JP2001220585A - Coal moisture-conditioning system equipped with wet solid-gas separation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coal moisture-condition system which adjusts the moisture of a dried coal powder into a non-dusting state, yields a dried coal without requiring the addition of organic which may cause odor problem of coal moisture-condition system or dusting resulting from insufficient kneading reduces the equipment cost. SOLUTION: In the coal moisture-conditioning system, dried coals and dried coal powers dried in a fluidized bed dryer 1 are classified, and the dried coals and a slurry containing the dried coal powders recovered from an exhaust gas from the fluidized bed dryer 1 by a wet solid-gas separation device 7 are kneaded and mixed in a kneader 8 for moisture conditioning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal humidification method in which raw coal is dried and classified by a fluidized bed dryer before charging into a coke oven, and the classified dry coal powder is subjected to wet-solid separation to control humidity. Equipment related.

[0002]

2. Description of the Related Art In the production of coke, as a method of drying raw coal, a coal humidity control equipment using a fluidized bed dryer is used. In a coal humidity control equipment using this fluidized bed dryer, a large amount of exhaust gas is generated due to the characteristics of the fluidized bed dryer. This flue gas contains a large amount of dry coal powder dried to about 0% of adhering moisture, and the dried coal powder is collected by a large bag filter type dust collector. The collected dry coal powder causes a large amount of dust to be generated in a subsequent process.

In order to prevent dust generation in the conventional coal moisture conditioning treatment, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-31471, an organic binder such as tar is added to the collected dry fine coal. And a water slurry to which water has been added, subjected to wet granulation, and then subjected to a dehydration treatment.

[0004]

However, in the conventional coal humidity control, there is a problem that equipment cost is high because an expensive and large bag filter type dust collector is used.

Further, addition of an organic binder such as tar cannot sufficiently prevent dust generation due to insufficient kneading due to its high viscosity, and also causes problems such as odor due to an unpleasant odor of the organic binder.

[0006] Coal moisture affects the quality of coke,
Usually, 5.0% of coal moisture is considered to be a limit due to dust generation problem, so it is difficult to reduce coal moisture to achieve a quality improvement effect.

Accordingly, the present invention provides a method of collecting dry coal powder, which is a cause of dust generation, into a coal moisture which does not generate dust selectively by collecting it with a wet solid-gas separation device, thereby causing a problem of odor or insufficient kneading. To provide a coal-humidifying equipment using a wet-type gas-solid separation device that can obtain dry coal without requiring the addition of an organic binder that causes dust generation by the method and can reduce equipment costs. It is.

[0008]

SUMMARY OF THE INVENTION A coal humidity control system of the present invention is a coal humidity control system in which raw coal is dried by a fluidized bed drier before charging the coke into a coke oven. A fluidized bed dryer that classifies dry coal and dry coal powder,
A coal-conditioning system comprising: a wet-solid gas separation device that collects the dried coal powder from the exhaust gas of a fluidized bed dryer to form a slurry; and a kneader that kneads and mixes the dried coal and the slurry to adjust the humidity. Wet equipment (2) a fluidized bed dryer for drying wet coal and classifying it into dry coal and dry coal powder; and a wet solid-gas separation device for collecting the dry coal powder from exhaust gas of the fluidized bed dryer to form a slurry. And a kneading machine for kneading and mixing the slurry and dry coal powder discharged from the environmental dust collecting facility in the coal humidity controlling system or another facility to control the humidity. A fluidized bed dryer for drying and classifying wet coal into dry coal and dry coal powder, a dry-solid-gas separator for collecting the dry coal powder from the exhaust gas of the fluidized-bed dryer, and an exhaust gas of the dry-solid-gas separator Wet-Solid Separation of Dry Coal Powder Collected from Water and Made into Slurry And a kneader for kneading and mixing the slurry and the dry coal powder collected by a dry-type solid-gas separator to adjust the humidity. (4) Dry the wet coal to dry coal. Fluidized bed dryer classifying into dry coal powder, dry solid-gas separator for collecting the dry coal powder from the exhaust gas of the fluidized bed dryer, and dry coal powder collected from the exhaust gas of the dry solid-gas separator A wet-solid separation device for collecting and slurrying, kneading and mixing the slurry, the dry coal classified by the fluidized-bed dryer, and the dry coal powder collected by the dry-solid separation device; The present invention is characterized by a coal humidity control equipment provided with a kneader for controlling the humidity.

[0009]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a large amount of exhaust gas generated in a fluidized bed dryer is guided to a wet dust collector, and cooled and cooled.
Dust is removed, and the dried fine powder that has been removed is led to a kneader in a state of slurry or sludge sufficiently mixed with water,
Kneaded and mixed with dry charcoal. The coal after kneading / mixing has a predetermined water content and is dry coal that does not generate dust.

