A proposed coal-to-methanol process with CO2 capture combined Organic Rankine Cycle (ORC) for waste heat recovery

Abstract Coal-to-methanol (CTM) is the main methanol production process in China. Application of carbon capture and storage (CCS) technology in CTM is a possible way for CO 2 reduction. However, the increase of energy consumption caused by CCS and related increase of Green House Gas footprint has to be minimised. This paper presents a CTM combined with CO 2 capture and Organic Rankine Cycle (ORC) power generation, which improves energy efficiency simultaneously. The electricity generated from ORC is through the thermodynamic cycle converted the waste heat recovered from the CO 2 compression and water gas shift unit in CTM process. The proposed process is simulated and analysed from energy efficiency and economic viewpoints. The analysis indicates several points: (1) Heat Integration of CO 2 compression and water gas shift unit produce the heated water as the heat source of ORC; (2) With the CO 2 ratio of 60%, the energy efficiency of the proposed CTM combined ORC system is 45.5%; (3) From economic point of view, electricity generated from waste heat conversion is around 4.8 MW, and the payback period of the ORC invested in CTM with CO 2 capture process is 2.7 y.

[1]  Amit Kumar,et al.  Techno-economic assessment of hydrogen production from underground coal gasification (UCG) in Western Canada with carbon capture and sequestration (CCS) for upgrading bitumen from oil sands , 2013 .

[2]  George Papadakis,et al.  Heat resources and organic Rankine cycle machines , 2014 .

[3]  Farid Chejne,et al.  A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation , 2012 .

[4]  George Papadakis,et al.  Low­grade heat conversion into power using organic Rankine cycles - A review of various applications , 2011 .

[5]  W. Gu,et al.  Theoretical and experimental investigation of an organic Rankine cycle for a waste heat recovery system , 2009 .

[6]  M. O. Garg,et al.  Syngas production through gasification and cleanup for downstream applications Recent developments , 2011 .

[7]  C. Cormos.  Hydrogen and power co-generation based on coal and biomass/solid wastes co-gasification with carbon capture and storage , 2012 .

[8]  Y. Man,et al.  Techno-economic analysis of the coal-to-olefins process in comparison with the oil-to-olefins process , 2014 .

[9]  Martin Kumar Patel,et al.  Basic petrochemicals from natural gas, coal and biomass: energy use and CO2 emissions , 2009 .

[10]  Jin-Kuk Kim,et al.  Integrated design and optimization of technologies for utilizing low grade heat in process industries , 2014 .

[11]  Borja Arias,et al.  Analysis of a double calcium loop process configuration for CO2 capture in cement plants , 2016 .

[12]  Lu Yang,et al.  The controversial fuel methanol strategy in China and its evaluation , 2014 .

[13]  Peng Pei,et al.  Waste heat recovery in CO2 compression , 2014 .

[14]  Patrick Linke,et al.  Toward Optimum Working Fluid Mixtures for Organic Rankine Cycles using Molecular Design and Sensitivity Analysis , 2013 .

[15]  Yu Qian,et al.  Environmental impact and techno-economic analysis of the coal gasification process with/without CO2 capture , 2014 .

[16]  Michele Pinelli,et al.  Integration between a thermophotovoltaic generator and an Organic Rankine Cycle , 2012 .

[17]  Tao Guo,et al.  Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geother , 2011 .

[18]  Viktor Scherer,et al.  Economic evaluation of pre-combustion CO2-capture in IGCC power plants by porous ceramic membranes , 2014 .

[19]  François Maréchal,et al.  Review, modeling, Heat Integration, and improved schemes of Rectisol®-based processes for CO2 capture , 2014 .

[20]  Yourun Li,et al.  Study on co-feed and co-production system based on coal and natural gas for producing DME and electricity , 2008 .

[21]  Patrick Linke,et al.  Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review , 2015 .

[22]  Judith Gurney.  BP Statistical Review of World Energy , 1985 .

[23]  Yu Qian,et al.  Simulation and assessment of an integrated acid gas removal process with higher CO2 capture rate , 2015, Comput. Chem. Eng..

[24]  Qingchun Yang,et al.  An Integrated Framework for Modeling, Synthesis, Analysis, and Optimization of Coal Gasification-Based Energy and Chemical Processes , 2012 .

[25]  Steven Lecompte,et al.  Review of organic Rankine cycle (ORC) architectures for waste heat recovery , 2015 .

[26]  Chun-Mei Wu,et al.  Economical evaluation and optimization of subcritical organic Rankine cycle based on temperature matching analysis , 2014 .

[27]  Chun-wei Gu,et al.  Parametric design and off-design analysis of organic Rankine cycle (ORC) system , 2016 .

[28]  Haslenda Hashim,et al.  Modelling and optimization of CO2 abatement strategies , 2014 .

[29]  Patrick Linke,et al.  On the systematic design and selection of optimal working fluids for Organic Rankine Cycles , 2010 .

[30]  Jiří Jaromír Klemeš,et al.  A Review of Footprint analysis tools for monitoring impacts on sustainability , 2012 .

[31]  Pedro J. Mago,et al.  An examination of regenerative organic Rankine cycles using dry fluids , 2008 .

[32]  Vincent Lemort,et al.  Techno-economic survey of Organic Rankine Cycle (ORC) systems , 2013 .

[33]  Li Zhou,et al.  Simulation and Economic Analysis of Indirect Coal-to-Liquid Technology Coupling Carbon Capture and Storage , 2013 .

[34]  Naijun Zhou,et al.  Fluid selection and parametric optimization of organic Rankine cycle using low temperature waste heat , 2012 .

[35]  Juan Carlos Abanades,et al.  Integrated combined cycle from natural gas with CO2 capture using a Ca–Cu chemical loop , 2013 .

[36]  Sharifah Rafidah Wan Alwi,et al.  Process Integration and Intensification: Saving Energy, Water and Resources , 2014 .

[37]  Jiří Jaromír Klemeš,et al.  Forty years of Heat Integration: Pinch Analysis (PA) and Mathematical Programming (MP) , 2013 .

[38]  Tomasz Chmielniak,et al.  Cost Estimates of Coal Gasification for Chemicals and Motor Fuels , 2012 .

[39]  Vincent Lemort,et al.  Systematic optimization of subcritical and transcritical organic Rankine cycles (ORCs) constrained by technical parameters in multiple applications , 2014 .

[40]  Stephen A. Rackley,et al.  Carbon Capture and Storage , 2009 .

[41]  Yan Li,et al.  Thermodynamic analysis and performance optimization of an ORC (Organic Rankine Cycle) system for multi-strand waste heat sources in petroleum refining industry , 2014 .

[42]  J. Klemeš.  Assessing and measuring environmental impact and sustainability , 2015, Clean Technologies and Environmental Policy.