scholarly journals Effects of Tuyere Gas Flow Rate and Deadman Properties on Discontinuous Behavior of Descending Solid and Gas Static Pressure in Blast Furnace-Experimental Analysis by a Three-Dimensional Cold Model-

2007 ◽  
Vol 93 (10) ◽  
pp. 615-624 ◽  
Author(s):  
Hiroshi TAKAHASHI ◽  
Hideki KAWAI ◽  
Toshifumi FUKUI ◽  
Yuuki MATSUMOTO ◽  
Yoshiyuki MATSUI
Keyword(s):  
Blast Furnace ◽  
Flow Rate ◽  
Experimental Analysis ◽  
Gas Flow ◽  
Static Pressure ◽  
Three Dimensional ◽  
Gas Flow Rate ◽  
Cold Model

Effect of shielding gas flow rate on arc behaviors in GMAW with single cable-typed wire

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040059
Author(s):  
Qingxian Hu ◽  
Lei Zhang ◽  
Juan Pu ◽  
Caichen Zhu
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Maximum Flow ◽  
Maximum Pressure ◽  
Arc Plasma ◽  
Shielding Gas ◽  
Gas Flow Rate

A three-dimensional numerical model of arc in gas metal arc welding (GMAW) with single cable-typed wire was established based on the theory of arc physics. The influences of different shielding gas flow rates on the features of temperature field, velocity field and pressure field were investigated. The results showed that the maximum velocity of arc plasma along radial direction and the arc pressure on the surface of workpieces were increased obviously with the increase of the shielding gas flow rate, while the arc temperature was changed little. This phenomenon was mainly attributed to the increasing collisions between arc plasmas and the self-rotation action of cable-typed wires. The arc temperature at the tip of the cable-typed wire reached the maximum. The maximum flow velocity of arc plasma was located at the tip of wire (2–8 mm). The arc pressures in the central axis reached the maximum pressure. The simulation results were in agreement with the experimental results.

scholarly journals Improving the blast furnace process by raising the natural gas flow rate in the upper heat exchnage stage

2017 ◽  
Vol 15 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Salavat K. Sibagatullin ◽  
◽  
Aleksandr S. Kharchenko ◽  
Vitaly A. Beginyuk ◽  
Valentin N. Selivanov ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Blast Furnace Process ◽  
Gas Flow Rate ◽  
Furnace Process ◽  
Natural Gas Flow

Commercial trial of a gas flow-rate control system to intensify heating of blast-furnace-stove checkerwork

Metallurgist ◽  
1984 ◽  
Vol 28 (10) ◽  
pp. 335-336
Author(s):  
S. L. Solomentsev ◽  
B. L. Markov ◽  
V. K. Sigmund ◽  
S. M. Basukinskii ◽  
A. P. Pukhov ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Control System ◽  
Flow Rate ◽  
Rate Control ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Commercial Trial ◽  
Flow Rate Control

Effect of Gas Injection with Multi-hole Orifices on Bubble Behavior during Metal Refining

2011 ◽  
Vol 233-235 ◽  
pp. 1940-1945
Author(s):  
Fang Jiang ◽  
Guo Guang Cheng ◽  
Hai Kuo Yang
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Radial Direction ◽  
Gas Injection ◽  
Hole Diameter ◽  
Bubble Coalescence ◽  
Gas Flow Rate ◽  
Bubble Behavior ◽  
Cold Model ◽  
Optimal Distance

Cold model experiments have been conducted to make clear the effect of orifices on bubble behavior based on the comparison of 1-hole and 4-hole configurations. It is found that this effect is closely related to the gas flow rate and the orifice configuration. For 1-hole orifices, bubble behavior is influenced by the hole diameter at low gas flow rate. Nevertheless, in the region of high gas flow rate, this effect becomes less obvious. However, bubble behavior is strongly affected even at high gas flow rate when 4-hole orifices are used. It is also shown there exists an optimal distance between holes for 4-hole orifices. Below this value, the hole distance is too small to adequately avoid bubble coalescence in the radial direction. Above this value, little further contribution to avoidance of bubble coalescence can be made, but weight and cost of the orifices will increase.

Computational Analysis of a Three-Dimensional Plasma Spray Jet

1997 ◽  
Author(s):  
B. Dussoubs ◽  
P. Fauchais ◽  
A. Vardelle ◽  
M. Vardelle ◽  
N.J. Themelis
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Control Volume ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Gas Flow Rate ◽  
Fluid Turbulence ◽  
Energy Equations ◽  
S Model ◽  
Carrier Gas Flow

Abstract An analysis of a d.c. plasma jet is presented using a three-dimensional commercial fluid dynamics code, ESTET. This code solves the coupled conservation equations of mass, species, momentum and thermal energy equations for a compressible and turbulent fluid in control volume and finite difference formulation. Computations take into account fluid turbulence using a standard k-s model with the Launder and Sharma correction for the laminar zones, e.g. the plasma core. Two series of spraying conditions differing in the total gas flow rate (30 and 60 slm) and the arc current (300 and 600 A, respectively) are computed. The process parameters are independently varied about the nominal operating conditions. The effect of the variation of primary and secondary gas flow rate, effective power and powder carrier gas flow rate on flow fields characteristics, is discussed.

Three-Dimensional Arc Modeling inside Non-Transferred Plasma Torch

2012 ◽  
Vol 217-219 ◽  
pp. 1407-1410
Author(s):  
Hai Ling Han ◽  
Qing Lin Wang
Keyword(s):  
Flow Rate ◽  
Plasma Torch ◽  
Gas Flow ◽  
Numerical Models ◽  
Three Dimensional ◽  
Arc Length ◽  
Gas Flow Rate ◽  
Three Dimensional Model ◽  
Anode Spot ◽  
The Given

Numerical models have been developed to study the characteristics of an arc inside the non-transferred plasma torch. A few of them have considered the diameter of anode spot and arc length in given current and gas flow rate. In this work, a three-dimensional model is developed to simulate power and entropy in the given current and diameter of anode spot. Different combinations of diameter of anode spot and arc length can produce torch power that corresponds to given current and gas flow rate. From the possible combinations of the diameter of anode spot and arc length predicted for given current and gas flow rate, the most feasible combination is obtained.

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

Sign in / Sign up

Export Citation Format

Share Document