Experimental studies on the changing characteristics of the gas flow capacity on bituminous coal in CO2-ECBM and N2-ECBM

Fuel ◽  
2021 ◽  
Vol 291 ◽  
pp. 120115
Author(s):  
Lei Zhang ◽  
Jinghua Li ◽  
Junhua Xue ◽  
Cun Zhang ◽  
Xinqiu Fang
Keyword(s):  
Gas Flow ◽  
Bituminous Coal ◽  
Experimental Studies ◽  
Flow Capacity

Chemistry of the Gasification of Carbonaceous Raw Material

2021 ◽  
Vol 1045 ◽  
pp. 67-78
Author(s):  
Pavlo Saik ◽  
Roman Dychkovskyi ◽  
Vasyl Lozynskyi ◽  
Volodymyr Falshtynskyi ◽  
Edgar Caseres Cabana ◽  
...  
Keyword(s):  
Gas Flow ◽  
Experimental Studies ◽  
Reaction Channel ◽  
Raw Material ◽  
Gas Generator ◽  
Equal Concentration ◽  
Gasification Process ◽  
Gasification Rate ◽  
Gasification Products ◽  
Gas Flow Velocity

The paper represents the studies of the process of carbonaceous raw material gasification. The initial material is represented by bituminous coal of grade H with the carbon (C) content of 79.2-85.3 %. Experimental studies have been used to substantiate the parameters of combustible generator gases (СО, Н2, СН4) output depending on the temperature of a reduction zone of the reaction channel and gas flow velocity along its length. It has been identified that the volume of the raw material input to be used for gasification process changes in direct proportion depending on the amount of burnt-out carbon and blow velocity. The gasification is intensified in terms of equal concentration of oxygen and carbon in the reaction channel of an underground gas generator. The gasification rate is stipulated by the intensity of chemical reactions, which depend immediately on the modes of blow mixture supply. Moreover, they depend directly on the intensity of oxygen supply to the coal mass and removal of the gasification products.

scholarly journals Simulation of Thermoplastic Powder Cold Spraying

2021 ◽  
Vol 14 (6) ◽  
pp. 726-734
Author(s):  
Tatyana A. Brusentseva ◽  
◽  
Vladislav S. Shikalov ◽  
Sergei M. Lavruk ◽  
Vasily M. Fomin
Keyword(s):  
Gas Flow ◽  
Experimental Studies ◽  
Cold Spraying ◽  
Deposition Efficiency ◽  
Powder Materials ◽  
Stagnation Temperature ◽  
Computational Domain ◽  
Ansys Fluent ◽  
Process Gas ◽  
Spray Method

The work is devoted to the deposition of composite powder materials by cold spray method. As a spraying material, a thermoplastic compound «WAY» for marking the roadway was used. An asphalt concrete was used as a substrate. As a result of experimental studies, the dependence of the deposition efficiency on the stagnation temperature of the working air in the ejector nozzle was obtained. The ANSYS Fluent package was used for evaluative modeling of the cold spraying process. Gas flow patterns were obtained in the computational domain without particles and taking into account the interaction of the flow with particles. The trajectory of the particles was calculated for various spraying parameters

scholarly journals Improving the performance of the air-cooling unit in the cooling system of a radar

2021 ◽  
Vol 2057 (1) ◽  
pp. 012004
Author(s):  
Yu A Borisov ◽  
V V Volkov-Muzilev ◽  
D A Kalashnikov ◽  
H S Khalife
Keyword(s):  
Heat Exchanger ◽  
Gas Flow ◽  
Cooling System ◽  
Experimental Studies ◽  
Air Cooling ◽  
Axial Fan ◽  
Gas Dynamic ◽  
Cooling Unit ◽  
Calculation Results ◽  
Axial Fans

Abstract The article discusses the issues of reducing the size of the cooling unit of the antenna of a radar station by improving the gas-dynamic processes occurring in the air-cooling unit. The results of the experimental studies of the gas flow in a plate-fin heat exchanger, being blown by one axial fan are presented. The feasibility of changing the number of axial fans for organizing a more uniform flow around the heat-exchange surfaces has been determined by calculation and theoretical methods. The calculation results are confirmed by experimental studies of the air flow in the segment of the heat exchanger, which is provided by a smaller fan.

scholarly journals A seat microvalve nozzle for optimal gas-flow capacity at large-controlled pressure

2005 ◽  
Vol 14 (2) ◽  
pp. 200-206 ◽  
Author(s):  
W. van der Wijngaart ◽  
A. Thorsen ◽  
G. Stemme
Keyword(s):  
Gas Flow ◽  
Flow Capacity

