JPH0539267Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an open rack type vaporizer for vaporizing liquefied natural gas, and prevents the bowing phenomenon that occurs in the header tank of the heat exchange panel and prevents the bowing phenomenon from occurring in the header tank of the heat exchange panel. This invention relates to an open rack type vaporizer that reduces stress and extends the life of panels.

BACKGROUND ART An open rack type vaporizer, for example, has a finch tube with a pair of fins protruding in the diametrical direction, arranged in the direction of the fins to form a single panel, and header tanks are provided at the upper and lower ends of the finch tube to form a heat exchange panel. It is a structure in which a plurality of panels are arranged in parallel, and seawater as a heat medium flows down onto the heat exchange panel surface from a water sprinkler arranged above each panel.

In conventional vaporizers, there are problems such as during operation, the heat medium such as seawater that is sprinkled is scattered on the upper outer periphery of the horizontally arranged lower header tank, and the amount of heat medium that flows down to the lower outer periphery is significantly reduced. This caused a temperature difference in the vertical direction of the lower header tank, causing the header tank to deform into an arched shape.

When such a bowing phenomenon occurs, the lower part of the finch tube, especially the part where the fins are removed during assembly to be welded to the header tank during assembly, will bend, and the stress will increase due to the change in shape due to the removal of the fins. There were problems with durability, such as damage to parts and equipment.

In addition, in order to prevent this Boeing phenomenon,
A technique has been proposed (Japanese Patent Publication No. 56-34758) in which a heat-insulating structure is attached to the lower header tank to limit heat input from the outside.

However, the above-mentioned heat-insulating structure may cause problems such as corrosion of structural materials by seawater.

In addition, in order to prevent the heat medium from colliding and scattering at the top of the lower header tank during watering, a side plate for water storage is placed at the bottom of the heat exchange panel, and water is stored between the panel and the side plate to prevent the falling water from colliding with the heat medium and scattering. A carburetor with a structure that reduces impact is proposed (publication of Utility Model Publication No. 58-22477)
However, the effect of improving the supply of heat medium to the bottom part of the lower header tank was insufficient, and heating only the upper part due to water storage caused a temperature difference, making it impossible to achieve uniform heating.

Purpose of the invention In view of the above-mentioned current situation, this invention aims to provide an open rack type carburetor that can prevent the bowing phenomenon that occurs in the lower header tank, extend the life of the panel, and has a simple structure and easy installation. There is.

Summary of the idea This idea consists of a heat exchange panel made up of a series of finch tubes and header tanks installed at the top and bottom ends, a plurality of heat exchange panels arranged in parallel, and water sprayed from water sprinklers placed above each panel to generate liquefied gas. In an open rack type vaporizer that vaporizes
At least on both sides in the longitudinal direction of each lower header tank of the heat exchange panel, a gutter-shaped water guiding plate is arranged facing each other at a required interval from both sides of the lower header tank to the bottom surface, and on one side or shoulder of the lower header tank. This is an open rack type vaporizer characterized in that the falling heat medium is caused to flow down around the lower header tank by means of a water stop plate that is erected in the longitudinal direction of the header tank.

Structure of the device This device has water conductivity and water stoppage that have the function of capturing the heat medium falling along the panel on the side surface of each lower header tank of a plurality of heat exchange panels and causing it to circulate around the lower header tank. It is characterized by installing a board.

This invention can reduce the temperature difference between the upper and lower surfaces of the lower header tank by using the water stop plate and the water guiding plate, and the lower fin cut-off part of the finch tube due to the bowing phenomenon that occurs due to the temperature difference between the upper and lower surfaces of the lower header tank. It can reduce the stress on

As a result, it prevents damage to the finch tube attachment part and improves the durability of the heat exchange panel.Although it has a simple structure with only a water guiding plate and a water stop plate, it is effective in eliminating the temperature difference between the upper and lower surfaces of the lower header tank. It has the advantage of being highly effective, easy to install, whether existing or new, and inexpensive.

In this invention, the water guide plate and water stop plate attached to the required positions of the lower header tank are as described above.
As long as it has the function of capturing the heating medium falling along the panel and circulating it around the lower header tank, it can be used in any shape, configuration, or material. However, if the heating medium is simply stored in water, the thermal To avoid imbalance, it is necessary to appropriately select the dimensions and shape of the finless part of the finch tube, the facing distance from the lower header tank, the shape of the plate, etc., so that it is easy to circulate and flow down.

In this invention, the water guide plate and water stop plate are disposed opposite to the lower header tank at the inlet of the lower header tank and the end cap on the opposite side, or along the entire length of the lower surface of the lower header tank, as shown in Figure 2. It may be selected as appropriate depending on the temperature difference between the upper and lower surfaces of the lower header tank and its distribution, or the configuration of the heat exchange panel.

Disclosure of the invention based on drawings This invention will be described in detail below based on drawings of embodiments. FIG. 1 is a vertical cross-sectional view and a front view of the lower header tank of the open rack type carburetor according to this invention. FIG. 2 is an explanatory front view of the vaporizer showing the installation locations of the water stop plate and the water guide plate according to this invention.

As shown in Fig. 1, the open rack type carburetor has a finch tube 2 with a plurality of pairs of fins protruding from the periphery arranged in a predetermined fin direction to form a single panel, and a header tank at the upper and lower ends of the finch tube 2. 3 (the upper part is not shown) to constitute the heat exchange panel 1. Although not shown, this heat exchange panel 1
Each header tank is orthogonally connected to one manifold, and seawater as a heat medium flows down onto one surface of the heat exchange panel 1 from a water sprinkler placed above each heat exchange panel 1.

The lower end of each finch tube 2 has a finless portion 2a with the fin removed, and this finless portion 2a is erected by welding to an opening at the upper end of the outer circumference of the lower header tank 3.

Therefore, there is a space between the lower ends of each of the upright fin tubes 2 due to the finless portion 2a.

A water guide plate 4 and a water stop plate 5, which have the function of causing seawater to circulate around the lower header tank 3 and flow down, are attached to predetermined positions in the longitudinal direction of the lower header tank 3.

For example, as shown in Fig. 2a, there are two locations, one on the inlet side of the lower header tank 3 where the finch tube 2 is installed and the other on the end cap side, or as shown in Fig. 2b, from the inlet side of the lower header tank 3. It can be placed over the entire length of the end cap side.

As shown in FIG. 1, the conductive plate 4 is made of a gutter-like member having a substantially U-shaped cross section with different heights on both sides, and is opposed to the outer circumferential surface of the lower header tank 3 at a required distance. It is arranged so as to enclose the fin-less portion 2a at the lower end of each fin reverb 2 and the entire lower header tank 3. Any suitable fixing method can be used, such as fixing the closing plates at both ends of the water guide plate 4 to the lower header tank 3.

The water stop plate 5 is made of a long plate with a required height, and is erected in the longitudinal direction from one side of the lower header tank 3 in the water guide plate 4 to a desired position on the shoulder.

At this time, the top of the water stop plate 5 is set at the same height as the tip of the higher side of the water guide plate 4.

As shown in FIG. 1a, by providing the water guide plate 4 and the water stop plate 5, the seawater that falls along the heat exchange panel 1 to the upper part of the lower header tank 3 is prevented from reaching the water stop plate 5 at the same height. The seawater trapped between one side of the water guide plate 4 and falling inside the water stop plate 5 passes through the space of the fin cutout 2a at the top of the lower header tank 3, and the seawater that falls to the water guide plate 4 side is transferred to the lower header tank. 3 Changes direction from the top to the bottom, flows down around the lower header tank 3, passes between the outside of the water stop plate 5 and the water guide plate 4 on the other side, which is lower in height, and flows through the water guide plate 4.
It overflows from the edge on the other side and falls.

That is, the seawater flows down around the lower header tank 3.

In the vaporizer with the above configuration, when the extremely low temperature liquefied gas distributed and supplied by the My Hold enters the lower header tank 3, there is a temperature difference between the upper and lower surfaces of the lower header tank 3 as seawater falls. As a result, the lower header tank 3 is deformed so that its inlet side arches downward.

However, by arranging the water guide plate 4 and the water stop plate 5 in the lower header tank 3, the temperature difference between the upper and lower surfaces of the lower header tank 3 is reduced to a fraction of that in the conventional case where these are not provided. , the life of the heat exchange panel 1 is significantly extended.

Effects of the invention By arranging the water guide plate 4 and the water stop plate 5 in the lower header tank, the open rack type vaporizer according to this invention reduces the temperature difference between the upper and lower surfaces of the lower header tank compared to the conventional case without a rectifying plate. This significantly reduces the bowing phenomenon that occurs in the lower header tank, reduces the accompanying thermal stress, eliminates damage to the finless area, and dramatically extends the life of the heat exchange panel. can.

In addition, although the structure is simple, it is highly effective in eliminating temperature differences between the upper and lower surfaces of the lower header tank, and has the advantage of being easy and inexpensive to install regardless of whether it is an existing or new installation.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view and a front view of the lower header tank of the open rack type carburetor according to this invention. FIG. 2 is an explanatory front view of the vaporizer showing the installation locations of the water stop plate and the water guide plate according to this invention. 1...Heat exchange panel, 2...Finch tube,
2a...No fin, 3...Lower header tank, 4...Water guide plate, 5...Water stop plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A heat exchange panel is constructed by arranging finch tubes and providing header tanks at the upper and lower ends, a plurality of heat exchange panels are arranged in parallel, and water is liquefied by sprinkling water from water sprinklers installed above each panel. In an open rack type vaporizer that vaporizes gas, a finless section is provided at the bottom of each finch tube.
At least on both sides in the longitudinal direction of each lower header tank of the heat exchange panel, a gutter-shaped water guiding plate is arranged facing each other at a required interval from both sides of the lower header tank to the bottom surface, and on one side or shoulder of the lower header tank. An open rack type vaporizer characterized in that a falling heat medium is caused to flow down around a lower header tank by means of a water stop plate installed in the longitudinal direction of the part.