JPH0613248Y2 - Pressure equalizer for blast furnace swivel chute drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pressure equalizing device for a swirling chute drive unit of a bellless blast furnace having a raw material supplying swirling chute.

[Conventional technology]

At the top of the bellless blast furnace, a swirling chute for charging the raw material is arranged and a drive device for rotating the swirling chute is provided. The driving device is a rotation base that rotates together with the swirling chute. It is housed in the inner space of the swivel cone provided on the outside.

The temperature inside the furnace top of the blast furnace usually fluctuates constantly between 150 and 300 ° C, and sometimes reaches 1000 ° C during blowout. Similarly, with respect to the internal pressure of the furnace, a decrease and a return pressure are repeated as the raw material is charged, and the internal pressure of the furnace rises sharply during the blowing.
It may reach 1000 mmH ₂ O.

As described above, the high temperature and high pressure blast furnace gas flows into the inner space of the swirling cone due to the pressure difference, and as a result, the drive unit is deformed, deteriorated, and damaged by the heat and dust of the blast furnace gas that has flowed in. Was causing the problem.

Conventionally, in order to solve the above-mentioned problem, for example, by supplying N ₂ gas into the swirling cone, the swirling cone is cooled, and the N ₂ gas keeps the pressure higher than that in the blast furnace, so that inflow of the blast furnace gas occurs. Was trying to prevent.

However, usually between the rotary base and the swivel cone,
A small gap is formed to prevent interference during turning, and in order to prevent the blast furnace gas from flowing through this gap, it is necessary to constantly supply a large amount of cooling gas in anticipation of fluctuations in the furnace pressure. However, the cost was high and it was uneconomical.

Therefore, in Japanese Examined Patent Publication No. 63-30365, as shown in FIG. 3, a carbon seal 39 is provided in the gap t between the rotating cone 34 and the rotary base 36 to prevent the inflow of blast furnace gas. A sealing device is disclosed.
The device includes a bracket 3 fixed to a rotation base 36.
The carbon seal 3 is placed in the holder 38 fixed to the tip of
9 is accommodated and is placed on the sliding surface 42 by the weight 40 loaded on the upper side of the carbon seal 39 so as to have a predetermined surface pressure, and is rotated together with the rotation base 36. . The holder 38 and carbon 39
This means that the carbon 39 can move in the height direction, and the carbon seal 39 moves up and down following the irregularities of the sliding surface 42 to ensure the sealing, thereby ensuring the blast furnace gas. Try to effectively prevent the inflow.

On the other hand, in Japanese Unexamined Patent Publication No. 63-161107, as shown in FIG. 2, water channels 53 and 54 are formed along the periphery of gaps A and B where the interior of the blast furnace communicates with the inner space of the swirling cone. In addition, a pressure sensor 57 is provided to prevent the inflow of blast furnace gas as a water-sealed structure in which partition plates 55 and 56 are submerged in the water passages 53 and 54 and to keep the swirling cone internal pressure always higher than the blast furnace internal pressure. , 58, a swirling cone internal pressure adjusting mechanism for adjusting the amount of pressurized gas supplied is disclosed.

In the cooling system in this case, a water cooling panel 59 is arranged on the back side of the swivel base 52, and the water circulated and supplied to the water channel 53 passes through the water cooling panel 59, and then the water channel 54 of the B section.
It has a water-cooled structure that flows into. The water drained from the water channel 54 passes through the drain pipe 64 and is temporarily stored in the circulating water tank 60. The circulating water tank 60 and the inside of the swirling cone 51 are communicated with each other by a pressure guiding tube 63 so that the pressure is always the same. The water stored in the circulating water tank 60 is cooled by the pump 61 arranged in the middle of the supply pipe 65 on the downstream side thereof via the heat converter 62 and then supplied to the water passage 53 again.

[Problems to be solved by the device]

However, in the above Japanese Patent Publication No. 63-30365,
The carbon seal material needs to be constantly replaced due to wear and uneven wear due to foreign matter being caught, and problems remain in terms of maintenance.

On the other hand, in Japanese Patent Laid-Open No. 63-161107, the sealing structure is a water seal, and the cooling structure is also excellent in terms of structure and economy in that the circulating water of the water seal part is used. However, for example, when the pressure in the blast furnace rises sharply, the pressure adjusting mechanism by the pressurized gas supply cannot follow,
The gas in the furnace easily enters the swirling cone through the water sealing part, and as a result, dirt in the sealing water due to dust that enters with the gas and CO in the blast furnace gas are dissolved in the water, resulting in a decrease in PH and piping. This caused problems in maintenance management such as corrosion of pipes and clogging of pipes.

Therefore, the object of the present invention is to prevent the blast furnace gas from directly flowing into the swirling cone from the water seal part not only during normal operation but also during a rapid rise of the blast furnace gas, thereby improving the maintainability. Another object of the present invention is to provide a pressure equalizing device for a swiveling chute drive unit of a blast furnace, which can reduce the costs associated therewith.

[Means for Solving the Problems]

The above problem is a swirling chute for supplying raw material to the top of the blast furnace, and a rotation base that rotates together with this swirling chute,
In a swirling chute drive unit of a bellless blast furnace, which is arranged outside the rotation base and which is composed of a swirling cone for accommodating the rotation driving device of the rotation base in a space with the rotation base, The space between the swirling cone and the interior of the blast furnace communicates with a water-sealing structure, and pressure sensors for detecting pressure are provided inside the swiveling cone and inside the blast furnace, which are blocked by this water-sealing structure. Installed, and provided with a pressurized gas adjusting means for adjusting the amount of pressurized gas supplied into the swirling cone based on the pressure difference signal, and the gas from the blast furnace is substantially free inside the swirling cone. The problem can be solved by providing a pressure guiding pipe that flows into.

[Action]

In the present invention, first, the gap between the rotating base and the rotating cone has a water-sealing structure so that the blast furnace gas does not directly flow into the inner space of the rotating cone that houses the rotating chute drive device. If the fluctuation of gas pressure in the blast furnace is small, the inflow of gas can be completely sealed with only this water sealing structure, but in the blast furnace, the blast furnace pressure sometimes rises and falls rapidly. In the furnace, the gas in the furnace easily flowed in from the water sealing portion, causing various obstacles as described above. Further, even if the pressurized gas is supplied into the swirling chute as in Japanese Patent Laid-Open No. 63-161107, it is not possible to follow the rapid rise in the internal pressure of the blast furnace, and the in-furnace gas easily flows in from the water seal part. Was.

Therefore, in the present invention, pressure sensors for detecting pressure are respectively provided inside the swirling cone and the inside of the blast furnace, which are sealed by a water sealing structure, and based on the pressure difference signals between them, the swirling cone is moved into the swirling cone. In addition to providing a pressurized gas adjusting means for adjusting the amount of pressurized gas supplied, a pressure guiding pipe into which the gas from the blast furnace substantially flows is provided inside the swirling cone.

Therefore, since the blast furnace gas freely flows into the swirling cone inside the swirling cone when the pressure inside the swirling cone rapidly rises, the swirling cone internal pressure can also be instantaneously increased to follow the rapid increase in the blast furnace pressure. Even when rising, it is possible to prevent gas from flowing in from the water seal portion. As described above, the amount of pressurized gas supplied to the inside of the swirling cone is kept almost equal by the pressure guiding tube, so it is possible to significantly reduce the swirling cone internal pressure to the same level as the blast furnace internal pressure. By controlling the supply of the pressurized gas to such an extent that the pressure is slightly higher than the internal pressure of the blast furnace, it is possible to completely prevent the inflow of the internal gas from the water sealing portion.

Incidentally, the "inside the blast furnace" to which the pressure guiding pipe is connected is not limited to the inside of the blast furnace, and a portion having substantially the same pressure as the inside of the blast furnace,
For example, it can be in the exhaust duct (upflow pipe).
The slight pressure difference generated in this case may be adjusted by the pressurized gas adjusting means.

Further, since the in-furnace gas introduced by the pressure guiding tube contains dust and the like, it is desirable to introduce it through the dust removing device. Further, it is desirable to provide a check valve for closing the pressure guiding pipe in order to constantly increase the internal pressure of the swirling cone higher than that in the furnace. As a result, normally, the internal pressure is adjusted by the external pressurized gas for pressure equalization, and only when the pressure inside the furnace changes suddenly, the pressure differential pipe with a diameter larger than that of the external pressurized gas pipe temporarily holds the differential pressure. Can be replenished with internal gas.

[Specific configuration of device]

 Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIG.

At the top of the bellless blast furnace 1, a swirl chute 6 and a rotary base 3 that rotates together with the swirl chute 6 are disposed inside the swirl cone 2. A drive device (not shown) for rotating the rotation base 3 and the rotation chute 6 is housed in a space P between the rotation cone 2 and the rotation base 3.

The rotary base 3 is disposed inside the swivel cone 2 as described above. At the upper end edge and the lower end edge of the rotary base 3, the gaps A and B with the swivel cone 2 are provided in the blast furnace. It has a water-sealing structure for sealing the gas inflow.

In the water sealing structure, at the upper edge A of the rotary base 3, a concave groove 3a is formed extending from the rotary base 3, and water is supplied to the concave groove 3a to form a water channel 5. A partition plate 4 submerged in water 5 is provided so as to extend from the swivel cone 2. On the other hand, also at the lower end edge of the rotating base 3, similarly, a water sealing structure in which the edge portion 3a of the swiveling cone 3 is submerged in the water channel 7 formed by the concave groove 2a extending from the swiveling cone 2. Has become.

The cooling structure in the swivel cone 2 part includes a rotating base 3
A water cooling panel 8 is provided on the back side of the above, and has a water cooling structure using the circulating water supplied to the upper edge side water passage 5. That is, the cooling water supplied to the water channel 5 is the water cooling panel 8
After passing through, the cooling water discharged from the lower edge side water sealing portion passes through the cooling water drain pipe 9 and is temporarily stored in the circulating water tank 10. To be done. The circulating water tank 10 and the inside of the swirl cone 2 are communicated with each other by a first pressure guiding pipe 11 so that they have the same pressure. The cooling water stored in the circulating water tank 10 is cooled through a heat converter 13 by a pump 12 arranged in the middle of a cooling water supply pipe 14 on the downstream side, and then supplied to the water channel 5 again. To be done.

