JP2004016929A - Internal heat exchange type distillation column and method for producing the same - Google Patents

Abstract

An internal heat exchange type distillation column capable of exhibiting a target distillation performance with less bias in a gas-liquid contact state in a distillation section, and an internal heat exchange type distillation column can be efficiently manufactured. Provided is a method for manufacturing an internal heat exchange distillation column.
A plurality of single pipe units each including a filler layer disposed on an outer peripheral surface of a pipe and a metal sheet covering the filler layer are disposed inside a main body. The inside 4 of each tube 25 and the outside 5 of each tube 25 are isolated, a filler layer 5 a is disposed around each tube 25, and a horizontal (region around the tube) 16 surrounded by the thin metal plate 15 is formed. A heat exchange structure having the same cross-sectional shape is formed.
After preparing a plurality of single tube units and mounting the main body including the lower tube sheet at a predetermined position, disposing the plurality of single tube units in the main body so as to engage with the lower tube sheet. Then, the upper tube sheet is attached to connect the plurality of tubes to the main body.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides an internal heat exchange-type distillation column including a low-pressure column and a high-pressure column, wherein heat is transferred from the high-pressure column (enrichment unit) to the low-pressure column (recovery unit) to exchange heat between the two. It relates to a manufacturing method.
[0002]
Problems to be solved by the prior art and the invention
As a distillation column with excellent energy efficiency, a low-pressure column and a high-pressure column are provided, which are configured to exchange heat between them, and an internal heat exchange type distillation column that does not need to exchange heat with another is known. Have been. From the viewpoint of promoting the energy saving of the distillation operation, this internal heat exchange type distillation column is, of course, the most faithful theory for energy saving, in principle, and it is also recognized from academics. By the way.
[0003]
In addition, as an internal heat exchange type distillation column, a plurality of tubes are connected to the main body by a tube plate at both ends, so that the inside and outside of each tube are separated inside the main body, and the inside and outside of the tubes are formed. Are provided with gas-liquid inlets and outlets, and the operating temperature is made different by making the operating pressure different between the inside and outside of the pipe, and the heat is transferred from the high pressure side to the low pressure side using the pipe wall of each pipe as a heat transfer surface. Thus, there has been proposed a structure in which one distillation column is constituted by using the high-pressure side as a concentrating section and the low-pressure side as a collecting section (Japanese Patent Application Laid-Open No. 8-66601 (Japanese Patent No. 2694425)).
[0004]
As shown in FIG. 5, the internal heat exchange type distillation column includes a main body 1 and a plurality of pipes 25 inserted in the main body 1 at both ends of a tube plate (upper tube plate (tower top tube plate) 3a and It is formed by being connected to the main body 1 by a lower tube sheet (tower tube sheet) 3b). The inside 4 and the outside 5 of each tube 25 have a structure isolated from each other, and the inside 4 is a high-pressure side enrichment section, and the outside 5 is a low-pressure side recovery section. I have.
[0005]
In addition, in the upper part of the main body 1, there are provided a collecting section liquid inlet 6 for supplying liquid to the outside of the pipe (collecting section) 5, and a collecting section steam outlet 7 for extracting vapor from the outside of the pipe (collecting section) 5. In the end chamber 14a above the upper tube sheet 3a and communicating with the inside of the tube (concentrating unit) 4, a liquid inlet 8 for the concentrating unit for supplying a liquid to the inside of the tube (concentrating unit) 4 is provided. In addition, a vapor outlet 9 for the concentrating section for extracting vapor from the pipe (concentrating section) 4 is provided.
[0006]
On the other hand, in the lower part of the main body 1, a recovery section steam inlet 10 for supplying steam to the outside (recovery section) 5 and a recovery section liquid outlet 11 for extracting liquid from the outside of the pipe (recovery section) 5 are provided. In the end chamber 14b below the lower tube sheet 3b and communicating with the inside of the tube (concentrating unit) 4, a steam inlet 12 for supplying steam to the inside of the tube (concentrating unit) 4 is provided. In addition, a liquid outlet 13 for concentrating part for extracting liquid from the tube (concentrating part) 4 is provided.
