JP2003003172A - Method for improving coke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for improving coke, by which coke quality irregularity caused by the difference in the maximum end-point temperatures in a coke oven is improved or the deteriorated quality of the coke due to the lowering of carbonization temperature or the shortage of carbonization time is improved by efficiently reheating red-heated coke in a coke dry quenching installation, thereby recovering the quality of the coke to that near to the quality of conventional high temperature carbonized coke. SOLUTION: This method for improving the coke, comprising charging air into the pre-chamber portion of CDQ to burn the coke and a gas generated from the red-heated coke, thus heating the coke, is characterized by outputting a coke strength distribution in the lower end cross-sectional inner portions of the pre-chamber by the use of a three-dimensional integrated simulation model comprising a material flow simulation model and a coke-improving simulation model and then determining the optimal air-blowing volume fit to a coke- discharging temperature on the basis of the outputted results.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke reforming method for reforming the quality of coke by utilizing a CDQ (coke extinguishing equipment) for cooling red hot coke discharged from a coke oven.

[0002]

2. Description of the Related Art Coke for a blast furnace has high strength so as to ensure air permeability in the blast furnace, and high temperature (1000-1200) for suppressing pulverization due to reaction deterioration of the coke at high temperature. It is required to have low reactivity with carbon dioxide (CO ₂ ) at (° C). Moreover, it is necessary that the manufacturing cost is as low as possible.

In order to reduce the production cost, it is effective to use inexpensive low-grade raw material coal, and to reduce the amount of heat of dry distillation by lowering the temperature of dry distillation and shortening the time of dry distillation.
However, all of these methods have the drawbacks of lowering the strength of the coke and increasing the reactivity with CO _{2 at} high temperature to promote the coke pulverization.

For this reason, various technical improvements have been made to improve the coke quality by blending and pretreating the charged coal, improving or homogenizing the bulk density in the kiln, and further improving the combustion method. All of these methods are improvement methods before or during carbonization. However, variations in coke quality due to non-uniform carbonization temperatures due to differences in charging density and furnace wall temperature are still observed in each coke oven kiln.

On the other hand, coke dry fire extinguishing equipment is used in many coke manufacturing plants. This dry fire extinguishing facility is a low energy facility that cools the red hot coke discharged from the coke oven and at the same time recovers its sensible heat. The quality is apparently improved by the effect of soaking / gradual cooling in the cooling tower of the dry fire extinguishing equipment and the stabilizing effect of the fragile part of the coke falling off when powder is unloading. Therefore, it can be said that dry fire extinguishing of coke is a kind of quality improvement method after carbonization. Several methods have been proposed to positively improve the quality of coke which has been lowered by lowering the carbonization temperature and shortening the carbonization time by using this dry fire extinguishing equipment. That is, this is a method in which the red hot coke discharged from the coke oven is put into the cooling tower of the dry fire extinguisher and reheated in the prechamber part.

For example, a method of blowing hydrocarbons (for example, tar) into the pre-chamber part of the cooling tower of the coke dry fire extinguisher to improve the quality (see Japanese Patent Laid-Open No. 63-8480) is one of them. . In this method, since hydrocarbons such as tar decompose in the vapor phase on the red hot coke, the generated pyrolytic carbon adheres to the surface of the red hot coke, and further enters the inside of pores and cracks, and It will be filled with pyrolytic carbon. Therefore, the wear strength and the crush strength are improved. Further, the pyrolytic carbon that coats the surface of the coke is an easily graphitizable, optically high-order anisotropic carbon, such as CO ₂ or water (H ₂ O).
The reaction rate with CO ₂ is extremely small, and these CO ₂
It is possible to suppress coke dusting due to the reaction with H ₂ O and H ₂ O.

However, in this method, although the quality of the coke is certainly improved, the total amount of the added tar does not react and unreacted tar is mixed in the heat exchange circulation gas and introduced into the boiler section. It is cooled by and condenses and adheres to pipes and the like. Therefore, various operational troubles are induced.

A method has also been proposed in which air is blown into the pre-chamber part of the cooling tower of the coke dry fire extinguishing system to improve the quality of coke (see Japanese Patent Publication No. 7-33511). This is a method of burning gas generated from red hot coke by oxygen in the air and raising the temperature of the red hot coke by the reaction heat to improve wear strength and crush strength.

