JP3020825U - Ammonia gas collector for processing equipment using ammonia - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To suppress unnecessary consumption of excess ammonia gas in a processing facility using ammonia. A processing chamber (2) accommodating a processing tank (6) for storing liquid ammonia and a liquid ammonia volatilization chamber (3) continuous with the processing chamber (2) are provided. 2) A processing facility using ammonia that is configured to recover and liquefy the ammonia gas generated in (2). Processing room (2) and volatilization room
(3) and the gas storage chambers (40) (43) installed outside the processing equipment are connected by gas outlet pipes (39) (42), respectively. Each of the gas outlet pipes (39) (42) is provided with a pressure opening / closing valve (38) (41) which opens when the internal pressures of the processing chamber (2) and the volatilization chamber (3) are out of the allowable pressure range. Excess ammonia gas generated in the processing chamber (2) and the volatilization chamber (3) is collected in the gas storage chambers (40) (43).

Description

[Detailed description of the device]

[0001]

[Field of Invention]

 The present invention relates to a device for collecting ammonia gas in a processing facility in which a workpiece such as cloth is dipped in liquid ammonia and then volatilizes the ammonia, and particularly, the ammonia gas generated in the processing facility is collected and liquefied. The present invention relates to a device for collecting surplus ammonia gas in a device that is operated.

[0002]

[Prior art]

 It is known that natural fiber, such as cotton, undergoes changes in crystal structure and fibril arrangement when treated with liquid ammonia, and can be improved in properties such as flexibility, shrinkage resistance, wrinkle resistance, and strength improvement. That is, in order to subject the natural fiber to shrink-proofing and wrinkle-proofing, the fiber is usually immersed in liquid ammonia in the processing chamber, and then ammonia gas is evaporated by heating.

As such a processing facility, a processing chamber in which a processing tank for storing liquid ammonia and a heating device composed of a heating drum are arranged, and a volatilization chamber is arranged in a continuous state with the processing chamber, The ammonia gas discharge path derived from is connected to the suction port of the compressor, the discharge port of this compressor is connected to the condenser to liquefy the ammonia gas, and the liquefied liquid ammonia is returned to the processing tank. Ammonia gas from the volatilization chamber is sent to an incinerator or scrubber for processing.

In this type of processing equipment, the processing chamber and the volatilization chamber are maintained at a pressure lower than the atmospheric pressure to prevent ammonia from leaking from the processing equipment. However, due to some reason, the amount of ammonia generated in the processing room is reduced. If the liquefaction capacity of the liquefaction device rapidly increases and cannot keep up with this, ammonia gas will leak from the processing equipment. Therefore, conventionally, as shown in Japanese Patent Application Laid-Open No. 4-308267, when the amount of ammonia generated in a processing chamber exceeds an allowable upper limit amount, ammonia gas is sent to a scrubber processing ammonia gas from a volatilization chamber. I am trying to process it.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one, since the surplus ammonia gas in the processing chamber is processed by the scrubber, there is a problem that the excess ammonia gas is consumed, and the ammonia in the processing chamber is Since its concentration is higher than that of the above, if the surplus ammonia gas in the processing chamber temporarily flows into the scrubber, the processing capacity here cannot keep up and the ammonia gas is released in a state where it is not completely processed. On the other hand, if the scrubber is set in anticipation of the surplus ammonia gas inflow, a scrubber with a large capacity is required, which not only requires a large installation area but is economically wasteful. there were. In view of such a point, the present invention aims to suppress the wasteful consumption of the ammonia gas by collecting the surplus ammonia gas discharged from the processing equipment in the gas storage chamber.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention connects a processing chamber and a volatilization chamber to a gas storage chamber installed outside the processing equipment by gas discharge pipes, and connects each gas discharge pipe to the processing chamber and the volatilization chamber. The feature is that each of them is equipped with a pressure on-off valve that opens when the internal pressure deviates from the allowable pressure range.

[0007]

[Action]

 According to the present invention, the processing chamber and the volatilization chamber are connected to the gas storage chamber installed outside the processing facility by gas outlet pipes, respectively, and when the internal pressure of the processing chamber and the vaporizer chamber is out of the allowable pressure range for each gas outlet pipe. Since each pressure opening / closing valve is opened, for example, if ammonia gas that exceeds the liquefaction capacity of the liquefaction device is generated in the processing chamber and the pressure in the processing chamber exceeds the allowable pressure, the pressure switching The valve opens to feed the gas in the processing chamber into the gas storage chamber. Then, when the pressure in the processing chamber falls to the allowable pressure range, the pressure on-off valve is closed to return to the normal capacity operating state. At this time, the ammonia gas extracted from the processing chamber is stored in the gas storage chamber. When the pressure in the processing chamber becomes lower than the allowable pressure, the pressure opening / closing valve closes and the ammonia gas in the gas storage chamber is sent to the processing chamber.

