JPH06299232A - Method for supplying gaseous fuel to flame treatment device - Google Patents

Abstract

PURPOSE:To uniformly eject flames and to uniformalize the heating quantity per unit area of a metallic strip by previously supplying primary air-contg. gaseous fuel from both ends in the longitudinal direction of the burner at the time of degreasing and annealing. CONSTITUTION:The gaseous fuel 24 is previously regulated to a specified pressure and thereafter, the gaseous fuel 24 of the amt. regulated by a valve 21 in accordance with the instruction of a controller 10 receiving the signal from a measurement point 11 for detecting, for example, the traveling speed of the metallic strip is supplied at the time of subjecting the metallic strip to the flame treatment, then to degreasing or annealing simultaneously therewith. On the other hand, the primary air is supplied by a blower 23 in the quantity regulated by the controller 10. The gaseous fuel 24 and the primary air are supplied through a gaseous fuel supply pipe 12 to a burner 13. The mixture composed of the gaseous fuel and the primary air is supplied from both of both ends A, B in the longitudinal direction of the burner 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process of annealing and degreasing a metal strip after rolling (a metal strip in the present invention means a metal foil or plate having a thickness of 5 μm to 3 mm).
In principle, its wettability in the width and length directions of metal strips,
The present invention relates to a fuel gas supply method for a flame processing apparatus capable of controlling the temperature distribution in the length direction of a burner and the size of the flame for flame processing with high uniformity of surface characteristics such as an oxide film and high productivity.

[0002]

2. Description of the Related Art Many metals are relatively inexpensive and have excellent mechanical suitability for their price. Therefore, they are inexpensive conductive materials and, in the case of precious metals, have excellent chemical corrosion resistance and decorative properties. Therefore, it is widely used as an industrial material and an electric material.

Especially in the fields of packaging materials, electrical materials, daily necessities, ornaments, industrial materials, etc., a large amount of metal foil (about 5 μm to 200 μm) or metal thin plate (about 200 μm to 3 mm) is used for this purpose. Being produced.

These metal strips are generally slab-shaped metal that is rolled using a roll, but the surface after rolling is covered with rolling oil used during rolling, and the metal strips for printing, lamination, etc. Often an obstacle to secondary processing. For this reason, it is usual to anneal the rolled metal strips for degreasing (removal of rolling oil). Usually, it is often done with the metal strip wound in a coil, but it was not without frame treatment.

In this case, when the material of the metal strip is a metal having a relatively high melting point such as iron, it does not matter so much, but when it is a metal having a relatively low melting point such as aluminum, copper or alloys thereof, degreasing is performed. In some cases, softening of the material due to annealing and annealing progresses at the same time, and degreasing may cause excessive softening of the metal.

Especially in the frame processing, the number of metal strips is 1.
Degreasing and annealing are performed by contact with a flame at a temperature of 500 ° C or higher for an extremely short time, so that the flame is ejected uniformly over the entire length of the burner (the width of the metal strip), and the ejection speed is also uniform. Yes, the heating of the metal strip must be uniform over its entire length. If the ejection of the flame is non-uniform, it is unavoidable that degreasing and annealing are non-uniform, and the product is expected to be off-spec.

In order to avoid such troubles, various means such as improvement of the nozzle shape of the burner and thickening of the fuel supply pipe of the burner in order to equalize the fuel gas pressure to the nozzle have been studied. It is not easy to ensure the uniformity of the burner, and a slight error in the control of the burner frame causes troubles such as insufficient degreasing or excessive annealing. Because of this, non-uniformity in the width direction of degreasing, the so-called batch annealing that is annealed while wound in a coil shape that has a problem such as requiring a long time becomes the mainstream, the uniformity of the surface characteristics in the width direction and the length direction, Despite some excellent features such as high productivity, it seems that this was the reason why annealing degreasing by flame treatment was not carried out very often except for special cases.

However, although various measures have been taken for the nonuniformity of metal strip surface characteristics in the width direction and low productivity due to batch annealing, this problem is a basic one. , That solution is extremely difficult.

Therefore, the present invention has decided to improve a frame processing method having advantages such as uniformity of surface characteristics and high productivity.

