JPH02500196A - Coke manufacturing method - Google Patents

Abstract

A method of obtaining coke includes thermal treatment of disintegrated coal charge, its coking and cooling down of the obtained coke. The thermal treatment of the coal charge is effected by mixing it with the coke at a temperature of 600-1000 DEG C at a weight ratio between the charge and the coke equal to 1.3-2.6:1 and in direct-flow regime, so that the coke is cooled down to a temperature of 150-250 DEG C and the charge is heated to 120-240 DEG C. After termination of the heat exchange process the coal-coke mixture is separated into the cooled coke and the charge. The heated charge is then used for coking.

Description

[Detailed description of the invention] Coke manufacturing method (Field of industrial application of the invention) TECHNICAL FIELD This invention relates generally to the coke chemical recovery industry. More specifically, the invention relates to steel This invention relates to a method for producing coke used in industry.

(Conventional technology) Until recently, pulverized coal charges with initial moisture content in the range of 8-10% were carbonized; Coke production methods are known that involve subsequent wet digestion of the produced coke. It was commonly used.

While considerable sources of regular coke were still available in the absence of energy shortages , this traditional coke production method met the requirements of by-product coke industry.

A good monthly coke deposit reduction will result in a quality coke that meets the demands of the steel industry. stimulated research and development of new methods to enable the production of

The problem of waste heat recovery associated with the coke extinguishing process has been a topic of concern to engineers for over 40 years. It has been thought that After all, the amount of heat lost by the steam during extinguishing is the coke. It varies between 350,000 and 370,000 Kcal per ton of carbon, which is This is because it corresponds to about 50% of the total amount of heat required for the chemical process. The coke technique Coke Engineer's Handbook Editor, A., Shelkov, vol. 2, 1965, p. 173 (see ).

The latest carbonization technology is the preheating of coal charge before carbonization, the preheated coal charge carbonization with subsequent cooling of the coke thus obtained using a dry cooling method. It's in the method. Since monthly sources of coke have become almost unobtainable, this method Provides improved coke quality, increases coke oven throughput and reduces power consumption. Ru.

The gist of the above method is to prepare pulverized coal with an initial moisture content in the range of 8-10%. dryer (for example, rotary tube dryer, fluidized bed dryer, Cercha r) heat transfer of the gas produced in another device (furnace) in a dryer, heat exchange drum, etc.) Drying and preheating by gas flow, then preheating to 120-250℃ The process involves charging the coal into a coking chamber where carbonization occurs. (Magazine “Guruyunkau” GIMckauf, No. 6, 1973, Essen.

Federal Republic of Germany, “Precarbon: Novel Processing of Preheated Coke Monthly” Precarbon: a Novel method of Proce ssingof Preheated Coking Coals)”W, Rode, C-G, Beck, Germany, pp. 28-39 , Magazine “Koks i Khimia” No. 9, 1 975, Moscow, Soviet Union: ``Drying and cooling technology for coal feed into semi-commercial water supply'' Bringing the Dry Cooling Tech nology of Coal Charge to asemi-co+sm ercial Level)''B, 1. Written by Babanin et al., 9 (See USSR, p. 12).

Coke at 1000-1050℃ is discharged from the coke oven chamber and placed in the dry cooling chamber. where the coke sensible heat is transferred to the waste heat boiler with the help of an intermediate inert gas. It will be collected. The steam generated in the above boiler meets the energy requirements. used for.

(“Coke Technology Handbook”, General Editor, A., Shelk ov) + vol. 1, 1965, pp. 173-175).

The above coke production method was found to be extremely efficient.

Preheating the pulverized coal charge increases the bulk density of the coal charge.

This in turn leads to an increase in coke oven throughput and poor coke production in the charge. This expands the range of coals suitable for carbonization.

Additionally, preheating the coke charge improves the carbonization conditions, which leads to a more uniform size. Drying and cooling of the coke and subsequent sensible heating of the coke to give it a coke and increase its strength. recovery allows the second energy source of coke to be fully utilized. .

At 1000℃ in the upper part of the dry cooling chamber (pre-combustion chamber (pre-cbaa+ber)) Isothermal residence of coke results in stabilization of coke properties, during which slow cooling rates occur. cooling (without thermal shock as in wet extinguishing) is advantageous for coke strength; ensure a more uniform size of the space.

However, implementation of this method was found to be disadvantageous due to several reasons .

