JPS5937571Y2 - Open rack type vaporizer water sprinkler system - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a water sprinkler device for an open rack type vaporizer that vaporizes liquefied natural gas.

Generally, liquefied natural gas (hereinafter referred to as i'LNG) is vaporized and then used as fuel for power generation, city gas, or the like.

Various types of heat exchangers are used as LNG vaporizers depending on the purpose, but in recent years some types of heat exchangers have been opened due to economic efficiency, equipment stability, and ease of handling. Rack type vaporizers are often used.

For example, as shown in FIG. 1, a conventional open rack type vaporizer includes an LNGK general-purpose panel 3 in which a large number of tubes are arranged in a curtain shape between an upper header 1 and a lower ladder 2; Box-shaped troughs 4, 4 each having an open top surface are provided on both sides of the upper part of this panel 3.
A partition plate 5 for stable movement of fluid is installed inside, and a water sprinkler pipe 6 is installed inside.
It consists of a water sprinkler device 1 that is capable of supplying water.

Then, the LNG introduced from Ladder 2 to the bottom is panel 3.
While rising through the interior, the seawater or water from the sprinkler I overflows the edge 8 of the trough 4 and reaches the panel 3.
By flowing as a falling liquid film 9 on the surface, heat is exchanged through the panel 3 surface, and the LNG is vaporized and used as NG (natural gas) from the upper header 1.

Incidentally, seawater or industrial water is used as an external heat source for vaporizing the LNG, but seawater is usually used from the economic point of view.

However, when seawater is used, algae and shellfish in the gradation
Due to the attachment of marine organisms, the gap between the bottom of the trough 4 and the lower end of the partition plate 5 and the gap between the edge 8 of the trough 4 and the panel 3 is blocked, and a part of the falling liquid film 9 is blocked. As a result, the 3 sides of the panel in this area are locally cooled by the LNG, and the LNG is only partly vaporized.
There is a risk that the surface will be exposed to local thermal stress, and there is a disadvantage that attached marine organisms must be removed periodically.

Therefore, the inventor conducted long-term observations and found that, as shown in Figure 2, the shellfish 10 that flowed into the trough 4 grow and accumulate in the retention area of the seawater that not only blocks the seawater passage in the trough 4 but also It was learned that larger shellfish that had grown further flowed downstream and partially blocked the gap between the edge part 8 of the trough 4 and the panel 3.

This idea prevents the blockage of seawater channels by such marine organisms.
This paper proposes a water sprinkling device for an open rack type vaporizer that prevents this problem by using a scraping board.

This invention, as shown in FIGS. 3 and 4, contacts the inner surface of the trough 4 of the water sprinkler 7 and the inner and outer surfaces of the partition plate 5,
Moreover, it is characterized by being provided with a scraping plate 11 that slides in the longitudinal direction inside the trough 4 continuously or intermittently, and the scraping plate 11 has surfaces that contact the trough 4 and the partition plate 5, respectively. is formed of a scratching member 13 made of sponge or synthetic resin, and the scratching member 13 is integrally supported by a frame 12, and has an arbitrary thickness.

In addition, in order to slide the image plate 11, a limit switch 14.14 is attached to the longitudinal end of the trough 4, and a rope 16 with the scraper plate 11 fixed to the center is attached to the trough 4.
The rope 16 is stretched parallel to the trough 4, and one end of the rope 16 is fastened to a pulley 19 fitted around the shaft of the motor 15 installed on the outer side of the trough 4 so that the motor 15 follows the shaft when the motor 15 is driven and can rotate when the motor 15 is stopped. are doing.

Further, a weight 18 is suspended from the other end of the rope 16 via a pulley 11 provided outside the trough 4.

In the above device, when the motor 15 is stopped, the weight 1
8, the scraping board 11 is moved to the left, and when it reaches the left end, the limit switch 14 is activated and the motor 15 is activated.

When the motor 15 is driven, the rope 16 is connected to the pulley 1.
9, the scraping plate 11 moves to the right end, the limit switch 14 is activated, and the motor 15 is stopped.

Note that the limit switch 14.14 is electrically connected to the motor 15.

Also, instead of using the motor as described above, a fifth
As shown in the figure, a box 22 is suspended from one end of a rope 16 via a pulley 19, water is supplied from above the box 22 with a water supply pipe 20, and a hole 23 is bored in the bottom surface of the box 22.
There is also a method of draining more water and utilizing the weight of the amount of water stored in the box body 22.

A valve 21 is fixed via a thin rod and a protruding piece 24 protruding inside the box body 22, and is opened and closed as the box body 22 is moved up and down.

That is, when the box body 22 is in a low position, the valve 21 is closed, and when water is drained through the hole 23 and the weight of water becomes lighter than the weight 18, the scraping board 11 moves to the left.

Then, the box 22 rises, the valve 21 opens, and the box 2
When the weight of water becomes heavier than the water supply weight 18 in the water supply 2, the scraping board 11 moves to the right.

According to this invention, as mentioned above, since the scraping plate contacts the inner surface of the trough and the inner and outer surfaces of the partition plate and slides back and forth, it is possible to prevent the adhesion and propagation of owl and shellfish to the wall surface, and it is possible to prevent them from adhering to the walls as strongly as before. This eliminates the need for removing shellfish.

Further, the sliding device for the scraping plate is not limited to the above, and there are various methods such as fixing the scraping plate to the end of the cylinder and sliding it, or using a screw.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the operating principle of an open rack vaporizer, Figure 2 is a perspective view showing the distribution of shellfish adhering to the watering device of a conventional open rack type vaporizer, and Figure 3 is a perspective view showing the water spraying system of this invention. FIG. 4 is an explanatory view showing one embodiment of the scraping board sliding device of this invention; FIG. 5 is a perspective view showing the main parts of the device;
Is the figure another example of the same as above? FIG. In the figure, 4... trough, 5... partition plate,
6... Water pipe, T... Water sprinkler device, 8.
...Edge part, 9...Falling liquid film, 11.
... Scraping board, 12 ... Frame, 13 ...
... Bow 1 scraping member, 14 ... Limit switch, 15 ... Motor, 16 ... Low, ;', 17.19 ... Pulley, 18...
...Weight.

Claims (1)

[Scope of utility model registration request] In an open rack type vaporizer consisting of a panel with a plurality of heat transfer tubes installed between the upper header and the lower header, and a water sprinkler with a Vf installed at the top of the panel, the trough of the water sprinkler is A water sprinkling device for an open rack type vaporizer, characterized in that it is provided with a scraper plate that contacts the inner surface of the trough and the inner and outer sides of the partition plate and slides continuously or intermittently in the longitudinal direction within the trough.