Researches of Aggressive Gas Flow Cleaning from Wood Ash Particu-late Matter in the Multi-Channel Cyclone

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.013 ◽

2017 ◽

Author(s):

Aleksandras Chlebnikovas ◽

Pranas Baltrėnas

Keyword(s):

Flow Velocity ◽

Gas Flow ◽

Aerodynamic Resistance ◽

Experimental Tests ◽

Wood Ash ◽

Cleaning Efficiency ◽

Gas Cleaning ◽

Place Studies ◽

Aerodynamic Parameters ◽

Gas Flow Velocity

The studies examined the gas flow aerodynamic parameters and treatment efficiency from the wood ash particulate matter, also an adhesion dependencies in multi-channel cyclone using aggressive gas flow – temperature up to 75 °C and relative humidity more than 95%. Researches of gas flow velocity and cyclone aerodynamic resistance in case of different average gas flow velocity in the cyclone and particle adhesion analysis inside the cyclone. Cyclones work is based on centrifugal forces and additionally resulting filtration process operation. Due to the interaction between inlet flow from the (peripheral) channel coming next and the flow following the direction towards the axis of the cyclone along the channel (transit), additional filtration takes place. Studies was carried out the prototype of multi-channel cy-clone, which is used with curvilinear quarter-rings with opening slot folded at an angle, so that the peripheral and transit flows are equal to each other. The aim – to determine the multi-channel cyclone aerodynamic parameters, and their dependencies, to make aggressive gas flow and to analyse the wood ash particles adhesion and its impact to multi-channel cyclone operation by occluding device's internal design. The average velocity of gas flow was equal to 8, 12 and 16 m/s, the highest aerodynamic resistance was equal to 410 Pa, which was determined in the case at 16 m/s. Based on experimental tests, PM which the diameter up to 20 microns, the gas cleaning efficiency is above 85% when inlet concentration was 5 g/m3.

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Research of the Aerodynamic Parameters in a Special Cyclone with Secondary Inlets

Mokslas - Lietuvos ateitis ◽

10.3846/mla.2017.1065 ◽

2017 ◽

Vol 9 (4) ◽

pp. 400-405

Author(s):

Aleksandras Chlebnikovas ◽

Pranas Baltrėnas

Keyword(s):

Particulate Matter ◽

Gas Flow ◽

Fine Particulate Matter ◽

Centrifugal Forces ◽

Cleaning Efficiency ◽

Gas Treatment ◽

Fine Particulate ◽

Process Operation ◽

Aerodynamic Parameters ◽

Gas Flow Velocity

Special cyclone – gas treatment device which can be applied to remove the fine particulate matter bigger than 2 micrometres from aggressive gas flow at a temperature of 50–145 °C and a relative humidity of more than 95% and can be achieved the cleaning efficiency over 90%. Cyclone work is based on centrifugal forces and the resulting additional filtration process operation. Cyclone structure equipped with primary and secondary gas flow inflows through which gas dispersed flow is supplied parallel to all channels of the cyclone. Analysed modified multi-channel cyclone can be effectively treated from fine particulate matter, during the cleaning of aggressive gas flow an adhesion/cohesion phenomena could be reduced. Research of aerodynamic parameters it’s the first step of studies to determine the optimal case, at the average gas flow velocity in cyclone channels were 8, 12 and 16 m/s, the gas flow dynamics dependencies into cyclone were determined.

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The Features of Measuring the Gas Flow Velocity in Pipes by an Ultrasonic Correlation Method

Acoustical Physics ◽

10.1134/s1063771021020044 ◽

2021 ◽

Vol 67 (2) ◽

pp. 216-221

Author(s):

A. D. Mansfeld ◽

G. P. Volkov ◽

R. V. Belyaev ◽

A. G. Sanin ◽

P. R. Gromov ◽

...

Keyword(s):

Flow Velocity ◽

Gas Flow ◽

Correlation Method ◽

Gas Flow Velocity

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METHODS OF MAINTAINING THE PROJECT LEVELS OF GAS PRODUCTION AT THE FINAL STAGE OF DEVELOPMENT OF DEPOSITS

Oil and Gas Studies ◽

10.31660/0445-0108-2017-4-80-83 ◽

2017 ◽

pp. 80-83

Author(s):

E. V. Panikarovskii ◽

V. V. Panikarovskii

Keyword(s):

Flow Velocity ◽

Final Stage ◽

Gas Flow ◽

Gas Production ◽

Stage Of Development ◽

Surfactant Solutions ◽

Gas Flow Velocity

In the case of self-kill of wells, the gas flow velocity in the lifting column is not sufficient for carrying to the surface of the liquid, accumulated in the wellbore. To remove liquid from the bottom of wells, solid and liquid surfactants are used. As a result of conducted studies of surfactant compositions, the components of surfactant solutions were chosen to remove liquid from the bottom of wells.

