KR100928828B1 - Sintered ore cooling method - Google Patents

Abstract

There is provided a sintered ore cooling method for cooling the sintered ore used as a raw material in the blast furnace making process.

The sintered ore cooling method may include: a first cooling step of cooling and sintering ore by supplying and spraying cold air and mist from a lower part of a cooler bogie cooling the sintered ore; And, if the surface temperature of the sintered ore is higher than the sintered ore discharge temperature, the secondary cooling step of further cooling the red portion of the sintered ore by supplying and spraying cold air and cooling water spray from the top of the cooler; And supplying the hot air generated in the first and second cooling steps to the boiler to use heat of the hot air.

According to the present invention, cooling is supplied in the lower and upper portions of the sinter cooler and sprayed mist and cooling water spray in the first and second stages together with cold air supply, thereby effectively cooling in the minute sintered ore having poor ventilation and cooling. While preventing damage to the sintered ore transport equipment due to defects, by supplying and recycling the hot air generated in the first and second cooling stages to the boiler, it is possible to obtain an improved effect of improving the energy utilization efficiency.

Description

Sintered ore cooling method {METHOD FOR COOLING SINTER}

1 is a schematic view showing a conventional sintered ore cooling process

FIG. 2 is a schematic plan view showing the charged state of the divided sintered or opposing sintered ore in the cooler in the conventional sintered ore cooling process.

Figure 3 is a schematic diagram for explaining the sintered ore cooling process according to the present invention

Explanation of symbols on the main parts of the drawings

10 ... infrared temperature sensor 20 ... mist nozzle

30 .... Spray Nozzle 100 .... Cooler

102 .... cooler bogie 110 .... exhaust

120 .... Sintered ore 120a .... Opposite sintered ore

120b .... min sintered ore

A .... alliance sintered ore main cooling zone

B .... min sinter ore main cooling zone

C .... Boiler Supply Zone of Hot Air

The present invention relates to a sintered ore cooling method for cooling the sintered ore used as a raw material in the blast furnace making process, and more specifically, the mist and cooling water divided into the first and second, with the cold air supply in the lower and upper parts of the sinter cooler By spraying spray, cooling is effectively performed in the minutely sintered ore with poor ventilation to prevent damage to the sintered ore transport equipment due to poor cooling, while supplying the hot air generated in the first and second cooling stages to the boiler. The present invention relates to a sintered ore cooling method capable of improving energy use efficiency by recycling.

The sintered ore used as raw material in the blast furnace making process is to mix iron ore and coal and then burn coal and sinter the iron ore with the heat of combustion. Since it is about -1000 ° C, in order to transport such a high temperature sintered ore to a belt conveyor, which is a transportation facility, the temperature must be cooled to 100 ° C or less, and FIG. 1 illustrates a conventional cooling process of the sintered ore.

That is, FIG. 1 shows a schematic view of a sinter cooler 100 that is a sintered ore cooling facility. The sintered ore 120 distributed in the sintered bogie on the exhaust 110 is about 4 m in width through the crushing facility 130. And loaded onto the trolley 102 in the sintered cooler 100 having a height of about 2 m, at which time the trolley 102 of the cooler 100 is about 0.8-1.5 m / min, although not shown in the drawings. As the speed of, it proceeds along a circular rail with a diameter of about 40m.                         

On the other hand, as shown in Figure 1, the crushed sintered ore 120 through the crushing equipment 130 is divided into an opposing sintered ore (120a) and divided sintered ore (120b), respectively, the potential and the rear charging chute (connected to the cooler) It is loaded on the cooler bogie through 140a) 140b.

Therefore, in FIG. 2, the sintered ore 120 charged in the cooler 100 is illustrated in a plan view. There is a region where only the opposing sintered ore 120a and the divided sintered ore 120b are stacked. In this case, the split ore 120b is formed. Since the air permeability is very low in the region of, the cold air blown through the blower pipes 150a and 150b connected to the cooler 100 hardly passes through the divided sintered ore 120b layer to cool the sintered ore 120 substantially. It is easy to maintain state.

