JPH1119457A - Gaseous hydrogen chloride absorption device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gaseous hydrogen chloride absorption device in which the frequency of replacement of a member for feeding hydrogen chloride containing fluid to a gas absorber can be reduced in gaseous hydrogen chloride absorption devices. SOLUTION: An absorber 21 is provided with a fluid feeding nozzle 22 for feeding hydrogen chloride containing fluid B, and in the end part on the upstream side of the fluid feeding nozzle 22, an indirect cooler 23 for indirectly cooling the hydrogen chloride containing fluid B is arranged side by side, and also the fluid feeding nozzle 22 is provided with a guide passage in which a guide cylinder leading to inside the absorber 21 at least from the head part of the guiding cylinder 24 and intended for guiding the hydrogen chloride containing fluid B cooled by the indirect cooler 22 to inside the absorber 21 and a heat exchange inner cylinder which is a constituent member of the indirect cooler 23 are integrated into one body. The contacted part with the hydrogen chloride containing fluid B leading to the head part of the guide cylinder from the indirect cooler 23 is formed of tantalum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen chloride gas absorbing apparatus in which, for example, a hydrogen chloride-containing fluid generated when an organic chloride compound is incinerated and decomposed is absorbed in water to recover hydrochloric acid.

[0002]

2. Description of the Related Art Conventionally, there has been known an exhaust gas cleaning apparatus for cleaning a gas containing hydrogen chloride generated when an organic chlorine compound is incinerated and decomposed by an alkaline circulating liquid such as caustic soda to absorb and remove harmful substances. One example is disclosed in, for example, Japanese Utility Model Laid-Open No. 58-171223.

FIG. 8 shows an exhaust gas cleaning apparatus disclosed in the above-mentioned publication. The exhaust gas cleaning apparatus indicated by reference numeral 1 in the figure includes a gas cleaning tower 2 in which untreated gas A is processed,
A gas supply pipe 3 for supplying an untreated gas A from the hydrogen chloride-containing gas source to the gas cleaning tower 2, and an end of the gas supply pipe 3 penetrating a side wall of the gas cleaning tower 2. The provided guide tube 4 is continuously provided via a flange F which is fixed to the outer wall surface of the gas cleaning tower 2.

The guide cylinder 4 extends from the side wall of the gas cleaning tower 2 to the vicinity of the level of the gas cleaning liquid L (including NaOH) stored in the lower part of the gas cleaning tower 2, and is provided therein. A nozzle pipe 5 into which the gas cleaning liquid L is fed is laid.
By spraying the gas cleaning liquid L toward the center of the guide tube 4, a number of cooling nozzles 6 are provided to directly cool the untreated gas A sent into the guide tube 4. The cooling device is constituted by the cooling nozzle 6.

[0005] The guide tube 4, the nozzle pipe 5,
The cooling nozzle 6 is formed of a corrosion-resistant material such as stainless steel or titanium in order to ensure its corrosion resistance.

A cleaning liquid discharge valve 7 for discharging the gas cleaning liquid L stored below the inside of the gas cleaning tower 2 is provided at a lower portion of the gas cleaning tower 2. A mist separator 8 that covers the upper opening is provided, and a cleaning liquid spray nozzle 9 for uniformly spraying the gas cleaning liquid L into the gas cleaning tower 2 is provided below the mist separator 8. A cleaning liquid circulation pump 10 for circulating and supplying a gas cleaning liquid L stored in a lower part of the gas cleaning tower 2 to the cleaning liquid spray nozzle 9 is connected.

Further, a cooling liquid circulation pump 11 for supplying a part of the gas cleaning liquid L stored in the lower part of the gas cleaning tower 2 to the nozzle pipe 5 as a cooling liquid is provided outside the gas cleaning tower 2. A supply water supply pipe 12 for supplying supply water M into the gas cleaning tower 2;
A pH adjuster 13 for detecting H and supplying caustic soda is provided.

In the exhaust gas cleaning apparatus 1 configured as described above, a part of the gas cleaning liquid L stored in the lower part of the gas cleaning tower 2 is supplied to the cooling nozzle 6 by the cooling liquid circulation pump 11, While being sprayed into the inside of the guide cylinder 4, another part thereof is
0, it is supplied to the cleaning liquid spray nozzle 9 and sprayed into the gas cleaning tower 2 from above. In this state, when the untreated gas A is sent from the gas supply pipe 3 through the guide cylinder 4 into the gas cleaning tower 2,
Harmful substances such as hydrogen chloride in the untreated gas A are neutralized and absorbed by the cleaning liquid L.

More specifically, the gas supply pipe 3
While the untreated gas A having a high temperature (hundreds of degrees) is fed into and passed through the guide cylinder 4, the untreated gas A is brought into contact with the gas cleaning liquid L sprayed from the cooling nozzle 6 and cooled. Part of the hydrogen chloride gas contained in the untreated gas A is absorbed in the gas cleaning liquid L.

Further, the untreated gas A is supplied to the guide cylinder 4
From the tip of the gas cleaning tower 2 to the upper opening of the gas cleaning tower 2, during which the gas is brought into contact with the gas cleaning liquid L sprayed from the cleaning liquid spray nozzle 9 and further cooled, and The harmful substances such as hydrogen chloride therein are neutralized and absorbed by the gas cleaning liquid L.

