KR20030052521A - Apparatus for adding mist to the cooler of sintered ore - Google Patents

Abstract

PURPOSE: An apparatus for adding mist to a sintered ore cooler is provided to improve cooling efficiency of sintered ore by installing a mist adding device at a lower portion of the sintered ore cooler through utilizing air flow blown from the sintered ore cooler. CONSTITUTION: A mist adding apparatus includes a cooling water pipe(34) for receiving cooling water, an air pipe(15) for receiving air, and a mist spraying device for spraying mist. The cooling water pipe(34) has a plurality of branched water pipes(44), which upwardly extend from the cooling water pipe body. The air pipe(15) has a plurality of branched air pipes(15), which upwardly extend from the cooling pipe body. The branched water pipes(44) of the cooling water pipe(34) are communicated with the branched air pipe(35) so as to form mist. A mist spraying nozzle(45) is formed at an upper end of the branched air pipe(35).

Description

Sintered ore cooler mist adder {APPARATUS FOR ADDING MIST TO THE COOLER OF SINTERED ORE}

The present invention relates to a cooling apparatus for cooling by blowing air at room temperature into the sintered ore manufactured in the sintering machine, and more particularly, by adding mist to the cooling air generated in the blower and spraying the sintered ore at the bottom of the cooling bogie It relates to a mist adding device for improving the.

In general, the sintered ore used in the blast furnace of the steel mill is manufactured as a compacted sintered ore by mixing and assembling the powdered iron ore and powdered coke. In this process, when the blended raw material is charged into the sintering machine to sinter the sintered ore, the vertical segregation of the particle size is induced. The larger particle size is charged to the lower layer of the sintering machine, and the smaller particle size is charged to the upper layer of the sintering machine. Sintered ore is manufactured by the process of ignition and suction in the downward direction. Therefore, in the process of firing the sintered ore, the blended raw material and the powdered coke are burned and melted to form a compacted sintered ore. When the light is distributed in the sintering machine, the red light layer is distributed in the state of about 1/3 of the total thickness. .

Therefore, the temperature at which the sintered ore is discharged to the cooler becomes light distribution at about 800 to 1000 ° C. and is loaded into the cooler. The sintered ore loaded on the cooler is cooled by exchanging heat with the sintered ore which is glowing while forcibly blowing cooling air into the air duct from the cooling fan and discharging the cooling air upward of the cooler bogie.

Therefore, since the air supplied to the conventional sintered ore cooler is advanced by a simple method of raising and blowing air in the cooling fan in the cooling fan, the cooling efficiency decreases due to the temperature increase of the atmospheric air in summer. As a result of the second spraying cooling operation using water due to the decrease in the cooling capacity of the cooler, the following problems were derived.

First, since the air supplied to the cooler is made by forcibly blowing air by boosting atmospheric air, in the summer, as the upper portion of the cooler bogie increases in density due to high temperature, the flow of air decreases and the cooling capacity rapidly decreases. there is a problem.

Second, the emission of red light is more frequent, which increases the risk of fire in the transport belt. That is, as the sintered ore is discharged to the transport belt without being completely cooled, the material of the transport belt hardens due to local damage of the belt and heat load, and thus the bonding strength of the joint decreases, resulting in frequent breakage and fire accidents of the belt. It is happening.

Third, secondary water spray cooling is performed to prevent facility accidents. In other words, when the sintered ore is discharged in a state in which heat is not exchanged by the cooling air, sprinkling cooling is carried out using water on the cooler bogie to prevent belt fires and loss accidents. It is happening. Therefore, when sprinkling cooling is performed using water on the manufactured high-temperature sintered ore, fine cracks are generated in the melt-bonded sintered ore structure due to the rapid cooling phenomenon, so that a differentiation phenomenon is easily broken even under a weak impact, resulting in a decrease in strength and a large fraction. An adverse effect occurs.

In addition, as shown in FIG. 2 during the cooling of the sprinkling water, a section 11 in which water is stagnant occurs, and clogging of the screen tree of the particle size sorter in the course of passing the particle size sorter of the nature treatment facility when the sintered ore in the state containing water is passed. A phenomenon occurs and the particle size sorting rate is lowered. As a result, a phenomenon that the chute for processing the sintered ore of each facility is clogged frequently occurs.

