JPH04154926A - Melting furnace for aluminum - Google Patents

Abstract

PURPOSE:To quickly heating Al with good thermal efficiency by arranging plural burners at furnace side wall, directing combustion flame of each burner as slanting to molten metal surface in a furnace and forming circular flow in the whole furnace. CONSTITUTION:A cover body 21 is applied on the upper face of a cylindrical body 11, and in the side wall 12, an operating hole 31 and a gas exhaust hole 41 are facingly opened and e.g., six pieces of the burners 51-56 are set therein. The burners 51-56 are positioned so as to divide cross sectional face of the side wall 12 into almost six parts and five pieces of the burners 51-55 are set so that these combustion flames direct to the molten metal M (the molten metal surface after melting Al metal or Al scrap) and form the revolving flow in the furnace as a whole. Further, remaining one burner 56 near the gas exhaust hole 41 at the upstream side of this revolving flow is set so that the combustion flame directs to the molten metal surface M and shuts off the gas exhaust hole 41. By this method, the molten metal can be heated mainly with convection heat of the combustion flame forming the revolving flow, and the heating is quickly executed with good thermal efficiency.

Description

[Detailed description of the invention] 〈Industry〉Second field of use〉 The present invention relates to an aluminum melting furnace.

For melting aluminum ingots and aluminum scraps,
Also, aluminum melting furnaces are used for alloying and refining molten aluminum. There are various kinds of aluminum melting furnaces, such as a stationary type, a tilting type, a circular furnace, and a square furnace.

The present invention relates to an improvement in an aluminum melting furnace as described in "-".

<Prior art and its problems> Conventionally, an aluminum melting furnace is equipped with a plurality of burners on the side wall of the furnace, and the burners direct the combustion flame in the opposite direction of the exhaust port opened on the side wall of the furnace. A device that is arranged so as to be used is used. This is because if the combustion flame of the burner is short-circuited to the exhaust port, thermal energy is wasted.

However, such conventional aluminum melting furnaces mainly heat the furnace wall with the combustion flame of the burner, and heat aluminum scrap, molten aluminum, etc. with radiant heat from the heated furnace wall, so the thermal effectiveness of the furnace is low. The problem is that the heating is slow and the heating is slow.

<Problems to be Solved by the Invention, Means for Solving the Problems> The present invention provides an improved aluminum melting furnace that solves the conventional problems such as window glazing.

Therefore, in the present invention, the side wall of the furnace is equipped with a plurality of burners, and the burners are arranged so that their combustion flames are directed obliquely to the surface of the molten metal in the furnace and form a swirling flow in the furnace as a whole. An aluminum melting furnace is characterized in that it is equipped with a plurality of burners on the side wall of the furnace, and one of the burners, which is close to the exhaust port, causes its combustion flame to flow through the exhaust port. Aluminum melting characterized in that the other burners are arranged so that the combustion flame thereof is directed obliquely to the surface of the molten metal in the furnace and forms a swirling flow in the furnace as a whole. Relating to furnaces.

Function> In the present invention, the burner is arranged so that its combustion flame is directed obliquely to the surface of the molten metal in the furnace and forms a swirling flow within the furnace as a whole. According to the present invention, aluminum scrap, molten aluminum, etc. can be heated mainly by the convection heat of the combustion flame that forms a swirling flow, so thermal efficiency is good and heating is quick. Among the plurality of burners installed on the side wall of the furnace, one burner close to the exhaust port is preferably arranged so that its combustion flame blocks the exhaust port. This is to lengthen the residence time of the swirling flow in the furnace and to effectively utilize convective heat due to the swirling flow. Furnaces equipped with a plurality of burners, whether stationary, tilting, round or square, are correspondingly effective, but the above-mentioned swirling furnaces are more preferred. It is particularly effective in forming a flow in the case of a circular furnace.

Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings.

<Embodiment> FIG. 1 is a longitudinal cross-sectional view schematically showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing the embodiment.

The illustrated embodiment is a tilting circular furnace equipped with a tilting means (for example, a cylinder mechanism), which is not shown, at the bottom of the furnace. An operating port 31 and an exhaust port 41 are provided opposite to each other in the side wall 12 of the main body 11, and a door 32 that can be opened and closed is attached to the operating port 31. A total of six burners 51 to 56 are installed on the side wall 12.

The burners 5] to 56 have a cross section of the cylindrical side wall 12 approximately 6
It is equipped at the dividing position, and a total of 5 of these
In the burners 51 to 55, the combustion flame is the molten metal surface M (
When melting aluminum ingots or aluminum scrap, the furnace is arranged so as to face the surface of the molten metal after melting these metals and to form a swirling flow in the furnace as a whole, and an exhaust port is installed on the upstream side of the swirling flow. Remaining 1 close to 41
The burner 56 is arranged so that its combustion flame is directed toward the molten metal surface M in the furnace and blocks the exhaust port 41.

In FIG. 2, the burner 51 installed on the cylindrical side wall 12 is arranged diagonally downward at an angle θ with respect to the straight line connecting its nozzle portion and the center point C of the molten metal surface M. The combustion flame of the burner 51 is directed toward a so-called tangential region 51a of a circle R having an imaginary center point C on the molten metal surface M. The burners 52 to 55 are also arranged in the same manner as the burner 51, and their combustion flames are directed toward so-called tangential regions 52a to 55a of the circle R, respectively. The burners 51 to 55 are arranged so that their combustion flames are directed obliquely toward the molten metal surface M and form a swirling flow as a whole. On the other hand, the burner 56 is arranged diagonally downward with an opening angle θ2 that is slightly larger than the angle θ, and the combustion flame of the burner 56 is directed to an intermediate region outside the circle R imaginary on the molten metal surface M. 56
It is oriented toward a. The burner 56 has its combustion flame on the molten metal surface M
is directed obliquely and is arranged so as to block the exhaust port 41 to prevent the swirling flow from short-circuiting to the exhaust port 41.

Although the drawing shows an example in which a total of six burners are installed, the number of burners can be selected as appropriate depending on the shape and size of the furnace as long as the total number is two or more.

<Effects of the Invention> As is already clear, the present invention described above has a high thermal efficiency because aluminum scrap, molten aluminum, etc. can be heated mainly by the convection heat of the combustion flame that forms a swirling flow in the furnace. It has the effect of heating quickly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view schematically showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing the embodiment. II...Body, I2...Side wall 4I...Exhaust port, 51-56...Burner M...
...Patent applicant for molten metal surface Daido Steel Co., Ltd. Patent attorney Hiromasa Iriyama

Claims (1)

[Claims] 1. A plurality of burners are installed on the side wall of the furnace, and the combustion flames of the burners are directed obliquely to the surface of the molten metal in the furnace and form a swirling flow in the furnace as a whole. An aluminum melting furnace characterized by being arranged in. 2. A plurality of burners are installed on the side wall of the furnace, and among the burners, one burner close to the exhaust port is arranged so that its combustion flame blocks the exhaust port, and the other burners are placed close to the exhaust port. An aluminum melting furnace characterized in that the combustion flame is arranged so as to direct the molten metal surface obliquely and to form a swirling flow within the furnace as a whole. 3. The aluminum melting furnace according to claim 1 or 2, wherein the furnace is a circular furnace.