KR101257567B1 - extinguishing method for hot cokes - Google Patents

Abstract

The present invention relates to a method for extinguishing a red coke, wherein the upper digestive water sprinkling step and the lower digestive water injecting step are performed at the same time, the lower digestive water injecting step is performed by the first step of the small opening degree of valve opening, and then the valve opening degree. Increase the rate and perform two stages of infusion.
In addition, when the supply of the extinguishing water is stopped, the first drain is immediately performed inside the digestion tower, and then, after the extinguisher is released from the digestion tower, a second additional drain is performed at the warp discharge standby position.
Therefore, by minimizing the moisture of the coke under the condition that no warping occurs in the warp, it is possible to prevent the remaining of the warp in the warp, and the need for additional energy consumption for evaporation of the coke water is reduced, thereby reducing the cost of manufacturing the molten iron of the blast furnace.

Description

Extinguishing method for hot cokes

The present invention relates to a method for extinguishing a red coke, and more particularly, to a wet extinguishing method for extinguishing a red coke by sprinkling water in a digestion tower.

Coke is a high-carbon porous solid fuel obtained by high-temperature drying of coal, not only becomes a heat source in the manufacture of molten iron in a blast furnace, but also serves to reduce iron ore.

The coke is dried in a coke oven and then extinguished by being discharged into an extinguisher by an extruder.

The present invention reduces the cost of molten iron production by minimizing the residual water content of the coke after the end of the digestion when extinguishing the red coke using a wet fire extinguishing method, to provide a red coke fire extinguishing method for preventing the generation of residue in the warp. There is a purpose.

The present invention for achieving the above object, the upper digestive water sprinkling step of spraying the digestive water to the upper portion of the coke box containing the coke;

A lower digestive water injection step of injecting digestive water into the lower portion of the coke box;

A digestion water supply stopping step of stopping supply of the upper digestion water and the lower digestion water;

And a digestion water drain step of discharging the digestion water inside the coke box to the outside.

In addition, the amount of digestive water supplied through the upper digestive water spraying step and the lower digestive water injection step is more than 98 to 100 tons, the ratio of the upper digestive water and the lower digestive water is 14.3 ± 1.0%: 85.7 ± 1.0 It is characterized by being%.

In addition, the lower extinguishing water injection step, the lower extinguishing water injection to inject the lower extinguishing water in the range of 35% or more to less than 45% of the opening degree of the valve installed in the digestive water supply pipe for supplying the extinguishing water to the coke box 1 Steps,

The lower extinguishing water injection step of injecting the lower extinguishing water in the range of 75% or more to less than 85% of the opening degree of the valve, characterized in that it comprises a step.

In addition, the digestion water draining step, characterized in that it comprises a primary digestion water draining step is carried out at the internal position of the digestion tower at the same time as the completion of the digestion water supply stop step.

In addition, the digestion water draining step. After the fire extinguishing vehicle exits the digestion tower after the first digestion water draining step, it further comprises a second digestion water draining step is carried out further in the standby position before the warp.

In addition, the dust collector washing water injection step of spraying the dust collector washing water for removing the dust of the dust collector installed on the upper portion of the digestion tower during the upper digestion water spraying step and the lower digestion water injection step is characterized in that it is carried out.

According to the present invention as described above, after extinguishing the red coke, the residual moisture of the coke is minimized, so that no additional heat amount for evaporating the coke moisture during blast furnace operation is required, thereby reducing the cost of manufacturing the molten iron of the blast furnace.

In addition, since the coke moisture is adjusted to the extent that no warping occurs in the warp, no warping occurs in the warp, and thus, no need to perform additional watering for the evolution of the warping, so that coke moisture increase is prevented and coke caused by the burning of the coke. Quantity loss is reduced.

1 is a configuration diagram of a cooling tower used for wet extinguishing a red coke;
2 is a block diagram showing a method of extinguishing coke in accordance with the present invention;
3 is a graph of coke water (%)-digestion (ton) showing a result of performing a plurality of digestion experiments by varying the total digestion rate and the upper / lower digestion ratio.

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

1 is a block diagram of a fire extinguishing tower for carrying out wet digestion according to the present invention.

