Next Article in Journal
Is It Possible to Develop Electromobility in Urban Passenger Shipping in Post-Communist Countries? Evidence from Gdańsk, Poland
Next Article in Special Issue
Comparative Exergy Analysis of Units for the Porous Ammonium Nitrate Granulation
Previous Article in Journal
Evaluation of Hydrogen Yield Evolution in Gaseous Fraction and Biochar Structure Resulting from Walnut Shells Pyrolysis
Previous Article in Special Issue
Modelling Grid Constraints in a Multi-Energy Municipal Energy System Using Cumulative Exergy Consumption Minimisation
 
 
Comment published on 9 October 2021, see Energies 2021, 14(20), 6443.
Article

Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis

1
Department of Chemical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
2
Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Lahore 54000, Pakistan
*
Author to whom correspondence should be addressed.
Energies 2020, 13(23), 6361; https://doi.org/10.3390/en13236361
Received: 29 October 2020 / Revised: 21 November 2020 / Accepted: 27 November 2020 / Published: 2 December 2020
(This article belongs to the Special Issue Exergy Analysis and Optimization of Energy Systems and Processes)
Cryogenic air separation processes are widely used for the large-scale production of nitrogen and oxygen. The most widely used design for this process involves two distillation columns operating at different pressures. This work focuses on the selection of suitable cryogenic air separation process by evaluating seven alternative designs of the two-column air separation process based on detailed exergy analysis. The feed conditions (500 tons/h, and 50% relative humidity of air), product purities (99 mole% for both nitrogen and oxygen), and operational conditions (pressures of both distillation columns) are kept same in all designs. The two cryogenic distillation columns in each configuration are heat-integrated to eliminate the need for external utilities. Steady-state simulation results are used to calculate the exergy efficiency (%) of each equipment as well as its contribution toward the overall exergy destruction rate (kW) of the process. The results show that the compression section is a major source of exergy destruction, followed by the low-pressure column, and the multi-stream heat exchanger. A Petlyuk-like configuration, labeled as C1, provides the lowest exergy destruction rate. View Full-Text
Keywords: cryogenic distillation; air separation; exergy analyssis; exergy efficiency; exergy destruction; process simulation cryogenic distillation; air separation; exergy analyssis; exergy efficiency; exergy destruction; process simulation
Show Figures

Graphical abstract

MDPI and ACS Style

Hamayun, M.H.; Ramzan, N.; Hussain, M.; Faheem, M. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies 2020, 13, 6361. https://doi.org/10.3390/en13236361

AMA Style

Hamayun MH, Ramzan N, Hussain M, Faheem M. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies. 2020; 13(23):6361. https://doi.org/10.3390/en13236361

Chicago/Turabian Style

Hamayun, Muhammad Haris, Naveed Ramzan, Murid Hussain, and Muhammad Faheem. 2020. "Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis" Energies 13, no. 23: 6361. https://doi.org/10.3390/en13236361

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop