JPH07118662A - Production of coke for blast furnace - Google Patents

Abstract

PURPOSE:To provide a method for producing coke for a blast furnace in which non-caking coal can be used at a high ratio and response to diversification of raw material coal is made. CONSTITUTION:This method for producing high-strength coke for a blast furnace is to quickly heat coal prepared by blending >0 to <=60-wt.% non-caking coal with <100 to >=40wt.% caking coal to a prescribed temperature in a temperature region of the softening-starting temperature of the coal to a temperature lower than the softening-starting temperature by 50'C at >=100 deg.C/min heating rate, then hot briquette the coal in a state thereof kept in the temperature region under >=kg/cm<2> pressure, subsequently charge the briquetted coal into a carbonization furnace and carbonize the briquetted coal to 700-1000 deg.C temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing blast furnace coke. More specifically, the present invention relates to a method for producing blast furnace coke, which enables a large amount of non-caking coal to be used in the production of coke and thereby expands the type of coal.

[0002]

2. Description of the Related Art Conventionally, a blast furnace coke is shown in FIG.
It is manufactured using an apparatus having a configuration as outlined in. That is, first, a certain amount of coal, which has been finely pulverized and whose particle size has been adjusted in advance, is loaded into a charging vehicle 51 on the carbonization furnace 50, into a carbonization chamber 52 of the carbonization furnace, and a charging port 53 above the carbonization chamber 52. It is charged from. The temperature of coal at the time of charging is normal temperature (20 to 30 ° C). In the carbonization furnace 50, the carbonization chamber 52
The air and poor gas or rich gas (not preheated) preheated in the refractory brick heat storage chamber 54 in the lower part of the table rise to the upper part and are burned in the combustion chamber 55. The flue temperature at this time is usually about 1200 to 1350 ° C.
The carbonization chamber 52 and the combustion chamber 55 are partitioned by a wall made of silica stone and are alternately arranged, and the combustion heat of the combustion chamber 55 is transferred to the coal in the carbonization chamber 52 through the silica stone brick.
The carbonization in the carbonization chamber 52 is performed until the coal is heated to about 1000 ° C. After that, the furnace lids on both sides of the carbonization chamber 53 are opened, and the rack 57 installed in the extruder 56 pushes out the generated red hot coke. The extruded coke is loaded into the coke bucket 59 through the grid of the coke guide wheel 58 and then guided to the coke dry fire extinguisher (CDQ) 60 by a train (not shown),
The CDQ60 is contacted with an inert gas, cooled to about 200 ° C., and taken out.

By the way, as a raw material for blast furnace coke in such a conventional method, strong coking coal is mainly used in view of quality restrictions of blast furnace coke, and lack of flexibility in expanding coal types. That is, since non-caking coal is cheaper than caking coal and is present in large amounts on the earth, increasing the proportion of use as a raw material for coke is an important resource-related issue. However, even if a small amount of non-caking coal was used as a part of the coke raw material, the non-caking coal had a poor caking property, so that the coke strength was significantly deteriorated.

In order to use non-caking coal as a raw material for coke for blast furnace, non-caking coal or various coals containing the same are crushed and blended, and a binder such as tar and pitch is added and pressure-molded. Method of using modified coal (for example, JP-A-48-321)
No. 02, JP-A-56-10329, etc.) are known. However, in these methods, non-caking coal itself is not reformed only by physically supplementing the caking coal with tar and the like having too much caking. For this reason, when a large amount of non-caking coal is used, a large amount of expensive tar is also required, which not only poses an economic problem, but also causes partial swelling of the coke due to the excessively caking tar, resulting in coke swelling. The strength and homogeneity were deteriorated.

Further, JP-A-58-122982 discloses about 40 to 80% by weight of non-caking coal and about 60 to 2 of caking coal.
Coal consisting of 0 wt% is rapidly heated to a predetermined temperature of 300 to 530 ° C. under a hydrostatic pressure of about 1 to 15 atom to be softened and melted, and a pressure of 20 kg / cm ² or more is further applied to hot mold the temperature. For 1 hour or less, and then in a shaft furnace, the temperature is raised to a maximum carbonization temperature of about 700 to 1000 ° C. at a heating rate of about 12 ° C./min or less, and then 3
A process of continuously cooling to below 00 ° C has been proposed. As a result, it is intended to reduce the difference in the heat pattern of coal in the carbonization furnace at each site, to produce coke of uniform quality, and to shorten the time required for production. Further, it is intended to increase the caking property of non-caking coal by rapid heating and increase the usage rate of non-caking coal as a coke raw material.

However, in this method, the coke particle size obtained is uniform, and coke having a conventional particle size distribution cannot be obtained.

Rapid heating of coal is carried out in the field of producing gas and tars by rapid thermal decomposition of coal, and is usually rapidly heated to about 700 to 1000 ° C. (for example, "Fuel Association"). Magazine "67th
Vol. 1, No. 1 (1988), pp. 14-27). Japanese Unexamined Patent Publication (Kokai) No. 5-9477 proposes to bring the vapor of a hydrogen donating solvent into contact with the vapor at 70 to 200 ° C. and then rapidly heat it to 500 to 900 ° C. in an inert gas or hydrogen gas atmosphere. .

Further, in order to improve the spontaneous pyrophoricity and hygroscopicity of non-caking coal, a technique of rapidly heating to 180 to less than 300 ° C. to decompose hydrophilic oxygen-containing groups in coal (Japanese Patent Publication No. 53-13198). (Gazette) is also proposed.

However, none of these techniques is intended to improve the coking property or caking property of non-caking coal. The former has a final heating temperature of 500 ° C. or higher and the latter has a final heating temperature of 300 ° C. or lower. This is essentially different from the rapid heating in the present invention as described later.

[0010]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an improved method for producing blast furnace coke, which can solve the above-mentioned problems in the prior art. The present invention also improves the caking property of non-caking coal and maintains the desired coke strength, while producing a blast furnace coke which enables an increase in the proportion of non-caking coal used as coke raw coal. The purpose is to provide a method.

[0011]

Means for Solving the Problems The above-mentioned objects are solved by rapidly heating raw coal to a temperature just before its softening start temperature to improve the caking property of coal.

That is, the present invention provides (1) softening of coal obtained by blending non-caking coal in an amount of more than 0% by weight to 60% by weight and less than 100% by weight to 40% by weight or more. When the starting temperature is T _s , the temperature t of the coal is T _s
Rapid heating is performed at a heating rate of 1 × 10 ² to 1 × 10 ⁶ ° C./min until reaching a predetermined temperature within a temperature range of> t ≧ (T _s −50), and then 0 is maintained in the above temperature range. 1-1
This is a method in which after hot forming at a pressure of 000 kg / cm ² or more, it is charged into a dry distillation furnace and dry distilled to a temperature of 700 ° C to 1000 ° C.

The present invention also provides (2) 0% by weight of non-caking coal.
A predetermined coal whose temperature t is within the temperature range of T _s > t ≧ (T _s −50) is obtained by blending coal containing more than 60 wt% or less and caking coal of less than 100 wt% to 40 wt% or more. Rapid heating is performed at a heating rate of 1 × 10 ² to 1 × 10 ⁶ ° C / minute until the temperature is reached, and then the material is charged into a dry distillation furnace to 700 ° C to
It is a method of dry distillation to a temperature of 1000 ° C.

In the present specification, the "softening start temperature" (T _s ) of coal means the softening start measured by a rapid heating type plastometer at a heating rate of 1 × 10 ² to 1 × 10 ⁶ ° C / min. Is the temperature. Further, the temperature of coal in the carbonization furnace indicates the temperature of coal in the central portion of the coke oven unless otherwise specified. Further, the term "non-caking coal" used in the present specification is a sub-bituminous coal or a lignite coal classified as a low-grade coal having a caking property inferior to that of a caking coal generally used as a blast furnace coke raw material. It means that all such things are included.

[0015]

[Operation] The carbonization reaction of coal is assumed to consist of the sequential reactions of coal → metaplast → semi-coke.
"Metaplast" is a low molecular weight substance resulting from depolymerization of coal and causes softening of coal. Here, transformation reaction from coal to metaplast (metaplast formation reaction)
Is a k ₁ reaction, and the transformation reaction from metaplast to semi-coke (metaplast disappearing reaction) is a k ₂ reaction.
When the coal is heated, these k ₁ and k ₂ reactions occur successively and the coal becomes coke. In the reaction process, the metaplast produced by the k ₁ reaction is the next k ₂
In consideration of the disappearance rate due to the reaction, as shown in FIG. 2, it exists at a certain concentration in a certain temperature range. This causes the coal to soften and become caking.

