JP3757480B2 - Steel ball tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel ball tank. More specifically, the present invention relates to a steel ball tank that can eliminate clogging of steel balls.
[0002]
[Prior art]
In a boiler or the like, a heat exchanger is generally provided in the middle of an exhaust gas duct.
[0003]
Since the dust contained in the exhaust gas adheres to the heat transfer surface due to use of the heat exchanger and the heat exchange performance decreases, it is necessary to periodically remove the dust.
[0004]
Conventionally, steel balls have been used to remove the dust.
[0005]
Briefly described above, as shown in FIG. 3, a heat exchanger body 3 is provided in the middle of an exhaust gas duct 2 for passing an exhaust gas 1 of a boiler (not shown), and heat exchange is performed inside the heat exchanger body 3. When an electric heating tube group 4 (electric heating surface) is disposed, a steel ball inlet 6 having a steel ball distribution mechanism 5 is provided at the upper part of the heat exchanger main body 3, and the electric heating tube group of the heat exchanger main body 3 is provided. 4 is provided with a partition wall 7 for steel balls, a steel ball outlet 8 is provided at the lower part of the heat exchanger body 3, and a steel ball circulation device 9 is used between the steel ball outlet 8 and the steel ball inlet 6. A steel ball inlet / outlet passage 12 having a steel ball tank 11 capable of accommodating the steel ball 10 in the middle of the steel ball circulation device 9 is connected in parallel with the heat exchanger body 3.
[0006]
As shown in FIG. 4, the steel ball tank 11 has a steel ball inlet 13 at the upper peripheral position, and has a hopper portion 14 and a steel ball outlet 15 following the hopper portion 14 at the lower axial center position. A tank body 16, a steel ball discharge pipe 17 that can be moved up and down with the lower end inserted into the steel ball outlet 15 at the axial center of the tank body 16, and the support member 18 for the steel ball discharge pipe 17. And an elevating device 19 such as an elevating cylinder that is moved up and down.
[0007]
In addition, 20 is a valve provided on the entry side of the steel ball entrance / exit passage 12, and 21 is a support member that supports the tank body 16.
[0008]
Then, the lifting device 19 such as a lifting cylinder is extended to lower the upper end opening of the steel ball discharge pipe 17 to a position lower than the upper surface of the steel ball 10 accommodated inside the tank body 16 via the support member 18. As a result, the steel ball 10 inside the tank body 16 flows into the upper end opening of the steel ball discharge pipe 17, and the steel ball 10 is transferred from the steel ball discharge pipe 17 to the steel ball circulation device 9 through the steel ball entrance / exit flow path 12. Let them be sent.
[0009]
Then, when the steel ball 10 is sent to the steel ball circulation device 9, the steel ball circulation device 9 is operated to send the steel ball 10 to the steel ball inlet 6 at the upper part of the heat exchanger body 3. Through the steel ball distribution mechanism 5, the steel balls 10 are dropped while being evenly distributed to each section of the partition wall 7 for the steel balls, and the dust adhering to the electric heating tube group 4 is scraped off by the steel balls 10. I will let you.
[0010]
Since the steel ball 10 scraped off the dust is collected at the steel ball outlet 8 at the lower part of the heat exchanger body 3, by circulating it to the steel ball inlet 6 at the upper part of the heat exchanger body 3 by the steel ball circulation device 9, The dust adhering to the electric heating tube group 4 is scraped off repeatedly.
[0011]
When the dust is sufficiently scraped off, the steel ball 10 is returned to the steel ball tank 11.
[0012]
At this time, the lifting device 19 such as a lifting cylinder is contracted and the upper end opening of the steel ball discharge pipe 17 is positioned higher than the upper surface of the steel ball 10 accommodated inside the tank body 16 via the support member 18. Thus, the steel ball 10 is prevented from being discharged from the inside of the tank main body 16.
[0013]
[Problems to be solved by the invention]
However, the conventional steel ball tank has the following problems.
[0014]
That is, as described above, the steel ball discharge pipe 17 is raised and lowered to discharge the steel ball 10 from the upper end opening of the steel ball discharge pipe 17, but as the capacity of the steel ball tank 11 increases, 10 is likely to be clogged, and even if a steel ball tank 11 having a diameter of 1.5 m or more is made, it is difficult to operate well.
[0015]
This is because, as the capacity of the steel ball tank 11 increases, the diameter of the steel ball discharge pipe 17 increases, and the amount of the steel ball 10 that can flow into the steel ball discharge pipe 17 increases, but exceeds the required cutout amount. It is considered that the steel balls 10 try to flow into the steel ball discharge pipe 17 at a time and stick to each other due to dust or the like to which the steel balls 10 adhere to form a bridge.
[0016]
In view of the above circumstances, an object of the present invention is to provide a steel ball tank that can eliminate clogging of steel balls.
[0017]
[Means for Solving the Problems]
In the present invention, a steel ball inlet 23 is provided on the upper side of a cylindrical tank body 22 whose axis extends substantially in the horizontal direction, and a steel ball outlet 24 is provided on the lower side of the tank body 22. A rotating drum 25 having a substantially semi-cylindrical shape and extending in the axial direction from both axial center positions and projecting through the tank body 22 is rotatably disposed, and at least one of the rotating shafts 26 is rotatably disposed. At the position corresponding to the steel ball outlet 24 on the peripheral surface of the rotary drum 25 with the opening edge 28 facing upward, the rotary drive device 27 is directed downward in the circumferential direction from the opening edge 28 of the rotary drum 25. The steel ball tank is characterized in that a steel ball outlet slit 29 extending to a length that does not reach the lowest part and having a width substantially the same as the diameter of the steel ball outlet 24 is formed.
[0018]
According to the above means, the following operation can be obtained.
[0019]
When the steel ball 31 accommodated in the rotary drum 25 is taken out, the rotary drive device 27 is driven, the rotary drum 25 is tilted at a required angle around the rotary shaft 26, and formed on the lower side of the tank body 22. A steel ball outlet slit 29 formed on the peripheral surface of the rotary drum 25 is aligned with the steel ball outlet 24.
[0020]
Then, all the steel balls 31 accommodated in the rotating drum 25 are tilted together with the rotating drum 25, so that the steel balls 31 exceeding the angle of repose can be reliably transferred from the steel ball outlet slit 29 to the steel ball outlet 24. It will fall to the outside through.
[0021]
Then, by continuously increasing the inclination of the rotating drum 25 by the rotation drive device 27, the steel balls 31 exceeding the angle of repose are successively dropped to the outside, and finally clogging occurs. However, all the steel balls 31 are cut out.
[0022]
As described above, according to the present invention, the steel balls 31 are cut out by changing the inclination of the rotary drum 25, so that even if the steel balls 31 are enlarged, all the steel balls 31 can be cut without trouble without causing clogging. Can be put out.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
1 and 2 show an example of an embodiment of the present invention.
[0025]
A substantially cylindrical tank main body 22 whose axis extends in a substantially horizontal direction is provided, and a steel ball inlet 23 is provided on the upper side of the tank main body 22, and a steel ball outlet 24 is provided on the lower side of the tank main body 22.
[0026]
An approximately semi-cylindrical rotary drum 25 having the same axis as the tank main body 22 is disposed inside the tank main body 22 so as to be rotatable about the axis, and from both axial positions of the rotary drum 25 in the axial direction. A rotating shaft 26 extending and penetrating the tank body 22 is projected, and a rotary drive device 27 such as a motor is attached to at least one of the rotating shafts 26.
[0027]
Furthermore, it does not reach the lowermost part from the opening edge 28 of the rotating drum 25 downward in the circumferential direction to a position corresponding to the steel ball outlet 24 on the peripheral surface of the rotating drum 25 with the opening edge 28 facing upward. A steel ball outlet slit 29 is formed that extends to a certain length and has a width that is substantially the same as the diameter of the steel ball outlet 24.
[0028]
In addition, 30 is a support member that interferes with the rotating shaft 26, and 31 is a steel ball accommodated in the rotating drum 25.
[0029]
When the diameter of the steel ball 31 is 3 mm or the like, the gap between the tank body 22 and the rotary drum 25 is smaller than the diameter of the steel ball 31 in order to eliminate the biting of the steel ball 31, for example 1.5 ˜2 mm.
[0030]
Next, the operation will be described.
[0031]
The process of scraping off the dust adhering to the heat transfer surface of the heat exchanger using a steel ball is the same as in the case of FIG.
[0032]
In the present invention, when the steel ball 31 accommodated in the rotating drum 25 is taken out, the rotary driving device 27 such as a motor is driven, the rotating drum 25 is tilted at a required angle around the rotating shaft 26, and the tank body 22 is A steel ball outlet slit 29 formed on the peripheral surface of the rotary drum 25 is aligned with the steel ball outlet 24 formed on the lower side.
[0033]
Then, all the steel balls 31 accommodated in the rotating drum 25 are tilted together with the rotating drum 25, so that the steel balls 31 exceeding the angle of repose can be reliably transferred from the steel ball outlet slit 29 to the steel ball outlet 24. It will fall to the outside through.
[0034]
Then, by continuously increasing the inclination of the rotating drum 25 by the rotation drive device 27, the steel balls 31 exceeding the angle of repose are successively dropped to the outside, and finally clogging occurs. However, all the steel balls 31 are cut out.
[0035]
As described above, according to the present invention, the steel balls 31 are cut out by changing the inclination of the rotary drum 25, so that even if the steel balls 31 are enlarged, all the steel balls 31 can be cut without trouble without causing clogging. Can be put out.
[0036]
It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
[0037]
【The invention's effect】
As described above, according to the steel ball tank of the present invention, an excellent effect that the clogging of the steel balls can be eliminated can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic front view of an example of an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
FIG. 3 is a schematic system diagram of a conventional example.
4 is a partially enlarged view of FIG. 3;
[Explanation of symbols]
22 Tank body 23 Steel ball inlet 24 Steel ball outlet 25 Rotating drum 26 Rotating shaft 27 Rotating drive device 28 Opening edge 29 Steel ball outlet slit 30 Support member 31 Steel ball

Claims (1)

A steel ball inlet (23) is provided on the upper side of a cylindrical tank body (22) whose axis extends substantially horizontally, and a steel ball outlet (24) is provided on the lower side of the tank body (22). A rotating drum (25) having a substantially semi-cylindrical shape inside (22) and extending from an axial position at both ends in the axial direction and projecting through a rotating shaft (26) penetrating the tank body (22) is rotatable. The steel ball outlet (at the peripheral surface of the rotary drum (25) with the opening edge (28) facing upward is attached to at least one of the rotary shafts (26). 24) extends to a position corresponding to 24) from the opening edge (28) of the rotating drum (25) to the lower side in the circumferential direction and reaches the lowest part, and the diameter of the steel ball outlet (24) Steel ball tank characterized by forming a steel ball outlet slit (29) having substantially the same width as

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