An exergy-based approach to determine production cost and CO2 allocation in refineries

In view of the continuous yet finite exergy supply to Earth, the determination exergy cost together with CO2 emission for fuel production is essential to the environmental evaluation of most processes. A petroleum refinery comprising atmospheric and vacuum distillation, delayed coking, fluidized catalytic cracking, hydrotreating, hydrogen generation, as well as residue/waste treatment units, such as sulphur recovery and sour water treatment, was analysed. Although high indexes of exergy conservation were observed for process units (>97%), the total exergy destroyed in the refinery was almost 800 MW. The calculation of the unit exergy cost and unit CO2 cost for produced fuels were performed by solving the set of linear equations used to describe the exergy cost formation for these fuels. The unit exergy costs found for diesel, gasoil, gasoline and hydrotreated diesel were 1.026 MJ/MJ, 1.028 MJ/MJ, 1.049 MJ/MJ and 1.10 MJ/MJ, respectively, while the unit CO2 costs for these fuels were 1.49gCO2/MJ, 1.20gCO2/MJ, 4.86gCO2/MJ, 6.34gCO2/MJ, respectively, reflecting the processing level and its efficiency as well as the C/H ratio of the burnt fuels.

[1]  Ricardo Rivero,et al.  The Exergy of Crude Oil Mixtures and Petroleum Fractions: Calculation and Application , 1999 .

[2]  S. Channiwala,et al.  A UNIFIED CORRELATION FOR ESTIMATING HHV OF SOLID, LIQUID AND GASEOUS FUELS , 2002 .

[3]  Ricardo Rivero,et al.  Exergy and exergoeconomic analysis of a crude oil combined distillation unit , 2004 .

[4]  Christos A. Frangopoulos,et al.  Thermo-economic functional analysis and optimization , 1987 .

[5]  Miguel A. Lozano,et al.  Theory of the exergetic cost , 1993 .

[6]  Luiz Felipe Pellegrini,et al.  Combined production of sugar, ethanol and electricity: Thermoeconomic and environmental analysis and , 2011 .

[7]  Ricardo Rivero.  Application of the exergy concept in the petroleum refining and petrochemical industry , 2002 .

[8]  S. Dinçer,et al.  Available energy analysis of a petroleum-refinery operation , 1986 .

[9]  R. Rivero,et al.  Simulation, exergy analysis and application of diabatic distillation to a tertiary amyl methyl ether production unit of a crude oil refinery , 2004 .

[10]  Alexandre Szklo,et al.  Fuel specification, energy consumption and CO2 emission in oil refineries , 2007 .

[11]  César Torres,et al.  On the cost formation process of the residues , 2008 .

[12]  Electo Eduardo Silva Lora,et al.  On the Negentropy Application in Thermoeconomics: A Fictitious or an Exergy Component Flow? , 2009 .

[13]  Haslenda Hashim,et al.  Optimal design of distillation column using three dimensional exergy analysis curves , 2010 .

[14]  Andrea Lazzaretto,et al.  SPECO: A systematic and general methodology for calculating efficiencies and costs in thermal systems , 2006 .

[15]  Tatiana Morosuk,et al.  Understanding the thermodynamic inefficiencies in combustion processes , 2013 .

[16]  M. Riazi.  Characterization and Properties of Petroleum Fractions , 2005 .

[17]  Roberto Schaeffer,et al.  The energy efficiency of crude oil refining in Brazil: A Brazilian refinery plant case , 2011 .

[18]  Antonio Valero,et al.  Structural theory as standard for thermoeconomics , 1999 .

[19]  A. I. Lygeros,et al.  Thermoeconomic operation optimization of the Hellenic Aspropyrgos Refinery combined-cycle cogeneration system , 1996 .

[20]  Jan Szargut,et al.  Exergy Analysis of Thermal, Chemical, and Metallurgical Processes , 1988 .

[21]  D. Cooper,et al.  Do you value steam correctly , 1989 .

[22]  Ibrahim Dincer,et al.  Thermodynamic analysis of crude oil distillation systems , 2005 .