JPH07300589A - Continuous vertical coke oven and production of coke - Google Patents

Abstract

PURPOSE:To produce good-quality coke at high efficiency with a continuous vertical coke oven. CONSTITUTION:This production process is one for producing coke by using a continuous vertical coke production equipment composed of a continuous vertical coke oven 1, a drier/preheater 2 for drying and preheating coal 11 to be fed into the coke oven 1 and a hot former 5 for forming the dried and preheated coal into blocks, wherein the production is performed in such operating conditions that the drying and preheating temperature of coal 11 is 200-300 deg.C, the bulk density of the formed coal is 0.9-1.1t/m<3>, the temperature at the center of the coking chamber in the coking zone is 750-900 deg.C, the pressure applied to the side of the coal 11 is 1-2kgf/cm<2>, and the velocity at which the coal 11 falls within the coke oven is 0.5-1.5m/h.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing coke using a continuous vertical type coke equipment.

[0002]

2. Description of the Related Art A continuous vertical type coke oven has a small installation space, so that it can be stored in a building, has little gas leakage and dust during operation, and can efficiently produce coke. It is known as a coke oven having the advantages such as FIG. 9 is a diagram showing such a continuous vertical coke. In FIG. 9, 1 is a vertical furnace body, 3 is a coal hopper, 10 is a carbonization chamber, 11 is coal, 12 is a combustion chamber, 13 is an auxiliary hopper, 14 is a coke discharge port at the bottom of the furnace, and 15 is a coke hopper. . In FIG. 9, coal
11 is regularly fed to the auxiliary hopper 13 from the coal hopper 3 provided right above the furnace, and the coal 11 is discharged to the coke hopper 15 from the coke discharge port 14 at the bottom of the furnace each time
10 descends naturally and continuously, and is subjected to dry distillation while receiving heat from the combustion chamber 12 from the furnace wall.

However, at present, coke is generally manufactured by a chamber furnace type coke oven, and a continuous vertical coke oven is not used.

This is because when coke is produced in a continuous vertical type coke oven, a hanging phenomenon occurs in the oven due to the expansion of coal or the agglomeration of pyrolysis products. It is considered that it is not possible to efficiently carry out dry distillation, and the properties such as the particle size and strength of the produced coke are inferior to those of the chamber furnace type coke oven.

In order to solve such a problem, the present inventors have proposed a continuous vertical type coke oven disclosed in Japanese Patent Laid-Open No. 5-263078. FIG. 10 is a diagram showing such a continuous vertical coke oven. In the following drawings, the same parts as those in FIG. 9 are designated by the same reference numerals and the description thereof will be omitted.
In FIG. 10, 6 is a coal compression extruder, 7 is a coal pressure transfer machine, 8 is a generated gas recovery chamber, 9 is a generated gas recovery pipe, and 18 is a rotary feeder. As shown in FIG. 10, coal 11
Is sent from the coal hopper 3 to the carbonization chamber 10 by the rotary feeder 18 and extruded into the furnace by the coal compression extruder 6 provided at the upper part of the coke oven. Then, in the carbonization process, the coal compression extruder 6 and the coal pressure transfer machine 7 provided at several places in the furnace belly are used to consolidate and extrude downwards, thereby increasing the bulk density of coal and increasing the bulk density of coke to be produced. Strength is improved.

Further, as a result, the gravity drop and unloading of the coal 11 become smooth. Further, the gas generated in the carbonization process is collected in the generated gas recovery chambers 8 provided at several positions in the height direction of the coke oven, and is extracted to the outside of the furnace by the generated gas recovery pipe 9, so that the generated gas is rising. It does not agglomerate to generate tar and the hanging phenomenon does not easily occur in the furnace.

[0007]

However, the above-mentioned prior art has the following problems.

When coke is produced in the continuous vertical coke oven disclosed in the above-mentioned Japanese Patent Laid-Open No. 5-263078, wet coal having a water content of 7 to 10% is charged as it is, so that the charging density is When the pressure is low, the effect of improving the bulk density is small even when pressurized, and the coke quality is not improved. Also, especially for coal 2
If the bulk density is low because the thermal conductivity at 00 ° C or lower is small, the heating in the carbonization chamber is an indirect heating, and therefore it takes a long time to raise the temperature, which causes a problem of low productivity. In addition, since the operating conditions vary greatly depending on the dry distillation temperature during dry distillation, the compression pressure of the compression extruder at the top of the furnace, and the rotation speed and compression pressure of the rotary pressurizing movers installed at multiple points in the furnace belly, the operating conditions are appropriate. If this is not the case, even if a pressure transfer machine is installed, a hanging phenomenon will occur in the furnace and a stable load unloading will not be possible, and undried coke may drop into the cooling chamber at the bottom of the furnace. There is a problem that coke can be constantly produced with good quality and the production efficiency does not always increase.