Digestion tower 10 is a structure of about 70m in height, the fire truck 20 is to enter and exit the lower space.

The digestion tower 10 has a water tank 30 is installed in the middle portion, the extinguishing water supply pipe 31 connected to the water tank 30 extends downward to the coke box 21 of the fire truck 20 It is to be able to supply water to the digestion water injection pipe 22 connected to.

Since the digestion water injection pipe 22 is connected to the lower end of the coke box 21, the digestion water injected is digested from the glowing coke stacked at the bottom while filling up from the lower part of the coke box 21.

In addition, the digestion water spray nozzle 40 connected to the digestion water supply pipe 31 is installed in the digestion tower 10 immediately above the coke box 21, it is possible to spray the digestive water to the top of the red coke. It is supposed to be.

In addition, the upper and lower two-stage dust collector 50 is installed on the upper part of the digestion tower 10, and the dust collector washing water injection nozzle 60 is installed in close proximity to each dust collector 50, so as to spray water or steam to collect the dust collector. It is possible to remove dust adhering to 50.

Now, a description will be given of the coke fire extinguishing method according to the present invention using the digestion tower (10).

As shown in Figure 2, the present invention is the upper digestive water spraying step (S10) and the digestive water injection pipe 22 to spray the digestive water to the upper portion of the coke box 21 through the digestive water spray nozzle (40) It includes a lower digestive water injection step (S20) for injecting digestive water into the lower portion of the coke box 21 through).

At this time, the appropriate amount of the total digestion water supplied into the coke box 21, the upper digestive water sprayed through the extinguishing water spray nozzle 40 and the lower extinguishing water injected through the extinguishing water injection pipe 22 In order to find out the proper ratio, experiments such as Table 1 and FIG. 3 were performed.

First, the total digestion is divided into three cases of 90 to more than 98 tons, 98 to 100 tons, and 100 to 105 tons, and the ratio of upper and lower extinguishing water to each case is 12.4 ± 1.0: Three cases of 87.6 ± 1.0, 14.3 ± 1.0: 85.7 ± 1.0, and 16.6 ± 1.0: 83.4 ± 1.0 were applied to each of the nine cases. The deviation was calculated.

That is, a total of nine cases of the experiments were carried out a plurality of times, and among them, the case with the least average and deviation of the water content ratio was set as the preferred digestive conditions.

division Digestion amount
(ton) Top / bottom
Digestion Water Ratio moisture(%) Average Deviation One over 90
~ Less than 98 12.4 ± 1.0: 87.6 ± 1.0 1.2 1.0 2 14.3 ± 1.0: 85.7 ± 1.0 2.1 1.2 3 16.6 ± 1.0: 83.4 ± 1.0 3.6 1.5 4 98 or more
~ Less than 100 12.4 ± 1.0: 87.6 ± 1.0 3.3 1.51 5 14.3 ± 1.0: 85.7 ± 1.0 1.0 0.46 6 16.6 ± 1.0: 83.4 ± 1.0 2.3 0.82 7 More than 100
~ Less than 105 12.4 ± 1.0: 87.6 ± 1.0 3.5 0.62 8 14.3 ± 1.0: 85.7 ± 1.0 2.6 0.78 9 16.6 ± 1.0: 83.4 ± 1.0 2.2 0.57

* The amount of extinguishing water is the amount of extinguishing water supplied per 43 tons of red coke (the amount of coke loaded into the coke box).

In the results of Table 1, the case with the smallest deviation from the mean of the coke water content (exactly, the content ratio) is case 5 with an average of 1.0 and a deviation of 0.46.

Therefore, the number of digestive water is 98 to more than 100 tons less than the watering condition of the case 5, the upper digestive water sprayed through the extinguishing water spray nozzle 40 and the lower extinguishing water injected through the digestive water injection pipe 22 It can be seen that the condition of the ratio of 14.3 ± 1.0%: 85.7 ± 1.0% is the optimal condition to minimize the amount of coke moisture and deviation.

When the amount of digestion water in Table 1 is less than 98 tons, the water deviation is large, and the occurrence of residue increases, and thus, additional watering is performed for the digestion of the residue, and consequently, the amount of moisture is increased.

In addition, when the amount of digestive water is more than 100 tons, the deviation is reduced, but the amount of water increases, so the energy required to evaporate the increased water is required to increase the cost of molten iron in the blast furnace.

In addition, even if the digestion water amount is more than 98 tons to less than 100 tons, when the upper / lower digestion water ratio is 12.4 ± 1.0: 87.6 ± 1.0, the average water content is greatly increased due to the excessive increase in the lower digestion water, and 16.6 ± 1.0: 83.4 In the case of ± 1.0, it is not preferable because the amount of water deviation is large, so that afterglow occurs and additional watering is required.

Therefore, it can be confirmed again that the watering condition of the case 5 is the most appropriate condition for reducing the average amount of water and the deviation.

On the other hand, the lower digestion water injection step is carried out divided into two stages of the lower digestion water injection step 1 (S21), and the lower digestion water injection step 2 (S22).

The lower digestion water injection step (S21) is an experimental result of calculating the water content ratio (%) and the deviation of the coke while changing the opening degree of a valve (not shown) installed in the digestion water supply pipe 31. According to 2, the valve opening rate is performed at 35% or more and less than 45%.

division Valve opening rate (%) moisture(%) Deviation One 20 or more ~ less than 35 1.2 1.0 2 35 or more but less than 45 0.9 0.43 3 45 or more ~ less than 60 1.1 0.51

As shown in Table 2, when the valve opening rate is less than 35%, the total extinguishing time is increased and the coke deposition time is increased, so that the water deviation is increased. If the opening rate is more than 45%, the water content ratio and the variation are not large, but pop corn phenomenon (a rapid vapor expansion occurs due to the large contact of the red coke and the digestive water, so that the red coke at the top strongly reaches the top of the digestion tower. It is not preferable because the risk of springing) is increased to increase the risk of damage to the internal equipment of the digestion tower (10).

Therefore, in the lower digestion water injection step 1 (S21), it can be seen that it is preferable to inject the lower digestion water by adjusting the valve opening rate to 35% or more and less than 45%.

Subsequently, in the second step of injecting the lower digestive water (S21), the extinguishing water is injected by adjusting the valve opening rate in a range of 75% or more and less than 85%, and when the valve opening rate is less than 75%, the extinguishing time is excessively increased. This is because there is a disadvantage in that the water deviation is increased by the increase in the deposition time, and when the 85% or more, the total digestion is excessively increased, which greatly increases the water content of the coke.

On the other hand, the entire process of the upper digestion water spraying step (S10) and the lower digestion water injection step 1 (S21) and the lower digestion water injection step 2 (S22) is carried out within 1 minute, and then the digestion water to stop the supply of digestion water The supply stop step (S40) is carried out.

The fire extinguishing time 1 minute is a value set appropriately in consideration of the digestion tower 10 equipment conditions (the amount of fire extinguishing water according to the valve opening time and the opening rate), and the setting is such that when the fire extinguishing time is 1 minute or more, This is because excessively increasing the water content ratio of the coke.

On the other hand, in order to remove the dust of the dust collector 50 during the execution of the upper digestion water spraying step (S10) and the lower digestion water injection step 1 (S21) and the lower digestion water injection step 2 (S22), dust collector washing water injection nozzle (60) Dust collector washing water injection step (S30) for injecting the dust collector washing water through).

Therefore, in consideration of the increase in the amount of extinguishing water by the extinguishing condition and the increase in the amount of extinguishing water by washing the dust collector washing water spraying step (S30), the upper extinguishing water spraying step (S10) is performed in a range of about 45 seconds to about 50 seconds, and the lower extinguishing water is injected. The first step (S21) is carried out in the range of 10 seconds to 15 seconds, the second step (S22) of the lower digestive water injection is preferably carried out in the range of 15 seconds to 20 seconds. At this time, the lower digestive water injection step 1 (S21) and the lower digestive water injection step 2 (S22) proceeds simultaneously with the upper digestive water spraying step (S10).