However, the air blowing method has a problem that the contact between the air and the gas generated from the red hot coke is not always sufficient. That is, in the coke dry fire extinguishing equipment, since the gas is finally guided to the flue, both the air and the gas generated from the red hot coke basically flow downward in the prechamber part. In such a flow, the blown air first comes into contact with the red hot coke on the upper surface, and the oxygen in the air reacts with the carbon in the coke, and only the coke in the region where the air is blown is localized. This is because it burns to the inside and local heating occurs. Further, there is a problem that CO ₂ gas or H ₂ O gas generated by combustion of blowing air reacts with coke and weakens it.

Furthermore, the hot air generated by the combustion of the circulating gas in the dry fire extinguisher is blown into the pre-chamber part of the cooling tower of the coke dry fire extinguisher to raise the temperature of the red hot coke and improve the coke quality such as wear strength and crush strength. A method for improving is known (see Japanese Patent Laid-Open No. 7-126642). In this method, hot air is blown and the red hot coke is heated by the heat, so that a wider range of red hot coke can be heated more uniformly, and since hot air has low reactivity, it is possible to prevent the product coke from disappearing due to combustion, which is preferable.

However, even in the hot air blowing method, the hot air comes into contact with the red hot coke on the upper layer surface and is reheated, and the coke layer is weakened by the reaction with CO ₂ gas or H ₂ O gas. Since the coke strength is reduced at the same time, variations and segregation occur in the coke reforming effect. Further, since the hot air generator becomes large-scale in terms of equipment, a large equipment cost is required, and a heat loss is large during blowing the hot air from the generator to the blowing port, which is economically disadvantageous.

[0012]

As described above, in the coke oven, the variation in the furnace wall temperature in the height direction and the furnace length direction, and the difference in the maximum temperature reached due to the segregation of the coal charging density. Occurs, and the coke quality varies,
For this reason, reduction has been achieved by introducing pretreatment facilities such as humidified coal and preheated coal, but the problem has not been resolved. Furthermore, in order to reduce the manufacturing cost of metallurgical coke such as blast furnace coke, the dry distillation heat amount is reduced (that is, the dry distillation temperature or the dry distillation time is shortened), and the quality of the reduced coke is reduced. Various methods have been tried for improvement by reheating treatment in dry fire extinguishing equipment, but all have problems.

The present invention has been made to solve the above-mentioned problems in the prior art. It improves the variation in coke quality due to the difference in the maximum temperature reached in the coke oven, or lowers the carbonization temperature to reduce the carbonization time. To improve the quality of coke that has deteriorated due to shortening by efficiently reheating red hot coke in a coke dry fire extinguisher, and to provide a method for reforming coke that restores the quality of conventional high-temperature carbonization coke to the same level. With the goal.

[0014]

Means for Solving the Problems The present inventor has made various studies on the above-mentioned problems in the method for improving the quality of medium- and low-temperature carbonization coke produced by lowering the carbonization temperature by reheating in a coke dry fire extinguishing facility. did. As a result, it became possible to quantitatively evaluate the reforming effect by investigating and analyzing the phenomena in the coke dry fire extinguishing equipment and constructing a three-dimensional comprehensive simulation model. This model is CDQ
It consists of a material flow simulation model and a coke reforming simulation model inside, and considers the deterioration of coke due to combustion reaction of gas and coke generated from red hot coke and solution loss reaction, and the strength improvement effect by heating. . The present inventor has found that the present model quantitatively evaluates the reforming effect when air or hot air is blown, and has completed the present invention.

The gist of the present invention resides in the following coke reforming method.

According to the first aspect of the present invention, air is introduced into the pre-chamber part of the CDQ, the gas generated from the red hot coke and the coke are burned, and the coke is heated. Using a three-dimensional comprehensive simulation model consisting of the reforming simulation model, output the coke strength distribution at each part in the lower end cross section of the pre-chamber, and based on this output result, optimal air injection matching the coke firing temperature Characterized by determining the amount.

According to a second aspect of the present invention, in the coke reforming method according to the first aspect, a plurality of air blowing nozzles are used in accordance with the coke charging distribution (repose angle, particle size distribution) in the prechamber section. It is characterized in that the amount of air blown in is changed.

According to a third aspect of the present invention, in the coke reforming method according to the second aspect, a plurality of air blowing nozzles are used in accordance with the coke charging distribution (angle of repose, particle size distribution) in the prechamber section. It is characterized by changing the blowing angle of.

