JPH01252360A - Long petractable type shot cleaning device - Google Patents

Abstract

PURPOSE:To scatter the shot together with the air flow evenly on the upper side of a heat transfer tube group along the whole scope of the outer insertion tube stroke by inserting an outer tube outside a fixed inner insertion tube, providing a shot scattering head at the tip, and making to move it forward and backward by a driving device. CONSTITUTION:By the rotation of a pinion gear 26, a driving device 24 moves a rack 28 together with an outer insertion tube 22, and the advance stroke S1 to the front side and to the rear side is made equal to the stroke S2 of the cleaning direction on the upper side of a heat transfer pipe group 15. At the tip of the outer insertion tube 22, a conveying release plate 6, a scattering head 14 held by a hanger 13, and an air output tube 12 are provided, and the outer insertion tube 22 is guided on a guide rail 31 held by a hanging plate 30. A shot delivered in an inner insertion tube 18 strikes the conveying release plate 6, drops to strike the scattering head 14, it is repelled therefrom and scattered at the upper side of the heat transfer pipe group 15, and dispersed evenly over about a rectangle with one side of the shot dispersion width in the right angle direction to the stroke S2, and the other side of the stroke S2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention aims to remove dust adhering to a group of heat exchanger tubes of a heat exchanger and a boiler by colliding a shot with the heat exchanger tubes and using the impact force. The present invention relates to a shot cleaning device for removing the dust, which evenly spreads shot over a wide area on the upper surface of a group of heat transfer tubes.

[Conventional technology 1 FIG. 3 shows a conventional shot cleaning device.

The shots stored in shot storage tank 1 are:
When the shutoff valve 2 is opened, the air falls into the ejector 3, is attracted by the high-speed air flow blown by the blower 4, moves up the conveyance pipe as shown by the arrow 5, and collides with the conveyance release plate 6.

The seat that collided with the conveyance release plate 6 and lost its conveyance speed descends. 7, while the air conveyed by the shot rises as shown by arrow 8 and is discharged into the housing 9 of the heat exchanger.

Under normal operating conditions, a portion of the shot that has fallen into the upper hopper 11 installed at the upper part of the distribution box 10 flows into the mortar, centering on the inlet of the distribution pipe 12 connected to the lower part of the distribution box 10. The remaining part of the shot rolls down the deposition slope into each distribution pipe 12 and is deposited in the housing 9! It collides with the hemispherical dispersion head 14 supported by the Han ff-13, which is rotated, is repelled, and is almost evenly dispersed on the L surface of the heat exchanger tubes 15°15' group, and the heat exchanger tubes 15
．． It collides with the heat transfer surface at 15'.

Cyranoid that has fallen between the heat transfer surfaces while removing dust attached to the heat transfer surfaces is collected at the bottom of the hopper by the lower hopper 161 and returned to the storage tank 1 again.

The shot repeats the above-mentioned circulation intermittently or continuously as necessary.

Problem 1 to be solved by the invention E: When distributing shot evenly over a group of heat transfer tubes with a vast heat transfer area such as a large heat exchanger or large boiler, the conventional distribution box method The number of normal suribachi shapes that can be created is actually 4 at most.
- Since it is a limit, a second distribution box is installed at the bottom of the distribution pipe in a limited failure row, and a third distribution box is further installed at the bottom of the distribution pipe connected to the second distribution box. In this way, it is necessary to increase the number of shots distributed by installing so-called rat-like multi-branch piping by laminating each stage, and accordingly, it is necessary to equip each dispersion type at the end of each distribution piping. Not only that, but the entire distribution mechanism becomes extremely complicated, including a very large number of dispersions, and the cost of equipment for the refreening apparatus becomes high.

In this case, since the tion 1 is accumulated once in the distribution box, if the heat exchange fluid has moisture or corrosivity, 1, i
If the guest flying with the fluid is sticky, 11
[The accumulated shot forms a lump and sticks, causing various problems such as clogging at the inlet of the distribution pipe and uneven distribution of shot to each distribution pipe.

The present invention was made in order to solve these problems, and its purpose is to solve the conventional A movable shot that can evenly spread shot over a wider area in the direction of heat transfer tubes than the area sprayed by one dispersion type in the mold, and does not cause clogging. An object of the present invention is to provide a cleaning device.

[Means and effects for solving the problem 1] Equipped with an internal and external intubation tube configured in a long slide type, the internal intubation tube is fixed and a shot conveying tube is connected to its inlet side, On the exit side of the inserted bone, an external tube is inserted into the internal tube and is moved linearly backward on the upper surface of the heat exchanger tube group by a drive device. The distal end of the external intubation tube is equipped with a shot conveyance release plate and a single sitat dispersion head that evenly distributes the shot at the bottom, and the external intubation tube is moved straight or backward at low speed by a drive device while the shot conveyance tube ascends the internal intubation tube. Supplying the shot with airflow into the external cannula through the sill 7
F falls from the tip of the external tube and is evenly distributed over the upper surface of the heat exchanger tube group over the entire stroke range of the external tube during constant dispersion (after approximately 2 m) by the Shitat dispersion head.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a shot cleaning device according to an embodiment of the present invention.