The gas after cleaning passes through the mist separator 8 and is discharged to the outside through the upper opening of the gas cleaning tower 2, but is separated from the gas cleaning liquid L while passing through the mist separator 8. It is discharged outside.

Therefore, in the exhaust gas cleaning apparatus 1, the untreated gas A is brought into direct contact with the coolant in the guide tube 4, and the gas cleaning tower 2 is guided by the guide tube 4.
Is cooled down, the temperature of the untreated gas A sent into the gas cleaning tower 2 is kept low, and the corrosion of the gas cleaning tower 2 is suppressed.

[0013]

In such an exhaust gas cleaning apparatus 1, water is circulated in place of the alkali circulating liquid used for the gas cleaning liquid L, and the untreated gas A (hydrogen chloride-containing fluid) is passed through the water. By absorbing hydrogen chloride and recovering the absorbed liquid, the device can be operated as a hydrogen chloride gas absorbing device for recovering hydrochloric acid.

However, when the exhaust gas cleaning apparatus 1 having the above configuration is operated as a hydrogen chloride gas absorbing apparatus, if the operation time is long, the guide cylinder 4 inserted into the gas cleaning tower 2 may be made of stainless steel or titanium. In spite of being formed of a corrosion-resistant material, it is corroded by a high-temperature and moist hydrogen chloride-containing fluid, so that there is a problem that the guide cylinder 4 must be frequently replaced.

Even if the guide cylinder 4 is coated with an acid-resistant coating or an FRP coating in order to deal with such a problem, the heat resistance of these materials is low. 90 ° C
Damage occurs during cooling to below, for example, carbonization in FRP coatings.

Further, if Hastelloy B is used as a constituent material of the guide cylinder 4 in order to improve the corrosion resistance, there is a problem that the recovered hydrochloric acid is colored by the elution of molybdenum, which is an effective means. Does not.

With the above configuration, the cooling liquid sprayed from the cooling nozzle 6 scatters to the gas supply pipe 3 for supplying the hydrogen chloride-containing gas. When the coolant adheres to the gas supply pipe 3, a corrosive environment is generated because the gas supply pipe 3 is made of carbon steel, and the gas supply pipe 3 is severely corroded. Had to be replaced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a gas absorption tower for a hydrogen chloride gas absorbing apparatus in which hydrogen chloride of a hydrogen chloride-containing fluid is absorbed by water to recover hydrochloric acid. It is an object of the present invention to provide a hydrogen chloride gas absorbing device capable of reducing the frequency of replacement of a member for supplying a hydrogen chloride-containing fluid to the device.

[0019]

According to a first aspect of the present invention, there is provided a hydrogen chloride gas absorbing apparatus which supplies a hydrogen chloride-containing fluid and water into an absorption tower to achieve the above-mentioned object. A hydrogen chloride gas absorbing device for absorbing and recovering hydrogen chloride of the hydrogen chloride-containing fluid into the water, wherein the hydrogen chloride-containing fluid is fed upstream of a fluid supply nozzle of the absorption tower into which the hydrogen chloride-containing fluid is fed. An indirect cooler for indirectly cooling the fluid is provided, and at the inside of the fluid supply nozzle, at least from the tip of the fluid supply nozzle to the inside of the absorption tower, containing hydrogen chloride cooled by the indirect cooler A guide tube for guiding a fluid to the inside of the absorption tower is provided, and a contact portion of the hydrogen chloride-containing fluid from the indirect cooler to a tip of the guide tube inside the absorption tower is tantalum. Characterized in that it was.

According to a second aspect of the present invention, in the hydrogen chloride gas absorbing device according to the first aspect, the indirect cooler includes a heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows, A cooling pipe that is wound along the outer peripheral surface of the cylinder and through which a refrigerant that cools the hydrogen chloride-containing fluid flows, and a heat insulating material provided over the cooling pipe, and the heat exchange inner cylinder Is formed of tantalum.

According to a third aspect of the present invention, there is provided the hydrogen chloride gas absorbing device according to the first aspect, wherein the indirect cooler includes a heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows, An annular jacket that is arranged along the outer periphery of the cylinder and forms a refrigerant flow path through which a refrigerant that cools the hydrogen chloride-containing fluid flows, and at least the heat exchange inner cylinder is formed of tantalum. It is characterized by having been done.

According to a fourth aspect of the present invention, in the hydrogen chloride gas absorbing device according to the second or third aspect, the indirect cooler and the guide tube are connected to each other by the heat exchange inner tube and / or the guide tube. The fluid supply nozzle is detachably connected to the fluid supply nozzle by sandwiching a locking ring made of an annular tantalum between the flange into which the heat exchange inner cylinder is inserted and the flange of the fluid supply nozzle.

As a mode of forming an annular locking ring on the heat exchange inner cylinder and / or the guide cylinder, the inner peripheral end of the locking ring and the outer circumference of the heat exchange inner cylinder and the guide cylinder are formed by welding. Alternatively, a locking ring may be formed by expanding the heat exchange inner cylinder or the end of the guide cylinder itself and bending it outward.
There are various aspects.

According to a fifth aspect of the present invention, in the hydrogen chloride gas absorbing device according to the second to fourth aspects, the connection between the indirect cooler and a fluid supply pipe into which the hydrogen chloride-containing fluid is fed is as follows. The retaining ring made of annular tantalum from the heat exchange inner cylinder is detachable by being sandwiched between a flange in which the heat exchange inner cylinder is inserted and a flange of the fluid supply pipe.