According to the invention of claim 4, a combustible gas and an oxygen-containing gas are introduced into the pre-chamber part of the CDQ as a heating gas for coke, hot air is generated by burning the combustible gas, and the combustion heat is used. In the coke reforming method of heating coke by using a three-dimensional integrated simulation model composed of a material flow simulation model and a coke reforming simulation model, the coke strength distribution in each part in the lower end cross section of the prechamber is output. It is characterized in that the optimum hot air temperature, the composition of the heating gas, and the hot air blowing amount are determined in accordance with the coke firing temperature based on the output result.

According to a fifth aspect of the present invention, in the coke reforming method according to the fourth aspect, a plurality of hot air blowing nozzles are used in accordance with the coke charging distribution (angle of repose, particle size distribution) in the prechamber section. It is characterized by changing the amount of hot air blown into.

According to a sixth aspect of the present invention, in the coke reforming method according to the fifth aspect, a plurality of hot air blowing nozzles are used in accordance with the coke charging distribution (repose angle, particle size distribution) in the prechamber section. It is characterized by changing the blowing angle of.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. In the above invention, after the red hot coke discharged from the coke oven is put into the pre-chamber part of the cooling tower of the CDQ (coke dry fire extinguishing equipment), the coke reforming simulation model is used to optimize the coke firing temperature. In this method, a large amount of air or hot air is blown into the pre-chamber part to reheat the red hot coke at a temperature higher than the carbonization temperature.

The red hot coke to be charged into the pre-chamber is a coke which has been subjected to dry distillation at 700 to 1000 ° C. in a chamber furnace type coke. In the pre-chamber part, the variation in the carbonization temperature between coke ovens is reduced to reduce the variation in coke quality and improve the quality. Also,
The amount of dry distillation heat is reduced, and as a result, the quality of the coke which is deteriorated is improved by reheating in the pre-chamber section.

The gas used for reheating the red hot coke is air or hot air, and the red hot coke is introduced into the pre-chamber part and then introduced into the same.

As a method of reheating the red hot coke charged into the prechamber part, air is blown into the prechamber part and the reaction heat between oxygen in the air and the red hot coke (or the gas generated from the red hot coke) is used. There is a method of blowing hot air having a low reactivity containing no oxygen and utilizing the sensible heat. However, as described above, the air blowing method has a problem that the coke locally burns and local heating occurs. In the hot air blowing method, CO ₂ gas or H ₂ O gas contained in the hot air reacts with coke to deteriorate the coke, and since these reactions are endothermic reactions, the effect of reheating the coke is reduced. There is also a problem. In addition, both methods directly charge the pre-chamber part from the coke bucket, so that the angle of repose of the convex part is generated in the coke packed bed, and air or hot air drifts radially and is not uniformly reformed. There is.

Therefore, in the present invention, the phenomenon in the coke dry fire extinguishing equipment was investigated and analyzed, and a three-dimensional comprehensive simulation model was constructed to quantitatively evaluate the coke reforming effect. This model is composed of a coke descent in CDQ, a material flow simulation model such as gas flow, and a coke reforming simulation model.

FIG. 1 shows the flow of simulation by this model. The material flow simulation model is
This is a model in which the equipment specifications and operation specifications of the CDQ are given as inputs, a three-dimensional numerical simulation of coke flow and gas flow in the furnace is performed, and the flow rate and temperature distribution of coke and gas in the furnace are output as a result.

The coke reforming simulation model inputs the flow rates and temperature distributions of the coke and gas obtained by the substance flow simulation model, and calculates the chemical reaction amount between the coke and gas in the furnace or between the gases. ,
Furthermore, it is a model in which the coke strength is estimated based on the reaction amount, and as a result, the coke strength distribution in each part in the lower end cross section of the prechamber is output.

The detailed contents of each part in the figure are shown below.

1) Input data. Enter the following items.

(Input data) CDQ equipment specifications ・ CDQ shape and dimensions ・ Positioning position of reforming gas (air or hot air) CDQ operational specifications ・ Coke throughput ・ Coke firing temperature ・ Flow rate, temperature, composition of circulating gas for cooling ・ Blowing amount, temperature, composition of reforming gas

2) Material flow simulation model. In the material flow simulation model, coke descent,
Solve the gas flow and coke-gas heat transfer equations and output the intermediate results shown below. This material flow simulation model consists of the following sub-models.