That is, in order to cool the high temperature sintered ore 120 charged in the trolley 102 of the cooler 100, the lower temperature of the sintered cooler 100, through the blower pipe (150a, 150b) connected to the two blowers, room temperature Air from the bottom of the bogie to the top at a rate of 1 to 2 m / s.

Accordingly, the temperature of the sintered light 140 during light distribution in the sintering equipment is 800-1000 ° C., but is cooled at a temperature of about 100 ° C. at the end of the sinter cooler 100 and is transported through a belt conveyor that is a transport facility.

At this time. Reference numeral 160 in the drawings is a boiler.

However, as shown in FIG. 1, in the conventional sintered ore cooling method, the output of the sintered ore 120 is increased, the residence time of the sintered cooler 100 is short, or the sintered ore 120 discharged from the sintered bogie. ) Is too high due to misoperation of the sintering process, the sintered ore 120 is not sufficiently cooled in the cooler 100, and maintains a high temperature of approximately 150-200 ° C. at the end of the sinter cooler 100. Emissions can lead to serious equipment accidents that damage the belt conveyor, which is the sintered ore transport facility, or, in severe cases, cause the conveyor belt to fire.

On the other hand, a number of techniques for solving the above problems are known. First, in Korean Unexamined Patent Publication No. 2001-59583, measuring the temperature of the sintered ore upper air for each width direction section of the K-type thermocouple above a certain temperature A sintered ore cooling method is disclosed in which cooling water is injected to only a portion corresponding to a rise to cool the sintered ore.

However, the sintered ore cooling method disclosed in the above publication, by using the K-type thermocouple to measure the temperature of the upper air of the sintered ore, there is a problem that does not measure the surface temperature of the actual sintered ore, for example, opposing and split sintered ore (120a) Although the air temperature measured in the upper K-type thermocouple of the upper part of the 120b is 200 ° C and 300 ° C, the actual surface temperature of each sintered ore is 250 ° C and 450 ° C. This is severe, because the breathability is weak in the divided sintered ore (120b) region.

Therefore, a problem occurs because the temperature of the divided sintered ore 120b among the sintered ores in which the actual cold wind does not pass smoothly is high, and the technique disclosed in the above publication has a problem in that the temperature control of the sintered ore is not accurately performed.

Next, another conventional sintered ore cooling method is disclosed in Japanese Patent Laid-Open No. 63-7341, which is a method of cooling the sintered ore by misting the water heated in the longitudinal direction of the sintered cooler and spraying it from the top. .

However, in the sintered ore cooling method as described above, the air permeability is poor in the region where the divided sintered ore 120b is accumulated, and thus there is a problem that the cooling wind cannot pass and there is little cooling efficiency even in the mist. Moreover, since mist is generated using the heated water in the boiler shown by 160 of FIG. 1, energy efficiency is reduced by that much.

Next, another conventional sintered ore cooling method is disclosed in Japanese Laid-Open Patent Publication No. 59-200730, which is a method of cooling the sintered ore 120 by spraying only mist from the lower portion of the sinter cooler 100.

However, in this case, there is a problem of not cooling the part having ventilation resistance in the cooler width direction and a problem of lowering energy efficiency.

Then, another conventional sintered ore cooling method is disclosed in Japanese Unexamined Patent Publication No. Hei 4-147925. In order to solve the problems described above, the sintered ore in the form of a spray using only water instead of mist using air ( It is a method of cooling the high temperature part (particularly divided sintered ore) of 120.

In this case, however, the amount of water used in the high temperature portion is reduced and the amount of water used in the low temperature portion at 90 ° C. is increased, thereby causing the problem of clogging the screen of the post process company while increasing the water content of the sintered ore 120.

The present invention has been made in order to improve the various problems as described above, the object of the present invention, when cooling to transport the sintered ore, which is the raw material of the blast furnace as a transport facility, cooling of the low-breathing minute sintered ore and air permeable good sintered ore It is to provide a sintered ore cooling method to improve the cooling efficiency of the sintered ore by cooling the step by dividing the steps into first and second as cooling water spray and mist.