[0008]

[Embodiment of device]

 The drawings are schematic system diagrams showing an embodiment of the present invention. This ammonia gas recovery liquefaction device is formed by dividing a processing chamber (2) for shrink-proofing and wrinkle-proofing of natural fibers into a casing (1) and a volatilization chamber (3). It has a liquefaction mechanism (4) for recovering and liquefying the ammonia gas derived from 2) 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 are arranged, and the casing (1) is continuously connected. The natural fiber (A) such as cotton supplied to the machine is soaked in the liquid ammonia in the processing tank (6) in the processing chamber (2) for processing, and then it is made to act on the drying device (7) to perform natural processing. Most of the liquid ammonia that permeates the fiber (A) is vaporized and evaporated.

The natural fiber (A) in which most of the ammonia components have been 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), steam is applied to the natural fiber (A) to gasify and remove the ammonia component remaining in the fiber.

Then, the outflow of the ammonia gas and the inflow of the atmosphere are prevented at the processed product inlet to the processing chamber (2) formed in the casing (1) and the processed product outlet from the volatilization chamber (3). For this reason, a seal box (8) is arranged, and the communication port formed between the processing chamber (2) and the volatilization chamber (3) also has ammonia gas and steam between the chambers (2) and (3). A seal box (8) is placed to prevent the car from coming and going.

An ammonia gas recovery passageway (9) is led out from the processing chamber (2), and the ammonia gas recovery passageway (9) is connected to the liquefaction mechanism (4) via a buffer chamber (10). . This liquefaction mechanism (4) was cooled by a blower (11) that sucks and discharges ammonia gas, a cooler (12) that cools 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). A liquid ammonia extraction passage (16) in which a liquid ammonia transfer pump (15) is arranged is led out from the condenser (13), and the liquid ammonia lead-out passage (16) is connected to the processing tank of the processing chamber (2). It is connected to (6). It is also conceivable to replace the liquefied ammonia transfer pump (15) with a height difference between the condenser (13) and the processing tank (6) so that the liquid is fed by gravity.

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 a water absorbing device (18). Then, the blower (20) is arranged in the exhaust passage (19) which is continuously fed from the water absorbing device (18), and the suction force of the blower (20) sucks and discharges the ammonia gas from the volatilization chamber (3). It is. The exhaust passage (19) is connected to the neutralization processing device (21) so that 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. There is. An air intake valve (22) is installed 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 the pressure adjusting mechanism (not shown) of the volatilization chamber (3), pressure control with quick response becomes possible.

Further, a leak gas take-out path (23) is continuous from each seal box (8) of the casing (1), and the leak gas take-out path (23) is connected to the neutralization treatment device (21). There is. In addition, if the ammonia gas concentration in the leak gas in the seal box (8) is high, the leak gas take-out path is introduced so that the leak gas can be introduced into the water absorption device (18) to recover the ammonia gas component. The water absorbing device (18) is connected to the water absorbing device (18) 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) is arranged to maintain the pressure. By interlocking the air intake valve (25) with the pressure adjusting mechanism (not shown) of the seal box (8), pressure control with quick response becomes possible.

Reference numeral (26) in the figure denotes a treated water outlet passage that extends from the water absorber (18), and this treated water outlet passage (26) is connected to an ammonia separation mechanism (27). This ammonia separation mechanism (27) is a distillation connected to the treated water storage tank (28), the treated water transfer pump (29), and the treated water transfer pump (29) arranged in the treated water outlet (26). It comprises a device (30), a partial condenser (31) for cooling the ammonia gas distilled and separated by the distillation device (30), and a heat exchanger (32) for cooling the treated water from which the ammonia gas has been separated. The ammonia separation mechanism (27) then introduces the treated water, which has become ammonia water by absorbing the ammonia in the water absorption device (18), into the distillation device (30) to vaporize and separate the ammonia gas component from the ammonia water. Then, the separated ammonia gas is introduced into the cooler (12) of the liquefaction mechanism (4) through the partial condenser (31) to liquefy it. On the other hand, the treated water that has released most of the ammonia component in the distillation device (30) is cooled in the heat exchanger (32) and then returned to the water absorption device (18) to remove it from the volatilization chamber (3). It is designed to be reused for ammonia gas absorption treatment.

