JPS62214111A - Cooling installation for furnace top charger - Google Patents

Abstract

PURPOSE:To reduce the length of a piping for cooling gas passage and to clean up the cooling gas by connecting the bottom plate of a machine chamber for swiveling a chute at the top of a blast furnace body and casing provided with an inlet and outlet by a gas shut-off device and providing a cooler, fan and pressure regulating valve to the gas circulation path between the above-mentioned inlet and outlet. CONSTITUTION:The chute 2 for charging raw materials is swiveled or tilted by the apparatus in the machine chamber 3 so that the raw materials are thrown into the furnace body 1. The chamber 3 is delineated and formed of a freely rotatable bottom plate 4 which partitions the chamber 3 and the furnace body 1 and the casing 5 which is provided on the furnace body 1. The bottom plate 4 and the casing 5 are connected by the gas shut-off device 7. The chamber 3 is kept heated by the blast furnace gas ascending from the furnace body 1. The gas in the chamber 3 is cooled by the cooler 16 of the circulation path 15 from the outlet 11 and is supplied through the fan 18, etc., to the inlet 12. The gas is returned as the cooling gas into the chamber 3 to prevent the heating up of the respective apparatus in said chamber. The gas is again circulated in the above-mentioned manner. The pressure of the cooling gas to be supplied into the chamber 3 is regulated by the regulator 19.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a furnace top charging device for a vertical furnace, and particularly for cooling a machine room in which a raw material charging chute at the top of the furnace body is rotated. This relates to the cooling equipment for the top charging device of the furnace.

[Prior Art] Conventionally, a vertical furnace such as a blast furnace is provided with a chute for charging raw materials into the furnace body, and a machine room for rotating the chute is formed at the top of the furnace body. ing.

This machine room is protected from the high temperatures inside the furnace. It is cooled down as much as possible.

The cooling equipment of a conventional furnace top charging device will be explained with reference to FIG.

In FIG. 4, a is a furnace body, and a raw material charging chute is provided at the top of the furnace body a so as to be rotatable within the furnace body a.
A machine room C for operating the chute b in a rotating and tilting manner is formed at the top of the furnace on its outer periphery.

Machine room C is divided by bottom plate d and casing e.

To cool the machine room C, the blast furnace gas is purified through the dust remover f1 venturi scrubber 9, and is branched from the venturi scrubber 9 on the way from the venturi scrubber 〇 to the other blast furnace gas utilization equipment supply system, so that the gas is semi-cleaned. The cleaned gas is supplied to the miniben≠Uly scrubber j through piping i for cleaning, and the cleaned gas is sent to the machine room C via the mist separator (through piping m) using a water ring compressor.
It supplies and cools the water.

Water is supplied to the mini venturi scrubber j and the water ring compressor k through a water pipe n, and after the purified gas is cooled by the water, the mist is removed by a mist separator β and becomes cooling gas, which is passed through the pipe m. It is supplied to the machine room C via.

There is a gap δ1 between the bottom plate d of the machine room C and the casing 0. δ
2 is formed so that the gas introduced into the machine room C and after cooling the equipment in the machine room C is blown out into the furnace body a through gaps δ1 and δ2.

[Problems to be Solved by the Invention] However, in order to partially branch off the blast furnace gas taken out after the venturi scrubber 9 of the dust remover f1 and send it to the machine room C through a water ring compressor, the piping i.

m becomes longer. In other words, the dust remover F11, Venture Scrubber 1, Water Ring Compressor, etc. are installed above ground, and on the other hand,
Since the machine room C is located at the top of the furnace, the piping i9m thereof is long, and the longer piping length increases pressure loss, causing a problem of increasing the size of the water ring compressor k.

In addition, the semi-clean gas is cleaned using a mini venturi scrubber J, but the cleaned gas contains fine dust, and when this is introduced into the machine room C, it adheres to the gear surfaces of the equipment and damages the teeth. This will have a negative effect on surface wear.

