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Energiintegrerat etanolkombinat baserat på lignocellulosa: Jämförelse mellan svagsyrahydrolys och enzymhydrolys
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
2011 (Swedish)Report (Refereed)
Abstract [sv]

Plants for bioethanol production have been planned in several cities in Sweden, including Borås. This report provides answers to general questions regarding how such a facility's energy demand is affected by the external integration with a heat and power plant and the internal energy integration between process units. Heat integration of a bioethanol plant means that energy is reused as much as is technically possible; this sets a practical minimum level for the energy demand of the plant. In the study, ethanol production from cellulose has been simulated using Aspen Plus. Weak acid hydrolysis and enzymatic hydrolysis have been simulated, each with 50,000 and 100,000 tonnes of ethanol per year, resulting in four simulation cases. In all cases, heat integration is evaluated using pinch analysis. The steam in the ethanol plant has been covered by steam from a heat and power plant similar to that found today in Borås. The reported energy quotas in this report includes energy use for upgrading the residual products. This leads to lower energy quotas than would be the case if the upgrading of residuals were allocated outside of the ethanol production. The conclusions from the project are: - The steam demand of the ethanol plant leads to a reduction in both the electricity and heat production of the heat and power plant. For the weak acid hydrolysis, the electricity loss is relatively high, 26–98%, which will affect the revenue significantly. The loss of electricity production is lower for the enzymatic process: 11–47%. - The difference in decreased electricity between the theoretical case of heating the raw material and the two alternative heating cases is about a factor of two, so the design of the heating of raw material is extremely important. - The reduced heat output of the power plant can, in most cases, be balanced by the surplus heat from the ethanol plant, but to completely balance the shortage, heat over 100°C must be used. - For a future polygeneration plant it is important to consider local conditions, such as the external integration capabilities and the raw materials available. - The choice of process greatly affects the need for raw materials since the yields differ. The lower yield of the weak acid process means that 60% more material is needed compared with the enzymatic process. - To ensure that the process also works in a real plant, research and validation of experiments are needed in full scale facilities. - Energy ratios for the reported cases show that ethanol production from cellulosic raw material ranges from 1.27 to 3.24 for the weak acid process, depending on the choice of process integration alternative, and between 3.51 to 9.56 for the enzymatic process.

Place, publisher, year, edition, pages
2011.
Series
SP Rapport, ISSN 0284-5172 ; 2011:07
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-4959Local ID: 11958ISBN: 978-91-86622-38-1 (print)OAI: oai:DiVA.org:ri-4959DiVA: diva2:962598
Available from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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