JPH072043Y2 - Coal blockage prevention device for mill feed pipe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a coal clogging for preventing a coal clogging of a coal feeding pipe to a mill having a ball or a roller for pulverizing coal and stably feeding the coal. The present invention relates to a prevention device.

[Conventional technology]

FIG. 4 shows an example of a schematic configuration of a mill equipped with a conventional coal clogging prevention device. In the figure, 1 is a mill main body, 2 is a crushing ball for crushing coal, 3 is a coal feeding pipe, and 4 is a water film injection device as a coal clogging prevention device. As a conventional example of this kind, there is JP-A-59-139950.

The water from the water injection device 4 forms a water film on the inner wall of the coal feeding pipe 3 to wash away the coal adhering to the inner wall, but the water film tends to be divided into left and right at the lower part of the part where the coal adheres. While flowing down the inner wall of the high-temperature coal feeding pipe, it evaporated, and it was difficult to obtain a uniform water film.

[Problems to be solved by the device]

In the above-mentioned conventional technology, a thin water film is formed on the inner wall of the coal feeding pipe to prevent coal from adhering, but local coal adhering is unavoidable, and the water film is left and right on the downstream side. There is a part where the water film disappears. Further, since the inside of the mill has a high temperature of about 80 ° C., the coal feeding pipe itself also has a high temperature and evaporates the water in the water film. Therefore, the water film becomes thin particularly in the lowermost part of the coal feeding pipe. The water film is thin and easy to evaporate in an intermediate region between the water injection port and the water injection port where the water film forming water is injected. Further, all of the lower portion of the coal feeding pipe evaporates, and the water film is not smoothly formed on the entire circumference of the coal feeding pipe. As a result, in reality, a band-shaped water film was formed at each water injection port, and partial coal adhesion was unavoidable, leading to a total coal clogging.

An object of the present invention is to provide a coal clogging prevention device for a mill coal feeding pipe, which removes coal adhering to the coal feeding pipe even if a water film is formed, and reliably prevents coal clogging.

[Means for Solving the Problems]

The above-mentioned object is achieved by dropping water droplets inside the coal feeding pipe in addition to the water film.

That is, in order to achieve the above object, the present invention is a mill provided with means for supplying water drops that fall inside the coal feeding pipe without contacting the water film and collide with coal adhering to the inner wall of the coal feeding pipe. It proposes a coal clogging prevention device for a coal feeding pipe.

It goes without saying that the water film forming means and the water drop supplying means may be installed not only at the top of the coal feeding pipe but also at the top and the middle.

[Action]

The water droplets supplied to the inside of the coal feeding pipe drop without coming into contact with the water film on the inner wall of the coal feeding pipe, and therefore collide with the coal adhering to the inner wall where the water film is interrupted and drop it. Therefore, partial coal adhesion does not lead to total coal clogging.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing an example of a mill in which the conventional water film forming means and the water droplet supply means of the present invention are installed on the top of a coal feeding pipe, and FIG. 2 is a view showing details of a water injection device.

In these figures, the mill body 1 includes a crushing ball 2 and a coal feeding pipe 3, and the coal supplied from the upper part of the coal feeding pipe 3 is crushed by the crushing ball 2 and discharged as pulverized coal to the outside.
In this example, the water film water injection device 4 and the water drop water injection device 5 are installed above the coal feeding pipe 3. Each water injection device has a water chamber 6, a water injection port 7, a water injection pipe 8 and a water injection adjusting valve 9, and a spacer 10 is attached to the water injection device 5 for water drops so as to project from the inner wall of the coal feeding pipe 3. . The lower end of the spacer 10 has an edge shape so as to separate water droplets from the water film. The water poured into the water film pouring device 4 forms a water film to give water to the coal adhering to the inner wall of the coal feeding pipe 3 so that the coal can flow easily and also to wash off the adhering coal.

The adhered coal that cannot be removed by this water film is pushed out inside the coal feeding pipe 3 that has gradually grown. Therefore, the water injected from the water droplet injection device 5 falls inside the water film without joining the water film, and directly collides with the adhered coal that has flown out to the inside to give a shock to destroy the adhered matter. At the same time, moisture is supplied to the adhered substance so that the adhered substance can flow easily and is removed. In this example, for convenience of illustration, the water film inlet and the water droplet inlet are drawn side by side on the same cross section, but it is preferable to arrange them in a staggered manner on the circumference of the coal feeding pipe 3. Of course.

Another embodiment of the present invention is shown in FIG. In this example, coal feeding pipe 3
The water film water injection device 4 and the water drop water injection device 5 are also provided in the middle part of the above to strengthen the coal clogging prevention device. The respective operations are the same as those of the embodiment shown in FIGS. 1 and 2, and the description thereof will be omitted.

In this embodiment, since the water film injection device 4 and the water drop injection device 5 are also installed in the middle part of the coal feeding pipe, the function of preventing coal adhesion and coal clogging especially in the lower portion of the coal feeding pipe is improved. .

[Effect of device]

According to the present invention, means for removing coal that has adhered to the coal feeding pipe and cannot be removed by water drops even by the water film forming means is provided, and coal clogging of the mill coal feeding pipe can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a mill in which the conventional water film forming means and the water droplet supplying means of the present invention are installed at the top of a coal feeding pipe, FIG. 2 is a diagram showing details of a water injection device, and FIG. FIG. 4 is a diagram showing an embodiment in which a water film forming means and a water droplet supplying means are provided side by side on the top and middle portions of a coal pipe, and FIG. 4 is a diagram showing an example of a schematic configuration of a mill equipped with a conventional coal clogging prevention device. . DESCRIPTION OF SYMBOLS 1 ... Mill main body, 2 ... Grinding ball, 3 ... Coal supply pipe, 4 ... Water film water injection device, 5 ... Water drop water injection device, 6 ... Water chamber, 7
… Water injection port, 8… Water injection pipe, 9… Water injection control valve, 10… Water drop spacer.

Claims (2)

[Scope of utility model registration request] 1. A coal clogging prevention device for a mill coal feeding pipe, comprising means for forming a water film on an inner wall of a coal feeding pipe to a mill for pulverizing coal to prevent coal clogging, wherein the device is in contact with the water film. A device for preventing coal clogging of a mill coal feeding pipe, characterized in that it is provided with a means for supplying water drops that fall inside the coal feeding pipe and collide with the coal on the inner wall. 2. The coal clogging preventing device for a mill coal feeding pipe according to claim 1, wherein the water film forming means and the water droplet supplying means are installed at a top portion and an intermediate portion of the mill feeding coal pipe. A device to prevent coal clogging of mill feed pipes.