Conventionally, when normal temperature coal was charged into a carbonization furnace, the heating temperature was about 3 to 10 ° C./minute, but in the present invention, it is 1 × 10 ² to 1 × 10 ⁶ ° C. The coal is heated rapidly as a heating rate of / min. When the coal is rapidly heated, the time during which the k ₁ reaction takes place at each temperature is shortened, so the temperature rises before the reaction proceeds sufficiently. As a result, when coal is rapidly heated, there is a temperature range in which metaplast appears rapidly.
Therefore, a large amount of metaplast is present, and since the metaplast is formed at a temperature higher than the normal heating rate,
It will have a lower viscosity and improve caking properties. It should be noted that non-caking coal is more likely to be affected by rapid heating than caking coal, which greatly contributes to an increase in the proportion of non-caking coal used. Further, the rapid heating increases the generation rate of tar and gas per unit time, and thus the tar concentration in the coal particles increases due to the restriction of the diffusion rate in the coal particles. This phenomenon also contributes to the improvement of the caking property by rapid heating.

However, in the present invention, the temperature t of the coal is T _s > t ≧ (T _s −5 because of such rapid heating.
The heating is performed until the temperature reaches a predetermined temperature within the temperature range of 0), that is, the state just before the start of softening and melting. By rapidly heating to a high temperature, for example, a temperature above the softening start temperature by the rapid heating as described above and bringing it to a softened and molten state, the reaction rate of the k ₂ reaction, which is the disappearance reaction of metaplast, is accelerated, and the k ₁ reaction Since the generated metaplast disappears and becomes semi-coke, the concentration of metaplast that contributes to the improvement of the caking property is already lowered when the metaplast is charged into the carbonization furnace, and the desired coke strength cannot be expected. In the present invention, rapid heating is performed until the metaplasts are about to be formed immediately before the softening start temperature, and the metaplast concentration is maximized after charging the dry distillation furnace.

Further, in the present invention, the coal thus rapidly heated to just before the softening start temperature is hot-formed while maintaining the temperature, if necessary. By molding, handling of the powder in a state close to a semi-molten state can be facilitated, and environmental effects such as dust, NO _x and SO _x can be reduced, and the coke strength can be improved. The k ₂ reaction, which is the reaction of metaplast annihilation, is affected not only by the above-mentioned temperature factor but also by a temporal factor at a certain temperature or higher, and therefore, as quickly as possible after being rapidly heated to just before the softening start temperature. It is desirable to charge it to a carbonization furnace.

Due to the improvement in the caking property of coal due to the rapid heating, it is possible to increase the use ratio of non-caking coal as a raw material for coke for blast furnace, and to use 10% by weight of the conventional raw material. It is possible to maintain the coke quality almost equal to what has been the limit to about 60% by weight.

The present invention will be described below in more detail based on the embodiments shown in the drawings.

FIG. 1 is a schematic view showing the structure of an example of an apparatus used in the method for producing blast furnace coke according to the present invention.

In order to produce a blast furnace coke according to the present invention using this apparatus, first, the coal is crushed in advance by a conventional method and the particle size is adjusted. Although it varies depending on the type of coal, for example, the particle size of 3 mm or less is adjusted to be about 100%. As coal, non-caking coal can be used in a high blending ratio. Specifically, for example, caking coal is less than 100% by weight to 40% by weight or more and non-caking coal is more than 0% by weight to 60% by weight or less, preferably 90% by weight to 50% by weight and non-caking coal. Caking coal 10% to 50% by weight, more preferably caking coal 70% by weight
To 60 wt% and non-caking coal 30 wt% to 40
% By weight. The increase in the use rate of non-caking coal means that
It is desirable economically and from the viewpoint of effective use of resources, but if the amount of non-caking coal used exceeds 60% by weight, the quality of the coke obtained may not be sufficient. This is because it is large.

The coal thus pulverized and adjusted in particle size is first charged into the dryer 21. This dryer 21
The exhaust gas at 300 to 400 ° C. from the carbonization furnace 10 is introduced from below as a heat transfer gas, and the pulverized coal charged in the dryer 21 is transported to this exhaust gas and rises, It is preheated by the sensible heat of the exhaust gas and dried to a water content of 1% by weight or less.

