JPH05263078A - Continuous vertical coke oven and production of coke - Google Patents

Abstract

(57) [Summary] [Purpose] A continuous vertical coke oven is operated at medium to low temperatures to produce highly efficient coke with no problem in blast furnace operation. [Composition] It has an extruder for charging coal in the upper part,
The carbonization chamber is continuous from above to below, and the combustion chambers on both sides of the carbonization chamber are continuous vertical coke ovens divided from above to below. A continuous vertical coke oven with a coal pressure transfer machine that moves coal downward while pressing the coal at multiple points along the furnace length direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke oven for carbonizing carbon to produce coke, and more particularly to a vertical continuous coke oven capable of continuously carbonizing carbon.

[0002]

2. Description of the Related Art A continuous vertical type coke oven has the advantage that it can be stored in a building and that it requires a small site area. In addition, there is little gas leakage or dust generation during operation, and steaming is used. It is known that a coke oven is capable of increasing the amount of gas generation and is capable of producing coke with high efficiency.

The above-mentioned conventional continuous vertical coke oven is
The following is a description with reference to the side view of FIG. 7. That is, in the conventional continuous vertical coke oven, the carbonization chamber 21 is continuous from the upper side to the lower side, and
The combustion chambers 22 on both sides of are divided into a plurality of sections from the upper side to the lower side. Then, the coal 23 is regularly fed to the auxiliary hopper 25 from the coal hopper 24 provided right above the furnace, and the coal 23 is discharged from the coke discharge port 25 at the bottom of the furnace to the coke hopper 26 every time the carbonization chamber 21 is discharged. To descend continuously. The rate of descent is determined by the rate of discharge of coke, so that the discharge of coke is adjusted so that the charging coal is completely coked by the time it reaches the lower end of the carbonization chamber 21.

Further, in order to facilitate the descent of coal and coke, the distance between the brick walls on both sides of the carbonization chamber 21, that is, the kiln width, becomes wider toward the lower part of the carbonization chamber 21. The coal 23 is heated by the gas and steam generated during carbonization in addition to being heated from the furnace wall in the carbonization chamber 21, and the carbonization is efficiently performed. And
The lowered coke is directly cooled by the steam introduced from the lowermost part of the carbonization chamber 21, and indirectly cooled by the cooling air circulating through the outer wall. The cooled coke is mechanically discharged from the carbonization chamber 21, temporarily stored in the coke hopper 26, and moved to a required place at an appropriate time. Further, the generated gas generated is discharged from a generated gas discharge hole 27 provided in the upper part of the coke oven.

[0005]

However, the above-mentioned conventional continuous vertical type coke oven is not used because of the following problems, and recently, it is mainly used to produce coke in a chamber type coke oven. It is commonplace.

(1) Due to expansion of coal and agglomeration of pyrolysis products, a decrease in hanging in a rack occurs in the carbonization chamber, so that smooth unloading cannot be achieved and efficient carbonization becomes difficult. (2) The properties such as particle size and strength of the produced coke are
It is inferior to the coke produced in the chamber furnace coke oven.

In order to solve such problems, a raw material coal having a certain range of grain size and a caking property is used, the vertical taper of the carbonization chamber is changed, and a hole for generating gas is opened. Measures are being considered, such as rotating the central part of the carbonization chamber where hanging is likely to occur and installing a compression extruder at the top of the furnace, but this is not yet a sufficient solution.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is a continuous vertical type coke oven which does not cause the hanging of the shelf and the quality of the produced coke is good, and this coke. It is an object of the present invention to provide a coke manufacturing method using a furnace.

[0009]

A continuous vertical coke oven according to the present invention has an extruder for charging coal in an upper portion, and a carbonization chamber is continuous from the upper side to the lower side. The combustion chambers on both sides of the carbonization chamber are continuous vertical coke ovens that are divided into multiple parts from the top to the bottom, and coal is pressurized at multiple points on both sides of the carbonization chamber along the furnace length direction. However, a coal pressure transfer machine for moving downward is provided.

The coke manufacturing method according to the present invention uses the above-mentioned continuous vertical coke oven and has a capacity of 1 to 2 kg.
While compressing coal intermittently with f / cm ² compressive force,
Coke is produced by dry-distilling coal at a final distillation temperature of 0 to 900 ° C. In the coke production as an embodiment of the coke production method, the gas generated during coal carbonization is sucked and discharged from a plurality of vertical positions in the coking chamber in the coke production method.

[0011]

In the continuous vertical coke oven according to the present invention, the coal charged in the carbonization chamber is subjected to carbonization,
With a plurality of coal pressure transfer machines installed on both sides of the carbonization chamber along the furnace length direction, we will move some of the coal under carbonization to the lower side of the carbonization chamber while sandwiching and pressing it from both sides. .. Then, when the coal reaches the coal pressure moving machine arranged below the coal pressure moving machine, the coal is moved downward while pressing the coal again. In this way, it is possible to move the coal to the lower side of the carbonization chamber one after another while pressurizing it, so that the coal is not suspended in the carbonization chamber,
Coke can be manufactured efficiently. Further, since the coal can be subjected to carbonization while being pressurized, even if carbonization is carried out at a lower temperature than the conventional one, the strength of coke does not decrease.

