An Experimental Study of Nonequilibrium Carbon Dioxide/Oil Interactions

Summary In this study, we use a custom-designed visual cell to investigate nonequilibrium carbon dioxide (CO2)/oil interactions under high-pressure/high-temperature conditions. We visualize the CO2/oil interface and measure the visual-cell pressure over time. We perform five sets of visualization tests. The first three tests aim at investigating interactions of gaseous (g), liquid (l), and supercritical (sc) CO2 with a Montney (MTN) oil sample. In the fourth test, to visualize the interactions in the bulk oil phase, we replace the opaque MTN oil with a translucent Duvernay (DUV) light oil (LO). Finally, we conduct an N2(sc)/oil test to compare the results with those of CO2(sc)/oil test. We also compare the results of nonequilibrium CO2/oil interactions with those obtained from conventional pressure/volume/temperature (PVT) tests. Results of the first three tests show that oil immediately expands upon injection of CO2 into the visual cell. CO2(sc) leads to the maximum oil expansion followed by CO2(l) and CO2(g). Furthermore, the rate of oil expansion in the CO2(sc)/oil test is higher than that in CO2(l)/oil and CO2(g)/oil tests. We also observe extracting and condensing flows at the CO2(l)/oil and CO2(sc)/oil interfaces. Moreover, we observe density-driven fingers inside the LO phase because of the local increase in the density of LO. The results of PVT tests show that the density of the CO2/oil mixture is higher than that of the CO2-free oil, explaining the density-driven natural convection during CO2(sc) injection into the visual cell. We do not observe either extracting/condensing flows or density-driven mixing for the N2(sc)/oil test, explaining the low expansion of oil in this test. The results suggest that the combination of density-driven natural convection and extracting/condensing flows enhances CO2(sc) dissolution into the oil phase, leading to fast oil expansion after CO2(sc) injection into the visual cell.

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Plasma Decomposition of Carbon Dioxide: Simulations and Experiments

Volume 6: Energy ◽

10.1115/imece2019-12059 ◽

2019 ◽

Author(s):

Kamau Wright ◽

Robert Galvez

Keyword(s):

Carbon Dioxide ◽

Co2 Concentration ◽

Plasma Discharges ◽

Electrical Parameters ◽

Plasma System ◽

Process Gas ◽

Plasma Decomposition ◽

Carbon Dioxide Co2 ◽

Co2 Decomposition ◽

Over Time

Abstract Simulations and experiments are conducted to model, simulate, test and demonstrate the effect of plasma discharges on decomposition of carbon dioxide (CO2). A pin-to-plane discharge is employed in gas samples containing CO2. A high voltage plasma system is used which was previously shown to be able to decrease CO2 concentration in gas samples. The discharge is modeled and described, including monitoring electrical parameters such as current and voltage. The present study investigated plasma decomposition of carbon dioxide experimentally, and through simulation. A plasma micro-discharge was utilized to better understand plasma-CO2 interactions. Enhancements are suggested to help increase the efficiency and yield of the plasma-CO2 decomposition process. Gas samples are analyzed over time using a CO2 meter.

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REVIEW ON CORBONDIOXIDE CURING OF CONCRETE

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2021.v05i10.026 ◽

2021 ◽

Vol 5 (10) ◽

Author(s):

Vijaya Kumar Y.M ◽

Seema B S

Keyword(s):

Mechanical Properties ◽

Carbon Dioxide ◽

Experimental Study ◽

Global Warming ◽

Compression Strength ◽

Industrial Activities ◽

Concrete Mix ◽

Water Curing ◽

Carbon Dioxide Co2 ◽

Stable Forms

Carbon dioxide (CO2) is the reason of increasing the global warming resulting from human industrial activities, to reduce these emissions of CO2 there is a necessity for sequestration of CO2 into stable forms. The paper summarizes the mechanical properties of concrete when cured on CO2 that is by using CO2 chamber. The research includes designing a concrete mix of M25 and M30 grade as per IS 10262:2009. The experimental study on water cured and CO2 specimens for compression strength were carried out. The results show that for M25 and M30 grade of concrete has achieved increasing value as comparing with 7days of water curing and the duration of 4hour CO2 curing. For M25 grade of concrete has achieved 70% of compression strength and M30 grade of concrete has achieved 65% of compression strength in the duration of 4hours of CO2 cured specimens when compared to 28days of water cured specimens.

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EVALUATION OF RTH IN REGIONAL SPATIAL PLAN WITH NDVI IN KENDARI CITY

Tunas Geografi ◽

10.24114/tgeo.v10i1.27472 ◽

2021 ◽

Vol 10 (1) ◽

pp. 53

Author(s):

Septianto Aldiansyah

Keyword(s):

Carbon Dioxide ◽

Urban Areas ◽

Minimum Standard ◽

Descriptive Research ◽

Current Availability ◽

Quantitative Descriptive ◽

Carbon Dioxide Co2 ◽

Over Time ◽

Spatial Plan

Kendari City is the capital of Southeast Sulawesi Province with a population of 345,110 people. The number of residents can trigger a narrowing of RTH (RTH) due to meeting the need for land over time. RTH in urban areas ideally is 30% of the total area with 20% public RTH and 10% private RTH. This study aims for RTH based on the comparison of the area of the RTH Regional Spatial Plan (RTRW) and the actual RTH, the population, the ability to produce oxygen (O2) and absorption of carbon dioxide (CO2) in the actual RTH. This research uses quantitative descriptive research in evaluating RTH. The results showed that public RTH in the RTRW still lacked 6.93% so that it was still necessary to review the RTRW to meet these needs. The current RTH is also still less than the minimum standard of RTH in Kendari City of 7.01% in public RTH. If it is accumulated, the current availability of RTH still does not meet the minimum standard of RTH in Kendari City. The availability of oxygen (O2) and absorption of carbon dioxide (CO2) in Kendari City can still meet the needs of residents in Kendari City.

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