The preheated and dried coal is separated from the exhaust gas by a collecting device (not shown) such as a cyclone, and is carried to the preheater 22 through an appropriate transportation means. The pre-heater 22 has the same air flow heating system as the dryer 21, and as the heat medium gas,
900 to 1 produced by mixing and burning air or exhaust gas from the carbonization furnace 10 with a fuel such as kerosene in the hot-blast stove 23
Combustion exhaust gas at 000 ° C. is used.

The coal charged in the preheater 22 is
By coming into contact with the combustion exhaust gas in the pre-heater 22, the coal is further rapidly heated, and the softening start temperature T of the coal is increased.
The temperature immediately before _s , specifically, the temperature t of coal is T _s > t ≧
(T _s −50), more preferably T _s > t ≧ (T _s −4)
0), and more preferably within the temperature range of T _s > t ≧ (T _s −20). When the temperature is equal to or higher than the softening start temperature T _s due to the rapid heating, as described above, the metaplast that contributes to the caking property of coal has already disappeared when it is charged into the carbonization furnace, and the strength of the coke obtained is sufficient. such as the not, on the other hand, if it is a temperature lower than the lower 50 ° C. above the softening initiation temperature temperature _{[(T s -50) ℃]} , not the expression level of Metapurasuto is a sufficient, the resulting coke There arises a problem that qualities such as homogeneity and strength are not satisfactory.

The heating rate immediately before the softening start temperature of coal, particularly from 300 to 450 ° C. to immediately before the softening start temperature, is 1 × 10 ² to 1 × 10 ⁶ ° C./min, preferably 1 × 10. ² to 1 × 10 ⁵ ° C / min. That is, if the heating rate of coal is less than 100 ° C./minute, the improvement of the caking property of coal will not be sufficient. On the other hand, the upper limit is 1 × as the industrially feasible heating rate.
10 ⁶ ° C / min. In addition, in this embodiment, heating of the coal from room temperature to 300 ° C. is performed by the dryer 2.
1 and from 300 ° C. to a temperature just before the softening start temperature is performed by the pre-heater 22. In this case, the temperature from 300 to 450 ° C. to a temperature just before the softening start temperature is 1 × 10 ⁴ to 1 Rapid heating at a heating rate of about × 10 ⁵ ° C / min is more desirable from the viewpoint of improving the quality of coke obtained.

Of course, heating up to just before the softening start temperature of coal is not performed in two steps as in the present embodiment as long as the heating rate of 1 × 10 ² to 1 × 10 ⁶ ° C./min can be maintained. Even if you use only one heating device,
Alternatively, it can be performed in multiple stages.

It is desirable that the heating of the coal just before the softening start temperature is carried out in an inert atmosphere. In the present embodiment, the oxygen concentration is less than 1% by volume from the viewpoint of thermal efficiency and economical efficiency. More preferably, the combustion exhaust gas from the dry distillation furnace or the hot-blast stove, which is about 0.5% by volume, is used, but it is also possible to use nitrogen heated by using a heat exchanger or the like. Further, as the heating device, not only an air flow contact type but also a fluidized bed or the like can be used.

Next, the coal heated to a temperature just before the softening start temperature by the pre-heater 22 is separated from the heat medium gas by a collecting device (not shown) such as a cyclone, and molded through an appropriate transportation means. It is transported to the machine 24 and hot-formed and agglomerated while maintaining its temperature state. A roll molding machine is used as the molding machine 24, but other types such as a stamp molding machine may be used.
The molding pressure, 0.1~1000kg / cm ^2, preferably desirable about 10~1000kg / cm ^2.
Such agglomeration is expected to improve handling properties in the subsequent transportation process and the like, improve environmental problems due to scattering of pulverized coal into the atmosphere, and improve coke quality. The upper limit of molding pressure is 100
The reason for setting 0 kg / cm ² is to prevent damage to the coke oven body due to expansion of the formed coal after the formed coal is fed into the dry distillation furnace and heated. In this embodiment, hot molding is performed after heating to a temperature just before the softening start temperature in this way, but in the present invention, such a hot molding step can be omitted, and the handling is performed. Although it is inferior in terms of environmental performance and environmental friendliness, it is possible to produce coke of approximately the same quality by such a process that omits hot forming, and also in terms of economic efficiency such as energy consumption and capital investment. Of course, it is advantageous.

The hot-molded coal heated to a temperature just before the softening start temperature is fed from the molding machine 24 to the carbonization furnace 1.
It is supplied to the hopper 11 provided at the charging port 13 opened at the upper part of the carbonization chamber 12 of 0. In addition, it is desirable that the conveying path from the dryer 21 to the hopper 11, that is, the path from the rapid heating of the coal to the hot forming to the charging into the carbonization chamber of the carbonization furnace is a closed system. It is preferable that the system has an adiabatic or heat retaining structure so that an inert gas is circulated and the predetermined temperature of the coal to be conveyed is maintained. By making such a closed system,
The coal spontaneously ignites in contact with an oxidizing gas such as air, and the generated dust, NO _x , SO _x, etc. are released into the atmosphere, and the active components in the coal produced by rapid heating are oxidized. It is possible to effectively prevent deterioration of the quality of coke obtained as a result of reaction with the volatile gas.

The coal hot-molded by heating to a temperature just before the softening start temperature is charged into the carbonization chamber 12 from the hopper 11 at a predetermined time interval, that is, at a predetermined amount in each cycle of the carbonization in the carbonization furnace 10. It As described above, the coal heated to the temperature immediately before the softening start temperature is,
The caking component (metaplast) reacts with the passage of time to form coke, and after a long period of time, for example, one hour or more, before being charged into the carbonization chamber 12, the strength of the coke obtained is significantly reduced. Therefore, it is desirable to charge the carbonization chamber 10 within 0.5 hours, more preferably within 20 minutes after heating to the temperature just before the softening start temperature.

In the carbonization furnace 10, air and poor gas or rich gas (not preheated) preheated in the refractory brick heat storage chamber 14 below the carbonization chamber 12 rises to the upper portion and is burned in the combustion chamber 15. . The carbonization chambers 12 and the combustion chambers 15 are partitioned by, for example, a refractory wall surface such as silica brick and arranged alternately, and the combustion heat of the combustion chambers 15 is transferred to the coal in the carbonization chambers 12 through the wall surfaces. . Carbonization chamber 1
Since the coal charged in No. 2 has already been uniformly heated to a temperature immediately before the softening start temperature, specifically, a temperature of, for example, about 300 to 450 ° C., in the subsequent carbonization in the carbonization chamber 12, the furnace wall It can be heated almost uniformly without causing a large temperature difference between the vicinity and the center of the furnace. The carbonization in the carbonization chamber 12 is continued according to a conventional method until the temperature of the coal reaches a predetermined temperature within the range of 700 to 1000 ° C., and when it reaches the predetermined temperature, it is kiln-fired.

After that, the furnace lids on both sides of the carbonization chamber 13 are opened,
The rack 17 installed in the extruder 16 extrudes the produced red hot dry carbonization coke. The extruded coke is loaded into the coke bucket 19 and then guided to the CDQ 20 by a train (not shown). In addition, it is desirable that the coke is taken out of the kiln and transported to the CDQ 20 in a closed system from the viewpoint of improving the environment. And CDQ2
After being cooled to 200 ° C. or lower by an inert gas such as nitrogen flowing through the CDQ in 0 according to a conventional method, it is taken out of the system. Note that the gas used for cooling the coke is circulated and used after undergoing steps such as capture and separation of soot dust and combustible components, heat recovery by heat exchange with boiler water of a power generation boiler, and the like.

The coking of coal does not necessarily have to be carried out by raising the temperature to the final heating temperature in the dry distillation furnace as described above, and the kiln is taken out when the temperature reaches about 600 to 900 ° C. The low temperature carbonized coke discharged from the kiln is brought into contact with an oxidizing gas such as air or oxygen to burn the residual volatile components of the coke, and the coke is heated to at least 900 ° C.
It may be carried out by cooling after heating up to. Such low temperature kiln removal makes it possible to shorten the dry distillation time and reduce the energy used. If the coke temperature is lower than 600 ° C., which is lower than that, the coke agglomerates do not have sufficient strength, and a problem of pulverization occurs in the subsequent transportation step. The heating by burning the residual volatile components of the coke after the low temperature kiln is heated by, for example, improving the CDQ20 and introducing an oxidizing gas from the outside to bring it into contact with the prechamber 25 in the upper stage of the CDQ20. Done. Since this heating is performed directly by partial combustion of the coke, there is no difference in temperature within the coke mass, and uniform heating is performed and quality is homogenized. In this way, after heating to at least 900 ° C. by partial combustion in the pre-chamber 25, the cooling chamber 26 in the lower stage of the CDQ 20 immediately starts.
And is cooled to 200 ° C. or lower by an inert gas in the same manner as described above, and then taken out of the system.

