JP3990203B2 - Internal heat exchange distillation column and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention comprises an internal heat exchange distillation column that includes a low pressure column and a high pressure column, and performs heat exchange between the two by performing heat transfer from the high pressure column (concentration unit) side to the low pressure column (recovery unit) side. It relates to a manufacturing method.
[0002]
[Prior art and problems to be solved by the invention]
As an distillation column that excels in energy conservation, a low-pressure column and a high-pressure column are configured to exchange heat between them, and an internal heat exchange type distillation column that does not require heat exchange with others is known. It has been. From the standpoint of promoting energy saving in distillation operation, this internal heat exchange distillation column is of course the principle that is most faithful to energy saving, and it is recognized from the academic viewpoint. By the way.
[0003]
In addition, as an internal heat exchange type distillation column, a plurality of tubes are connected to the main body cylinder by both end tube plates so that the inside and outside of each pipe are separated from each other inside the main body cylinder. Each is provided with a gas-liquid inlet / outlet, and the operating temperature is varied by making a difference in the operating pressure between the inside and outside of the pipe, and the pipe wall of each pipe is used as a heat transfer surface to transfer heat from the high pressure side to the low pressure side Thus, there has been proposed a structure in which one distillation column is configured with the high-pressure side as the concentrating section and the low-pressure side as the recovery section (Japanese Patent Laid-Open No. 8-66601 (Japanese Patent No. 2694425)).
[0004]
As shown in FIG. 5, this internal heat exchange distillation column includes a main body cylinder 1 and a plurality of tubes 25 inserted into the main body cylinder 1, with both end tube sheets (upper tube sheet (top-side tube sheet) 3 a and It is formed by connecting with the main body cylinder 1 by a lower tube sheet (a tower bottom tube sheet) 3b). The inner pipe 4 and the outer pipe 5 of each pipe 25 are separated from each other. The inner pipe 4 serves as a high pressure side concentrating part, and the outer pipe 5 serves as a low pressure side collecting part. Yes.
[0005]
In addition, a recovery unit liquid inlet 6 for supplying a liquid to the outside of the tube (collection unit) 5 and a recovery unit steam outlet 7 for extracting steam from the outside of the tube (collection unit) 5 are disposed at the top of the main body barrel 1. A concentrating section liquid inlet 8 for supplying a liquid to the inside of the pipe (concentrating section) 4 is disposed in the end chamber 14a that communicates with the inside of the pipe (concentrating section) 4 above the upper tube plate 3a. Further, a concentrating part steam outlet 9 for extracting steam from the inside of the pipe (concentrating part) 4 is provided.
[0006]
On the other hand, a recovery unit steam inlet 10 for supplying steam to the outside of the tube (recovery unit) 5 and a recovery unit liquid outlet 11 for extracting the liquid from the outside of the tube (collection unit) 5 are disposed at the lower part of the main body barrel 1. The concentrating section steam inlet 12 for supplying steam to the inside of the pipe (concentrating section) 4 is disposed in the end chamber 14b communicating with the inside of the pipe (concentrating section) 4 below the lower tube plate 3b. In addition, a concentration unit liquid outlet 13 for extracting the liquid from the pipe (concentration unit) 4 is provided.
[0007]
By the way, in such an internal heat exchange type distillation column, since the state of gas-liquid contact in the distillation part inside and outside the pipe constituting the concentrating part or the recovery part greatly affects the distillation action, for example, As in the case of the internal heat exchange distillation column in FIG. 5, in the case where the collection unit (packed column) is filled with a packing outside the tube, and the gas-liquid flow is uneven, the target is The distillation effect cannot be obtained.
That is, the liquid sprayed evenly per surface area on the top of the packed bed at the top of the packed tower flows down the packed surface by attractive force, and the steam supplied to the bottom of the tower creates a pressure difference between the top and bottom of the tower. Distillation is carried out by raising the gap between the packings as a driving force and bringing the liquid and steam into contact with each other in the packed tower. Since there is a tendency to flow to a small place and the descending liquid flows to a place where the amount of the rising steam is small, a slight drift causes a large drift in an accelerated manner. Therefore, the positional deviation of the ratio between the descending liquid amount and the ascending steam amount increases from the tower top to the tower bottom, and as a result, the designed gas-liquid contact effect, 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 (generally depending on the tower diameter, but generally every 2 to 5 m). A liquid tool, a liquid dispersing tool, etc. are arranged so that the gas-liquid contact effect as designed can be obtained. However, in such a configuration, not only the equipment structure is complicated, but also the space in which the packed bed receiver, the liquid collecting tool, the liquid dispersing tool and the like are disposed does not function as a distillation unit that performs a distillation action. For this reason, there is a problem in that the height of the distillation column is increased by that amount, resulting in an increase in equipment size and cost.
[0009]
In addition, when a packed column is packed outside the tube, the horizontal cross-sectional shape outside the tube is complicated, and the gas-liquid contact state is likely to be biased. The problem due to (1) becomes more prominent, and it tends to be more difficult to make the gas-liquid contact state per unit area on the horizontal section uniform.
[0010]
The present invention solves the above-mentioned problems, and is an internal heat exchange type capable of exhibiting the target distillation performance with little bias in the gas-liquid contact state in the distillation section without incurring an increase in cost. It aims at providing a distillation column and its manufacturing method.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the internal heat exchange distillation column of the present invention (Claim 1)
A structure in which a plurality of tubes are connected to the main body cylinder by both end tube plates, so that the inside and outside of each pipe are separated from each other inside the main body cylinder, and each of the inside and outside of the pipe has a gas-liquid inlet and outlet. And
By differentiating the operating pressure between the inside and outside of the pipe, the operating temperature is varied, and the pipe wall of each pipe is used as a heat transfer surface to transfer heat from the high-pressure side to the low-pressure side. An internal heat exchange distillation column configured to function as a recovery unit,
A plurality of structures having a structure in which a filler layer is disposed so as to surround an outer peripheral surface of a tube constituting the plurality of tubes, and the filler layer disposed on the outer peripheral surface of the tube is covered with a thin metal plate. The single tube unit is disposed inside the main body cylinder at a predetermined pitch, so that the inside and the outside of each pipe are separated from each other inside the main body cylinder, and at least the packing layer around each pipe And a heat exchange structure having the same horizontal cross-sectional shape in the region surrounded by the thin metal plate of each single tube unit.
[0012]
A filler layer (a layer filled with a filler) is disposed so as to surround the outer peripheral surface of the tube, and the filler layer disposed on the outer peripheral surface of the tube is covered with a thin metal plate. A plurality of single pipe units are arranged inside the main body cylinder at a predetermined pitch, the inside and outside of each pipe are isolated from each other inside the main body cylinder, and at least a filler layer is provided around each pipe. By forming a heat exchange structure in which the horizontal cross-sectional shape of the region surrounded by the thin metal plate of each single tube unit has the same shape, the descending liquid and the rising steam in the horizontal direction are formed. The flow is blocked by a thin metal plate surrounding the packing layer, and the range of the liquid flowing down the tube can be limited to the region surrounded by the thin metal plate (region surrounding the tube). Uniform liquid flow down the area around the tube As the resistance, it is possible to raise each tube surrounding region.
Therefore, a uniform amount of vapor is supplied from the lower part outside the tube filled with the filling to each tube surrounding region for each tube, and the amount of gas and liquid passing through each tube surrounding region. The gas-liquid contact according to the target design is performed in the region around the pipe where the packing layer is disposed, and the desired distillation performance can be exhibited.
[0013]
In addition, since the horizontal cross-sectional area of the surrounding area of each pipe can be made sufficiently small, it is not necessary to collect and redistribute in the middle between the tower top and the tower bottom, resulting in complicated equipment. It can be avoided.
In the internal heat exchange distillation column of the present invention, suitable packing disposed outside the tube has a layered structure, and regular packing in which each layered member is disposed substantially vertically. Although various things etc. are illustrated, it is possible to use other various filling materials.
Further, the internal heat exchange distillation column of the present invention can have a structure in which the packing is filled in the tube, or can have a structure in which the packing is not filled. In addition, as a suitable filling when filling a tube with a filling material, there is exemplified a regular filling material having a layered structure and arranged so that each layered member is substantially vertically oriented. It is also possible to use other fillers.
[0014]
The internal heat exchange distillation column of claim 2 is characterized in that the horizontal cross-sectional shape of the region surrounded by the metal thin plate is any one of a regular hexagon, a dodecagon, and a circle.
[0015]
By setting the horizontal sectional shape of the region surrounded by the thin metal plate (region surrounding the tube) to one of a regular hexagon, a dodecagon, and a circle, a region outside the tube having a planar shape that is less likely to be biased in the gas-liquid contact state ( It is possible to form an area around the tube), and to effectively use the space outside the tube, which makes it possible to effectively present the present invention.
[0016]
The internal heat exchange distillation column according to claim 3 is characterized in that the inside of the plurality of tubes is also filled with a packing.
[0017]
By adopting a structure in which the inside of a plurality of tubes is filled with a packing material, it becomes possible to perform gas-liquid contact as designed in the tubes and to exhibit further superior distillation performance.
[0018]
The internal heat exchange distillation column according to claim 4 is characterized in that a space outside the region surrounded by the metal thin plate is not used as a distillation part.
[0019]
Do not use the space outside the area surrounded by the thin metal plate (that is, the gap between each single tube unit or the space formed between the single tube unit and the inner wall of the main body) as a distillation section. By doing so, it becomes possible to easily form a region outside the tube having a horizontal cross-sectional shape (for example, a regular hexagon, a dodecagon, a circle, etc.) that is less likely to cause a bias in the gas-liquid contact state. It can be announced.
In this case, an area that does not become a distillation part is formed inside the main body cylinder, and the equipment is somewhat increased in size, but the horizontal cross-sectional area of the area that does not become a distillation part is horizontal in the main body cylinder. It is possible to prevent the ratio of the cross-sectional area from becoming so large, and the size of the equipment is not increased so as to cause a practical problem.
[0020]
Moreover, the manufacturing method of the internal heat exchange distillation column of the present invention (Claim 5),
By connecting a plurality of tubes to the main body cylinder by means of an upper tube plate and a lower tube plate, the inside and outside of each tube are separated from each other inside the main body cylinder, and the inside and outside of the tubes are gas liquid inlets and outlets, respectively. And a structure with
By differentiating the operating pressure between the inside and outside of the pipe, the operating temperature is varied, and the pipe wall of each pipe is used as a heat transfer surface to transfer heat from the high-pressure side to the low-pressure side. A method for producing an internal heat exchange distillation column configured to function as a recovery unit,
A horizontal cross-sectional shape of a region in which a filler layer is disposed so as to surround the outer peripheral surface of the tube, and the filler layer disposed on the outer peripheral surface of the tube is covered with a thin metal plate and surrounded by the thin metal plate Preparing a plurality of single tube units, each of which is the same,
Installing the main body cylinder including the lower tube sheet in place;
Disposing the plurality of single tube units in a body barrel so as to engage with the lower tube plate;
A step of connecting the plurality of tubes and the main body barrel by attaching an upper tube sheet.
[0021]
A region where a layer filled with a filler (filler layer) is disposed on the outer peripheral side of the tube, and the filler layer disposed on the outer peripheral surface of the tube is covered with a metal thin plate and surrounded by the metal thin plate After preparing a plurality of single tube units each having the same horizontal cross-sectional shape and installing the main body cylinder including the lower tube plate in a predetermined position, the plurality of single tube units are connected to the lower tube plate. It is arranged in the main body so as to engage, and then an upper tube plate is attached, and a plurality of pipes and the main body are connected to simplify the manufacturing process and efficiently use the internal heat exchange distillation column. Can be manufactured.
Further, in the internal heat exchange 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 packed bed is a major factor governing the heat exchange performance. When this part is pre-assembled as a single tube unit, the contact state between the outer peripheral surface of the tube and the filler layer is good, and sufficient heat exchange performance can be ensured. Can be effectively realized.
[0022]
The method for producing an internal heat exchange distillation column according to claim 6 is characterized in that a single tube unit having a structure in which a packing is filled inside the tube is used as the single tube unit.
[0023]
By using a single tube unit having a structure in which the inside of the tube is filled with a packing as a single tube unit, the gas and liquid as designed in the target both inside and outside the tube as a packed tower. It is possible to make contact, and it is possible to efficiently produce an internal heat exchange distillation column that exhibits excellent distillation performance without requiring a complicated production process.
[0024]
Moreover, the manufacturing method of the internal heat exchange type | mold distillation column of Claim 7 WHEREIN: As said single tube unit, the horizontal cross-sectional shape of the area | region enclosed by the metal thin plate is a regular hexagon, a dodecagon, and a circle. It is characterized by using a single tube unit.
[0025]
As a single tube unit, the use of a single tube unit in which 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 causes a bias in the gas-liquid contact state. It becomes possible to efficiently produce an internal heat exchange distillation column having an outside tube region (tube surrounding region) having a difficult planar shape, and the present invention can be effectively realized.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be shown and features thereof will be described in detail.
[0027]
FIG. 1 is a front sectional view schematically showing the configuration of the main part of an internal heat exchange distillation column according to an embodiment of the present invention, and FIG. 2 is a plan sectional view.
This internal heat exchange distillation column is formed by connecting the main body cylinder 1 and a plurality of tubes 25 inserted into the main body cylinder 1 to the main body cylinder 1 by the upper tube plate 3a and the lower tube plate 3b. . The inner pipe 4 and the outer pipe 5 of each pipe 25 are separated from each other. The inner pipe 4 serves as a high pressure side concentrating part, and the outer pipe 5 serves as a low pressure side collecting part. Yes.
[0028]
In addition, a recovery unit liquid inlet 6 for supplying a liquid to the outside of the tube (collection unit) 5 and a recovery unit steam outlet 7 for extracting steam from the outside of the tube (collection unit) 5 are disposed at the top of the main body barrel 1. A concentrating section liquid inlet 8 for supplying a liquid to the inside of the pipe (concentrating section) 4 is disposed in the end chamber 14a that communicates with the inside of the pipe (concentrating section) 4 above the upper tube plate 3a. Further, a concentrating part steam outlet 9 for extracting steam from the inside of the pipe (concentrating part) 4 is provided.
[0029]
On the other hand, a recovery unit steam inlet 10 for supplying steam to the outside of the tube (recovery unit) 5 and a recovery unit liquid outlet 11 for extracting the liquid from the outside of the tube (collection unit) 5 are disposed at the lower part of the main body barrel 1. The concentrating section steam inlet 12 for supplying steam to the inside of the pipe (concentrating section) 4 is disposed in the end chamber 14b communicating with the inside of the pipe (concentrating section) 4 below the lower tube plate 3b. In addition, a concentration unit liquid outlet 13 for extracting the liquid from the pipe (concentration unit) 4 is provided. Further, the inside of the tube (concentrating portion) 4 and the outside of the tube (collecting portion) 5 are filled with fillers (regular fillers) 4a and 5a.
[0030]
In the internal heat exchange distillation column of this embodiment, as shown in FIG. 2, a packing layer (regular packing) 5 a is disposed so as to wrap around the outer peripheral surface of the tube 25, and By disposing a plurality of single tube units 30 having a structure in which the filler layer 5a disposed on the outer peripheral surface is covered with the metal thin plate 15 inside the main body cylinder 1 at a predetermined pitch, The inside 4 and the outside 5 of each tube 25 are isolated from each other, and a filler layer 5a is disposed around each tube 25, and by the metal thin plate 15 of each single tube unit 30 The horizontal cross-sectional shape of the enclosed region (tube surrounding 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 tube surrounding region 16 refers to the shape of the region including the outer tube 5 (filler layer 5a), the tube 25, and the tube tube 4 surrounded by the thin metal plate 15.
[0031]
In this internal heat exchange distillation column, the space (outer peripheral area) 17 formed between the inner wall of the main body 1 and the outermost single pipe unit 30 (30a), and each single pipe unit 30 It is configured so that gas and liquid are not supplied to the space (gap) 18 formed between them (that is, it does not function as a distillation section).
[0032]
In the internal heat exchange distillation column of this embodiment configured as described above, the horizontal flow of the descending liquid and the rising steam is blocked by the metal thin plate 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 (tube surrounding region) 16 surrounded by the thin metal plate 15. Further, the rising steam rises for each tube surrounding region 16 by using the descending liquid of a uniform liquid amount flowing down the tube surrounding region 16 as a resistance. Therefore, a uniform amount of steam is supplied from the lower portion of the outer tube 5 where the filler layer 5a is disposed to the tube surrounding region 16 for each tube.
[0033]
Accordingly, the amount of gas and liquid passing through each tube surrounding region 16 is the same (constant), and the desired gas-liquid contact is performed in the tube surrounding region 16 in which the filler layer 5a is disposed, as desired. The distillation performance can be exhibited.
In addition, since the horizontal cross-sectional area of each tube surrounding area 16 can be made sufficiently small, it is not necessary to collect and redistribute in the middle between the tower top and the tower bottom, resulting in complicated equipment. You can avoid that.
[0034]
The internal heat exchange distillation column can be efficiently manufactured by a manufacturing method using a single tube unit, as will be described below.
(1) In manufacturing the internal heat exchange 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 horizontal cross-sectional shape in a region (tube surrounding region) 16 covered with the thin plate 15 and surrounded by the thin metal plate 15 are prepared in advance.
(2) Then, the main body cylinder 1 including the lower tube sheet 3b is installed at a predetermined position where the internal heat exchange distillation column is to be installed.
(3) Next, the plurality of single tube units 30 are disposed in the main body cylinder 1 so as to engage with the lower tube plate 3b.
(4) Thereafter, the upper tube sheet 3a is attached to connect the plurality of tubes 25 and the main body cylinder 1.
[0035]
Through the above-described steps, the inside 4 and the outside 5 of each tube 25 are isolated inside the main body barrel 1, and the filler layer 5 a is disposed around each tube 25. It is possible to efficiently produce an internal heat exchange distillation column having a heat exchange structure A in which the horizontal cross-sectional shape of the tube surrounding region 16 surrounded by the thin metal plate 15 of the single tube unit 30 is a regular hexagon. it can.
[0036]
In the internal heat exchange distillation column of the present invention, the quality of the assembly between the outer peripheral surface of the tube 25 and the contact portion of the packed bed 5a is directly related to the heat exchange performance. Is assembled as a single tube unit 30 in advance, 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 ensured. It becomes possible to make the invention effective.
[0037]
In the above embodiment, the case where the single tube unit 30 in which the horizontal cross-sectional shape of the region (tube surrounding region) 16 surrounded by the thin metal plate 15 is a regular hexagon is used as an example is shown in FIG. As shown, it is 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 the region (tube surrounding region) 16 surrounded by the thin metal plate 15 is a dodecagon. 3 and 4, the parts denoted by the same reference numerals as those in FIG. 2 indicate the same or corresponding parts.
[0038]
The shape of the tube surrounding area is not limited to these, and other shapes may be used depending on the arrangement form of the tube, such as a square, an octagon, and other various shapes. Is also possible.
[0039]
In the above embodiment, the case where the outside of the tube is the recovery unit has been described as an example, but the present invention can also be applied to an internal heat exchange distillation column configured so that the inside of the tube becomes the recovery unit. Even in this case, it is possible to obtain the same effect as in the above embodiment.
[0040]
The present invention is not limited to the above embodiment in other points, and various applications and modifications can be made within the scope of the invention.
[0041]
【The invention's effect】
As described above, in the internal heat exchange distillation column of the present invention (Claim 1), the packing layer (layer filled with packing) is disposed so as to surround the outer peripheral surface of the tube, and the tube A plurality of single tube units having a structure in which a filler layer disposed on the outer peripheral surface of the main body is covered with a thin metal plate are disposed at a predetermined pitch inside the main body cylinder so that The inside and outside of the tube are separated from each other, and a packing layer is disposed at least around each tube, and the horizontal sectional shape of the region surrounded by the metal thin plate of each single tube unit is the same. Since the heat exchange structure having a shape is formed, the horizontal flow of the descending liquid and the rising steam is blocked by the thin metal plate surrounding the packing layer, and the range of the liquid flowing down the tube flows through the metal. Limited to the area surrounded by the thin plate (area surrounding the tube) 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 vapor is supplied from the lower part outside the tube filled with the filling to each tube surrounding region for each tube, and the amount of gas and liquid passing through each tube surrounding region. The gas-liquid contact according to the target design is performed in the region around the pipe where the packing layer is disposed, and the desired distillation performance can be exhibited.
[0042]
In addition, since the horizontal cross-sectional area of the surrounding area of each pipe can be made sufficiently small, it is not necessary to collect and redistribute in the middle between the tower top and the tower bottom, resulting in complicated equipment. It can be avoided.
[0043]
In addition, as in the internal heat exchange distillation column of claim 2, when the horizontal cross-sectional shape of the region surrounded by the thin metal plate (region surrounding the tube) is any one of a regular hexagon, a dodecagon, and a circle, It is possible to form a tube outer region (tube peripheral region) having a planar shape in which the contact state is less likely to be biased, and it is possible to effectively use a space outside the tube, thus effectively presenting the present invention. It becomes possible.
[0044]
Further, as in the internal heat exchange type distillation column of claim 3, by making the structure in which the packing is filled also inside the plurality of tubes, the gas-liquid contact as the target design is performed in the tubes. Therefore, it becomes possible to exhibit further superior distillation performance.
[0045]
Further, as in the internal heat exchange distillation column of claim 4, when the space outside the region surrounded by the metal thin plate is not used as a distillation part, 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 a region outside the tube having a regular hexagonal shape, a dodecagonal shape, a circular shape, etc., and the present invention can be further effectively realized.
In this case, an area that does not become a distillation part is formed inside the main body cylinder, and the equipment is somewhat increased in size, but the horizontal cross-sectional area of the area that does not become a distillation part is horizontal in the main body cylinder. It is possible to prevent the ratio of the cross-sectional area from becoming so large, and the size of the equipment is not increased so as to cause a practical problem.
[0046]
Further, in the method for manufacturing an internal heat exchange distillation column of the present invention (Claim 5), a layer (packed layer) filled with a filler is disposed on the outer peripheral side of the tube, and the outer peripheral surface of the tube is provided. A main body cylinder including a lower tube plate is prepared by preparing a plurality of single tube units in which the disposed filler layer is covered with a thin metal plate and the horizontal cross-sectional shape of the region surrounded by the thin metal plate is the same. Are installed in the main body cylinder so as to be engaged with the lower tube sheet, and then the upper tube sheet is attached to the plurality of tubes and the main body cylinder. Therefore, it is possible to simplify the manufacturing process and efficiently manufacture the internal heat exchange distillation column.
Further, in the internal heat exchange 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 packed bed is a major factor governing the heat exchange performance. When this part is pre-assembled as a single tube unit, the contact state between the outer peripheral surface of the tube and the filler layer is good, and sufficient heat exchange performance can be ensured. Can be effectively realized.
[0047]
Further, as in the method for producing an internal heat exchange distillation column according to claim 6, when a single tube unit having a structure in which the inside of the tube is filled is used as the single tube unit, Is a packed column that can perform gas-liquid contact as designed in the pipe, and exhibits an excellent distillation performance without complicating the production process. It becomes possible to manufacture efficiently.
[0048]
Further, as in the method for manufacturing an internal heat exchange distillation column according to claim 7, the horizontal cross-sectional shape of the region surrounded by the metal thin plate as a single tube unit is any one of a regular hexagon, a dodecagon, and a circle. By using a single tube unit, it is possible to efficiently manufacture an internal heat exchange distillation column having an outer region (outer tube region) having a planar shape that is less likely to cause a bias in the gas-liquid contact state. Thus, the present invention can be further effectively realized.
[Brief description of the drawings]
FIG. 1 is a front sectional view schematically showing the structure of the main part of an internal heat exchange distillation column according to an embodiment of the present invention.
FIG. 2 is a plan sectional view showing an internal structure of an internal heat exchange distillation column according to an embodiment of the present invention.
FIG. 3 is a plan sectional view showing an internal heat exchange distillation column using another single tube unit according to an embodiment of the present invention.
FIG. 4 is a plan sectional view showing another modification of the single tube unit used in the internal heat exchange distillation column of the present invention.
FIG. 5 is a diagram showing the configuration of a conventional internal heat exchange distillation column to which the present invention relates.
[Explanation of symbols]
1 Body trunk 3a Upper tube plate 3b Lower tube plate 4 Inside the tube (concentration part)
4a Filler disposed in the pipe (regular filler)
5 Outside the tube (collection unit)
5a Packing outside the pipe (regular packing)
6 Recovery part liquid inlet 7 Recovery part steam outlet 8 Concentration part liquid inlet 9 Concentration part steam outlet 10 Recovery part steam inlet 11 Recovery part liquid outlet 12 Concentration part steam inlet 13 Concentration part liquid outlets 14a and 14b End chamber 15 Metal thin plate 16 Tube Surrounding region 17 Outer peripheral region 18 Space 25 that does not surround the tube 25 Tube 30 Single tube unit 30a Outermost single tube unit A Heat exchange structure

Claims (7)

A structure in which a plurality of tubes are connected to the main body cylinder by both end tube plates, so that the inside and outside of each pipe are separated from each other inside the main body cylinder, and each of the inside and outside of the pipe has a gas-liquid inlet and outlet. And
By differentiating the operating pressure between the inside and outside of the pipe, the operating temperature is varied, and the pipe wall of each pipe is used as a heat transfer surface to transfer heat from the high-pressure side to the low-pressure side. An internal heat exchange distillation column configured to function as a recovery unit,
A plurality of structures having a structure in which a filler layer is disposed so as to surround an outer peripheral surface of a tube constituting the plurality of tubes, and the filler layer disposed on the outer peripheral surface of the tube is covered with a thin metal plate. The single tube unit is disposed inside the main body cylinder at a predetermined pitch, so that the inside and the outside of each pipe are separated from each other inside the main body cylinder, and at least the packing layer around each pipe And a heat exchange structure having the same horizontal cross-sectional shape in the region surrounded by the thin metal plate of each single tube unit is formed. . 2. The internal heat exchange distillation column according to claim 1, wherein a horizontal cross-sectional shape of the region surrounded by the metal thin plate is any one of a regular hexagon, a dodecagon, and a circle. The internal heat exchange distillation column according to claim 1 or 2, wherein a packing is filled in the plurality of tubes. The internal heat exchange distillation column according to any one of claims 1 to 3, wherein a space outside the region surrounded by the metal thin plate is not used as a distillation section. By connecting a plurality of tubes to the main body cylinder by means of an upper tube plate and a lower tube plate, the inside and outside of each tube are separated from each other inside the main body cylinder, and the inside and outside of the tubes are gas liquid inlets and outlets, respectively. And a structure with
By differentiating the operating pressure between the inside and outside of the pipe, the operating temperature is varied, and the pipe wall of each pipe is used as a heat transfer surface to transfer heat from the high-pressure side to the low-pressure side. A method for producing an internal heat exchange distillation column configured to function as a recovery unit,
A horizontal cross-sectional shape of a region in which a filler layer is disposed so as to surround the outer peripheral surface of the tube, and the filler layer disposed on the outer peripheral surface of the tube is covered with a thin metal plate and surrounded by the thin metal plate Preparing a plurality of single tube units, each of which is the same,
Installing the main body cylinder including the lower tube sheet in place;
Disposing the plurality of single tube units in a body barrel so as to engage with the lower tube plate;
A method for producing an internal heat exchange distillation column, comprising a step of connecting the plurality of tubes and the main body cylinder by attaching an upper tube sheet. 6. The method for producing an internal heat exchange distillation column according to claim 5, wherein the single tube unit is a single tube unit having a structure in which a packing is filled inside the tube. The single tube unit is a single tube unit in which 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. A method for producing the internal heat exchange distillation column as described.

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