JPH0481677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic cleaning device for an open rack type vaporizer, which is a panel body in which heat transfer tubes are arranged side by side in a curtain shape.

[Conventional technology]

For example, in an open rack vaporizer for liquefied gas such as LNG, as shown in Figure 10, a large number of heat transfer tubes with fins are installed vertically in parallel between an upper header (tube) and a lower header (tube). A panel 1, which is a vaporizer, is formed.

The fins extend approximately parallel to the tube axis of the heat transfer tube, and a trough 2 is provided facing the width direction of the upper side of the panel 1. Water overflows from the trough 2 and flows onto the panel surface, discharging the liquefied gas. vaporize.

This flow of water down the panel surface is done to enhance the heat transfer effect of the vaporizer against ultra-low temperature liquids of minus 100 degrees.For example, seawater or fresh water that has been stored for a long time is used. case,
The panel surface becomes dirty with dirt, slime, microorganisms, etc. contained in the water, and requires periodic cleaning.

Conventionally, such stains on the surface of the panel 1 can be removed by stopping the operation of the vaporizer, installing a scaffold between the panels 1 and 1 arranged in parallel as shown in FIG. 11, and manually using a brush or a cleaning device using jet water. It was being removed.

[Problem that the invention seeks to solve]

However, with this manual cleaning method,
The operation of the vaporizer must be stopped for a long period of time (at least one week) for cleaning work, and since the work is done at heights, scaffolding is always required, and it is time-consuming to assemble and dismantle the scaffolding, and the use of scaffolding materials. There is also a risk that the surface of the panel 1 may be damaged due to collision.

Furthermore, the distance between panels 1 and 1 in parallel is 0.5m ~
Since the area is narrow, approximately 0.6 m in length, there is not enough work space, resulting in poor work efficiency and easy cleaning residue.
In addition, since cleaning is performed after the area has become sufficiently dirty, the heat exchange efficiency decreases until cleaning is performed, and the sewage film is also more likely to be disturbed by the dirt.

In addition, Japanese Patent Application Laid-open No. 58-47911 discloses a rotating wire brush that removes soot by rotating a wire brush placed between a group of tubes in a waste heat boiler and making it reciprocate in the tube axis direction. A soot removal device is shown.

Furthermore, in Japanese Patent Application Laid-Open No. 57-77898, as a cleaning device for the heat transfer surface of a heat exchanger, a cleaning plate that reciprocates inside the heat exchanger along the longitudinal direction of the heat transfer tube is provided, and the cleaning plate A plurality of holes are formed at positions corresponding to the arrangement of the heat exchanger tubes for passing the heat exchanger tubes through, and a reciprocating transmission means is provided on the cleaning plate for forcing the cleaning plate to reciprocate along the longitudinal direction. What is attached is shown.

These JP-A-58-47911 and JP-A-57-
All of the objects to be cleaned that are the object of Publication No. 77898 are smaller than the open rack vaporizer for liquefied gas such as LNG that is the object of the present invention.

Because of its small size, it is possible to clean multiple pipes at the same time with a large number of brushes corresponding to the number of pipes, but with an open rack type vaporizer, it is impossible to clean a large number of pipes at the same time due to its size. Unexamined Japanese Patent Publication 1983
The techniques of JP-A-47911 and JP-A-57-77898 cannot be applied.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an automatic cleaning device using a continuous rail of an open rack type vaporizer capable of cleaning even a large panel surface, which has conventionally been done manually by setting up a scaffold, by a series of automated operations without manual intervention.

[Means for solving problems]

In order to achieve the above object, the present invention forms a panel that is a vaporizer by vertically arranging a large number of heat transfer tubes with fins extending substantially parallel to the heat transfer tube axis between an upper header and a lower header. However, in an open rack type vaporizer that vaporizes liquefied gas by sprinkling water from a trough placed above the panels, a straight rail and a curved portion connecting the parallel vaporizer panels are provided between the panels. The main idea is that a meandering rail is constructed continuously, and a cleaning machine having a rotating brush that comes into contact with the panel surface is installed on this rail so that it can run freely.

[Effect]

According to the present invention, the cleaning machine moves along the rail while scrubbing the panel surface with the tip of the rotating brush and washing the panel surface using running water from the trough. In this way, once the two opposing sides of the parallel panels have been cleaned, the cleaning machine will slide further along the rails, go around the edge of the panel, enter between the next new panels, and start cleaning that side. Then, the same procedure is repeated, and all the panels are automatically cleaned.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of an automatic cleaning device using a continuous rail for an open rack type vaporizer according to the present invention, and FIG. 2 is a partially cutaway front view of the same. It is a rail that is constructed at a certain position and meanderes between the panels 1 that are arranged in parallel.
This rail 3 utilizes H-shaped steel, and as shown in FIGS. 4 and 5, a straight section 3a parallel to the surface of the panel 1
It consists of a continuous combination of a curved part 3b that goes around the end of the panel 1 and connects the straight part 3a. Further, corresponding to this rail 3, an auxiliary rail 4 which meanders in the same way is provided below.