In addition to the above, it is also possible to improve the coke bucket and provide an oxidizing gas introducing mechanism in the coke bucket to partially burn the coke in the coke bucket.

[0036]

EXAMPLE FIG. 3 shows the strength of coke produced based on the method according to the present invention as described above in a test plant by changing the blending ratio of coking coal and non-caking coal in coke raw coal and the conventional value. It is a graph which shows an example of the strength of the coke manufactured based on the tar addition method as an example. In the method according to the present invention, the sample was rapidly heated to (Ts-20) ° C. at a rate of 10 ⁴ ° C./min., The present invention example 1 was used without hot molding, and the present invention example 2 was 1.0 kg / cm.
² , after hot forming at 390 ℃, heated in a carbonization furnace with a furnace width of 450 mm until the temperature of the coal reaches 800 ℃, after kiln CD
It was cooled by extinguishing with Q. On the other hand, as a conventional example,
Tar (softening point 25 ° C.) corresponding to 10% of the weight of non-caking coal was added to the caking coal and kneaded, and after preheating to 220 ° C., the temperature of the coal was changed in the same carbonization furnace as above. Is 80
It was heated to 0 ° C., fired in a kiln, and then extinguished and cooled by CDQ. As is clear from the results shown in FIG. 3, according to the method of the present invention, the coke strength (DI) is maintained at a predetermined level of 80% or more even when the proportion of non-caking coal used is 60% by weight. It was possible. Note that T _s = 390
It was ℃.

[0037]

As described above, according to the present invention, only caking coal is used by greatly improving the caking property of coal, especially non-caking coal, by rapid heating until just before the softening start temperature. It is possible to obtain coke having almost the same quality as that obtained by the conventional method even with a high usage rate of non-caking coal, and it is possible to cope with the diversification of raw coal. It is possible, and a reduction in raw material cost can be expected.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing the configuration of an example of an apparatus used in the method for producing blast furnace coke according to the present invention,

FIG. 2 is a diagram schematically showing the relationship between temperature and the amount of existing components in the heating process of coal,

FIG. 3 is a diagram showing the relationship between the use ratio of non-caking coal and the strength of coke in the production method of the present invention and the conventional method,

FIG. 4 is a diagram schematically showing the configuration of an example of an apparatus used in a conventional method for producing blast furnace coke.

[Explanation of symbols]

10 ... Dry distillation furnace, 11 ... Hopper, 12
… Carbonization chamber, 13… Charging port, 14… Heat storage chamber,
15 ... Combustion chamber, 16 ... Extruder, 17 ... Rack, 19 ... Coke bucket, 20 ... Coke dry fire tower (CDQ), 21 ... Dryer, 2
2 ... Pre-heater, 23 ... Hot air stove, 24 ...
Molding machine, 25 ... Pre-chamber, 26 ... Cooling chamber, 50 ... Dry distillation furnace, 51 ... Charging vehicle,
52 ... carbonization chamber, 53 ... charging port, 54 ... heat storage chamber,
55 ... Combustion chamber, 56 ... Extruder, 57
... rack, 58 ... coke guide car, 59 ... coke bucket, 60 ... CDQ.

Claims (2)

[Claims] 1. Non-caking charcoal is more than 0% to 60% by weight.
Hereinafter, the coal containing less than 100% by weight to 40% by weight or more of coking coal is brought to a predetermined temperature within a temperature range from the softening start temperature of the coal to a temperature 50 ° C. lower than the softening start temperature of the coal. 10 ^2-1
Rapid heating at a heating rate of × 10 ⁶ ° C / min, and then 0.1 to 1000 kg / c with the above temperature range maintained.
A method for producing coke for a blast furnace, comprising hot forming at a pressure of m ² and then charging into a dry distillation furnace and performing dry distillation to a temperature of 700 ° C. to 1000 ° C. 2. Non-caking charcoal is more than 0% to 60% by weight.
Hereinafter, the coal containing less than 100% by weight or 40% by weight or more of coking coal is brought to a predetermined temperature in a temperature range from the softening start temperature of the coal to a temperature 50 ° C. lower than the softening start temperature of the coal. And 1x1
A method for producing a coke for a blast furnace, which comprises rapidly heating at a heating rate of 0 ² to 1 × 10 ⁶ ° C / min, then charging into a dry distillation furnace and performing dry distillation to a temperature of 700 ° C to 1000 ° C.