KR920004089Y1 - Facility for injecting the powder coal into the blast furnace - Google Patents

Abstract

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Description

Automatic Purging Device

1 is a schematic view for explaining the apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

T ₁ : hot junction T ₂ : cold junction

10: blowing pipe 11, 12: thermocouple alloy wire

13 divider 14 signal conversion unit

15: purge control unit 16: intake valve

17: purge seal valve 18: purge valve

The present invention relates to a blast furnace pulverized coal injection (PCI) facility for blast furnace operation, in particular, the blast furnace that can quickly detect and process the pulverized coal injection blockage in the pulverized coal transport blowing pipe installed between the PCI distributor and each blast furnace vent. The present invention relates to a pulverized coal injection pipe clogging automatic purge device.

There are 34 blown pipes in the current PCI installation.

Through these blowing pipes, the pulverized coal is blown into the blast furnace from the distributor, and when these blowing pipes are blocked, the amount of coal dust blown by about 3% per blown pipe is reduced, which leads to an increase in the coke usage cost.

This in turn raises the cost of manufacturing the molten iron.

In addition, due to the lack of heat in the direction of the clogged pipe blast circumference balance (Balance) is broken, causing the rust relief.

Another problem is that as the pulverized coal in the pipe is fixed due to the continuation of the branch pipe clogging, the forward (by the distributor side blast furnace direction) through the existing high-pressure purge air line becomes impossible, so that the connection part installed on the blast furnace vent (19) After dismantling), a separate purge air line should be used to carry out the reverse operation.

However, this reverse-penetrating operation causes many safety accidents and air pollution. In other words, when the high temperature and high-pressure gas leakage on the blast furnace side, there are risks such as human injury and fire, and also during the dismantling of the research, there is a difficulty in dispersing residual pulverized coal and working.

In particular, in the conventional case, since there is no means for detecting a clogging pipe, it is difficult to detect clogging early. Therefore, if a periodic inspection is not performed, the powdered coal clogging pipe may be clogged and a settled phenomenon. This caused an inspection error due to the error of judgment by the inspector.

The present invention is to solve the above problems, the installation of the thermocouple sensor for the detection of the clogging of the injection pipe in the injection pipe on the distributor side, detect the branch pipe clogging state from the output of this sensor to purge the pulverized coal before the coal By supplying the blast furnace, it is possible to eliminate the adverse effects of the blast furnace due to poor coal injection, to reduce the cost of molten iron, and to provide an automatic blast furnace coal clogging system to prevent pulverized coal solidification in the blowing pipe in advance. There is a purpose of design.

Hereinafter, the present invention with reference to the accompanying drawings as follows.

As shown in FIG. 1, the sensor is installed at a predetermined length between the on-contact point T ₁ attached to one side of the distributor 13 and the cold junction T ₂ buoyed on one side of the intake pipe 10. And, the detection signal of the thermocouple sensor is connected to be input to the signal conversion unit (14).

The thermocouple sensor is configured by using one wire as the alloy wire 11 of nickel, aluminum, silicon, and manganese and the other wire as the nickel and chromium alloy wire 12.

The signal conversion unit 14 is configured to amplify the detection signal of the thermocouple sensor to provide a purge signal to the purge control unit 15 when the set level or more, and the purge control unit 15 is a blow valve according to the purge signal ( 16), the purge seal valve 17 and the purge valve 18 frame is controlled so that the purge air is supplied to the blowing pipe (10).

Reference numeral 19 is a connection part, 21 is a pulverized coal manual control valve and 20 is a blast furnace.

Referring to the operation and effects of the present invention as described above are as follows.

In the accompanying drawings, once the injection pipe 10 is blocked by pulverized coal, pulverized coal transportation (usually 55 ° C.) in the distributor 13 is stopped to the blocked pipe irrespective of the position of the blockage point in the injection pipe 10. Therefore, heat transfer by pulverized coal is blocked.

Therefore, since the temperature of the blockage pipe is gradually cooled by heat exchange with the ambient temperature (usually 30 ° C.), the time elapses between the on-contact point T ₁ of the distributor 13 side and the cold contact point T ₂ of the blown-in pipe 10. As a result, temperature deviation occurs.

This temperature deviation is a cold junction between both ends of a thermocouple sensor made of a closed circuit by joining both ends of a thermocouple alloy line 19 of different metals, that is, nickel-chromium and a nickel-aluminum-silicon-manganese. Thermoelectric power is generated between T ₂ ) and the on-contact point (T ₁ ).

Therefore, during normal employment, since there is no temperature deviation between the distributor 13 and the blowing pipe 10 side, no electromotive force is generated, but once the blowing pipe 10 is blocked, the blockage pipe is blocked due to the blockage of heat transfer by pulverized coal. As the temperature decreases, the electromotive force according to the temperature deviation of the distributor 13 side and the blowing pipe 10 side increases with time.

At this time, the electromotive force is generated in units of ,, and soon this signal is input to the signal converter 14.

The signal conversion unit 14 detects a signal that the injection pipe 10 is blocked when the set value (0.25 이상) or more is provided to provide a purge signal to the purge control unit 15.

In the experiment of the present invention, it takes about 5 minutes for the electromotive force of the thermocouple sensor to reach the set value (0.25㎷) of the signal conversion unit 14, and the temperature difference between the cold junction (T ₂ ) and the hot junction (T ₁ ) is about 5 ° C.

On the other hand, when the purge signal is supplied to the purge control unit 15, the purge control unit 15 shuts off the intake valve 16 by a sequence operation and opens the purge seal valve 17 and the purge valve 18 to maintain high pressure. Run an automatic purge.

The automatic purge is performed for about one minute, after which the purge seal valve 17 and the purge valve 18 are closed, and the intake valve 16 is opened again to perform re-blowing.

When re-blowing is performed, the temperature of the branch pipe is increased by re-feeding pulverized coal and the thermocouple sensor does not generate thermoelectric power according to the elevated temperature.

As described above, the present invention uses a thermocouple sensor that detects the blockage of the branch pipe, so that it is quickly detected and automatically purged when the branch pipe is clogged. And practical effects that can solve all the problems such as risk, waste of manpower at a time can be obtained.

Claims (1)

In the pulverized coal injection pipe clogging processing apparatus, the thermocouple sensor is installed between the hot junction (T ₁ ) of the distributor 13 side and the cold junction (T ₂ ) of the injection pipe 10 side to generate an electromotive force according to the temperature difference; A signal converter 14 generating a fuzzy control signal rate when the electromotive force of the thermocouple sensor reaches a set value; And a purge controller 15 which closes the intake valve 16 and opens the purge seal valve 17 and the purge valve 18 according to the purge control signal, and supplies a forward purge error to the clogged intake pipe 10. Blast pulverized coal injection pipe clogging automatic purge device comprising a.