JPH09313802A - Rectifying column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rectifying column having a regenerator whose volume is small and whose manufacturing cost is low. SOLUTION: A rectifying column body is provided with a regenerator, and a stripping section and an enriching section in the lower part and above it respectively. The regenerator is constituted of a plate heat exchanger 2 in which plural heat transfer plate members 24 in which each a feed path 23 for heating steam is formed are arranged at fixed intervals. Above the heat transfer plate members 24, a dispersing plate 31 in which many dispersing holes 32 are made and also which is formed into a recessed and projection part whose section has the corrugated shape is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectification column for carrying out a distillation operation of substances such as petroleum, alcohol and benzene, and more particularly to a regenerator provided under the rectification column.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Is a rectification column main body 106 in which a shell-and-tube regenerator (referred to as a reboiler) 103 in which a heating steam pipe 102 is inserted is provided in the lower portion, and a recovery unit 104 and a concentration unit 105 are provided in the upper portion thereof. And a stock solution supply pipe 107 that is connected between the recovery section 104 and the concentrating section 105 of the rectification tower body 106 to supply the stock solution, and the gas of the stock solution is taken out from the top of the rectification tower body 106 and A condenser 108 is provided, and further this condenser 1
It is composed of a distillate withdrawing pipe section 110 provided with a reflux pipe 109 for refluxing the distillate obtained with No. 08, and a bottom liquid withdrawing pipe 111 for taking out the bottom liquid from the regenerator 103.

Then, the collecting section 104 and the concentrating section 105 are provided.
For example, packings of a predetermined number of theoretical plates are arranged, and for example, assuming that the number of theoretical plates is 3 and 4, the height of the packings per one plate is 500 mm. Has a height (L ₁ ) of 1500 mm, and the height (L ₃ ) of the recovery unit 104 is 2000 mm.

[0004]

As described above, the recovery unit 1
Since packing materials are arranged in a plurality of stages in 04 and the concentrating section 105, the rectification column main body 106 is inevitably elevated,
There is a problem that the manufacturing cost becomes high and the building itself becomes expensive.

Further, since the regenerator 103 is also of the shell-and-tube type, it has a large volume and accordingly requires a large installation space. Therefore, an object of the present invention is to provide a rectification column having a regenerator having a small volume and a low manufacturing cost.

[0006]

In order to solve the above-mentioned problems, the first means of the present invention is a rectification column main body in which a regenerator is provided in the lower part and a collecting part and a concentrating part are provided in the upper part. In the regenerator, a plate type in which a plurality of heat transfer plate members to which a heating fluid is supplied is arranged at regular intervals, or fins are provided in a stock solution dropping passage formed between the heat transfer plate members. It is composed of a plate fin type heat exchange part, above the heat transfer plate member,
It is a rectification tower in which a large number of dispersion holes are formed and a dispersion plate having corrugated or rectangular uneven portions in cross section is arranged.

The second means of the present invention is, in the rectification tower of the first means, the pitch of the uneven portions of the dispersion plate is made the same as the arrangement pitch of the heat transfer plate members, and The dispersion plate is arranged such that the valleys are along the upper edge of one side surface of the heat transfer plate member and are located close to each other.

The third means of the present invention is, in the rectification tower of the above-mentioned first means, the pitch of the uneven portions of the dispersion plate is such that adjacent valleys are at the upper edges of both side surfaces of the heat transfer plate member. The distribution plates are set so as to follow each other, and the dispersion plate is arranged such that the valleys are located close to the upper edge of the heat transfer plate member.

A fourth means of the present invention is the rectifying tower of the first means, wherein the unevenness of the dispersion plate is such that peaks and valleys are along the upper edge of the heat transfer plate member. In addition, the pitch of the uneven portions of the dispersion plate is set so that at least one set of peaks and troughs is located above the stock solution dropping passage of the heat transfer plate member.

The fifth means of the present invention is the rectification column according to any one of the first to fourth means, wherein a plurality of dispersion plates are laminated so that the respective uneven portions are orthogonal to each other. It is a thing.

According to each of the above configurations, since the plate type or plate fin type heat transfer plate member is used for the heat exchange section of the regenerator, the heat transfer area per unit volume is larger than that of the shell and tube type. Since the heat exchange part can be made very compact and the function of the recovery part can be exerted in the regenerator, the required height of the packing in the recovery part can be reduced and therefore The height of the distillation column as a whole can be reduced.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the rectification column of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the rectification column 1 is provided with a regenerator (reboiler) 3 in which a heat exchange section 2 is arranged in the lower part, and a recovery section 4 and a concentrating section 5 in the upper part. Rectification tower body 6 and recovery section 4 of the rectification tower body 6
And a concentrating section 5 are connected between the rectification column body 6 and the undiluted solution supply pipe 7 for supplying the undiluted solution into the rectification column main body 6, and the condenser 8 is removed from the top of the rectification column main body 6 along with
And a distillate withdrawal pipe portion 10 provided with a reflux pipe 9 for refluxing the distillate obtained in the condenser 8,
Bottom liquid take-out pipe 11 for taking out bottom liquid from the regenerator 3
It is composed of

A heat exchange section 2 arranged in the regenerator 3;
For example, plate fin type is used
You. That is, as shown in FIG. 2 and FIG.
Close the upper and lower parts of the heat plates 21 and 21 and these heat transfer plates 21 and 21.
And a closing plate 22 that closes
A heating fluid passage, for example, a heating steam passage, between the heat transfer plates 21 and 21.
Heat transfer plate member 24 in the vertical direction formed by forming 23
Is a predetermined pitch P ₁ Placed parallel to each other, and
A stock solution supply passage between the heat transfer plate members 24, 24.
The undiluted solution dropping passage 25 is formed, and this undiluted solution falls
The corrugated fins 26 are arranged in the passage 25.

In this fin 26, the small fins 26a having a narrow width have the wave bending direction in the horizontal direction, and the phases of the small fins 26a are shifted so that the peaks and valleys of the adjacent small fins 26a are displaced from each other. Installed. The fins 26 may be provided in the heating steam passage 23 in the heat transfer plate member 24.

On the upper part of the heat transfer plate member 24, a corrugated dispersion plate 31 is horizontally installed. The dispersion plate 31 has a configuration in which a perforated plate in which a large number of dispersion holes 32 are formed at regular intervals is corrugated at the same pitch P ₂ as the arrangement pitch P ₁ of the heat transfer plate members 24, Further, the dispersion plate 3 is arranged so that the valley portion 31a approaches one opening edge of the undiluted solution drop passage 25, that is, the upper edge of one side surface of the heat transfer plate member 24.
1 is fixed. As shown in FIG. 1, the heating steam supply pipe 1 for supplying heating steam (steam) as a heating fluid to the heating steam passage 23 of the heat transfer plate member 24.
2 is connected.

The operation of the above configuration will be described below. It should be noted that the operation of the rectification column itself is omitted, and in this description, only the operation of the regenerator 3 portion will be described.

That is, with the heating steam (steam) being supplied into the heating steam passage 23 formed in the heat transfer plate member 24 arranged in the regenerator 3, the rectification column is supplied from the stock solution supply pipe 7. The stock solution supplied into the main body 6 is
It falls through the recovery unit 4 and onto the regenerator 3. The dropped stock solution is first uniformly dispersed by the dispersion plate 31 and flows down in the stock solution dropping passage 25.

At this time, the stock solution is heated and evaporated by the heating steam flowing in the heating steam passage 23 in the heat transfer plate member 24. The evaporated undiluted liquid gas rises in the undiluted liquid dropping passage 25 (is of a countercurrent type), and passes through the dispersion holes 32 formed in the mountain portion 31b of the dispersion plate 31 and the upper recovery unit 4 and the concentrated liquid. After passing through the section 5, it reaches the distillate extraction pipe section 10, where it is condensed by the condenser 8 and taken out as a distillate, and a part thereof is refluxed into the rectification column main body 6.

According to the above configuration, the stock solution can be uniformly dispersed and supplied to the heat transfer plate member 24 side with a simple structure in which the dispersion plate 31 having a corrugated perforated plate is arranged. Can be efficiently gasified.

That is, since the heat exchanging section 2 performs a distillation action, the function of the recovering section 4 is exhibited.
The distillation effect (rectification effect) by the plate fin type heat exchange unit 2 corresponds to, for example, three theoretical plates of the packing, and therefore the packing height (L ₂ ) in the recovery unit 4 is one plate. (4 steps-3 steps), and a height of about 500 mm is sufficient.

The amount of packing in the recovery section 4 and the concentration section 5,
That is, the height of the packing (L
If converted by ₂ , L ₁ ), the ratio R shown by the following formula is obtained as compared with the conventional case.

R = (L ₁ + L ₂ ) / (L ₁ + L ₃ ) ... In the formula, L ₃ represents the height of the packing material in the conventional recovery section. Substituting a specific numerical value, R = (1500 + 500) / (1500 + 2000) = 0.57, which is a cost reduction of about 40%.

Further, even when the height of the rectification column main body 6 is compared with the height of the packing, the height is reduced by the height H shown in the following formula. H = L ₃ −L ₂ ... Substituting a specific numerical value, H = 2000−500 = 1500 mm, and the height becomes lower by about 1500 mm.

Furthermore, since the regenerator 3 itself is more compact than that of the shell-and-tube type, the amount of liquid held can be reduced, and the manufacturing cost and running cost can be reduced.

The heat exchange section 2 may be a plate type without fins. Next, a second embodiment of the present invention will be described. The dispersion plate of the regenerator according to the second embodiment is the same as the dispersion plate according to the first embodiment except that the pitch of the uneven portions is changed.

As shown in FIG. 4, in the dispersion plate 41 according to the second embodiment, the adjoining valley portions 41a are arranged along both opening edges of the stock solution dropping passage 25, that is, on both sides of the heat transfer plate member 24. It is formed and arranged so as to approach along the upper edge of the surface, and for example, the mountain portion 41b is located immediately above the heat transfer plate member 24, and the valley portion 41a is not located.

Therefore, the position above the stock solution drop passage 25 is
Pitch P between these valleys 41a to be placed_Three And adjacent to this
41a located above the heat transfer plate member 24
Pitch between_Four And are set to be different and adjacent
Sum of pitches P_Five (P _Three + P_Four = P_Five ) Is the heat transfer
Arrangement pitch P of the rate member 24₁ To be the same as
Is defined.

Therefore, since the valleys 41a of the dispersion plate 41 are arranged close to both side surfaces of the heat transfer plate member 24, it is possible to efficiently heat the undiluted solution, so that the distillation effect (thermal efficiency) can be achieved. ) Can be improved.

Next, a third embodiment of the present invention will be described. As shown in FIG. 5, in the dispersion plate 51 according to the third embodiment, the valleys 51a (or the peaks 5a) are formed.
The pitch P _{6 of} 1b) is made equal, and the valleys 51a and the peaks 51b thereof are arranged along the upper edge of the heat transfer plate member 24 (in the width direction of the heat transfer surface). The pitch P ₆ of the uneven portions of the plate 51 is set to be equal to or less than twice the width B of the stock solution dropping passage 25 between the heat transfer plate members 24, that is, P ₆ <2B.
At least one set of valleys 51a and peaks 51b is located above the width B of the groove 5.

Therefore, the stock solution dropped into the stock solution dropping passage 25 and the stock solution gas rising from the stock solution dropping passage 25 can be passed smoothly and uniformly. Next, a fourth embodiment of the present invention will be described.

As shown in FIG. 6, in the dispersion plate 61 of the fourth embodiment, the irregularities of the dispersion plate of the first embodiment are rectangular rather than wavy. is there. That is, the dispersion plate 61 is a perforated plate which is a rectangular concavo-convex portion in which U-shaped sections are alternately repeated. Also in this case, the same effect as in the first embodiment can be obtained.

Next, a fifth embodiment of the present invention will be described. As shown in FIG. 7, in the dispersion plate 71 in the fifth embodiment, the concave and convex portions of the dispersion plate in the second embodiment have U-shaped shapes repeated in the same manner as in the fourth embodiment. It is a rectangular shape configured as described above, and can also exhibit the same effect as that of the second embodiment.

Next, a sixth embodiment of the present invention will be described. As shown in FIG. 8, the dispersion plate 81 in the sixth embodiment is the dispersion plate 3 in the first embodiment.
Two of them are arranged so that the bending directions of the respective concave and convex portions are orthogonal to each other, that is, the valleys 31a (or the peaks 31b) are orthogonal to each other. The dispersion effect of the stock solution by the plate 31 can be further improved. Of course, two or more dispersion plates 31 may be laminated, and the dispersion plates described in the second to fifth embodiments may be arranged so as to be orthogonal to each other.

[0035]

As described above, according to each constitution of the present invention,
Since the plate type or plate fin type structure was adopted for the heat exchange part of the regenerator, the heat transfer area per unit volume is much larger than that of the shell and tube type, making the heat exchange part compact. In addition, since the function of the recovery unit can be exerted in the regenerator, the required height of the filler in the recovery unit can be reduced,
Therefore, the height of the entire rectification column can be reduced, which in turn can reduce the manufacturing cost.

Further, since the uneven dispersion plate is provided, the undiluted solution is uniformly supplied to the heat transfer plate member side through the dispersion holes in the valleys, and the gas of the undiluted solution heated and evaporated by the heat transfer plate member is also supplied. Since the gas is introduced upward from the dispersion hole in the mountain portion, the gas of the undiluted solution can be efficiently generated with an extremely simple configuration.

Further, the pitch of the uneven portions of the dispersion plate is set so that at least one pair of peaks and troughs is located above the width of the stock solution dropping passage formed between the heat transfer plate members. As a result, it is possible to uniformly disperse the stock solution dropped in the stock solution dropping passage and to reliably guide the gas of the stock solution upward.

Furthermore, since the valleys of the uneven dispersion plate are arranged close to the upper edge of the side surface of the heat transfer plate member, the undiluted solution is effectively dispersed on the heat transfer surface of the heat transfer plate member. It can be made to flow down, and therefore the heating efficiency of the stock solution can be improved.

Furthermore, by stacking dispersion plates,
The stock solution can be dispersed more uniformly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a rectification column according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a heat exchange section in the regenerator of the rectification tower.

FIG. 3 is a cross-sectional view of essential parts of a heat exchange section in the regenerator of the rectification tower.

FIG. 4 is a cross-sectional view of essential parts of a heat exchange unit according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of essential parts of a heat exchange unit according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of a heat exchange unit according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of essential parts of a heat exchange unit according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view of a main part of a heat exchange section according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view showing a schematic configuration of a rectification column in a conventional example.

[Explanation of symbols]

 1 Fractionation Tower 2 Heat Exchange Section 3 Regenerator 4 Recovery Section 5 Concentration Section 6 Fractionation Tower Main Body 7 Undiluted Solution Supply Pipe 23 Heating Steam Passage 24 Heat Transfer Plate Member 25 Undiluted Solution Drop Passage 26 Fin 31 Dispersion Plate 31a Valley 31b Mountain Part 41 dispersion plate 41a valley part 41b mountain part 51 dispersion plate 51a valley part 51b mountain part 61 dispersion plate 71 dispersion plate 81 dispersion plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Hiranaka 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Within Osaka Gas Co., Ltd. (72) Nobuo Hatanaka 4 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Chome 1-2 Osaka Gas Co., Ltd. (72) Inventor Tetsuji Horie 1-10 Fuso-cho, Amagasaki-shi, Hyogo Sumitomo Precision Industries Co., Ltd. (72) Katsio Iwata 1-10 Fuso-cho, Amagasaki-shi, Hyogo Sumitomo Precision Industries Ltd. (72) Inventor Takeshi Yano 5-3-8 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Akio Iwamoto, Nishikujo 5 Nishinojo-ku, Osaka City, Osaka Prefecture 3rd-28th Hitachi Shipbuilding Co., Ltd. (72) Inventor Masato Furuto 5th-3rd Nishi-Kyojo, Konohana-ku, Osaka-shi, Osaka City 3-28th Hitachi Shipbuilding Co. (72) Inventor Yu Fujita Osaka-shi, Osaka 5-3-28 Nishikujo, Hana-ku Inside Hitachi Zosen Corporation

Claims (5)

[Claims] 1. A plurality of heat transfer plates to which a heating fluid is supplied, wherein the regenerator of the rectification column main body is provided with a regenerator at the lower part and a recovery part and a concentrating part at the upper part. A plate type heat exchange unit in which members are arranged at regular intervals, or a plate fin type heat exchange unit in which fins are provided in the undiluted solution drop passage formed between these heat transfer plate members, is provided above the heat transfer plate member. A rectification column characterized by arranging a dispersion plate in which a large number of dispersion holes are formed and an uneven portion having a corrugated or rectangular cross section is formed. 2. The pitch of the concavo-convex portion of the dispersion plate is the same as the arrangement pitch of the heat transfer plate member, and the troughs of the concavo-convex portion are close to each other along the upper edge of one side surface of the heat transfer plate member. The rectification column according to claim 1, wherein the dispersion plate is arranged so as to be located at the position. 3. The pitch of the concavo-convex portion of the dispersion plate is set so that the adjacent valleys are respectively along the upper edges of both side surfaces of the heat transfer plate member, and the valleys are formed on the upper edge of the heat transfer plate member. The rectification column according to claim 1, wherein the dispersion plate is arranged so as to be close to each other. 4. The dispersion plate is arranged such that the peaks and valleys of the uneven portion are along the upper edge of the heat transfer plate member, and the pitch of the uneven portion of the dispersion plate is defined as the undiluted solution of the heat transfer plate member. 2. The setting is made so that at least one pair of peaks and troughs is located above the drop passage.
Fractionation tower described. 5. The rectification column according to any one of claims 1 to 4, wherein a plurality of dispersion plates are laminated so that the uneven portions are orthogonal to each other.