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Effects of Shield Gas Flow on Meltpool Variability and Signature in Scanned Laser Melting

Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering; Manufacturing Equipment and Automation ◽

10.1115/msec2020-8410 ◽

2020 ◽

Author(s):

David C. Deisenroth ◽

Jorge Neira ◽

Jordan Weaver ◽

Ho Yeung

Keyword(s):

Additive Manufacturing ◽

Aspect Ratio ◽

Flow Velocity ◽

Process Monitoring ◽

Gas Flow ◽

Laser Energy ◽

Flow Speed ◽

Powder Bed ◽

Flow Speeds ◽

Gas Flow Velocity

Abstract In laser powder bed fusion metal additive manufacturing, insufficient shield gas flow allows accumulation of condensate and ejecta above the build plane and in the beam path. These process byproducts are associated with beam obstruction, attenuation, and thermal lensing, which then lead to lack of fusion and other defects. Furthermore, lack of gas flow can allow excessive amounts of ejecta to redeposit onto the build surface or powder bed, causing further part defects. The current investigation was a preliminary study on how gas flow velocity and direction affect laser delivery to a bare substrate of Nickel Alloy 625 (IN625) in the National Institute of Standards and Technology (NIST) Additive Manufacturing Metrology Testbed (AMMT). Melt tracks were formed under several gas flow speeds, gas flow directions, and energy densities. The tracks were then cross-sectioned and measured. The melt track aspect ratio and aspect ratio coefficient of variation (CV) were reported as a function of gas flow speed and direction. It was found that a mean gas flow velocity of 6.7 m/s from a nozzle 6.35 mm in diameter was sufficient to reduce meltpool aspect ratio CV to less than 15 %. Real-time inline hotspot area and its CV were evaluated as a process monitoring signature for identifying poor laser delivery due to inadequate gas flow. It was found that inline hotspot size could be used to distinguish between conduction mode and transition mode processes, but became diminishingly sensitive as applied laser energy density increased toward keyhole mode. Increased hotspot size CV (associated with inadequate gas flow) was associated with an increased meltpool aspect ratio CV. Finally, it was found that use of the inline hotspot CV showed a bias toward higher CV values when the laser was scanned nominally toward the gas flow, which indicates that this bias must be considered in order to use hotspot area CV as a process monitoring signature. This study concludes that gas flow speed and direction have important ramifications for both laser delivery and process monitoring.

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Research on the Influence of Furnace Structure on Copper Cooling Stave Life

High Temperature Materials and Processes ◽

10.1515/htmp-2017-0040 ◽

2019 ◽

Vol 38 (2019) ◽

pp. 1-7

Author(s):

Feng-guang Li ◽

Jian-liang Zhang

Keyword(s):

Service Life ◽

Flow Velocity ◽

Gas Flow ◽

Flow Distribution ◽

Distribution Model ◽

Variational Structure ◽

Shaft Angle ◽

The Stability ◽

Gas Flow Velocity ◽

Copper Stave

AbstractIn this paper, a blast furnace gas flow distribution model with variable furnace structure was founded based on CFD (computational fluid dynamics) theory, and the gas velocity distribution near the surface of the copper staves in different areas of the BF is calculated under different conditions of variational structure parameters like Bosh angle, shaft angle, and the newly proposed “equivalent Bosh angle.” Based on the calculation, the influence rule of the BF structure on the service life of copper stave and the corresponding operation measures were obtained. The result shows that the increase of the Bosh angle and the decrease of the shaft angle will incur increasing of the gas flow velocity near the surface of the copper staves, which is harmful to the cooling stave life; the variation of the equivalent Bosh angle has a most significant influence on the cooling stave life, and the increase of the equivalent Bosh angle will cause a sharp increase of the gas flow velocity, which will damage the copper staves seriously; adopting long tuyeres and minishing the equivalent Bosh angle will reduce the washing action of the gas flow and ensure the stability of slag hanging to achieve a long service life of copper staves.

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