The present invention has been made in consideration of the above circumstances, and provides cooling equipment for a furnace top charging device that requires only a short length of piping for flowing cooling gas and that does not contain dust or the like in the cooling gas. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a machine room in which a raw material charging chute is rotatably provided at the top of the furnace body, and the chute is rotatably moved at the top of the furnace body. In the furnace top charging device formed by forming a machine room and covering the machine room with a rotatable bottom plate and a casing, the bottom plate of the machine room and the casing are connected by a gas cutoff device, and a cooling gas inlet/outlet is provided in the casing. A gas cooler, a blower, and a gas pressure regulating valve are connected to the circulation path from the outlet to the inlet.

[Function] In the cooling equipment of the furnace top charging device of the present invention, since the gas in the machine room is circulated in the circulation path, dust is not contained in the cooling gas, and the cooling gas is repeatedly passed through the gas cooler. Because it cools and circulates, the equipment can be made smaller, installed near the top of the furnace, and the length of the piping can be shortened.

[Embodiment] Hereinafter, a preferred embodiment of the cooling equipment for the furnace top charging device according to the present invention will be described based on the accompanying drawings.

Fig. 1 shows an overall view of the cooling equipment of the furnace top charging device of the present invention. A service chute 2 is provided so as to be swingable and tiltable, and a machine room 3 for rotating and tilting the chute 2 is formed on the furnace body 1 on the outer periphery of the chute 2. The machine room 3 is partitioned by a rotatable bottom plate 4 that partitions the machine room 3 and the inside of the furnace body 1, and a casing 5 provided on the furnace body 1, and has a pressure equalization chamber (not shown) in the center. An opening 6 is formed for supplying the raw material from the pressure equalizing chamber to the raw material charging chute 2, and the raw material is supplied from the pressure equalizing chamber to the chute 2 through a guide pipe (not shown) or the like.

The chute 2 is connected to the guide pipe or bottom plate 4, and is rotated and tilted by equipment in the machine room 3, so that raw materials can be uniformly introduced into the furnace body 1.

The bottom plate 4 and the casing 5 are connected by a gas cutoff device 7. That is, for example, as shown in the figure, an annular water seal tank 8 is formed in the bottom plate 4 on the side of the opening 6, and the inner wall 5a of the casing 5 is immersed in the water seal tank 8 to form an inner gas cutoff device 7a. An annular water seal tank 9 is provided on the outer circumferential side of the casing 5.
is formed, and the outer peripheral wall 4b of the bottom plate 4 is immersed in the water seal tank 9 to form the outer gas cutoff device 7b.

The bottom plate 4 is connected to the casing 5 by a thrust bearing plate 1°.

-〇- The casing 5 is provided with an outlet 11 for gas in the machine room 3 and an inlet 12, and the outlet 11 and the inlet 1
2 are connected by pipes 13 and 14 to form a circulation path 15. A gas cooler 16, a balance tank 17, and a blower 18 are connected to this circulation path 15 in this order from the outlet 11 side.

A gas pressure adjustment device 19 that adjusts the pressure of cooling gas supplied into the machine room 3 is connected to a pipe 14 extending from the blower 18 to the inlet 12 .

The gas pressure regulator 19 includes a relief valve 20 that releases the discharged gas from the blower 18 into the atmosphere or into the furnace body 1, and a return valve 21 that returns the discharged gas to the balance tank 17.

A cooling gas temperature measuring device 22 is connected to the inlet 12 side,
The amount of cooling water in the cooling water pipe 16a of the gas cooler 16 is adjusted based on the detected temperature. A gas replenishment device 23 for cooling gas such as N2 gas is connected to the balance tank 17.

The pressure inside the machine room 3 and the furnace body 1 is measured by a machine room differential pressure measuring device 24.
The pressure on the discharge side and the suction side of the blower 18 is detected by a differential pressure measuring device 25 for blowing air, and these differential pressure measuring devices 24 and 25 are connected to one gas pressure regulating device, that is, the relief valve 20. and the return valve 21 is controlled.

Next, the operation of this embodiment will be explained.

The raw material charging chute 2 is rotated or operated in W4 mode by the equipment in the machine room 3, and the raw material is charged into the furnace body 1.

At this time, the machine room 3 is heated by the blast furnace gas rising from the furnace body 1 through the opening 6.

The gas in the machine room 3 passes through the circulation path 15 from the outlet 13, is cooled by the gas cooler 16, is supplied from the balance tank 17 to the inlet 12 via the blower 18, is returned to the machine room 3 as cooling gas, and is then cooled by the gas cooler 16. This prevents the temperature of each device from rising, and the equipment is cooled and circulated again as described above.

In this case, the machine room differential pressure measuring device 24 detects the pressure difference between the machine room 3 and the furnace body 1, and sets the pressure in the machine room 3 to be slightly higher than that in the furnace so that gas in the furnace does not enter the machine room 3. The opening degrees of the relief valve 20 and the return valve 21 are controlled so that. That is, if the pressure difference between the machine room 3 and the furnace is the set pressure difference, both valves 20 and 21 are kept closed, and if the pressure difference is slightly higher than the set pressure difference, the opening degree of the return valve 21 is controlled. The capacity of the blower 18 is adjusted, and if the pressure difference is higher than the set pressure difference, the relief valve 20 is opened and the cooling gas is released from the circulation path 15.

Further, the blowing pressure measuring device 25 controls the opening degree of the return valve 21 and adjusts its blowing capacity.

If the pressure drops due to a leak of cooling gas from the machine room 3 or the circulation path 15, the machine room differential pressure measuring device 24
is below the set differential pressure value, and controls the gas replenishing device 23 to replenish the balance tank 17 with cooling gas. Further, the balance tank 17 prevents the suction side pressure of the blower 18 from becoming an excessively negative pressure and causing the gas pressure to become unbalanced when the valves 20.21 are opened and closed.

As the cooling gas for cooling the machine room 3, a clean gas such as N2 gas is used so as not to adversely affect the equipment in the machine room 3.

Figures 2 and 3 show the bottom plate 4 and the mobile tank 5 in the present invention.
FIG. 2 shows an example of a gas cutoff device 7 that connects the bottom plate 4 and the casing 5. In FIG. Further, the gas cutoff device 7 shown in FIG. It is designed so that it escapes to the furnace body 1 side.

[Effects of the Invention] As is clear from the detailed description above, the present invention exhibits the following excellent effects.

(1) Connect the bottom plate that partitions the machine room and the casing with a gas cutoff device, provide an inlet and outlet for cooling gas in the casing, connect a cooling gas circulation path, and cool the gas from the outlet. Since the dust is circulated to the machine room, dust can be prevented from entering the machine room, and the equipment in the machine room can be operated stably.

(2) Since the gas in the machine room is cooled and circulated, the equipment can be downsized and installed near the furnace top charging device, so the piping length can be shortened and costs can be reduced.

(3) Since the piping length can be shortened, there is less pressure loss and the blower can be made smaller.

[Brief explanation of drawings]

FIG. 1 is an overall view showing one embodiment of the cooling equipment of the furnace top charging device of the present invention, FIGS. 2 and 3 are sectional views showing an example of the gas cutoff device of the present invention, and FIG. The figure shows a conventional example. In the figure, 1 is a furnace body, 2 is a raw material charging chute, 3 is a machine room, 4 is a bottom plate, 5 is a casing, 7 is a gas cutoff device, 11
12 is an inlet, 15 is a circulation path, 16 is a gas cooler, 18 is a blower, and 19 is a gas pressure regulator.

Claims (1)

[Claims] A furnace top charging system in which a material charging chute is rotatably provided at the top of the furnace body, a machine room for rotating the chute is formed at the top of the furnace body, and the machine room is covered with a rotatable bottom plate and a casing. In the device, the bottom plate of the machine room and the casing are connected by a gas cutoff device, a cooling gas inlet/outlet is provided in the casing, and a gas cooler, a blower, and a gas pressure adjustment device are connected to the circulation path from the outlet to the inlet. Cooling equipment for furnace top charging equipment.