In addition, another object of the present invention, by cooling the cold air supplied to the cooler for cooling the sintered ore is generated through the high temperature sintered ore to the high temperature air to supply to the boiler, to improve the thermal efficiency of the boiler to improve the energy utilization efficiency It is to provide a sintered ore cooling method.

The present invention as a technical configuration for achieving the above object, in the method for cooling the high temperature sintered ore distributed in the sintering equipment in the sinter cooler, by supplying and blowing cold air and mist in the lower part of the cooler bogie to cool the sintered ore Primary cooling step to cool the sintered ore:

A temperature measuring step of measuring a surface temperature of the sintered ore having undergone the first cooling step;

If the surface temperature of the sintered ore is higher than the sintered ore discharge temperature, supplying and spraying cold air and cooling water spray from the upper part of the cooler to further cool the red part of the sintered ore; And,

By supplying the hot air generated in the first and second cooling step to the boiler to use the heat of the high temperature air by providing a sintered ore cooling method comprising a.

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

3 shows a schematic diagram of a chiller installation for explaining a sintered ore cooling process according to the present invention. Hereinafter, the sintered ore cooling method according to the present invention will be described.

First, the sintered ore cooling method of the present invention primarily cools the air permeable opposing sintered ore 120a in cold air and mist (m), and then measures the surface temperature of the sintered ore as the sensor 10. For example, when the temperature is higher than 100 ° C., which is an appropriate discharge temperature of the sintered ore, the air permeability is weak in the sintered ore 120 again, and the cold water together with the cold air is further added to the cold sintered ore 120b that is not effectively cooled as the primary cold and mist. By spraying the spray w again to cool, the cooling efficiency of the sintered ore in the sinter cooler 100 is improved.

That is, as shown in FIG. 3, the sintered ore 120 is opposed to the sintered ore 120 through the charging chutes 140a and 140b on the trolley 102 in the sinter cooler 100. When charged as in the case, since the minute sintered ore 120b is poor in breathability, while simultaneously spraying the mist (m) through a plurality of mist nozzles 20 installed below the trolley 102 of the cooler 100, the cooler ( Cold air is supplied through the blower tube 150 of 100 to perform primary cooling of the sintered ore 120.

At this time, the mist nozzle 20 is electrically connected to the control unit (C) and its operation is controlled.

Next, when the sintered ore cooling is performed in section A of FIG. 3 mainly with the highly sintered opposing sintered ore 120a in the sintered ore 120 through the first cooling step, the surface temperature of the sintered ore 120, that is, breathable The surface temperature of the fragile sintered ore 120b, which is weak and does not cool smoothly, is measured as the temperature sensor 10, that is, the non-contact infrared temperature sensor 10, installed on the cooler side at the top thereof.

At this time, the surface temperature value of the sintered ore 120 measured by the temperature sensor 10 is sent to the control unit (C) electrically connected to the temperature sensor 10, if the cooler discharge temperature of the sintered ore 120 is higher than 100 ℃ In the control unit (C), the spray nozzle 30 of the upper part of the electrically connected cooler is operated to supply the cool air, and the cooling water spray w is not cooled in the primary cooling step. It is made to spray on the sintered ore 120b.

That is, even if the cold air and the mist (m) is first supplied and sprayed from the lower portion of the bogie to cool the sintered ore 120 primarily, if the light distribution temperature in the sintered bogie is too high and higher than the discharge proper temperature of the sintered ore 120, Secondarily, the high-temperature powdered sintered ore 120b, which is poorly ventilated and not cooled, is intensively cooled again by cold air and cooling water spray w in section B of FIG. 3.

As a result, in the present invention, the problem of uncooling due to the aeration in the divided sintered ore 120b using only cold air and mist or cooling water spray is divided into the A section and the divided sintered ore in which the primary sintered ore 120a is mainly cooled. Cooling the sintered ore more effectively by dividing 120b) into section B, which mainly cools the sintered ore, and prevents damage to the belt conveyor, which is a transportation facility by the sintered ore discharged from the cooler 100. Furthermore, environmental pollution caused by poor transport of sintered ore is also prevented.                     

Next, as shown in FIG. 3, the high-temperature air (the forward arrow of FIG. 3) generated by the high-temperature sintered ore when cold wind passes through the section A of the opposing sintered ore during primary cooling and the second cooling time The hot air (the reverse arrow in FIG. 3) generated by the cold wind passing through the section B of the minute sintered ore is sent to the section C which is the boiler supply section.

Therefore, although the boiler 160 is conventionally supplied with air at room temperature to generate steam, in the present invention, by supplying the hot air generated in the first and second cooling stages in the boiler 160, the thermal efficiency of the boiler and It is to improve energy use efficiency.

On the other hand, when the primary cooling step, that is, the cold air and the mist (m) to supply and spray the sintered ore 120 in the lower portion of the bogie 102, the particle diameter of the mist (m) should be determined corresponding to the cold wind speed, Such a cold wind speed is preferably maintained at a maximum of 10 m / s or less so that the divided sintered ore 120b stacked upon charging on the opposing sintered ore 120a is not scattered (swept) by the cold wind.

If the cold air is supplied through the blower pipes 150 at a speed of 10 m / s or more, the sintered ore 120b is scattered and there is a risk of severely polluting the air around the cooler 100.

And, when the mist (m) sprayed with the cold air supplied at the speed is too large, the mist (m) is smoothly suspended and do not evenly penetrate into the sintered ore 120, in particular, the opposing sintered ore (120a), the mist nozzle ( The particle diameter of the mist (m) sprayed through 20) is most preferably 2000 μm or less. In this case, the particle diameter of the mist (m) should be reduced as the speed of the cold wind decreases.

That is, the cooling efficiency is maintained while the mist (m) is uniformly distributed on the sintered ore side by the flow rate of the cold wind, because the mist diameter is large, but the cooling of the mist is not smooth when the cold wind speed is reduced.

At this time, the mist nozzle 20 installed below the trolley 102 of FIG. 3 for injecting the mist (m) is connected to the control unit C, the operation of which is controlled, and the mist nozzle 20 is the trolley 102 It is most preferred to be spaced apart from 30 ~ 40cm from), if it is out of the above range, the mist (m) will reach the sintered ore before the mist is widely suspended, or the mist will not reach the sintered ore smoothly.

In addition, the injection amount of the mist (m) is also important, the amount of the mist (m) is injected is different depending on the cooling temperature width of the sintered ore 120, specifically, the air permeable good sintered ore (120a), for example As a result of the experiment, when the sintered ore 120 is cooled at 20 ° C, the mist injection amount is 100 l / min, and when the temperature cooling width is 40 ° C, the mist injection amount is 200 l / min. It is preferable to set the injection amount of the mist to 400 l / min, and eventually, the injection amount of the mist increases as the cooling temperature width increases.

However, even if the mist injection amount is increased indefinitely, there is a mist loss that does not cool the sintered ore in the sprayed mist. For example, when the mist injection amount is 200 l / min or less, the mist loss rarely occurs. However, when the mist injection amount is 200 l / min or more, the mist loss amount is rapidly increased, so in the sintered ore cooling method of the present invention, the mist (m) sprayed in the section A mainly cooling the opposing sintered ore 120a. Most preferably, the amount of is limited to a maximum of 200 l / min or less.

In addition, in the secondary cooling step of the present invention, the injection amount of the coolant spray injected as the spray nozzle 30 on the upper side of the trolley 102 together with the cold air supplied to mainly cool the divided sintered ore 120b is a temperature width to cool. And the thickness of the stacked sintered ore 120b that is not completely cooled in the primary cooling step in the sintered ore.

