KR920008677B1 - Method and device for searching the blocking of tyuere and pci lance - Google Patents

Abstract

(1) setting detection apparatus with sensor using a photo transistor on the peep hole of the tuyere. (2) detecting clogging of the tuyere and the fine coal blowing lance by continuous voltage signal acording to the bridghtness change of light inside the tuyere. The major parts of this apparatus are connector (10), sensor (31), reflection mirror (33), detection part (50), PCI lance (120), and peeping hole (150).

Description

Pre-detection method and device for clogging blast furnace vent and pulverized coal injection (PCI LANCE)

1 is a view showing a state in which a detection sensor of the present invention is mounted on an exit port.

2A is a circuit diagram of a detection sensor, and FIG. 2B is a graph showing a change in output value of the detection sensor according to a change in luminance.

3 is a graph showing the operation situation according to the change in the brightness of the inside of the tuyere.

4 is an explanatory diagram showing a windshield monitoring method and a pulverized coal injection system according to the prior art.

* Explanation of symbols for main parts of the drawings

10: connector 20: body

31 sensor 33 reflection glass

50: check unit 130: windball

150: observation port

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for early detection of clogging of the Lignite coal pulverization (PCI LANCE), which is frequently generated in the pulverized coal (PCI) operation of steel mills, and a detection apparatus used therein.

First, looking at the pulverized coal injection system, as shown in FIG. 4, the pulverized coal is transferred from the pulverized coal distributor 100 through the injection pipe 110 by the compressed air, and the pulverized coal injection lance 120 is blown 130. One side of the gun is to spray the pulverized coal into the blast furnace 140 inside.

At this time, the operator periodically monitors the blowing state through the observation hole (150) formed in the tuyere 130, if clogging phenomenon of the tuyere and pulverized coal injection lance occurs, using the existing purge air line 160 Manually purge the pulverized coal injection lance 120 or stop the pulverized coal injection work to perform maintenance work.

As described above, as a prior art for monitoring the blockage of the tuyere and pulverized coal blown lance, the clogging by using a primitive method of detecting the blocked state by the worker periodically observes the interior of the tuyere 130 through the observation port 150. Since the phenomenon cannot be detected at an early stage, therefore, the pulverized coal injection lance 120 must be lowered and the pulverized coal employment lance 120 is dismantled and penetrated because the pulverized coal is fixed in the blowing pipe so that it cannot be penetrated immediately. ) After dismantling the union, the air line is installed and penetrated to penetrate it, so there is a high risk of safety accidents such as high temperature and high pressure gas leaking to the outside. Residual pulverized coal in the branch pipe 110 has been scattered to the atmosphere, which has greatly worsened the air pollution and working environment. In order to solve this disadvantage, Utility Model Registration Application No. 89-20630 of December 29, 1989 proposed an automatic purge device for pulverized coal injection pipe clogging. The above technique forms a closed circuit by joining both ends of different metals, and uses a thermoelectric thermometer that generates thermoelectric power in proportion to the temperature difference between the two contacts. When the blown pipe 110 is blocked by pulverized coal, the coal dust distributor ( By using the temperature difference between the 100 and the inlet pipe 110, the blockage of the pulverized coal injection lance 120 can be detected and automatically purged.

However, in this apparatus, the detection response time takes about 5 minutes, so that it is difficult to momentarily catch the blockage prediction and blockage phenomenon of the pulverized coal injection lance, and thus, it is difficult to automatically purge at a proper time, and continuous air hole monitoring is not possible.

The present invention has been made to solve the above problems, it is possible to detect the clogging of the windball and pulverized coal blown lance early to purge the pulverized coal blown lance at the appropriate time and to continuously monitor the internal state of the windball. It is an object of the present invention to provide a method and apparatus for detecting blast furnace openings and pulverized coal injection lances.

In order to achieve the above object, the present invention comprises the steps of installing a detection device equipped with a sensor (SENSOR) using a transistor (PHOTO TRANSISTOR) in the observation sphere of the wind ball; Generating a continuous voltage signal according to a change in brightness of light generated in the tuyere from the detection apparatus to detect the clogging phenomenon of the tuyere and pulverized coal injection lance early; Hollow body portion is fixed integrally on one side of the observation port through the connector (CONNECTOR); A sensor fixing part inserted into the body and equipped with a sensor using a phototransistor; A hollow check part positioned on the body part and provided with a check window and formed with a lid; By fixing a plurality of bolts on one side of the body portion, the lead wire drawn out from the sensor through the center is provided to provide a blast furnace pulverized coal injection lance pre-blocking detection device including a cover formed to be drawn out.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a detector (1) of the present invention is integrally coupled to the observation port 150 formed in the tuyere 130 via the connector 10.

