JPS6036526B2 - Tube cleaning equipment for boilers, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jet cleaning device for cleaning and removing scale adhering to the outer surface of tubes in a boiler or other heat exchanger using a jet fluid.

In general, in heat exchange equipment such as a boiler, scale tends to adhere to the outer surface of the tube during operation, and in particular, a large amount of scale adheres to the outer surface of the tube on the boiler furnace side.

As a result, not only is the thermal efficiency lowered, resulting in a decrease in output, but also the adhesion of this scale causes corrosion of the tube matrix, so pre-cleaning is carried out periodically. Conventionally, a nozzle is provided in a shell as a high-pressure fluid source for cleaning to remove scale attached to the outer surface of the tube, and the fluid sprayed from the nozzle while moving close to the outer surface of the tube is used to remove scale attached to the outer surface of the tube. Devices for removing kimono are disclosed in, for example, Japanese Patent Publication No. 37-5853 and Japanese Patent Publication No. 41-183.
As is known from Publication No. 64, these conventional devices are installed in boilers, etc., and cannot be completely removed even when operated at appropriate times to remove soot and foreign matter adhering to evaporation tubes, etc. It may not be possible.

As a result, as the amount of deposits that cannot be removed gradually increases over time, during regular inspections when the boiler is shut down, a person enters the furnace and sprays high-pressure water with a manual spray gun.
It is removed by jet cleaning (100 to 150k9f/) or cleaning. This manual removal method has problems with workability and safety, such as the need for scaffolding inside the reactor. In other words, with the recent increase in the size of boilers, it is necessary to install scaffolding inside the furnace, which is time-consuming and labor-intensive, and cleaning is carried out by workers with spray guns, which limits the pressure at which they can be used. There were also inconveniences in that safety and workability were reduced, and the cleaning effect could not be improved to a great extent.

The present invention aims to accurately eliminate the drawbacks of these conventional methods, and is portable and can be installed and moved to any location, and the outer surface of the boiler tube can be sprayed without the need for a person to enter the furnace with a spray gun. , solves the problems of safety, workability, and cleaning effectiveness seen in other cleaning methods, automatically and easily removes and cleans the outer surface of the boiler tube with high-pressure water, and eliminates wasted cleaning water. The object of the present invention is to provide an effective tube cleaning device that is economical, efficient, and easy to handle by eliminating the problem of tube cleaning.

The present invention provides an apparatus for cleaning and removing scale adhering to the outer surface of a boiler tube or other tube of a heat exchanger with a jet of fluid, in which a nozzle is installed via a nozzle holder at a symmetrical position with respect to a central axis that supports the nozzle,
Since the nozzle repeatedly moves in the circumferential direction with respect to the central axis,
A nozzle car with a drive mechanism capable of forward and reverse rotation, and a running column that has a rack and allows the nozzle car to run via a pinion that meshes with the rack are installed in a shell so as to be able to move up and down, and the nozzle car is moved up and down. It is equipped with a mechanism that converts the rotary motion of the output shaft into repetitive motion by moving the nozzles sequentially within the shell, and continuously pumps high-pressure water while repeatedly moving a pair of nozzles in the circumferential direction around the central axis via a joint. - The present invention is characterized in that it is equipped with a mechanism for spraying and cleaning the outer surface of the tube, so that scale removal from the outer surface of the tube can be carried out safely and efficiently. An embodiment in which the present invention is applied to a boiler will be described with reference to the drawings.
A running column 5 on which a nozzle car 4 runs is suspended between the rows so as to be able to rise and fall freely.

A rack 6 and a guide 7 are attached to this traveling column 6 so that the nozzle car 4 can be moved, and both ends are provided with flanges 5.
The total length of the running column 5 can be adjusted from the size 1 inside the boiler furnace 1 at ' and 5', and a hoisting device (Fig. (not shown), and go up and down in a manner that does not interfere with the running of the nozzle car 4. Next, the nozzle wheel 4 is attached to this traveling column 5. This nozzle wheel 4 includes a high-pressure hose 9 that guides high-pressure water, a high-pressure hose fitting 10 attached to the free end of this hose 9, a snowbell joint 12 rotatable around the axis of the high-pressure hose fitting 10, and a snowbell joint 12 to which it is attached. It consists of a rotatable nozzle holder 14 and a nozzle 15 supported by a bearing 13, an air motor 16 as a driving source, reduction gears 17, 18 as a rotation transmission mechanism, chains 19, 20, sprockets 21, 22, 23, 24, A transmission mechanism consisting of a ball joint 25, a pinion 26, and a lever 27 is equipped, and the pinion 26 passes the rack 6 on the running column 5 to the nozzle wheel 4.
The lever 27 enables the movement of the reducer 17,
Converts the rotational motion of the output shaft into repetitive motion and moves the nozzle holder 1
4 to enable repeated movement of the nozzle 15. Further, the forward and reverse rotation of the air motor 16 is controlled by air control valves (limit valves 28, 29, shuttle valves 30, 31, relay valve 32), and limit valve operating bars 33 attached to both upper ends of the traveling column 5. , 34 enables the nozzle wheel 4 to reciprocate on the running column. Further, by rotating the air motor 16 in forward and reverse directions using the remote control valves 35 and 36, the reciprocating motion of the nozzle wheel 4 can be automatically controlled remotely. The nozzle car 4 is mounted on a running column 5 disposed inside the boiler furnace 1, and a high pressure hose 9 is connected to a high pressure pump 37.
In the figure, 39' is a traveling guide, and 40' is a control panel.

Note that the hanging position of the traveling column 5 can be changed by manually or automatically adjusting the length of the wire 8, but instead of the winding mechanism, a crane mechanism, a lifting village, or a screw shaft screwed thereto may be used. It can also be connected so that it can be raised and lowered using a moving element.

Then, the air motor 16 installed in the nozzle car 4 is rotated, and its rotation is connected to the sprocket 21, chain 19, sprocket 22, reducer 18, sprocket 23, chain 20, and sprocket 24, and the pinion 26 is rotated, thereby causing the nozzle to rotate. A car 4 is moved on a running column 5.

At the same time, the rotation of the motor 16 converts the rotational movement of the output shaft of the speed reducer 17 into a repetitive movement of the nozzle holder by means of a lever 27, causing the nozzle 15 to move repeatedly. At the same time, the high pressure pump 37 is operated, and the high pressure hose 9, high pressure hose connection 10, snowbell joint 12, and nozzle holder 14 are operated.
High pressure water is continuously supplied from the nozzle 15 through the tubes 2 and 3.
The nozzle wheel 4, the left and right tubes 2
, three rows (or top and bottom) are cleaned. When cleaning of the nozzle car 4 at the same height for one or more steps on the traveling column 5 is completed, the traveling column 5 is moved up and down (or left and right) to sequentially perform cleaning. In addition, the upper and lower tube rows 38
This can be done by rotating the rotatable nozzle holder 14 of the nozzle wheel 4 and changing to another nozzle holder 39. Further, by adjusting the length of the lever 27 of the nozzle wheel, the repetition angle of the nozzle 15 can also be adjusted. The results of cleaning according to the present invention at a certain power plant were as follows.

・Object to be cleaned: High temperature secondary superheater pipe ・Cleaning time: 1 concentration and 3 powders ・Cleaning pressure: 200 to 300 k9f/・Water usage: Approximately 300℃ Note: MST is main steam temperature, RST is reheater temperature As described above, the tube cleaning device of the present invention efficiently cleans and removes scale adhering to the outer surface of the tube. A nozzle is attached, and since the nozzle moves repeatedly in the circumferential direction with respect to the central axis, there is a nozzle wheel with a drive mechanism that can rotate forward and backward, a rack that connects this nozzle wheel, and a pinion that meshes with this rack. A pair of nozzles are moved through a joint, and the nozzle wheel is sequentially moved within the shell, and a mechanism is provided to convert the rotational motion of the output shaft into repetitive motion. Equipped with a mechanism that continuously sprays and cleans the outer surface of the tube with high-pressure water while making repeated movements in the circumferential direction around the central axis, it can be cleaned remotely from outside the boiler furnace without the need for people to enter the boiler furnace with a spray gun. The purpose can be achieved automatically, easily and safely, and since it can be installed and moved to any location, it can be easily applied to complex structures that require the installation of multiple devices. There is no limit to the working pressure, and high-pressure water of 200 to 300k9f/ground is used as the cleaning medium. Even when cleaning at ultra-high pressure, there is no problem with the work, and a major improvement in production efficiency can be expected. It helps to protect the environment, reduces the consumption of washing water, allows for uniform work without waste, and has the advantage of being efficient and economical.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 and FIG. 2 are schematic views of the installation of the hawk inside the boiler furnace, FIG. 3 is a side view of the nozzle car, and FIG.
The figure is a system diagram of the control valve, and FIG. 5 is a side view of the nozzle holder for cleaning the upper and lower tube rows. In FIG. 4, among the piping connecting each valve, the solid line shows the nozzle vehicle, the broken line shows the remote control pipe, and the line inside the two-dot chain line shows the remote control box. Further, in FIG. 5, the arrow indicates the washable range. 1... Boiler furnace, 2, 3... Tube, 4...
Nozzle car, 5... Travel column, 6... Rack, 7... Guide, 10... Hanging wire, 9... High pressure hose , 10... High pressure hose connection, 11... Air hose, 12... Swivelge 3 inch, 13... Bearing, 14... Nozzle holder, 15.../Zuru, 16... Air motor ,17,
18...Reduction gear, 19,20...Chain, 21,
22, 23, 24... Sprocket, 25...
... shaft coupling, 26 ... pinion, 27 ... lever,
28, 29... Limit valve, 30, 31... Shuttle valve, 32... Relay valve, 33, 34... Limit valve operation bar, 35, 36... Remote control valve, 37...・High pressure pump, 38...
Upper and lower tube rows, 39... Nozzle holder, 40... Fair filter, 41... Needle valve, 42... Manhole. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A nozzle connected to a cleaning high-pressure fluid source for removing scale attached to the outer surface of the tube is provided in the shell, and the fluid is injected from the nozzle while moving close to the outer surface of the tube. In the device for removing the deposits with a fluid,
The nozzle is mounted via a nozzle holder at a symmetrical position with respect to the central axis that supports the nozzle, and the nozzle moves repeatedly in the circumferential direction with respect to the central axis, so it is a nozzle wheel with a drive mechanism that can rotate forward and backward. , this nozzle car is easy to use,
A running column is installed in the shell so as to be able to move up and down via a pinion that meshes with the rack, and a mechanism is provided to move the nozzle wheels sequentially within the shell and convert the rotational motion of the output shaft into repetitive motion. 1. A tube cleaning device for a boiler or the like, characterized by a mechanism for cleaning a tube by continuously spraying high-pressure water onto the outer surface of the tube while repeatedly moving a nozzle in a circumferential direction about a central axis through a joint. 2. The tube cleaning device according to claim 1, wherein the elevating mechanism for the traveling column comprises a traction member connected to a hoisting device. 3. Claim 1, wherein the nozzle car is configured to perform reciprocating motion of the nozzle car by switching control valves using operating levers attached to both ends of the traveling column to rotate the driving device in forward and reverse directions. Or the tube cleaning device according to item 2. 4. The tube cleaning device according to claim 3, wherein the nozzle car is equipped with a mechanism that allows forward and reverse rotation of the air motor to be controlled by a remote control valve, thereby controlling its reciprocating motion.