JPS61136636A - Cooling and drying apparatus for continuous annealing apparatus of strip - Google Patents

Abstract

PURPOSE:To make production of dry temper material possible using continuous annealing apparatus, by providing a water dip tank, etc., held to a prescribed temp. between a continuous annealing furnace and a temper rolling mill and dissolving strip temp. elevation and cooling unevenness. CONSTITUTION:The titled apparatus is composed by providing the water dip tank 30 for cooling a strip 1, a water removing apparatus 34 and a strip dryer 35 between the continuous annealing furnace 2 and the temper rolling mill 10. The apparatus 34 removes water adhered at the surface of the strip 1 in the tank 30. The tank 30 is held to <=40 deg.C temp. of drainage by adjusting the water supply quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to (i) cooling and drying for a continuous annealing apparatus for IJ tubes; improvements in St;

[Conventional technology]

An in-line temper rolling mill (hereinafter referred to as pressure regulating machine) installed at the outlet of the continuous annealing furnace for copper strip (hereinafter referred to as strip) does not reduce the mechanical performance of the steel strip.
The temperature of the strip during temper rolling must be kept below 40°C. Since the temperature of the strip discharged at the outlet of a continuous annealing furnace is usually 100 to 150°C, this temperature must be lowered to 40°C or less in order to apply it to a pressure regulator.

For this reason, after the strip leaves the annealing furnace, it is cooled by passing through a water tank, and after draining with high-pressure air blowing or 1J Ngarol, etc., it is applied to a pressure regulator, or after it leaves the water tank, it is left in a wet state for the first time. The pressure was applied to the pressure regulator until '1. However, in either case, the drying of the strip is insufficient, so the use of continuous annealing equipment has been limited to the operation of wet number materials, which are rolled using pressure regulating oil in the pressure regulating machine.

However, recently there has been an increase in demand for dry number materials that do not use pressure regulating oil, and it has become necessary to subject dry number materials to continuous annealing. To deal with this, the space in front of the pressure regulator inlet must be
The II whelk must have a dry surface and the temperature must be below 40°C. In the case of patch annealing, there is sufficient time between the annealing process and the pressure adjustment process, during which time the strip is cooled to room temperature and dry numbering is also possible. However, in the case of continuous annealing, the time from annealing to pressure adjustment is short;
The water must be cooled and dried within this short period of time. Figure 6 shows an example of a conventional facility in which a hot air drying device was installed on a trial basis after the water tank, and drying was attempted. In the figure +IIFi
strip, (2) is a continuous annealing furnace, (3) is a water tank, (4
) is a hot air dryer, (5) is an air heater, (61) fi
Steam or furnace combustion gas, (7) is a blower, (8) is outside air,
(9) is hot air, the bag is a pressure regulator, the housing is an oil applicator, and a21 is a tension reel. 100~ from continuous annealing furnace (2)
The strip (1) that came out at a temperature of 150℃ is placed in a water tank (3)
After being cooled, it is dried in hot air dryer # (4). The hot air drying device (4) converts the outside air (8) sent by the blower (7) into steam or furnace combustion exhaust gas (6) in the air heater (5).
) and sprays hot air (9) at 90 to 100° C. onto the strip “1” to heat and dry it.

Methods other than water cooling and hot air for cooling and drying the IJ tube (1) include the gas jet method shown in FIG. 7, the roll cooling method shown in FIG. 8, and the gas jet method shown in FIG. There are combination methods such as a type and a roll cooling type.

First, the gas jet type has a first jet cooler a9 that injects and cools the strip (1) using a 13 ft outside air blower (141), and a gas cooler (161) that cools the outside air (13) to create cold air (17) at 15°C. This cold air αn is injected onto the blower a81<Yoshistrip (1) and the strip (
1) and a second jet cooler α1 for cooling the first jet cooler α1.
Strip at outlet of jet cooler α9 (1) (F) f
75°C, that of the second jet cooler 90°C
This is what we are trying to do.

Next, in the roll cooling type, as shown in Figure 8, the cold water cooled by Water Cooler Co., Ltd. is supplied to the inside of each water-cooled roll Qυ of the water-cooled cooler ■, and by this water-cooled roll Qυ, The purpose is to lower the temperature of the strip (1) in contact with the surface of the water-cooled roll (21>).

The cold water (23) is circulated by a pump.

Furthermore, in the combined system of the gas jet system and roll cooling system shown in Fig. 9, the aforementioned jet cooler a9 and water-cooled roll type cooler ■ are arranged in series as shown in the figure, thereby cooling the strip (II). With a strip (
The temperature in 1) is 90° C. at the outlet of jet cooler α4 and 40° C. at the outlet of water-cooled roll cooler (2).

[Problem that the invention seeks to solve]

As mentioned above, various types of equipment have been considered for cooling and drying the strip at 100 to 150°C after leaving the continuous annealing furnace in front of a pressure regulator, but each of them has the following problems. ing.

