CN211411544U

CN211411544U - Absorption tower

Info

Publication number: CN211411544U
Application number: CN201922144553.5U
Authority: CN
Inventors: 林振丰; 赖世民
Original assignee: Duntex Co ltd
Current assignee: Duntex Co ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-09-04
Anticipated expiration: 2029-12-03

Abstract

An absorption tower is suitable for an ammonia absorption device, the absorption tower comprises a tower body, an absorption unit and a condensation unit, the absorption unit and the condensation unit are arranged on the tower body, the tower body is barrel-shaped and comprises a condensation area, an absorption area and an exhaust area with an exhaust port, the condensation area is provided with a condensation medium inlet, a condensation medium outlet and a liquid outlet, the absorption area is provided with an air inlet and a first return port communicated with the liquid outlet, the absorption unit is arranged in the absorption area and comprises a first absorption group and a first spraying group communicated with the first return port, the condensation unit is arranged in the condensation area and comprises a plurality of cooling coils which are connected in series and flatly arranged at the bottom of the condensation area and communicated with the condensation medium inlet and the condensation medium outlet, the contact area between absorption liquid at the bottom of the condensation area and the cooling coils is increased, and the heat exchange efficiency between the cooling coils and the absorption liquid is improved, effectively reducing the temperature of the absorption liquid and increasing the solubility of ammonia.

Description

Absorption tower

Technical Field

The present invention relates to an absorption tower, and more particularly to an absorption tower suitable for an ammonia absorption apparatus.

Background

Many industrial processes generate waste gas containing ammonia, such as chemical industry, semiconductor manufacturing process, etc., and there is an absorption tower for ammonia recovery (chinese patent application publication No. CN104474852A) comprising a waste gas inlet, a packing layer, a spraying device, and a tail gas outlet, wherein ammonia enters from the waste gas inlet, the ammonia is absorbed by the packing layer when passing through the packing layer, the spraying device sprays a spraying liquid on the ammonia and the packing layer, so that ammonia in the ammonia is dissolved in the spraying liquid and flows to the bottom of the absorption tower, the ammonia with reduced ammonia concentration is discharged from the tail gas outlet at the top of the absorption tower to the waste gas inlet of the next absorption tower, and the spraying liquid flowing to the bottom of the absorption tower is returned to the spraying device via a pump for spraying and recycling. However, this method can only rely on the matching of the packing layer and the spraying device to dissolve ammonia in the ammonia gas into the spraying liquid, and the ammonia dissolved in water will generate an exothermic reaction to raise the temperature of the ammonia liquid and reduce the solubility of ammonia, and the obtained ammonia liquid has a low concentration, resulting in poor ammonia gas absorption efficiency and recovery effect.

Disclosure of Invention

Therefore, the utility model aims at providing an absorption tower that is used for ammonia absorbing device, has cooling effect and absorption efficiency height promptly.

The utility model discloses an absorption tower contains tower body, absorption unit, and condensation unit. The tower body is the tubbiness and includes the diapire, is located the diapire top and connects the bottom wall's bottom wall, by the diapire with the condensation zone that the bottom wall was defined out, be located the bottom wall top and connect the center wall of bottom wall, by the absorption zone that the center wall was defined out, be located the center wall top and connect the top wall of center wall, and by the exhaust zone that the top wall was defined out, the bottom wall has condensing medium entry, condensing medium export, and leakage fluid dram, the center wall has the air inlet, and is located the air inlet top and with the first backflow mouth of leakage fluid dram intercommunication, the top of top wall has the gas vent. The absorption unit is arranged in the absorption area and comprises a first absorption group positioned between the air inlet and the first return opening and a first spraying group positioned between the first absorption group and the first return opening and communicated with the first return opening. The condensing unit is arranged in the condensing zone and comprises a plurality of cooling coils, and the cooling coils are flatly arranged at the bottom of the condensing zone and communicated with the condensing medium inlet and the condensing medium outlet.

The utility model discloses absorption tower, each cooling coil have be continuous heliciform and follow the perpendicular to the cross axle of axis is to the coil pipe portion that extends, be located coil pipe portion one end and intercommunication the entering portion of coil pipe portion, and be located the opposite end of entering portion and intercommunication the export department of coil pipe portion, the cooling coil establish ties set up in the condensation zone bottom.

The utility model discloses the absorption tower, the well leg still has and is located first return opening top and with the second return opening of leakage fluid dram intercommunication, the absorption unit is still including being located first spray the group with second between the second return opening absorbs the group, and is located the second absorb the group with between the second return opening and with the second of second return opening intercommunication sprays the group.