Numerical and experimental studies of gas flow in a particulate filter

2019 ◽  
Vol 209 ◽  
pp. 115179 ◽  
Author(s):  
J.D. Cooper ◽  
L. Liu ◽  
N.P. Ramskill ◽  
T.C. Watling ◽  
A.P.E. York ◽  
...  
Keyword(s):  
Gas Flow ◽  
Experimental Studies ◽  
Particulate Filter

Numerical and Experimental Investigation on Flow Capacity and Erosion Wear of Blooey Line in Gas Drilling

2017 ◽  
Vol 140 (5) ◽  
Author(s):  
Zhang Ying ◽  
Lian Zhanghua ◽  
Gasser F. Abdelal ◽  
Lin Tiejun
Keyword(s):  
Experimental Method ◽  
Gas Flow ◽  
Impact Force ◽  
Fire Hazard ◽  
Gas Drilling ◽  
Drilling Rig ◽  
Flow Capacity ◽  
Experimental Apparatus ◽  
Cfd Method ◽  
The Impact

Blooey line is a discharge pipe, used to conduct gas to keep drilling rock dust and cuttings away from the drilling rig, reducing the fire hazard and transporting the cuttings to a suitable distance from the well. In this paper, the blooey line's flow capacity and erosion mechanism have been investigated by numerical and experimental method. The model of blooey line, which is commonly used in Sichuan district, China, is established by using a computational fluid dynamics (CFD) method. And, the distribution of pressure field and velocity field in the blooey line are investigated by the CFD model. And, the effect of gas flow rate on impact force and erosion is also discussed. Compared with the simulation results, an experimental apparatus of the blooey line has been conducted under the mechanical similarity principle. The impact force and pressure on the elbows are measured under different gas flow rates. The numerical simulation and experimental method proposed in this paper can provide a reference for layout optimization and flow capacity calculation of blooey line in gas drilling.

Hydrodynamic Characteristics of Mechanically Agitated Air - Aqueous Sucrose Solutions

2014 ◽  
Vol 35 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Magdalena Cudak
Keyword(s):  
Power Consumption ◽  
High Speed ◽  
Gas Flow ◽  
Sucrose Concentration ◽  
Empirical Relationship ◽  
Experimental Studies ◽  
Hydrodynamic Characteristics ◽  
Dimensionless Numbers ◽  
Rushton Turbine ◽  
Sucrose Solutions

Abstract The aim of the research presented in this paper was determination of power consumption and gas hold-up in mechanically agitated aerated aqueous low concentration sucrose solutions. Experimental studies were conducted in a vessel of diameter 0.634 m equipped with high-speed impellers (Rushton turbine, Smith turbine or A 315). The following operating parameters were changed: volumetric gas flow rate (expressed by superficial gas velocity), impeller speed, sucrose concentration and type of impeller. Based on the experiments results, impellers with a modified shape of blades, e.g. CD 6 or A 315, could be recommended for such gas-liquid systems. Power consumption was measured using strain gauge method. The results of gas holdup measurements have been approximated by an empirical relationship containing dimensionless numbers (Eq. (2)).

scholarly journals An Investigation into the Combustion of Mixed Fuel Consisting of Bituminous Coal and Crude Bio-Oil

2015 ◽  
Vol 773-774 ◽  
pp. 1184-1188
Author(s):  
Hazlin Hamdan ◽  
Munawar Zaman Shahruddin ◽  
Ahmad Rafizan Mohamad Daud ◽  
Syed Shatir A. Syed-Hassan
Keyword(s):  
Gas Flow ◽  
Bituminous Coal ◽  
Decomposition Reaction ◽  
Volatile Matter ◽  
Kinetic Evaluation ◽  
Exponential Factor ◽  
Air Atmosphere ◽  
Coal Fuel ◽  
Bio Oil ◽  
Lower Temperature

The combustion of bituminous coal, bio-oil, and their slurry mixtures were performed under air atmosphere using Thermogravimetric Analyzer (TGA). All samples were run from room temperature to 110°C and held for 10 minutes before the temperature was ramped to 1100°C and held again for 10 minutes at 1100°C at the heating rate of 10°C/min and gas flow rate of 50mL/min. Kinetic evaluation was conducted using a simple Arrhenius-type kinetic model with first-order decomposition reaction. Apparent activation energy, Ea, and pre-exponential factor, A, were calculated from the modelling equation. Results reveal that the reactivity of CBS fuel is higher than a single coal fuel to which the addition of bio-oil helps to increase the combustion performance of the blends. The optimum fuel ratio appears at 50:50 ratio with equal contribution of coal and bio-oil properties that contribute to the increase in volatile matter causing maximum combustion rate achievable at much lower temperature compared to single coal fuel.

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