(Material flow simulation model) Coke descent model → Estimate in-reactor distribution of porosity, average particle size and descent rate Gas flow model → Flow rate distribution in each part in in-furnace (uneven flow)
Heat transfer model between coke and gas → Estimate heat transfer between coke and surrounding gas

3) Intermediate results. It is the result of the material flow simulation model, and at the same time, it becomes the input of the reforming simulation model. The items are as follows.

(Interim result) ・ Coke descent status, temperature distribution ・ Gas flow status, temperature / composition distribution

4) Coke reforming simulation model. It consists of the following submodels.

(Coke reforming simulation model) Evolved gas model from coke → Estimate evolved gas amount and gas composition Coke and reformed gas, and reaction rate model of evolved gas and coke → Combustion reaction amount, gasification reaction amount Coke reforming model based on estimated chemical reaction → Estimate coke strength change in furnace from coke temperature and reaction amount

In the coke reforming model, coke deterioration due to combustion reaction of gas and coke generated from red hot coke and solution loss reaction, and strength improving effect due to reheating are considered. As the chemical reaction model, the following seven reactions are prepared for the gas-gas reaction and the coke-gas reaction. 1) H ₂ + 1 / 2O ₂ = H ₂ O (hydrogen combustion reaction) 2) CO + 1 / 2O ₂ = CO ₂ (carbon monoxide combustion reaction) 3) CH ₄ + 1 / 2O ₂ = 2H ₂ + CO (methane combustion reaction) 4) H ₂ O + CO = H ₂ + CO ₂ (gas shift reaction) 5) C + 1 / 2O ₂ = CO (coke combustion reaction) 6) C + CO ₂ = 2CO (solution reaction) 7) C + H ₂ O = H ₂ + CO (water gasification reaction)

5) Output result. As a final result, the coke strength distribution in the furnace cross section after passing through the CDQ prechamber is output.

It was found that the present model quantitatively evaluates the reforming effect at the time of blowing hot air with different air or gas composition, and it is necessary to blow the optimum air or hot air according to the maximum temperature of the coke. Became possible. In other words, using a coke reforming simulation model, if a parameter study was performed with the coke oven temperature fixed and the amount of air blown changed, the relationship between the amount of air blown and the coke strength after reforming was calculated. can get. If this is used, it is possible to determine the necessary and sufficient blowing amount to achieve the target strength.

Using a reforming simulation model, a parameter study was conducted in which the blowing amount, blowing temperature, and gas composition of the hot air were changed with the coke oven temperature set to a fixed value, and the above parameters of the hot air and the reforming were performed. The later coke strength relationship is obtained as a calculation result.
Using this result, it is possible to determine each parameter value necessary to achieve the target strength.

Further, in the present invention, the air blowing amount or the hot air blowing amount from the plurality of air blowing nozzles is changed according to the coke charging distribution (repose angle, particle size distribution) in the prechamber section. Specifically, if a reforming simulation is performed in consideration of the coke charging distribution, it is possible to estimate the uneven distribution of the reforming effect due to the uneven flow of the heating gas. Furthermore, by performing a simulation in which the amount of blown air or the amount of hot air is changed, it is possible to estimate the amount of air or hot air that is necessary and sufficient to obtain the target reforming effect within the entire cross section of the furnace. The blowing amount is changed based on the result.

Further, according to the present invention, the blowing angles from the plurality of air blowing nozzles or the blowing angles from the hot air blowing nozzles are adjusted according to the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. To change. Specifically, if a reforming simulation is performed in consideration of the coke charging distribution, it is possible to estimate the uneven distribution of the reforming effect due to the uneven flow of the heating gas. Furthermore, by performing simulations with different blowing angles, it is possible to estimate the blowing angle that suppresses the above-mentioned drift and makes the reforming effect in the cross section most uniform. Therefore, the blowing angle is changed based on the result.

[0044]

EXAMPLE The present invention was carried out by a coke dry fire extinguishing system as shown in FIG. 2 equipped with an air or hot air blowing device. The red-hot coke discharged from the coke oven was put into the pre-chamber part of the coke dry fire extinguisher system from the inlet, and after the lid of the inlet was installed, a fixed amount of air or hot air was blown from the top to reheat. The red hot coke was charged every 10 minutes according to the kiln removal from the coke oven, and the air or hot air blowing was stopped when the charging port lid was opened. The red hot coke reheated with air or hot air in the pre-chamber part is cooled to about 130 ° C. by the circulating gas in the cooling tower, and CDQ
Is discharged to the outside of the system. In Examples 1 to 3 below,
As shown in FIG. 3, three air or hot air blowing nozzles are radially provided at equal intervals in the circumferential direction.

[Example 1] Coke was produced under the condition that the operating rate of the coke oven was constant, and was continuously charged into the pre-chamber section of the coke dry fire extinguishing equipment, air was introduced, and reheating was performed.
The effect on coke quality was investigated.

Table 1 shows the relationship between various conditions and coke quality.

[0047]

[Table 1]

Case 1 shows the coke quality when no air is blown in. Case 2 is the coke quality when a certain amount of air is blown into the red hot coke of all kilns. Case 3 is the coke quality when the coke firing temperature is measured and the amount of blown air is changed using the three-dimensional integrated simulation model.

By thus changing the air blowing temperature in accordance with the coke firing temperature using the three-dimensional integrated simulation model, the effect of modifying the quality of coke can be increased and the variation in quality can be reduced. confirmed.

Example 2 With the dry distillation temperature of the coke oven fixed, the average temperature of the coke was removed from the kiln at 850 ° C. and continuously charged into the pre-chamber section of the coke dry fire extinguisher facility.
Air was introduced, and reheating was performed up to about 950 ° C. to examine the influence on coke quality.

Table 2 shows the relationship between various conditions and coke quality.

[0052]

[Table 2]

Case 4 shows the quality of coke when no air is blown into it. Case 5 is the coke quality when the average temperature of the coke firing is measured and the blown air amount is changed using the three-dimensional integrated simulation model.

As described above, by changing the amount of air blown in accordance with the coke firing temperature using the three-dimensional integrated simulation model, it is possible to reform the middle and low temperature coke, and the reforming effect becomes large, It was also confirmed that the quality variation was small.

[Example 3] With the dry distillation temperature of the coke oven constant, the average temperature of the coke was kiln-fired at 850 ° C, and the coke was continuously charged into the prechamber section of the dry-fire extinguishing equipment.
Hot air was introduced and reheating to about 950 ° C. was performed to examine the effect on coke quality. The hot air temperature is 1250 ° C., the gas composition of the heating gas is CO ₂ : 4.5%, H ₂ O: 12.1%,
_{N 2: 73.6%, O 2} : 9.8%. In the examples, combustible gas (C gas, composition: CO: 6.7%, C
_{O 2: 2.8%, H 2} : 52.2%, N 2: 3.1%, C
_{H 4: 27.1%, C 2} H 4: 3.9%, H 2 O: 4.2
%) And oxygen-containing gas (dry air with a void ratio of 2) CDQ
The coke is heated by introducing it into the interior of the coke and combusting it, and resulting combustion exhaust gas (corresponding to hot air or heated gas in the text).

Table 3 shows the relationship between various conditions and coke quality.

[0057]

[Table 3]

Case 6 shows the coke quality when hot air is not blown. Case 7 is the coke quality when the average temperature of the coke oven is measured and the blown hot air volume is changed using the three-dimensional integrated simulation model.

As described above, by changing the amount of air blown in accordance with the coke firing temperature using the three-dimensional integrated simulation model, it is possible to reform the medium- and low-temperature coke, and the reforming effect becomes large, It was also confirmed that the quality variation was small.

[Example 4] Coke was produced under the condition that the operating rate of the coke oven was constant, continuously introduced into the pre-chamber section of the coke dry fire extinguisher, and air was introduced to reheat the coke.
The effect on coke quality was investigated. The angle of repose of the coke packed bed in the CDQ prechamber part was 30 °, the average temperature of the coke charged was 940 ° C, and the amount of air blown was 90 Nm ³ / t. In Example 4 or Example 5, two or four air or hot air blowing nozzles are radially provided at equal intervals in the circumferential direction, as shown in FIG.

Table 4 shows the relationship between various conditions and coke quality.

