463187 Techno-Economic Analysis of Direct Coal-Biomass to Liquids (CBTL) Plants with Shale Gas Utilization and CO2 Capture and Storage (CCS)
In this study, the direct CBTL plants is designed based on the catalytic two-stage liquefaction process investigated by HTI, where inline hydrotreating is considered.1 Four different plant configurations, named SMR_CCS, SMR_VT, CG_CCS, CG_VT, are considered in this work based on different extent of CCS and H2 sources. In the SMR_CCS and SMR_VT processes, hydrogen is produced from shale gas steam methane reforming (SMR) and partial oxidation of liquefaction residue. In the CG_CCS and CG_VT processes, hydrogen is produced from co-gasification (CG) of coal/biomass/residue. High extent of CCS is considered in the SMR_CCS and CG_CCS processes, while all CO2 is vented (VT) in the SMR_VT and CG_VT processes. Both chemical and physical absorption processes are considered for carbon capture depending on the sources and partial pressure of CO2 in the CO2-containing stream. The process model and economic model are developed mainly in Aspen Plus® and Aspen Process Economic Analyzer® (APEA®), respectively, and are validated by comparing with the data obtained from the open literature.
In this presentation, we will focus on the following aspects: (1) development of plant-wide process model and rigorous economic model in Aspen Plus®, Aspen Exchanger Design and Rating®, APEA® and Excel, (2) sensitivity studies to analyze the impact of key design parameters (i.e. biomass/coal ratio, H2 sources, extent of CCS) and investment parameters (i.e. price of coal, biomass, shale gas, project life, plant contingency and plant capacity) on key economic measures, such as net present value (NPV), internal rate of return (IRR), break-even oil price (BEOP) and equivalent oil price (EOP), (3) analysis of the potential environmental credits due to use of biomass and CCS, (4) comparison between indirect and direct CBTL plants with or without CCS.
(1) Comolli, A.G., Lee, L.K., Pradhan, V.R., Stalzer, T.H., Harris, E.C., Mountainland, D.M., Karolkiewicz, W.F. and Pablacio, R.M., Direct Liquefaction Proof-of-Concept Facility, Technical Progress Report POC Run 01, Contract No. AC22-92PC92148, Hydrocarbon Research Inc., 1995.
See more of this Group/Topical: Sustainable Engineering Forum