JPH08245217A - Apparatus for recovering and liquefying gaseous ammonia - Google Patents

Abstract

PURPOSE: To recover the gaseous ammonia led out of processing equipment with high efficiency. CONSTITUTION: The gaseous ammonia led out of a processing chamber 2 of the processing equipment for ammonia having the processing chamber 2 using liquid ammonia and an volatilization chamber 3 connected to the processing chamber 2 is liquefied and the ammonia-contg. gas led out of the volatilization chamber 3 is subjected to an absorption treatment by a water absorbing device 18. The treated water in this water absorbing device 18 which treats the ammonia-contg. gas led out of the evaporation chamber 3 is supplied to an ammonia separating mechanism 40 where the gaseous ammonia component is separated. The separated gaseous ammonia component is supplied to a liquefying mechanism 4 and is liquefied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia recovery liquefaction apparatus for immersing a workpiece such as a cloth in liquid ammonia and subsequently recovering and liquefying ammonia gas from a processing facility for volatilizing ammonia.

[0002]

2. Description of the Related Art It has been known that natural fiber, such as cotton, undergoes a change in crystal structure and fibril arrangement when treated with liquid ammonia to improve properties such as flexibility, shrinkage resistance, wrinkle resistance and strength improvement. That is, in order to subject the natural fiber to shrink-proofing, wrinkle-proofing and the like, the fiber is usually immersed in liquid ammonia in the processing chamber and then the ammonia gas is evaporated by heating.

In such a processing facility, ammonia gas is collected, liquefied, and reused. Conventionally, as the recovery liquefaction device, Japanese Patent Publication No.
Nos. 8-53108 and 4-308267 are known. The recovery liquefaction device disclosed in Japanese Examined Patent Publication No. 58-53108 is arranged in a processing chamber in which a heating tank including a processing tank for storing liquid ammonia and a heating drum is arranged, and in a continuous state with the processing chamber. A processing facility is formed with the volatilization chamber, the ammonia gas discharge path led from the processing chamber is connected to the suction port of the compressor, and the discharge port of this compressor is connected to the condenser to liquefy the ammonia gas and liquefy it. The stored liquid ammonia is temporarily stored in a storage container, and then returned to the processing tank of the processing chamber through the overheat reduction container, and the ammonia gas from the volatilization chamber is sent to an incinerator or other disposal facility for processing. It was done like this.

Further, the recovery liquefaction apparatus disclosed in Japanese Patent Laid-Open No. 4-308267 is a processing chamber in which a heating tank composed of a processing tank for storing liquid ammonia and a heating drum is arranged, and the processing chamber is continuously connected to the processing chamber. The processing equipment is formed with the volatilization chamber that is placed in a state where the ammonia gas discharge path leading from the processing room is connected to the suction port of the compressor, and the discharge port of this compressor is connected to the condenser to discharge the ammonia gas. Liquefaction and store this liquefied liquid ammonia in the ammonia tank,
After that, the gas is returned to the processing tank of the processing chamber via the cooler, and the ammonia gas from the volatilization chamber is sent to the scrubber for processing.

[0005]

In any of the above-mentioned conventional liquefaction recovery apparatuses, since the mixed concentration of ammonia gas in the volatilization chamber is low, the ammonia gas from this volatilization chamber is processed and discarded. Therefore, there is a problem that the efficiency of ammonia recovery is low. In view of such a point, the present invention aims to recover ammonia gas discharged from a processing facility with high efficiency.

[0006]

In order to achieve the above-mentioned object, the present invention comprises a liquefying device in which a blower, a cooler and a condenser are arranged in series to treat ammonia gas from a volatilization chamber. It is characterized in that the treated water lead-out path led out from the water absorption device is connected to an ammonia separation mechanism, and the ammonia gas generated by this ammonia separation mechanism is supplied to the cooler of the liquefaction device.

[0007]

In the present invention, the ammonia gas from the volatilization chamber is absorbed into water by the water absorption device to form ammonia water, and this ammonia water is supplied to the ammonia separation mechanism to separate high-concentration ammonia gas, which is then separated. Ammonia gas is supplied to the cooler of the liquefaction device to be liquefied. As a result, the ammonia gas component in the volatilization chamber, which has been conventionally disposed of, can be liquefied and recovered, and the recovery efficiency of ammonia is improved.

When the water separated by the ammonia separation mechanism is returned to the ammonia gas water absorption device as described in claim 3, the treated water containing the ammonia component which cannot be completely separated by the ammonia separation mechanism is newly added. Since a large amount of ammonia gas is absorbed, the ammonia component in the treated water is concentrated, and the efficiency of ammonia recovery can be further improved.

As described in claims 4 to 7, a plurality of absorption towers are arranged in series to constitute a water absorption device, and the gas discharged from the volatilization chamber or the gas discharged from the seal box or the liquefaction mechanism (4 When the exhaust gas from () is introduced into the water absorption device by selecting the absorption tower according to the gas concentration, the ammonia absorption in the absorption tower can be performed efficiently, and the recovery efficiency of the ammonia component is improved. Will be improved.

Further, when the exhaust gas from the water absorbing device and the exhaust gas from the seal box containing a large amount of atmospheric components are processed by the neutralization processing device, the exhaust gas is discharged. It can be disposed of in a harmless state.

Furthermore, as described in claims 9 and 10, blowers are respectively arranged in the ammonia gas discharge passage from the volatilization chamber and the leak gas discharge passage from the seal box, and the suction force of the blower causes the volatilization chamber and The pressure inside the seal box is maintained at a predetermined negative pressure, and an opening control valve is placed in each of the ammonia gas discharge path from the volatilization chamber and the leak gas discharge path from the seal box, and is also placed on the upstream side of each blower. When each of the air intake valves is arranged, the responsiveness to pressure fluctuations in the volatilization chamber and the seal box can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings are schematic system diagrams showing an embodiment of the present invention. This ammonia gas recovery liquefaction device is a casing
A processing chamber (2) for shrink-proof and wrinkle-proof processing of natural fibers is formed in (1) to form a volatilization chamber (3), and the ammonia gas derived from the processing chamber (2) during steady operation is recovered and liquefied. It has a liquefaction mechanism (4) for controlling and a treatment mechanism (5) for treating the ammonia gas derived from the volatilization chamber (3) during steady operation.

In the processing chamber (2), a processing tank (6) for storing liquid ammonia and a drying device (7) formed by a heating drum.
And natural fibers (A) such as cotton continuously supplied in the casing (1) in the processing chamber (2).
After being dipped in the liquid ammonia in (6) and subjected to shrink-proof / wrinkle-proof processing, it is made to act on the drying device (7) to vaporize and evaporate most of the liquid ammonia adhering to the natural fiber (A). I am doing it.

The natural fiber (A) in which most of the ammonia component is vaporized and evaporated in the processing chamber (2) is introduced into the volatilization chamber (3) after the processing chamber (2). In this volatilization chamber (3), natural fiber
The vapor is applied to (A) to gasify and remove the ammonia component remaining in the fiber.

A processing chamber formed in the casing (1)
A seal box (8) is placed at the processed product inlet to (2) and the processed product outlet from the volatilization chamber (3) to prevent outflow of ammonia gas and air, Room (2)
And the volatilization chamber (3), the two chambers (2)
A seal box (8) is arranged to prevent ammonia gas and vapor from coming and going between (3).

Ammonia gas recovery path from the processing room (2)
(9) is led out, and this ammonia gas recovery path (9) is connected to the liquefaction mechanism (4) via the buffer chamber (10). This liquefaction mechanism (4) was cooled by a blower (11) for sucking and discharging ammonia gas, a cooler (12) for cooling the ammonia gas discharged from this blower (11), and a cooler (12). It is composed of a condenser (13) for liquefying ammonia gas, and a refrigerant pipe of a refrigerator (14) is arranged inside the condenser (13). And, from this condenser (13), a liquid ammonia extraction passage (16) in which a liquid ammonia transfer pump (15) is arranged is led out, and this liquid ammonia outlet passage (16) is connected to the processing chamber.
It is connected to the processing tank (6) (2). In addition, instead of the liquefied ammonia transfer pump (15), the condenser (13) and the processing tank
It is conceivable that a height difference is provided between (6) and gravity so that it can be poured.

Further, an ammonia-containing gas lead-out path (17) is led out from the volatilization chamber (3), and the ammonia-containing gas lead-out path (17) communicates with the water absorbing device (18). And
A blower (20) is arranged in the exhaust passage (19) that is connected to the water absorbing device (18) so that the suction force of the blower (20) sucks and discharges the ammonia gas from the volatilization chamber (3). There is. The exhaust passage (19) is connected to the neutralization processing device (21), and the ammonia gas that cannot be completely absorbed by the water absorption device (18) is brought into contact with an acid such as sulfuric acid for neutralization processing. . An air intake valve (22) is arranged on the water absorption device (18) side of the blower (20) in the exhaust passage (19) in order to keep the inside of the volatilization chamber (3) at a negative pressure within a certain range. It is set up. By interlocking the air intake valve (22) with a pressure adjusting mechanism (not shown) of the volatilization chamber (3), pressure control with high responsiveness becomes possible.

Further, a leak gas take-out path (23) extends from each seal box (8) of the casing (1),
This leak gas take-out path (23) is the neutralization processing device (21).
Connected to If the ammonia gas concentration in the leak gas in the seal box (8) is high, the leak gas extraction path (in order to introduce the leak gas into the water absorbing device (18) to recover the ammonia gas component ( 2
The water absorbing device (18) and the water absorbing device (18) are connected to each other via a flow path shutoff valve that opens and closes by detecting the gas concentration. A blower (24) is provided in the leak gas extraction passage (23), and the pressure in each seal box (8) is kept within a certain range on the seal box (8) side of the blower (24). An air intake valve (25) for maintaining the pressure state is arranged. By interlocking the air intake valve (25) with the pressure adjusting mechanism (not shown) of the seal box (8), pressure control with high responsiveness becomes possible.

In the figure, reference numeral (26) is a treated water lead-out passage which is continuously provided from the water absorbing device (18), and the treated water lead-out passage (26) is connected to the ammonia separation mechanism (40). The ammonia separation mechanism (40) includes a treated water storage tank (28) arranged in the treated water outlet (26), a treated water transfer pump (29), and a treated water transfer pump (29).
A distillation apparatus (27) connected to the, a partial condenser (39) for cooling the ammonia gas distilled by the distillation apparatus (27), and a heat exchanger (30) for cooling the treated water from which the ammonia gas has been separated. It is composed of. And this ammonia separation mechanism (40)
Introduces the treated water, which has become ammonia water by absorbing ammonia in the water absorption device (18), into the distillation device (27) to vaporize and separate the ammonia gas component from the ammonia water, and to decompress the separated ammonia gas. It is introduced into the cooler (12) of the liquefaction mechanism (4) through the vessel (39) and liquefied for recovery. On the other hand, the treated water from which most of the ammonia component was released in the distillation device (27) was used in the heat exchanger (3
After cooling in (0), return to the water absorption device (18) and
It is reused for the ammonia gas absorption treatment from (3).

Reference numeral (31) is an ammonia replenishment container, and this replenishment container (31) is connected to the condenser (13), and the replenishment container (3)
Ammonia introduced from 1) is condensed and liquefied in the condenser (13), and it is collected and liquefied together with liquid ammonia.
It is supplied to the processing tank (6) of (2). In addition, in order to maintain the pressure in the processing chamber (2) in a negative pressure atmosphere within a certain range, bypass the blower (11) downstream side of the liquefied gas recovery passageway (9) and the upstream side of the buffer chamber (10). A bypass valve (33) is attached to the bypass passage (32).

Further, the processing chamber (2) is provided with an ammonia gas supply passage (34) for recovering the pressure in the processing chamber (2) when the pressure in the processing chamber (2) suddenly drops, Nitrogen gas supply line (3) to replace the air in the processing room (2) when starting the processing equipment or to replace the ammonia gas when the processing equipment is stopped.
5) is connected. Then, in order to process the gas discharged at the time of this replacement, an ammonia gas recovery passage (9) continuously provided from the processing chamber (2) and an ammonia-containing gas discharge passage continuously provided from the volatilization chamber (3). The communication passage (36) is connected to (17), and the switching valve (37) is arranged in this communication passage (36).