[0007]
By the way, in such an internal heat exchange type distillation column, the state of gas-liquid contact in the distillation section inside and outside the tube, which constitutes the concentration section or the recovery section, greatly affects the distillation operation. As in the case of the internal heat exchange type distillation column shown in FIG. 5, where the packing is filled outside the tube to form a recovery section (packing tower), if there is a bias in the gas-liquid flow, a target may be obtained. The distillation effect cannot be obtained.
That is, at the top of the packed tower, the liquid evenly sprayed on the upper surface of the packed bed per surface area flows down the surface of the packed material by the attractive force, and the vapor supplied to the bottom of the tower reduces the pressure difference between the top and the bottom of the packed bed. Distillation is performed by raising the gap between the packings as the driving force and contacting the liquid and vapor in the packed tower, but when looking at the gas-liquid flow in the packed tower, the rising steam is usually Since the descending liquid tends to flow to a place where the amount of vapor rises is small, a small drift causes a large drift at an accelerated rate. Therefore, the positional deviation of the ratio between the descending liquid amount and the rising vapor amount increases from the top to the bottom, and as a result, the gas-liquid contact effect as designed, that is, the distillation performance cannot be obtained.
[0008]
Therefore, in the conventional packed tower, the packed bed is divided at every predetermined packed bed height (in general, every 2 to 5 m, depending on the tower diameter), and the packed layer receiving and collecting parts are separated at the divided portions. A liquid device, a liquid dispersing device, and the like are provided so that a gas-liquid contact effect as designed can be obtained. However, in the case of such a configuration, not only the equipment structure becomes complicated, but also the space in which the packed bed receiver, the liquid collecting device, the liquid dispersing device, and the like are disposed does not function as a distillation unit that performs a distillation operation. Therefore, there is a problem that the height of the distillation column is correspondingly increased, which leads to an increase in size of the equipment and an increase in cost.
[0009]
In addition, when a packed tower is filled with packing material outside the tube, the horizontal cross-sectional shape outside the tube is complicated, and the gas-liquid contact state tends to be unbalanced. Problem) becomes more remarkable, and it tends to be more difficult to make the gas-liquid contact state per unit area on a horizontal cross section uniform.
[0010]
The present invention is intended to solve the above problems, and without increasing the cost, there is little bias in the gas-liquid contact state in the distillation section, and an internal heat exchange type capable of exhibiting a target distillation performance. An object of the present invention is to provide a distillation column and a method for producing the same.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the internal heat exchange type distillation column of the present invention (claim 1) is configured such that a plurality of tubes are connected to the main body by means of a tube plate at both ends, so that the inside of the main body is connected to the inside of each tube. The outside of the tube is isolated, and the inside and outside of the tube each have a gas-liquid entrance and exit,
The operating temperature is made different by making the operating pressure different between the inside and outside of the tube, and the heat is transferred from the high pressure side to the low pressure side with the pipe wall of each pipe as the heat transfer surface, so that the high pressure side is the concentrator and the low pressure side is An internal heat exchange distillation column configured to function as a recovery unit,
A filler layer is provided so as to surround an outer peripheral surface of a pipe constituting the plurality of pipes, and the filler layer disposed on an outer peripheral face of the pipe is covered with a metal sheet. Are arranged inside the main body at a predetermined pitch, so that the inside and outside of each pipe are isolated inside the main body, and at least a packing layer is provided around each pipe. And a heat exchange structure having the same horizontal cross-sectional shape in a region surrounded by a thin metal plate of each single tube unit.
[0012]
It has a structure in which a filler layer (a layer filled with the filler) is disposed so as to surround the outer peripheral surface of the pipe, and the filler layer disposed on the outer peripheral surface of the pipe is covered with a metal sheet. A plurality of single pipe units are arranged inside the main body at a predetermined pitch, the inside and outside of each pipe are isolated inside the main body, and at least a filler layer is provided around each pipe. The horizontal cross-sectional shape of the area surrounded by the sheet metal of each single pipe unit is arranged and forms a heat exchange structure having the same shape. The flow is interrupted by the metal sheet surrounding the packing layer, so that the range of the liquid flowing down the outside of the tube can be limited to an area surrounded by the metal sheet (the area around the pipe). A uniform drop in the amount of liquid flowing down the area around the pipe As the resistance, it is possible to raise each tube surrounding region.
Therefore, a uniform amount of steam per pipe is supplied from the lower part outside the pipe filled with the filling material to the pipe surrounding area of each pipe, and the gas-liquid volume passing through each pipe surrounding area is supplied. Is maintained constant, and gas-liquid contact as designed is performed in the region around the tube where the packing layer is provided, so that desired distillation performance can be exhibited.
[0013]
Also, since the horizontal cross-sectional area of each pipe surrounding area can be made sufficiently small, it is not necessary to collect and redistribute in the middle between the tower top and the tower bottom, which leads to a complicated apparatus. Can be avoided.
In the internal heat exchange type distillation column of the present invention, a preferable packing to be disposed outside the tube includes a layered structure, and a regular packing in which each layered member is disposed to be substantially vertical. Although a thing etc. are illustrated, it is possible to use other various fillers.
Further, in the internal heat exchange type distillation column of the present invention, it is possible to adopt a structure in which the packing is filled in the tube, or a structure in which the packing is not filled. In addition, as a preferable filler when filling the tube with the filler, a structured filler or the like having a layered structure and each layered member is arranged so as to be substantially vertical is exemplified. It is also possible to use other packings.
[0014]
The internal heat exchange type distillation column according to claim 2 is characterized in that a horizontal cross-sectional shape of a region surrounded by the metal sheet is any one of a regular hexagon, a dodecagon, and a circle.
[0015]
By setting the horizontal cross-sectional shape of the region (periphery of the tube) surrounded by the thin metal plate to any one of a regular hexagon, a dodecagon, and a circle, an extra-tube region ( In addition, it is possible to form the area around the pipe, and it is possible to effectively use the space outside the pipe, thereby making it possible to make the present invention effective.
[0016]
Further, the internal heat exchange type distillation column according to claim 3 is characterized in that the inside of the plurality of tubes is also filled with packing.
[0017]
By adopting a structure in which the packing is filled inside the plurality of tubes, gas-liquid contact as intended in the tubes is performed in the tubes, so that more excellent distillation performance can be exhibited.
[0018]
Further, the internal heat exchange type distillation column according to claim 4 is characterized in that a space outside a region surrounded by the metal sheet is not used as a distillation section.
[0019]
The space outside the area surrounded by the metal sheet (ie, the space between each single tube unit and the space formed between the single tube unit and the inner wall of the main body) should not be used as the distillation section. By doing so, it becomes possible to easily form an extraluminal region having a horizontal cross-sectional shape (eg, regular hexagon, dodecagon, circular, etc.) in which the gas-liquid contact state is unlikely to be biased, and the present invention can be further effectively implemented. I can summarize it.
In this case, an area that does not become a distillation section is formed inside the main body, and the equipment becomes somewhat larger, but the horizontal cross-sectional area of the area that does not become the distillation section is The ratio to the cross-sectional area can be prevented from becoming so large, and the equipment does not become large enough to cause a practical problem.
[0020]
Further, the method for producing the internal heat exchange type distillation column of the present invention (claim 5) is as follows:
By connecting a plurality of pipes to the main body by the upper pipe sheet and the lower pipe sheet, the inside and outside of each pipe are isolated inside the main body, and the inside and outside of the pipes are respectively gas and liquid ports. With a structure with
The operating temperature is made different by making the operating pressure different between the inside and outside of the tube, and the heat is transferred from the high pressure side to the low pressure side by using the pipe wall of each tube as a heat transfer surface, so that the high pressure side is the concentrator and the low pressure side is A method for producing an internal heat exchange type distillation column configured to function as a recovery unit,
A filler layer is provided so as to surround the outer peripheral surface of the pipe, and the filler layer provided on the outer peripheral surface of the pipe is covered with a metal sheet, and a horizontal cross-sectional shape of a region surrounded by the metal sheet Pre-preparing a plurality of single tube units each being the same,
Installing the main body including the lower tube sheet in a predetermined position,
Arranging the plurality of single tube units in the main body so as to engage with the lower tube sheet;
Connecting the plurality of tubes to the main body by attaching an upper tube sheet.
[0021]
A region in which a layer filled with a filler (filler layer) is provided on the outer peripheral side of the pipe, and the filler layer provided on the outer peripheral surface of the pipe is covered with a metal sheet, and is surrounded by the metal sheet. Prepare a plurality of single tube units, each having the same horizontal cross-sectional shape, and after mounting the main body including the lower tube sheet at a predetermined position, the plurality of single tube units are referred to as a lower tube sheet. The internal heat exchange type distillation column is disposed inside the main body so as to engage with each other, and thereafter, the upper tube sheet is attached, and the plurality of tubes and the main body are connected to simplify the manufacturing process and efficiently perform the internal heat exchange type distillation column. Can be manufactured.
Further, in the internal heat exchange type distillation column of the present invention, the quality of the assembly of the contact portion between the outer peripheral surface of the tube and the packing layer is a major factor that governs the heat exchange performance. When this portion is assembled in advance as a single tube unit, the contact state between the outer peripheral surface of the tube and the packing layer can be improved, and sufficient heat exchange performance can be secured. Can be made effective.
[0022]
In a sixth aspect of the present invention, in the method for manufacturing an internal heat exchange distillation column, a single tube unit having a structure in which a filling is filled in the tube is used as the single tube unit.
[0023]
By using a single-pipe unit having a structure in which the packing is filled inside the pipe as a single-pipe unit, the gas-liquid as designed can be achieved both inside and outside the pipe as a packed tower inside the pipe. Contact can be performed, and an internal heat exchange type distillation column exhibiting excellent distillation performance can be efficiently manufactured without requiring a complicated manufacturing process.
[0024]
In the method for manufacturing an internal heat exchange distillation column according to claim 7, the horizontal sectional shape of the region surrounded by the thin metal plate is any one of a regular hexagon, a dodecagon, and a circle as the single tube unit. It is characterized by using a single tube unit.
[0025]
By using a single tube unit in which the horizontal cross-sectional shape of the area surrounded by the thin metal plate is one of a regular hexagon, a dodecagon, and a circle, the gas-liquid contact state is biased. It is possible to efficiently manufacture an internal heat exchange type distillation column having an outer tube region (a tube peripheral region) having a difficult planar shape, and the present invention can be made effective.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described, and features thereof will be described in detail.
[0027]
FIG. 1 is a front sectional view schematically showing a configuration of a main part of an internal heat exchange type distillation column according to an embodiment of the present invention, and FIG. 2 is a plan sectional view.
This internal heat exchange type distillation column is formed by connecting the main body 1 and the plurality of tubes 25 inserted into the main body 1 to the main body 1 by the upper tube sheet 3a and the lower tube sheet 3b. . The inside 4 and the outside 5 of each tube 25 have a structure isolated from each other, and the inside 4 is a high-pressure side enrichment section, and the outside 5 is a low-pressure side recovery section. I have.
[0028]
In addition, in the upper part of the main body 1, there are provided a collecting section liquid inlet 6 for supplying liquid to the outside of the pipe (collecting section) 5, and a collecting section steam outlet 7 for extracting vapor from the outside of the pipe (collecting section) 5. In the end chamber 14a above the upper tube sheet 3a and communicating with the inside of the tube (concentrating unit) 4, a liquid inlet 8 for the concentrating unit for supplying a liquid to the inside of the tube (concentrating unit) 4 is provided. In addition, a vapor outlet 9 for the concentrating section for extracting vapor from the pipe (concentrating section) 4 is provided.
[0029]
On the other hand, in the lower part of the main body 1, a recovery section steam inlet 10 for supplying steam to the outside (recovery section) 5 and a recovery section liquid outlet 11 for extracting liquid from the outside of the pipe (recovery section) 5 are provided. In the end chamber 14b below the lower tube sheet 3b and communicating with the inside of the tube (concentrating unit) 4, a steam inlet 12 for supplying steam to the inside of the tube (concentrating unit) 4 is provided. In addition, a liquid outlet 13 for concentrating part for extracting liquid from the tube (concentrating part) 4 is provided. The inside (concentrating unit) 4 and the outside (recovering unit) 5 of the tube are filled with packing materials (ordered packing materials) 4a and 5a.
[0030]
Then, in the internal heat exchange type distillation column of this embodiment, as shown in FIG. 2, a packing layer (ordered packing) 5 a is provided so as to wrap the outer peripheral surface of the tube 25, and By arranging a plurality of single tube units 30 having a structure in which the filler layer 5a provided on the outer peripheral surface is covered with the metal sheet 15 at a predetermined pitch inside the main body 1, Has a structure in which the inside 4 of each tube 25 and the outside 5 of each tube 25 are isolated, the packing layer 5a is disposed around each tube 25, and the metal sheet 15 of each single tube unit 30 The horizontal cross-sectional shape of the enclosed region (tube peripheral region) 16 is a regular hexagon, and the heat exchange structure A having the same shape is formed. Here, the horizontal cross-sectional shape of the pipe surrounding region 16 refers to the shape of a region surrounded by the thin metal plate 15 and including the outside 5 (filler layer 5a), the tube 25, and the inside 4 of the tube.
[0031]
In this internal heat exchange type distillation column, a space (outer peripheral region) 17 formed between the inner wall of the main body 1 and the outermost single tube unit 30 (30a), and each single tube unit 30 Gas (liquid) is not supplied to the space (gap) 18 formed between them (that is, it does not function as a distillation unit).
[0032]
In the internal heat exchange type distillation column of this embodiment configured as described above, the horizontal flow of the descending liquid and the rising vapor is interrupted by the metal sheet 15 surrounding the packing layer 5a, and flows down the outside of the tube 5. The range in which the liquid flows is limited to a region (region around the tube) 16 surrounded by the metal sheet 15. Further, the rising steam rises for each pipe surrounding area 16 with a uniform amount of descending liquid flowing down the pipe surrounding area 16 as a resistance. Therefore, a uniform amount of steam for each pipe is supplied to the pipe surrounding area 16 for each pipe from the lower part of the pipe 5 where the filler layer 5a is disposed.
[0033]
Therefore, the amount of gas-liquid passing through each pipe surrounding area 16 becomes the same (constant), and a desired gas-liquid contact is performed in the pipe surrounding area 16 where the packing layer 5a is disposed, thereby achieving a desired gas-liquid contact. It is possible to exhibit distillation performance.
In addition, since the horizontal cross-sectional area of each pipe surrounding region 16 can be made sufficiently small, it becomes unnecessary to perform liquid collection and redistribution on the way between the top and the bottom, which leads to a complicated apparatus. Can be avoided.
[0034]
The internal heat exchange type distillation column can be efficiently manufactured by a manufacturing method using a single tube unit, as described below.
(1) When manufacturing the internal heat exchange type distillation column as shown in FIGS. 1 and 2, the packing layer 5a is disposed so as to surround the outer peripheral surface of the tube 25, and the packing layer 5a is made of metal. A plurality of single tube units 30 each having a regular hexagonal cross section of a region (peripheral region around tube) 16 covered with the thin plate 15 and surrounded by the thin metal plate 15 are prepared in advance.
(2) Then, the main body 1 including the lower tube sheet 3b is installed at a predetermined position where the internal heat exchange type distillation column is to be installed.
(3) Next, a plurality of single tube units 30 are arranged in the main body 1 so as to engage with the lower tube sheet 3b.
(4) Then, the plurality of tubes 25 and the main body 1 are connected by attaching the upper tube sheet 3a.
[0035]
Through the above-described steps, the inside 4 and the outside 5 of each tube 25 are isolated inside the main body 1, and the filler layer 5 a is provided around each tube 25. It is possible to efficiently manufacture an internal heat exchange type distillation column provided with a heat exchange structure A in which the horizontal cross-sectional shape of the tube peripheral region 16 surrounded by the metal sheet 15 of the single tube unit 30 is a regular hexagon and the same. it can.
[0036]
In the internal heat exchange type distillation column of the present invention, the quality of the assembly of the contact portion between the outer peripheral surface of the pipe 25 and the packing layer 5a is directly related to the heat exchange performance. Is pre-assembled as a single tube unit 30, the contact state between the outer peripheral surface of the tube 25 and the filler layer 5a can be made good, and sufficient heat exchange performance can be secured. It becomes possible to make the invention effective.
[0037]
In the above-described embodiment, the case where the single tube unit 30 in which the horizontal cross-sectional shape of the region (the tube peripheral region) 16 surrounded by the thin metal plate 15 is a regular hexagon is used as an example has been described. As shown, it is also possible to use a single tube unit 30 in which the horizontal cross-sectional shape of the region (tube peripheral region) 16 surrounded by the thin metal plate 15 is circular, and further, as shown in FIG. It is also possible to use a single tube unit 30 in which the horizontal cross-sectional shape of a region (periphery of the tube) 16 surrounded by the thin metal plate 15 is a dodecagon. In FIGS. 3 and 4, portions denoted by the same reference numerals as those in FIG. 2 indicate the same or corresponding portions.
[0038]
Note that the shape of the pipe surrounding area is not limited to these, and it is also possible to use other shapes depending on the arrangement of the pipes and the like, and to use various shapes such as a square, an octagon, and the like. Is also possible.
[0039]
Further, in the above-described embodiment, the case where the outside of the tube is the recovery unit has been described as an example.However, it is also possible to apply to an internal heat exchange type distillation column configured so that the inside of the tube becomes the recovery unit. In this case, the same effect as in the above embodiment can be obtained.
[0040]
The present invention is not limited to the above embodiment in other respects, and various applications and modifications can be made within the scope of the present invention.
[0041]
【The invention's effect】
As described above, in the internal heat exchange type distillation column of the present invention (claim 1), the packing layer (the layer filled with the packing) is disposed so as to surround the outer peripheral surface of the tube. By disposing a plurality of single pipe units having a structure in which a filler layer disposed on the outer peripheral surface is covered with a metal sheet at a predetermined pitch inside the main body, The inside and outside of the pipe are isolated, and at least a packing layer is provided around each pipe, and the horizontal cross-sectional shape of the area surrounded by the metal sheet of each single pipe unit is the same. Since the heat exchange structure having the shape is formed, the horizontal flow of the descending liquid and the ascending vapor is blocked by the metal sheet surrounding the packing layer, and the flowing range of the liquid flowing down the outside of the pipe is controlled by the metal. Limited to the area surrounded by the thin plate (area around the pipe) DOO together is enabled, the rising vapor, the resistance uniform amount of liquid descending liquid flowing down the tube surrounding region, it becomes possible to increase each tube surrounding region.
Therefore, a uniform amount of steam per pipe is supplied from the lower part outside the pipe filled with the filling material to the pipe surrounding area of each pipe, and the gas-liquid volume passing through each pipe surrounding area is supplied. Is maintained constant, and gas-liquid contact as designed is performed in the region around the tube where the packing layer is provided, so that desired distillation performance can be exhibited.
