JPH09165580A - Continuous vertical coke production facility and its operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous vertical coke production facility enabling effective utilization of sensible heat of red hot coke and free from generation of dust and provide the operation process of the facility. SOLUTION: This continuous vertical coke production facility is provided with a continuous vertical coke oven 11, a dry-quenching apparatus 12 placed immediately below the coke oven in a state connecting the inner parts of the oven to the quenching apparatus and a waste heat boiler 13 to generate steam by recovering the sensible heat of the circulating gas of the dry-quenching apparatus. It is further provided with a drying and preheating machine 22 to dry and preheat the coal to be charged into the coke oven and a hot-forming machine 19 to form the dried and preheated coal in the form of a block. The sensible heat of red hot cake is effectively recovered and the scattering of dust generated during the transportation is prevented in contrast to conventional method. The facility is also effective for the improvement of productivity and coke quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for recovering sensible heat of coke discharged from a coke oven in a continuous vertical coke production facility and a method of utilizing the recovered sensible heat.

[0002]

2. Description of the Related Art A continuous vertical coke oven requires less space for installation, and therefore has the advantages of being housed in a building, less gas leakage and less dust during operation, and more efficient coke production. Known as a coke oven that can be manufactured.

However, at present, coke is generally manufactured in a chamber furnace type coke oven, and coke is not manufactured in a continuous vertical coke oven. This is because when trying to produce coke in a conventional continuous vertical type coke oven, a hanging phenomenon occurs in the furnace due to the expansion of coal or the agglomeration of thermal decomposition products, and the unloading cannot be performed smoothly. This is because dry distillation cannot be carried out efficiently, and the properties such as particle size and strength of the produced coke are inferior to those of the chamber coke oven.

In order to solve such a problem, the inventors of the present invention have proposed a continuous vertical coke oven disclosed in Japanese Patent Laid-Open No. 263078/1993. As shown in FIG. 3, this continuous vertical vertical coke oven uses coal for the coke oven 11
It is charged by the compression extruder 2 provided in the upper part of the. Then, in the carbonization process, the compression extruder 2 and the coal pressure transfer machine 5 provided at several places in the furnace belly are used for compaction and extrusion downward. On the other hand, the gas generated in the carbonization process is collected in the generated gas recovery chambers 6 provided at a plurality of positions in the height direction of the coke oven 11, and is extracted outside the furnace by the generated gas recovery pipe 7. The red hot coke, which has been completely carbonized in the lower part 11a of the carbonization chamber, is put into the cooling water below the discharge valve 9 in the fire extinguishing chamber 12 therebelow to be cooled, and then discharged from the discharge port 10 to the outside of the furnace.

In this continuous vertical type coke oven, the unloading of the coal is forcedly promoted, and the generated gas is generated in the carbonization chamber 11.
Since the high boiling point components do not aggregate to generate tar during the ascending in a, the coal unloading becomes smooth, and the hanging phenomenon does not occur in the furnace. In addition, since the bulk density of coal is increased, the properties of the coke produced, such as particle size and strength, are improved, and coke having properties similar to those of chamber furnace coke can be obtained.

[0006]

However, in the above-mentioned continuous vertical coke manufacturing equipment of Japanese Patent Laid-Open No. 5-263078, the red hot coke is put into water to cool it, so that the sensible heat of the red hot coke is effective. Can not be collected. As a matter of course, the fire may be extinguished with a dry fire extinguisher equipped with red hot coke separately as in the case of a room furnace type coke oven, but in this case, since the dry fire extinguishing equipment is installed away from the coke oven, it is a continuous type. Since it is necessary to transfer from a vertical coke oven, there is a problem that the working environment is deteriorated due to heat energy loss from the red hot coke and dust scattering during the transfer.

The present invention has been made in order to solve this problem, and the thermal energy possessed by the red hot coke can be effectively utilized, and no dust is generated due to the coke contained in the coke. It is an object of the present invention to provide a vertical coke manufacturing facility and a method of operating the same.

[0008]

The present invention solves the above object by the following equipment and method.

A first aspect of the present invention is to provide a dry fire extinguisher with an internal communication directly below a continuous vertical coke oven.
A continuous vertical coke manufacturing facility provided with a waste heat boiler that recovers sensible heat of the circulating gas of the dry fire extinguisher and generates steam, wherein the second invention is the first invention, and further, the continuous It is a continuous vertical coke production facility with the addition of a drying / preheating machine for drying and preheating coal to be loaded into the vertical vertical coke oven and a hot molding machine for molding the preheated coal into blocks. The invention of No. 3 is the continuous vertical coke oven of the first invention and the second invention, wherein the continuous vertical coke oven is equipped with a coal pressure transfer machine that moves coal while pressurizing it at a plurality of locations along the furnace length direction. It is a continuous vertical coke manufacturing equipment, 4th invention is a dry-type fire extinguisher as a gas used for the said drying and preheating in the operating method of the continuous vertical coke manufacturing equipment of 2nd invention and 3rd invention. Use some or all of the circulating gas in Which is the operation method of a continuous vertical coke production facility characterized.

According to the first aspect of the present invention, the coke, which has been subjected to the carbonization in the carbonization chamber, is charged into the dry fire extinguisher without losing its retained heat and cooled by the circulating gas. On the other hand, the sensible heat of the red-hot coke can be effectively recovered because the circulating gas that has become hot by absorbing the sensible heat from the red-hot coke dissipates heat in the waste heat boiler to generate steam. Further, since the carbonization chamber and the dry fire extinguisher are in communication with each other, the step of transferring the red hot coke unlike the conventional equipment is eliminated, and therefore the dust generated during the transfer is not scattered around.

According to the second aspect of the present invention, the dry preheating increases the production capacity by shortening the dry distillation time, improves the charging density, and improves the coking property by increasing the width of the softening and melting layer of coal during the dry distillation, which is efficient. It is possible to obtain the effects of reducing the total calorific value required for dry distillation by adopting a different drying preheater, and reducing the cost of treatment of less water by reducing the amount of less water produced. Further, the hot forming further improves the coking property and makes it possible to mix the weak coking coal.

According to the third aspect of the invention, the coal can be moved to the lower part of the carbonization chamber one after another while being pressurized,
Coals can be efficiently produced without the coal hanging in the carbonization chamber.

According to the fourth invention, part of the fuel used in the dry preheating step can be replaced by the sensible heat of the circulating gas of the dry fire extinguisher.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the continuous vertical coke production equipment of the present invention comprises a coal drying preheater, a hot molding machine and a continuous vertical coke production equipment. Each of these will be described below.

The "coal drying preheater" 21 is a hopper for temporarily storing the coal transferred from the blending tank, and 22 is a fluidized heating and drying device for drying and preheating the coal while allowing the hot air (about 600 ° C) to flow the coal. is there. The coal temporarily stored in the hopper 21 is supplied to the fluid heating and drying device 22. On the other hand, the hot gas produced by the hot air generator 26 is supplied to the fluidized-heat drying apparatus via the blower 27. The coal supplied to the fluidized-bed heating / drying device 22 is in a fluidized state, dried by hot gas, and preheated to 100 to 200 ° C. The preheated coal is supplied to the preheated coal bottle 18 by the screw conveyor 23.

The gas obtained by drying and preheating coal by the fluidized-bed heating / drying device 22 is subjected to primary dust removal by the cyclone dust collector 28, and finally enters the filter dust collector 29 to be finally dust-removed to become clean gas, which is supplied to the hot air generator 26 again through the exhaust fan 25. To be done.

"Hot Forming Machine" The coal supplied to the preheating coal bottle 18 is added with a binder by the screw feeder 17 and supplied to the hot forming machine 19. Hot forming machine 19
Then, it is molded into a plate-shaped block 16 of 1000 mm × 500 mm × 200 mm, which is continuously formed in the coke oven 11
Will be charged.

"Continuous Vertical Coke Manufacturing Equipment" The continuous vertical coke manufacturing equipment comprises a coke oven 11 and a dry fire extinguisher 12. The coke oven 11 has a vertically long carbonization chamber 3 arranged at the center thereof, and on both sides thereof, a first combustion chamber 4a, a first pressurizing mover 5a, a second combustion chamber 4b, and a second pressurizing mover 5b. A third combustion chamber 4c is provided. 6 is a generated gas recovery chamber for recovering the generated gas generated in the carbonization chamber 3, and the gas collected here is sent to a gas refining facility or the like by a generated gas recovery pipe 7. 2 is a compression extruder which pushes down the coal block charged from the upper furnace port of the coke oven 11.

In each combustion chamber 4a, 4b and 4c,
M gas whose calorie is adjusted by mixing coke oven gas and blast furnace gas is used as fuel. The combustion exhaust gas in each combustion chamber is discharged from a stack (not shown).

A dry fire extinguisher 12 is provided just below the coke oven 11.
Are provided so that the inside communicates. The dry fire extinguisher 12 comprises a pre-chamber 12a and a cooling chamber 12b, and a flue 12c for cooling the hot red coke in the upper part of the cooling chamber 12b to extract a gas having a high temperature (about 900 ° C).
Is provided. Reference numeral 13 is a waste heat boiler that generates steam by utilizing the sensible heat of the high temperature gas, and the steam manufactured here is sent to a power generation turbine. Reference numeral 14 is a cooling gas distribution device for uniformly distributing the gas cooled by giving sensible heat in the waste heat boiler 13 to the coke layer in the cooling chamber. The high temperature gas and the cooling gas are collectively referred to as a circulating gas.

Reference numeral 15 denotes a hopper for temporarily storing the coke cooled by the dry fire extinguisher 12, and the coke in this hopper is discharged by a feeder 30 to a belt conveyor 31 which conveys the coke to a coke bin on the blast furnace side. To be done.

The pre-chamber 12a of the dry fire extinguisher has a rectangular horizontal cross-section to match the outlet of the carbonization chamber 3 of the coke oven 11 so that the coke discharged from the coke oven 11 can be smoothly unloaded. ing. Further, in order to uniformly load the coke into the cooling chamber 12b,
A dispersion 12d is provided in the center of the prechamber 12a.

The dry type fire extinguisher 12 and the coke oven 11 are covered with an iron skin on the outer surfaces in order to make them airtight with respect to the outside air.

Next, one embodiment of the method for operating the above-mentioned apparatus will be described below. Coking coal mixed with several types of coal is fed from the mixing tank side to the hopper 21 so that the desired coke quality is obtained. The raw coal of the hopper 21 is dried and preheated in a fluidized bed state by the coal drying preheater 22 to become preheated coal of about 200 ° C. This preheated coal is supplied to the preheated coal bottle 18, and then the screw feeder 17
Then, a binder is added and the mixture is supplied to the hot molding machine 19. 1000 mm (length) x 500 m with hot molding machine 19
It is molded into a plate-shaped block 16 of m (vertical) × 200 mm (horizontal), and is intermittently charged into the coke oven 11.

The charged coal block is used in the compression extruder 2
At that time, it is pressed down while being consolidated at a pressure of 1.5 kg / cm ² . Thereafter, while being consolidated at a pressure of 1.5 kg / cm ² by the first pressure moving machine 5a and the second pressure moving machine 5b,
Can be moved downward. As the pressurizing transfer machine, one in which coal is sent downward while being compressed by a pair of rolls, one in which coal is sent downward while being compressed by a pair of endless chain belts (in this case, the endless chain belt is (Requires a pushing device for pushing), or a system in which coal is pushed diagonally downward with a compression member connected to the tips of a plurality of hydraulic cylinders provided on one furnace wall side of the carbonization chamber.

The coal block charged at the top of the coke oven is lowered from 700 ° C. to 9 ° C. by conduction heat from the first combustion chamber 4a, the second combustion chamber 4b and the third combustion chamber 4c as it descends.
While being gradually heated to 00 ° C. and carbonized, the lower part of the third combustion chamber 4c is completely carbonized to become red hot coke.

On the other hand, the gas generated in the dry distillation process is extracted into the generated gas recovery chamber 6 and sent to the gas refining equipment or the like via the generated gas recovery pipe 7. The amount of the generated gas taken out (about 190 Nm ³ / t-coal) is controlled so that the gas pressure in the carbonization chamber is 1.5 kg / cm ² or less. As a result, it is possible to prevent the hanging of the coal block in the process of carbonization in the furnace.

The red hot coke, which has been subjected to carbonization, descends into the pre-chamber 12a of the dry fire extinguisher 12 under the coke oven 11 and is uniformly distributed by the dispersion 12d over the entire cross section of the cooling chamber 12b. To descend.

During this time, the red hot coke gives sensible heat to the circulating gas rising through the cooling gas distribution device 14, while cooling itself to about 150 ° C. and reaching the hopper 15. The coke in the hopper 15 is delivered to the conveyor belt 31 via the feeder 30 and fed to the blast furnace side coke bin. On the other hand, circulating gas (1500 Nm ³ / t-co
al) is heated to about 900 ° C., flows into the flue 12c, and flows into the waste heat boiler 13 through the duct. The waste heat boiler 13 obtains sensible heat of the circulating gas to produce steam. The circulating gas at about 150 ° C. cooled by the waste heat boiler 13 again flows into the coke layer descending via the cooling gas distributor 14.

The hot air generator 26 in the drying preheating step
In addition, if a part or all of the circulating gas of the dry fire extinguisher 12 is fed, the fuel used in the hot air generator 26 can be saved. In this case, a part or all of the circulating gas after the waste heat boiler is introduced to the inlet pipe of the fluidized-heat drying apparatus, and the gas after drying preheating is returned to the circulating gas pipe after the waste heat boiler.

[0031]

EXAMPLE Using the apparatus of the present invention, three levels of operation experiments were carried out by changing the coal preheating temperature and the coal bulk density. Table 1
Shows the operating specifications at that time. For comparison, the same table shows the operating specifications of a conventional continuous vertical coke oven that does not have a dry preheating facility and a dry fire extinguisher that communicates directly below the coke oven.

[0032]

[Table 1]

FIG. 2 is a line graph showing productivity, JIS drum strength and JIS reactivity when coke is produced under the above-mentioned operational specifications. As shown in FIG. 2, it was found that when the coal preheating temperature and the charging coal density were increased, the productivity and the drum strength were improved, and the JIS reactivity was also decreased.

Here, JIS reactivity means JIS K 2151.
It is an index indicating the reaction rate of coke and CO ₂ gas at high temperature and is used as a standard for knowing the state of decrease in coke strength in the blast furnace.

[0035]

Since the present invention is constructed as described above, the following effects can be obtained.

According to the first aspect of the present invention, the sensible heat of the red hot coke can be effectively recovered, and the scattering of dust generated during the conventional transportation is eliminated.

According to the second invention, the productivity and the quality of coke can be improved. According to the third invention, the fuel used in the dry preheating step can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a graph showing changes in coke productivity and the like when operating conditions are changed in the device of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional device.

[Explanation of symbols]

 2 compression extruder 3 carbonization chambers 4a, 4b, 4c 1st, 2nd, 3rd combustion chambers 5a, 5b 1st, 2nd pressure transfer machine 6 evolved gas recovery chamber 7 evolved gas recovery pipe 11 coke oven 12 dry fire extinguisher 12a pre Chamber 12b Cooling chamber 12c Flue 12d Dispersion 13 Waste heat boiler 14 Cooling gas distributor 15 Hopper 21 Hopper 16 Plate block 18 Preheated carbon bin 19 Hot forming machine 22 Fluid heating dryer 26 Hot air generator 30 Feeder 31 Belt conveyor

Claims (4)

[Claims] 1. A dry fire extinguisher is provided directly below the continuous vertical coke oven, and a waste heat boiler for recovering sensible heat of the circulating gas of the dry fire extinguisher to generate steam is provided. This is a continuous vertical coke production facility. 2. The equipment according to claim 1, further comprising a drying / preheating machine for drying and preheating the coal charged in the continuous vertical coke oven and a heat for molding the dried and preheated coal into a block shape. A continuous vertical coke production facility, which is equipped with an inter-molding machine. 3. The continuous vertical coke oven is equipped with a coal pressure transfer machine that moves coal downward while pressing the coal at a plurality of locations along the furnace length direction. Continuous vertical type coke manufacturing equipment described. 4. The operating method using the continuous vertical coke manufacturing equipment according to claim 2 or 3, wherein a part or all of the circulating gas of the dry fire extinguisher is used as the gas used for the drying and preheating. A method for operating a continuous vertical coke production facility, which is characterized by