JPH0210104Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a bell-less furnace top charging device, and particularly to the structure near the outer side of the discharge end of the chute that transfers raw materials from the pressure equalization chamber to the furnace charging inlet. By improving
This relates to a bellless furnace top charging device that removes dust that adheres and accumulates at or near the delivery end and allows smooth operation of a control gate that variably controls the amount of raw material charged. .

[Prior Art] Generally, as shown in FIG. 3, it is known that a furnace top charging device 22 such as a bellless furnace top charging device 21 is provided in the upper part of a blast furnace 20.

This furnace top charging device 22 has a pressure equalizing chamber 23 partitioned inside to prevent pressure from leaking from the blast furnace 20 and fluctuating the internal pressure of the blast furnace 20 when charging raw materials into the blast furnace 20. The raw material is charged into the blast furnace 20 while maintaining the internal pressure of the blast furnace 20 to be equal to the internal pressure of the blast furnace 20.

Conventionally, in the bellless furnace top charging device 21, a control gate 24 has been employed as a means for controlling the amount of raw material charged, and is located at section A in the figure.

FIG. 4 shows details of the above-mentioned section A.

As shown in the figure, a chute 25 is provided at the lower end of the pressure equalizing chamber 23, and this chute 25
The control gate 24 is provided at the discharge end 26 of the control gate 24 to variably control the amount of raw material charged by adjusting its opening degree. A casing 27 is provided surrounding the chute 25 containing the control gates 24 at intervals. A furnace charging port 28 is opened in the casing 27 to guide the raw material from the chute 25 to the blast furnace side.
An opening/closing seal valve 29 for opening and closing this furnace loading inlet 28 is provided. The internal pressures of the pressure equalizing chamber 23 and the blast furnace 20 are maintained using the casing 27 containing the open/close seal valves 29 as a boundary.

Therefore, the process of charging raw materials into the blast furnace 20 first involves the following steps:
After the control gate 24 and the opening/closing seal valve 29 are closed to maintain the internal pressure in the blast furnace 20, the raw material is uniformly charged into the pressure equalization chamber 23. Next, an on-off seal valve (not shown) provided at the upper end of this pressure equalization chamber 23 is closed, and the pressure equal to that of the blast furnace 20 is sealed in the pressure equalization chamber 23 . Since the temperature of the blast furnace 20 is 800℃ to 1000℃ in this sealed gas,
It is dangerous unless an inert gas is used, and carbon dioxide gas is usually drawn in from the blast furnace 20. after that,
The opening/closing seal valve 29 is opened, the charging amount is controlled by the opening degree of the control gate 24, and the raw material is carried from the chute 25 to the furnace charging inlet 28, and the raw material is charged into the blast furnace 20. is included. This raw material charging process is carried out along with the operation of the blast furnace 20.
Sequence controlled.

[Problems to be solved by the invention] By the way, this conventional bellless furnace top charging device 2
1, since the control gate 24 provided in the chute 25 does not have sealing properties,
Chute 2 including this control gate 24
5 is surrounded by a casing 27 including an open/close seal valve 29 at intervals to ensure sealing performance. This interval is necessary in relation to the operability of the control gate 24, the attachment of the chute 25, etc. However, the discharge end 26 of the chute 25
Since there was a gap between the casing 27 and the chute 25 when the raw material was transferred from the furnace to the furnace charging inlet 28, the dust 31 of the raw material was scattered and deposited in the gap.
In particular, the gas charged into the pressure equalization chamber 23 is
Due to the process, this generated gas contains water vapor, and due to its condensation,
The above raw materials become slightly moist. Therefore, the dust 31 accumulated in the space between the casing 27 and the chute 25 is mixed with this moisture and the control gate 2
The dust 31 is compacted and solidified by the opening and closing operations of 4, and the dust 31 is deposited thereon. As a result, the control gate 24 cannot be completely closed, and as described above, the opening/closing seal valve 29, which operates in conjunction with the closing operation of the control gate 24 according to the sequence, is not closed.
There was a problem in which the charging sequence came to an emergency stop and smooth operations were not possible.

Further, there is a problem in that the accumulated dust 31 falls and adheres to the seat portion 30 of the opening/closing seal valve 29, causing damage to the seat and impairing the sheet properties.

[Purpose of the invention] The present invention was created to effectively solve these problems in the conventional bellless furnace top charging device.

The purpose of the present invention is to provide a bellless furnace top charging device that can remove dust that adheres to and accumulates at or near the discharge end of a chute provided in a pressure equalization chamber during the transfer of raw materials from a pressure equalization chamber to a furnace charging inlet. It provides:

[Summary of the invention] In order to achieve the above object, the present invention provides a pressure equalizing chamber above the furnace charging inlet having an open/close seal valve, and also has a pressure equalizing chamber that faces the furnace charging inlet and supplies the raw material. A chute is provided for transferring the material to the furnace charging inlet, and a control gate is provided at the discharge end of this chute to variably control the charging amount by adjusting its opening degree, and the chute including these control gates is surrounded. In a bell-less furnace top charging device having a casing that covers from the furnace charging inlet, a dust shielding plate is provided so as to cover the outer side of the discharge end of the chute from the furnace charging inlet, and the dust shielding plate is provided with a A heater is provided to heat and dry away the dust that adheres and accumulates, and the dust shielding plate blocks the interval between the discharge end of the chute and the casing, and the dust adheres to the dust shielding plate. At the same time, the accumulated dust is heated and dried by the heater provided on the dust shielding plate, and the dried dust is removed by opening and closing the control gate. It can be removed by knocking it down.

