JPS6327635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a scrap preheating device used in an electric furnace or the like.

2. Description of the Related Art A method of preheating scrap using a container exclusively for preheating using exhaust gas generated from an electric furnace is already known.

Problems to be Solved by the Invention The conventional method has a problem in that a container and equipment dedicated to scrap preheating are required. Furthermore, in the case of a special container which does not have a special function as in the present invention, if the preheating temperature of the scrap is raised to a high temperature, the special container becomes deformed and becomes unusable. Therefore, there is a problem in that the preheating temperature of the scrap cannot be raised sufficiently, and as a result, it cannot sufficiently contribute to reducing the amount of electricity used in the electric furnace in the next step, shortening the melting time, etc.

The present invention has been made in view of the above points, and the first object thereof is that the charging bucket itself has the function of a preheating container. Second, the scrap temperature must be preheated to a high temperature of 500℃ or higher, and the charging bucket must not be deformed by heat. Thirdly, there is provided a scrap preheating device which is provided with a duct capable of supplying exhaust gas capable of preheating scrap to a high temperature and a connection portion that prevents leakage of the exhaust gas.

Means for Solving the Problems The present invention has a cooling water supply/drainage port with guide holes 22 on the left and right sides to be installed before the start of scrap preheating and removed after the preheating is completed, and a cooling water channel for circulating the cooling water. A bucket truck consisting of a portable bucket for charging, a gas discharge port for placing the bucket, and a preheating tank is covered with a hood having a sliding pipe directly connected to the gas supply port, while the main duct and the duct are In order to connect a horizontal duct whose entire circumference is covered by casters and a first damper provided in the duct to the sliding pipe, and to connect a discharge port provided in the bucket truck to a discharge duct having a second damper. This is a scrap preheating device consisting of:

Function In the scrap preheating operation using the device of the present invention, exhaust gas of 600°C or more generated from the electric furnace is supplied to the main duct 16 with the third damper 24 closed, and is passed through the horizontal duct 18 to the first damper 17. The scrap is charged into a transportable charging bucket 14 through a hood 11 from a supply port 10 with the door open, and the scrap is preheated to a high temperature of 500°C or higher.

Before starting scrap preheating, a cooling water supply and drainage port is attached to the flange having guide holes 22 on the left and right,
The inner periphery of the bucket is forcibly cooled by constantly supplying circulating cooling water at a rate of 200 to 1000/min to the portable bucket for charging during preheating. After the scrap preheating is completed, the cooling water supply and drainage ports are removed from the flanges having the guide holes 22 on the left and right sides. Therefore, even when high-temperature exhaust gas is used, there is no thermal deformation of the portable charging bucket.

In this state, the preheated exhaust gas passes through the exhaust port 5, opens the second damper 19, and exits the exhaust duct 2.
1 to the dust collector. When not performing scrap preheating, close the first and second dampers and close the third damper.
The damper is opened to discharge the exhaust gas generated from the electric furnace to the dust collector. In addition, after the scrap preheating is completed, the portable charging bucket and the cooling water supply and drainage ports provided on the flanges with guide holes 22 on the left and right sides are removed, so there is no rubber hose for water supply and drainage, making it easy to transport the portable charging bucket. is not restricted at all.

Embodiment An embodiment of the present invention will be described below based on the drawings.

Water supply and drainage ports 1 and 3 are provided on the flange, which has guide holes 22 on the left and right sides, which have a mechanism that is installed before the start of scrap preheating and removed after the scrap is completed, and the water supply and drainage ports are connected to a portable bucket for charging with a rubber hose, A portable bucket container 4 for charging is constructed by providing an opening 1 and a cooling channel 2 connected to the water supply port around the entire circumference from the top to the bottom of the bucket and connected to a drain port 3, and the bucket container 4 is placed thereon. A bucket truck 7 having a gas outlet 5 and a preheating tank 6 for
It becomes more. The trolley 7 is on a track 8 and is moved in a direction parallel to the duct (indicated by the arrow) to load scrap at another location and then returned to the position shown to preheat the scrap.

On the other hand, the exhaust gas supply port 10 connected to the sliding pipe 9 is fixed to the hood 11, and its outer surface is completely covered with casters to prevent heat radiation of the exhaust gas.

Furthermore, there is a seal part 1 on the circumference of the upper part of the preheating tank.
2, a bucket skirt part 23 is placed on the seal part to prevent leakage of exhaust gas, and the hood 11 is placed over this state.

Furthermore, a sliding device 20 is provided to connect the first damper 17 and the sliding pipe 9 to prevent leakage of high-temperature exhaust gas.

Next, the track 8' is attached to the top of the column 13 fixed to the foundation.
The pillars are arranged in parallel to be orthogonal to the duct, and the garter 14 is constructed on top of the pillars.

The garter 14 is provided with a hanging device such as a chain 15 that suspends the hood 11 and has the function of raising and lowering the hood 11 and moving it horizontally. The hood suspended by the garter also has the function of being moved onto other preheating tanks by the lateral movement of the garter.

On the other hand, the horizontal duct 18, which is directly connected to the main duct 16 and has a first damper 17 at the other end, has the function of covering the outer surface with casters to prevent exhaust gas supply and heat radiation, and is connected to the above-mentioned sliding pipe 9. let

Similarly, a bucket truck 7 having a discharge port 5 is connected to a second damper 19 provided at the other end of the discharge duct 21, forming a series of exhaust gas circuits and serving as a scrap preheating device.

Effects of the Invention The present invention prevents leakage of exhaust gas by completely covering the duct with casters and strengthening the connections between the first damper and the hood, the hood and the bucket, and the bucket and the preheating tank. Furthermore, the synergistic effect of using a portable charging bucket with a special cooling function prevents heat dissipation and leakage of the exhaust gas temperature, and in addition, the high temperature exhaust gas can be used for scrap preheating, reducing the scrap preheating temperature. By ensuring a temperature of 500°C or higher, we were able to achieve effects that were previously unachievable, such as reducing the power consumption of the electric furnace in the next process and shortening the melting time. Furthermore, after the preheating of the scrap is completed, the water supply and drainage system (dotted line in Figure 4) is removed from the portable charging bucket, so there is no need to worry about the rubber hoses used for cooling getting in the way when transporting the bucket.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of the scrap preheating device according to the present invention, Fig. 2 is a partial side view of a portable charging bucket, Fig. 3 is a front view of the same figure, and Fig. 4 is the same as that of Fig. 2. It is a figure of one embodiment in which a water supply and drainage device is attached to a portable bucket for charging. In the diagram, 1... Water supply port, 2... Cooling channel, 3...
Drain port, 4...Portable bucket for charging, 5...Discharge port, 6...Preheating tank, 7...Bucket trolley, 1
0... Supply port, 11... Hood, 16... Main duct, 17... First damper, 18... Horizontal duct, 19... Second damper, 21... Discharge duct, 22... Guide hole.

Claims (1)

[Claims] 1 A portable bucket for charging which has a cooling water supply/drainage port on the flange which has guide holes 22 on the left and right, which can be attached before the start of scrap preheating and removed after the preheating is completed, and a cooling water channel for circulating the cooling water. ,
A movable bucket cart consisting of a gas discharge port and a preheating tank is covered with a hood having a sliding pipe directly connected to the gas supply port, and a hood with a sliding pipe directly connected to the main duct and the entire circumference directly connected to the duct A horizontal duct covered with casters and a first damper provided on the duct are connected to the sliding pipe, and a discharge port provided on the bucket truck is connected to a discharge duct having a second damper. Scrap preheating device.