A bogie 5 that runs using the rail 3 as a guide is attached, and a rectangular or cylindrical guide frame 6 is provided at the bottom of the bogie 5, and the wheels at the lower end of the guide frame 6 ride on the auxiliary rail 4 to move the rails 3, 4. A guide frame 6 that stands upright between them is spanned so as to be movable.

An air motor 7 for traveling is housed within the guide frame 6, and driving wheels 8 are connected to the motor 7.
In this embodiment, the wheel 8 is of a pinion type with teeth formed on the outer periphery, and on the other hand, a rack 9 is provided in the length direction of the rail 3 so that the tooth surface faces outward, especially at the curved portion 3b, and the wheel 8 is 8 was made to mesh with this rack 9.

A brush up/down air motor 15 is fixedly installed at the lower part of the truck 5, and the motor 15 is connected to a lifting head 10 which is attached to a guide frame 6 so as to be able to move up and down freely through a chain 11. In this embodiment, the chain 11 is a chain belt that is stretched between the motor 15 and the sprocket provided at the lower end of the guide frame 6, but instead of using one real chain or one real wire, it can be raised and lowered by winding and lowering. It may also be a device that allows the head 10 to be pulled up or down.

As shown in FIG. 3, the lifting head 10 includes:
A total of two air motors 12 and rotary brushes 13 rotated by the air motors 12 are provided on the left and right sides, and the brushes of the brushes 13 are provided in contact with one surface of the panel.

In the figure, reference numeral 14 indicates a reel for processing a hose that controls air supply to the air motor 12.

Next, to explain the usage and operation, seawater is flowed from the trough 2 to the vaporizer panel 1,
The surface of the panel 1 is covered with a film of flowing water.

The truck 5 is installed on the rail 3 so that it can run, and the guide frame 6 hanging from the truck 5 is connected to the panels 1 and 1.
The tip of the rotating nylon brush 13 on the lifting head 10, which is located parallel to the surface of the panel 1 in the center between them and is attached so as to hold the guide frame 6, is in contact with the surface of the panels 1, 1. There is.

In this state, if the air motor 12 is started and the rotary brush 13 is rotated, the brush tip will rub the surface of the panel, and cleaning will be performed using the flowing water.

On the other hand, if the air motor 15 is driven while rotating the rotary brush 13 in this manner, the elevating head 10 moves up and down along the guide frame 6 via the chain 11, and the rotary brush 13 moves up and down on the panel 1 surface.

When the air motor 7 is started at the same time, the wheels 8 are rotated, and the cleaning machines such as the trolley 5, the guide frame 6, and the rotating brush 13 are moved laterally on the panel 1 along the rail 3. FIG. 6 shows the trajectory of the rotating brush 13 with respect to one surface of the panel at this time.

In this way, once the space between one panel 1 and 1 has been cleaned, the trolley 5 and the cleaning machine move from the straight section 3a of the rail 3 to the curved section 3b, go around the end of the panel 1, and move to the next panel 1. , 1 and clean it in the same way from the opposite side. By repeating the above-mentioned operations, as the trolley 5 moves along the rail 3, cleaning is performed sequentially from the end of each space between the panels 1, which are arranged in parallel. In addition, the curved portion 3b of the rail 3 has a narrow space between the panels 1, 1, so it becomes a considerable hairpin curve.
This sharp curve can be accommodated by the meshing of the rack 9 and the wheels 8.

Further, as a second embodiment of the present invention, it is also possible to use one motor as both the air motor 7 for traveling and the air motor for raising and lowering the lifting head 10. FIG. 8 shows an example of this, in which the air motor 7 is housed in the lower part of the guide frame 6, and a support post (not shown) is installed near the guide frame 6 from the truck 5 and vertically parallel to it. Sprockets 18 and 19 were attached between the middle and lower ends of this support post, and a chain belt 20 was wound around these. Further, the lower sprocket 19 and the output shaft of the air motor 7 are connected to a rotating shaft 24 having a bevel gear 21 on the output shaft side, a bevel gear 22 meshing with the bevel gear 22 at one end and a spur gear 23 at the other end, and the spur gear 23. It is connected via a meshing sprocket 19 and a coaxial spur gear 25.

On the other hand, one end of a connecting rod 26 serving as a link is pivoted to the side of the lifting head 10, and the connecting rod 26
The other end was pivoted to a chain belt 20.