When the pulverized coal mixture is being preheated by the heat transfer gas, fine coal dust Some of the feed in the form of The other part is carried by the circulating heat transfer agent to the furnace where it is completely combusted.

This in turn requires the organization of purification operations, which in turn produce large amounts of chemically contaminated water. With accumulation, it has to be purified, so that environmental protection problems are completely eliminated. Not resolved.

The coke contains 65 coking chambers, each coking chamber having a volume of 41.6 m'' When produced in a single coke oven with a heat transfer agent of about 50. OOOnm ”/hour, and contains about 0.3% carbon monoxide, other toxic components and small (both containing fine coal dust in an amount of 505 g/nm).

As soon as incandescent coke at 1000-1050°C comes into contact with gas during cooling, the coke The gas begins to burn.

The need to create additional equipment needed to preheat the charge and cool the coke. and the concomitant need to attract additional personnel for these devices increases capital costs and This significantly increases manufacturing costs.

Coke production methods that involve preheating the feed and drying and cooling the coke are economically justified. Despite the fact that This prevents similar commercial implementation.

The above-mentioned problems inherent in prior art methods of preheating the coal charge and cooling the coke Resolving this will be a high priority task.

(Detailed description of the invention) The present invention enables the use of coal that was previously considered unsuitable for carbonization. In view of this, increasing process productivity, eliminating coke loss and reducing air pollution and to provide a coke production method that makes the process simpler and cheaper. purpose.

The above object, according to the present invention, allows the pulverized coal charge to maintain a temperature of 600-1050°C. The coal charge is preheated by being mixed with coke, and the The mass ratio is 1.3:1-:2 during their conflow. s = 1 This reduces the coke temperature to within the range of 150 to 250℃. , on the other hand, the temperature of the coal charge increases within the range of 120-240℃, and the coke and coal charge temperature increases. After completing the heat exchange with the coal charge, the mixture of coke and coal charge is coke. The preheated stone is divided into a coal charge and a coal charge, and the temperature is 120 to 240℃. Preheating of the crushed coal charge, characterized in that the coal charge is sent to a coking chamber; This is accomplished by providing a coke production process that includes its carbonization and cooling of the coke.

It is recommended to use coke lumps with a minimum size of 10 days. this is Classification process of coke and coal charge mixture after heat exchange process is completed facilitates better and more complete isolation of coke.

In addition, the preheated pulverized coal charge should be sieved into two sizes. is recommended. One of these two parts is composed of coal particles smaller than three centimeters in size. The other two fractions are composed of particles with a size exceeding 31, and the sieve fraction later becomes 3fi. The percentage made up of particles with a size exceeding crushed and mixed with a previously separated coal charge consisting of particles of size 31 or less. The resulting mixture is then sent for carbonization. This is the raw material for coal preparation. It provides improved coking properties and improves the quality of the coke produced.

9 Since the moisture content of the initial coal charge can vary, the coal charge is Heated coke with the addition of some water injected in an amount of 10 to 80 g/ton. mixed. This stabilizes the heat exchange process.

The initial coal charge has a Froude number (Fr) value of 0.015 to 0. ．． 2 (where Fr is the product of the square of the rotational speed and the diameter of the heat exchanger versus the weight) is the ratio of the product of the force acceleration and the average size of the coke lump), and the P value is (1,5 to 10 )・10-6 (where P is the rotational speed of the heat exchanger and the coal charge loading) The product of quantity versus heat exchanger diameter, heat exchanger length, bulk density of coal charge and gravitational acceleration. ), and the α value is within the range of 0.15 to 0.4 (where α is the ratio of the heat exchanger degree of fullness) mixed with the heated coke in a heat exchanger essentially as a rotating drum. It is a good idea to This improves the heat exchange efficiency between the coal charge and the coke. It increases the wear resistance of coke and prevents fine coal particles from being overheated. Ru.

The coke production method proposed here reduces invested capital, increases throughput, and increases coke production. Eliminates monthly and coke losses, significantly reduces environmental pollution, and improves coke quality. make it possible to improve.

The reduction in invested capital and the increase in throughput are due to the preheating of coal charge and the cooling of coke. This is achieved by the fact that it is combined into a single process. With this integration, One device is required for preheating the coal charge and another for drying and cooling the coke. one device instead of two used in prior art methods requiring It is sufficient to simply place the

According to the method proposed here, the reduction of coke monthly and coke loss is Conditions that result in the combustion of the coal charge and coke and are inherent in prior art processes. This is achieved through the elimination of problems.