The present invention has been made to solve the above-mentioned problems, and provides a coke manufacturing method using a continuous vertical coke oven capable of constantly and efficiently manufacturing good quality coke. The purpose is to

[0010]

The above-mentioned problems can be solved by the following means. In the continuous vertical coke oven, a drying / preheating machine for drying / preheating the coal charged into the continuous vertical coke oven and a hot molding machine for molding the dried / preheated coal into a block shape were installed. The feature is a continuous vertical coke oven. The continuous vertical coke oven according to claim 1, further comprising a coal pressure transfer machine that moves coal downward while pressing the coal at a plurality of locations along the furnace length direction. In the method for producing coke using the continuous vertical coke oven described in 1.
Operating conditions: 300 ℃, the bulk density of the molded product is 0.9 to 1.1 t / m ³ , the temperature of the center of the carbonization chamber in the carbonization zone is 750 to 900 ℃, and the coal descent rate is 0.5 to 1.5 m / h. A method for producing coke, comprising: In the method for producing coke using the continuous vertical coke oven described in 1.
300 ℃, the bulk density of the molded product is 0.9 to 1.1 t / m ³ , the temperature of the center of the carbonization chamber in the carbonization zone is 750 to 900 ℃, the side pressure on the coal is 1 to ² kgf / cm ² , and the coal The furnace descent speed is 0.5 to 1.5 m /
A method for producing coke, characterized in that the coke is produced under the operating conditions of h. In the method for producing coke using a continuous vertical coke oven described in or, as a gas used for the drying and preheating, the combustion exhaust gas from the combustion chamber of the continuous vertical coke oven is used. Coke manufacturing method.

[0011]

According to the continuous vertical coke oven of the present invention,
Before the coal is charged into the coke oven, it is dried by a drying / preheating machine and preheated to about 200 ° C to remove water in the coke. Further, the dried and preheated coal is compacted by a hot molding machine while adding a binder and molded into a block shape, whereby the bulk density of the coal increases. The block-shaped molded product thus molded is loaded into the furnace by the compression extruder at the upper part of the furnace. By doing so, the bulk density of the coal is increased by being further consolidated by the compression extruder in the upper part of the furnace. In this way, the coke strength is improved by suppressing the expansion of coal,
Helps to reduce the weight and unloading of coal. In addition, since the gas generated during the carbonization process is extracted by the recovery devices installed at several points in the furnace height direction, the tar does not agglomerate during the rising of the gas, and heating is performed without causing a hanging phenomenon in the furnace. And reaches the lower part of the carbonization chamber.

In the above-mentioned coke manufacturing process, the bulk density of coal is further increased by consolidating and extruding a block-shaped molded product with a rotary pressure transfer machine provided at several places in the furnace belly. The expansion is suppressed, the coke strength is improved, the weight of coal is reduced and the load of coal is reduced, and the coal is heated in the furnace without causing a hanging phenomenon to reach the lower part of the carbonization chamber.

The reason why the operating conditions are limited in the coke manufacturing method according to the present invention will be described below.

When the drying preheating temperature of coal is less than 200 ° C., the productivity is lowered, and when it exceeds 300 ° C., tar is generated due to thermal decomposition, and agglomeration makes handling difficult. Therefore, the drying preheating temperature of coal was set to 200-300 ℃.

The bulk density of coal is an important factor in maintaining coke productivity and coke strength in coke production. In particular, in the medium-low temperature carbonization method, the carbonization temperature is lowered as compared with the normal high-temperature carbonization method, so the productivity and strength of coke are reduced, and in order to maintain the productivity and strength at normal levels, the bulk density of coal is Need to raise. FIG. 8 is a diagram in which the relationship between the pressure value and the bulk density of a molded product when coal is compacted by using a hydraulic cylinder or the like is experimentally obtained. Although the bulk density of the molded product is improved by increasing the pressure value, a saturation curve is drawn, so the upper limit value was set to 1.1 t / m ³ from the economical point of view. If it is less than 0.9 t / m ³ , the strength of the molded product is weak and handling such as charging becomes difficult,
The lower limit was 0.9t / m ³ .