[Example] Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an opening/closing seal valve 3 that opens and closes facing the blast furnace side is attached to the furnace charging inlet 2 of the bellless furnace top charging device 1. A pressure equalization chamber 4 is provided above the furnace inlet 2 to which the opening/closing seal valve 3 is attached. This pressure equalization chamber 4 is provided with a chute 5 for transferring raw materials from the pressure equalization chamber 4 to the furnace charging inlet 2, and this chute 5 has its discharge end 6 facing the furnace charging inlet 2. The discharge end 6 and the furnace charging inlet 2 are spaced apart from each other and are hung down at an angle. This angle of inclination is, for example, 50-60° with respect to the horizontal. As shown in FIG. 2, this chute 5 is formed, for example, in an octagonal shape,
A wear-resistant material 7 is provided on the inner circumference of the chute 5 to prevent wear of the chute 5 due to raw materials. Also,
A control gate 9 is provided at the discharge end 6 to variably control the amount of raw material charged by adjusting its opening degree in the circumferential direction about a fulcrum 8.
Shoot 5 including these control gates 9
A casing 10 that covers the furnace charging inlet 2 is provided so as to surround the furnace at a distance. Also,
A dust shielding plate 11 is provided so as to cover the outer side of the discharge end 6 of the chute 5 from the furnace loading inlet 2, and the dust shielding plate 11 has its base 12 connected to the outer edge 13 of the furnace loading inlet 2. It is fixed to the chute 5 by welding or bolts, and is erected along the inclination of the chute 5. In this embodiment, the dust shielding plate 11 covers, for example, the lower half of the chute 5 as shown in FIG. This is because raw material dust tends to adhere and accumulate on the lower half side of the chute 5. Furthermore, this dust shielding plate 11 is provided with a heater 14 for heating and drying the raw material dust that adheres and accumulates thereon. In this embodiment, the heater 14 is formed of, for example, a steam conduit 15, as shown in FIGS. The dust shielding plate 11 is successively folded back into a U-shape at both ends of the dust shielding plate 11 from above to below. This steam conduit 15 is fixed to the outer periphery of the dust shielding plate 11 with an appropriate clamp 16, etc., so that the dust shielding plate 11 is always maintained at a high temperature (approximately 100 to 120°C) by this steam conduit 15. It's getting old. As described above, the bellless furnace top charging device 1 is configured.

Next, the operation of this embodiment will be described.

As shown in FIGS. 1 and 2, the dust shielding plate 11 is disposed between the casing 10 and the chute 5, and covers the outer side of the discharge end 6 of the chute 5 from the furnace charging inlet 2. The above furnace charging inlet 2
It is provided on the outer edge portion 13 of the chute 5 in an upright manner along the chute 5. Therefore, the casing 10
The distance between the chute 5 and the chute 5 becomes smaller. Therefore, even if the raw material dust is scattered and deposited on the dust shielding plate 11 when the raw material is transferred from the discharge end 6 of the chute 5 to the furnace charging inlet 2, the accumulated thickness of this dust is becomes thinner. Further, the dust shielding plate 11 is provided with a heater 14 formed by a steam conduit 15. Therefore, the dust attached or deposited on the dust shielding plate 11 is immediately heated and dried. As described above, since the accumulated dust is becoming thinner, the dried dust becomes more likely to fall. Even if the dried dust does not naturally fall, the dried dust will be knocked down and easily removed by the opening/closing operation of the control gate 9. the result,
The control gate 9 can be smoothly opened and closed without being hindered by the accumulation of dust.

Further, even if dust falls onto the opening/closing seal valve 3, since the dust is dried, the dust will not adhere to the seat portion 17 of the opening/closing seal valve 3 and impair its sheet properties.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

By blocking the space between the discharge end of the chute and the casing with the dust shielding plate, the thickness of the dust that adheres to and accumulates on the dust shielding plate can be reduced, and the heater installed on the dust shielding plate can be Since the accumulated dust is heated and dried by the heating method, the dried dust can be easily removed by being knocked down by the opening/closing operation of the control gate. Therefore, the control gate can be opened and closed smoothly, and stable operation can be performed without causing an emergency stop of the charging sequence.

As mentioned above, even if the dust falls onto the open/close seal valve during dust removal, the dust will not adhere to the seat of the open/close seal valve because it is dry dust, and the sealing performance of the open/close seal valve will be impaired. It won't happen. Therefore, the life of the open/close seal valve can be extended.

Even if dust may accumulate near the control gate, the dust is dried by the heater installed on the dust shielding plate, so the opening and closing operations of the control gate will not compact this dust. , dust removal during wind breaks,
Cleaning can be done easily.

It is especially versatile and can be effectively used in existing equipment.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a plane sectional view of the main part taken along the line - - in Fig. 1, Fig. 3 is a schematic diagram showing the conventional example, and Fig. 4 is the A in figure 3
FIG. In the figure, 1 is a bellless furnace top charging device, 2 is a furnace charging inlet, 3 is an opening/closing seal valve, 4 is a pressure equalization chamber, 5 is a chute, 6 is an unloading end, 9 is a control gate, 1
0 is a casing, 11 is a dust shielding plate, and 14 is a heater.

Claims (1)

[Scope of utility model registration request] A pressure equalizing chamber is provided above the furnace inlet having an opening/closing seal valve, and a chute is provided in the pressure equalizing chamber to face the furnace inlet and for transferring raw materials to the furnace inlet, and the chute is carried out. There is a control at the end that variably controls the charging amount by adjusting its opening.
A bellless furnace top charging device having a casing that is provided with a gate and that surrounds a chute including these control gates and covers it from the furnace charging port,
A dust shielding plate is provided so as to cover the outer side of the discharge end of the chute from the furnace charging inlet, and a heater is provided on the dust shielding plate to heat and dry away the dust deposited on the dust shielding plate. A bellless furnace top charging device characterized by: