Techno-economic study of CO2 capture from natural gas based hydrogen plants |
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| Institution: | 1. Department of Chemical Engineering, University of Waterloo, 200 University Ave. West, Waterloo, Ontario, Canada N2L 3G1;2. CANMET Energy Technology Centre, Natural Resources Canada, 1 Haanel Drive, Ontario, Canada K1A 1M1;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Key Laboratory of Gas Process Engineering, School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China;1. Dipartimento di Ingegneria, Università degli Studi del Sannio, Piazza Roma 21, 82100 Benevento, Italy;2. Combustion and CCS Centre, Cranfield University, Cranfield MK43 0AL, United Kingdom;3. Dipartimento di Scienze Chimiche, Università degli Studi di Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, 80126 Napoli, Italy;1. Energy Engineering Department, Sharif University of Technology, Tehran, Iran;2. International Research Institute of Stavanger (IRIS), Stavanger, Norway;3. Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran;1. Instituto de Carboquímica (Consejo Superior de Investigaciones Científicas), Miguel Luesma Castán 4, 50018 Zaragoza, Spain;2. Politecnico di Milano, Dipartimento di Energia, Via Lambruschini 4, 20156 Milano, Italy |
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| Abstract: | Canadian oil sands are considered to be the second largest oil reserves in the world. However, the upgrading of bitumen from oil sands to synthetic crude oil (SCO) requires nearly ten times more hydrogen (H2) than conventional crude oils. The current H2 demand for oil sands operations is met mostly by steam reforming of natural gas (SMR). The future expansion of oil sands operations is likely to quadruple the demand of H2 for oil sand operations in the next decade.This paper presents modified process schemes that capture CO2 at minimum energy penalty in modern SMR plants. The approach is to simulate a base case H2 plant without CO2 capture and then look for the best operating conditions that minimize the energy penalty associated with CO2 capture while maximizing H2 production. The two CO2 capture schemes evaluated in this study include a membrane separation process and the monoethanolamine (MEA) absorption process. A low energy penalty is observed when there is lower CO2 production and higher steam production. The process simulation results show that the H2 plant with CO2 capture has to be operated at lower steam to carbon ratio (S/C), higher inlet temperature of the SMR and lower inlet temperatures for the water gas-shift (WGS) converters to attain lowest energy penalty. Also it is observed that both CO2 capture processes, the membrane process and the MEA absorption process, are comparable in terms of energy penalty and CO2 avoided when both are operated at conditions where lowest energy penalty exists. |
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