For example, the injection amount of the cooling water spray in the secondary cooling step is to cool the spraying temperature to a temperature range of 50 ℃ when the laminated thickness of the powder sintered ore (120b) is 10cm, the injection amount is 12 l / min, the cooling temperature When the width is 100 ° C, the injection amount of the cooling spray is 24 l / min, and when the cooling temperature width is 200 ° C, the injection amount of the cooling water spray is 48 l / min.

When the laminated thickness of the divided sintered ore 120b is 20 cm, the spraying amount of the cooling water spray is twice the spraying amount described above, that is, 24,48,96 l / min, and the laminated thickness of the divided sintered ore 120b is 30 cm. In this case, the spraying amount of the cooling water spray (w) is preferably tripled, that is, 36, 72, 144 l / min. As a result, the spraying amount of the cooling water spray (w) in the secondary cooling step increases the laminated thickness of the divided sintered ore (120b). Most preferably, it is increased by the same multiple.

At this time, even if the laminated thickness of the powdered sintered ore 120b in the sintered ore 120 that is not smoothly cooled due to poor ventilation in the first cooling step is increased, if the injection amount of the coolant spray w is not increased, the actual sintered ore 120 ), The surface temperature of the high temperature sintered ore 120b drops to the uncooled portion of the first cooling stage during the second cooling, and cooling is not performed because the cooling water spray w does not penetrate to the inside thereof.

Then, as described above, if the sintered ore 120 is effectively cooled on the cooler bogie 102 as cold air and mist (m) and cold air and cooling water spray (w) over the first and second stages, the present invention is the last in the cooling method. As a step, the hot air generated in the sections A and B of FIG. 3 is supplied to the C region of FIG. 3 to increase the thermal efficiency of the boiler 160.

That is, when the air at room temperature passes through the zone C of FIG. 3, the air temperature at room temperature is heated and discharged to 350 ° C. while being passed through the high temperature sintered ore and supplied to the 160 to be seen, as in the present invention. Passing hot air (forward and reverse arrows in FIG. 3) through section C at the secondary cooling section A and the secondary cooling section B at 150 ° C. causes the air passing through section C to be heated to 450 ° C., and thus the boiler ( 160) to increase the water vapor production by 15%.

Next, the present invention will be described as examples.

EXAMPLE

First, in the case of cooling through the sintered ore cooling method of the present invention, the cooling temperature of the sintered ore 120 when the mist (m) is sprayed about 60 l / min through the mist nozzle 20 in the first cooling step is shown in the following table. 1 is shown.                     

Cooling temperature of sintered ore when using mist and coolant spray Surface temperature (℃) of the sintered ore 120 Cooling temperature range before using mist and coolant spray When using mist When using coolant spray When using mist and coolant spray Powder sintered ore (120b) 500-> 398 500-> 376 500-> 318 500-> 310 Opposite Sintered Ore 120a 337-> 234 337-> 211 337-> 234 337-> 209

That is, as can be seen from Table 1, before using the mist (m) and the cooling water spray (w) in the zone B of Figure 3, that is, when the sintered ore is cooled only by cold air, 102 ℃ in the sintered ore among the sintered ore In the alternative sintered ore, the cooling effect was 103 ° C. However, when the mist (m) was used, the cooling effect was 124 ° C in the divided sintered ore and 126 ° C in the alternative sintered ore.

In addition, when the cooling water spray (w) was used, there was a cooling effect of 182 ° C. in the sintered ore and 103 ° C. in the opposing sintered ore. In addition, when cooling water spray (w) was used simultaneously, it turned out that there exists a cooling effect of 190 degreeC in a sintered ore and 128 degreeC in an opposing sintered ore.

As a result, the cooling method of the present invention, that is, by primarily supplying and spraying the cold air and the mist (m) from the lower portion of the bogie 130 to cool mainly the air permeable good sintered ore 120a of the sintered ore 120, and then the surface of the sintered ore When the temperature of the sintered ore is measured and the temperature of the sintered ore is high, the target part is secondly sprayed with cold air and cooling water spray (w) to mainly cool the minute-vented small particle 120b, thereby further increasing the cooling efficiency of the sintered ore as a whole.

Next, Table 2 below shows the results for the step of increasing the thermal efficiency of the boiler by supplying the hot air generated in the cooling step to the boiler 160 as the last step in the cooling step of the present invention.

Boiler efficiency division Inlet air temperature (° C) in zone C of Figure 3 Exhaust air temperature (° C) in zone C of Figure 3 Steam emissions from boiler 160 (t / hr) Before supplying air to the boiler 25 350 21.5 After supplying air to the boiler 150 450 27.5

Therefore, as can be seen in Table 2, when generating steam by supplying air at room temperature to the boiler 160 as in the prior art, the amount of steam generated was 21.5t / hr, as shown in Figure 3, passing through the A zone As a result of supplying one air (forward arrow) and air passing through zone B (reverse arrow) to the boiler 160 supply zone, zone C, the exhaust air temperature in this zone was 350-> 450 ° C and above 100 ° C. As it rises, it can be seen that the amount of steam generated in the boiler 160 is increased by about 6t / hr to 27.5t / hr.

Thus, according to the sintered ore cooling method of the present invention, the surface temperature of the sintered ore during cooling of the sintered ore is mainly measured by the mist (mist) and cold air blown through the mist nozzle installed in the lower portion of the cooler of the cooler and primarily air sintered ore with good ventilation. By cooling the secondary sintered ore, which is poorly ventilated, as a cooling water spray, the cooling efficiency of the sintered ore can be increased, thereby preventing damage to the transport belt conveyor and fire caused by the poor cooling of the sintered ore. have.

In addition, since the sintered ore is cooled as cold air, mist and cold air and cooling water sprays for the second time, the high temperature air generated in the second time during the sintering ore cooling process can be recycled in the boiler, thereby improving the energy utilization efficiency. To provide.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (5)

In the method of cooling the high temperature sintered ore distributed in the sintering equipment in the sinter cooler, The primary cooling step of cooling the sintered ore by supplying and spraying cold air and mist from the lower part of the cooler bogie that cools the sintered ore: A temperature measuring step of measuring a surface temperature of the sintered ore having undergone the first cooling step; If the surface temperature of the sintered ore is higher than the sintered ore discharge temperature, supplying and spraying cold air and cooling water spray from the upper part of the cooler to further cool the red part of the sintered ore; And, And supplying hot air generated in the first and second cooling steps to the boiler to use heat of the hot air. The method of claim 1, wherein in the primary cooling step, the highly sintered opposing sintered ore is mainly cooled, and in the secondary cooling step, a concentrated sintered ore that is difficult to cool as a mist due to poor ventilation in the sintered ore is further concentrated as a cooling water spray. Sintered ore cooling method characterized by cooling. According to claim 1, wherein the mist (m) is injected in the first cooling step is installed through the bogie 102 of the cooler 100 through a plurality of mist nozzles 20 electrically connected to the control unit (C) Become, The surface temperature of the sintered ore after the first cooling step is measured as a non-contact infrared temperature sensor 10 electrically connected to the control unit (C), wherein the sintered ore discharge temperature is 100 ℃ or less, Cooling water spray (w) is injected in the secondary cooling step is installed on the cooler and the sintered ore cooling method characterized in that it is sprayed through a cooling water spray nozzle (30) electrically connected to the control unit (C). According to claim 1, wherein the cold wind speed in the primary cooling step is 10m / s or less, the particle diameter of the mist (m) injected through the mist nozzle 20 is 2000㎛ or less, the mist particle diameter is Reduced in proportion to the cold wind speed, Sintered ore cooling method characterized in that the injection amount of the mist (m) is limited to a maximum of 200 l / min or less. The method of claim 1, wherein the injection amount of the coolant spray (w) injected in the second cooling step is integrally increased in multiples when the laminated thickness of the divided sintered ores among the sintered ores stacked on the cooler bogie increases by multiples. Sintered ore cooling method.

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