.
Keywords:
gasification, polygeneration, bio-syngas, biomethane, bio-SNG, flow sheet
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Gasification for power, CHP and polygeneration
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.3.30
Pages:
1476 - 1479
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.3.30
Price:
FREE
