JPS6335332B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a hot steel billet end heating device that heats the hot steel billet end portion (edge portion) during online conveyance when hot steel billet from a continuous casting machine is directly rolled. .

Conventionally, the heating device has generally used direct heating using a burner flame or induction heating.

However, in order to keep the amount of heat transfer constant, the end of the hot steel piece is heated by the flame of the burner, or the burner is advanced or retreated depending on the width of the hot steel piece, or multiple burners are installed, and the end of the hot steel piece is heated. It is necessary to use different methods depending on the width of the image, which is not only complicated but also troublesome to operate.

Furthermore, it is difficult to uniformly heat the material, resulting in local scaling or melting damage.

Furthermore, even with the induction heating method, it is necessary to move the heater body forward or backward depending on the width of the hot steel piece, which has the disadvantage that the mechanism becomes complicated and the device itself becomes expensive.

As a result of various studies to eliminate the above-mentioned drawbacks of the conventional technology, the present invention has revealed that the radiant heat from a solid body is not greatly affected by the distance, that is, even if the width of the hot steel piece changes and the distance from the radiator changes. , which was developed based on the fact that hot steel pieces can be uniformly heated at almost the same temperature, and has a ceiling section with an exhaust port, side wall sections with burners, and a plurality of rollers. A space made of a refractory material is formed by a partition wall extending in the oven length direction at the center between each roller and a hearth part having a partition wall in the oven width direction close to the roller side parts, and the space part on both sides is A radiant wall with a large number of communicating holes divides the heating chamber into a combustion chamber with a burner and a heating chamber, and heats the end of the hot steel piece using solid radiant heat from the radiant wall while keeping the burner fixed. The aim is to provide equipment.

Next, the present invention will be explained with reference to the drawings which are one embodiment.

In the drawings, reference numeral 1 denotes a main body of a hot steel piece end heating device, which roughly consists of a ceiling portion 3a provided with an exhaust port 4, a side wall portion 3b provided with a burner 14, and a hearth portion 3c.

The outlet of the exhaust port 4 is provided with a honeycomb brick 6 that prevents heat dissipation from the exhaust port 4 during operation, and is provided with an opening/closing lid 5 that closes the exhaust port 4 during non-operation.

The hearth portion 3c of the end heating device main body 1 is divided into a hearth 8 between the conveyance rollers 13 and a hearth 7 below the conveyance rollers 13, and the hearth 8 has a central partition wall 9 in the center extending in the furnace length direction. and the conveyance roller 1
A partition wall 10 in the furnace width direction is provided adjacent to the third side,
It is detachably attached to the furnace side wall 3b.

In addition, a burner 14 is disposed on the furnace side wall 3b facing the mountain-shaped partition wall of the hearth 8, and an irregular shape is stacked in front of the burner 14 in the form of a checkerboard to form a large number of communication holes. A radiation wall 16 made of refractory bricks is provided, and a space formed by a ceiling part 3a, a side wall part 3b, and a hearth part 3c made of a refractory material is divided into a combustion chamber 15 and a heating chamber 17.

Since the end heating device main body 1 has the above configuration, when the burner 14 burns in the combustion chamber 15, the radiant wall 16 and the lining refractory material are heated by the high temperature combustion gas. In addition, the ceiling part 3 of the heating chamber 17
a, the hearth portion 3c and the central partition wall 9 are uniformly heated by the combustion gas blown out from the radiant wall 16 and the radiation from the radiant wall 16.

Therefore, while the hot steel billet W extracted from the continuous casting machine (not shown) is conveyed through the furnace by the conveyance rollers 13, the end portion thereof is also heated by the combustion gas, but is mainly heated by the radiant wall. It will be heated by radiant heat transfer from 16.

This radiation heat transfer, even if the width of the hot steel billet W changes,
There is almost no change, and the end heating characteristics can be maintained almost uniformly. According to experiments, if the heat input when the maximum width of hot steel billet W is 1650 mm is 100%,
It is 97% or more when the minimum width is 700 mm, and burner 1
4 and the radiation wall 16 are fixed, it has been found that there is no problem in actual operation in heating the end of the heated steel billet W.

Furthermore, since the radiation wall 16 is provided between the heating chamber 17 and the combustion chamber 15, high-load complete combustion (500×10 ⁴ Kcal/m ² h or more) is possible in the combustion chamber 15.
The surface temperature of the radiation wall 16 can be set to 1500°C or higher, and the radiation wall 16 itself becomes a high-temperature solid radiation surface.
The amount of heat input to the end of the hot steel piece is determined by the surface temperature of the steel piece W.
Even at 1000°C, an epoch-making value of 30×10 ⁴ Kcal/m ² h can be obtained. Furthermore, since the burner 14 performs high-temperature combustion in the divided combustion chamber 15, combustion noise is reduced and can be prevented.

As shown in the figure, if the hearth 8 is provided with chevron-shaped partition walls 9 and 10 and the center of the hot steel billet W is positioned above the center line _l1 of the radiant wall 16, the transfer roller 13 By minimizing the temperature drop of the heated steel billet W and applying radiant heat from the partition walls 9 and 10 to the lower surface of the steel billet W, the lower surface of the hot steel billet W is heated more than the upper surface, As a whole, the end portions of the hot steel billet W can be heated uniformly.
In addition, when operating intermittently, the opening/closing lid 5 is
If closed, the temperature inside the furnace will decrease less due to the heat retention effect of the honeycomb bricks 6, and the temperature rise time during the next operation can be shortened. Dissipation can be suppressed.

As is clear from the above explanation, according to the hot steel piece end heating device of the present invention, the hot steel piece end is heated mainly by the solid radiant heat of the radiant wall, which is not greatly influenced by the distance. There is no need to move the heating source according to changes in the width of the piece, and the configuration can be extremely simple. Furthermore, since the heating is performed using solid radiant heat, the heating is uniform, and unlike direct heating with a burner flame, there is an effect that partial scaling does not cause melting loss.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a hot steel piece end heating device according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. 1... Hot steel piece end heating device main body, 7, 8... Hearth, 9, 10... Partition wall, 14... Burner, 15
... Combustion chamber, 16 ... Radiation wall, 17 ... Heating chamber,
A...Space part.

Claims (1)

[Claims] 1. A ceiling section provided with an exhaust port, both side wall sections provided with burners, a partition wall having a plurality of rollers and extending in the furnace length direction in the center between each roller, and a partition in the furnace width direction close to the roller side part. A hearth portion having walls constitutes a space portion made of refractory material, and both sides of this space are partitioned into a combustion chamber having a burner and a heating chamber by beam walls having a large number of communicating holes, A hot steel piece end heating device that heats an end of the hot steel piece in the heating chamber by solid beam radiation heat from the width radiation wall.