JPH09276601A - Distillation tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distillation tower in which apparatus arrangement area in a plane is saved as much as possible, of which the structure is simplified and the maintenance work is made easy, and whose heat exchange efficiency decrease is suppressed as much as possible. SOLUTION: An aperture 11 for installation of a heat exchanging apparatus as a re-boiler is so formed as to face toward the bottom of a tower 10, a tube bundle 21 extended in the up and down direction from the lower part side of the tower 10 through the aperture 11 is inserted in the vertical direction to install a heat exchanger 20 in the tower 10, and further a cylindrical guide barrel 30 having a liquid intake 30i in the lower circumferential face is installed in the inside of the tower 10 as to surround the tube bundle 21 of the heat exchanger 20 installed in the tower 10 by the guide barrel 30.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a distillation column having a heat exchanger as a reboiler inside the column.

[0002]

2. Description of the Related Art As an example of a distillation column in plant equipment, a distillation column A shown in FIG. 5 in which a heat exchanger (reboiler) C is inserted at the bottom of a column B is well known.
In this distillation column A, the tube bundle Ca is horizontally inserted from the side, and the heat exchanger C is installed inside the column B.

[0003]

By the way, in the distillation column A having the above-mentioned structure, the diameter dimension of the column B must be set according to the length of the tube bundle Ca. There is a possibility that the heat exchanger C may become large in size, and when the heat exchanger C is taken out for maintenance, it is necessary to secure a space for drawing out the heat exchanger C to the side of the tower B. There was an unavoidable inconvenience that the above-mentioned equipment arrangement area was enlarged by people. Also,
In the distillation column A configured as described above, the long tube bundle C
Since the support means D for supporting a is required to be provided inside the tower B, not only the structure becomes complicated, but also in order to pull out the heat exchanger C to the side at the time of maintenance, the heat exchanger C needs to be Since the installation position is high, a special construction machine is required, which causes inconvenience of complicated maintenance work. The purpose of the present invention is
In view of the actual situation as described above, it is possible to achieve space saving of the equipment placement area on the plane as much as possible, and it is possible to prevent complexity of the structure and complication of work related to maintenance. Another object of the present invention is to provide a distillation column capable of preventing a decrease in heat exchange efficiency as much as possible.

[0004]

Therefore, in the distillation column according to the present invention, an opening for installing a heat exchanger is provided at the bottom of the column so as to face downward, and a vertical direction is applied from the lower side of the column through this opening. The heat exchanger is installed inside the tower by vertically inserting the tube bundle extended to the column, and the upper open cylindrical guide barrel having a liquid inlet on the lower peripheral surface is installed in the tower. The tube bundle of the heat exchanger installed inside the tower is surrounded by the guide barrel.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. 1 to 4
FIG. 1 shows an example in which the present invention is applied to a methanol distillation column of a plant. As is clear from FIG. 1, the distillation column 1 is provided with a column 10 extending in the up-down direction and installed inside the column 10. A vertical heat exchanger (reboiler) 20 is provided.

The tower 10 has an opening 11 at the bottom thereof for installing the heat exchanger 20. The opening 11 is formed so as to face downward, and the heat exchanger is provided at the outer peripheral edge thereof. A flange 12 for fixedly installing 20 is formed. In addition, the tower 10 is supported by the above-ground height that secures a space where the heat exchanger 20 can be drawn out below the opening 11 via the pillars H, H ... Standing on the ground G.

Further, a manhole 13 is provided on the side of the tower 10.
Is provided, and a beam 14 is installed inside the tower 10. The beam 14 is provided with a hook 15 used for maintenance of the heat exchanger 20 and the like.

On the other hand, the heat exchanger 20 is provided with a tube bundle 21 extending in the vertical direction, a head 22 and a flange 23, and a hook 24 used at the time of maintenance or the like is provided above the tube bundle 21. It is provided.

This heat exchanger 20 includes a tube bundle 2
1 is vertically extended, the tube bundle 21 is vertically inserted from the lower side of the tower 10 through the opening 11, and the flange 23 and the flange 12 of the opening 11 are bolted to each other. , Is vertically fixed to the tower 10.

The heat exchanger 20 is preferably provided with a hairpin type tube bundle because it is arranged vertically, and a heat source (for example, steam) is supplied into each tube and condensate is supplied. It is preferable that the dividing plate that separates the extraction flow passage from is provided in a cross division or more in order to make the heat transfer to the liquid stored in the column 10 as uniform as possible.

On the other hand, a guide barrel 30 having a substantially cylindrical shape is provided inside the tower 10. The guide barrel 30 communicates with the opening 11 of the tower 10 and extends in the vertical direction, and heat exchange is performed. It is fixedly installed at the bottom of the tower 10 so as to surround the tube bundle 21 in the vessel 20.

A plurality of liquid inlets 30 for communicating the inside and outside of the guide barrel 30 are provided on the lower peripheral surface of the guide barrel 30.
i, 30i ... are formed while the guide barrel 30 is formed.
An opening 30o opened upward is provided at the top of the.

Further, as shown in FIG. 1, the height dimension of the guide barrel 30 is set such that the distillation column 1 is in operation during operation.
The opening 30o at the top is set higher than the liquid level of the liquid L stored at the bottom of the.

As shown in FIGS. 2 to 4, the guide barrel 30 is composed of a base 30A and a barrel 30B. The base 30A has a cylindrical shape and has an opening 11 at the bottom of the tower 10. It is fixedly installed so as to communicate with each other.

On the other hand, the barrel 30B is a cylindrical member detachably bolted to the base 30A,
A plurality of semi-circular notches formed in the lower edge portion in a manner of releasing downward and a plurality of semi-circular notches formed in an aspect of releasing in the upper edge portion of the base 30A are associated with each other. According to the plurality of liquid intakes 30i, 30i ...
Is configured.

Further, the barrel 30B has four upper parts 30u, 30u ... and four lower parts 30l,
A total of 8 parts, such as 30 l, are assembled into a cylindrical shape by bolting them together, and the barrel 30B can be easily disassembled into 8 parts by unbolting the bolting.

As shown in FIG. 1, the flange 12 of the opening 11 in the tower 10 is provided with a drain nozzle P which communicates the inside and outside of the guide barrel 30, and the bottom of the tower 10 has inside and outside of the tower 10. A drain nozzle Q communicating with each other is provided, and each cock (not shown) interposed between these drain nozzles P and Q is closed when the distillation column 1 is in operation.

When the distillation column 1 having the above-mentioned structure is in operation, the liquid L stored in the bottom of the column 10 as shown in FIG. 1 flows from the liquid intake port 30i to the bottom of the guide barrel 30 as shown by an arrow I. Flows into the guide barrel 3 and is heated by contacting the tube bundle 21 of the heat exchanger 20.
0, go up and go through the top opening 30o to the arrow K
After overflowing as described above, it descends outside the guide barrel 30 and again flows into the guide barrel 30 via the liquid intake port 30i, and this circulation constitutes a thermosiphon.

By the way, when the heat exchanger 20 is installed vertically in the tower 10, the tube bundle 2 is re-boiling.
The air bubbles generated between the plurality of tubes forming part 1 cover the heat transfer surface of the tube bundle 21,
There is a possibility that the heat exchange rate between the liquid and the tube bundle 21 may be reduced.

In order to eliminate such an inconvenience, in the distillation column 1 having the above-mentioned structure, the tube bundle 21 of the heat exchanger 20 is surrounded by the guide barrel 30, so that the liquid flowing into the guide barrel 30 can be prevented. Heated intensively by the tube bundle 21 and the guide barrel 3
The liquid circulation at the bottom of the column 10 is activated by encouraging the liquid to rise inside 0.

As a result, the bubbles generated on the heat transfer surface of the tube bundle 21 are driven up by the liquid that rises vigorously inside the guide barrel 30, so that the bubbles can be prevented from covering the heat transfer surface of the tube bundle 21. ,
Therefore, it is possible to prevent the heat exchange rate from decreasing as much as possible due to the vertical installation of the heat exchanger 20.

On the other hand, when performing maintenance on the heat exchanger 20, after the operation of the distillation column 1 is stopped,
Open the cock (not shown) of the drain nozzle Q to open the tower 1
0, the liquid stored inside 0 is discharged, and further, a cock (not shown) in the drain nozzle P is opened to discharge the liquid stored inside the guide barrel 30, and then the flange 12 of the tower 10 is discharged. Flange 2 of heat exchanger 20
The bolt connection with 3 is released, and the heat exchanger 20 is drawn downward from the opening 11 of the tower 10.

At this time, since the heat exchanger 20 is pulled out immediately below the tower 10, the hook 15 inside the tower 10 and the heat exchanger 2
By connecting the hook 24 of 0 with a simple device such as a chain block and utilizing the own weight of the heat exchanger 20,
The heat exchanger 20 can be easily taken out from the tower 10 without requiring a special construction machine.

The tower 10 is supported by the pillars H, H ... Standing on the ground G at a height above the ground where a space for extracting the heat exchanger 20 is secured in the lower region of the opening 11 as described above. After being pulled out to the lower area of the tower 10,
After the maintenance, the heat exchanger 20 is returned to the tower 10
Is vertically inserted from the lower region of the column and is vertically fixed to the tower 10 by bolt connection.

Here, the heat exchanger 20 installed vertically with respect to the tower 10 supports the entire weight including the tube bundle 21 inserted into the tower 10 by the flange 12 at the bottom of the tower 10. Therefore, there is no need for supporting means for supporting the tube bundle 21 inside the tower 10, and since the heat exchanger 20 is installed in a vertical shape, the tower 10 that is vertically extended from the original The shape of the heat exchanger 20 does not adversely affect the shape.