In the case of a continuous vertical coke oven, the temperature of the center of the carbonization chamber in the dry distillation area is equipped with an extruder and a coal pressure transfer machine, and these facilities are exposed to high temperatures exceeding 900 ° C. Therefore, if the life is shortened and the temperature is lowered to 900 ° C or lower, it becomes possible to replace the conventional silica stone brick with a steel plate and the equipment cost becomes low. Therefore, the upper limit was set to 900 ° C. In addition, since the coke does not undergo second-order shrinkage when the temperature for dry distillation is less than 750 ° C, the coke is finely granulated when subjected to heat treatment, and air permeability is impaired when used in a blast furnace. Therefore, the lower limit was made 750 ° C.

When the pressure of the side pressurizing device exceeds ² kgf / cm ² , the side pressure applied to the coal is high because the hydraulic system becomes large and the equipment becomes expensive. If it is less than / cm ² , the effect of improving the coke quality by pressurization becomes extremely small. Therefore, the lateral pressure on the coal was set to 1-2 kgf / cm ² .

If the descent rate of coal in the furnace exceeds 1.5 m / h, the coal particles cannot be fused and the coke strength is low and the particle size is also small. Further, if it is less than 0.5 m / h, the productivity will be significantly reduced. Therefore, the descent rate of coal in the furnace is 0.5 to 1.5 m.
/ h.

Further, as the drying / preheating gas used in the drying / preheating machine of the present invention, the combustion exhaust gas (high temperature) from the combustion chamber of the coke oven is utilized through the pipe, so that the thermal energy can be effectively utilized.

[0020]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.
In the following figures, the same parts as those in FIG.
The description is omitted. In FIG. 1, 2 is a drying / preheating machine, 4
Is a screw feeder, 5 is a hot molding machine, 16 is a hot air generator, 17 is a blower, and 20 is a binder addition device.

Fluidized bed type drying / preheating machine 2 is prepared by blending several kinds of coking coal so as to obtain desired coke quality.
Coal 11 is dried and preheated to 200 ℃. Then, the dried and preheated coal 11 is sent to the coal hopper 3.

Next, the coal 11 is supplied from the coal hopper 3 to the hot molding machine 5 by the screw feeder 4, molded into a block-shaped molding, and then intermittently charged into the furnace body 1 having a kiln width of 200 mm. To be done. Then, it is compacted and extruded by the compression extruder 6 on the upper part of the furnace body 1 at a pressure of about 1.5 kg / cm ² .
In this way, the bulk density of the coal 11 is increased, the expansion is suppressed, the coke strength is improved, and the gravity drop and unloading of the coal 11 are promoted.

As a result, the furnace wall temperature can be multi-stage heated from 700 ° C. to 900 ° C. without causing the hanging phenomenon in the furnace, and the coal 11 charged from the upper part of the furnace body 1 is
It is carbonized until it reaches the bottom of the carbonization chamber 10.

FIG. 2 is a view showing an embodiment different from that of FIG. 1 of the present invention, and shows an embodiment in the case where a pressure moving machine is provided in the furnace body. In the following figures, the same parts as those in FIG. In FIG. 2, 7 is a rotary pressurizing mobile machine, 8 is a generated gas recovery chamber, and 9 is a generated gas recovery pipe.

Also in this embodiment, as in the embodiment shown in FIG. 1, the coal 11 is dried and preheated by the drying / preheating machine 2 and molded into a block-shaped molded product by the hot molding machine 5, and then the furnace main body. Charged intermittently at 1. And the furnace body 1
Pressure compaction at a pressure of at compressor extruder 6 of about 1.5 kg / cm ² top, while being extruded at rotated pressurized pressure transfer motive 7 provided in two places of the furnace abdominal 1.5 kg / cm ² approximately Is consolidated and extruded. In this way, the bulk density of the coal 11 is increased, the expansion is suppressed, the coke strength is improved, and the gravity drop and the unloading of the coal 11 are promoted, and the rack hanging phenomenon occurs in the furnace. Without changing the furnace wall temperature from 700 ℃ to 900
It can be multi-stage heated to 0 ° C., and the coal 11 charged from the upper part of the furnace body 1 is carbonized by the time it reaches the lower part of the carbonization chamber 10.

FIG. 3 is a view showing an embodiment different from FIGS. 1 and 2 of the embodiment of the present invention, in which combustion exhaust gas from the furnace body is used as the gas used for drying and preheating. In FIG. 3, the same parts as those in FIG.
The description is omitted. In FIG. 3, 19 is a heat exchanger.
Combustion exhaust gas from a part of the generated gas recovery pipe 9 is used as a heat exchanger.
It is sent to 19, where the heat of combustion exhaust gas is exchanged with the gas used for drying and preheating. For this reason, a hot air generator is not required, and energy can be saved.

FIGS. 4 to 7 show the preheating temperature, bulk density, and pressure of the side pressurizer of the coal molding when the temperature of the center of the carbonization chamber in the carbonization zone is set to a constant heating pattern from 750 to 900.degree. It is a figure showing the relation of descent rate, the quality of coke, and productivity. Here, the JIS drum strength indicates the strength of coke, the higher the value, the better the quality, and the JIS reactivity indicates the reactivity to CO ₂ , and the lower the value, the better the quality. From the results of FIGS. 4 to 7, the operating conditions in the present invention are
Drying temperature of coal is 200-300 ℃, bulk density of molded product is 0.9
~1.1t / m ^3, the temperature of the coking chamber center in the carbonization zone 750-90
It has been confirmed that optimum operation can be performed with good quality and high productivity if the temperature is 0 ° C, the lateral pressure on the coal is 1-2 kgf / cm ³ , and the rate of coal descent in the furnace is 0.5-1.5 m / h. Was done.

[0029]

As described above, according to the present invention, it is possible to efficiently produce high quality coke.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment different from FIG. 1 of the present invention.

FIG. 3 is a diagram showing an embodiment different from FIGS. 1 and 2 of the present invention.

FIG. 4 is a diagram showing the relationship between the preheating temperature of coal and the quality and productivity of coke.

FIG. 5 is a diagram showing the relationship between the bulk density of coal and the quality and productivity of coke.

FIG. 6 is a diagram showing the relationship between the pressure applied to coal and the quality and productivity of coke.

FIG. 7 is a graph showing the relationship between the descent rate of coal and the quality and productivity of coke.

FIG. 8 is a diagram showing a relationship between a pressure value and a bulk density.

FIG. 9 is a diagram showing an example of a conventional technique.

FIG. 10 is a diagram showing an embodiment different from FIG. 9 of the conventional technique.

[Explanation of symbols]

 1 Furnace Main Body 2 Drying / Preheating Machine 5 Hot Forming Machine 7 Rotary Press Transfer Machine 9 Generated Gas Recovery Pipe 10 Carbonization Chamber 11 Coal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoji Fukada 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Day Steel Pipe Co., Ltd. (72) Inventor Takashi Ueda 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (5)

[Claims] 1. A continuous vertical coke oven for drying and preheating coal to be charged into the continuous vertical coke oven.
A continuous vertical coke oven, which is equipped with a preheating machine and a hot molding machine for molding dried and preheated coal into blocks. 2. The continuous vertical coke oven according to claim 1, further comprising: a coal pressure transfer machine for moving coal downward while pressing the coal at a plurality of locations along the furnace length direction. Continuous vertical coke oven. 3. The method for producing coke using the continuous vertical coke oven according to claim 1, wherein the coal predrying temperature is 200 to 300 ° C., and the bulk density of the molded product is 0.9 to 1.1 t /.
m ^3, 750 to 900 ° C. The temperature of the coking chamber center in the carbonization zone,
A method for producing coke, which is characterized in that coal is produced under operating conditions of a descent rate of 0.5 to 1.5 m / h in the furnace. 4. The method for producing coke using the continuous vertical vertical coke oven according to claim 2, wherein the preheating temperature of coal is 200 to 300 ° C., and the bulk density of the molded product is 0.9 to 1.1 t /.
m ^3, 750 to 900 ° C. The temperature of the coking chamber center in the carbonization zone,
A method for producing coke, characterized in that the coke is produced under the operating conditions of a side pressure of 1 to ² kgf / cm ^{2 on} the coal and a descent rate of the coal in the furnace of 0.5 to 1.5 m / h. 5. A method for producing coke using a continuous vertical coke oven according to claim 1 or 2, wherein a gas used for the drying and preheating is from a combustion chamber of the continuous vertical coke oven. A method for producing coke, which comprises utilizing the combustion exhaust gas of the above.