[0042]
Also, since the horizontal cross-sectional area of each pipe surrounding area can be made sufficiently small, it is not necessary to collect and redistribute in the middle between the tower top and the tower bottom, which leads to a complicated apparatus. Can be avoided.
[0043]
Further, when the horizontal cross-sectional shape of the region (the tube surrounding region) surrounded by the thin metal plate is any one of a regular hexagon, a dodecagon, and a circle, as in the internal heat exchange type distillation column of claim 2, It is possible to form an extratubular region (peripheral region) having a planar shape in which the contact state is unlikely to be deviated, and it is possible to effectively utilize the extraluminal space, thereby making the present invention effective. It becomes possible.
[0044]
In addition, as in the internal heat exchange type distillation column according to the third aspect, a structure in which a plurality of tubes are filled with a packing material is provided, so that gas-liquid contact as intended is performed in the tubes. Thus, it is possible to exhibit more excellent distillation performance.
[0045]
Further, when the space outside the region surrounded by the thin metal plate is not used as the distillation portion as in the internal heat exchange type distillation column of claim 4, a horizontal cross-sectional shape in which the gas-liquid contact state is less likely to be biased ( For example, it is possible to easily form an extraluminal region having a regular hexagon, a dodecagon, a circle, etc.), so that the present invention can be made more effective.
In this case, an area that does not become a distillation section is formed inside the main body, and the equipment becomes somewhat larger, but the horizontal cross-sectional area of the area that does not become the distillation section is The ratio with respect to the cross-sectional area can be prevented from becoming so large, and the equipment does not become large enough to cause a practical problem.
[0046]
Further, according to the method for producing an internal heat exchange type distillation column of the present invention (claim 5), a layer filled with packing (packing layer) is provided on the outer peripheral side of the tube, and the outer peripheral surface of the tube is provided on the outer peripheral surface of the tube. A plurality of single-pipe units each having the same horizontal cross-sectional shape in a region surrounded by the metal sheet with the filling layer provided are provided, and a main body including the lower tube sheet is prepared. After being installed in a predetermined position, a plurality of single tube units are arranged in the main body so as to engage with the lower tube sheet, and then the upper tube sheet is attached, and a plurality of pipes and the main body Are connected, so that the production process can be simplified and the internal heat exchange type distillation column can be efficiently produced.
Further, in the internal heat exchange type distillation column of the present invention, the quality of the assembly of the contact portion between the outer peripheral surface of the tube and the packing layer is a major factor that governs the heat exchange performance. When this portion is assembled in advance as a single tube unit, the contact state between the outer peripheral surface of the tube and the packing layer can be improved, and sufficient heat exchange performance can be secured. Can be made effective.
[0047]
In a case where a single-tube unit having a structure in which the inside of the tube is filled with a packing is used as the single-tube unit as in the method for manufacturing an internal heat exchange distillation column according to claim 6, the inside of the tube Is a packed column, it is possible to perform gas-liquid contact as designed in the tube, the internal heat exchange type distillation column exhibiting excellent distillation performance, without complicating the manufacturing process, It becomes possible to manufacture efficiently.
[0048]
Further, as in the method for manufacturing the internal heat exchange type distillation column according to claim 7, the horizontal cross-sectional shape of the region surrounded by the thin metal plate is any one of a regular hexagon, a dodecagon, and a circle as a single tube unit. By using a single tube unit, it is possible to efficiently manufacture an internal heat exchange type distillation column having an outer tube region (a tube peripheral region) having a planar shape in which the gas-liquid contact state is less likely to be biased. That is, the present invention can be made more effective.
[Brief description of the drawings]
FIG. 1 is a front sectional view schematically showing a structure of a main part of an internal heat exchange type distillation column according to an embodiment of the present invention.
FIG. 2 is a plan sectional view showing the internal structure of an internal heat exchange distillation column according to one embodiment of the present invention.
FIG. 3 is a plan sectional view showing an internal heat exchange type distillation column using another single tube unit according to the embodiment of the present invention.
FIG. 4 is a plan sectional view showing another modified example of the single tube unit used for the internal heat exchange type distillation column of the present invention.
FIG. 5 is a diagram showing a configuration of a conventional internal heat exchange type distillation column to which the present invention relates.
[Explanation of symbols]
1 Body 3a Upper tube sheet 3b Lower tube sheet 4 Inside the tube (concentrating part)
4a Filling material arranged in pipe (ordered packing material)
5 Outside the tube (collection section)
5a Filling placed outside the pipe (regular filling)
Reference Signs List 6 Recovery part liquid inlet 7 Recovery part vapor outlet 8 Concentration part liquid inlet 9 Concentration part vapor outlet 10 Recovery part vapor inlet 11 Recovery part liquid outlet 12 Concentration part vapor inlet 13 Concentration part liquid outlets 14a, 14b End chamber 15 Metal sheet 16 Tube Peripheral region 17 Outer peripheral region 18 Space not surrounding the tube 25 Tube 30 Single tube unit 30a Outermost single tube unit A Heat exchange structure

Claims (7)

By connecting a plurality of pipes to the main body by means of both end pipe sheets, the inside and outside of each pipe are isolated inside the main body, and each of the inside and outside of the pipe has a gas-liquid inlet / outlet. Along with
The operating temperature is made different by making the operating pressure different between the inside and outside of the tube, and the heat is transferred from the high pressure side to the low pressure side with the pipe wall of each pipe as the heat transfer surface, so that the high pressure side is the concentrator and the low pressure side is An internal heat exchange distillation column configured to function as a recovery unit,
A filler layer is provided so as to surround an outer peripheral surface of a pipe constituting the plurality of pipes, and the filler layer disposed on an outer peripheral face of the pipe is covered with a metal sheet. Are arranged inside the main body at a predetermined pitch, so that the inside and outside of each pipe are isolated inside the main body, and at least a packing layer is provided around each pipe. And an internal heat exchange type distillation column characterized in that a heat exchange structure having the same horizontal cross-sectional shape in a region surrounded by a metal sheet of each single tube unit is formed. . The internal heat exchange type distillation column according to claim 1, wherein a horizontal cross-sectional shape of the region surrounded by the metal sheet is any one of a regular hexagon, a dodecagon, and a circle. The internal heat exchange type distillation column according to claim 1, wherein a packing is filled inside the plurality of tubes. The internal heat exchange type distillation column according to any one of claims 1 to 3, wherein a space outside a region surrounded by the metal sheet is not used as a distillation unit. By connecting a plurality of tubes to the main body by the upper tube sheet and the lower tube sheet, the inside and outside of each tube are isolated inside the main body, and each of the inside and outside of the tube is a gas-liquid inlet / outlet. With a structure with
The operating temperature is made different by making the operating pressure different between the inside and outside of the tube, and the heat is transferred from the high pressure side to the low pressure side with the pipe wall of each pipe as the heat transfer surface, so that the high pressure side is the concentrator and the low pressure A method for producing an internal heat exchange type distillation column configured to function as a recovery unit,
A filler layer is provided so as to surround the outer peripheral surface of the pipe, and the filler layer provided on the outer peripheral surface of the pipe is covered with a metal sheet, and a horizontal cross-sectional shape of a region surrounded by the metal sheet Pre-preparing a plurality of single tube units each being the same,
Installing the main body including the lower tube sheet in a predetermined position,
Disposing the plurality of single tube units in the main body so as to engage with the lower tube sheet;
Connecting the plurality of tubes and the main body body by attaching an upper tube sheet to the internal heat exchange type distillation column. The method for producing an internal heat exchange type distillation column according to claim 5, wherein a single tube unit having a structure in which a filling is filled in the tube is used as the single tube unit. 7. The single tube unit according to claim 5, wherein a horizontal section of a region surrounded by the thin metal plate is one of a regular hexagon, a dodecagon, and a circle. A method for producing the internal heat exchange type distillation column according to the above.

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