[0010]

Embodiment 1 FIG. 1 is a view showing one embodiment of a coal humidity control equipment used in the present invention.

In the fluidized bed dryer 1, a first fluidizing gas inlet 2 and a second fluidizing gas inlet 3 are continuously provided in the direction of coal transfer, and are connected continuously. Fluidization room 4
Are formed. From the lower part of the first fluidizing gas inlet 2 and the second fluidizing gas inlet 3, a hot air generator 5
The hot air generated in the above is blown as coal fluidizing gas, and the charged wet coal is fluidized and dried.

An exhaust gas pipe 6 for discharging exhaust gas and dry coal powder is provided on the ceiling of the fluidizing chamber 4, and is connected to a wet solid-gas separation device 7 for separating exhaust gas and dry coal powder. For example, a venturi scrubber of a type in which water is circulated by a pump P is used as the wet solid-gas separation device 7.

The slurry containing the dried coal powder collected by the wet-type solid-gas separation device 7 is mixed with a kneader 8 by a slurry pump 7a.
Is supplied together with the dried coal discharged from the fluidized bed dryer 1 and kneaded and mixed. The slurry can be provided with a dehydrator as needed to adjust the water content. As the kneader 8, a known kneader such as a pin mixer is used.

The dried coal discharged from the kneader 8 is conveyed on a conveyor 9. The exhaust gas discharged from the dust collector is
Dissipated from the chimney 10.

Next, the humidity control of the coal by the coal humidity control equipment will be described.

The wet coal containing water is first supplied to the fluidized bed drier 1
And dried by fluidization, heated to a predetermined temperature, and classified into dry coal and dry coal powder. The classified dry coal powder is introduced into a wet solid-gas separation device 7 through a pipe 6 and collected,
Separated from exhaust gas.

Dry coal discharged from the fluidized bed dryer 1;
The slurry containing the dried coal powder collected by the wet-solid gas separation device 7 is supplied to the kneader 8 and kneaded. The kneading is performed by mixing the dried coal and the slurry on the output side of the fluidized-bed dryer 1 so that the amount of the dried coal after kneading and mixing becomes 4% based on the amount and moisture of the coal collected by the wet-solid gas separation device 7. Each moisture,
The amount is adjusted.

As shown in the balance of FIG.
And amount of dry coal dried by the method, wet-solid gas separator 7
By adjusting the water content and amount of the slurry containing the dried coal powder collected in the above, the moisture concentration of the dried coal powder, which causes dust generation, can be selectively increased, and without using an organic binder, kneading The dry coal discharged from the machine 8 can reduce the coal moisture, which is usually 5% or more due to dust generation, to 5% or less which does not generate dust.

Embodiment 2 FIG. 2 is a diagram showing another embodiment of a coal humidity control system equipped with a fluidized bed dryer according to the present invention. The same components as those shown in FIG. Is omitted.

In this embodiment, the dried coal dried by the fluidized bed dryer 1 is conveyed to a coke oven as it is.

On the other hand, the slurry containing the dried fine powder collected by the wet solid-gas separation device 7 is supplied to the kneading machine 8 together with the dust collected coal powder discharged from the environment of the coal humidity control equipment or other equipment. The supplied coal is kneaded and mixed, and the dry coal discharged from the kneader 8 is adjusted to have a moisture content of 4%, and is conveyed to a coke oven. Further, the slurry may be provided with a dehydrator before kneading and mixing, if necessary, to adjust the water content.

Embodiment 3 FIG. 3 is a view showing another embodiment of a coal humidity control system equipped with a fluidized bed dryer according to the present invention. The same components as those shown in FIG. Is omitted.

In this embodiment, a dry solid-gas separation device 11 is provided between the fluidization chamber 4 and the wet solid-gas separation device 7.

The dried coal dried in the fluidized bed dryer 1 is conveyed to a coke oven as it is. On the other hand, the dry coal powder collected by the dry solid-gas separator 11 is mixed with the slurry containing the dry fine powder collected by the wet solid-gas separator 7 in a kneader 8.
The dry coal discharged from the kneader 8 is adjusted to 4% moisture and conveyed to a coke oven. Further, the slurry may be provided with a dehydrator before kneading and mixing, if necessary, to adjust the water content.

Embodiment 4 FIG. 4 is a view showing another embodiment of a coal humidity control system equipped with a fluidized-bed dryer of the present invention. The same components as those shown in FIG. Is omitted.

