JPH08247685A - Heat exchanger for liquid storage tank - Google Patents

Abstract

PURPOSE: To obtain a heat exchanger for a liquid storage tank which has freedom in design and also can meet a modified design easily. CONSTITUTION: A heat exchanger 10 is constructed of a main tube 11 installed vertically practically in a liquid storage tank 1 and of branch tubes 12 fitted to the main tube 11 in such a manner as to slant upward, with a joint 13 interposed. According to this constitution, drainage can be performed reliably, while the branch tubes 12 can be increased or decreased freely in relation with other equipment provided in the liquid storage tank 1, and also a modified design after installation can be prepared freely on account of that freedom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for maintaining the temperature of a liquid stored in a liquid storage tank at a desired temperature.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger for keeping the temperature of a liquid stored in a liquid storage tank at a desired temperature, a commercially available pressure resistant circular pipe, a joint or the like is used to store the liquid in the liquid storage tank. It was formed into a serpentine shape according to the shape, and the serpentine tube was laid in an open-type liquid storage tank for use. Such a use form has an advantage that it can be produced at low cost.

[0003]

However, on the other hand, although it is inexpensive, it is close to continuous piping work in the liquid storage tank, and therefore other equipment installed in the liquid storage tank, for example, a pipe for circulation or a level gauge, There are many restrictions on the design because it must be designed to avoid sensors for thermometers, or to be able to completely drain the drain that occurs after passing steam that is a heat source. However, there is a drawback in that it is difficult to change the installation position and extension of the heat exchanger, and a new design has to be made. The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger for a liquid storage tank, which has a degree of freedom in design and can easily cope with a modified design. Especially.

[0004]

In order to achieve the above-mentioned object, in the present invention, in a heat exchanger for keeping the temperature of a liquid stored in a liquid storage tank at a desired temperature,
The heat exchanger comprises a main pipe installed in the liquid storage tank in a substantially vertical shape, and a branch pipe attached to the main pipe in a slantingly inclined manner. .

Since the branch pipe is attached to the main pipe in a slantingly inclined shape via a joint, the main pipe and the branch pipe can be connected very easily, and the design is easy or changed. It is advantageous in improving the property.

By arranging the main pipe at a corner portion of the liquid storage tank and arranging the branch pipe along a side wall surface of the liquid storage tank forming the corner portion, the liquid storage tank can be effectively used. It is advantageous in that it can be used.

[0007]

Since the heat exchanger is composed of the main pipe installed substantially vertically in the liquid storage tank and the branch pipe attached to the main pipe in a slanting upward slope, the heat exchanger is installed in a slanting slope. Since the drain generated in the branch pipe can be guided to the main pipe by using an inclination, the drain can be reliably discharged, and the number of branch pipes can be increased or decreased in relation to other facilities installed in the liquid storage tank. However, due to the degree of freedom, the modified design after installation can be freely performed.

[0008]

EXAMPLE A heat storage tank heat exchanger according to an example will be described below with reference to the drawings. First, the heat exchanger 10 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a side view of the heat exchanger 10, and FIG. 2 is a perspective view of the heat exchanger 10. In the figure, the heat exchanger 10
Is installed in the liquid storage tank 1 in which water and chemicals are stored,
In this embodiment, it is arranged at the corner portion 4 of the liquid storage tank 1.

Therefore, the heat exchanger 10 is provided with a main pipe 11 installed substantially vertically in the liquid storage tank 1 and a branch pipe 12 attached to the main pipe 11 via a joint 13 in an obliquely upward slope. It consists of and.

More specifically, in the structure of the main pipe 11, a partition socket 17 is welded to the bottom surface of the liquid storage tank 1 so as to vertically penetrate therethrough, and a joint is provided at the upper end of the partition socket 17 via a nipple 16. The main pipe body 11a made of stainless steel is screwed to the upper end of the joint 13. That is, the partition socket 17, the nipple 16,
The tubular body portion of the joint 13 constitutes a part of the main pipe 11. The partition socket 17 and the nipple 16
In the illustrated embodiment, the connection with is shown by connecting with a male taper screw and a female taper screw formed mutually, but by connecting this connecting portion with a union joint, the partition wall The socket 17 and the portion of the main pipe 11 above it can be attached and detached very easily, and the work of installing the heat exchanger 10 in the liquid storage tank 1 can be simplified. The upper end of the main pipe body 11a, which is the upper end of the main pipe 11, is in a closed blind state.

In the structure of the joint 13 portion, the joint 13 shown in the drawing is formed in a two-way state in which a female screw portion 14 for screwing the branch pipe 12 is opened at a substantially right angle, and such a two-way right angle open state. The female screw portion 14 is formed in three rows in the vertical direction. Then, the branch pipe 12 is screwed to the above-mentioned female screw portion 14, but since the female screw portion 14 is formed in a two-direction right angle open state, the left and right branch pipes 1
2 is also in a two-direction right angle open state. In addition, the female screw portion 14
As shown in FIG. 1, the branch pipe 12 is formed so as to project slightly obliquely upward with respect to the body portion of the joint 13.
When is screwed on, the branch pipe 12 is attached to the main pipe 11 in an upwardly inclined manner. This inclination angle is an angle α at which tan α = 2/100 to 30/100.
However, this may be set to an arbitrary value according to the amount of vapor condensation described later. Further, the branch pipe 12 is not necessarily screwed to all the female screw portions 14, and the blind plug 15 is screwed to the female screw portion 14 to which the branch pipe 12 is not screwed.

The branch pipe 12 has the female screw portion 14 at one end thereof.
It is formed of a blind stainless steel pipe having a male threaded portion that is screwed to the other end and the other end closed. The length of the branch pipe 12 may be arbitrarily designed according to the size of the liquid storage tank 1, and the diameter (inner diameter) of the branch pipe 12 will be described later and a drain that flows opposite to the steam 21. If the thickness is such that the mutual flow with 22 is performed smoothly, it may be arbitrarily designed. In this embodiment, the branch pipe 12 having an inner diameter of 30 mm was used.

On the other hand, at the lower end of the partition socket 17,
Drain reservoir 1 in which steam pipe 19 and drain pipe 20 are formed
8 is screwed on. This drain reservoir 18 is a steam pipe 1
The steam 21 injected from the main pipe 11 and the branch pipe 12
The drain 22 (water) changed from the steam 21 in the branch pipe 12 and the main pipe 11 is temporarily stored, and the drain 22 stored in the drain reservoir 18 is the drain. It is designed to flow out from the pipe 20.

The structure of the heat exchanger 10 according to the first embodiment has been described above. The operation of the heat exchanger 10 will be described below. A high-temperature, high-pressure steam 21 flows from the steam pipe 19 into the drain reservoir 18. When the steam 21 is injected into the main pipe 11 through the branch pipe 12 connected to the main pipe 11,
And the temperature of the branch pipe 12 is raised. The heat of the branched pipe 12 that has been raised in temperature is conducted to the chemical liquid stored in the liquid storage tank 1 to raise the temperature of the chemical liquid or hold it at a desired temperature. In the branch pipe 12, the temperature is lowered and a part of the steam 21 is condensed to become a drain 22. In this case, since the drain 22 has a larger specific gravity, the drain 22 naturally accumulates on the bottom surface portion of the branch pipe 12, but since the branch pipe 12 is provided in an obliquely upward slope with respect to the main pipe 11. The drain 22 accumulated on the bottom surface of the branch pipe 12 is guided to the main pipe 11 so as to face the flow of the steam 21, and then the drain reservoir 18 is drained from the main pipe 11.
Is discharged to the outside from the drain pipe 20.

In particular, the heat exchanger 10 according to the first embodiment is
By disposing the main pipe 11 in the corner portion 4 of the liquid storage tank 1,
Since the branch pipes 12 connected to the main pipe 11 in a two-direction right-angled open manner are arranged along the side wall surfaces 2 and 3 of the liquid storage tank 1 forming the corner portions 4, the heat exchanger 10 is stored. Since it can be provided around the liquid tank 1 instead of in the center, the liquid tank 1
Can be used effectively. Further, since the branch pipe 12 is detachably attached to the main pipe 11 through the joint 13, for example, a circulation pipe inserted in the liquid storage tank 1, a liquid level gauge, and a thermometer. In order to avoid equipment such as sensors for use in the branch pipe 12
It is possible to cope with the problem very easily and quickly by removing the female screw portion 14 from the female screw portion 14 and screwing the blind plug 15 therein.
Of course, even if the design is changed after long-term use, the main pipe 1
Since the branch pipe 12 can be easily attached to and detached from the unit 1, it is possible to easily cope with changes in its design.