The utility model discloses absorption tower, well leg still has and is located the second absorb the group with the second sprays the inlet between the group.

The utility model discloses the absorption tower, first group of spraying has five sprinkler heads, the sprinkler head uses one of them sprinkler head as the center, and all the other sprinkler heads are equidistant to enclose and locate the periphery of center sprinkler head.

The utility model discloses the absorption tower, the second sprays the group and has five sprinkler heads, the sprinkler head uses one of them sprinkler head as the center, and all the other sprinkler heads are equidistant to enclose and locate the periphery of center sprinkler head.

The utility model discloses absorption tower, first absorption group have set firmly in the first rack of well leg internal face, the second absorption group have set firmly in the second rack of well leg internal face, first rack reaches be provided with a plurality of absorption fillers on the second rack respectively.

The utility model discloses absorption tower, the absorption is packed and is polyethylene material raschig ring.

The utility model discloses the absorption tower, the tower body still including set up in the end enclosure wall well enclosure wall with at least one manhole among the top enclosure wall, the manhole has the observation sight glass.

The utility model discloses the absorption tower, the tower body still including set up in the bottom leg outside just is used for surveing the level gauge of condensation zone liquid level.

The utility model discloses absorption tower beneficial effect lies in: through the cooling coil of condensing unit establishes ties and sets up in this condensation zone bottom of keeping flat, increases the absorption liquid of condensation zone bottom with cooling coil's area of contact improves the heat exchange efficiency of cooling coil and absorption liquid effectively reduces the temperature of absorption liquid and increases the solubility of ammonia, and then increases the absorption efficiency of ammonia.

Drawings

FIG. 1 is a cross-sectional view of one embodiment of an absorption column of the present invention;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;

FIG. 3 is a partial cross-sectional view taken along line III-III of FIG. 1; and

FIG. 4 is a flow chart of this embodiment, illustrating the operation principle of an ammonia gas absorbing apparatus.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals.

Referring to fig. 1 and 4, an embodiment of the absorption tower 1 of the present invention is suitable for an ammonia absorption device, which includes at least one absorption tower 1, at least one pump 5, a liquid storage tank 6, a circulation unit 7, and a blower 8, wherein the number of the pumps 5 corresponds to the number of the absorption towers 1, the number of the absorption towers 1 in this embodiment is two, and the absorption towers 1 are communicated with each other, and in other embodiments, the number of the absorption towers 1 may be more than two, for example, 8. The flow path of the absorbing liquid or the condensing medium in this embodiment is shown by a dotted line with arrows, and the flow path of the ammonia-containing gas mixture is shown by an imaginary line with arrows (a chain line with arrows in the figure).

Each absorption tower 1 comprises a tower body 2, an absorption unit 3, and a condensation unit 4.

The tower body 2 is barrel-shaped around an axis a and includes a bottom wall 21, a bottom surrounding wall 22 located above the bottom wall 21 and connected to the bottom wall 21, a level gauge 23 disposed outside the bottom surrounding wall 22, a condensation area 221 defined by the bottom wall 21 and the bottom surrounding wall 22, a middle surrounding wall 24 located above the bottom surrounding wall 22 and connected to the bottom surrounding wall 22, an absorption area 241 defined by the middle surrounding wall 24, a top surrounding wall 25 located above the middle surrounding wall 24 and connected to the middle surrounding wall 24, and an exhaust area 251 defined by the top surrounding wall 25, wherein the level gauge 23 is used for observing the amount of liquid of the absorption liquid in the condensation area 221.

The bottom surrounding wall 22 has a condensing medium inlet 222, a condensing medium outlet 223, and a liquid discharge port 224, the central wall 24 has an air inlet 242, a first return opening 243 located above the air inlet 242 and communicating with the liquid outlet 224, a second return opening 244 located above the first return opening 243 and communicating with the liquid outlet 224, and a liquid inlet 245 located between the first return opening 243 and the second return opening 244, as shown in fig. 4, the liquid inlet 245 is connected to the liquid outlet 224 of the next absorption tower 1 or the circulation unit 7, the circulation unit 7 supplies an absorption liquid for absorbing ammonia, the top end of the top surrounding wall 25 is provided with an exhaust port 252, the exhaust port 252 is connected to the intake port 242 of the next absorption tower 1 or the blower 8, the blower 8 is used for adjusting the pressure in the tower body 2 of the next absorption tower 1 to control the exhaust rate of the ammonia-containing mixed gas in the tower body 2.

