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Turbomachinery in Biofuel Production

Technical Report:

Abstract

The aim for this study has been to evaluate the integration potential of turbo-machinery into the production processes of biofuels. The focus has been on bio-fuel produced via biomass gasification; mainly methanol and synthetic natural gas. The research has been divided into two parts; gas and steam turbine applications. Steam power generation has a given role within the fuel production process due to the large amounts of excess chemical reaction heat. However, large amounts of the steam produced are used within the production process and is thus not available for power production. Therefore, this study has been focused on lowering the steam demand in the production process, in order to increase the power production. One possibility that has been evaluated is humidification of the gasification agent in order to lower the demand for high quality steam in the gasifier and replace it with waste heat. The results show that the power penalty for the gasification process could be lowered by 18-25%, in the specific cases that have been studied. Another step in the process that requires a significant amount of steam is the CO{sub 2}-removal. This step can be avoided by adding hydrogen in order to convert all carbon into  More>>
Authors:
Publication Date:
Jan 15, 2011
Product Type:
Technical Report
Report Number:
TRITA-CHE-2011-2
Resource Relation:
Other Information: ISSN 1654-1081; Thesis or Dissertation; TH: Licentiate thesis (TeknL); 50 refs., 10 figs, 12 tabs.
Subject:
09 BIOMASS FUELS; BIOMASS; METHANOL FUELS; STEAM TURBINES; POWER GENERATION; GASIFICATION; BIOFUELS; GAS TURBINES
OSTI ID:
1008077
Research Organizations:
KTH Royal Inst. of Technology, Stockholm (Sweden). School of Chemical Science and Engineering, Dept. of Chemical Engineering and Technology, Energy Processes
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ISBN 978-91-7415-835-9; TRN: SE1107042
Availability:
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28901
Submitting Site:
SWD
Size:
39 p. pages
Announcement Date:
Mar 14, 2011

Technical Report:

Citation Formats

Goerling, Martin. Turbomachinery in Biofuel Production. Sweden: N. p., 2011. Web.
Goerling, Martin. Turbomachinery in Biofuel Production. Sweden.
Goerling, Martin. 2011. "Turbomachinery in Biofuel Production." Sweden.
@misc{etde_1008077,
title = {Turbomachinery in Biofuel Production}
author = {Goerling, Martin}
abstractNote = {The aim for this study has been to evaluate the integration potential of turbo-machinery into the production processes of biofuels. The focus has been on bio-fuel produced via biomass gasification; mainly methanol and synthetic natural gas. The research has been divided into two parts; gas and steam turbine applications. Steam power generation has a given role within the fuel production process due to the large amounts of excess chemical reaction heat. However, large amounts of the steam produced are used within the production process and is thus not available for power production. Therefore, this study has been focused on lowering the steam demand in the production process, in order to increase the power production. One possibility that has been evaluated is humidification of the gasification agent in order to lower the demand for high quality steam in the gasifier and replace it with waste heat. The results show that the power penalty for the gasification process could be lowered by 18-25%, in the specific cases that have been studied. Another step in the process that requires a significant amount of steam is the CO{sub 2}-removal. This step can be avoided by adding hydrogen in order to convert all carbon into biofuel. This is also a way to store hydrogen (e.g. from wind energy) together with green carbon. The results imply that a larger amount of sustainable fuels can be produced from the same quantity of biomass. The applications for gas turbines within the biofuel production process are less obvious. There are large differences between the bio-syngas and natural gas in energy content and combustion properties which are technical problems when using high efficient modern gas turbines. This study therefore proposes the integration of a natural gas fired gas turbine; a hybrid plant. The heat from the fuel production and the heat recovery from the gas turbine flue gas are used in a joint steam cycle. Simulations of the hybrid cycle in methanol production have shown good improvements. The total electrical efficiency is increased by 1.4-2.4 percentage points, depending on the fuel mix. The electrical efficiency for the natural gas used in the hybrid plant is 56-58%, which is in the same range as in large-scale combined cycle plants. A bio-methanol plant with a hybrid power cycle is consequently a competitive production route for both biomass and natural gas}
place = {Sweden}
year = {2011}
month = {Jan}
}