In the above-described first embodiment, the steam is injected from below and the drain is also extracted from below, but in this case, at least the work of fixing the partition socket 17 to the liquid storage tank 1 by welding is necessary. In order to eliminate such work, a heat exchanger 30 of the type in which the open type liquid storage tank 1 is charged from above as shown in FIG. 3 may be used. The structure of the heat exchanger 30 will be briefly described. Note that FIG.
[Fig. 4] is a perspective view of a heat exchanger 30 according to a second embodiment. In the figure, a heat exchanger 30 includes a main pipe 31 arranged substantially vertically to a corner of the liquid storage tank 1, and a branch attached to the main pipe 31 via a joint 33 in an upward slanting inclination. The pipe 32 and the main pipe 31 are provided inside, the lower end thereof is located slightly above the lower end of the main pipe 31, and the upper end thereof is the main pipe 31.
A drain pipe 34 that extends through the upper end of the
It consists of The lower end of the main pipe 31 is closed to form a drain reservoir, and the joints 33 each have a female screw portion open in two directions at right angles.
A plurality of (3) are provided at a predetermined interval.
The branch pipe 32 is the same as the branch pipe 12 of the first embodiment.

Thus, the heat exchanger 30 according to the second embodiment.
The operation of the above will be described. The steam injected from the upper portion of the main pipe 31 enters the branch pipe 32 from the main pipe 31 and causes the temperature of the branch pipe 32 to rise. The heat of the branched pipe 32 which has been raised in temperature is conducted to the chemical liquid stored in the liquid storage tank 1 to raise the temperature of the chemical liquid or hold it at a desired temperature. In the branch pipe 32, the temperature is lowered and a part of the vapor is condensed to become drain. in this case,
Since the drain has a larger specific gravity, the drain naturally accumulates on the bottom surface of the branch pipe 32. However, since the branch pipe 32 is provided in a slanting slope upward with respect to the main pipe 31, The drain accumulated on the bottom surface is guided to the main pipe 31 so as to face the flow of the steam 21, and then is accumulated in the drain reservoir at the lower end of the main pipe 31. When the liquid level of the drain reservoir rises and reaches the lower end of the drain pipe 34, the pressure of the steam entering the main pipe 31 pushes up the drain in the drain reservoir 34, and finally the drain pipe 34. It is discharged from the pipe 34 to the outside.

Also in the heat exchanger 30 according to the second embodiment, as in the first embodiment, by disposing the main pipe 31 in the corner portion 4 of the liquid storage tank 1, the main pipe 31 is connected to the main pipe 31. Since the branch pipes 32 connected in an open direction at right angles to each other are arranged along the side wall surfaces 2 and 3 of the liquid storage tank 1 forming the corner portions 4, the heat exchanger 30 is disposed in the central portion of the liquid storage tank 1. However, since it can be provided in the surroundings, the liquid storage tank 1 can be effectively used. Further, since the branch pipe 32 is detachably attached to the main pipe 31 via the joint 33,
For example, in order to avoid equipment such as circulation pipes, liquid level gauges, and thermometer sensors that are inserted into the liquid storage tank 1, remove the obstructing branch pipe 32 from the female threaded portion of the joint 33 so as to prevent blindness. By screwing on the plug, it is possible to handle very simply and quickly. Of course, even when the design is changed after being used for a long period of time, the branch pipe 32 can be easily attached to and detached from the main pipe 31, so that the change in the design can be easily dealt with.

In the heat exchanger 10 according to the first embodiment and the heat exchanger 30 according to the second embodiment described above, only the branch pipes 12 and 32 connected to the main pipes 11 and 31 extend horizontally. However, as shown in FIG. 4, a vertical branch pipe 36 may be connected to the end of the branch pipe 32 via an L-shaped joint 35. In other words, the expandability of the branch pipe 32 does not cause any problem as long as the condensed drain is connected in the direction in which it naturally flows down.