According to the method proposed here, the reduction of environmental pollution is due to the fact that this method does not emit into the atmosphere. This is achieved by the fact that it eliminates the need to use heat transfer gas . By evaporation of the moisture contained in the coal charge, according to the previously proposed method Only the water vapor produced is released into the atmosphere.

(Brief explanation of the drawing) These and other advantages of the invention will be apparent from the following detailed description with reference to the accompanying drawings. 0 drawings are presented here so that it may be more clearly understood.

The main diagrams of the proposed coke production method are shown.

(BEST MODE FOR CARRYING OUT THE INVENTION) After being discharged from the coke oven 1, the incandescent coke is transported along a pipe 2 to a storage bin. 3, where the coke with a temperature of 1000-1050°C is heated under isothermal conditions. will be held for a while. This stabilizes the temperature throughout the entire bulk of the coke. This improves coke strength by ensuring that thermochemical reactions proceed properly. Ru.

From the bin 3, the coke is sent in a continuous flow along the pipe 4 to the device 5 where the coke is sieved into two It is classified into hundredths of size. That is, one fraction contains coke with a size of 10 fl or less. The other fraction contains coke powder that makes up the particles of the Coke powder in an amount of 4 to 8% of the total coke bulk, including coke lumps, is known Cooling using one of the following methods (e.g. wet extinguishing, evaporation or conductive heat exchange) It is sent along piping 6 for disposal. Sieve from W5 at a temperature of 600 to 1050℃. The coke having a certain temperature is sent along a pipe 7 to a heat exchanger 8. proposed here The method can be performed using any heat exchanger of any construction that allows mixing of the coal charge and coke, e.g. For example, it can be carried out in a rotating drum heat exchanger or the like. A pipe 10 is connected to the heat exchanger 8 from the bottle 9. The initial coal charge that is sent along the 1.3:1 to 2.6:1 depending on the requirements placed on the final temperature obtained after heating is supplied in such a quantity as to give a coal to coke mass ratio of . Inside heat exchanger 8 Once the coal charge and heated coke are mixed together, the heat generating surface and The temperature difference on the heat-absorbing surface and the shielding effect caused by water vapor reduce the coke mass to 150%. 250°C, while the temperature of the coal charge was simultaneously 120-240°C. The temperature is raised to within 0°C.

Heat exchange between coal charge and coke occurs rather slowly (within 5-7 minutes). Koru. Therefore, the bulk of the coal charge, which is characterized by lumps of different sizes, is rather uniform. This causes overheating of the particles, decomposition of the coal, and transfer of the coal particles to the surface of the coke lump. Prevents sticking. This is based on the physical and chemical properties of the feed and its coking ability. make it possible to hold.

Since the coke mass cools fairly slowly, it is usually This gives a more uniformly sized coke mass and the coke is free from the thermal shocks encountered. increase the core strength.

The coke is subjected to mild mechanical treatment while being mixed with the coal charge during heat exchange. This also increases coke strength. When the heat exchange is completed, the coal and coke The mixture is subjected to size separation on a device 11. used for heat exchange The size of the coke lump is more than 100, and the size of the coal charge particles is less than 100. Sieving completely separates the preheated coal from coke due to the fact that allow for isolation.

During the mixing process, some of the coke powder enters the coal charge as a result of mechanical treatment.

However, this does not deteriorate the coking properties of the charge.

When the sieve fraction is discharged from the device 11, the cooled coke mass is discharged along the pipe 12. The sieve fraction is sent for further processing as a finished product, while the preheated coal charge The material is sent along pipe 13 to a separating device 14 where it is separated into two sizes, viz. Divided into the fraction of particles with a size of 3 cranes or less and the percentage of particles with a size of more than 3 days. Ru. Coal charge containing particles with a size of 3 cranes or less is passed through a carbonization cord along pipe 15. The coal charge containing particles larger than 3 cranes is sent to the pulverization furnace 1. It is sent along pipe 16 for further grinding in 17. The particle size is 31 or more due to crushing. is reduced below. After crushing, this coal charge fraction is sent along pipe 18 to produce coal. It joins the main stream of the coal charge sent along the pipe 15 to the coke oven 1 for chemical conversion.

released during the proposed process during coke cooling and charge preheating stages. The waste steam is the water vapor generated when the coal charge is heated. these waters The steam is passed along line 19 to a dust separator 20 where water is supplied along line 21. Sent. When the steam is discharged from the heat exchanger 8, it carries with it a load of coal dust. , this dust is easily isolated in the dust separator 20 and is delivered to the line 22 in pulp form. is returned to the heat exchanger 8 together with the initial coal charge.

The water vapor is discharged into the atmosphere through the pipe 23 after dust removal. Toxic components in water vapor The content of This is considerably lower than the conventional coke production method.

as a result of the removal of moisture from the coal charge, and partly in the coal charge during heat exchange. With the introduction of coke powder, its bulk density is increased, the carbonization conditions are improved, and the carbonization The period is shortened, which increases the speed of the carbonization process.

The increase in the bulk density of the coal charge and the speed of the carbonization process compared to conventional methods The throughput of the coke oven 1 is improved by about 40%, and the quality of coke is improved.

When the coal charge is mixed with coke, an amount of coke fines of 1.2-1.5% enters the coal charge, which deteriorates the coking properties of the coal charge as described above. On the contrary, it increases its bulk density, and when it is returned to carbonization together with the feedstock. Coal pulverization increases the yield of blast furnace coke.

According to the invention, the mass used as heat transfer material in the method proposed here The known method of preheating the coal charge using heat transfer gas as the coke is sent to the blast furnace In contrast to the method, it does not require discharge of the heat transfer material used.

The moisture content of the coal charge and its initial temperature are varied due to variations in ambient temperature. . This causes a change in the thermal and physical properties of the material, which causes the cooled coke and and variations can occur in the final temperature of the heated coal charge.

5 to 50 to stabilize the heating temperature of the coal charge and the cooling temperature of the coke. - A quantity of water per ton of coke is passed through line 24 for heat exchange by a spray nozzle. It is supplied into the container 8. Water is supplied to the 173 end of that length of the heat exchanger. Coke quality resulting in prevention of overheating of the coal charge and stabilized charge properties added to the improvements.

According to the best mode of carrying out the invention, an elevated temperature having a temperature of 600-1050'C Warm coke consists of coke fine particles sized to 251 or less and 25. i, more than minutes Zero-rotation drum supplied to screening device 5 for sorting into granulated lump coke is useful as a heat exchanger 8. This includes both the initial coal charge and the coke. Ensure uniform mixing at the confluence. In carrying out the method, the relative rotational speed of the drum , the amount of charge on the treated surface, and the degree of drum fullness is Fr (Froude number), It should be noted that the values of P and α are kept within a range that can satisfy the following equation: is strong: α=0.15~0.4 Tarishi, Fr is Froude number; P is the volumetric charge on the drum processing area; n is the drum rotation speed, rps%; Yes; D is the drum diameter, ml; L is the drum length, ml; G is the coal charge charge, m/S; ρ is the bulk density of the coal charge, kg/an ’, where g is the gravitational acceleration, m’s”, and; d is the average coke mass size, m,; α is the drum fullness coefficient.

When these conditions are met, the heat exchange efficiency is improved and the coal charge and coke The contact time of the coal particles is reduced, thereby allowing for more uniform heating and coking of the coal particles. Cooling of the mass is ensured. Furthermore, coke lumps are less likely to be ground up, and as a result, The amount of coke fines found in the fruit coal charge is low.

When the values of Fr, P and α fall outside the limits given in this invention, the coal charge and The contact time with the coke and the amount of coke fines entering the coal charge increases and Deterioration of the coking properties of the coal charge, low coke strength properties and emissions into the atmosphere. This results in a high share of gaseous toxic components contained in the vapors produced.

When the invention is carried out in accordance with the best mode proposed above, the coke strength is substantially reduced. A significant increase is given, while the amount of hazardous waste discharged into the atmosphere is increased by carrying out the carbonization process. It is reduced by 15-20% compared to other methods.

As can be clearly seen from the complete description of the invention and its preferred embodiments, Preheating of the coal charge occurs simultaneously with cooling of the coke. The method submitted here is heat Known methods include separate preheating of the coal charge with transfer gas and dry cooling of the coke method and requires less capital investment to implement.

The use of coke delivered as a heat transfer material from a coke oven means that coal is a gaseous heat transfer material. coal heating with heat transfer gas, such as in a heating device preheated by a It avoids the consumption of energy required to heat the contents, and also avoids the consumption of energy required to heat the Eliminates the need for mediating gas used to cool coke.

Furthermore, the present invention eliminates the need to vent waste heat transfer materials to the atmosphere, thus reducing the environmental impact. Prevent contamination.

