scholarly journals Precipitation of Minerals from Water-Rich Fumarolic Gas Using a Flow-through Benchtop Installation

2022 ◽  
Author(s):  
Michael Zelenski ◽  
Yuri Taran ◽  
Alina Korneeva ◽  
Fedor Sandalov ◽  
Nikolai Nekrylov
Keyword(s):  
Glass Tube ◽  
Ideal Gas ◽  
Laboratory Model ◽  
Temperature Dependent ◽  
Metal Compounds ◽  
Factors Affecting ◽  
Fumarolic Gases ◽  
Inert Carrier ◽  
Flow Through ◽  
Main Components

Volcanic fumaroles are openings in the earth's surface, where volcanic gases discharge to the atmosphere. Metallic and non-metallic elements contained in gases form specific mineral precipitates upon cooling. Although the presence of metals in fumarolic gases has long been known, their concentrations are generally low and difficult to measure directly. A laboratory model of a fumarole may resolve the situation if the complex gas composition could be accurately reproduced. Here we describe a new experimental approach that allows accurately simulating fumarolic gases in terms of their main components (H2O, CO2, S, HCl), as well as adding volatile metal compounds. Gas is generated inside a special flow-through reactor, at the outlet of which the elements contained in the gas form temperature-dependent mineral sequence inside the attached silica-glass tube. Using this installation, we obtained laboratory sublimates from reducing (H2S-rich) gases similar to natural ones in terms of mineral composition and mineral habits. Twenty-one phases have been identified in sublimates, among which are simple and complex chlorides, simple sulfides and six sulfosalts. Comparison of the sublimate deposition from H2O-rich gas at 1 bar with similar works performed in evacuated ampoules at low pressure showed that fumarolic gases behave like an ideal gas, in which molecules do not interact with each other, and reactive compounds in the gas serve in fact as an inert carrier of volatile metals species. Changing the composition of the gas at the outlet of the installation, its flow rate and temperature, we can observe the corresponding changes in mineral precipitates and in such a way study the factors affecting mineral formation on natural fumarolic fields.

scholarly journals Experimental study on adsorbing of flue gas and its application in preventing spontaneous combustion of coal

2018 ◽  
Vol 36 (9-10) ◽  
pp. 1744-1754 ◽  
Author(s):  
Fei Gao ◽  
Cun-Bao Deng ◽  
Xue-Feng Wang ◽  
Xue-Ming Li ◽  
Feng-Wei Dai
Keyword(s):  
Power Plant ◽  
Adsorption Capacity ◽  
Flue Gas ◽  
Spontaneous Combustion ◽  
Factors Affecting ◽  
Generation Cost ◽  
Spontaneous Combustion Of Coal ◽  
Temperature And Pressure ◽  
Main Components ◽  
Emission Of Greenhouse Gases

We propose an experimental adsorption device, imitating the environment of a coal-mine goaf and the composition of the flue gas in Tashan Mine Power Plant. The characteristics of the coal adsorbing flue gas were studied with the atmospheric volumetric method. The factors affecting the seal of CO2 were analyzed and the effect of power plant flue gas on fire prevention in the goaf was investigated at normal temperature and pressure. It can be inferred from the experiment that N2, SO2, and H2O can also reduce CO2 adsorption capacity. The increase or decrease in pH can increase the adsorption capacity of CO2, which is apparently larger when the pH is decreasing than when the pH is increasing. The O2 adsorption capacity can evidently be reduced when the power plant flue gas is injected into the goaf. The activation energy of coal burned in air is greater than that of coal burned in flue gas, indicating that the use of power plant flue gas, with N2 and CO2 as the main components, to replace the traditional inert gas can not only save N2 generation cost, but also reduce the emission of greenhouse gases, while the power plant flue gas can be adsorbed by coal.

scholarly journals Does E-Money Affect Inflation In Indonesia

2021 ◽  
Vol 19 (1) ◽  
pp. 1
Author(s):  
Andres Dharma Nurhalim
Keyword(s):  
Exchange Rate ◽  
Interest Rate ◽  
Exchange Rates ◽  
Money Supply ◽  
Quantitative Approach ◽  
Electronic Money ◽  
Factors Affecting ◽  
Main Factors ◽  
The Interest Rate ◽  
Main Components

The purpose of this study aims to explain the effect of electronic money on inflation and how much influence it has on the Indonesian economy. In this study the authors used a quantitative approach. The variables used are inflation, electronic money, exchange rate, money supply (M1), and BI interest rate. Result: The previous money supply (LQMprev) and the interest rate (BI Rate) were the main factors affecting inflation. In this result, e-money and exchange rates are not the main components driving inflation. Based on SPPS processing using regression, e-money and exchange rates do not have a significant effect on inflation in Indonesia, but LQMprev has a significant effect on inflation. From the results of this study it is still too early to analyze the effect of e-money on inflation because it is still relatively new in Indonesia.

