JPS5825729B2 - Honetsou Chitsuki Kanetsuro - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a heating furnace for steel, and more particularly to a heating furnace with a heat retaining device.

Since the casting from the continuous casting machine is cooled before reaching the molding machine, such as a rolling mill, it is first heated through a heating furnace to a temperature suitable for rolling and then continuously supplied to the rolling mill.

In this operation, if the supply capacity of castings is greater than the processing capacity of the rolling mill, a heat storage device is usually provided in front of the heating furnace to store the castings corresponding to the difference in capacity so as not to interfere with continuous operation.

Conventional continuous operation will be explained based on FIG. 4. A cast material 43 as a material to be heated is conveyed from a continuous casting machine 41 by a charging roller table 42 and is heated to a predetermined temperature while moving within a heating furnace 44. , are continuously supplied to a rolling mill 46 by an extraction roller table 45.

In addition, the cast material 43 corresponding to the difference in capacity is temporarily stored in a heat storage device 47, and is maintained at a constant temperature so that the humidity does not drop during this storage, and when the supply from the continuous casting machine 41 to the heating furnace 44 is stopped. It is taken out and conveyed to the heating furnace 44 by the charging roller table 42.

In this way, the heat retaining device 47 plays an important role in enabling continuous operation from casting to rolling, but on the other hand, the heating furnace 4
Since a heat source separate from 4 is required, the overall fuel cost tends to be high.

To avoid this, for example, the heated material 43 of the heating furnace 44
A flue 50 is provided from the charging side 48 to one end 49 of the heat retaining device 47, and the flue 50 guides the combustion exhaust gas in the heating furnace 44 into the heat retaining device 47, and from the other end 51 to the chimney. A method of discharging the gas has also been proposed, but in this method, the negative pressure becomes large near the chimney due to the exhaust gas attraction characteristics of the chimney, and the furnace pressure on the extraction side 52 of the heating furnace 44 is controlled to ±Omw H20. If so, the heat retention device 47
The inside of the heat retainer 47 becomes more than 10m1H20, and this large negative pressure causes cold air to be sucked in from the loading and unloading ports of the heat retaining device 47, significantly impeding the heat retaining effect and worsening the temperature distribution within the heat retaining device. It becomes difficult to uniformly heat the heated material 43.

In addition, in the conventional device shown in the drawings, since the charging roller table 42 between the heat retaining device 47 and the heating furnace 44 is exposed to the outside, the heated material is The material 43 is likely to naturally cool down, and there is a risk that the thermal energy spent on the heat retaining device 47 will be wasted.

The present invention aims to provide a heat retaining device-added heating furnace that does not have the above-mentioned drawbacks and has excellent thermal efficiency, and will be described below with reference to the drawings.

In Figs. 1 and 2, 1 is a heating furnace, 2 is a heat retaining device, and both are connected with a gas-resistant structure by a connecting part 3, and hot gas distribution is evenly distributed from the top of both by a flue 4. −
The structure is such that it can be carried out smoothly.

Reference numeral 5 denotes a charging roller table, and this table 5 is electrically connected to the heat retaining device 2 and one end side 6, 7 of the heating furnace 1 through a connecting portion 3 from a continuous casting machine (not shown).

Reference numeral 8 denotes an extraction roller table that is externally installed on the opposite end side 9 of the heating furnace 1 and led to the rolling mill (not shown); Recuperator-1 is a furnace pressure control damper and chimney.

In the above configuration, the casting from the continuous casting machine, that is, the heated material 14 (held temperature approximately 800 to 850°) is passed through the heat retaining device 2 and the connecting portion 3 by the charging roller table 5 to one end side in the heating furnace 1. 7, where it is continuously moved by the furnace pusher 15 to the opposite end 9.

Combustion gas is blown into the inside of the heating furnace 1 by any means, and the temperature is set so that the temperature suitable for rolling, for example, about 1200 to 1250° C., is reached by the time the heated material 14 moves to the opposite end side 9.

The material to be heated 1 that has been heated in this way and moved to the opposite end side 9
4 is continuously extracted by an extraction roller table 8 and supplied to a rolling mill.

In such a supply system, the processing capacity of the rolling mill does not reach the supply capacity of the continuous casting machine, and for example, the former has 60 doors/% and the latter has 9 doors/%.
If it is 0 tons/hour, the material to be heated 14 whose capacity difference between the two is 30 tons/hour is temporarily stored in the heat retaining device 2.

This storage is performed by a positioning pusher 16 provided at one end 6 of the heat retaining device 2 and a walking beam device 17 within the heat retaining device 2, for example.

The high-temperature combustion exhaust gas in the heating furnace 1 is passed through the heat retaining device 2 from the connection part 3 and the flue 4, and the heated material 14 stored with this exhaust gas is kept at a constant temperature, for example, about 800 to 850℃.
Keep at 0℃.

When the supply of the material to be heated 14 from the continuous casting machine to the heating furnace 1 is stopped, the material to be heated 14 stored in the heat retaining device 2 is sequentially loaded from one end side 6 by the reverse movement of the walking beam device 17. It is placed on the input roller table 5 and introduced into the heating furnace 1 through the connecting part 3, where it is continuously heated and extracted in the same manner as described above.

The high-temperature combustion exhaust gas flowing from the heating furnace 1 into the heat retention device 2 is used for heat retention of the heated material 14, and then passed through the recuperator.
10 and the furnace pressure control damper 11 to be discharged from the chimney 12 to the outside.

FIG. 3 shows another example, in which the heat retaining device 2 is arranged at the folded position in FIG. The distribution etc. are carried out in the same manner as described above.

FIG. 5 shows still another example, in which the material to be heated 14 supplied from the continuous casting machine is first introduced into one end side 7 of the heating furnace 1 by the charging roller table 5, and then the heat retaining device 2
It is arranged so that it is introduced into one end side 6 of the.

As described above, the present invention connects the heat retaining device to the heating furnace in a gas-resistant structure, and stores the combustion exhaust gas used in the heating furnace uniformly and smoothly through the above-mentioned connection part and the flue communicating with the upper side. The material to be heated, which is guided into the heating device and stored, is maintained at a constant temperature by the exhaust gas, and the roller table for charging the material to be heated is built into the heat retention device and the inside of the heating furnace, making it possible to connect the material with a gas-resistant structure. Since the heat retaining device communicates through the heat retaining device, there are fewer or no openings, which prevents the temperature from dropping due to cold air intake or natural cooling, and allows the material to be heated to be heated with good thermal efficiency. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one example of the heat retaining device-added heat furnace of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Figs. 3 and 5 are sectional views showing other examples. , FIG. 4 is a schematic plan view for explaining a conventional heat retaining device and heating furnace. 1... Heating furnace, 2... Heat retention device, 3.
... Connection part, 4 ... Flue (upper communication part), 5 ... Charging roller table (conveying device)
, 12... Chimney (exhaust gas port), 14...
・Heated material.

Claims (1)

[Claims] 1. The heat retention device and the heating furnace are connected by a connection part made of a gas-resistant structure, and a conveying device for transporting the material to be heated through the connection part is provided in the connection part, the heat retention part, and the heating part, and
A heating furnace with a heat retaining device, in which the heat retaining device and the heating furnace are communicated with each other through a communication portion made of a gas-resistant structure separate from the above-mentioned connection portion above these, and an exhaust gas port is provided on the heat retaining device side.