The method of drying with a hot air dryer is that the temperature of the hot air (9) in 41 was too high, so
Even if the length of strip (1) is shortened, the temperature of strip (1) remains 50℃.
As a result of the above, the dry number conditions could not be met and the use of the product had to be discontinued. When using hot air, it was necessary to suppress the temperature rise of the strip (1) in a short dry zone, and there was no suitable method for highly accurate non-contact temperature measurement, making it difficult to control the amount of hot air. be.

The next gas jet type cools the strip (1) from the furnace with air, which increases the number of passes, and also requires equipment such as a gas cooler a, which increases the equipment cost.

In addition, condensation may form on the surface of the strip (1). In the water-cooled roll method, it is difficult to make uniform contact between the strip (II) and the water-cooled roll Qυ, which may cause uneven cooling of the strip. In addition, there are many water-cooled rolls. In addition to using a water cooler, an expensive refrigerator is also required, which increases the equipment cost.

Also, the combination of a jet type and a water-cooled roll type has the disadvantage that it requires a large amount of equipment cost for a jet cooler or a water-cooled roll type cooler (2G).

The present invention has been made to solve the above-mentioned problems of the conventional apparatus, and aims to provide an efficient strip cooling drying apparatus with low equipment cost.

[Means for solving problems]

In order to achieve the above-mentioned purpose, a quarter dip tank is installed between the continuous annealing furnace and the pressure regulator, which is configured so that the water supply temperature can be controlled at a constant level by adjusting the water supply, and water adhering to the surface of the strip is removed. A strip cooling and drying device called a strip dryer and a strip dryer were installed to dry the strip. Note that the above U-tube dryer works together with an air heater and a hot air injection header, and the hot air heated to a temperature slightly higher than the outside air temperature by the air heater is transferred to the hot air injection header. Configured to spray onto a surface.

[For production]

The strip at 100-150°C leaving the continuous annealing furnace is first cooled to about 40°C in a quarter dip tank.

The water temperature of the tank can be adjusted by adjusting the amount of water supplied.
It is controlled so that the temperature does not exceed 0°C. The strip, from which the water adhering to the surface has been removed to a level of approximately one inch, is then applied to a strip dryer by a draining device installed after the tank. The air injected onto the strip by the strip dryer is heated to a temperature of 40 to 50° C., which is slightly higher than the outside air, and therefore its relative humidity is considerably lower than that of the outside air. This dry air is used to evaporate and dry the water remaining on the surface of the lip.
The length of the dryer varies depending on the temperature and therefore the relative humidity of the injected air.

A specific example will be explained below. Temperature 60℃, relative humidity 8
When heating the outside air of 096 to 45℃ and blowing it, 45
The relative humidity at °C decreases to 35.1 °C. Temperature 30
The absolute humidity H2 at ℃ and relative humidity of 80 degrees is 0.022
kg-"a/kg-dry air, and the saturated absolute humidity Hw of air at 45℃ is α062""5Ag-dry
It is air. In addition, the heat transfer force due to jet flow is 80'/i
hr, C, the mass transfer coefficient km is approximately 310 kl
//, B, Tonashi, the evaporation rate B when the above-mentioned injected air is 45° C. and absolute humidity α022Y-H5g/kli-dry air is expressed by the following equation.

Rw kHX (H'9F") ,, 310x (0,062-0,022)-1
2,4 sand - 1h If you inject at 60℃80S, 30℃(7)
Air Ote5s absolute humidity is 0.027kg-H snow”kl
iF -dr)ra1r't' Arca et It -1,
55 cg/m'hrt), heating to 15° C. increases the evaporation rate by eight times, which is inversely proportional to the length of the drying zone.

Fig. 5 shows a strip dryer f2i according to the present invention installed in continuous annealing equipment for IJ tubes with a processing capacity of 100 t/h.
The required drying length when using I is calculated based on the following calculation conditions, and the results are displayed on a graph.1. & is a thing.

Calculation conditions are usually used for dryer design.Adhesive water amount: 1g seam, Value line speed: 180mpm Plate width: 130o ■ Jet heat transfer $80'/w? h°C In the same graph, when the actual ls#i injection temperature is 40°C, the broken line is the value when it is 45°C. Outside temperature 30℃, relative humidity 80
m, it can be seen that the required drying length is 9.5 m when the outside air is heated to 40 t:, and 5 m when it is heated to 45°C.

Note that the IJ tube dryer is equipped with a small-capacity air heater for hot air, and is configured so that the zero heat temperature of the air in the air heater can be changed as appropriate depending on the temperature of the outside air.

