scholarly journals Comment on Hamayun et al. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies 2020, 13, 6361

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6443 ◽  
Author(s):  
Miroslav Variny ◽  
Dominika Jediná ◽  
Patrik Furda
Keyword(s):  
Exergy Analysis ◽  
Scientific Literature ◽  
Aspen Plus ◽  
Simulation Software ◽  
Air Separation ◽  
Oxygen Production ◽  
Separation Processes ◽  
Aspen Hysys ◽  
Energy Consumption Optimization ◽  
Selection Of

Oxygen production from air belongs to energy-intense processes and, as a result, possibilities for its decrease are a frequent topic of optimization studies, often performed with simulation software such as Aspen Plus or Aspen HYSYS. To obtain veritable results and sound solutions, a suitable calculation method hand in hand with justified assumptions and simplifications should form the base of any such studies. Thus, an analysis of the study by Hamayun et al., Energies 2020, 13, 6361, has been performed, and several weak spots of the study, including oversimplified assumptions, improper selection of a thermodynamic package for simulation and omission of certain technological aspects relevant for energy consumption optimization studies, were identified. For each of the weak spots, a recommendation based on good praxis and relevant scientific literature is provided, and general recommendations are formulated with the hope that this comment will aid all researchers utilizing Aspen Plus and Aspen HYSYS software in their work.

scholarly journals Reply to Variny et al. Comment on “Hamayun et al. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies 2020, 13, 6361”

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6445
Author(s):  
Muhammad Haris Hamayun ◽  
Naveed Ramzan ◽  
Murid Hussain ◽  
Muhammad Faheem
Keyword(s):  
Exergy Analysis ◽  
Air Separation ◽  
Separation Processes

This is a reply to the paper by Variny et al. [...]

Exergy analysis of two cryogenic air separation processes

Energy ◽  
2010 ◽  
Vol 35 (12) ◽  
pp. 4731-4739 ◽  
Author(s):  
L.V. van der Ham ◽  
S. Kjelstrup
Keyword(s):  
Exergy Analysis ◽  
Air Separation ◽  
Separation Processes

Gas Turbine Applications for Large Air Separation Units

1999 ◽  
Author(s):  
A. R. Smith ◽  
J. L. Dillon
Keyword(s):  
Gas Turbines ◽  
Economies Of Scale ◽  
Cost Effective ◽  
Alternative Fuel ◽  
Combined Cycle ◽  
Air Separation ◽  
Oxygen Production ◽  
Integrated Gasification Combined Cycle ◽  
Separation Processes ◽  
Oxygen Requirements

Oxygen production rates of 10,000 to 20,000 tons per day from large, cryogenic air separation units are being studied by many alternative fuel project developers. These projects utilize oxygen to partially oxidize hydrocarbon materials, producing a clean synthesis gas that can be used as a fuel or for conversion into valuable chemical products. Specific market applications include natural gas or waste material conversion processes and multi-train integrated gasification combined cycle facilities. In an effort to reduce specific facility cost project developers increase facility output to obtain economies of scale, resulting in large oxygen requirements for the partial oxidation step. One of the challenges to provide cost effective oxygen is the economic supply of large quantities of compressed air for use in the cryogenic air separation process. To date, gas turbines have found limited application for use in air separation facilities due to their relatively high capital cost compared to traditional electric motor drives. The need for large, single train air separation units to support alternative fuel projects creates opportunities for the use of gas turbines. This paper explores the use of commercially available equipment, configured to integrate with air separation processes, to improve the economics of oxygen production. Long term developmental equipment configurations are presented to further improve the economics of these facilities.

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

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6361
Author(s):  
Muhammad Haris Hamayun ◽  
Naveed Ramzan ◽  
Murid Hussain ◽  
Muhammad Faheem
Keyword(s):  
Large Scale ◽  
Exergy Analysis ◽  
Separation Process ◽  
Air Separation ◽  
Scale Production ◽  
Exergy Destruction ◽  
Separation Processes ◽  
Distillation Columns ◽  
Operational Conditions ◽  
Destruction Rate

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.

scholarly journals Exergy Analysis of Liquid Nitrogen Power Cycles

2019 ◽  
Vol 201 ◽  
pp. 01004
Author(s):  
Paweł Wojcieszak
Keyword(s):  
Liquid Nitrogen ◽  
Energy Demand ◽  
Power Plants ◽  
Exergy Analysis ◽  
Renewable Energy Sources ◽  
Air Separation ◽  
Direct Expansion ◽  
Separation Processes ◽  
Separation Unit ◽  
Electrical Grid

Nitrogen is by-product from cryogenic air separation processes used for oxygen production for metallurgy and oxygen-enriched combustion purposes. If the gases are delivered from air separation unit (ASU) in liquid phase, liquid nitrogen (LN2) can be used as energy accumulator for stabilization of electrical grid system with large share of renewable energy sources. When the energy demand is high and not enough electricity is generated in power plants, energy accumulated in LN2 may be recovered in a cryogenic power cycle. In this research complete exergy analysis of liquid nitrogen direct expansion cycle and combined direct expansion/Brayton cycle was performed.

The Research Project «Names of Modern Professions» in Extracurricular Work with 6-th Grade Russian Students

2020 ◽  
Vol 81 (6) ◽  
pp. 23-31
Author(s):  
M. I. Vasileva
Keyword(s):  
Theoretical Analysis ◽  
Scientific Literature ◽  
Research Process ◽  
Russian Language ◽  
Research Project ◽  
Educational Activities ◽  
Research Activities ◽  
The Russian Language ◽  
Selection Of

The aim of the study was to investigate approaches to the formation of general educational skills. A survey examining the design and research process was carried out by 6th-grade Russian students over the course of an extracurricular project entitled «Names of Modern Professions». In the paper, the selection of the «Lexicology» section for such activities carried out by school pupils is substantiated and stages of work on the project are described. The applied methodology involves theoretical analysis of scientific literature, formative experimentation, analysis of products of educational activities, observation and description. It is concluded that the design of extracurricular research activities in the Russian language contributes to the formation of general educational competencies in conducting surveys and searching for information on the basis of subject skills.

ASU Simulation in Separating Air Components by Refrigeration Distillation (Oxygen and Nitrogen) Using ASPEN HYSYS (Case Study: SIAD Company)

2020 ◽  
Vol 15 (3) ◽  
Author(s):  
Afshar Alihosseini
Keyword(s):  
Cooling Capacity ◽  
Air Separation ◽  
Cooling Power ◽  
Distillation Tower ◽  
Aspen Hysys ◽  
Expansion Turbine ◽  
Gas Products ◽  
Utility Services ◽  
Petrochemical Industries

AbstractCurrently, air separation units (ASUs) have become very important in various industries, particularly oil and petrochemical industries which provide feed and utility services (oxygen, nitrogen, etc.). In this study, a new industrial ASU was evaluated by collecting operational and process information needed by the simulator by means of HYSYS software (ASPEN-ONE). The results obtained from this simulator were analyzed by ASU data and its error rate was calculated. In this research, the simulation of ASU performance was done in the presence of an expansion turbine in order to provide pressure inside the air distillation tower. Likewise, the cooling capacity of the cooling compartment and the data were analysed. The results indicated that expansion turbine is costly effective. Notably, it not only reduces the energy needed to compress air and supply power of the equipment, but also provides more cooling power and reduces air temperature. Moreover, turbines also increase the concentration of lighter gas products, namely nitrogen.

Exergy analysis of cryogenic air separation

1998 ◽  
Vol 39 (16-18) ◽  
pp. 1821-1826 ◽  
Author(s):  
R.L. Cornelissen ◽  
G.G. Hirs
Keyword(s):  
Exergy Analysis ◽  
Air Separation

scholarly journals Simulation and optimization integrated gasification combined cycle by used aspen hysys and aspen plus

2015 ◽  
Vol 3 (1) ◽  
pp. 178
Author(s):  
Mohsen Darabi ◽  
Mohammad Mohammadiun ◽  
Hamid Mohammadiun ◽  
Saeed Mortazavi ◽  
Mostafa Montazeri
Keyword(s):  
Gas Turbine ◽  
Coal Gasification ◽  
Aspen Plus ◽  
Combined Cycle ◽  
Parameters Estimation ◽  
Integrated Gasification Combined Cycle ◽  
Support Tool ◽  
Simulation And Optimization ◽  
Aspen Hysys ◽  
Integrated Gasification

<p>Electricity is an indispensable amenity in present society. Among all those energy resources, coal is readily available all over the world and has risen only moderately in price compared with other fuel sources. As a result, coal-fired power plant remains to be a fundamental element of the world's energy supply. IGCC, abbreviation of Integrated Gasification Combined Cycle, is one of the primary designs for the power-generation market from coal-gasification. This work presents a in the proposed process, diluted hydrogen is combusted in a gas turbine. Heat integration is central to the design. Thus far, the SGR process and the HGD unit are not commercially available. To establish a benchmark. Some thermodynamic inefficiencies were found to shift from the gas turbine to the steam cycle and redox system, while the net efficiency remained almost the same. A process simulation was undertaken, using Aspen Plus and the engineering equation solver (EES).The The model has been developed using Aspen Hysys® and Aspen Plus®. Parts of it have been developed in Matlab, which is mainly used for artificial neural network (ANN) training and parameters estimation. Predicted results of clean gas composition and generated power present a good agreement with industrial data. This study is aimed at obtaining a support tool for optimal solutions assessment of different gasification plant configurations, under different input data sets.</p>

Exergy Analysis of a Novel Cryogenic Concept for the Liquefaction of Natural Gas Integrated Into an Air Separation Process

2016 ◽  
Author(s):  
S. Tesch ◽  
T. Morosuk ◽  
G. Tsatsaronis
Keyword(s):  
Natural Gas ◽  
Power Consumption ◽  
Exergy Analysis ◽  
Primary Energy ◽  
Separation Process ◽  
Air Separation ◽  
Total Power ◽  
Separation Unit ◽  
Total Power Consumption ◽  
Liquefaction Temperature

The increasing demand for primary energy leads to a growing market of natural gas and the associated market for liquefied natural gas (LNG) increases, too. The liquefaction of natural gas is an energy- and cost-intensive process. After exploration, natural gas, is pretreated and cooled to the liquefaction temperature of around −160°C. In this paper, a novel concept for the integration of the liquefaction of natural gas into an air separation process is introduced. The system is evaluated from the energetic and exergetic points of view. Additionally, an advanced exergy analysis is conducted. The analysis of the concepts shows the effect of important parameters regarding the maximum amount of liquefiable of natural gas and the total power consumption. Comparing the different cases, the amount of LNG production could be increased by two thirds, while the power consumption is doubled. The results of the exergy analysis show, that the introduction of the liquefaction of natural gas has a positive effect on the exergetic efficiency of a convetional air separation unit, which increases from 38% to 49%.

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