Further, as the structure of the joint, it is possible to form the female screw portion 14 which is open in two directions at right angles like the joint 13 of the first embodiment so as to be connected in the vertical direction, or the second embodiment. The joint 33 (joint shown in FIG. 5A) may have a pair of bidirectional right-angled female screw portions 33a, or the unidirectional female screw portion 40a shown in FIG. The joint 40 may be included. Further, as a joint connecting the branch pipe and the extension branch pipe, an acute-angled L-shaped joint 50 shown in FIG. 5C or an obtuse-shaped L-shaped joint 60 shown in FIG. 5D may be used. . Of the above, the joint 40 shown in FIG.
In the case of using, the branch pipe can be attached only in one direction, and therefore the arrangement position of the main pipe is not limited to the corner portion 4 of the liquid storage tank 1, but the vicinity of the side wall surface of the liquid storage tank 1. Can be placed in any position. Furthermore, the method of connecting the main pipe and the branch pipe is not limited to the screw-in type as in the embodiment, but may be flange connection, universal joint connection, welding, or the like. In the case of welding, compared to other connection methods, there is a slight problem in that it responds quickly to changes in design etc., but compared to the conventional flexible pipe type,
Conventionally, a design change requires cutting and welding at a plurality of points and substantially the same labor as a new production, whereas in the case of connecting the main pipe and the branch pipe of the present invention by welding, Cutting and welding can be done in only one place, and it is possible to save time and effort in design change as compared with the conventional case.

In the above-described embodiment, the threaded portion 14 of the joint 13 is formed so as to be obliquely inclined from the beginning with respect to the joint body portion.
(Or a connecting portion in the case of welding) may be formed in a right-angled shape with respect to the main body portion, and the branch pipe 12 itself may be formed in an inclined shape for connection thereto. Also, when the main pipe and the branch pipe are connected by welding, the connection part of the main pipe is cut diagonally, while the end part of the branch pipe is also cut diagonally and the diagonal cut parts of them are welded and inclined. It may be configured to have a shape.

[0022]

As is apparent from the above description, in the present invention, the heat exchanger has a main pipe installed substantially vertically in the liquid storage tank, and an inclined upward slant with respect to the main pipe. Since it consists of a branch pipe that can be attached to
Since the drain generated in the inclined branch pipe can be guided to the main pipe by utilizing the inclination, the drain can be surely drained and the branch pipe can be connected with other equipment provided in the liquid storage tank. Can be freely increased or decreased, and because of the degree of freedom, the modified design after installation can be freely performed.

[Brief description of drawings]

FIG. 1 is a side view of a heat exchanger according to a first embodiment.

FIG. 2 is a perspective view of a heat exchanger according to the first embodiment.

FIG. 3 is a perspective view of a heat exchanger according to a second embodiment.

FIG. 4 is a side view of a heat exchanger according to a third embodiment.

FIG. 5 is a perspective view showing types of joints.

[Explanation of symbols]

 1 Liquid Storage Tank 2 Side Wall Surface 3 Side Wall Surface 4 Corner Corner 10 Heat Exchanger 11 Main Pipe 12 Branch Pipe 13 Joint 14 Female Threaded Part 15 Blind Plug 18 Drain Reservoir 19 Steam Pipe 20 Drain Pipe 21 Steam 22 Drain 30 Heat Exchanger 31 Main pipe 32 Branch pipe 33 Joint 40 Joint 50 Joint 60 Joint

Claims (3)

[Claims] 1. A heat exchanger for maintaining the temperature of a liquid stored in a liquid storage tank at a desired temperature, wherein the heat exchanger includes a main pipe installed substantially vertically in the liquid storage tank. A heat exchanger for a liquid storage tank, comprising: 2. The heat exchanger for a liquid storage tank according to claim 1, wherein the branch pipe is attached to the main pipe in a slantingly inclined shape via a joint. 3. The main pipe is arranged at a corner portion of the liquid storage tank, and the branch pipe is arranged along a side wall surface of the liquid storage tank forming the corner portion. The heat exchanger for a liquid storage tank according to claim 1 or 2.