The cleaning device of this embodiment has an inner tube connected to a conveying pipe 17 that conveys shots with a high-speed air flow. 18
The outer tube 22 is driven in the axial direction at low speed by the drive device 24, the conveyance release plate 6 absorbs the speed of the shot conveyed to the terminal end of the outer tube 22, and the cyanode whose speed has been released is VC at the bottom of the downcomer pipe 7 that freely falls to the bottom.
It is composed of a shot dispersing head 14 attached to a provided handle 13, and a protrusion pipe 21 for discharging the high-speed air flow used for conveying the shot.

The outer tube 22 that passes through the housing 1 which surrounds the heat transfer surface of the heat exchanger and the boiler via the ground backing 1rIi23 is connected to a drive device r! that linearly moves the outer tube 22 back and forth on the outside of the housing 9. 124 and a ground backing device 25 that prevents air from leaking from the opening with the internal tube 18.

Drive HR! 124 is a motor 27 that rotates the pinion gear 26 and a deceleration gear (not shown)! The rank 28 is fixed to a rack mounting base 29. According to the rotation of the pinion gear 26, the drive VC station 24 moves back and forth along the rack 28 together with the external tube 22. iη backward stroke S of the external intubation tube 22
1 is the same length as the stroke S2 in the cleaning direction of the upper surface of the heat transfer w15 group. .

On the other hand, inside the hounong 9, a conveyance release plate 6 for closing the distal end of the external intubation tube 22 is installed, and a dispersion head 14 having a hemispherical repulsive surface supported by a hanger 13 on the lower surface of the distal end.
is installed, and the air that conveys the shot to the tip is discharged! 21 and a target plate 30.
A guiding device having an idler roller 32 is provided.

The shot conveyed into the inner tube 18 collides with the conveyance release plate 6 of the outer tube 22, absorbs the conveyance speed and falls, collides with the dividing head 14, is repelled, and is scattered on the upper surface of the heat transfer W15 group. be done.

Since the external intubation tube 22 is reciprocating with a stroke S2 while distributing shots from the splitting head 14, one side is defined as the dispersion of shots perpendicular to the stroke S2, and the length of the stroke S2 is defined as the other side. Shots can be evenly distributed from one dispersing head 14 over a rectangular area.

FIG. 2 shows a shot cleaning device according to another embodiment of the present invention.

The shot cleaning device of this embodiment has a function of controlling the amount of shot/shot and the cleaning time at the required time after the shot is transported from the conveying pipe 17 and stored in the -B1 storage tank 33. This is an additional shot cleaning device. Transport ¥! The shot conveyed from 17 collides with the conveyance release plate 6, passes through the downcomer pipe 7, and is stored in the storage tank 33, and the air that conveyed the shot passes through the exhaust W21 and enters the heat exchanger or boiler's how song 9. It is discharged inside. A shutoff valve 3 is provided at the bottom of the storage tank 33.
4, an ejector 19, and a blower 20, which are connected to the internal intubation tube 18. The upper ejector 19 shot is sucked by the air flow of 2() to the blower and inserted W18.
After that, the same process as in the embodiment shown in FIG. By providing this, independent operation is possible, and the structure allows the shot amount and operating time to be selected depending on the contamination status of the heat transfer surface.

[Effect of the invention 1] The dispersing head moving type shot cleaning device of the present invention allows the stroke of the dispersing head to be 10 strokes or more.
Compared to the area to be sprayed by each dispersing head of 3 to 4, the dispersion area on the upper surface of the heat exchanger tube shared by one dispersing head of the present invention is horizontal (spread width approximately 21 + 1) x vertical (stroke 10m
)=approximately 20×2, the shot can be evenly distributed over a vast rectangular area.

Therefore, by installing multiple cleaning devices in parallel, it is possible to easily and relatively easily distribute shots evenly to every corner of the upper surface of the heat transfer tube group of large heat exchangers and large boilers that have vast heat transfer surfaces. It became possible to distribute the

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a shot cleaning device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a shot cleaning device according to an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional shot cleaning device. It is a schematic explanatory diagram. DESCRIPTION OF SYMBOLS 1...Storage tank, 2...Shutoff valve, 3...Ejector-14...Blower, 5...Arrow, 6...Transfer release plate, 7...Downcomer pipe, 8...・Arrow, 9... How song, 10... Distribution box, 11... Upper hopper, 12
...Distribution pipe, 13...Hanbu, 14...Dispersion head, 15.15'...Heat transfer tube, 16...Lower hopper,
17...Transport pipe, 18...Inner intubation tube, 19...Ejector-120...Blower, 21...Exhaust pipe, 22...
... External intubation tube, 23 ... Ground backing device, 24
... drive device, 25... ground backing device,
26... Pinion gear, 27... Motor, 28...
...Rack, 29...Rack mounting base, 30...Target board, 31...Idrail, 32...Idroller,
33...Storage tank, 34...1 grass 1 stop valve. Patent applicant is Delice Co., Ltd.

Claims (1)

[Claims] A fixed inner tube that receives shot carried by an air flow, an outer tube that is inserted into the inner tube and reciprocated by a drive device, and a shot dispersion head installed at the tip of the outer tube. A long-slip type shot cleaning device comprising: