KR101353458B1 - Method of decreasing in porous ratio of coke - Google Patents

Abstract

The present invention relates to a method of reducing the porosity of coke, which improves the cold strength of coke by improving the structure of coke during coking.
The present invention includes the steps of: (a) charging coal into a first carbonization chamber having a relatively high internal pressure in a carbonization chamber in which carbon is carbonized to produce coke; (b) allowing the first carbonization chamber to communicate with the second carbonization chamber having a lower internal pressure than the first carbonization chamber among the carbonization chambers; (c) blocking the gas collection pipe pressure of the second carbonization chamber so that the tar component of the low coke gas of the first carbonization chamber penetrates the coke pores of the second carbonization chamber; Provide a method.

Description

Reduction method of coke porosity {METHOD OF DECREASING IN POROUS RATIO OF COKE}

The present invention relates to a method of reducing the porosity of coke, and more particularly, to a method of reducing the porosity of coke by improving the structure of coke during the coking process to improve the cold strength of the coke.

In general, coke plays an important role in heat sources, reducing agents and breathability. Coke strength is important in order to sufficiently secure the breathability and maintain the structure of the charge, and the most important factor of the coke quality is cold strength (DI strength).

The cold strength refers to the percentage of the coke coke with respect to the drop impact and wear by rotating the sample sifted by particle size in a drum, and the conventional coke cold strength improvement technology is a blending technology, coal ( coal) Moisture reduction, coal particle size optimization, additive development.

Most of the existing coke cold strength improvement techniques described above have been coal mix ratio optimization and pretreatment (moisture and particle size adjustment).

In other words, there is no technology that can improve quality during the coking process after coal is charged into the carbonization chamber. The reason for this is that, until now, the caulking process has been regarded as an unmanageable part.

However, the coking process is a process of forming coke has a great effect on the coke structure.
On the other hand, as a prior art document related to the present invention to be described later there is a 'dispersion gas collecting device of the coke oven' of Republic of Korea Patent Publication No. 10-0928781 (registered November 19, 2009).

The present invention has been made to solve the above problems, an object of the present invention is to provide a method of reducing the porosity of coke to improve the cold strength by improving the coke structure during the coking process.

The method of reducing the porosity of coke of the present invention for achieving the above object comprises the steps of: (a) charging coal into a first carbonization chamber having a relatively high internal pressure in a carbonization chamber producing carbonized coke; (b) allowing the first carbonization chamber to communicate with the second carbonization chamber having a lower internal pressure than the first carbonization chamber among the carbonization chambers; (c) blocking the pressure of the gas collection pipe of the second carbonization chamber so that the tar component of the low coke gas of the first carbonization chamber penetrates the coke pores of the second carbonization chamber. do.

In the present invention, the movement of the low coke gas of each carbonization chamber to the adjacent carbonization chamber is made through a low coke gas distribution pipe connecting the ascending pipes of the respective carbonization chambers.

The communication and blocking of the low coke gas distribution pipe are performed by opening and closing a gate valve provided in the low coke gas distribution pipe.

In the present invention, after the step (c), (d) communicating the gas collecting tube of the second carbonization chamber; (e) blocking the gas passages of the first and second carbonization chambers so that the low coke gas of the first carbonization chamber does not move to the second carbonization chamber.

In the step (e), the gas passages of the first and second carbonization chambers are blocked by closing the gate valve provided in the low coke gas distribution pipe connecting the ascending pipes of the first and second carbonization chambers.

According to an embodiment of the present invention, by injecting raw coke (Raw COG) into the coke during the coking (Coking) process to reduce the porosity, it is possible to improve the cold strength of the coke by increasing the pore wall thickness.

In addition, gas leaks can be reduced by distributing a large amount of low coke gas generated immediately after coal charging to an adjacent carbonization chamber.

1 is a flow chart sequentially showing a method for reducing the porosity of coke according to an embodiment of the present invention.
2 is an explanatory diagram illustrating a carbonization chamber working situation to which a method of reducing porosity of coke according to an embodiment of the present invention is applied.
3 to 5 are explanatory diagrams shown for explaining the coke production process.
6 is a test graph showing the relationship between porosity and strength of coke.
7 is a graph showing a pressure state inside the carbonization chamber during the caulking process.