Immediately after the extinguishing water supply is stopped through the extinguishing water supply stopping step (S40), the drain valve of the coke box 21 is opened to discharge the extinguishing water inside the coke box 21. Water drain step (S50)) For this purpose, the first digestion water drain step (S50) is carried out in a state in which the digester 20 is located inside the digester 10.

The reason why the extinguishing water is drained immediately after stopping the supply of the extinguishing water as described above is that when the coke deposition time increases, a large amount of water penetrates into the pores of the coke, and thus the coke moisture content after the extinguishing is greatly increased.

On the other hand, even if the extinguishing water supply is stopped, the extinguishing water existing in the pipes such as the digestion water supply pipe 31 and the digestion water injection pipe 22 is drained into the coke box 21, thereby increasing the coke moisture content. In order to discharge sufficiently, it is preferable to perform the secondary drain additionally in the standby position (position before warp discharge) outside the fire extinguishing tower 10 after exiting the fire extinguishing vehicle 20 from the fire extinguishing tower 10. Digestion water drain step (S60))

The second digestion water drain step (S60) is carried out for more than 1 minute to minimize the coke moisture content.

On the other hand, after the fire truck 20 enters the digestion tower 10, the water is sprayed and injected, and after draining the water, the total fire time required to discharge the coke to the warp is carried out within approximately 3 minutes Done.

When the fire extinguishing is carried out under the extinguishing conditions according to the present invention as described above, the coke water content ratio discharged to the warp is managed within 1.0 ± 0.5%, whereby no warping occurs in the warp.

Therefore, it is possible to prevent the additional watering for the evolution of the residue, thereby preventing the increase in water content and the increase in deviation due to the additional watering.

As described above, according to the present invention, the moisture content of the coke can be reduced to a minimum at the level at which the occurrence of remaining in the warp is suppressed.

Considering adding 0.3kg / THM of coke to supply additional energy to remove water per 1% of water, the cost of molten iron can be reduced by reducing the coke input during blast furnace operation as described above. .

10: fire extinguishing tower 20: fire truck
21: coke box 22: digestion water injection pipe
30: water tank 31: digestive water supply pipe
40: extinguishing water spray nozzle 50: dust collector
60: dust collector washing water injection nozzle

Claims (6)

delete An upper digestive water sprinkling step of sprinkling digestive water on top of a coke box containing red coke;
A lower digestive water injection step of injecting digestive water into the lower portion of the coke box;
A digestion water supply stopping step of stopping supply of the upper digestion water and the lower digestion water;
And a digestion water drain step of discharging the digestion water inside the coke box to the outside.
The amount of digestion water supplied through the upper digestion water spraying step and the lower digestion water injection step is 98 to 100 tons or less, and the ratio of the upper digestion water and the lower digestion water is 14.3 ± 1.0%: 85.7 ± 1.0% Red coke fire extinguishing method, characterized in that. An upper digestive water sprinkling step of sprinkling digestive water on top of a coke box containing red coke;
A lower digestive water injection step of injecting digestive water into the lower portion of the coke box;
A digestion water supply stopping step of stopping supply of the upper digestion water and the lower digestion water;
And a digestion water drain step of discharging the digestion water inside the coke box to the outside.
The lower extinguishing water injection step, the lower extinguishing water injection step of injecting the lower extinguishing water in the range of 35% or more to less than 45% of the opening degree of the valve installed in the digestive water supply pipe for supplying the extinguishing water to the coke box; ,
Red coke fire extinguishing method comprising the step of injecting the lower extinguishing water injecting the lower extinguishing water in the range of 75% or more to less than 85% of the opening degree of the valve. The method according to claim 2 or 3,
The digestive water draining step, the red coke fire extinguishing method comprising a primary digestion water draining step is carried out at the internal position of the digestion tower at the same time as the termination of the digestion water supply stop step. The method of claim 4,
The digestive water draining step. And after the first digestion water draining step, after the extinguishing vehicle exits the digestion tower, further comprising a second digestion water draining step further performed at a standby position before the warp. The method according to claim 2 or 3,
Red dust coke fire extinguishing method characterized in that the dust collector washing water spraying step for spraying the dust collector washing water for dust removal of the dust collector installed on the upper portion of the digestion tower during the upper digestion water spraying step and the lower digestion water injection step.

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