JPH031208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing scattering of coal dust in outdoor coal storage areas in call centers, coal-fired power plants, etc.

(Conventional technology) Currently, Japan is trying to diversify its energy sources, and as part of this effort, coal is being reconsidered.
In particular, since coal imported from overseas contains a large amount of small particles, the scattering of coal dust from coal storage sites has become a hot topic as a pollution problem. For this reason, methods are being considered to prevent the scattering of coal dust by concealing the coal by storing it indoors or storing it in silos, but this is not practical if the amount of coal stored is large because the equipment cost would be enormous.

Therefore, coal is stored outdoors in call centers, coal-fired power plants, etc. that store a large amount of coal.
The most effective method for preventing the scattering of coal dust is the method of moistening the coal with a large number of water spray devices, as shown in Japanese Patent Application Laid-open No. 193844/1983. This method is outlined in Figure 2, where No. 1 is placed around the coal pile.
Water spray devices No. 1 to No. 12 are arranged, and when there is no wind or weak wind, water is sprayed from all the water spray devices, but when there is strong wind from direction A, No. 1, No. 2, and No.
3. Release from No.4, No.7, No.8, No.9, No.10,
When there is strong wind from direction B, No.1, No.3, No.5, No.
In this method, water is sprayed from No. 7, No. 9, and No. 11, and the water from the windward side is scattered to the leeward side by wind pressure, thereby injecting water into the entire coal pile. However, according to this method, when there is strong wind from direction B, No. 2, No. 4, No. 6, No. 8, No. 10, No.
Since water spraying equipment such as No. 12 does not operate, in large-scale coal storage yards where the long side of the coal pile exceeds 300 m, there is a drawback that sufficient water cannot be injected into the leeward end. If the water discharge amount or water pressure is increased to eliminate these drawbacks, there are problems such as the water discharge distance becomes too large in weak winds, resulting in wasted water discharge, and equipment costs including control equipment increase. Ta.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and can be used even in weak winds without increasing the water discharge amount or water discharge pressure or causing waste in the water discharge amount. This method was developed with the aim of preventing the scattering of coal dust by spraying an appropriate amount of water over the entire coal pile.

(Means for Solving the Problems) The present invention provides four or more water discharging devices on each long side among the water discharging devices provided around the rectangular coal pile, and divides these into two or more systems. Each system is arranged so as to be placed inside each other, and when there is a strong wind in the longitudinal direction of the coal pile, water is sprayed from the selected system of the water discharge device on the short side located upwind and the water discharge device on the long side. In addition, the system is characterized by the fact that water is dispersed over the entire coal pile using wind pressure.

Next, the present invention will be explained in more detail with reference to FIG. 1. 1 is a rectangular coal pile, 2 and 3 are each coal pile 1.
A water spray device installed on the outer periphery of one short side of the
4 and 5 are water discharging devices installed on the opposite short side in a foreign country. Further, 6, 7, 8, and 9 are water discharging devices provided on the outer periphery of the long side of each coal pile 1, but in the present invention, the water discharging devices 6, 9 on each long side are
In numbers 7, 8, and 9, each column has four or more, and each column is divided into two or more systems, and the systems are arranged so as to be nested in each other. That is, in the case shown in the figure, the water discharging devices in each row are A, B, and C.
and D, E and F, and G and H, which are arranged alternately as shown in the figure, but the number of series and the method of arrangement can be changed as appropriate. Each of the water discharging devices 2 to 9 is mounted on a table 12 whose angle with respect to a horizontal plane can be changed by a first motor 11, as shown in FIG.
A shaft 14 that rotates reciprocatingly is provided, and a nozzle 15 perpendicular to the shaft 14 is attached to the tip of this shaft 14, and the elevation angle of the nozzle relative to the ground surface is changed by a first motor 11. and the second motor 13 while maintaining its elevation angle.
The nozzle 15 can be reciprocated and rotated in a fan-like manner by the second motor 13. When the wind is weak, the nozzle 15 can be moved in a plane having a preset elevation angle.
The nozzle 15 performs a reciprocating and reversing rotational movement, or the nozzle 15 performs a reciprocating and reversing rotational movement in a plane having a preset elevation angle by the second motor 13, and further, 1
The motor 11 is operated to change a preset elevation angle and directly water the coal pile. However, in the case of strong winds, the water spray device located on the windward side increases the angle of elevation of the nozzle's reciprocating and reversing rotational movement surface relative to the ground surface to 75 degrees or more, preferably close to 90 degrees, and increases the angle of elevation of the nozzle's reciprocating rotational movement surface to 75 degrees or more, preferably close to 90 degrees, so that the surface facing almost vertically or slightly toward the coal storage pile 1 is The structure is such that water is released inside the coal pile, and wind pressure is used to sprinkle water onto the coal storage pile.

In the present invention, when there is no wind or weak wind, water is discharged directly from all the water discharging devices toward the coal pile 1 as in the conventional case, and the coal pile 1
For strong winds in the direction of the short side of the road, for example strong winds in the A direction, the water spraying devices 6 and 8 located upwind will spray water by increasing the angle of elevation of both systems A and B and E and F, as described above. Similarly to the conventional method, water is scattered over the entire coal pile 1 using wind pressure. At this time, the water discharging devices 7 and 9 may discharge water or stop discharging water, and the water discharging devices 2, 3, 4, and 5 on the short side may discharge water directly toward the coal pile 1 or Water will be sprayed during strong winds with a large angle of elevation.

On the other hand, in response to strong winds in the longitudinal direction of the coal pile 1, for example strong winds in direction B, the water discharge devices 2 and 3 on the short sides located on the windward side are made to discharge water with a large angle of elevation, and the water discharge devices 2 and 3 on the short sides located on the windward side are Water discharge devices 6, 7, 8, and 9 of a selected system, such as A, C, E,
Water is sprayed directly from G or water is sprayed at a large angle of elevation. As shown in the figure, there are four or more water discharging devices on the long side, and each system divided into two or more systems is arranged so as to be inserted into each other, so water is discharged from water discharging devices 6, 7, 8, and 9. can sufficiently reach the end of the coal pile 1. Moreover, since water is discharged from the selected system among the divided systems into two or more systems, there is no waste in the amount of water discharged compared to the case where water is discharged from the entire system. In this case, the water discharge devices 4 and 5 on the leeward side may be stopped. Also, one of the water spray devices 7 and 8
As long as it can rotate 360 degrees, there is no problem even if the other one is stopped.

(Effects of the Invention) As is clear from the above description, the present invention has the following advantages:
Even for long coal piles over 300 meters long, water spray equipment can inject the necessary and sufficient amount of water to the entire coal pile without increasing the water discharge amount or water discharge pressure of each water discharge device. As a method for preventing the scattering of coal dust that saves money and waste of water, it will greatly contribute to the development of industry.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of a water spray device according to the present invention, FIG. 2 is a layout diagram of a water spray device in a conventional method, and FIG. 3 is a partially cutaway front view showing an example of a water spray device. 1: Coal storage pile, 2, 3, 4, 5: Water discharge device on the short side, 6, 7, 8, 9: Water discharge device on the long side.

Claims (1)

[Claims] 1. Of the water discharging devices installed around the rectangular coal pile, there should be four or more water discharging devices on each long side, and these should be divided into two or more systems and each system should be placed inside each other to prevent coal storage. When there is strong wind in the longitudinal direction of the mountain, water is sprayed from the water spray device on the short side located upwind and the water spray device on the long side that is selected, and the water is scattered over the entire coal pile due to wind pressure. A method for preventing scattering of coal dust.