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

1 is a flow chart sequentially showing a method of reducing the porosity of coke according to an embodiment of the present invention, Figure 2 is an explanatory diagram illustrating a working condition of the carbonization chamber applied to the method of reducing the porosity of coke according to an embodiment of the present invention Is shown.

1 and 2, the method of reducing the porosity of coke according to an embodiment of the present invention, first, when the coal is charged through the charging in the charging car in the carbonization chamber 300 to dry the coal to produce coke Coal is charged into the first carbonization chamber D having a relatively high pressure (step 210).

In addition, the first carbonization chamber D and the carbonization chamber 300 may communicate with the second carbonization chamber D + 1 having a lower internal pressure than the first carbonization chamber D (step 220).

Subsequently, the pressure of the gas collecting tube [GC (Gas Collecting) Main] 301 of the second carbonization chamber (D + 1) is completely shut off, so that the low coke gas of the first carbonization chamber (D) becomes the second carbonization chamber ( D + 1) (step 230).

In this case, blocking completely means closing 100% sealed.

As shown in FIG. 2 to perform the above process, each carbonization chamber (D, D + 1) connecting the gas generated when coal carbonization in the carbonization chamber (300) to the gas collection pipe (301) is performed. , The rising pipes 302, 303 and 305 of D-1 are connected to the low coke gas distribution pipe 304 so that the low coke gas can be moved to the adjacent carbonization chambers D, D + 1 and D-1.

The low coke gas distribution pipe 304 is provided with gate valves 306 and 307 to open and close the low coke gas distribution pipe 304 as necessary.

Therefore, as in step 220, the gate valve provided in the low coke gas distribution pipe 304 on the side of the second carbonization chamber (D + 1) for communication between the first and second carbonization chambers (D, D + 1) ( 307 is opened.

In addition, in step 230, in order to completely block the pressure of the gas collecting pipe 301, the connection part (eg, the curved pipe part) of the rising pipe 302 of the second carbonization chamber D + 1 and the gas collecting pipe 301 is removed. For example, a fix cup 308 allows for a complete sealing.

Then, the coke oven gas (Raw COG) of the first carbonization chamber (D) moves to the second carbonization chamber (D + 1) adjacent to the first carbonization chamber (D) and tar of the low coke gas (tar) ) Component penetrates into the coke pores of the second carbonization chamber (D + 1).

Therefore, the porosity of the coke in the second carbonization chamber (D + 1) is reduced to improve the cold working of the coke.

On the other hand, the gas collecting tube 301 is a known technique, the low coke gas of 700 ~ 800 ℃ generated in the carbonization chamber 300 sprays the ordination water on the curved pipe portion and the gas collecting tube 301 of the rising pipe (302,303,305) It is sprayed to lower the gas temperature to 80 ~ 90 ℃.

After the step 230, the riser 302 and the gas collecting tube 301 of the second carbonization chamber D + 1 communicate with each other while the extruder of the second carbonization chamber D + 1 is on standby. (Step 240,250)

To this end, a connection part (eg, a curved pipe part) of the rising pipe 302 and the gas collecting pipe 301 of the second carbonization chamber D + 1 is opened.

Subsequently, the low coke gas distribution pipe 304 connecting the rising pipes 303 and 302 of the first and second carbonization chambers D and D + 1 is blocked (step 260). The gate valve 307 provided in the low coke gas distribution pipe 304 on the +1 side is closed.

Thereafter, the second carbonization chamber (D + 1) is extruded through an extruder, and then coal is charged into the second carbonization chamber (D + 1). (Steps 270 and 280)

In the following, the basis and principle of the method for reducing the porosity of coke according to the embodiment of the present invention made of the process as described above will be described in more detail.

First, as shown in FIG. 1, coke is produced by distilling coal charged in the carbonization chamber 300 at a temperature of about 1,100 ° C.

Coal (coal), as shown in Figure 3, drying (100 ℃), melting (350 ℃), solidification (500 ℃), shrinkage (700 ℃), etc. as the temperature rises and the final coke ( 950 ° C.) is produced.