Reference numeral (33) is a replenishment container for ammonia, and this replenishment container (33) is connected to the condenser (13), and the ammonia introduced from the replenishment container (33) is condensed in the condenser (13). It is supplied to the processing tank (6) of the processing chamber (2) together with the liquefied and recovered liquefied liquid ammonia. Further, in order to maintain the pressure in the processing chamber (2) in a negative pressure atmosphere within a certain range, the downstream side of the blower (11) and the upstream side of the buffer chamber (10) of the liquefied gas recovery passageway (9) are connected. They are connected by a bypass path (34), and a bypass valve (35) is attached to this bypass path (34).

In this ammonia liquefaction recovery device, by returning a part of the gas from the blower (11) discharge port of the liquefaction mechanism (4) to the buffer chamber (10) side, the internal pressure of the processing chamber (2) is reduced. Adjust the suction force of the blower (11) that acts on the processing chamber (2) so that the pressure 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, An air intake valve (22) arranged on the upstream side of a blower (20) arranged in an exhaust passage (19) connected to the water absorption device (18) makes the internal pressure of the volatilization chamber (3) higher than the atmospheric pressure. The suction force of the blower (20) acting on the volatilization chamber (3) is adjusted to a low pressure (negative pressure) of several mm to ten and several mm.

Then, 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 extraction passageway (23) so that the internal pressure in the processing chamber (2) and the volatilization chamber (3 The suction force of the blower (24) acting on the seal box (8) is adjusted so that it is maintained at a pressure lower than the internal pressure of (). As a result, the air that flows in from the atmosphere and the ammonia gas that leaks from the processing chamber (2) and the volatilization chamber (3) respectively separate the chambers (2) and (3) from the outside. It flows into the seal boxes (8a) and (8b) arranged on the wall surface, and is supplied to the neutralization processing device (21) from here. 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).

Further, in the processing chamber (2), an ammonia gas supply passage (36) for recovering the pressure in the processing chamber (2) when the pressure in the processing chamber (2) suddenly drops, A nitrogen gas supply path (37) is connected to replace air in the processing chamber (2) when the processing equipment is started up or to replace ammonia gas when the processing equipment is stopped.

Further, the processing chamber (2) has a pressure opening / closing valve that operates when the pressure in the processing chamber (2) fluctuates to become higher or lower than a predetermined pressure range (allowable pressure range). (38) is provided, and the pressure in the processing chamber (2) becomes higher than the allowable pressure range and the ammonia gas discharged by operating the pressure on-off valve (38) is discharged through the gas outlet pipe (39). The gas is stored in the gas storage chamber (40) via the When the pressure opening / closing valve (38) becomes lower than the allowable pressure range and the pressure opening / closing valve (38) is activated, the ammonia gas stored in the gas storage chamber (40) is stored in the processing chamber (2). ).

On the other hand, when the pressure in the volatilization chamber (3) fluctuates and becomes higher or lower than a predetermined pressure range (allowable pressure range), the pressure opening / closing valve ( 41) is installed, and the ammonia-steam mixture discharged when the pressure in the volatilization chamber (3) is higher than the allowable pressure and is discharged through the gas outlet pipe (42). 43).

The two gas storage chambers (40) (43) are formed by gas bags, and the stored gas is stored by the volume change, and the processing chamber (2) or the volatilization chamber (3) is stored. It is designed to allow gas to flow in and out by changing the internal pressure.

In the above-mentioned ammonia processing equipment, the ammonia gas in the processing chamber (2) is impure due to being evaporated from the processing tank (6) and vaporized by heating in the drying device (7). Since it is a high-concentration ammonia gas that contains almost no substances, this ammonia gas is supplied to the liquefaction mechanism (4) by the ammonia gas recovery passageway (9) and liquefied, and this liquefied liquid ammonia is processed. It is configured to return to the processing tank (6) in the chamber (2).

On the other hand, in the volatilization chamber (3), the ammonia component that has permeated the fibers (A) is vaporized by the vapor, so that in the volatilization chamber (3), a large amount of vapor is mixed with ammonia gas. It is a low-concentration ammonia gas atmosphere, and the ammonia gas in this volatilization chamber is not suitable for direct recovery and liquefaction. Therefore, the ammonia component in the volatilization chamber (3) is once absorbed and removed by the water absorption device (18), and the treated water from the water absorption device (18) is distilled and separated by the ammonia separation mechanism to separate the separated ammonia gas. Is supplied to the liquefaction mechanism (4) for recovery and liquefaction.

A little ammonia component is dissolved in the treated water from which the ammonia gas has been separated by the distillation apparatus (30). The treated water containing the slightly dissolved ammonia component does not hinder the operation of absorbing ammonia gas from the volatilization chamber, so the treated water containing the ammonia component is returned to the water absorption device (18) and reused. I am doing it. Then, by returning the treated water from the distillation device (30) to the water treatment device (18), the slightly dissolved ammonia component can be removed together with the ammonia gas from the volatilization chamber (3). it can. Then, the ammonia gas that cannot be completely removed by the water absorption device (18) is neutralized with an acid by the neutralization treatment device (21) and then discarded.

Although a scrubber is used as the water absorbing device (18) in the above embodiment, a plurality of scrubbers are connected in series according to the concentration of ammonia in the gas or the concentration of ammonia water to be obtained. You may do it. In that case, the leak 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 ammonia gas. If it is introduced into an appropriate scrubber depending on the concentration, the recovery efficiency of ammonia gas can be further improved.

In the above-described embodiment, the tip of the gas outlet path (39) led out from the processing chamber (2) via the pressure opening / closing valve (38) and the vaporization chamber (3) via the pressure opening / closing valve (41). Although the gas storage chambers (40) (43) were individually arranged at the tip of the gas discharge passage (42) that was led out, both gas discharge passages (39) (42) were connected to the common gas storage chamber. You may do it.

[0028]

[Effect of device]

 According to the present invention, the processing chamber and the volatilization chamber are connected to the gas storage chamber installed outside the processing facility by gas outlet pipes, and the internal pressure of the processing chamber and the vaporizer chamber is out of the allowable pressure range for each gas outlet pipe. Since the pressure opening / closing valve for opening the valve is installed, if the internal pressure of the processing chamber or the vaporization chamber exceeds the allowable pressure, the pressure opening / closing valve operates to open the processing chamber or the volatilization chamber. The ammonia gas is sent to the gas storage chamber and collected. As a result, a large amount of ammonia gas will not flow into the ammonia gas treatment facility, so that untreated ammonia gas will not be released or more scrubbers will not be installed.

Furthermore, when the pressure in the processing chamber or the volatilization chamber becomes lower than the allowable pressure, ammonia gas is returned from the gas storage chamber to the processing chamber or the volatilization chamber. It is possible to suppress the contamination in the processing equipment caused by sucking the air into the interior.

[Brief description of drawings]

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

FIG. 2 is a schematic system diagram showing another embodiment of the present invention.

[Explanation of symbols]

2 ... processing chamber, 3 ... volatilization chamber, 6 ... processing tank, 38/41 ... pressure on / off valve, 39/42 ... gas outlet pipe, 40/43 ... gas storage chamber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Date Nobuo Iwatani Sangyo Co., Ltd. 3-4-8 Hommachi, Chuo-ku, Osaka-shi, Osaka

Claims (5)

[Scope of utility model registration request] 1. A processing chamber having a processing chamber (2) containing a processing tank (6) for storing liquid ammonia and a liquid ammonia volatilization chamber (3) continuous to the processing chamber (2). In a processing facility using ammonia configured to recover and liquefy the ammonia gas generated in (2), a processing chamber (2) and a volatilization chamber (3) and a gas storage chamber (40) (43) installed outside the processing facility And the gas outlet pipes (39) and (42) are connected to each other, and the processing chamber (2) and the volatilization chamber are connected to the respective gas outlet pipes (39) and (42).
An ammonia gas collecting device in a processing facility using ammonia, characterized in that a pressure opening / closing valve (38) (41) that opens when the internal pressure of (3) is out of the allowable pressure range is provided. 2. Gas storage chambers (40) (43) are connected to respective gas outlet pipes (39)
The ammonia gas collecting device in a processing facility using ammonia according to claim 1, which is individually arranged at the tip of (42). 3. A gas outlet pipe (39) led out from the processing chamber (2).
The ammonia gas collecting device in a processing facility using ammonia according to claim 1, wherein the gas outlet pipe (42) led out from the vaporizing chamber (3) is connected to a common gas storage chamber. 4. The ammonia gas trapping apparatus in a processing facility using ammonia according to claim 1, wherein the gas storage chambers (40) (43) are gas bags. 5. The ammonia gas collecting device in a processing facility using ammonia according to claim 2, wherein the gas storage chamber comprises a gas bag.