scholarly journals Luminosity variation in the extended one-zone RR Lyrae model

2005 ◽  
pp. 57-64
Author(s):  
D. Pricopi
Keyword(s):  
Ideal Gas ◽  
Stellar Model ◽  
Nonlinear Analyses ◽  
Uniform Rotation ◽  
Factors Affecting ◽  
Pulsating Stars ◽  
Rr Lyrae ◽  
Stellar Pulsation ◽  
Pulsation Model ◽  
Good Agreement

The Stellingwerf one-zone stellar model is extended by assuming, a slow and uniform rotation that leads to a very small oblateness of the star. The matter in the core-surrounding shell is supposed to consists of a mixture of ideal gas and radiation. This one-zone stellar pulsation model is proposed as a tool to investigate the factors affecting luminosity variations of pulsating stars. Linear and nonlinear analyses of the resulting equations are described. The results are in very good agreement with the observed RR Lyrae light curves. .

The reproductive biology and ecology of Gammarus duebeni (Crustacea: Amphipoda) in southern England

1983 ◽  
Vol 63 (3) ◽  
pp. 517-540 ◽  
Author(s):  
Martin Sheader
Keyword(s):  
Life Cycle ◽  
Egg Production ◽  
Breeding Strategy ◽  
Female Size ◽  
Temperature Dependent ◽  
Southern Limit ◽  
Factors Affecting ◽  
North East ◽  
The North ◽  
Test Estuary

A study was made of the life cycle and reproductive ecology of Gammarus duebeni in the Test Estuary on the south coast of England. The species is towards the southern limit of its distributional range in the north-east Atlantic, which results in breeding continuing throughout much of the year. The breeding strategy employed was found to vary with season. The size of eggs produced and the rate of egg production were both temperature dependent, whereas the proportion of production expended on eggs and the number of eggs per brood, although probably influenced by temperature appeared to be controlled by food availability and female size. Factors affecting the mortality of eggs within the marsupium and breeding synchrony were considered in relation to season. The life cycle consisted of two major overlapping generations.

scholarly journals Gas flow through a bore-piston ring contact

2020 ◽  
pp. 146808742097112
Author(s):  
Baptiste Hallouin ◽  
Didier Lasseux ◽  
Gerald Senger
Keyword(s):  
Gas Flow ◽  
Piston Ring ◽  
Practical Interest ◽  
Contact Length ◽  
Ideal Gas ◽  
Ideal Gas Law ◽  
Thermodynamic Conditions ◽  
Sinusoidal Shape ◽  
Flow Through ◽  
Ic Engines

This work reports on the derivation of simplified but accurate models to describe gas flow through a bore-piston ring contact in reciprocating machines like compressors or IC engines. On the basis of the aperture field of a contact deduced from real measurements carried out on an expanding ring in a bore, a scale analysis on the complete compressible flow model is performed, assuming ideal gas law. It is shown that the flow can be treated as stationary and three distinct flow regimes can be identified (namely incompressible, compressible creeping, and compressible inertial regimes). Three dimensionless parameters characterizing these regimes are identified. While for the two former regimes, classical analytical Poiseuille type of models are derived, an Oseen approximation is further employed for the latter, yielding a quasi-analytical solution. The models are successfully compared to direct numerical simulations (DNS) of the complete initial set of balance equations in their steady form performed on an aperture field of sinusoidal shape. These simplified models are of particular practical interest since they allow an accurate gas flow-rate estimate through a real contact using the aperture field as the geometrical input datum, together with the thermodynamic conditions (pressure and temperature). This represents an enormous advantage as DNS is still very challenging in practice due to the extremely small value of the contact aperture to contact length ratio.

scholarly journals Heavy Oil Laminar Flow in Corrugated Ducts: A Numerical Study Using the Galerkin-Based Integral Method

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1363
Author(s):  
Valdecir Alves dos Santos Júnior ◽  
Severino Rodrigues de Farias Neto ◽  
Antonio Gilson Barbosa de Lima ◽  
Igor Fernandes Gomes ◽  
Israel Buriti Galvão ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Reynolds Number ◽  
Laminar Flow ◽  
Heavy Oil ◽  
Integral Method ◽  
Numerical Study ◽  
Temperature Dependent ◽  
Flow Through ◽  
Fanning Friction Factor ◽  
Cylindrical Duct

Fluid flow in pipes plays an important role in different areas of academia and industry. Due to the importance of this kind of flow, several studies have involved circular cylindrical pipes. This paper aims to study fully developed internal laminar flow through a corrugated cylindrical duct, using the Galerkin-based integral method. As an application, we present a study using heavy oil with a relative density of 0.9648 (14.6 °API) and temperature-dependent viscosities ranging from 1715 to 13000 cP. Results for different fluid dynamics parameters, such as the Fanning friction factor, Reynolds number, shear stress, and pressure gradient, are presented and analyzed based on the corrugation number established for each section and aspect ratio of the pipe.

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