[0010]

DISCLOSURE OF THE INVENTION According to the present invention, as a condition when a high-temperature frame comes into contact with a metal strip, the frame is uniformly ejected over the entire length of the burner so that the heating amount per unit area of the metal strip is as uniform as possible. The purpose of the present invention is to develop a fuel gas supply method for a flame treatment device for metal strips equipped with an appropriate control means capable of controlling degreasing and annealing.

[0011]

According to the present invention, when degreasing or simultaneously annealing a metal strip by flame treatment, a fuel gas containing primary air is previously supplied from both ends in the length direction of the burner. The above object has been achieved by developing a fuel gas supply method for a flame processing apparatus, which is characterized by supplying gas.

The metal strip to which the present invention is applied is a soft, low-melting metal such as aluminum, copper or an alloy thereof; a noble metal such as gold, silver or platinum; a relatively hard or high metal such as iron or stainless steel. Rolled metal foil (5 to 200 μm or so) of melting point metal, thin metal plate (200 μm)
-3 mm). Particularly, it is preferably used for a metal strip of a soft low melting point metal or a noble metal.

The present invention will be described below by taking an aluminum strip as a representative, but the aluminum strip may be pure aluminum for general industry (including electrolytic aluminum and ordinary pure aluminum) or an aluminum alloy. There is no limit. Although the thickness of the aluminum strip is not particularly limited, it is generally about 5 μm to 3 mm.

The frame treatment is carried out in a rolling process or in a product process where a single aluminum strip such as a separator or slitter is running (especially when two thin foils are rolled in a stack, two sheets may be stacked) or a separator. , A coil-shaped aluminum strip wound by a frame processing device installed in any line between the process from the slitter, etc. to the aluminum strip winder, or through a separator, slitter, etc. This can be performed in the process of installing the offline frame processing device. When considering ease of operation and productivity, it is easier to use the inline method at once.

As for the apparatus, FIG. 1 shows an example of a piping diagram of the burner and the combustion means.

Although the drawing shows that there are two heating pipe systems and all of them are supplied to one burner, the fuel gas is supplied to both end portions in the length direction of the burner (width direction of the aluminum strip). From the above, it suffices to uniformly supply the heat in the length direction, and a burner may be installed for each heating pipe series.

In this case, it is possible to supply only the fuel gas, but it is possible to make the temperature of the flame as high as possible, and to make the fuel gas containing the primary air sufficiently taken in for the stability of combustion. preferable.

That is, after the fuel gas (24) is brought to a constant pressure through a pressure regulating valve or the like, the controller (10) receives a signal from a measuring point (11) for detecting the traveling speed of a metal strip, for example. Supplies a quantity of fuel gas adjusted by the valve (21).

On the other hand, primary air is supplied by the blower (23) in the amount adjusted by the controller (10) as well, and the burner (13) is supplied through the fuel gas supply pipe (12) through the mixing amount, the flashback prevention valve and the like. ) Is supplied to. This fuel gas must be supplied from both ends (A) and (B) in the length direction of the burner.

Although FIG. 1 shows an example in which the fuel supply system is provided with two series, it is natural that the same effect can be obtained even when the fuel supply system has one series.

In the frame treatment in the present invention, the traveling speed of the aluminum strip is detected similarly to the ordinary frame treatment, and the take-up speed, the amount of rolling oil adhered, the residual oil amount after the flame treatment (usually the contact angle with water). , Etc.),
Depending on the desired degree of annealing, the fuel supply solenoid valve (2
2) The solenoid valve (21) of the air supply system opens and closes to perform appropriate heating.

Gas or liquid fuel can be used as the fuel, but gas fuel is preferable because it is easy to control.

In the flame treatment of the present invention, the basic speed is determined for the purpose of degreasing only and for the purpose of degreasing and annealing as well. Further, the calorific value of the burner, the thickness of aluminum strip, and the rolling It depends on the type of oil and the amount of residual oil, the contact angle of the target product aluminum strip with pure water, whether it is in-line or offline, and is generally about 30 to 1.
High-speed processing of about 000 m / min is possible.

Prior to the frame treatment, the type of rolling oil adhered to the aluminum strip, the amount of rolling oil deposited, the aluminum material of the intended product aluminum strip, the mechanical strength, the thickness of the strip, and the intended aluminum strip. Since the energy supplied per area changes depending on properties such as the contact angle with water, it is preferable to measure it experimentally. A small amount of degreasing may be required when sufficient annealing is performed in another annealing step. Separately, when an aluminum strip with high mechanical strength is required, sufficient rolling oil removal is required only by flame treatment. Because.