In addition, since heat is transferred from both walls of the carbonization chamber to the center of the carbonization chamber, as shown in FIG. 4, coking is performed from the wall portion.

As shown in FIG. 5, the tissues and pores formed during the caulking process have a significant effect on the coke strength. In particular, many pores are formed in the coke as the volatile matter (VM) generated during the coking process exits (coke porosity is about 50%).

When the coke is stressed, stress concentration occurs around the pores inside the coke, and cracks become larger, resulting in splitting.

Therefore, the smaller the porosity and the thicker the wall thickness, the better the coke cold strength is.

Meanwhile, a graph of test results showing the relationship between porosity and coke strength is shown in FIG. 6.

Referring to FIG. 6, the coke of the head part 0 to 60 mm away from the carbonization chamber wall and the coke of the body part 60 to 120 mm apart were sampled to measure the strength. Higher.

In addition, comparing the average values of porosity, wall thickness, and roundness between the two samples showed that the coke porosity of the head part was low, the wall thickness was thick, and the roundness was high.

The above test can confirm that the porosity, wall thickness, and roundness are correlated.

The difference in strength is due to the reduction of porosity as the tar components generated when the coal in the body part, which is the central part of the coke oven, are coked, move to the head part on the wall side.

As can be seen from the above test results, the coke cold strength is improved by filling the pores by utilizing the tar component in the gas generated when caulking (Raw COG).

On the other hand, as shown in the graph of Figure 7, the raw coke (Raw COG) generated during the coking process (Raw COG) is the highest amount from 20 to 20% from the start of the coking, there is no gas generation after 90%.

In addition, the carbonization pressure up to 20% immediately after caulking is the highest due to the low coke gas generation. At this time, by passing the generated low coke gas to the adjacent carbonization chamber next to the tar component in the low coke gas serves to reduce the pores of the coke is being caulked.

In the case of adjacent carbonization chambers, low coke gas is hardly generated since the end of dry distillation.

Therefore, as described above with reference to FIG. 2, the second carbonization chamber having a low internal pressure from the first carbonization chamber D having a high internal pressure by connecting the rising pipes 302, 303, 305 and the low coke gas distribution pipe 304 to each other. Allow low coke gas to move to (D + 1).

In addition, since the low coke gas is hardly generated, the pressure of the gas collecting pipe 301 of the second carbonization chamber D + 1 having a low internal pressure is completely blocked by, for example, a fix cup 308, and the adjacent first carbonization chamber is completely blocked. The tar component of the low coke gas migrated from (D) is allowed to penetrate the coke pores. This improves the cold strength by reducing the coke porosity in the second carbonization chamber (D + 1).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

300: carbonization chamber
301: gas collecting tube
302,303,305: riser
304: low coke gas distribution pipe
306,307: Gate Valve
D: 1st carbonization chamber
D + 1: 2nd carbonization chamber

Claims (5)

(a) charging coal into a first carbonization chamber having a relatively high internal pressure in a carbonization chamber carbonizing coal to produce coke;
(b) allowing the first carbonization chamber to communicate with the second carbonization chamber having a lower internal pressure than the first carbonization chamber among the carbonization chambers;
(c) blocking the pressure of the gas collection pipe of the second carbonization chamber so that the tar component of the low coke gas of the first carbonization chamber penetrates the coke pores of the second carbonization chamber. Method of reducing porosity of coke. The method of claim 1,
A method of reducing coke porosity, wherein the low coke gas of each carbonization chamber is moved to an adjacent carbonization chamber through a low coke gas distribution pipe that connects an ascending pipe of each carbonization chamber. 3. The method of claim 2,
Communication and interruption of the low coke gas distribution pipe is performed by opening and closing a gate valve provided in the low coke gas distribution pipe, characterized in that the coke porosity reduction method. The method of claim 1,
After step (c),
(d) communicating a gas collecting tube of the second carbonization chamber;
(e) blocking gas passages of the first and second carbonization chambers so that the low coke gas of the first carbonization chamber does not move to the second carbonization chamber; . 5. The method of claim 4,
In the step (e)
The gas passage of the first and second carbonization chambers is blocked by closing a gate valve provided in a low coke gas distribution pipe connecting the upstream pipes of the first and second carbonization chambers. .

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