Melting furnace of metals and melting method thereof

Details Melting furnace of metals and melting method thereof Melting furnace of metals and melting method thereof

1997-04-04

1999-03-30

Kastler, Scott

Metallurgical apparatus

Process

266200, 266212, 266900, F27D 1300

Patent

active

058884580

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a melting furnace of metals, for example, scraps or ores of iron, copper, aluminum, etc. and to melting method of these metals, using oxygen burners only to which oxygen or oxygen-rich air is supplied as a combustion assisting gas.


BACKGROUND ART

There are known metal melting furnaces in which fossil fuels are burned with burners using oxygen or oxygen-rich air as a combustion assisting gas, and scraps or ores of iron, copper, aluminum, etc. are melted by the heat of combustion thus generated. Such melting furnaces are described, for example, in Japanese Unexamined PCT Publication No. 501810/1981, and Japanese Unexamined Patent Publication Nos. 215919/1989, 93012/1990, 271804/1993 and 271807/1993.
While these melting furnaces generally are each provided with a melting section where a metallic raw material is melted using oxygen burners and a preheating section where the metallic raw material is preheated, the preheating section is located, in the melting furnaces described in Japanese Unexamined PCT Publication No. 501810/1981 and Japanese Unexamined Patent Publication No. 215919/1989, above the melting section via a closing grid so as to preheat a next charge of metallic raw material on the grid. However, in the metal melting furnace having such iron grid above the melting section, the iron grid is exposed to high temperature, so that it must be cooled with water and the like, causing a great heat loss. These melting furnaces further involve problems of water leakage, troubles in opening and closing the iron grid, etc. due to severe environment to which the melting furnace is exposed.
Meanwhile, in the melting furnace described in Japanese Unexamined Patent Publication No. 271807/1993, which is a so-called reverberatory furnace, a metallic raw material is introduced gravitationally into the melting section while it is preheated by the discharge gas from the melting section when the metallic raw material passes through a slant passage defined in the wall of the furnace. In this case, however, the hot discharge gas tends to flow the upper space of the slant passage serving as the preheating section, so that it is difficult to preheat fully the metallic raw material falling through the lower part of the slant passage, and it is also difficult to control the falling speed of the metallic raw material, because the material is introduced by natural fall.
Generally, in a melting furnace integrated with the preheating section where the metallic raw material is preheated, the rate of introducing the metallic raw material from the preheating section into the melting section significantly influences the heat efficiency. More specifically, the metallic raw material is preferably introduced at the same rate as it is melted in the melting section. If the introducing rate is too high, the large amount of unmelted metal remains as a mixture with the molten metal at the bottom of the melting section, and further there may occur a phenomenon that the molten metal resumes the solid state due to heat loss from the bottom of the furnace. On the other hand, if the introducing rate is too low, it takes much time for introducing the metallic raw material to consume extra energy.
After the metallic raw material is melted in the metal melting furnace, the molten metal in the melting section must be tapped into a ladle and the like. In the case of a relatively small melting furnace, the entire furnace is designed to be tilted to tap the molten metal from a tapping port provided on one side of the melting section. However, in the case of a large melting furnace, since there are problems of securing space for tilting the entire furnace and installation of a large driving mechanism for tilting the furnace, the tapping port is provided at the bottom of the melting section to tap the molten metal through Accordingly, the structure of the melting section is complicated, so that not only the production cost is increased but also maintenance of refractory materials and the like also costs high.

REFERENCES:
patent: 2161180 (1939-06-01), Marx
patent: 2283163 (1942-05-01), Brassert et al.
patent: 4291634 (1981-09-01), Bergsten et al.
patent: 4556418 (1985-12-01), Syska

Affiliated with

Also associated with

Rating

Melting furnace of metals and melting method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Melting furnace of metals and melting method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Melting furnace of metals and melting method thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1211352