Referring to fig. 1 and 2, the absorption unit 3 is disposed in the absorption region 241, and the absorption unit 3 includes a first absorption set 31 located between the air inlet 242 and the first return opening 243, a first spraying set 32 located between the first absorption set 31 and the first return opening 243 and communicated with the first return opening 243, a second absorption set 33 located between the first spraying set 32 and the liquid inlet 245, and a second spraying set 34 located between the liquid inlet 245 and the second return opening 244 and communicated with the second return opening 244. The first absorption set 31 has a first net rack 311 fixed on the inner wall of the central wall 24, the second absorption set 33 has a second net rack 331 fixed on the inner wall of the central wall 24, the first net rack 311 and the second net rack 331 are respectively provided with a plurality of absorption fillers 35, and the absorption fillers 35 are polyethylene raschig rings (not shown). The first spraying group 32 and the second spraying group 34 are respectively provided with five spraying heads 36, the spraying heads 36 take one spraying head 36 as a center, the other spraying heads 36 are arranged around the periphery of the center spraying head 36 at equal intervals, the arrangement mode of the spraying heads 36 enlarges the spraying range of the absorption liquid and uniformly sprays the absorption liquid to the absorption fillers 35, each absorption filler 35 is effectively and uniformly distributed with the absorption liquid, and the ammonia absorption efficiency of the first absorption group 31 and the second absorption group 33 is improved.

Referring to fig. 1 and 3, the condensing unit 4 includes a plurality of cooling coils 41 connected in series and flatly disposed at the bottom of the condensing area 221, wherein the tower body 2 further includes a transverse axis X orthogonal to the axis a, each cooling coil 41 has a coil portion 411 in a continuous spiral shape and extending along the transverse axis X, an inlet portion 412 located at one end of the coil portion 411 and communicating with the coil portion 411, and an outlet portion 413 located at an opposite end of the inlet portion 412 and communicating with the coil portion 411. The cooling coil 41 is communicated with the condensing medium inlet 222 and the condensing medium outlet 223, the condensing medium enters through the condensing medium inlet 222, flows through the cooling coil 41 and then flows out through the condensing medium outlet 223, and the condensing medium may be cooling water or other cooling gas, cooling liquid and other low-temperature flowing media. The configuration mode that the cooling coil 41 is horizontally arranged increases the contact area between the absorption liquid at the bottom of the condensation zone 221 and the cooling coil 41, improves the heat exchange efficiency between the cooling coil 41 and the absorption liquid, effectively reduces the temperature of the absorption liquid, increases the solubility of ammonia, and further increases the absorption efficiency of ammonia.

The tower body 2 further comprises three manholes 26 respectively disposed on the bottom surrounding wall 21, the middle surrounding wall 24 and the top surrounding wall 25, the manholes 26 disposed on the middle surrounding wall 24 are located between the first absorbing set 31 and the first spraying set 32, the manholes 26 are respectively provided with an observation sight glass 261, the observation sight glass 261 can be used by a user to observe the spraying state of the absorbing liquid and the state of the material in the tower body 2 at the outside of the tower body 2, for example, whether the gap of the absorbing filler 35 is blocked by impurities or whether the cooling coil 41 is aged or damaged, so as to increase the convenience of maintenance, and the position design of the manholes 26 can also be used by the user to conveniently enter and exit or adjust the state of the absorbing filler 35, for example, the absorbing filler 35 is thrown in by the manholes 26 to adjust the absorbing efficiency of the absorbing unit 3.

The utility model discloses absorption tower 1's theory of operation as follows:

referring to fig. 4, beginning from the absorption tower 1 connected to the liquid storage tank 6, the ammonia-containing gas mixture enters the absorption area 241 through the air inlet 242 of the absorption tower 1, part of the ammonia-containing gas mixture rises and is absorbed by the water mist-like absorption liquid sprayed by the first spraying group 32 and the second spraying group 34 and the absorption liquid attached to the absorption filler 35, the absorption liquid absorbing ammonia flows down to the bottom of the condensation area 221, the absorption liquid exchanges heat with the cooling coil 41 of the condensation unit 4, and the cooled part of the absorption liquid is discharged from the liquid outlet 224 and then is sent to the liquid storage tank 6 through the pump 5, the remaining part of the absorption liquid is discharged from the liquid discharge port 224 and returned to the first return port 243 and the second return port 244 via the pump 5, the absorbent fillers 35 are uniformly sprayed on the first net rack 311 and the second net rack 331 through the spraying heads 36 of the first spraying group 32 and the second spraying group 34. The ammonia-containing gas mixture not absorbed by the absorption liquid rises to the exhaust port 252 of the top enclosure wall 25, and proceeds to the intake port 242 of the next absorption tower 1 to perform a similar cycle operation as described above.

To sum up, the utility model discloses absorption tower 1, the cooling coil 41 through this condensing unit 4 is established ties and is kept flat and set up in this condensation zone 221 bottom, can effectual reduction absorption liquid the temperature and then promote the absorption efficiency of ammonia in the absorption liquid. The spraying range of the absorption liquid is expanded by the configuration mode of the spraying head 36, and the polyethylene raschig rings are used as the absorption fillers 35, so that each absorption filler 35 is effectively and uniformly distributed with the absorption liquid, and the ammonia absorption efficiency of the first absorption group 31 and the second absorption group 33 is improved. Therefore, the object of the present invention can be achieved.

Claims

1. An absorption tower suitable for an ammonia gas absorption plant, the absorption tower comprising: the device comprises a tower body, an absorption unit and a condensation unit; the method is characterized in that:

the tower body is barrel-shaped around an axis and comprises a bottom wall, a bottom surrounding wall, a condensation area, a middle surrounding wall, an absorption area, a top surrounding wall and an exhaust area, wherein the bottom surrounding wall is defined by the bottom wall and the bottom surrounding wall, the middle surrounding wall is located by the bottom surrounding wall and is connected with the bottom surrounding wall, the absorption area is defined by the middle surrounding wall, the top surrounding wall is located by the middle surrounding wall and is connected with the middle surrounding wall, the exhaust area is defined by the top surrounding wall, the bottom surrounding wall is provided with a condensing medium inlet, a condensing medium outlet and a liquid outlet, the middle surrounding wall is provided with an air inlet and a first backflow port which is located by the air inlet and is communicated with the liquid outlet, the top end of the top surrounding wall is provided with an air outlet, the absorption unit is arranged in the absorption area and comprises a first absorption group located between the air inlet and the first backflow port and a first spraying group located between the first absorption group and the first backflow port and is communicated with, the condensing unit is arranged in the condensing zone and comprises a plurality of cooling coils, and the cooling coils are flatly arranged at the bottom of the condensing zone and communicated with the condensing medium inlet and the condensing medium outlet.

2. The absorber column according to claim 1, wherein: each cooling coil has and is continuous heliciform and along the cross axial extension's of perpendicular to the axis coil portion, be located coil portion one end and intercommunication the entrance part of coil portion, and be located the opposite end of entrance part and communicate the export portion of coil portion, cooling coil series connection set up in the condensation zone bottom.

3. The absorber column according to claim 2, wherein: the middle surrounding wall is also provided with a second backflow port which is positioned above the first backflow port and communicated with the liquid discharge port, and the absorption unit also comprises a second absorption group which is positioned between the first spraying group and the second backflow port and a second spraying group which is positioned between the second absorption group and the second backflow port and communicated with the second backflow port.

4. The absorber column according to claim 3, wherein: the middle enclosing wall is also provided with a liquid inlet which is positioned between the second absorption group and the second spraying group.

5. The absorber column according to claim 4, wherein: the first spraying group is provided with five spraying heads, one spraying head is used as the center of the spraying heads, and the rest spraying heads surround the periphery of the center spraying head at equal intervals.

6. The absorber column according to claim 5, wherein: the second spraying group is provided with five spraying heads, one spraying head is used as the center of the spraying heads, and the other spraying heads are arranged around the periphery of the center spraying head at equal intervals.

7. The absorber column according to claim 6, wherein: the first absorption set is provided with a first net rack fixedly arranged on the inner wall surface of the middle surrounding wall, the second absorption set is provided with a second net rack fixedly arranged on the inner wall surface of the middle surrounding wall, and the first net rack and the second net rack are respectively provided with a plurality of absorption fillers.

8. The absorber column according to claim 7, wherein: the absorption filler is a Raschig ring made of polyethylene.

9. The absorber column according to claim 1, wherein: the tower body further comprises a manhole arranged in at least one of the bottom surrounding wall, the middle surrounding wall and the top surrounding wall, and the manhole is provided with an observation sight glass.

10. The absorber column according to claim 1, wherein: the tower body is still including set up in the bottom wall outside just is used for observing the level gauge of condensation zone liquid level.