Fourth, the performance of the dust collector is degraded to pollute the environment. Since the sintered ore is particle sized with a large amount of water, moisture is introduced into the dust collector which collects the dust generated at this time, and fine dust is stuck together with moisture in the internal parts of the dust collector, resulting in deterioration of dust collector performance and consequently Pollution occurs frequently.

The present invention is to solve the above problems, by using a device for adding a mist in the lower portion of the cooler grizzly bar using the flow of air forcedly blown in the sintered ore cooler, thereby improving the cooling efficiency of the sintered ore, red light The purpose is to prevent emissions.

Moreover, an object of this invention is to prevent the pollution of an environment and to prevent an accident of a facility by providing such an apparatus.

1 is a plan view showing a general sintered ore cooling bogie.

Figure 2 is a side view showing a watering device of a conventional sintered ore cooler.

3 is a configuration diagram showing the configuration of the mist adding apparatus according to the present invention.

4 is a state diagram showing the arrangement of the mist adding apparatus according to the present invention.

5 is an operational state diagram of the mist adding apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Chiller Bogie 2: Charging Unit

3: outlet portion 5: cooling fan

10: Grizzly Bar 13: Air Duct

14: mist adding device 15: air piping

34: cooling water pipe 35: air pipe

44: water pipe 45: jet nozzle

As a constituent means for achieving the above object, the present invention is a sintered ore cooling bogie for cooling the sintered ore manufactured while moving along a circular orbit, comprising a plurality of water reservoirs extending toward the top, the cooling water is supplied Cooling water pipe; And a plurality of air pipes extending toward the upper portion, wherein the air pipes are supplied with air, wherein the water pipes of the cooling water pipes communicate with the air pipes of the air pipes to form a mist. Mist injection nozzle for injecting the mist is formed at the upper end, and is provided in the lower portion of the cooling bogie to provide a mist adding device for injecting the mist between the grigiri bar.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 3 is a configuration diagram showing the configuration of the mist adding apparatus according to the present invention. 4 is a state diagram showing the arrangement of the mist adding apparatus according to the present invention.

As shown in FIG. 3, the mist adding device 14 according to the present invention includes a cooling water pipe 34 and an air pipe 15. The cooling water pipe 34 and the air pipe 15 have a length enough to be mounted on the lower portion of the bogie, and are arranged adjacent to each other in parallel. Cooling water pipe 34 is a cooling water supply is formed with a plurality of branch pipes 44 extending toward the top. About 20 of the branch pipes 44 are typically disposed. In addition, the air pipe 15 flows through the atmosphere, and a plurality of branch pipes 35 extending upward are formed on the upper portion of the air pipe 15. The air pipe 35 and the water pipe 44 are formed to have an inner diameter smaller than the air supply pipe 15 and the cooling water pipe 34.

The branch pipes formed on each of the cooling water pipe 34 and the air pipe 15 are combined into one. That is, the air pipe 35 is combined to communicate with the water pipe 44. Therefore, the cooling water is combined with the air injected through the air pipe 35 to form a mist including fine water molecules, which are injected by the mist injection nozzle 45 formed on the air pipe 35.

3 and 4, such a mist adding device 14 is equipped with a solenoid valve 21 for controlling the supply of air and cooling water on one side, such a solenoid valve 21 is a control box ( CONTROL BOX). The control box is connected to a temperature sensor 27 for sensing the temperature of the lower portion of the cooling cart. In addition, as shown in FIG. 4, the mist adding device 14 is arranged in the lower part of the trolley | bogie at a predetermined space | interval, Preferably, three are arranged by the space | interval of 3m.

As shown in FIG. 1, the trolley 1 is circular and has a plurality of compartments, and is sintered at the discharge section 3 through a cooling fan 5 into which cooling air is introduced by rotating from the sintered ore charging section 2. It is to be discharged, the mist adding device according to the present invention is preferably mounted between the temperature sensing unit 27 installed from the cooling fan (5) to the discharge unit (3). Grizzlyba 10 is mounted to the lower portion of the trolley 1, and the mist is sprayed to the lower portion of the sintered ore through the Grizzlyba 10.

