JPS59182105A - Method of coal stacking for prevention of dust scattering - Google Patents

Abstract

PURPOSE:To prevent coal dust scattering in coal storing in a chemical plant coal storage yard by placing pulverized coal mixed with large-diameter coal in the lower layer and stacking washed, large-diameter coal on the top layer in forming a coal sediment. CONSTITUTION:Coals each particle of which is large in diameter are placed together with pulverized coal in a lower layer 7 of a coal sediment 3. In a top layer 6, coals, which have been washed and are free from pulverized coal, are stacked. Further, water sprinkling 2 is carried out as necessary. With this contrivance, scattering of fine coal can be prevented with less frequent water sprinkling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for use in, for example, coal-fired power plants, coal storage yards such as chemical factories, coal storage yards and ore storage yards of steel plants, outdoor powder storage areas such as coal and ore loading yards in ports, etc. The present invention relates to a method for depositing coal, etc., which prevents the scattering of dust, which can be applied.

Figure 1 shows an example of conventional measures to prevent the scattering of coal dust from coal piles.

Conventionally, an upright coal dust scattering prevention wall 1 as shown in FIG. 1 was provided on the windward side of a coal pile 3, and a water sprinkling nozzle 2 was further provided between the coal piles 3 to perform regular water sprinkling. This prevented coal dust from being blown away by the wind.

FIG. 2 is a cross-sectional view showing the state of coal particles in a conventional coal pile 3. In the case of FIG. 1, coal 4 with a normal particle size and pulverized coal 5 with a small particle size are A mixture of pulverized coal 5 was present on the surface of the coal pile 3, and this pulverized coal 5 dried and was scattered by the wind, so the effect of preventing dust scattering was not sufficient.

Therefore, with the deposition method shown in Figure 1, when the atmosphere is dry or when there are strong winds, a sufficient dust-proofing effect cannot be obtained unless watering is performed almost continuously, and a large amount of water is consumed. There was a drawback.

An object of the present invention is to provide a method for depositing coal, etc., which increases the effect of preventing dust scattering and prevents dust scattering without requiring a large amount of water sprinkling.

In order to achieve the above-mentioned object, the present invention provides that when coal etc. is stored in a coal storage yard, coal with large particle size and pulverized coal are deposited in the lower layer in a mixed manner, and the surface layer is washed in advance to reduce the particle size. Coal that can effectively prevent dust from scattering by depositing large coal or mainly large-grained coal that has been washed away from the pulverized coal that has adhered to the surface of the lump to form a coal pile. The present invention aims to provide a deposition method such as the following.

Examples of the present invention will be explained below with reference to the drawings. Figure 3 is a cross-sectional view showing the state of coal particles after washing when carrying out the method of the present invention, and Figure 4 shows one embodiment of the present invention. A cross-sectional view of a coal pile is shown.

In the figure, 4 is coal or lumps with large particle diameters that have been washed with tap water or the like. 5 is pulverized coal, 2 is a water sprinkling nozzle in a sprinkling state, 6 is a surface layer where washed coal is deposited, and 7 is a lower layer where large particle size coal and pulverized coal are mixed.

Next, to explain the effect, in Figs. 3 and 4,
In Table M6, washed coal with large particle size (approximately 5φfi or more is effective) or coal with mainly large particle size after washing off the pulverized coal adhering to the surface of the lump is used as an IF product. By covering the surface of coal pile 3 with step 6,
If the atmosphere is dry and strong winds are blowing, it is sufficient to sprinkle water from the water nozzle 2 as necessary.
A small amount of water can provide effective dust control, unless dust is present.

Further, in 8R, the coal is washed to remove the pulverized coal 5 in order to be deposited on the table M6, and water containing this pulverized coal is poured into the lower layer 7. In addition, when using some of the stored coal or adding +11 coal, it is preferable to remove it from the leeward side to make it less susceptible to wind effects. Although the illustration of coal washing is omitted, it is sufficient to install a wire mesh sieve with an opening with a diameter of 5 ml in the middle of the coal transfer process and spray water from the opening. .

The present invention is constructed as described in detail below, and since it does not require much water sprinkling, the water saving effect is large, the time required for water sprinkling can be shortened, and the scattering of dust can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the conventional state of coal accumulation, FIG. 2 is an enlarged sectional view of the coal deposit in FIG. 1, and FIG. 3 is an enlarged sectional view of the coal deposit according to the method of depositing coal, etc. of the present invention. Figure, 4th
The figure is a front sectional view showing the state of accumulation of coal etc. in the method of the present invention. Explanation of the main parts of the diagram 3 - Coal pile 4 - Coal or lumps with large particle size 5 - Pulverized coal 6 - Surface layer 7 - Lower layer Patent applicant Mitsubishi Heavy Industries, Ltd. Figure 1/- Figure 2

Claims (1)

[Claims] When coal, etc. is stored in a coal yard, the lower layer is deposited with a mixture of large-grained coal and pulverized coal, and the surface layer is preliminarily washed so that the large-grained coal or pulverized coal adheres to the surface of the lumps. A method for depositing coal, etc., which prevents the scattering of dust, characterized by depositing mainly coal having a large particle size after washing away pulverized coal to form a coal pile.