2 edition of Use of electromagnetic force to reduce clogging in tundish nozzles. found in the catalog.
Use of electromagnetic force to reduce clogging in tundish nozzles.
Ladislau Istvan Kadar
Written in English
|The Physical Object|
|Number of Pages||180|
depends on the casting speed, tundish level, and nozzle bore diameter and is quantified in this work for a typical nozzle and range of conditions. INTRODUCTION Nozzle clogging is one of the most disruptive phenomena in modern continuous casting operation. Argon injection into the nozzle is widely employed to reduce nozzle clogging. An important factor affecting the durability of a ladle nozzle is clogging due to steel deoxidation products deposition in the nozzle channel. The phenomenon of clogging makes it difficult to regulate the rate of steel outflow from the ladle and, in extreme cases, can make the nozzle Cited by: 1.
The three nozzles were adopted for investigating the nozzle-clogging effects on surface flow and vortex formation, as shown in Figure 2. These nozzles have typical bifurcated, 35° down-angled rectangular ports with a mm-deep well. Clogged nozzles have the . Numerical evaluation of a submerged entry nozzle for continuous casting of steel C A Real-Ramirez*, R Miranda-Tello, L Hoyos-Reyes, M Reyes & J I Gonzalez-Trejo tundish receive the liquid steel coming from the deposited on the inner-walls of the submerged nozzle. The clogging occurs when a non-metallic cluster is attached to the inner.
For example, when nozzles wash mesh fabrics with an operating pressure of 3 bar, this pressure is higher than a spring force of 1 bar. Piston and nozzle body come close producing a flat fan. If the inlet pressure is reduced to bar, lower than a spring force of 1 bar, piston and nozzle body separate opening to the maximum distance. Nozzles A few other things should be addressed: First, if it is the nozzle that actually is clogging, you must look up-stream in the oil flow. If the pump strainer or fuel filter are contaminated, they will continue to feed that mess to the nozzle. A weak spark, or poorly adjusted spark .
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Application of electromagnetic forces to reduce tundish nozzle clogging. This paper considers the problem of oxide build-up within a tundish nozzle when casting aluminum killed steel. Water model studies have shown that the clogging problem may be very dependent on the flow pattern in the nozzle.
To reduce the possibility of nozzle clogging, the separation zone must be significantly reduced, if not eliminated. This may be achieved by introducing a force production mechanism that causes the metal in the separation zone to move downward. The possibility using electromagnetic forces to produce the necessary motion is explored in this paper.
by: Nozzle wall coatings may help to reduce attachment . The best way to avoid this source of clogging is to minimize the number of solid inclusions passing through the nozzle.
Inclusions making up a clog would otherwise end up in the final product, where. Droplet Formation with Electromagnetic Pulse Force. Methods for serial generation of droplets from a liquid jet are shortly reviewed. A method of liquid metal droplet generation based on AC high frequency magnetic field is considered in detail.
Numerical model for direct simulation of the time dependent droplet generation process is presented. A nozzle clogging online forecasting model based on hydrodynamics engineering was developed, in which the actual flow rate was calculated from the mold width, thickness, and casting speed.
Clogging of tundish nozzles limits the productivity and adversely affects the quality of continuous cast steel. This project seeks to quantify the prediction and detection of clogs caused by air aspiration into low pressure regions on the nozzle. Examination of the phenomenon of nozzle blockage, encountered during casting of aluminum-killed steel, resulted in the following conclusions: 1.
The mechanism of clogging is a complex process involving the precipitation of alumina in the bore of the nozzle augmented by dendritic growth of entrapped steel. At low aluminum concentrations (<% Al soluble), the alumina branches were Cited by: 9. Nozzle clogging prediction in continuous casting of steel.
Submerged entry nozzle connects the tundish and the mold in the continuous casting of steel. Continuous casting is usually done in series including 3–6 successive heats.
Casting of a heat takes about 35–50 minutes. The most effective way to prevent, or at least lessen, nozzle clogging in the continuous casting of steels is to modify the inclusions in the steel to a liquid rather than a solid at steel casting temperatures (2). This is typically done by the addition of calcium to the steel at the end of the steel refining process.
The black nozzle seems to be partially clogged. I'm working on getting a good photo of the heads (kind of hard to get in there with a camera) but attached is a photo of a test pattern. I've been doing a lot of nozzle washes and printing, but so far seem kind of stalled.
Many solutions have been used to reduce the propensity for clogging in silicon killed steels: low aluminum ferro alloys; tundish slide gate nozzle change systems; calcium and calcium – silicon wire injection systems; and increasing the oxygen content of the liquid steel in the ladle and Size: KB.
The three-dimensional fluid flow and inclusion motion in the tundish, SEN and the mold were simulated in order to predict the inclusion removal during casting and to better describe the clogging.
Electromagnetic Devices for Continuous Steel Casting Tundishes Rajneesh Chaudhary1a, K. Ravi Kumar1b, Martin Seden2a, Bengt Rydholm2b, Jan-Erik A. Eriksson2c, Hongliang Yang2d 1 ABB Corporate Research Center, Bangalore, India.
2 CoE Metallurgy Products, Process Automation-Industry Solutions, Sweden. Corresponding author: [email protected]: Rajneesh Chaudhary, K. Ravi Kumar, Martin Seden, Bengt Rydholm, Jan-Erik A.
Eriksson, Hongliang Yang. tundish well is not possible during the casting operation. Thus precise measure of nozzle clogging is necessary to know the extent of clogging during casting operation. Many researchers  have developed a clogging index factor by comparing the theoretical steel flow rate to the actual value.
changing casting speed if the need arises or for changing the nozzle if erosion, cracking or clogging occurs. Open casting means no steel jet protection during transfer from ladle to tundish and from tundish to molds, with an exception for low carbon steel.
In some cases, the injection of aluminum wire into the mold is still Size: KB. The tundish bottom has one or more nozzle port(s) with slide gate(s) or stopper rod(s) for controlling the metal flow.
The vessel is often divided into two sections i.e. an inlet section, which generally has a pouring box where steel melt is fed from the ladle and an outlet section from which melt is Price: $ Electromagnetic flow control valve for a liquid metal.
Abstract An electromagnetic flow control valve for an electrically conductive liquid having a plurality of coils and yokes surrounding a non-metallic, such as alumina, tube through which an electrically conducting liquid, such as liquid metal, by: 9.
Tundish Nozzle Mold Strand Fig. The continuous casting process. Stopping rod Tundish Nozzle Clogging areas Mold level Fig. Location of the submerged entry nozzle in the continuous casting process.
Reasons and remedies There are several reasons that contribute to nozzle clogging: metallurgical factors: steel cleanness and aluminium. Refractory products for Tundish application Mono Block Stopper (Stopper rod) Tundish Slag Dam The Tundish slag dam is an auxiliary product.
used with multiples kinds of Tundish nozzles. Our Tundish well block shows excellent strength, high thermal shock stability and erosion. Steps (a) and (b) of Fig. 1 are supposed to be major mechanisms for clogging/fouling, i.e. the hydrodynamic transport of particles and the adhesion mechanism .For example, a study on fouling in a heat exchanger (water flow with silica suspensions of ~1 μm) shows that hydrodynamic lift forces gain complete control of the deposition process, and thermophoresis enhances deposition onto cooled Cited by: 4.
Preventing clogged nozzles in high pressure misting systems. This prevents stagnant water from sitting in the mist tubing and will greatly reduce the number of clogged misting nozzles that occur. Don’t let a high pressure misting system sit unused for long periods of time. Even with a drain valve installed, small amounts of water can.The first way that we always recommend for partially blocked nozzles is to use cleaning filament regularly - however, that won't unblock a fully clogged nozzle.
Let’s take a look at some of these other methods for how to clean a clogged 3D printer nozzle. If you've only got a partial blockage or slight under extruding though, there is a much. During the cold spray process, nozzle clogging always happens when spraying low-melting point materials, e.g., aluminum, significantly decreasing the working efficiency.
In this paper, a comprehensive investigation was carried out to clarify the reason for inducing nozzle clogging and then to evaluate a home-made nozzle cooling device for preventing nozzle by: