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Method for improving energy supply to a scrap metal pile

A technology of energy supply and waste block, applied in the direction of improvement of process efficiency, lighting and heating equipment, furnace type, etc., can solve problems such as energy impact of metal molten pool, achieve the effect of reducing waste gas problem and eliminating cold zone

Inactive Publication Date: 2009-05-20
PRIMETALS TECH AUSTRIA GMBH
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Problems solved by technology

A further problem is that the spouts in the side walls need to be kept open with hot air after the scrap has melted, with the result that horizontally aligned hot air jets blow the liquid slag onto the opposite wall
In addition, the energy transfer from the post-combustion of the production gas to the metal bath by the hot air jet is affected when there is a layer of liquid slag blown horizontally by the hot air jet

Method used

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  • Method for improving energy supply to a scrap metal pile
  • Method for improving energy supply to a scrap metal pile

Examples

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Embodiment Construction

[0033] The following two examples will explain the method of the present invention in detail. In Example 1, approximately 110 tons of scrap were loaded into a 100-ton furnace. Oxygen enriched 40% 1200°C, 0.9 bar 40000Nm by a hot air lance with means for moving up and down 3 / h hot air. The spray gun consists of five nozzles, a central nozzle and four peripheral nozzles, which are inclined at 15° to the vertical direction of the jet. The diameter of the central spout is 20 cm and the diameter of the peripheral spout is 10 cm. Each spout is fitted with a pipe for injecting natural gas. Natural gas blowing rate is 5000Nm in total 3 / h. Simultaneously 2000Nm 3 / h Oxygen is injected through six bottom tuyeres with a diameter of 12mm.

[0034] In example two the bottom tuyeres are not used at all. Oxygen is supplied through a fixed injection system in the side wall of the furnace, the so-called "coherent jet". This example is based on four injection units evenly distributed...

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Abstract

The present invention relates to a method for improving energy supply when heating and melting waste blocks, wherein preheated oxidizing gas with addition of fossil fuel melts a channel in the waste block and further energy supply is carried out through this channel. An important improvement of the method is achieved by supplying hot air to the waste block from the top.

Description

technical field [0001] The present invention relates to a method of improving energy supply when heating and melting waste blocks. Preheated oxidizing gas fed with fossil fuel melts a channel in the waste mass and further passes through this channel for energy supply. Background technique [0002] Currently, it is common practice to melt the scrap in an electric arc furnace, where the burners provide as much mineral energy as possible. However, the maximum energy thus provided is only 10% of the total energy required. [0003] The use of mineral energy to melt energy is outlined in the publication "Stand der Verfahrenstechnik für das Einschmelzen von Schrott mit fossiler Energie" ("State of Processing Technology for Melting Waste Using Mineral Energy") (Stahl und Eisen, 1990, pp. 109-116) The importance of waste. The publication specifically mentions numerous efforts to develop new methods of melting waste using mineral energy. On an industrial scale, the Two-Converter-P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/56F27B3/20F27B3/22
CPCC21C2005/5258C21C5/52C21C2005/5276C21C5/562C21C2250/02Y02P10/20C21C5/56F27B3/20C21C5/00F27B3/22
Inventor 卡尔·布罗茨曼
Owner PRIMETALS TECH AUSTRIA GMBH
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