JPH0443757Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is used for heat exchangers installed in boilers, etc., and removes dust such as soot adhering to the surface of heat transfer tubes inside the heat exchanger. This invention relates to a device for distributing steel balls into a heat exchanger.

PRIOR ART Dust such as soot and dust adheres to the surface of heat exchanger tubes of heat exchangers installed in boilers etc. due to long-term use, reducing heat exchange efficiency.
That dust needs to be removed. Therefore, conventional dust removal methods include a suit blowing method in which high-pressure air or steam is blown onto the surface of the heat transfer tube, and a method in which steel balls are sprayed on the surface of the heat transfer tube.

Problems that the invention aims to solve: However, the conventional suit blowing method as described above requires the installation of equipment to generate high-pressure air or steam, and the installation and operating costs are extremely high. In addition, there was a problem in that it took a long time to remove the dust. Further, in the method of dispersing steel balls, the steel balls are directly sprayed onto the heat transfer tube group, and since the steel balls are not uniformly dispersed, there is a problem that dust is not sufficiently removed.

Means to solve the problems In order to solve the above problems, in this plan,
A device that sprinkles steel balls inside a heat exchanger in order to remove dust attached to the surface of heat exchanger tubes,
A dispersion plate installed above a group of heat transfer elements of a heat exchanger, which has a spherical surface bulging upward and has an opening formed in its center, and a dispersion plate arranged above the dispersion plate at a predetermined distance. dust removal from a heat exchanger, comprising: a steel ball supplying member disposed at the base of the heat exchanger; the steel balls are dropped from the steel ball supplying member onto the dispersion plate, thereby dispersing the steel balls to the heat exchanger tube group; Provides steel ball dispersion equipment for industrial use.

Effect: According to the above method, the steel balls hit the spherical dispersion plate and scatter to the surrounding area, so the steel balls are evenly distributed to every corner of the heat exchanger and adhere to the surface of the heat exchanger tube group. It is possible to sufficiently remove the dust that exists.

Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing an embodiment of a steel ball dispersing device for dust removal according to the present invention. Reference numeral 1 denotes a circular dispersion plate having a spherical shape with a surface bulging upward, and a hole 2 is provided in the center of the dispersion plate. For example, four supports 3 are provided on the dispersion plate 1 so as to extend upward from around the hole 2. A collar member 4 is attached above the support 3. This collar member 4 is attached to a steel ball supply pipe 5 passing through its center. The steel ball supply pipe 5 is formed, for example, in a rectangular shape, with its lower end open, and its center located approximately directly above the hole 2 and at a predetermined distance from the surface of the dispersion plate 1. It is located in That is, the distribution plate 1 is suspended from the collar member 4 via the support 3.

The steel ball dispersing device for dust removal formed in this way is installed in the heat exchanger 6, as shown in FIG. That is, a large number of heat exchanger tubes 7 are arranged inside the heat exchanger 6 to form a tube group, and a fin is attached to the surface of each heat exchanger tube 7. A fluid to be heated, etc. is introduced into each heat transfer tube 7 from the fluid inlet 7a side, and is discharged to the outlet 7b side. On the other hand, high temperature combustion exhaust gas etc. are introduced from the gas inlet 6a side of the heat exchanger 6, and the gas outlet 6a
It is discharged to side a.

Therefore, the soot and dust in the combustion exhaust gas adhere to the surface of the heat exchanger tube 7 as dust, so in order to remove this, a steel ball scattering device shown in FIG. 1 is installed above the heat exchanger tube 7. Furthermore, as shown in Figure 2,
The steel ball supply pipe 5 extends to the outside of the heat exchanger 6,
There, it is connected to a steel ball quantitative supply device 8. As this steel ball quantitative supply device 8, for example, a rotary feeder is used.

Next, the action will be explained. When removing dust, steel balls are supplied from the steel ball quantitative supply device 8 to the steel ball supply pipe 5. And, as shown in Figure 3,
The steel balls 9 introduced into the supply pipe 5 naturally fall onto the dispersion plate 1 from the lower open end. The steel ball 9 that collides with this dispersion plate is repelled directly upward at the central axis point of the dispersion plate 1, but as it approaches the circumference, the angle of repulsion increases and the steel ball is scattered further away. At the same time, it scatters in a manner according to the slope of the surface of the dispersion plate 1 and falls onto the heat exchanger tube 7. The steel ball 9 that has reached the hole 2 at the center of the distribution plate 1 passes through the hole 2 and falls onto the heat exchanger tube 7 directly below the distribution plate 1.

By the way, when the steel ball supply pipe 5 is formed into a rectangular shape, the steel balls fall in a shape that matches the shape of the inside of the pipe, so as shown in FIG. A steel ball falls, collides with a spherical surface, and scatters in a roughly square shape. That is, the steel balls 9 that have fallen near the top of the inner surface of the supply pipe 5 are
It falls on the outer periphery of the wall and scatters the farthest distance.
This is because the surface of the dispersion plate 1 is formed into a spherical surface that bulges upward.

Therefore, as shown in FIG. 5, the shape of the steel ball supply pipe 5 is matched to the arrangement shape of the heat transfer tubes 7 of the heat exchanger 6,
In particular, by arranging the corners of the supply pipes 5 to match the corners of the heat exchanger 6, it becomes possible to scatter the steel balls 9 over the entire heat exchanger tube 7 and remove dust. In addition, for the heat exchanger 6 whose length is long compared to the width dimension of the heat exchanger tube group, it is recommended to install several steel ball dispersing devices of the present invention at intervals as shown in FIG. Effective.

Achievements of the invention As detailed above, according to the invention, among the steel balls that have fallen onto the dispersion plate, those near the center of the dispersion plate are allowed to fall onto the heat transfer tubes near the dispersion plate. By dropping the steel balls that have fallen on the outer periphery of the heat exchanger tube onto a distant heat exchanger tube, it is possible to remove dust from the surface of the heat exchanger tube almost evenly over a wide area. A steel ball dispersion device for removal is provided. In addition, the steel ball dispersion device of the present invention can disperse steel balls by appropriately setting the height of free fall of the steel balls onto the dispersion plate, the curvature of the spherical surface of the dispersion plate, the distance to the dispersion plate on the heat transfer tube, etc. It is also possible to appropriately adjust the scattering range of the ball.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the steel ball dispersion device for dust removal according to the present invention, and Fig. 2 is a partial view of the steel ball dispersion device shown in Fig. 1 installed in a heat exchanger. 3 and 4 are explanatory diagrams shown to explain the function of the present invention, and 5.
The figure is a plan view showing the state of FIG. 4 applied to a specific heat exchanger. 1... Dispersion plate, 2... Hole, 3... Support, 4
... Flange member, 5 ... Steel ball supply pipe, 6 ... Heat exchanger, 7 ... Heat exchanger tube, 8 ... Steel ball quantitative supply device, 9
……wrecking ball.

Claims (1)

[Scope of utility model registration request] A device that sprinkles steel balls inside a heat exchanger in order to remove dust attached to the surface of heat exchanger tubes,
A dispersion plate installed above a group of heat transfer tubes of a heat exchanger, which has a spherical surface bulging upward and has an opening formed in its center, and a dispersion plate installed above a group of heat transfer tubes at a predetermined distance above this dispersion plate. for removing dust from a heat exchanger, comprising: a steel ball supplying member disposed therein; the steel balls are dropped from the steel ball supplying member onto the dispersion plate, thereby dispersing the steel balls to the heat transfer tube group; Steel ball scattering device.