In this way, the heat exchanger 20 for the tower 10 is
Since the tower 10 is installed vertically, the diameter of the tower 10 does not increase more than necessary, and the heat exchanger 20 and
When taking out the heat exchanger 20, the heat exchanger 20 is installed in the tower 1 as described above.
Since it is pulled out to the lower region of 0, space saving of the equipment arrangement area on the plane is achieved as much as possible.

Further, since the heat exchanger 20 is installed in a vertical shape, the total weight of the heat exchanger 20 is supported by the bottom of the tower 10. Therefore, it is necessary to provide a separate support means inside the tower 10 as described above. There is also no heat exchanger 20 from the tower 10
When taking out, since it can be pulled out downward by utilizing its own weight as described above, it is possible to prevent the structure from becoming complicated and the work involved in maintenance from becoming complicated.

On the other hand, since the guide barrel 30 surrounding the tube bundle 21 is composed of the base 30A and the barrel 30B which are detachably bolted to each other, the interior of the tower 10 is removed by removing the barrel 30B from the base 30A. Can be easily cleaned. Further, by disassembling the barrel 30B into a plurality of upper parts 30u and lower parts 30l, the barrel 30
The cleaning work of B can also be carried out easily.

In the above-mentioned embodiments, the present invention is applied to a methanol distillation column, but the present invention is effective not only as a distillation column for methanol but also as a distillation column in various plants. Of course, it can be applied to.

[0030]

As described above in detail, in the distillation column according to the present invention, an opening for installing a heat exchanger as a reboiler is provided so that the bottom of the column faces downward, and the tower is opened through this opening. Insert the tube bundle vertically extending from the lower side of the, install the heat exchanger inside the tower,
Further, a tubular guide barrel having a liquid inlet on the lower peripheral surface and being opened upward is provided inside the tower, and the guide barrel is configured to surround the tube bundle of the heat exchanger. According to the above configuration, by installing the heat exchanger vertically with respect to the tower, the diameter dimension of the tower does not become unnecessarily large due to the shape of the heat exchanger, and the heat from the tower is further removed. When the exchanger is taken out, the heat exchanger is pulled out to the lower side of the column, so that it is possible to achieve the space saving of the equipment arrangement area on the plane as much as possible. Also,
According to the above configuration, since the heat exchanger is installed vertically with respect to the tower, the total weight of the heat exchanger is supported by the bottom of the tower, so that the support means for supporting the tube bundle inside the tower. When there is no need to provide a heat exchanger and the heat exchanger is taken out from the tower, the heat exchanger can be pulled out to the lower part of the tower by utilizing its own weight, which complicates the structure and complicates maintenance work. Can be prevented. Furthermore, according to the above configuration, by enclosing the tube bundle of the heat exchanger by the guide barrel,
The convection of the liquid inside the column is promoted, and thus the reduction in heat exchange efficiency due to the vertical installation of the heat exchanger can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a side sectional view conceptually showing a distillation column according to the present invention.

FIG. 2 is a fragmentary side view showing a guide barrel of a distillation column according to the present invention.

[FIG. 3] III in FIG. 2 showing the cross-sectional shape of the guide barrel
-III line sectional drawing.

[Fig. 4] IV- in Fig. 2 showing the cross-sectional shape of the guide barrel
IV line sectional drawing.

FIG. 5 is a side sectional view conceptually showing a conventional distillation column.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Distillation tower, 10 ... Tower, 11 ... Opening, 20 ... Heat exchanger (reboiler), 21 ... Tube bundle, 30 ... Guide barrel, 30i ... Liquid intake.

Front page continued (72) Inventor Yutaka Terauchi 1-14-1 Minami-Branch Place, Yokohama City, Kanagawa JGC Corporation Yokohama Office (72) Inventor Masaaki Hanaoka 1-1-14 Minami-Branch Place, Yokohama City, Kanagawa Prefecture JGC Corporation Yokohama Office (72) Inventor Takahiro Kobori 1-14-1 Minami-Biery, Yokohama-shi, Kanagawa JGC Corporation Yokohama Office

Claims (2)

[Claims] 1. A distillation column comprising a heat exchanger as a reboiler inside the column, the column having an opening for installing the heat exchanger in a manner facing the bottom, and a tube bundle up and down. The tube bundle is vertically inserted from the lower side of the tower through the opening in a posture in which the heat exchanger is installed inside the tower and the heat exchanger installed inside the tower. A guide barrel having a liquid inlet on the lower peripheral surface and having an open upper tubular shape, and surrounding the tube bundle of the heat exchanger installed inside the tower. And a distillation tower. 2. The distillation column according to claim 1, wherein the guide barrel is composed of a plurality of parts that are disassembled from each other.