JP2842702B2 - Transportation method of humidified coal for coke feed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting humidified coal for coke raw materials.

[0002]

2. Description of the Related Art In general, a humidifying coal facility for adjusting the moisture content of coal to a predetermined value reduces the moisture content of coal from 8 to 12% to 6% or less. The aim is to increase the bulk density of the coal charged into the coke oven by lowering the water content. Can be expected. Also, conventional coal moisture of 8 to 12% could not be used because of insufficient strength, whereas coal moisture of 6% or less can use a large amount of finely caking coal and thermal coal, thus reducing the cost of raw coal and reducing the cost of raw coal. It is expected that the range of choice of coking coal can be expanded.

[0003] As described above, the coking coal humidity control equipment has a great merit, and has been rapidly spread as an essential equipment of a coke oven in an ironworks. However, on the other hand, the coal dried by the humidified coal facility is easily blown off by wind or the like, and easily causes problems such as dust scattering. In recent years, environmental requirements for factories have become increasingly severe, and it has become necessary to take appropriate measures against the problem of dust scattering.

[0004]

As a countermeasure against dust scattering of coal, the following four items have been generally implemented. (1) Cover the belt conveyor with a hood or the like. (2) Sprinkle water on the humidified coal surface.

[0005] (3) The surface of the humidified coal is coated with oil, tar, resin, etc., or is made into pseudo-particles (JP-A-62-41286).
No., JP-A-62-135589). (4) Transport by pipe conveyor. However, the above (1) and (4) have a problem that the equipment cost is high. Further, it is difficult to make the surface particles into pseudo particles by the water spraying of the above (2), so that a large amount of water is required to prevent scattering of dust, and there is a problem that energy used for drying is wasted. Further, the above (3) has a problem that the cost of the resin and the like is high, the number of kneading steps is increased, and coal adheres (fixes) to the conveyor due to the resin.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive and effective measure for preventing dust scattering during transportation of a humidified coal for coke raw material by a conveyor in order to solve the above problems.

[0007]

As described above, the scattering of coal dust has become noticeable after the operation of the humidifying coal facility. This is because when the coal is dried, the coal is bound by the capillary action of water, and the quasi-particulated coal is disintegrated and the fine powder is present alone. Conventional coal containing 8 to 12% of moisture becomes quasi-particles in a handling process such as mining, transportation, and yard stacking, and the fine powder does not exist alone. The present invention
The purpose of the present invention is to focus on utilizing the quasi-particled coal for preventing dust scattering.

The present invention relates to a method for transporting humidified coal for coke raw materials discharged from a humidified coal facility for heating coal to humidify coal moisture to a predetermined value. At the entrance side, the coal is divided into two systems and the amount of coal in one system is reduced to 80% of the total amount of coal.
~ 95%, passing through the humidified coal facility to adjust the coal moisture to a predetermined value, and bypassing another system of coal without passing through the humidified coal facility to remove unhumidified coal with high moisture content. Wherein the surface of the humidified coal loaded on the conveyor at the outlet side of the humidified coal equipment is covered with an additional coating so as to prevent coal dust from being scattered and transported. It is a method of transporting charcoal.

[0009]

[Operation] In order to form pseudo-particles of coal, it is necessary to give a suitable moisture of 8 to 15% and exercise such as rolling. Even if water is sprinkled on the outlet side of the humidified coal, the effect of coal dust scattering cannot be sufficiently obtained because rolling motion does not occur. As described above, it is difficult to make coal into pseudo particles,
Coal must be supplied into a rotating drum or pan in order to turn particles that have collapsed into pseudo particles. This is practically difficult due to high equipment costs.

Therefore, in the present invention, a part of the raw coal is put on a dry humidified coal while leaving the formed pseudo-particles without passing through the humidified coal facility to prevent the scattering of coal powder. It was done. By doing so, the dried coal is sandwiched between the conveyor and the quasi-granulated coal so that dust is not scattered. In addition, no special equipment is required for forming pseudo-particles, and energy loss such as spraying water on the dried coal is eliminated.
The reason for adjusting the humidity to be 80% to 95% is as follows. (1) If it is less than 80%, the proportion of unconditioned coal is too large, and the advantage of the conditioned coal method is reduced. (2) 95%
Exceeding this is because the unconditioned moisture coal cannot cover the moisture conditioning coal layer on the conveyor, and coal dust is generated.

FIG. 2 shows the relationship between the frequency of water spraying on a belt conveyor for dust scattering of coal that has bypassed the humidification coal facility. From FIG. 2, it can be seen that if 5 to 20% of coal is bypassed, dust scattering hardly becomes a problem.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus configuration suitable for implementing the present invention. Coking coal is transported from the yard 1 to a number of blending tanks 2 by a coal transport conveyor 3a. In the blending tank 2, several kinds of coal are cut out according to a blending ratio so as to obtain a predetermined quality, transported by a coal transport conveyor 3b, and then dried by a humidified coal facility 5. In the present invention, the raw coal conveyed by the conveyor 3b is distributed by the branch chute 4, 80 to 95% of the coal is sent to the humidification coal facility 5 by the coal conveyor 3c, and the remaining 5 to 15% of the coal is coal. The humidified coal equipment 5 is bypassed by the conveyor 3d, and is put on the dry coal placed on the humidified coal conveyor 3e at the outlet side of the humidified coal equipment 5 to cover the same. Thereafter, it is transported to the coke oven 6 by the humidified coal conveyor 3e.

[0013]

As described above, according to the present invention,
Dust generation during transport of humidified coal can be effectively prevented without using expensive equipment such as a pipe conveyor or using a special binder.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram showing a coal transport processing flow according to an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the amount of coal bypassing humidified coal and the frequency of watering.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coal yard 2 Blending tank 3 Coal conveyor 4 Branch chutes 5 Conditioning coal equipment 6 Coke oven

Claims (1)

(57) [Claims] 1. A method for transporting humidified coal for a coke raw material discharged from a humidified coal facility for raising the temperature of coal to humidify the moisture of the coal to a predetermined value, comprising: The coal is divided into two systems, and the amount of coal in one system is set to 80 to 95% of the total amount of coal and passed through the humidifying coal facility to adjust the coal moisture to a predetermined value. By bypassing without passing through the humidified coal equipment and leaving the unconditioned humidified coal with a high moisture content, the surface of the humidified coal loaded on the conveyor at the output side of the humidified coal equipment is covered by being added. A method for transporting humidified coal for coke raw materials, wherein transport is performed while preventing scattering of coal dust.