[0062]

[Table 4]

Case 1 shows the quality of coke when air is blown uniformly from two nozzles. Case 2
Is the quality of coke when air is blown uniformly from three nozzles. Case 3 is the quality of coke when air is blown uniformly from the four nozzles. Case 4 measures the temperature at which the coke is fired, and uses the three-dimensional integrated simulation model to determine the amount of air blown from the four nozzles according to the coke charging distribution (repose angle, particle size distribution) in the prechamber part. It is the coke quality when changed.

As described above, by changing the air blowing amount from the plurality of air blowing nozzles in accordance with the coke charging distribution (repose angle, particle size distribution) in the pre-chamber using the three-dimensional integrated simulation model. It was confirmed that the effect of modifying coke quality was large and the quality variation was small.

[Example 5] With the dry distillation temperature of the coke oven fixed, the average temperature of the coke was kiln-fired at 850 ° C, and the coke was continuously charged into the prechamber section of the dry fire extinguishing equipment.
Hot air was introduced and reheating to 950 ° C. was performed to examine the effect on coke quality. The repose angle of the coke packed bed in the CDQ prechamber was 30 °, and the average temperature of the coke charged was 9
At 50 ° C., the amount of air blown is 100 Nm ³ / t. The hot air temperature was 1260 ° C and the gas composition was CO ₂ : 4.5.
%, H ₂ O: 12.1%, N ₂ : 73.6%, O ₂ : 9.
8%.

Table 5 shows the relationship between various conditions and coke quality.

[0067]

[Table 5]

Case 1 shows coke quality when hot air is blown uniformly from the three nozzles. Case 2
Is the coke quality when hot air is blown uniformly from the four nozzles. Case 3 measures the coke firing temperature and uses the three-dimensional integrated simulation model to determine the amount of hot air blown from the four nozzles according to the coke charging distribution (repose angle, particle size distribution) in the prechamber part. It is the coke quality when changed.

As described above, by changing the hot air blowing amount from the plurality of hot air blowing nozzles according to the coke charging distribution (repose angle, particle size distribution) in the prechamber using the three-dimensional comprehensive simulation model. It was confirmed that the effect of modifying coke quality was large and the quality variation was small.

[Example 6] Coke was produced under the condition that the operating rate of the coke oven was constant, continuously charged into the pre-chamber part of the coke dry fire extinguishing equipment, air was introduced, and reheating was performed to improve coke quality. I investigated the effect. The angle of repose of the coke packed bed in the CDQ prechamber part was 30 °, the average temperature of the coke charged was 940 ° C, and the amount of air blown was 90 Nm ³ / t. In Example 6 or Example 7, as shown in FIG. 5, four air or hot air blowing nozzles are radially provided at equal intervals in the circumferential direction. Further, the blowing angle of the air or hot air blowing nozzle is 0 ° which is oriented in the horizontal direction.
It is possible to change the angle from 60 ° to a downward angle with respect to the horizontal direction.

Table 6 shows the relationship between various conditions and coke quality.

[0072]

[Table 6]

Case 1 is the coke quality when a fixed amount of air is blown uniformly from a plurality of nozzles. In Case 2, the coke oven temperature was measured, the blown air amount was determined using a three-dimensional integrated simulation model, and multiple air blowers were blown according to the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. It is the coke quality when the amount of air blown is changed at a constant blowing angle from the blowing nozzle. Case 3 measures the temperature at which coke is discharged from the kiln, determines the amount of air blown in using a three-dimensional integrated simulation model, and adjusts the coke charging distribution (angle of repose, particle size distribution) in the pre-chamber to obtain multiple air flows. It is the quality of coke when the air blowing angle and flow rate from the blowing nozzle are changed.

As described above, the effect of modifying the coke quality is greatly improved by changing the blowing angles and flow rates from the plurality of air blowing nozzles according to the coke firing temperature using the three-dimensional integrated simulation model. It was also confirmed that the quality variation was small.

[Embodiment 7] With the dry distillation temperature of the coke oven kept constant, the average temperature of the coke was kiln-fired at 850 ° C., and the coke was continuously charged into the prechamber section of the dry fire extinguishing equipment.
Hot air was introduced and reheated to about 950 ° C. to examine the effect on coke quality. The repose angle of the coke packed bed in the CDQ prechamber was 30 °, and the average temperature of the coke charged was 9
The temperature was 50 ° C., and the hot air blowing rate was 100 Nm ³ / t. The hot air temperature was 1260 ° C and the gas composition was CO ₂ : 4.5.
%, H ₂ O: 12.1%, N ₂ : 73.6%, O ₂ : 9.
8%.

Table 7 shows the relationship between various conditions and coke quality.

[0077]

[Table 7]

Case 1 is the coke quality when a constant amount of hot air is blown from a plurality of nozzles. Case 2 measures the temperature of the coke oven, determines the amount of hot air to be blown in using a three-dimensional integrated simulation model, and blows multiple hot air in accordance with the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. It is the quality of coke when the flow rate is changed while the injection angle from the injection nozzle is constant. Case 3 measures the temperature at which coke is fired, determines the amount of hot air blown into it using a three-dimensional integrated simulation model, and selects multiple heat sources according to the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. It is the quality of coke when the blowing angle and flow rate from the blowing nozzle are changed.

As described above, the three-dimensional integrated simulation model was used to change the hot air blowing amount in accordance with the coke firing temperature and to adjust the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. It was confirmed that the effect of modifying the coke quality was enhanced and the quality variation was reduced by changing the blowing angle and flow rate from the hot air blowing nozzles.

[0080]

As described above, according to the present invention,
Using the three-dimensional integrated simulation model, the optimum air blowing amount or the hot air temperature, the composition of the heating gas and the hot air blowing amount that match the coke firing temperature are determined. It is possible to improve the variation in coke quality due to the difference. In addition, the quality of the coke, which has deteriorated due to the reduction of the carbonization temperature and the shortening of the carbonization time, is improved by efficiently reheating the red hot coke in the coke dry fire extinguishing equipment, and the quality of the conventional high temperature carbonization coke is maintained. Can be recovered.

[Brief description of drawings]

FIG. 1 is a diagram showing a flow of a three-dimensional comprehensive simulation model.

FIG. 2 is a sectional view showing an outline of a coke dry fire extinguishing facility (CDQ) to which the coke reforming method of the present invention is applied.

FIG. 3 is a horizontal cross-sectional view showing the nozzle arrangement of the air or hot air blowing nozzle of the CDQ.

FIG. 4 is a cross-sectional view in the horizontal plane showing the nozzle arrangement of the air or hot air blowing nozzle of the CDQ ((A) in the figure shows two nozzle arrangements, (B) shows the three nozzle arrangement, and FIG. The middle (C) shows the arrangement of three nozzles).

FIG. 5 is a view showing a nozzle arrangement of air or hot air blowing nozzles of the CDQ ((A) in the drawing is a cross-sectional view in a horizontal plane;
(B) shows a vertical in-plane sectional view.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoshi Fukada             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Yamaguchi Imasa             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Yasuo Nagashima             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Kazutoshi Matsumoto             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. F-term (reference) 4H012 DA02 DA11

Claims (6)

[Claims] 1. A coke reforming method in which air is introduced into a pre-chamber part of a CDQ to burn the gas generated from the red hot coke and the coke to heat the coke, which is obtained from a material flow simulation model and a coke reforming simulation model. Output the coke intensity distribution in each part of the lower end cross section of the pre-chamber using the configured three-dimensional integrated simulation model, and determine the optimum air injection amount that matches the coke firing temperature based on this output result. A method for reforming coke, characterized by: 2. The air blowing amount from a plurality of air blowing nozzles is changed according to the coke charging distribution (angle of repose, particle size distribution) in the pre-chamber section. Coke reforming method. 3. The air blowing angle from a plurality of air blowing nozzles is changed according to the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. Coke reforming method. 4. A combustible gas and an oxygen-containing gas are introduced into a CDQ prechamber as a heating gas for coke, hot air is generated by burning the combustible gas, and the combustion heat is used to heat the coke. In the coke reforming method, the coke strength distribution in each part in the lower end cross section of the prechamber is output using a three-dimensional comprehensive simulation model consisting of a material flow simulation model and a coke reforming simulation model, and the output result is used as the basis. A method for reforming coke, which comprises determining an optimum hot air temperature, a composition of a heating gas, and an amount of hot air blown in accordance with a coke firing temperature. 5. The hot air blowing amount from a plurality of hot air blowing nozzles is changed according to the coke charging distribution (angle of repose, particle size distribution) in the pre-chamber section. Coke reforming method. 6. The hot air blowing angle from a plurality of hot air blowing nozzles is changed according to the coke charging distribution (repose angle, particle size distribution) in the pre-chamber section. Coke reforming method.