On the other hand, in the present invention, the rising pipe 1a of the blast furnace 1 and the inside of the swirling cone 2 are connected by the second pressure guiding pipe 20. Therefore, even when the blast furnace pressure rises rapidly,
Since the pressure inside the swirling cone 2 can be rapidly increased along with the increase in the blast furnace pressure, it is possible to prevent the blast furnace gas from entering from the water sealing portion. As described above, since the pressure difference between the blast furnace and the swirling cone can be almost instantaneously eliminated by the pressure guiding tube, the amount of pressurized gas supplied to the swirling cone 2 can be significantly reduced. The amount of pressurized gas supplied is such that it is only 5 to 10 mmH ₂ O higher than the internal pressure of the blast furnace.

In order to control the supply amount of the pressurized gas, first, the pressure sensor 1 is provided in each of the swirling cone 2 and the rising pipe 1a.
6 and 17 are provided. The values detected by the pressure sensors 16 and 17 are sent to the controller 23 via the indicators 21 and 22. In the controller 23, the supply amount of the pressurized gas is adjusted by controlling the adjusting valve 25 arranged in the middle of the pressurized gas supply pipe 24 based on the pressure difference between the pressure sensors 16 and 17.

A dust remover 18 such as a cyclone is provided in the middle of the second pressure guiding pipe 20 to remove dust mixed in the blast furnace gas, and a check valve 19 is provided to prevent leakage of the swirling cone pressure. Is provided. As the dust remover, an ordinary filter or the like can be used. In this case, however, inspection and maintenance for preventing clogging are required. Therefore, it is preferable to use a free maintenance.

In addition, as the pressurized gas, it is needless to say that N ₂ gas which is conventionally used as a cooling gas is used.
For example, a clean blast furnace gas or any other gas that does not cause a problem even if it enters (leaks) into the blast furnace can be used.

As a result of operating the bellless blast furnace having a swirling chute drive pressure equalizing device as described above, the inflow of blast furnace gas through the water sealing part was eliminated, and the contamination of the cooling water was reduced. It was only necessary to clean the waterways and pipes once a year, once a year. At the same time, when adjusting the pH of the cooling water, the amount of NaOH added for neutralization was reduced to 1/3.

Further, conventionally, while N ₂ gas supply quantity in the furnace top structure without the second connecting pipe was 1500 Nm ³ / hr, in the case of the embodiment 500 Nm ³ / hr, and the significantly supplying gas We were able to reduce the amount and save costs.

[Effect of device]

As described in detail above, according to the present invention, even when the blast furnace gas rises sharply, the inflow of gas from the water sealing part into the furnace is prevented, and maintenance cost is improved and the amount of supplied gas is greatly reduced. Can be planned.

[Brief description of drawings]

FIG. 1 is a diagram showing a pressure equalizing device for a swirling chute drive unit of a blast furnace according to the present invention, FIG. 2 is a diagram showing a pressure equalizing device for a swirling chute drive unit of a conventional blast furnace, and FIG. 3 is a swirling cone unit in a known example. It is a figure which shows the gap sealing structure of. DESCRIPTION OF SYMBOLS 1 ... Blast furnace, 2 ... Swivel cone, 3 ... Rotation base, 5 ... Upper edge side water channel, 7 ... Lower edge side water channel, 8 ... Cooling panel, 9 ... Cooling water drainage pipe, 10 ... Circulating water tank, 11 ... First pressure pipe , 12
… Pump, 13… Heat converter, 14… Cooling water supply pipe, 1
6, 17 ... Pressure sensor, 18 ... Dust remover, 19 ... Check valve, 20 ... Second pressure guiding tube 21, 22 ... Indicator, 23 ... Controller, 24 ... Pressurized gas supply tube, 25 ... Regulator valve

Claims (1)

[Scope of utility model registration request] 1. A swirling chute for supplying a raw material to the top of a blast furnace, and a rotating base which rotates together with the swirling chute.
In a swirling chute drive unit of a bellless blast furnace, which is arranged outside the rotation base and which is composed of a swirling cone for accommodating the rotation driving device of the rotation base in a space with the rotation base, The space between the swirling cone and the interior of the blast furnace communicates with a water-sealing structure, and pressure sensors for detecting pressure are provided inside the swiveling cone and inside the blast furnace, which are blocked by this water-sealing structure. Installed, and provided with a pressurized gas adjusting means for adjusting the amount of pressurized gas supplied into the swirling cone based on the pressure difference signal, and the gas from the blast furnace is substantially free inside the swirling cone. A pressure equalizing device for a blast furnace swirling chute drive unit, characterized in that a pressure guiding pipe is introduced into the blast furnace.