Energetic, exergetic and economic assessment of oxygen production from two columns cryogenic air separation unit

Ebrahimi, Armin; Meratizaman, Mousa; Reyhani, Hamed Akbarpour; Pourali, Omid; Amidpour, Majid

doi:10.1016/j.energy.2015.06.083

Cited by 140 publications

(61 citation statements)

References 29 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The highest exergy destruction is reported for the preprocessing feed subsystem (air compressors, interstage cooler, and purification system), which amounts to 47 and 54% for the two-and three-column system, respectively. An air separation unit with an internal compression unit is analyzed from the energetic, exergetic, and economic points of view in [22]. The exergetic analysis shows that the air compression and distillation blocks have the highest exergy destruction.…”

Section: Componentmentioning

confidence: 99%

Comparative Evaluation of Cryogenic Air Separation Units from the Exergetic and Economic Points of View

Tesch¹,

Morosuk²,

Tsatsaronis³

2020

Low-Temperature Technologies

View full text Add to dashboard Cite

The industrial use of cryogenic air separation units started more than 120 years ago. Cryogenic air separation processes produce pure nitrogen, oxygen, and argon, as well as other noble gases. In cryogenic air separation units, the produced amounts of nitrogen and oxygen vary between 200 and 40,000 Nm 3 / h and 1000 and 150,000 Nm 3 / h , respectively. Different configurations of this process lead to various amounts of gaseous and liquid products. In addition, the purity of the products is affected by the schematic. Oxygen in gaseous or liquid form is typically used in the metallurgical (e.g., steel) industry, in chemical applications (as oxidizer), in power plants (for oxy-fuel combustion processes), as well as in the medical and aerospace sectors. Nitrogen in gaseous or liquid form is used as inert or flushing gas in the chemical industry and as a coolant for different applications. In this chapter, different schematics of air separation units are analyzed. An exergetic analysis is applied in order to identify the thermodynamic inefficiencies and the processes that cause them. Finally, the systems are evaluated from the economic point of view.

show abstract

Section: Componentmentioning

confidence: 99%

Comparative Evaluation of Cryogenic Air Separation Units from the Exergetic and Economic Points of View

Tesch¹,

Morosuk²,

Tsatsaronis³

2020

Low-Temperature Technologies

View full text Add to dashboard Cite

show abstract

“…Conventionally, there are two main approaches that can be used to separate a gas mixture. There are ultra-low-temperature cryogenic distillation and non-cryogenic approaches based on pressure swing adsorption (PSA) [ 5 , 6 , 7 ]. However, membrane-based technology has received increasing attention over the past decade as it offers several main advantages over conventional techniques, including lower energy consumption, process simplicity, reduced space requirements, being free of chemical usage, and scalability [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Multilayer Hybrid Coating on PSF Hollow Fiber Membrane for Enhanced Gas Separation

et al. 2020

View full text Add to dashboard Cite

One of the most critical issues encountered by polymeric membranes for the gas separation process is the trade-off effect between gas permeability and selectivity. The aim of this work is to develop a simple yet effective coating technique to modify the surface properties of commonly used polysulfone (PSF) hollow fiber membranes to address the trade-off effect for CO2/CH4 and O2/N2 separation. In this study, multilayer coated PSF hollow fibers were fabricated by incorporating a graphene oxide (GO) nanosheet into the selective coating layer made of polyether block amide (Pebax). In order to prevent the penetration of Pebax coating solution into the membrane substrate, a gutter layer of polydimethylsiloxane (PDMS) was formed between the substrate and Pebax layer. The impacts of GO loadings (0.0–1.0 wt%) on the Pebax layer properties and the membrane performances were then investigated. XPS data clearly showed the existence of GO in the membrane selective layer, and the higher the amount of GO incorporated the greater the sp2 hybridization state of carbon detected. In terms of coating layer morphology, increasing the GO amount only affected the membrane surface roughness without altering the entire coating layer thickness. Our findings indicated that the addition of 0.8 wt% GO into the Pebax coating layer could produce the best performing multilayer coated membrane, showing 56.1% and 20.9% enhancements in the CO2/CH4 and O2/N2 gas pair selectivities, respectively, in comparison to the membrane without GO incorporation. The improvement is due to the increased tortuous path in the selective layer, which created a higher resistance to the larger gas molecules (CH4 and N2) compared to the smaller gas molecules (CO2 and O2). The best performing membrane also demonstrated a lower degree of plasticization and a very stable performance over the entire 50-h operation, recording CO2/CH4 and O2/N2 gas pair selectivities of 52.57 (CO2 permeance: 28.08 GPU) and 8.05 (O2 permeance: 5.32 GPU), respectively.

show abstract

“…The following equations are utilized for updating the investment cost of the process equipment computed based on the given relations in the literature (Table 9). 34,43

{Cost}_{reference year} = {Cost}_{original year} \frac{Cost {index}_{reference cost year}}{Cost {index}_{original cost year}},

\begin{matrix} lefttrue \\ ACS = C_{acap} (components) + C_{arep} (components) + C_{amain} (components) + C_{aope} (labor cost + fuel cost + insurance cost) . \end{matrix}

…”

Section: Economic Analysismentioning

confidence: 99%

Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

et al. 2020

View full text Add to dashboard Cite

Summary Conceptual design and modeling of novel‐integrated process configurations for helium extraction and natural gas liquefaction is investigated. Mixed fluid cascade (MFC) refrigeration system is considered for providing the needed refrigeration in the natural liquefaction section. Using an absorption refrigeration system as the precooling cycle is investigated in one of the introduced processes. Integrated flash and distillation method is used for helium extraction. Purity of the extracted crude helium is 50% (mole). Process streams operational condition and specifications of the devices are presented and explained. Composite curves of the heat exchangers demonstrate that thermal design has been done properly. Ratio of the power consumption to the produced liquefied natural gas (LNG) of the MFC process is 0.265 kWh per kg LNG and applying absorption refrigeration system instead of the pre‐cooling cycle decreases it to 0.1849 kWh per kg LNG. For the modified process with absorption refrigeration system helium extraction rate and power consumption ratio are 0.951 and 132.9 (kWh/[kgmole Helium]) respectively. Exergy method is applied on the under consideration processes. The results show that the compressors have the highest rate of exergy destruction among the other process equipment. An extensive economic analysis is done on the proposed processes. The results show that prime cost of the product (US$/kg LNG) for MFC and modified MFC processes are 0.1939 and 0.2069, respectively. Finally, a sensitivity analysis is done based on the economic factors such as electrical energy price and prime cost of the product.

show abstract

Energetic, exergetic and economic assessment of oxygen production from two columns cryogenic air separation unit

Cited by 140 publications

References 29 publications

Comparative Evaluation of Cryogenic Air Separation Units from the Exergetic and Economic Points of View

Comparative Evaluation of Cryogenic Air Separation Units from the Exergetic and Economic Points of View

Impacts of Multilayer Hybrid Coating on PSF Hollow Fiber Membrane for Enhanced Gas Separation

Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

Contact Info

Product

Resources

About