Therefore, when the processing equipment is stopped, the processing room
When the inside of (2) is replaced with nitrogen, the switching valve (37) is opened with the blower (11) of the liquefaction mechanism (4) stopped, so that the ammonia gas in the processing chamber (2) is The water absorption device (18) is sent together with the nitrogen gas for processing. Further, the processing chamber (2) is provided with a safety valve device (38) which operates when the pressure in the processing chamber (2) fluctuates and becomes higher or lower than a predetermined pressure range. The ammonia gas discharged when the device (38) operates on the high pressure side is detoxified by a processing device (not shown). When the safety valve device (38) operates on the low pressure side, the atmosphere is taken into the processing chamber (2).

In the ammonia liquefaction and recovery apparatus having the above-mentioned structure, a part of the gas from the discharge port of the blower (11) of the liquefaction mechanism (4) is returned to the buffer chamber (10) side, so that the processing chamber
The suction force of the blower (11) that acts on the processing chamber (2) such that the internal pressure of (2) becomes a low pressure (negative pressure) or high pressure (positive pressure) of several mm to several tens of mm in the water column rather than atmospheric pressure. Adjust the water absorption device (1
8) The air intake valve (22) located upstream of the blower (20) located in the exhaust passage (19)
The blower (2) that acts on the volatilization chamber (3) so that the internal pressure of (3) becomes a low pressure (negative pressure) of several mm to several tens of mm in the water column rather than atmospheric pressure.
Adjusting the suction force of 0).

Further, the internal pressure in the seal box (8) is controlled by the air intake valve (25) arranged on the upstream side of the blower (24) in the leak gas take-out path (23) so that the processing chamber (2) and the volatilization chamber (3) can be controlled. The suction force of the blower (24) acting on the seal box (8) is adjusted so as to be maintained at a pressure lower than the internal pressure of (). As a result, the air that flows from the atmosphere and the ammonia gas that leaks from the processing chamber (2) and the volatilization chamber (3) are placed on the casing wall surface that separates the chambers (2) and (3) from the outside. Sealed Box (8a) (8b)
To the neutralization processing device (21). Further, in the seal box (8c) arranged on the partition wall between the processing chamber (2) and the volatilization chamber (3), the high-concentration ammonia gas in the processing chamber (2) and the vapor in the volatilization chamber (3) are stored. Since the mixed low-concentration ammonia gas will flow in, this mixed gas is also neutralized by the water absorption device (18) or the neutralization processing device (21).

The ammonia gas in the processing chamber (2) has a high concentration with almost no impurities mixed therein, which is vaporized from the processing tank (6) and vaporized by heating in the drying device (7). Since it is ammonia gas, this ammonia gas is liquefied by the ammonia gas recovery path (9).
The liquid ammonia is supplied to (4) and liquefied, and the liquefied liquid ammonia is returned to the processing tank (6) in the processing chamber (2).

On the other hand, in the volatilization chamber (3), the fibers are vaporized.
Since the ammonia component adhering to (A) is evaporated and vaporized, the inside of the volatilization chamber (3) is a low-concentration ammonia gas atmosphere in which a large amount of vapor is mixed with ammonia gas,
Ammonia gas in this volatilization chamber is not suitable for direct recovery and liquefaction. Therefore, once the ammonia component in the volatilization chamber (3) is absorbed and removed by the water absorption device (18), the water absorption device is removed.
The treated water from (18) is separated by distillation with an ammonia separation mechanism,
The separated ammonia gas is supplied to the liquefaction mechanism (4) for recovery and liquefaction.

Ammonia components are slightly dissolved in the treated water from which the ammonia gas has been separated by the distillation apparatus (27). Since the treated water in which the ammonia component is slightly dissolved does not hinder the operation of absorbing the ammonia gas from the volatilization chamber, the treated water containing the ammonia component is absorbed by the water absorption device (18).
It will be returned to and reused. Then, by returning the treated water from the distillation device (27) to the water treatment device (18), the slightly dissolved ammonia component is volatilized in the volatilization chamber.
The distillation apparatus (27) can be removed together with the ammonia gas from (3). Then, the ammonia gas that cannot be completely removed by the water absorption device (18) is neutralized with an acid by the neutralization processing device (21) and then discarded.

In the above embodiment, the water absorbing device (1
Although a scrubber is used as 8), a plurality of scrubbers may be connected in series depending on the concentration of ammonia in the gas or the concentration of ammonia water to be obtained. In that case, the leakage gas from the seal box (8), the exhaust gas from the liquefaction mechanism (4), or the gas discharged from the processing chamber (2) or the volatilization chamber (3) during unsteady operation is used as the ammonia gas. If it is introduced into an appropriate scrubber depending on the concentration, the recovery efficiency of ammonia gas can be further enhanced.

[0029]

According to the present invention, the ammonia gas from the processing chamber is recovered and liquefied, and the ammonia gas from the volatilization chamber is absorbed by water in the water treatment device to form ammonia water. The ammonia gas component in the volatilization chamber, which has been conventionally disposed of, is liquefied by supplying it to the condenser of the liquefaction mechanism to liquefy it. Can also be liquefied and recovered, which improves the ammonia recovery efficiency.

Further, by supplying the ammonia gas separated by the ammonia separation mechanism to the cooler of the liquefaction mechanism, the ammonia separation mechanism can be purified to a purity that can be purified by the liquefaction mechanism. The operating conditions of the device are gauge pressure of less than ² kg / cm ² and temperature of 20.
It can be operated at a low pressure / low temperature of less than 0 ° C., and workability can be improved.

When the water separated by the ammonia separation mechanism is returned to the ammonia gas water treatment device,
Ammonia separation mechanism absorbs new ammonia gas with the treated water containing the ammonia component that could not be completely separated, so the ammonia component in the treated water is concentrated and the efficiency of ammonia recovery is further improved. It will be possible.

Furthermore, when the neutralized water treatment apparatus treats the exhaust gas from the water treatment apparatus and the gas discharged from the seal box containing a large amount of atmospheric components, the exhaust gas is discarded in a detoxified state. You can

[Brief description of drawings]

FIG. 1 is a schematic system diagram showing an embodiment of the present invention.

[Explanation of symbols]

2 ... processing chamber, 3 ... volatilization chamber, 4 ... liquefaction mechanism, 6 ... processing tank,
7 ... Drying device, 8 ... Seal box, 9 ... Ammonia gas recovery path, 11 ... Blower, 12 ... Cooler, 13 ... Condenser, 18 ...
Water absorption device, 20/24 ... Blower, 21 ... Neutralization treatment device, 22
・ 25 ... Air intake valve, 23 ... Leak gas removal passage, 26 ... Treated water outlet passage, 27 ... Distillation device, 29 ... Treated water transfer pump, 30
… Heat exchanger, 39… Decompressor, 40… Ammonia separation mechanism.

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[Procedure amendment]

[Submission date] March 24, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia recovery liquefaction apparatus for immersing a workpiece such as cloth in liquid ammonia and subsequently recovering and liquefying ammonia gas from a processing facility for volatilizing ammonia. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Further, a leak gas take-out path (23) extends from each seal box (8) of the casing (1),
This leak gas take-out path (23) is the neutralization processing device (21).
Connected to In addition, when the ammonia gas concentration in the leak gas in the seal box (8) is high, in order to allow the ammonia gas component to be recovered by introducing the leak gas into the water absorbing device (18), the leak gas extraction path ( 2
The water absorbing device (18) and the water absorbing device (18) are connected to each other via a flow path shutoff valve that opens and closes by detecting the gas concentration. A blower (24) is provided in the leak gas extraction passage (23), and the pressure in each seal box (8) is kept within a certain range on the seal box (8) side of the blower (24). An air intake valve (25) for maintaining the pressure state is arranged. By interlocking the air intake valve (25) with the pressure adjusting mechanism (not shown) of the seal box (8), pressure control with high responsiveness becomes possible.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Furthermore, by supplying ammonia gas separated by the ammonia separation mechanism cooler liquefaction mechanism, since the ammonia separation mechanism it is sufficient to purify until a possible purification in the liquefaction mechanism purity distillation with ammonia separation mechanism The operating conditions of the device are gauge pressure of less than ² kg / cm ² and temperature of 20.
It can be operated at a low pressure / low temperature of less than 0 ° C., and workability can be improved.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F25J 1/00 B01D 53/34 131 (72) Inventor Nobuo Date 3-4 Hommachi, Chuo-ku, Osaka-shi, Osaka No. 8 Iwatani Sangyo Co., Ltd. (72) Inventor Koji Okamoto 3-4-8 Hommachi, Chuo-ku, Osaka City, Osaka Prefecture Iwatani Sangyo Co., Ltd.

Claims (10)

[Claims] 1. A processing chamber (2) accommodating a processing tank (6) for storing liquid ammonia and a drying device (7), and this processing chamber.
The ammonia gas recovery path (9) is led out from the processing room (2) of the processing facility for ammonia having the liquid ammonia volatilization room (3) continuous to (2), and this ammonia gas recovery path
(9) was connected to the liquefaction mechanism (4), and the liquid ammonia liquefied by this liquefaction mechanism (4) was supplied to the processing tank (6) in the processing chamber (2) and was discharged from the volatilization chamber (3). In the ammonia gas recovery liquefaction device in which the ammonia-containing gas is supplied to the water absorption device (18) to be absorbed by the treated water, the liquefaction mechanism (4) includes a blower (11), a cooler (12), and a condenser. (13)
Are arranged in series, and the treated water outlet (26) derived from the water absorber (18) for treating the ammonia-containing gas from the volatilization chamber (3) is connected to the ammonia separation mechanism (40). An ammonia gas recovery liquefaction device characterized in that the ammonia gas generated in the ammonia separation mechanism (40) is supplied to the cooler (12) of the liquefaction mechanism (4). 2. The ammonia separation mechanism (40) has a treated water transfer pump (29), a distillation device (27), a partial condenser (39), and a heat exchanger (30), and a water absorption device. The ammonia gas recovery liquefaction apparatus according to claim 1, which separates high-concentration ammonia gas from the treated water from (18). 3. A water treatment device for treating treated water from which ammonia gas has been removed by an ammonia separation mechanism (40) via a heat exchanger (30).
The ammonia gas recovery liquefaction apparatus according to claim 1 or 2, which is returned to (18). 4. A water absorption device (18) is constructed by arranging a plurality of absorption towers in series, and a gas discharged from the volatilization chamber (3) is supplied to the water absorption device (18) according to its ammonia gas concentration. The ammonia gas recovery liquefaction apparatus according to any one of claims 1 to 3, wherein an absorption tower is selected and introduced. 5. A water absorption device (18) is constructed by arranging a plurality of absorption towers in series, and the exhaust gas from the liquefaction mechanism (4) is supplied to this water absorption device (18) according to its ammonia gas concentration. The ammonia gas recovery liquefaction apparatus according to any one of claims 1 to 4, wherein an absorption tower is selected and introduced. 6. A water absorbing device (18) is constructed by arranging a plurality of absorption towers in series, and the water absorbing device (18) communicates with each workpiece in the processing chamber (2) and the volatilization chamber (3). A gas derived from a seal box (8) arranged at a mouth part is introduced by selecting an absorption tower according to its ammonia gas concentration.
The ammonia gas recovery liquefaction apparatus according to claim 5. 7. A water absorbing device (18) is constructed by arranging a plurality of absorption towers in series, and the gas discharged from the processing chamber (2) is supplied to this water absorbing device (18) according to its ammonia gas concentration. The ammonia gas recovery liquefaction apparatus according to any one of claims 1 to 6, wherein an absorption tower is selected and introduced. 8. The exhaust gas from the water absorption device (18) is introduced into the neutralization processing device (21), and the processing chamber (2) and the volatilization chamber are also provided.
Seal box placed in each workpiece communication port of (3)
The ammonia gas recovery liquefaction device according to any one of claims 1 to 7, wherein the gas discharged from the seal boxes (8a) (8b) arranged at least on the outer wall portion of the (8) is introduced into the neutralization treatment device (21). . 9. A blower (20) is arranged in series with a water absorbing device (18), and the suction force of this blower (20) maintains the pressure in the volatilization chamber (3) at a predetermined negative pressure state. Configured in a volatilization chamber
An opening control valve is installed in the middle of the ammonia-containing gas discharge path (17) derived from (3), and an air intake valve (22) is arranged near the suction port of the blower (20). The ammonia gas recovery liquefaction device according to claim 8. 10. A blower (24) is arranged in a leak gas extraction passage (23) from the seal box (8),
The inside of the seal box (8) is maintained at a predetermined negative pressure state by the suction force at (24), and the leak gas extraction passage (23) is formed.
9. The ammonia gas according to claim 6 or 8, wherein the opening control valve is arranged upstream of the blower (24) and the air intake valve (25) is arranged near the suction port of the blower (24). Recovery liquefaction device.