According to a sixth aspect of the present invention, in the hydrogen chloride gas absorbing device according to the fourth or fifth aspect, the indirect cooler includes a heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows; The refrigerant is disposed along the outer periphery of the heat exchange inner cylinder, and the outer peripheral portions at both ends are welded and fixed to the side surfaces of the flange provided on the heat exchange inner cylinder, respectively, and a coolant for cooling the hydrogen chloride-containing fluid flows. An annular jacket forming a refrigerant flow path, and the heat exchange inner cylinder is formed of tantalum, and the flange and the jacket are formed of stainless steel or carbon steel. And

According to a seventh aspect of the present invention, in the hydrogen chloride gas absorbing device according to the first to sixth aspects, the heat exchange inner cylinder and the guide cylinder of the indirect cooler are integrally formed. It is characterized by.

[0027] In the hydrogen chloride gas absorbing device according to claim 8 of the present invention, according to any one of claims 1 to 7, the guide tube is provided inside the fluid supply nozzle so as to be spaced apart therefrom. The fluid supply nozzle is characterized in that the inner surface is coated with FRP.

Here, the hydrogen chloride-containing fluid includes both a case where the entire fluid is gaseous and a case where it is a gas-liquid two-phase fluid in which mist is mixed in the gas.

[0029]

According to the hydrogen chloride gas absorbing device according to the first aspect of the present invention, at least a portion from the indirect cooler for introducing the high-temperature hydrogen chloride-containing fluid to the tip of the guide cylinder, which is in contact with the hydrogen chloride-containing fluid, is made of tantalum. By doing so, the high-temperature hydrogen chloride-containing fluid is cooled in the indirect cooler to condense water vapor and the like, and further, the cooled hydrogen chloride-containing fluid is guided to the guide cylinder and guided to the inside of the gas absorption tower. .

At this time, the hydrogen chloride-containing fluid is efficiently cooled by the high thermal conductivity of the tantalum, and the hydrogen embrittlement of the tantalum is suppressed and the durability is improved.

Since the hydrogen chloride-containing fluid is cooled by the indirect cooling, there is no contact between the hydrogen chloride and the cooling refrigerant, so that the refrigerant is connected to the fluid connected upstream of the indirect cooler. Adhesion to the supply pipe is prevented, thereby preventing the formation of a corrosive environment and preventing the fluid supply pipe from being damaged. According to the hydrogen chloride gas absorbing device according to claim 2 of the present invention, the refrigerant is cooled by flowing a refrigerant through a cooling pipe wound around an outer peripheral surface of a heat exchange inner cylinder constituting an indirect cooler. The temperature rise of the cylinder is reliably suppressed, and hydrogen embrittlement of tantalum forming the heat exchange inner cylinder is prevented.

[0032] According to the hydrogen chloride gas absorbing device of the third aspect of the present invention, an annular ring is provided on the outer periphery of the heat exchange inner tube constituting the indirect cooler so as to cover the outer periphery of the heat exchange inner tube. A cooling channel is formed by the jacket, and the cooling efficiency of the heat exchange inner cylinder is increased by directly cooling the heat exchange inner cylinder by flowing a coolant through the refrigerant flow passage, and tantalum forming the heat exchange inner cylinder is formed. Has an effect of suppressing hydrogen embrittlement.

According to the hydrogen chloride gas absorbing device according to the fourth aspect of the present invention, the heat exchange inner cylinder and the guide cylinder of the indirect cooler have a mounting structure in which the inner cylinder and the guide cylinder are sandwiched by opposed flanges via the locking ring. In addition, a flange made of an inexpensive dissimilar material, such as carbon steel, which cannot be welded to tantalum without the hydrogen chloride-containing fluid coming into direct contact with the flange, can be used, thereby suppressing a rise in cost and It has a structure that can be attached to and detached from the absorption tower, facilitating maintenance and inspection of the heat exchanger and guide tube.

According to the hydrogen chloride gas absorbing device of the present invention, the connection between the heat exchange inner cylinder of the indirect cooler and the fluid supply pipe is sandwiched between the opposed flanges via the locking ring. In this way, it is possible to adopt a flange made of an inexpensive dissimilar material such as carbon steel which cannot be welded to tantalum, thereby suppressing a rise in cost and being detachable from the fluid supply pipe. The structure makes maintenance and inspection of the heat exchanger and guide tube easier.

According to the hydrogen chloride gas absorbing device of the present invention, the jacket forming the refrigerant flow path around the heat exchange inner cylinder constituting the indirect cooler is made of stainless steel or carbon steel. In addition, the cost of the indirect cooler can be reduced.

According to the hydrogen chloride gas absorbing device of the present invention, since the indirect cooler and the guide tube are integrally formed, the cooling action of the indirect cooler extends to the guide tube. As a result, not only the indirect cooler but also the guide cylinder is cooled, and hydrogen embrittlement of the guide cylinder is further prevented.