The amount of heat supplied as a frame also varies depending on various conditions, but in general applications it is about 0.1-10.
kcal / m ² (one side), which is slightly higher than this value, especially when it is desired to increase the degreasing degree.

[0026]

When the metal strip is subjected to frame treatment for degreasing and annealing, the temperature distribution in the width (burner length) direction of the metal strip and the ejection speed of the flame are important factors.

In the conventional flame processing machine, a system in which the fuel gas containing primary air is supplied from one end of the burner is adopted, and the uniformity of the frame is changed by changing the size and shape of the burner nozzle, and changing the burner pipe system. , I went by inserting a baffle. However, depending on such means, the thickness of the metal strip, the amount of attached oil, the desired degree of annealing,
Variations in the treatment effect were unavoidable due to subtle fluctuations in the temperature distribution and the jetting speed in the length direction of the burner due to fluctuations in the fuel gas supply amount and supply pressure due to the running speed of the metal strip.

This is because it is difficult to maintain a frame of uniform strength across the width of the burner under a wide range of conditions when the fuel gas is supplied from only one of the burner length directions. Even if a uniform flame condition can be achieved under the conditions, it means that the balance is lost due to changes in the fuel gas supply rate, etc.This is the difference in local strength in the width direction of the metal strip being flame treated. It is estimated that this causes wrinkles.

However, when the fuel gas was supplied from both ends of the burner, the above problem was surprisingly solved easily. This is because the fuel gas is supplied from both ends of the burner, so the fluctuation in the balance inside the burner is smaller than in the case of single-end supply, and once the conditions for a flame of uniform strength are secured, it is widespread. It is estimated that the uniformity is maintained even when the heat value is changed according to the change in the conditions.

[0030]

[Example] As a material to be treated, a thickness of 30 μm and a width of 600 mm
Coiled aluminum foil (1N30) [contact angle with pure water 90 °, oxide film thickness 29.5Å] 50m /
Frame processing was performed at a processing speed of min. The flame treatment device used a burner width of 600 mm, propane was used as the fuel, the combustion capacity was 180,000 Kcal / hr, and the fuel containing the primary air was supplied from one end (left end) and both ends of the burner. The frame temperature is 26 points in the length direction of the burner at a point 60 mm from the burner surface, and the contact angle is 120 in the width direction of the aluminum foil.
Six points were measured at mm intervals. The oxide film thickness was also measured, but the average thickness after the treatment was 29.7Å, which did not change within the range of variation. The temperature distribution of the frame is shown in FIG. 2, and the change in contact angle with pure water is shown in Table 1.

[0031]

[Table 1]

As a result, when the fuel gas is supplied from one end, in this case, the flame temperature on the side close to the inlet is low, the contact angle with pure water is large, and variations occur.

[0033]

INDUSTRIAL APPLICABILITY According to the present invention, in degreasing a metal strip or annealing with the strip, in the frame treatment which is considered to have high uniformity and surface productivity in the width direction and the length direction of the metal strip in principle. The problematic variations in flame temperature and jet speed in the length direction of the burner are solved by supplying the burner with a fuel gas containing primary air from both ends thereof.

In this way, by supplying the fuel gas from both ends of the burner (when there are two burners, the directions are opposite to each burner), the temperature of the flame and the jet speed of the fuel gas are averaged, and the burner is simple. In addition, uniform heating is performed in the width direction of the metal strip, and degreasing and annealing can be controlled.

[Brief description of drawings]

FIG. 1 is an example of a flow of a burner, a fuel supply system, and an air supply system.

FIG. 2 shows the temperature distribution in the burner width direction.

[Explanation of symbols]

 10 Controller 11 Measurement Point 12 Fuel Gas Supply Pipe 13 Burner 21 Solenoid Valve 22 Solenoid Valve 23 Blower 24 Fuel Gas 25 Combustion Monitoring Phototube 26 Ignition Device

Claims (1)

[Claims] 1. A flame treatment, characterized in that, when degreasing or simultaneously annealing a metal strip by flame treatment, fuel gas containing primary air is previously supplied from both ends in the length direction of the burner. Fuel gas supply method for a device.