The operation of the mist adding device according to the present invention as described above with reference to the drawings as follows. 5 is an operational state diagram of the mist adding apparatus according to the present invention.

As shown in FIG. 5, the mist adding apparatus according to the present invention is mounted to the bottom of the trolley 1 by about 1 m, and sprays mist onto the sintered ore 16 located on the grizzly bar 10. The mist is injected into the sintered ore cooler 1 in the state where the sintered ore has a latent heat of 800 to 1000 ° C., and is charged into the sintered ore cooling bogie 1, and blows air into the air duct 13 from the cooling fan 5. When forced cooling, when the value detected by the thermometer 17 in the temperature sensing unit 27 is 200 ℃ or more, the injection operation. That is, when the temperature detection unit sends a detection signal to the control box as described above, the mist is injected from the mist adding device 14 by applying the operation signal of the solenoid valve 21. Air is supplied from the air duct 13, and the internal air pressure is 30mb or more, so there is no air flow in a certain section, but as the air flows upward, the air flows faster to form a mist.

Mist sprayed from the mist adding apparatus is sprayed in the form of a complete mist, and primarily cools the atmospheric air and flows between the grizzly bars 10 at the lower portion of the bogie so that water molecules are adsorbed to the sintered ore, thereby improving cooling efficiency. Therefore, the discharge of the sintered ore in the glowing state is prevented, it is possible to prevent the fire of the transport belt and accidents of the installation.

Table 1 and Table 2 below compare the working conditions before use and the case using the mist adding device according to the present invention.

Before improvement After improvement 1 month (for 3 months total) Average 1 month (for 3 months total) Average Sinterer Stops 7 8 5 6.6 One One 3 1.6 Screen cleaning count 8 11 8 9 2 2 3 2.3

Before improvement After improvement 1 month (for 3 months total) Average 1 month (for 3 months total) Average Sintered Productivity (T / D / m ² ) 34.9 35.6 35.7 35.4 36 36.7 35.6 36.1 Bridge temperature 80 79.5 79 79.5 78 78.5 79 59.7 Hopper temperature 61 60 58.1 59.7 47.7 48.5 49.5 48.6

As shown in Table 1, it can be seen that the sintering machine stop time due to the red light of the cooler is significantly reduced compared to before the improvement. In addition, the number of screen cleaning was reduced from 9 to 2.3 times a month.

In addition, as shown in Table 2, the temperature of the discharge hopper of the cooler and the temperature of the bridge also decreased significantly, and it can be seen that the sintering productivity was slightly increased.

As described above, according to the present invention, by spraying and spraying mist into the sintered ore cooling device, the cooling efficiency of the sintered ore can be improved, the post process screen efficiency can be improved, and the quality and productivity of the sintered ore can be improved.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (4)

In the sintered ore cooling bogie for cooling the sintered ore manufactured while moving along a circular orbit, A cooling water pipe including a plurality of water pipes extending toward the upper side and supplied with cooling water; And It includes a plurality of air pipes extending toward the upper, the air pipe is supplied air; The water pipe of the cooling water pipe communicates with the air pipe of the air pipe to form a mist, and a mist injection nozzle for injecting the mist is formed at an upper end of the air pipe, and is mounted on the lower portion of the cooling bogie. A mist adding device that sprays mist through the ribs. According to claim 1, wherein the water pipe and the air pipe is a mist adding device, characterized in that the inner diameter of the pipe is smaller than the cooling water pipe and the air pipe. The mist adding apparatus according to claim 1, wherein the mist adding apparatus is arranged at a predetermined interval at a lower portion of the cooling bogie, and each mist adding apparatus comprises 20 nozzles. 2. The mist adding apparatus according to claim 1, wherein a lower portion of said cooling bogie is equipped with a temperature sensing unit in front of said mist adding apparatus, and is driven when the temperature of the temperature sensing unit is 200 deg.