According to the hydrogen chloride gas absorbing device of the present invention, the guide tube is inserted inside the fluid supply nozzle, so that an air layer is formed between the fluid supply nozzle and the guide tube. Accordingly, the amount of heat transmitted from the guide cylinder to the fluid supply nozzle is reduced, and even if the inner surface of the fluid supply nozzle is coated with FRP that is weak against high heat, the corrosion resistance of the fluid supply nozzle is increased, As a result, the durability of the absorption tower is improved.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 20 denotes a hydrogen chloride gas absorbing device according to the present embodiment. The hydrogen chloride gas absorbing device 20 supplies a hydrogen chloride-containing fluid B and a makeup water W into an absorption tower 21 respectively. In this water, the hydrogen chloride gas of the hydrogen chloride-containing fluid B is absorbed to recover chlorine, and the absorption tower 21 is provided with a fluid supply nozzle 22 for feeding the hydrogen chloride-containing fluid B, At the upstream end of the fluid supply nozzle 22, an indirect cooler 23 for indirectly cooling the hydrogen chloride-containing fluid B supplied therein is provided.

Further, inside the fluid supply nozzle 22,
At least from the tip to the inside of the absorption tower 21,
A guide cylinder according to the present invention for guiding the hydrogen chloride-containing fluid B cooled by the indirect cooler 23 into the absorption tower 21 is provided. However, in this embodiment,
The guide cylinder and the heat exchange inner cylinder according to the present invention, which are constituent members of the indirect cooler 23 and through which the hydrogen chloride-containing fluid B flows, are integrally formed. That is, the lower end of the guide tube 24 in which the guide tube and the heat exchange inner tube according to the present invention are integrated is inserted inside the fluid supply nozzle 22 and reaches the inner bottom center of the absorption tower 21.
This guide cylinder 24 is formed of tantalum. Therefore, the guide cylinder according to the present invention is configured to extend at least from the front end of the fluid supply nozzle 22 to the inside of the absorption tower 21, and from the indirect cooler 23 to the front end (lower end) of the guide cylinder. The contact portion with the hydrogen chloride-containing fluid B is tantalum.

More specifically, the fluid supply nozzle 22 is provided obliquely upward from a side wall near the lower portion of the absorption tower 21, and the fluid supply nozzle 22 has an inward cooling end at an outer end thereof. A flange 25 to which the vessel 23 is connected is provided integrally.

As shown in FIGS. 2 and 3, in the present embodiment, the outer end of the guide tube 24 is made of carbon steel from a hydrogen chloride-containing fluid source (not shown). A flange 28 to which a fluid supply pipe 27 (see FIG. 1) is connected is provided integrally, and a flange 26 connected to the flange 25 is provided on an outer periphery at an intermediate position separated from the outer end by a predetermined length. Are provided integrally. On the outer peripheral surface of the guide cylinder 24, a cooling pipe 29 through which a cooling refrigerant flows is wound substantially all over a portion located between the two flanges 26 and 28,
Further, a heat insulating material 30 such as thermocement is provided so as to cover the cooling pipe 29.

Therefore, the indirect cooler 2 according to the present invention
Reference numeral 3 in the present embodiment is constituted by the upper end portion of the guide tube 24 (heat exchange inner tube), the cooling pipe 29 and the heat insulating material 30.

The cooling pipe 29 is made of copper having excellent heat conductivity, and cooling water is usually used as a refrigerant.

Each of the flanges 26 and 28 is formed of carbon steel. As shown in FIG. 3, a guide tube according to the present invention and a heat exchange inner tube of the indirect cooler 23 are integrated. The tube 24 is detachable from the fluid supply nozzle 22 by sandwiching a locking ring 31 made of annular tantalum from the guide tube 24 between the flange 26 into which the guide tube 24 is inserted and the flange 25 of the fluid supply nozzle 22. It is connected to the. In this embodiment, the inner peripheral end of the locking ring 31 is welded and fixed to the outer circumference of the guide tube 24, and the flange 26 is provided with the locking ring 31 and the gasket 33 interposed therebetween and the fluid supply nozzle is bolted and nutd. The guide tube 24, that is, the indirect cooler 23, is fixed to the absorption tower 21 by being fastened and fixed to the flange 25 of the 22. Similarly, the guide tube 24 is attached to the fluid supply pipe 27 by sandwiching the locking ring 32 made of annular tantalum from the guide tube 24 between the flange 28 into which the guide tube 24 is inserted and the flange 27 a of the fluid supply pipe 27. Are also detachably connected. That is, the inner peripheral end of the locking ring 32 is welded and fixed to the outer periphery of the guide cylinder 24,
Are provided with a locking ring 32 and a gasket (not shown), and a bolt 2
The guide tube 24, that is, the indirect cooler 23, and the fluid supply pipe 27 are connected and fixed by being fixedly fastened to 7a. The mounting structure in which the locking rings 31 and 32 are sandwiched between the opposed flanges is adopted because of the material characteristics of tantalum that tantalum can be welded to each other but cannot be welded to a different material such as carbon steel. is there. In the present embodiment, in addition to such an attachment structure, the following measures are taken.

That is, the annular locking rings 31.3
Reference numeral 2 is formed in a lid shape by bending the outer peripheral end substantially at a right angle. The annular surfaces of the locking rings 31 and 32 cover the gasket seats (connection surfaces) 26b and 28b of the flanges 26 and 28 into which the guide tubes 24 are inserted, and the bent outer peripheral ends of the flanges 26 and 28 Gasket seat 26b / 28
b Annular locking steps 26a and 28 formed at the outer peripheral edge
a, and more preferably, the outer peripheral end portion is pressed against the locking step portions 26a, 28a by caulking (caulking), and the flanges 26, 28
It is integrated into.

Further, in the present embodiment, as shown in FIG. 3, the guide cylinder 24 is provided inside the fluid supply nozzle 22 of the gas absorption tower 21 at a distance. Further, the absorption tower 21 formed of carbon steel is used.
Main body and inner surface of fluid supply nozzle 22 and flange 2
On the surface of No. 5, an FRP coating layer 34 is integrally formed.

A makeup water supply pipe 36 for supplying makeup water W is connected to the side wall of the absorption tower 21.
Above the inside of the absorption tower 21, a mist separator 37 is provided so as to cover the upper opening, and below the absorption tower 21, a hydrogen chloride gas as an absorption liquid stored below the absorption tower 21 is provided. A part of the aqueous solution H containing hydrogen chloride gas is supplied and the aqueous solution H containing hydrogen chloride gas is supplied to the absorption tower 21.
A plurality of spray headers 38 are provided for spraying the inside.

The spray header 38 is provided with a circulation pump 39 for supplying the aqueous solution H containing hydrogen chloride gas stored in the lower part of the absorption tower 21 to the spray header 38. 40 are connected.

Further, below the inside of the absorption tower 21,
Baffle plate 41 facing the guide tube 24
Is installed.

A discharge valve 35 is provided at the lower end of the absorption tower 21 for recovering the aqueous solution H (hydrochloric acid) containing hydrogen chloride gas having absorbed hydrogen chloride from the absorption tower 21 and sending it to a predetermined position. I have.

In the hydrogen chloride gas absorbing device 20 according to the present embodiment thus configured, the hydrogen chloride-containing fluid B flows through the fluid supply pipe 27, the indirect cooler 23, that is, the guide tube 24, and into the absorption tower. The coolant B is supplied to the cooling pipe 29 of the indirect cooler 23, and while the hydrogen chloride-containing fluid B passes through the indirect cooler 23, the guide tube 24 and Heat exchange with the cooling water is performed through the wall of the cooling pipe 29,
It is cooled from a temperature of several hundred degrees to 120 ° C. or lower, preferably 100 ° C. or lower, more preferably 90 ° C. or lower. The cooled hydrogen chloride-containing fluid B is sent to the absorption tower 21.

In the absorption tower 21, a part of the aqueous solution H containing hydrogen chloride gas stored in the lower part is supplied to the spray header 38 by the circulation pump 39 and the pipe 40 for spraying the absorbing liquid, and these spray headers are also supplied. The aqueous solution H containing hydrogen chloride gas is sprayed into the absorption tower 21 via 38. Therefore, the aqueous solution H containing hydrogen chloride gas stored in the lower part of the absorption tower 21
Is circulated inside the absorption tower 21 and the internal temperature of the absorption tower 21 is maintained at about 60 ° C.

The cooled hydrogen chloride-containing fluid B sent to the absorption tower 21 comes into contact with the hydrogen chloride gas-containing aqueous solution H sprayed in the absorption tower 21 to absorb and purify the hydrogen chloride in the fluid. Then, the mist is removed by the mist separator 37, and if necessary, the mist is removed and released to the atmosphere.

The aqueous solution H containing hydrogen chloride gas having an increased concentration after absorbing hydrogen chloride is discharged from the absorption tower 21 through the discharge valve 35 and recovered as hydrochloric acid. The amount of water substantially equal to the amount of the extracted aqueous solution H containing hydrogen chloride gas is supplied water W
Is supplied from the makeup water supply pipe 36.

In the guide tube 24 of this embodiment, since the guide tube 24 is formed of tantalum having a large thermal conductivity, the guide tube 24 absorbs the heat by heat exchange with the high-temperature hydrogen chloride-containing fluid B. The heat is quickly transmitted to and removed from the cooling pipe 29, and as a result, the chlorine-containing fluid B is quickly cooled, and
4 is suppressed.

Therefore, the hydrogen embrittlement of the tantalum forming the guide cylinder 24 is suppressed, the durability is improved, and the frequency of replacement is greatly reduced.

The outer surface of the guide tube 24 for guiding the hydrogen chloride-containing fluid B cooled by the indirect cooler 23 into the absorption tower 21 is sprayed from a spray header 38 in the absorption tower 21. And the temperature of the inflowing hydrogen chloride-containing fluid B is controlled by the indirect cooler 2 as described above.
In conjunction with the fact that it has been sufficiently reduced by 3,
A rise in the temperature of the guide tube 24 is suppressed, and hydrogen embrittlement of tantalum is suppressed, and durability is improved.

Further, in the present embodiment, since the guide tube 24 forms a part of the indirect cooler 23, the heat absorbed in the guide tube 24 is transferred to the cooling water of the indirect cooler 23. As a result, the entirety of the guide cylinder 24 forming the flow path of the hydrogen chloride-containing fluid B is efficiently cooled, the temperature rise is suppressed, and the hydrogen embrittlement of tantalum is suppressed. Is further improved, and the replacement frequency of the guide tube 24 and the like is further reduced.

Further, since the temperature of the hydrogen chloride-containing fluid B sent into the absorption tower 21 via the indirect cooler 23 and the guide tube 24 is sufficiently reduced, the corrosion resistance treatment in the absorption tower 21 is improved. The absorption tower 21 can be made corrosion-resistant by a simple process such as providing the above-described FRP coating layer 34, and as a result, the cost of the absorption tower 21 can be reduced.

Further, since the configuration is such that the high-temperature hydrogen chloride-containing fluid B is indirectly cooled, it is not necessary to provide the cooling nozzle 6 unlike the prior art. Does not scatter to the fluid supply pipe 27 formed by the fluid supply pipe 27, and as a result, the occurrence of corrosion in the fluid supply pipe 27 is prevented, and the durability thereof is improved.

On the other hand, in this embodiment, the flange 2
Since the guide tube 24 has a double structure in which the guide tube 24 is inserted at a distance from the inner surface of the fluid supply nozzle 22 via 5.26, an annular space is formed between the guide tube 24 and the fluid supply nozzle 22. As a result, the heat of the guide tube 24 is not directly transmitted to the fluid supply nozzle 22 or the side wall of the absorption tower 21, and the FRP coating layer 34 provided on the inner surface thereof is not provided.
Degradation is suppressed. Further, in the present embodiment,
The indirect cooler 23, i.
Flanges 25, 26, 28, 2 facing each other through 32
7a, an inexpensive flange made of carbon steel that cannot be welded to tantalum can be adopted, thereby suppressing a rise in cost and increasing the fluid supply nozzle 22 of the absorption tower 21. And a structure that can be attached to and detached from the fluid supply pipe, facilitating maintenance and inspection of the heat exchanger and the guide cylinder.

Then, no coloring was observed in the hydrochloric acid recovered by the hydrogen chloride gas absorbing device 20 having the above-mentioned structure, and high-quality hydrochloric acid was recovered.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5 have the same configuration as that of the hydrogen chloride gas absorption device 20 of the first embodiment described above, and the description thereof is omitted. The same components as those of the embodiment are denoted by the same reference numerals, and description thereof is omitted.

4 and 5, reference numeral 50 denotes a hydrogen chloride gas absorbing device according to the present embodiment. In these figures, the indirect cooler denoted by reference numeral 51 is
An annular jacket 52 that forms a cooling water passage C over the entire periphery is provided on the outer periphery located between the flanges 26 and 28 at the upper end of the upper surface 4, and a flange is provided at an end of the jacket 52 at an appropriate position. Water pipe 53 and drain pipe 5
4 is attached. The jacket 52, the water supply pipe 53, and the drain pipe 54 are made of tantalum, and the jacket 52 is liquid-tightly fixed to the outer periphery of the guide cylinder 24 by welding.

With such a configuration, the volume of the cooling water passage C is enlarged, the amount of cooling water flowing inside the cooling water passage C is increased, and the cooling water is brought into direct contact with the outer peripheral surface of the guide cylinder 24. The cooling water and the guide tube 2
4 and the heat exchange efficiency with the heat exchanger 4 is improved.

As a result, the rise in the temperature of the guide cylinder 24 is more reliably suppressed, and the durability thereof is improved.

FIGS. 6 and 7 show a third embodiment of the present invention.
6 and FIG. 7 have the same configuration as the hydrogen chloride gas absorbing device 20 of the first embodiment, the description thereof is omitted, and also in FIG. 6 and FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In these figures, the hydrogen chloride-containing gas absorbing device indicated by reference numeral 60 is provided with an indirect cooler indicated by reference numeral 61 in these figures, and the stainless steel is used in place of the jacket 52 in the second embodiment. Jacket 6 consisting of
2, both ends of the jacket 62 are liquid-tightly welded to the side surfaces of the flanges 26 and 28 formed of carbon steel. This jacket 62
At an appropriate position, a water supply pipe 63 and a drain pipe 64 each having a flange provided at a tip thereof are attached. The water supply pipe 63 and the drain pipe 64 are formed of the same material as the jacket 62.

With this configuration, even when the jacket 62 is replaced with stainless steel, which is less expensive than tantalum, the cooling water passage C can be formed by welding to the flanges 26 and 28. The cost can be reduced while ensuring the cooling efficiency.

The shapes, dimensions, and the like of the components shown in each of the above embodiments are merely examples, and can be variously changed based on design requirements and the like.

For example, the cooling nozzle 6 shown in FIG. 8 is provided inside the guide tube 24 shown in each of the above-described embodiments, and the aqueous solution H containing hydrogen chloride gas is sprayed into the guide tube 24 so that The hydrogen chloride-containing fluid B flowing in the guide cylinder 24 is brought into direct contact with the hydrogen chloride gas-containing aqueous solution H,
It is also possible to make the aqueous solution H containing hydrogen chloride gas absorb the hydrogen chloride of the fluid B containing hydrogen chloride.

However, when such a configuration is adopted,
It is desirable that the cooling nozzle 6 is formed of tantalum in consideration of corrosion resistance and the like, and the presence of the hydrogen chloride gas-containing aqueous solution H containing the hydrogen chloride-containing fluid B in the guide cylinder 24 makes the hydrogen chloride gas When the mist of the contained aqueous solution H scatters on the fluid supply pipe 27, it is assumed that the mist adheres to the fluid supply pipe 27 and creates a corrosive environment. It is preferable to make the distance between them sufficiently large.

Further, in each of the above embodiments, the heat exchange inner cylinder and / or the guide cylinder, that is, the guide cylinder 24 according to the present invention, which constitutes the indirect coolers 23, 51 and 61,
As a mode of forming the annular locking rings 31 and 32,
The welding of the inner peripheral ends of the locking rings 31 and 32 and the outer periphery of the guide tube 24 has been described, but instead, the heat exchange inner tube and the guide tube, that is, the end itself of the guide tube 24 is expanded. The locking ring may be formed by bending outward.

Further, in each of the above embodiments, the heat exchange inner cylinder according to the present invention and the indirect coolers 23, 51,.
The fluid containing hydrogen chloride cooled by the
Although the example using the guide tube 24 in which the guide tube leading to the inside of the tube is integrated has been described, the guide tube 24 is divided instead, and the heat exchange inner tube (indirect cooler 23), the guide tube and Can be made independent. In particular, when the above-described locking ring 31 is formed by expanding the end of the guide tube 24 itself and bending it outward, it is necessary to divide the guide tube 24. That is, the end portions of the independent heat exchange inner cylinder and the guide cylinder are expanded and bent outward to form locking rings. Between the flange 25 and the flange 26. in this case,
Even if the locking rings made of tantalum of the heat exchange inner cylinder and the guide cylinder are welded to each other, they may not be welded.

As another mode of mounting the guide cylinder 24 to the fluid supply nozzle 22 when the guide cylinder 24 is divided, similarly to the structure of the lock ring 31 and the flange 26, the lock ring and the flange May be provided, and the locking ring and the flange may be sandwiched between the flange 25 and the flange 26 via a gasket and fixed with a through bolt.

Further, in each of the above-described embodiments, an example is shown in which the indirect coolers 23, 51, and 61 are provided directly on the fluid supply nozzle 22, but it is not particularly necessary to provide the indirect coolers 23 on the fluid supply nozzle 22; Any location upstream of the supply nozzle 22 may be used. However, when it is provided above the fluid supply nozzle 22, the contact portion with the hydrogen chloride-containing fluid downstream from the indirect cooler needs to be tantalum.

In each of the above embodiments, the flanges 26 and 28 are made of carbon steel. However, the flanges 26 and 28 may be made of stainless steel. On the contrary, the stainless steel of the jacket 62 of the third embodiment may be made of stainless steel. May be carbon steel.

[0079]

As described above, according to the first aspect of the present invention,
According to the hydrogen chloride gas absorption device described in the above, by making the indirect cooler for introducing the hydrogen chloride-containing fluid and at least the portion of the guide cylinder that comes into contact with the hydrogen chloride-containing fluid tantalum, the thermal conductivity of tantalum in cooling The height acts synergistically to efficiently cool the hydrogen chloride-containing fluid, and the tantalum itself of the indirect cooler and the guide tube is cooled to suppress a rise in temperature. Is also prevented, and the durability can be greatly improved. Therefore, it is not necessary to replace the indirect cooling unit and the guide cylinder, or the frequency can be greatly reduced.

Since the hydrogen chloride-containing gas is cooled by the indirect cooling, there is no contact between the hydrogen chloride and the cooling refrigerant, so that the cooling water is sprayed on the fluid supply pipe upstream of the indirect cooler. To prevent corrosion of the inner wall of the fluid supply pipe. For example, even when the spray nozzle of the absorbing liquid is installed in the guide cylinder or the heat exchange inner cylinder as in the related art, the indirect cooler is provided to cool the hydrogen chloride-containing fluid. Therefore, the amount of spraying of the absorbing liquid for cooling can be reduced, and the amount of the absorbing liquid scattered to the fluid supply pipe connected to the upper part of the indirect cooler is reduced accordingly, and corrosion of the fluid supply pipe is reduced. Less.

According to the hydrogen chloride gas absorbing device according to the second aspect of the present invention, the refrigerant flows through the cooling pipe wound around the outer peripheral surface of the heat exchange inner cylinder that constitutes the indirect cooler. It is possible to reliably cool the exchange inner cylinder to prevent its temperature from rising, and to prevent hydrogen embrittlement of the heat exchange inner cylinder of tantalum.

According to the hydrogen chloride gas absorbing device of the third aspect of the present invention, an annular structure is provided on the outer periphery of the heat exchange inner cylinder constituting the indirect cooler so as to cover the outer periphery of the heat exchange inner cylinder. By forming a refrigerant flow path by the jacket of the above, by flowing a refrigerant through this refrigerant flow path and directly cooling the heat exchange inner cylinder, the cooling efficiency of the heat exchange inner cylinder made of tantalum is increased,
The effect of suppressing hydrogen embrittlement can be further enhanced.

According to the hydrogen chloride gas absorbing device according to the fourth aspect of the present invention, the flange is made of another inexpensive material by connecting the indirect cooler and the guide tube to the absorption tower via the flange. To reduce costs,
In addition, the indirect cooler and the guide cylinder are configured to be detachable from the absorption tower by a flange, so that maintenance and inspection thereof can be facilitated.

According to the hydrogen chloride gas absorbing device according to the fifth aspect of the present invention, by connecting the indirect cooler and the fluid supply pipe through which the hydrogen chloride-containing fluid is fed through the flange, Is formed from other inexpensive materials to reduce costs, and the indirect cooler has a structure detachable from the absorption tower by a flange,
These maintenance inspections can be facilitated.

According to the hydrogen chloride gas absorbing device of the present invention, the jacket which is arranged around the heat exchange inner cylinder constituting the indirect cooler and forms the refrigerant flow passage is made of stainless steel or carbon. By using steel, the cost of the indirect cooler can be reduced.

According to the hydrogen chloride gas absorbing device of the present invention, by forming the indirect cooler and the guide tube integrally, the cooling action in the indirect cooler extends to the guide tube. As a result, hydrogen embrittlement of tantalum constituting these can be further prevented.

According to the hydrogen chloride gas absorbing device of the present invention, an air layer is formed between the fluid supply nozzle and the guide cylinder by the double pipe structure in which the guide cylinder is inserted inside the fluid supply nozzle. Accordingly, the amount of heat transmitted from the guide cylinder to the fluid supply nozzle is reduced, and even if the inner surface of the fluid supply nozzle is coated with FRP that is weak against high heat, the corrosion resistance of the fluid supply nozzle is increased, As a result, the durability of the absorption tower is improved, and the corrosion resistance of the gas absorption tower is reduced, so that the cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing the first embodiment of the present invention.

FIG. 3 is a partially enlarged longitudinal sectional view of a main part showing the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is a partially enlarged longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

FIG. 7 is a partially enlarged longitudinal sectional view of a main part showing a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 20 ・ 50 ・ 60 Hydrogen chloride-containing gas absorption device 21 Absorption tower 22 Fluid supply nozzle 23 ・ 51 ・ 61 Indirect cooler 24 Guide tube (heat exchange inner tube, guide tube) 25 ・ 26 Flange 29 Cooling pipe 30 Heat insulator 34 FRP Coating layer 52 ・ 62 Jacket B Hydrogen chloride-containing fluid C Cooling channel (refrigerant channel)

Claims (8)

[Claims] 1. A hydrogen chloride gas absorption device for supplying a hydrogen chloride-containing fluid and water into an absorption tower, and absorbing and recovering the water with the hydrogen chloride of the hydrogen chloride-containing fluid. Upstream of the fluid supply nozzle of the absorption tower into which the fluid is sent, an indirect cooler for indirectly cooling the hydrogen chloride-containing fluid to be sent is provided, and inside the fluid supply nozzle, at least the fluid supply nozzle A guide tube is provided which leads from the tip to the inside of the absorption tower and guides the hydrogen chloride-containing fluid cooled by the indirect cooler to the inside of the absorption tower, and a guide tube tip inside the absorption tower from the indirect cooler. A contact portion with the hydrogen chloride-containing fluid, which reaches tantalum, is made of tantalum. 2. The indirect cooler is wound along a heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows and an outer peripheral surface of the heat exchange inner cylinder to cool the hydrogen chloride-containing fluid. The chloride according to claim 1, wherein the cooling pipe is configured to include a cooling pipe through which a cooling medium flows, and a heat insulating material provided to cover the cooling pipe, and the heat exchange inner cylinder is formed of tantalum. Hydrogen gas absorption device. 3. The heat exchanger according to claim 1, wherein the indirect cooler is provided along a heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows, and along an outer periphery of the heat exchange inner cylinder to cool the hydrogen chloride-containing fluid. 2. The hydrogen chloride gas absorption device according to claim 1, wherein the device comprises an annular jacket forming a refrigerant flow path through which the refrigerant flows, and at least the heat exchange inner cylinder is formed of tantalum. 3. . 4. The fluid supply device according to claim 1, wherein the indirect cooler and the guide cylinder are provided with a locking ring made of an annular tantalum from the heat exchange inner cylinder and / or the guide cylinder, and a flange into which the heat exchange inner cylinder is inserted and the fluid supply. 4. The hydrogen chloride gas absorbing device according to claim 2, wherein the device is detachably connected to the fluid supply nozzle by being sandwiched between flanges of the nozzle. 5. A connection between the indirect cooler and a fluid supply pipe into which a hydrogen chloride-containing fluid is fed, wherein a locking ring made of annular tantalum from the heat exchange inner cylinder is inserted into the heat exchange inner cylinder. The hydrogen chloride gas absorbing device according to any one of claims 2 to 4, wherein the device is detachable by being sandwiched between the formed flange and the flange of the fluid supply pipe. 6. The heat exchange inner cylinder through which the hydrogen chloride-containing fluid flows, and the indirect cooler are disposed along the outer periphery of the heat exchange inner cylinder, and the outer peripheral portions at both ends are provided in the heat exchange inner cylinder. An annular jacket forming a refrigerant flow passage through which a refrigerant that cools the hydrogen chloride-containing fluid flows is welded and fixed to each of the flange side surfaces provided in the
The heat exchange inner cylinder is formed of tantalum, and the flange and the jacket are formed of stainless steel or carbon steel. Hydrogen chloride gas absorber. 7. The hydrogen chloride gas absorption device according to claim 1, wherein the heat exchange inner cylinder of the indirect cooler and the guide cylinder are formed integrally. 8. The gas supply tower according to claim 1, wherein the guide cylinder is provided inside the fluid supply nozzle so as to be spaced apart from the fluid supply nozzle, and an inner surface of the fluid supply nozzle of the gas absorption tower is coated with FRP. 8. The hydrogen chloride gas absorption device according to any one of 7.