S) The temperature of the hot air injected into the IJ knob is a little higher than the outside temperature, so if the female length of the dryer is longer than the drying distance, there is a risk that the temperature of the IJ knob will rise. The extent of this is extremely small; when using hot air at 45°C, the temperature rise in the strip during a path length of 20 m is about 0.6°C. Furthermore, during drying, the strip is cooled by the latent heat of evaporation, so even if the length of the bath is 40 m, the temperature rise in the S) U lug during that time will be less than 1°C.0 A temperature rise of this magnitude is completely unacceptable to the pressure regulator. Not a problem. By controlling the water temperature in the water dip tank, low-temperature drying at even lower temperatures is also possible.

[Embodiments of the invention]

FIG. 1 is a block diagram showing a practical example of the present invention, and FIG. 2 is a front view. In the figure, (1) is a strip, 12) is a continuous annealing furnace, (to) is a water dip tank, G is a pump, (
(to) is water supply, (to) is drainage, (to) is water supply, (to) is 04 is ring roll, (to) is) I7 Tsug dryer, (to) is air injection header, (b) is air heater, (to) is blower, (to) is furnace Melting exhaust gas, hot air for trout, pressure regulator for kiln, and tension reel for (2).・ As shown in the figure, the strip at a temperature of 150℃ comes out of the continuous annealing furnace (II#: t, water dip tank (to)
Inside, it is cooled by water supplied from the pump 09 button, and the temperature drops to 40C. In addition, there is the water dizzta mentioned above. Next, the water on the surface of the strip (1) is removed with a ring roll (b) to about 1 gV-, and then the strip is placed in a strip dryer (b). The strip dryer (2) uses hot air heated from an outside temperature of 60°C to 45°C using an air heater (b) that uses furnace combustion exhaust gas (2) as a heat source.
This is a device that sprays hot air onto the surface of the hot air jet header) to dry the surface of the strip (1) of the strip (1).
While passing through, water adhering to the surface is evaporated and removed while maintaining the temperature of 40°C. Figure 3 (a) e (b
) and Figure 4 (&) are a front view and side view showing the hot air injection header (to), which has a hole or slit in the steel pipe as shown in the figure. It is a good idea to set up and form it. In the strip dryer (to),
A large number of these headers are arranged on both sides of the strip (1).

The strip (1) is outputted from the strip dryer (2).
The material is placed in a pressure regulator at a temperature of 40.degree. C. with the surface dry, and then made into a coil using a tension reel (2).

In the above example, a ringer roll (b) is used as the draining device, but an air knife or the like using a high-pressure air jet may also be used.

Further, steam or other heat source may be used instead of the furnace combustion exhaust gas (2) as the heat source of the air heater (b).

〔Effect of the invention〕

In the present invention, a water dip tank, a water draining device, and a strip dryer are installed after the continuous annealing furnace, and the strip at 100 to 150°C exiting the annealing furnace is water-cooled, water drained, and then the temperature rises by about 10°C from the outside air. Since drying is performed using a strip dryer that sprays heated hot air, it becomes possible to produce dry tensa material, which was conventionally batch annealed, using continuous annealing equipment.

(2) Compared to conventional hot air drying methods, rising hot air and uneven cooling can be eliminated.

(31 Equipment costs will be significantly reduced.

You can achieve great effects such as:

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a front view thereof, FIGS. 3 and 4 are front and side views of two types of hot air injection headers of a strip dryer, and FIG. FIG. 5 is a diagram showing the relationship between outside air conditions and drying length. Also, Fig. 6 is a block diagram of a conventional hot air drying device, and tl/E7, Fig. 8, and Fig. 9 are diagrams of a conventional gas jet method, a water-cooled roll method, and a combination of a jet method and a water-cooled cool method, respectively. FIG. In the figure, (1) is +7p, (2) is a continuous annealing furnace, ■
is the water dip tank, 02 is its water supply, (to) is its drainage, (b) is the draining device, (to) is the strip dryer, (to) is the hot air jet header, (b) is the air heater, and is the hot air. , aO? This is an Ajx rolling mill. Agent Patent Attorney Sanro Kimura 5 Figure Tato Kito (1st arc IIL Suya, 121
) Q Self-I Nail I-Ten 4L Guj (''C) Fig. 6

Claims (3)

[Claims] (1) In a continuous strip annealing apparatus having an in-line temper rolling mill, between the continuous annealing furnace and the temper rolling mill,
A continuous annealing device for strips, comprising a water dip tank for cooling the strips, a draining device for removing water adhering to the surface of the strips, and a strip dryer for drying the strips. Cooling drying equipment. (2) Continuous annealing of the strip according to claim 1, wherein the water dip tank is configured to maintain the temperature of the waste water at 40°C or less by adjusting the amount of water supplied. Cooling and drying equipment for equipment. (3) an air heater for the strip dryer to heat outside air and create warm air whose temperature is slightly higher than the outside air temperature;
Claims characterized by comprising a plurality of hot air injection headers formed by drilling a large number of holes or slits in a steel pipe for injecting the hot air onto the surface of the strip, piping, etc. A cooling drying device for a continuous annealing device for strips according to item 1.