Further, in the coke producing method according to the present invention, while the coal is compressed intermittently with a compressive force of 1 to ² kgf / cm ² , the coal is carbonized at the final carbonization temperature of 750 to 900 ° C. to produce coke. The reason for doing so is as follows. That is, the continuous vertical coke oven used for coke production is equipped with an extruder and a coal pressure transfer machine, and when these equipments are exposed to a high temperature of 900 ° C. or higher, the life becomes extremely short, The upper limit of the temperature for dry distillation was set to 900 ° C. Moreover, the ultimate temperature of carbonization is 750
If the temperature falls below ℃, the coke does not undergo secondary shrinkage, so if it is subjected to heat treatment, it breaks into pieces and the air permeability of the blast furnace deteriorates, and the coke is destroyed during the process of conveying the coke. The value was 750 ° C.

The compressive force for coal is 1 to 2 kgf / cm.
The reason for setting ² is as follows. In other words, since the temperature for carbonization was lowered compared to the conventional method, when coke is produced under no load, the strength of coke is reduced.In order to maintain the strength of coke, it is necessary to compress it into coal during carbonization. It is necessary to carry out dry distillation while applying force, but 1 kgf / c
If it is less than m ² , the effect of increasing the strength is small and 2 kgf / cm ²
This is because the coal will be destroyed if it exceeds. Further, the reason why the compression is intermittently performed is that it has been confirmed by an experiment that the same effect of increasing the strength as that of the continuous compression is exhibited when the compression is intermittently performed especially in the initial stage of the carbonization.

Further, in the above-mentioned coke manufacturing method, the gas generated during coal carbonization is sucked and discharged from a plurality of positions in the vertical direction of the carbonization chamber. There is a possibility that the gas in the middle will aggregate and become tar, and hanging will occur,
Also, when gas is sampled from multiple points in the vertical direction of the carbonization chamber,
Different gases can be obtained compositions, and H ₂ gas rich of generated gas in the case of using H ₂ gas and so on to use the CH ₄ gas rich occurrence gas when utilizing the CH ₄ gas, the by-products This is because effective use can be achieved.

[0015]

EXAMPLE A continuous vertical coke oven according to one example of the present invention will be described with reference to FIG. A continuous vertical coke oven according to an embodiment of the present invention has a coal hopper 1 and a coal compression extruder 2 for charging coal in the upper part, and a carbonization chamber 3 continuously from the upper side to the lower side. And carbonization chamber 3
The combustion chambers 4 on both sides of are divided into a plurality of sections from the upper side to the lower side. And between the adjacent combustion chambers 4,
A plurality of coal press moving machines 5 that contact the both sides of the coal 23 charged in the carbonization chamber 3 and move downward while pressurizing the coal are arranged. An evolved gas recovery chamber 6 for recovering the evolved gas generated during the carbonization of coal is provided, and an evolved gas recovery pipe 7 connected to the evolved gas recovery chamber 6 causes generation of different compositions from the evolved gas recovery chambers 6. I try to recover the gas.

Since the continuous vertical coke oven of one embodiment of the present invention has the above-mentioned structure, when the coal 23 is carbonized to produce coke, the coal blending tank 31 is used.
The coal 23 is supplied to the coal hopper 1, the rotary feeder 8 provided in the lower part of the coal hopper 1 is operated, and the coal 23 is loaded into the carbonization chamber 3. Then, the coal compression extruder 2 is reciprocated to push the coal 23 downward of the carbonization chamber 3. In this way, the coal 23 is carbonized by the coal compression extruder 2 and is carbonized by the heat generated in the combustion chamber 4 and moves downward. Then, when the coal 23 reaches the place where the coal pressurizing mobile unit 5 is located, it is sent downward while being pressurized by the pair of coal pressurizing mobile units 5 provided opposite to each other. Furthermore, coal 2
When 3 reaches the coal pressure moving machine 5 arranged next, while being pressurized by the coal pressure moving machine 5 again, it is sent further downward.

In this way, the coal 23 continues to fall without staying in one place, and during that time, the dry distillation proceeds while being compressed. In addition to the above-described operation, the generated gas can be recovered from the generated gas recovery chambers 6 provided at a plurality of vertical positions through the generated gas recovery pipe 7, so that the generated gas is in the process of rising. Since it does not agglomerate and generate tar, hanging does not occur. Further, since the composition of the recovered generated gas differs depending on the recovery location, the generated gas can be effectively used. The coke produced in this way is cooled by the cooling gas in the lower fire extinguishing chamber 9 and discharged from the discharge port 10.