Further, a sprocket 27 is provided coaxially with the sprocket 18 provided in the middle of the support post, and this sprocket 27 is connected via a chain belt 28 to a sprocket 29 that rotates the axle of the driving wheel 8 on the truck 5 side.

If the air motor 7 is driven while rotating the rotary brush 13 in this way, the sprocket 19 will rotate via the transmission member bevel gear 21 → bevel gear 22 → rotating shaft 24 → spur gear 23 → spur gear 25 → and the transmission between the sprockets 18 and 19 will be The chain belt 20 also rotates. The movement of the chain belt 20 causes the lifting head 1 to move through the connecting rod 26.
0 is also pushed up along the guide frame 6, and when the connecting rod 26 is attached to the chain belt 20 beyond the upper sprocket 18,
This time, the head 10 descends according to the chain belt 20.

In this way, the rotating brush 13 moves up and down along the guide frame 6 while rotating itself, but the rotation of the sprocket 18 is caused by the rotation of the sprocket 27 → chain belt 28 → sprocket 29.
This is transmitted and the wheel 8 rotates. As a result, trolley 5
moves forward along the rail 3, and the rotating brush 13 moves vertically and laterally on the surface of the panel 1, drawing a trajectory similar to that shown in FIG.

In addition, in the first embodiment, the rotating brush 13
It is also conceivable to have a time difference between the driving air motor 12 of the truck 5 and the traveling air motor 7 of the truck 5, for example, to drive the traveling air motor 7 intermittently. In that case, the locus of the brush 13 with respect to one surface of the panel will be as shown in FIG.

In still another embodiment, as shown in FIG. 9, the rotating brush 13 is not moved up and down along the guide frame, but instead is shaped like a vertical endless belt that is close to the vertical width of one panel. , the brush tips may be brought into contact with one surface of the panel on both sides.

〔Effect of the invention〕

As described above, the automatic cleaning device using continuous rails for open rack type vaporizers of the present invention can automatically clean between many parallel panels, which has enough space for a person but has a small work space, without requiring any human intervention. The panel surface can be cleaned immediately, and in this case, cleaning can be performed while the vaporizer is in operation without having to stop the operation of the vaporizer. In addition, since no human hands are used, there is no need for scaffolding, etc.
It is safe, and since cleaning can be started at any time, it can be cleaned frequently without leaving it for a long period of time, and it does not accumulate dirt and is not prone to conditions where heat exchange efficiency is reduced or the sewage film is easily disturbed. It's something that can't happen.

Also, once you have finished cleaning between one panel,
Since the cleaning machine automatically moves between panels, the entire process can be performed in automatic continuous operation.

[Brief explanation of drawings]

Fig. 1 is a side view showing a first embodiment of an automatic cleaning device using a continuous rail for an open rack type vaporizer according to the present invention; Fig. 2 is a partially cutaway front view of the same;
The figure is a sectional view taken along the line A-A in Figure 2, Figure 4 is a plan view showing the arrangement relationship between the rail and panel, Figure 5 is a cross-sectional plan view of the rail, and Figures 6 and 7 are of the rotating brush. FIG. 8 is an explanatory diagram showing another embodiment; FIG. 9 is a front view showing another embodiment; FIG. 10 is a partial perspective view of an open rack carburetor; FIG. 11 is an explanatory diagram showing a conventional example. 1...Panel, 2...Trough, 3...Rail,
3a... straight part, 3b... curved part, 4... auxiliary rail, 5... bogie, 6... guide frame, 7...
...Air motor, 8...Driving wheel, 9...Rack, 10...Lifting head, 11...Chain, 1
2... Air motor, 13... Rotating brush, 14...
...Processing reel, 15...Air motor, 16...
Lifting head, 17... Air motor, 18, 19...
...Sprocket, 20...Chain belt, 2
1, 22... Bevel gear, 23, 25... Spur gear, 24... Rotating shaft, 26... Connection rod, 27,
29... Sprocket, 28... Chain belt.

Claims (1)

[Claims] 1. Between the upper header and the lower header, a large number of heat exchanger tubes with fins extending substantially parallel to the axis of the heat exchanger tubes are vertically arranged in parallel to form a panel that is a vaporizer,
In an open rack type vaporizer that vaporizes liquefied gas by sprinkling water from a trough placed above the panels, there is a straight rail between the parallel vaporizer panels and a curved section connecting the rails, and a meandering line runs between the panels. 1. An automatic cleaning device using a continuous rail for an open rack type carburetor, characterized in that a rail is continuously constructed, and a cleaning machine having a rotating brush that comes into contact with a panel surface is movably provided on the rail.