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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EVALUATION OF ENERGY CONSUMPTION IN A METHANOL PLANT
Submission Author:
Gabriel Princhak , BA , Brazil
Co-Authors:
Gabriel Princhak, Karen Pontes
Presenter: Gabriel Princhak
doi://10.26678/ABCM.ENCIT2020.CIT20-0474
Abstract
One important concern of the modern society is to mitigate the climate change effects caused by increasing CO2 emissions. A potential alternative is to convert recycled CO2 into methanol, since it can be used as fuel diminishing the dependency of fossil fuels. The present study evaluates the energy consumption to produce methanol from recycled CO¬2. The CO2 capture based on amine absorption and the CO2 hydrogenation to methanol are modeled in Aspen Hysys and Aspen Plus, respectively, due to the availability of suited thermodynamic models. The methanol production plant shows an efficient energy integration so that no steam is required. On the other hand, the CO2 capture plant still needs improvement to ensure the technical feasibility of the process. The total energy consumption of all compressors represents almost the total electricity demand of the plant (99.23%). The results show that the CO2 capture consumes about 90% of the total energy consumed by the capture and conversion processes. For the given operational conditions, it is not technically feasible to produce methanol to be used as fuel because the resulting energy balance is negative, i.e., more energy is spent to produce methanol than is available by the fuel itself. Therefore, further improvements in the capture process are required.
Keywords
mathematical modelling, CO2 mitigation, Methanol production, ENERGY INTEGRATION, CO2 capture
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