JPH0481675B2 - - 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 8, 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, dirt on the surface of the panel 1 can be removed by stopping the operation of the vaporizer, installing a scaffold between the parallel panels 1 and 1, and manually cleaning the surface with a brush or jet water, as shown in Figure 9. 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 rotating brush of an open rack type vaporizer, which can automatically clean even a large panel surface without manual effort, which has conventionally been done manually by setting up a scaffold.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention includes a plurality of heat transfer tubes with fins extending substantially parallel to the heat transfer tube axis arranged vertically between an upper header and a lower header. In an open rack type vaporizer, the liquefied gas is vaporized by sprinkling water from a trough placed above the panels, and the rails installed parallel to the panels are used as guides to connect the panels. The gist is that a self-propelled traveling trolley is provided with a vertical guide frame and a rotating brush that moves up and down along the frame toward the panel surface.

[Effect]

According to the present invention, the bristles of the brush rub the panel surface while rotating, and the brush moves up and down along the guide frame while washing the panel surface using running water from the trough. Further, as the traveling cart moves along the panel surface, the rotating brush that moves in the vertical direction also moves in the direction of the panel surface, cleaning the front surface of the panel without leaving any residue.

〔Example〕

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

Fig. 1 is an explanatory diagram showing one embodiment of an automatic cleaning device using a rotating brush for an open rack type vaporizer according to the present invention, Fig. 2 is a front view of the same as above, and Fig. 3 is a partially cutaway front view of the same as above. Reference numeral 3 indicates a rail having an H-shaped cross section and is installed in an upper position between the panels 1 in parallel with the panels 1. Reference numeral 4 indicates a running cart that runs by itself using the lower flange of the rail 3 as a guide.

A rectangular cylindrical guide frame 5 is suspended from the lower part of the traveling carriage 4, and an air motor 6 is housed in the lower part of the guide frame 5. Similarly, a support post 7 is vertically installed near the guide frame 5 from the traveling carriage 4, and sprockets 8 and 9 are installed between the middle and lower ends of the support post 7, and the chain belt 1 is attached to these.
0 was wound. Further, the lower sprocket 9 and the output shaft of the air motor 6 are connected by a bevel gear 11 on the output shaft side and a bevel gear 12 meshing with the bevel gear 11.
A rotating shaft 1 having a spur gear 13 at one end and a spur gear 13 at the other end.
4, and is connected via a spur gear 15 that meshes with the spur gear 13 and is coaxial with the sprocket 9.

On the other hand, as shown in FIG.
A total of two rotating brushes 18 made of nylon and rotated by an air motor 17 are arranged side by side on the left and right sides. In the figure, reference numeral 19 denotes a guide roller that is provided on the elevating head 16 and rolls around the outer circumference of the guide frame 5. One end of a connecting rod 20 serving as a link was pivotally attached to the side of the lifting head 16, and the other end of the connecting rod 20 was pivotally attached to the chain belt 10.

The traveling cart 4 may have its own drive motor for driving, but in this embodiment, an air motor 6 is used.

FIG. 5 is a longitudinal sectional side view of a portion of the traveling carriage 4, in which wheels 21 are provided facing inward from a housing 4a having a U-shaped cross section, and are brought into contact with the upper surface of the lower flange of the rail 3.

On the other hand, a sprocket 23 is provided coaxially with the sprocket 8 provided in the middle of the support post 7, and this is connected to a sprocket 26 provided at the end of the rotating shaft 25 in the lower part of the housing 4a via a chain belt 24.
A worm gear 2 is connected to the rotary shaft 25, and a worm gear 2 is connected to the
A gear 29 is provided at the end of a rotating shaft having a gear 28a in the center that meshes with the worm gear 27, and this gear 29 meshes with a gear portion 21a having teeth cut into the flange of the wheel 21.

In the figure, 30 is a sprocket for tensioning the chain belt 24, 31 is a guide roller provided horizontally at the upper end of the housing 4a and comes into contact with the side surface of the upper flange of the rail 3, and 32 is a spring built into the lower support stand ( (not shown) These guide rollers 31 and 32 are pressed against the lower surface of the rail 3 by the elasticity of the spring, and these guide rollers 31 and 32 have the role of preventing the bogie 4 from wobbling while traveling.

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.

Further, a guide frame 5 hanging down from the traveling truck 4 is located in the center between the panels 1, 1 parallel to the surface of the panel 1, and a nylon rotating brush 1 of the lifting head 16 is attached so as to hold the guide frame 5.
The tip of the brush 8 is in contact with the surface of the panels 1, 1.

In this state, if the air motor 17 is started and the rotary brush 18 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 6 is driven while rotating the rotary brush 18 in this way, the sprocket 9 will rotate via the transmission member bevel gear 11 → bevel gear 12 → rotating shaft 14 → spur gear 13 → spur gear 15 → the sprockets 8, 9. The chain belt 10 in between also rotates. This chain belt 1
0 movement, the elevating head 16 is also pushed up along the guide frame 5 via the connecting rod 20, and when the connecting rod 20's pivot point to the chain belt 10 exceeds the upper sprocket 8, the chain is moved upward. Following the belt 10, the head 16 descends.

In this way, the rotating brush 18 moves up and down along the guide frame 5 while rotating itself, but the rotation of the sprocket 8 is also caused by the rotation of the sprocket 23 → chain belt 24 → sprocket 26 →
The transmission is transmitted from the rotating shaft 25 to the worm gear 27 to the gear 28a, and the wheel 21 rotates. As a result, the cart 4 moves forward along the rail 3, and the rotary brush 18 moves on the surface of the panel 1 while drawing a trajectory as shown in FIG. 6 to thoroughly clean the entire surface. Further, since the guide frame 5 is a prismatic column and the elevating head 16 is also a prismatic cylinder, the head 16 will not rotate even if the rotating brush 18 receives a reaction force.

Note that if a single air motor is not shared as in this embodiment, but separate motors are used for raising and lowering the rotating brush and for moving the traveling cart, and the motor for moving the cart is driven intermittently, the rotation The trajectory of the brush 18 over the entire panel is as shown in FIG.

Furthermore, as another embodiment, it is also conceivable that rails are laid on the ground and the traveling cart is made to travel on these rails. In this case, the guide frame also rises upward from the traveling carriage. Furthermore, if it has a means of determining the direction of travel, such as radio control or a method of following a target, it can be used even with a traveling bogie without rails.

〔Effect of the invention〕

As described above, the automatic cleaning device using a rotating brush for an open rack type vaporizer of the present invention has the following features:
As a cleaning device for open rack type vaporizers for liquefied gases such as LNG, it is installed between panels that have enough space for a person to fit in, but has a small working space, and can automatically clean the panel surface without human intervention. In this case, the cleaning action can also be carried out during operation without stopping the operation of the vaporizer. In addition, since it does not require human hands, it is safe and does not require scaffolding, etc. Furthermore, cleaning can be started at any time, so it can be cleaned frequently without leaving it for a long time, and it does not accumulate dirt and reduce heat exchange efficiency. There is no need to worry about the situation or the situation where the sewage film becomes easily disturbed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of an automatic cleaning device using a rotating brush for an open rack type vaporizer according to the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is a partially cutaway front view of the same as above, and Fig. 4 The figures are a sectional view taken along the line A-A in Fig. 3, Fig. 5 is a vertical sectional side view of the traveling truck portion, Fig. 6 is an explanatory diagram showing the locus of the rotating brush, and Fig. 7 is an illustration of the rotating brush according to another embodiment. FIG. 8 is a partial perspective view of an open rack type carburetor, and FIG. 9 is an explanatory diagram showing a conventional example. 1...Panel, 2...Trough, 3...Rail,
4... Traveling truck, 4a... Housing, 5... Guide frame, 6... Air motor, 7... Support post, 8, 9... Sprocket, 10... Chain belt, 11, 12... Bevel gear, 13, 1
5... Spur gear, 14... Rotating shaft, 16... Elevating head, 17... Air motor, 18... Rotating brush, 19... Guide roller, 20... Connecting rod,
21...Wheel, 21a...Gear part, 23, 26...
...Sprocket, 24...Chain belt, 2
5, 28... Rotating shaft, 27... Worm gear, 2
8a, 29... Gear, 30... Tension sprocket, 31, 32... Guide roller.

Claims (1)

[Claims] 1. A panel serving as a vaporizer is formed by vertically arranging a large number of heat transfer tubes with fins extending substantially parallel to the heat transfer tube axis between the upper header and the lower header,
In an open-rack type vaporizer that vaporizes liquefied gas by sprinkling water from a trough placed above the panels, a vertical guide is attached to a traveling trolley that moves between panels using rails installed parallel to the panels as guides. An automatic cleaning device using a rotating brush for an open rack type vaporizer, characterized by having a frame and a rotating brush that moves up and down along the frame and facing the panel surface. 2. An automatic cleaning device using a rotating brush for an open rack type carburetor according to claim 1, wherein the same motor is used as a drive source for raising and lowering the rotating brush and for traveling the traveling cart. 3. The automatic cleaning device using a rotating brush for an open rack type carburetor according to claim 1, wherein the lifting and lowering of the rotating brush and the traveling of the traveling carriage are performed by separate drive motors.