2 (a) to 2 (c) are side views showing various examples of the coal pressure transfer machine 5 described above. Figure 2 (a)
Is a type in which coal 23 is sent downward while being compressed by a pair of rolls 5a, and there may be a plurality of rolls 5a at one location and a plurality of locations may be provided. Figure 2
(B) is of a type in which coal 23 is sent downward while being compressed by a pair of endless chain belts 5b, in which case a pushing device for pushing the pair of endless chain belts 5b itself is required. FIG. 2 (c) shows that the coal 23 is directed toward the other furnace wall 3a and obliquely downward by the compression member 5c connected to the tips of a plurality of hydraulic cylinders provided on one furnace wall side of the carbonization chamber 3. It is a method of pushing in. In both types, the number of installation locations depends on the operating conditions of the coke oven.

Next, a coke manufacturing method according to one embodiment of the present invention will be described. In the coke manufacturing method of one embodiment of the present invention, as shown in the graph of FIG. 3 (a), the temperature of the furnace wall is increased stepwise from the upper part of the furnace to the lower part, and finally the temperature of the furnace wall is increased. The temperature is controlled so that the maximum temperature is 900 ° C. When controlled in this way, the temperature history from coal to coke becomes as shown in the graph of FIG. 3 (b), and the final distillation temperature reaches 750 to 800 ° C. Moreover, as shown in the graph of FIG. 4, coal is compressed intermittently (for example, at intervals of 30 minutes) with a compression force of 1 to ² kgf / cm ² .

In the coke manufacturing method of the one embodiment of the present invention, since the coke is manufactured by the method as described above, the life of the part of the coke oven exposed to high temperature can be extended without degrading the quality of the coke. it can. Figure 5
FIG. 4 is a graph comparing the quality of coke in the case of the conventional high temperature operation and the case of performing the method of the present invention under the operating conditions shown in Table 1.

[0021]

[Table 1]

The JIS drum strength (DI ³⁰ ₁₅ ) is almost unchanged or only slightly reduced. Further, although the JIS reactivity is slightly increased, it is understood that coke, which is the same as conventional coke, can be produced by medium- and low-temperature operation, not by the extent that the operation of the blast furnace is deteriorated.

Next, a coke manufacturing method which is an embodiment of the above-described coke manufacturing method according to one embodiment of the present invention will be described.
In this coke manufacturing method, while operating as described above, as shown in FIG. 6, the generated gas is recovered from the generated gas recovery chambers 7 provided at a plurality of positions in the vertical direction of the coke oven through the generated gas recovery piping 8. I try to recover the gas. By recovering the generated gas in this way, for example, as shown in Table 2, gases having different compositions can be recovered.
The generated gas can be used more effectively than before.

[0024]

[Table 2]

[0025]

As described above, according to the present invention, it is possible to continuously produce coke having the same quality as that of the coke produced in the chamber furnace type coke oven in the continuous vertical type coke oven without suspending the coke and at a low temperature. The equipment cost and repair cost can be reduced, and the building area occupied by the coke oven can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a continuous vertical coke oven according to an embodiment of the present invention.

FIG. 2 is a side view showing various examples of a coal pressure transfer machine.

FIG. 3 is a graph showing a temperature control method in the coke manufacturing method of one example of the present invention.

FIG. 4 is a graph showing a coal compression method in the coke manufacturing method of one example of the present invention.

FIG. 5 is a graph showing the quality of coke produced by the method of the present invention in comparison with coke produced by a conventional method.

FIG. 6 is an explanatory diagram showing a method of recovering generated gas in the coke manufacturing method according to the first embodiment of the present invention.

FIG. 7 is a vertical sectional view of a conventional continuous vertical coke oven.

[Explanation of symbols]

 1 Coal Hopper 2 Coal Compression Extruder 3 Carbonization Chamber 4 Combustion Chamber 5 Coal Pressurization Transfer Machine 6 Evolved Gas Recovery Chamber 7 Evolved Gas Recovery Pipe 8 Rotary Feeder 9 Fire Extinguisher 10 Discharge Port

Claims (3)

[Claims] 1. An extruder for charging coal is provided in an upper portion, the carbonization chamber is continuous from above to below, and the combustion chambers on both sides of the carbonization chamber are from above to below. A continuous vertical coke oven that is divided into multiple parts, characterized in that coal pressure transfer machines that move coal downward while pressing the coal at multiple points along the furnace length direction are provided on both sides of the carbonization chamber. A continuous vertical coke oven. 2. The continuous vertical coke oven according to claim 1 is used to intermittently compress coal with a compressive force of 1 to ² kgf / cm ^2, while the coal is retained at a final distillation temperature of 750 to 900 ° C. A method for producing coke, which comprises producing carbon by dry distillation. 3. The coke manufacturing method according to claim 2, wherein the gas generated during coal carbonization is sucked and discharged from a plurality of vertical positions in the carbonization chamber.