In this embodiment, a dry solid-gas separation device 11 is provided between the fluidizing chamber 4 and the wet solid-gas separation device 7.

Dried coal dried in the fluidized bed dryer 1;
The slurry containing the dry coal powder collected by the dry-solid gas separation device 11 and the dry fine powder collected by the wet-solid gas separation device 7 was supplied to the kneader 8 to be kneaded and mixed, and discharged from the kneader 8. The dried coal is adjusted to a moisture content of 4% and transported to a coke oven. Also, the slurry may be mixed and kneaded as necessary.
It is also possible to install a dehydrator before mixing and adjust the water content.

[0028]

The effects of the present invention are as follows.

(1) By arranging a wet dust collector in a conventional expensive and large bag filter dust collector, equipment costs can be greatly reduced.

(2) The dry coal powder, which is the largest cause of dust generation in the transportation process, is collected by a wet-solid gas separation apparatus, and is sufficiently immersed in water so as not to generate dust. It becomes possible to collect. As a result, coal moisture, which is usually limited to 5.0% due to dust generation problems, can be reduced to 4.0% under the same dust generation condition, and the dust generation problem is fundamentally reduced. Can be resolved. In addition, since coal moisture is reduced to 4%, energy saving effects,
A quality improvement effect is obtained.

(3) Since there is no need to use an organic binder, the problem of odor caused by the organic binder is solved.

(4) Coal powder collected by environmental dust collection and the like can be effectively used.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a coal humidity control facility used in the present invention.

FIG. 2 is a view showing another embodiment of the coal humidity control equipment used in the present invention.

FIG. 3 is a view showing another embodiment of the coal humidity control equipment used in the present invention.

FIG. 4 is a view showing another embodiment of the coal humidity control equipment used in the present invention.

[Explanation of symbols]

 1: fluidized bed dryer 2: first fluidizing gas inlet 3: second fluidizing gas inlet 4: fluidizing chamber 5: hot air generator 6: exhaust gas pipe 7: wet solid-gas separator 7a : Slurry pump 8: Kneader 9: Conveyor 10: Chimney 11: Dry solid-gas separator

Continued on the front page (72) Inventor Tatsuhiko Egami 46-59, Nakahara, Tobata-ku, Kitakyushu F-term in Nippon Steel Plant Design Co., Ltd. (reference) 4H012 MA01 RA05

Claims (4)

[Claims] 1. A coal-humidifying facility for drying raw coal by a fluidized-bed dryer before charging the raw coal into a coke oven, wherein a fluidized-bed dryer that dries wet coal and classifies the coal into dry coal and dry coal powder; A wet-solid separation device that collects the dry coal powder from the exhaust gas of the fluidized bed dryer to make a slurry, and a kneader that kneads and mixes the dry coal and the slurry to adjust the humidity. Characteristic coal humidity control equipment. 2. A coal-humidifying facility for drying raw coal by a fluidized-bed dryer before charging the raw coal into a coke oven, wherein a fluidized-bed dryer that dries wet coal and classifies the coal into dry coal and dry coal powder; A wet solid-gas separation device that collects the dried coal powder from the exhaust gas of the fluidized bed dryer and converts it into a slurry, and the dry coal discharged from the slurry and the environmental dust collection equipment of the coal humidity control system or other equipment A kneading machine for kneading and mixing flour with a kneader for controlling humidity. 3. A coal-humidifying facility for drying raw coal by a fluidized-bed dryer before charging the raw coal into a coke oven, wherein a fluidized-bed dryer that dries wet coal and classifies the coal into dry coal and dry coal powder; A dry-solid-gas separator for collecting the dried coal powder from the exhaust gas of the fluidized-bed dryer, and a wet-solid-gas separator for collecting the dried coal powder collected from the exhaust gas of the dry-solid gas separator to form a slurry. And a kneader for kneading and mixing the slurry and the dry coal powder collected by a dry-type solid-gas separator to adjust the humidity. 4. A coal-humidifying facility for drying raw coal by a fluidized-bed dryer before charging the raw coal into a coke oven, wherein a fluidized-bed dryer that dries wet coal and classifies the coal into dry coal and dry coal powder; A dry-solid-gas separator for collecting the dried coal powder from the exhaust gas of the fluidized-bed dryer, and a wet-solid-gas separator for collecting the dried coal powder collected from the exhaust gas of the dry-solid gas separator to form a slurry. A kneader for kneading and mixing the slurry, the dried coal classified by the fluidized bed dryer, and the dried coal powder collected by a dry-type solid-gas separator to adjust the humidity. Characteristic coal humidity control equipment.