The detection device 1 has a hollow body portion 20, a sensor fixing portion 30 is provided with a sensor 31 using a phototransistor (PHOTO TRANSISTOR) in the body portion 20, the sensor Conductor 32 for drawing the voltage generated from the 31 to the outside is drawn out through the center of the cover 40 fixed to a plurality of bolts (not shown) on one side of the body portion 20. In the center of the upper surface 2a of the body portion 20, a hole 20b having a predetermined size is formed, and an inner space 50a of the hollow inspection portion 50 installed on the upper portion of the body portion 20. Communicating. The sensor fixing part 30 is formed with an inclined surface 30a of a predetermined angle on one side thereof so that the reflective glass 33 is integrally fixed, and a through hole 30b of a predetermined size is formed in the center thereof so that the sensor 31 is formed. Is inserted, the sensor circuit board 34 integrally coupled with the sensor 31 is fixed to the sensor fixing part 30 in the space (30c) of a predetermined size formed on the other side with a plurality of bolts 35 have. In addition, the sensor fixing part 30 is firmly fixed to the inside of the body part 20 using a key 36, and a plurality of conductive wires 32 connected to the sensor circuit board 33 are connected to the body part ( It penetrates through the center of the cover 40 formed in the other side of 20), and is drawn out. The inspection unit 50 is provided with a space (50a) formed inside the expansion end (Step) (50b) of a predetermined size is fixed to the inspection window 51 and the upper surface one side of the lid (52) through the split pin (52) ( 53 is rotatably coupled. Reference numeral 180 is a conventional inspection window.

The operation and effects of the detection device 1 of the present invention configured as described above will be described.

When the light generated during the combustion of pulverized coal in the blast furnace enters the sensor fixing part 30 through the observation port 150, the light is reflected at right angles to the reflective glass 33 fixed to the sensor fixing part 30 to check the inspection unit ( Diffracted into the inspection window 51 of 50). Therefore, the operator can open the lid 53 of the inspection unit 50 and visually observe the state of light change inside the blast furnace through the inspection window 51. On the other hand, the sensor 31 installed in the sensor fixing part 30 is equipped with a sensor circuit board 34 as shown in Figure 2a in the section C and E according to the brightness of the light flowing through the observation port 150 When a voltage change is generated and matched to an external voltage, a voltage signal is generated and signal correction is performed through the stabilization circuit 34a to emit an appropriate signal, and emit a warning sound or a warning light according to the signal. By turning on, the blockage phenomenon can be detected immediately.

FIG. 2B is a graph showing the operating characteristics of the sensor 31. It can be seen that the output value of the sensor changes as the luminance LUX changes. Hereinafter, referring to FIG. 3, the operation situation change in the blast furnace according to the change in luminance inside the tuyere 130 will be described in more detail.

When the normal operation is made in the tuyere 130 of the blast furnace 140, as can be seen in the P ＂portion, will have a 4500-6000LUX value. However, if the clogging occurs, the change in the light inside the opening is rapidly changed and changes to more than 8000LUX as in the Q 'section, and when the pulverized coal injection lance 120 is blocked, the luminance of less than 2000LUX as the' R 'section. It can be easily seen that the deviation from the normal operating state significantly. In the case of anti-melting mud and live light fall, the brightness of 5000-7000LUX such as ＂S＂ and the change of brightness such as ＂T＂ and ＂U＂ are generated in case of deterioration and rising trend, respectively. Judgment will also be possible.

In addition, the fine coal supply stop level (X) and the lance purge level (Y) are set for the Q Q region indicating the clogging phenomenon and the R R region showing the fine coal injection lance clogging phenomenon. It is also possible to prevent the blown lance clogging phenomenon early.

In addition, the condensation phenomenon generated due to the temperature difference between the outside air is removed from the inside of the inspection window 180 formed in the observation port 150, so that the inside of the air vent 130 may be easily observed.

Therefore, according to the present invention, it is possible to accurately and quickly monitor the conditions of the blast furnace in accordance with the change in the brightness, so that airflow clogging phenomenon and clogging phenomenon of pulverized coal injection lance can be detected early and prevented, and the airflow by pulverized coal backflow is prevented. It is possible to prevent large-scale equipment accidents such as clogging of branch pipes and to obtain accurate information on aging and heat determination, thereby significantly improving the productivity of the blast furnace.

Claims (2)

In the method for detecting the clogging of the air vent inside the blast furnace or the pulverization of coal dust injection, a detection device (1) having a sensor (31) using a phototransistor (PHOTO TRANSISTOR) mounted on the observation port (150) of the vent (130). And a continuous voltage signal generated according to a change in brightness of light generated in the tuyere 130 from the detection device 1 to detect clogging of the tuyere 130 and the pulverized coal injection lance 120 at an early stage. Blast furnace blowhole and pulverized coal blown lance pre-clogging detection method comprising the step of. In the detection device for detecting the clogging of the air vent in the blast furnace or clogged pulverized coal lance clogging phenomenon, the hollow body portion 20 which is integrally fixed to one side of the observation port 150 via the connector 10; A sensor fixing part 30 inserted into the body 20 and provided with a sensor 31 using a phototransistor; A hollow inspection unit 50 positioned above the body portion 20 and provided with an inspection window 51 and a lid 53 formed thereon; It characterized in that it comprises a cover 40 is fixed to one side of the body portion 20 via a plurality of bolts and the lead wire 32 drawn out from the sensor 31 is formed to be drawn through the center to the outside Pre-clogging detection device for blast furnace blast fine coal injection lance.