Modified Two-Step Dimethyl Ether (DME) Synthesis Simulation from Indonesian Brown Coal

Dwiwahju Sasongko, Abdurrahman Fadhlil Halim Luthan, Winny Wulandari

Abstract


A theoretical study was conducted to investigate the performance of dimethyl ether (DME) synthesis from coal. This paper presents a model for two-step DME synthesis from brown coal represented by the following processes: drying, gasification, water-gas reaction, acid gas removal, and DME synthesis reactions. The results of the simulation suggest that a feedstock ratio of coal : oxygen : steam of 1 : 0.13 : 0.821 produces the highest DME concentration. The water-gas reactor simulation at a temperature of 400°C and a pressure of 20 bar gave the ratio of H2/CO closest to 2, the optimal value for two-step DME synthesis. As for the DME synthesis reactor simulation, high pressure and low temperature promote a high DME concentration. It is predicted that a temperature of 300°C and a pressure of 140 bar are the optimum conditions for the DME synthesis reaction. This study also showed that the DME concentration produced by the two-step route is higher than that produced by one-step DME synthesis, implying that further improvement and research are needed to apply two-step DME synthesis to production of this liquid fuel.

Full Text:

PDF

References


Soelistijo, U.W., Wibowo, A.P. & Abdullah, M., The Potential Share of Coal Liquefaction in The Indonesian Economy in 2025, Earth Science, 2(6), pp. 149-157, 2013.

Bhattacharya, S., Kabir, K.B. & Hein K., Dimethyl Ether Synthesis from Victorian Brown Coal Through Gasification – Current Status, and Research and Development Needs, Progress in Energy and Combustion Science, 39, pp. 577-605, 2013.

Hashimoto, T., Sakamoto, K., Yamaguchi, Y., Oura, K., Arima, K. & Suzuki, T. Overview of Integrated Coal Gasification Combined-cycle Technology Using Low-rank Coal, Mitsubishi Heavy Industries Technical Review, 48(3), 2011.

Kabir, K.B., Hein, K. & Bhattacharya, S., Process Modelling of Dimethyl Ether Production from Victorian Brown Coal – Integrating Coal Drying, Gasification and Synthesis Processes, Computers and Chemical Engineering, 48, pp. 96-104, 2013.

Khunaphan, S., Hartley, U.W. & Theinnoi, K., Characterization and Potential of Dimethyl Ether (DME) as Dual Fuel Combustion in a Compression Ignition Engine, International Journal of Engineering Science and Innovative Technology (IJESIT) 2(3) pp. 79-85, 2013.

Chen, H.S., Fan, C.W. & Yu, C.S., Analysis, Synthesis, and Design of a One-Step Dimethyl Ether Production Via a Thermodynamic Approach, Applied Energy, 101, 449-456, 2012.

Ohno, Y., Yagi, H., Inoue, N., Okuyama, K. & Aoki, S., Slurry Phase DME Direct Synthesis Technology-100 tons/day Demonstration Plant Operation and Scale up Study, A.B. Editor et.al (ed(s)), Elsevier B. V/ Ltd., pp. 1-12, 2005.

Voss, B., Joensen, F. & Hansen, J.B., Preparation of Fuel Grade dimethyl ether, US Patent, 5908963, 1999.

Babu, B.V., Process Plant Simulation, New Delhi: Oxford University Press, 2004.

Larson, E.D. & Tingjin, R., Synthetic Fuel Production by Indirect Coal Liquefaction, Energy for Sustainable Development, VII(4), pp. 79-102, 2003.

Bell, D.A., Towler, B.F. & Fan, M., Coal Gasification and Its Application, University of Oxford, United Kingdom, 2011.

National Energy Technology Laboratory, Gasification 2010 Worldwide Database, US Department of Energy, 2010.

Govind, R. & Shan, J., Modeling and Simulation of an Entrained Flow Coal Gasifier, American Institute of Chemical Engineers, 30(1), pp. 79-92, 1984.

Hoffman, Z., Simulation and Economic Evaluation of Coal Gasification with Sets Reforming Process for Power Production, Lousiana State University, United States of America, 2005.

Haugaard, J. & Voss, B., Process for the Synthesis of a Methanol/Dimethyl Ether Mixture from Synthesis Gas, US 6,191,175 B1. United States Patent, 2001.

Wen, C.Y. & Chaung, T.Z., Entrainment Coal Gasification Modeling, Industrial & Engineering Chemistry Process Design and Development, 18(4), pp. 684-695, 1979.

Speight, J.G., The Chemistry and Technology of Coal, 3rd edition, Taylor & Francis LLC, Florida, pp. 610, 2013.

Nikoo, M.B. & Mahinpey, N., Simulation of Biomass Gasification in Fluidized Bed Using ASPEN PLUS. Biomass and Bioenergy, 32(12), pp. 1245-1254, 2008.

Shim, H.M., Lee, S.J., Yoo, Y.D., Yun, Y.S. & Kim, H.T. Simulation of DME Synthesis from Coal Syngas by Kinetics Model, Korean Journal of Chemical Engineering, 26(3), pp. 641-648, 2009.




DOI: http://dx.doi.org/10.5614%2Fj.eng.technol.sci.2016.48.3.6

Refbacks

  • There are currently no refbacks.