The added bulk density of the preheated coal charge and the high coking rate The productivity of the coke production method can be improved by 40% compared to the conventional method, and Increase the share of low-caking coal to 70% without substantially compromising coal quality. make it possible to

The quality characteristics of the coke obtained depend on the preheating of the coal charge with a gaseous heat transfer substance and It is similar to that of known methods involving cooling of coke by dry cooling methods.

Therefore, the advantages of the proposed coke production method compared to conventional methods are significant. Substantial reduction in the amount of hazardous waste gas emissions into the air, capital investment and utilities This includes consumption savings as well as considerable process simplification and high productivity. Its simple Due to its simplicity, this method can be easily implemented under industrial field conditions. commerce In general, the method proposed here is advantageous compared to conventional methods.

Hereinafter, the present invention will now be disclosed in a detailed description of illustrative embodiments thereof with reference to the accompanying drawings. Ru.

Example 1 15.A quantity of 400 kg of coke with a temperature of 800°C is charged into storage tank 3. Ru.

Coke constitutes 7% of the screening device, 5 in the amount of 1, 1°00 pupil. Coke fine granules sized to 25 tsuru or less and 14.300 yen or more in quantity of 25n or more Sifted into sized lump coke.

20.A quantity of 100 kg of crushed coal charge with an initial moisture content of 9% is placed in storage tank 9. charged. Lump coke and coal charge are charged to heat exchanger 8, where this are mixed in both confluences and the coke to coal charge material ratio is 1:t, 4 . The heat exchange time is 408 seconds. The steam coming out of the heat exchanger 8 is supplied with water. It is wet dedusted in a layer separator 20 and discharged to the atmosphere after purification. water carries dust , in the form of a valve, from the bed separator 20 through a line 22 for mixing with the coal charge. carried out. The water consumption required for dedusting during a single process cycle is 162 kg. It was.

? , After the interaction, the mixture of coal and coke is passed through the screening device 11. Subdivided into coke and coal charges. Coal charge taken at the outlet of heat exchanger 8 The temperature of the material was found to be 160°C. The lump of coal charge leaving the heat exchanger is 18 , 600 kg, the preheated coal charge was found to be It was determined to contain an amount of coke fines of about 1.6% produced during the process.

The quality characteristics of the preheated coal charge were found to be: Volatile matter yield V”’ 29.3% Plastic layer thickness Y 13.8mm Swelling index I 25.3% Bulk density ρ 860 dazzle/m3 The coke leaves the heat exchanger at a temperature of 2oooC.

Cooling of coke by the proposed method involves virtually no coke loss.

Heat loss will be 5%.

The total amount of gaseous toxins contained in the water vapor constitutes 167 g/ton coke.

The preheated coal charge with a temperature of 160°C advances to a coke oven for carbonization. I can't stand it.

The resulting coke yield was 14.510-, which is 78% coke to coal It was the charge ratio.

The coke quality characteristics were as follows: strength M25 89.0% Attrition resistance MIO7.0% Known methods involving preheating of coal charge with gaseous heat transfer material and dry cooling of coke Compared to this, the proposed method increases the knee coke to coal charge yield by about 1.2%; - 50-60% reduction in the amount of toxins excreted; - 4 in the capital investment required to implement the method; It has the advantage of 3% reduction.

Example 2 The method is carried out as described in Example 1.

8.700 kg of coke with a temperature of 1000° C. are charged to storage tank 3.

The coke is in the screening device 5, with an amount of 600 glazes making up 7% 25. of granulated coke granules and an amount of 8,100 kg. Grain size of m or more sieved into lump coke.

20. A crushed coal charge in the amount of 200 kg with an initial moisture content of 9% is stored. It is charged into tank 9.

Lump coke and coal charges are sent to heat exchanger 8 where they are combined into both The coke to coal charge material ratio is 1:2.5.

Heat exchange time is 365 seconds.

The water vapor is dedusted in the same manner as described in Example 1 and then discharged into the atmosphere. For dust removal The amount of water required was 163 kg.

The coal charge is preheated to 150°C. The amount of coal charge required after heat exchange is 1 It was 8.600 kg.

The quality characteristics of the preheated coal charge were found to be: Volatile matter yield V”’ 30.0% Plastic layer thickness Y 14.0 Swelling index 7 27.1% Bulk density ρ 860 dazzle/fog 3 The coke was cooled to 170°C.

Heat loss will be 5%.

The total amount of harmful toxins in the waste steam constitutes 160 g/ton coke.

Virtually no coke losses occurred.

The yield of coke produced was 14,510 kg, which was 78% coke yield. coal charge yield.

The coke quality characteristics were as follows: strength M25 89.2% Attrition resistance MIO6.9% The preheated coke charge with a temperature of 150 °C is sent to coke oven 1 for carbonization. You can proceed to

Example 3 The method is described in Example 1 with respect to the amount of coal charge sent to preheating and the amount of coke. This is done in the same manner as above, and both are mixed at a preset ratio.

However, unlike the previous case, the steps of preheating the coal charge and cooling the coke are This is done by spraying water into the heat exchanger in an amount of 19 tons per ton of charge.

As a result, the coal charge was preheated to 140°C and the coke was cooled to 180°C. .

The quality characteristics of the preheated charge were found to be: volatile content retention; V”’29.6% Plastic layer thickness Y 14.5n Swelling index I 30.0% Bulk density ρ 860 kg/m” The coke quality characteristics after carbonization of the preheated charge were as follows: Strength M25 -89.6% Attrition resistance MIO = 6.9% A preheated coal charge with a temperature of 140°C advances to coke oven 1 for carbonization. I was caught.

Examples 4-7 The method is carried out as described in Examples 1-3.

The coal charge was placed in a dome with a heat exchange zone length and diameter of 1.6 m and 6 m, respectively. Mixed in a ram heat exchanger.

The coal charge is preheated with coke having a temperature of 970°C.

The coal charge to coke material ratio charged into the heat exchanger is 2.5:l.

The characteristics of the processes described in Examples 4-7 as well as the results obtained are shown in the following table. .

Industrial applicability The invention can be used in coke production processes used in the steel industry.

4 0.055 2.20 0.016 1.5 0.15 3905 0.1 38 2.90 0.10 5.0 0.25 3186 0.138 2.9 0 0.10 5.0 0.40 396 tables (continued) 4 1.6 29.8 15.6 30.6 89.9 6.8 1545 1 ．． 3 30.0 16.0 31.2 91.1 6.1 1506 1.2 29.8 16.0 30.8 90.3 6.4 1567 1.6 29. 9 15, 7 27.4 90.1 6.7 153 Procedural amendment (formality) %formula% 2. Name of Hakhu Coke production method 3. Person who makes corrections Relationship to the case: Applicant 6. Subject of amendment: Translation of description and claims 7. Contents of amendment: As attached. international search report

Claims (5)

[Claims] 1. Preheating of the crushed coal bags, carbonization of the heated coal bags and the obtained A coke production process that involves cooling coke and preheating bags of crushed coal. It is combined with coke having a temperature of 600-1050℃ (coal bag vs coke The substance ratio is within 1.3:1 to 2.6:1) by mixing in the confluence of both As a result, the coke temperature drops to 150-250℃, and the coal bag temperature decreases. After the temperature rises to within 120~240℃ and the heat exchange is completed, the coal charge and coke are separated. The mixture was subdivided into coke and coal bags and preheated to 120-240°C. A method of coke production characterized in that the coal charge is sent to carbonization. 2. Characterized by the fact that coke lumps with a minimum size of 10 mm are used for heat exchange The coke manufacturing method according to claim 1. 3. The preheated crushed coal bag is sifted into two sized portions and these portions are One part contains coal particles sized to 3 mm or less, and the other part contains coal particles sized to 3 mm or more. The part that contains particles that have been sized, and is made up of particles that have been subsequently sized to 3 mm or more. It is crushed and sized to reduce the particle size to 3 mm or less. characterized in that the resulting mixture is sent to carbonization. The coke manufacturing method according to claim 1. 4. The coal bags are injected with water in an amount of 10 to 80 kg per ton of initial coal charge. The coke according to claim 1, wherein the coke is mixed with coke while adding arks manufacturing method. 5. The initial coke charge is placed in a heat exchanger substantially characterized as a rotating drum. Mixed with high temperature coke, the value of Fr is: Fr=0.015~0.2 (However, Fr is the product of the rotational speed squared and the heat exchanger diameter squared and the gravitational acceleration and the product of the average size of the coke lump diameter) is within the range and the value of P is: P=(1.5~10)・10-6 (P is the product of the rotational speed of the heat exchanger and the amount of coal bag charged, and the direct heat exchanger diameter, heat exchanger length, coal charge bulk density, and the product of gravitational acceleration) is within the range and the value of α is: α=0.15~0.4 (where α is the degree of fullness of the heat exchanger volume). The coke manufacturing method according to claim 1, characterized in that: