Ultrasonic nozzle for use in metallurgical installations and method for dimensioning an ultrasonic nozzle

A technology for supersonic nozzles and metallurgical equipment, applied in lighting and heating equipment, special data processing applications, computer-aided design, etc., can solve problems such as the need to replace gun heads, achieve good internal flow characteristics, save copper materials, and improve wear resistance performance effect

Active Publication Date: 2015-07-01
SMS DEMAG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After this time, the nozzle edge wears down so much that there is a risk of water breakdown of the water-cooled supersonic nozzle and the nozzle tip has to be replaced

Method used

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  • Ultrasonic nozzle for use in metallurgical installations and method for dimensioning an ultrasonic nozzle
  • Ultrasonic nozzle for use in metallurgical installations and method for dimensioning an ultrasonic nozzle
  • Ultrasonic nozzle for use in metallurgical installations and method for dimensioning an ultrasonic nozzle

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Embodiment Construction

[0029] Different embodiments of the disclosure are described below, wherein the same reference symbols are used for identical or similar components and a repeated description is partially omitted.

[0030] figure 1 The schematic Mach number distribution inside and outside of a Laval supersonic nozzle (which operates with oxygen) is shown. Oxygen enters the atmosphere here at 1650°C.

[0031] It is evident here that in figure 1 In the design state shown in a, that is, when the pressure p at the outlet cross-section e equal to the ambient pressure p u , allowing essentially undisturbed flow.

[0032] exist figure 1 b shows the underexpansion (Unterexpansion), where the ambient pressure p u is less than the pressure p at the outlet cross-section e . Disturbing jet streams are clearly recognizable here.

[0033] exist figure 1 c shows the overexpansion (Ueberexpansion), that is, in which the ambient pressure p u greater than the outlet cross-section p e place pressure....

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Abstract

The invention relates to a supersonic nozzle for use in metallurgical installations, in particular for the top blowing of oxygen in a Basic Oxygen Furnace (BOF) or an electric arc furnace (EAF), comprising a convergent portion and a divergent portion, which are adjacent to each other at a nozzle throat (DK), wherein the supersonic nozzle is defined by the following group of nozzle forms in the respective design case thereof: (T1).

Description

technical field [0001] The invention relates to a supersonic nozzle used in a metallurgical plant and to a method for dimensioning such a supersonic nozzle. Background technique [0002] Supersonic nozzles or also Laval supersonic nozzles find a wide range of use in the field of metallurgical applications. For example, in steel production in a BOF converter (Basic Blown Oxygen Furnace) oxygen is top-blown into the metal bath by means of lances. [0003] Also in the field of electric arc furnaces (EAF), supersonic nozzles are used in injectors for blowing in oxygen or in burners for melting waste. [0004] A supersonic nozzle for a device for injecting oxygen or other process gases is known, for example, from WO 00 / 28096 A1, which can be used in metallurgical processes, especially when melting metals. A mathematical method for designing the wall profiles of the converging and diverging nozzle parts of a Laval supersonic nozzle is described here, where a method based on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/46F27B3/22F27D3/16
CPCG06F17/5009F27B3/225C21C5/4606F27D3/16F27D2003/169F27D2003/164C21C5/5217G06F30/17Y02P10/20C21C5/46F27B3/22G06F30/00G06F30/20G06F30/28G06F2113/08
Inventor H-J. 奥登塔尔J. 施吕特H. 奥利维尔I. 克利奥切尼科夫
Owner SMS DEMAG AG
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