CN112755771A

CN112755771A - Falling film absorber

Info

Publication number: CN112755771A
Application number: CN202011583992.7A
Authority: CN
Inventors: 张拥军; 陈永健
Original assignee: TAICANG ZHENGXIN DRYING EQUIPMENT TECHNOLOGY CO LTD
Current assignee: TAICANG ZHENGXIN DRYING EQUIPMENT TECHNOLOGY CO LTD
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-05-07

Abstract

The invention discloses a falling film absorber which comprises a falling film shell, tubes and a cooling water tank, wherein a first containing cavity and a second containing cavity are arranged at the top and the bottom of the falling film shell, the tubes are arranged in the falling film shell, two ends of the tubes are respectively connected with the first containing cavity and the second containing cavity, a liquid inlet and an air outlet are arranged on the first containing cavity, a liquid outlet and an air inlet are arranged on the second containing cavity, the cooling water tank is arranged at the bottom of the falling film shell, the cooling water tank is internally provided with the cooling tubes, a cooling liquid inlet and a cooling liquid outlet of each cooling tube are arranged on the cooling water tank, an absorption liquid inlet and an absorption liquid outlet are respectively arranged at the top and the bottom of the cooling water tank, the liquid outlet is connected with the absorption liquid inlet, and the absorption. The cooling water tank is independently arranged, the absorption liquid is cooled in the cooling water tank, high-pressure cooling water cooling in the falling film shell is omitted, high-pressure leakage at the welding seam of the tube array is prevented, and the service life of the tube array is prolonged.

Description

Falling film absorber

Technical Field

The invention relates to a falling film absorber.

Background

The falling film absorber makes the absorption liquid flow down along the inner wall of the tube array, the gas flows up along the tube array and contacts with each other, and the absorption liquid is used for absorbing the gas. The chemical reaction generated in the process of absorbing the gas generates heat, and therefore, the temperature of the tube array needs to be reduced. In the existing structure, the tubes are arranged in a shell, and cooling water is filled into the shell to cool the tubes. During normal production activities, the cooling water is pressed into the housing under a normal pressure of 4kg, up to 6 kg. Thus, the weld between the tube array and the shell can leak after a period of use. And thus the contamination can spread.

Disclosure of Invention

Aiming at overcoming the defects in the prior art, the invention mainly aims to overcome the defects in the prior art and discloses a falling film absorber which comprises a falling film shell, a tube array and a cooling water tank, wherein a first containing cavity and a second containing cavity are arranged at the top and the bottom of the falling film shell, the tube array is arranged in the falling film shell, two ends of the tube array are respectively connected with the first containing cavity and the second containing cavity, a liquid inlet and an air outlet are arranged on the first containing cavity, a liquid outlet and an air inlet are arranged on the second containing cavity, the cooling water tank is arranged at the bottom of the falling film shell, a cooling tube is arranged in the cooling water tank, a cooling liquid inlet and a cooling liquid outlet of the cooling tube are arranged on the cooling water tank, an absorption liquid inlet and an absorption liquid outlet are respectively arranged at the top and the bottom of the cooling water tank, and the liquid outlet is connected with the absorption liquid inlet, the absorption liquid outlet is connected with the liquid inlet.

Further, the array pipes are PP pipes.

Further, the upper end of the column pipe is higher than the upper surface of the bottom of the first cavity.

Further, the bottom of the second cavity is of an arc-shaped structure.

Further, the liquid inlet is arranged on the side wall of the first cavity, and the air outlet is arranged at the top of the first cavity; the liquid outlet is arranged at the bottom of the second accommodating cavity, and the air inlet is arranged on the side wall of the second accommodating cavity.

Furthermore, a plurality of supporting sheets are axially arranged in the falling film shell at equal intervals, gaps are formed between the supporting sheets and the tubes, and the upper end and the lower end of the falling film shell are respectively provided with a water inlet and a water outlet.

Further, the cooling pipe is a coil pipe and is made of stainless steel, and PFA materials wrap the cooling pipe.

Further, the cooling pipes are arranged in three groups, and the coiling radius is reduced in sequence.

The invention has the following beneficial effects:

1. the cooling water tank is independently arranged, the absorption liquid is cooled in the cooling water tank, high-pressure cooling water cooling in the falling film shell is omitted, high-pressure leakage at the welding seam of the tube array is prevented, and the service life of the tube array is prolonged;

2. the tubes are supported and fixed by the supporting sheets, and gaps are arranged between the supporting sheets and the tubes, so that cooling water on the supporting sheets above flows to the supporting sheets below from the gaps and is left behind, and in the process, only small pressure is applied to the shell of the falling film, and the welding seams of the tubes cannot be damaged; meanwhile, the cooling of the absorption liquid in the tubes is realized;

3. deposit more absorption liquid in the cooling water tank, slowed down the intensification of absorption liquid to evenly divide through three groups cooling tube and establish in cooling water tank, promote the cold and hot exchange between cooling tube and the absorption liquid, improve cooling efficiency.

Drawings

Fig. 1 is a schematic diagram of the structure of a falling film absorber of the present invention;

FIG. 2 is a schematic structural view of a falling film shell and a tube array;

FIG. 3 is a schematic view of a cooling water tank;

the reference numbers are as follows:

1. falling film shell, 2, tube arrays, 3, cooling water tank, 11, first cavity, 12, second cavity, 13, support sheet, 31, cooling pipe, 32, absorption liquid inlet, 33, absorption liquid outlet, 111, liquid inlet, 112, air outlet, 121, liquid outlet, 122, air inlet, 311, cooling liquid inlet, 312 and cooling liquid outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A falling film absorber is shown in figures 1-3 and comprises a falling film shell 1, tubes 2 and a cooling water tank 3, wherein a first containing cavity 11 and a second containing cavity 12 are arranged at the top and the bottom of the falling film shell 1, the tubes 2 are arranged in the falling film shell 1, two ends of each tube are respectively connected with the first containing cavity 11 and the second containing cavity 12, a liquid inlet 111 and an air outlet 112 are arranged on the first containing cavity 11, a liquid outlet 121 and an air inlet 122 are arranged on the second containing cavity 12, the cooling water tank 3 is arranged at the bottom of the falling film shell 1, a cooling tube 31 is arranged in the cooling water tank 3, a cooling liquid inlet 311 and a cooling liquid outlet 312 of the cooling tube 31 are arranged on the cooling water tank 3, an absorption liquid inlet 32 and an absorption liquid outlet 33 are respectively arranged at the top and the bottom of the cooling water tank 3, the liquid outlet 121 is connected with the absorption liquid inlet, and the absorption liquid outlet. When in use, one falling film absorber can be used for absorption, or a multi-stage falling film absorber can be arranged for absorption, that is, one air outlet 112 is connected with the air inlet 122 of another falling film absorber. Gas enters from the second cavity 12 and is discharged from the first cavity 11, absorption liquid in the cooling water tank 3 is pumped into the first cavity 11, the absorption liquid flows into the second cavity along the tube array 2, and the gas and the absorption liquid are fully contacted in the tube array 2, so that the gas is absorbed. The liquid flowing into the second cavity 12 enters the cooling water tank 3, and the absorption liquid is cooled through the cooling pipe 31. In the process, no pressure exists in the falling film shell 1, the absorption liquid which falls freely is also arranged in the tube array 2, so that the service life of the tube array 2 is prolonged, and the welding seam leakage time between the tube array 2 and the first accommodating cavity 11 and the second accommodating cavity 12 is prolonged.

In one embodiment, as shown in FIGS. 1-3, the tubes 2 are PP tubes. So as to improve the acid and alkali corrosion resistance and prolong the service life.

In one embodiment, as shown in fig. 1-3, the upper end of the column 2 is higher than the upper surface of the bottom of the first receptacle 11. That is, the absorption liquid in the first cavity 11 needs to be kept at a certain liquid level and is higher than the upper end of the tube array 2, and the absorption liquid falls along the inner wall of the tube array 2.

In an embodiment, as shown in fig. 1 to 3, the bottom of the second cavity 12 has a circular arc structure. For collecting the absorption liquid to flow into the cooling water tank 3.

In one embodiment, as shown in fig. 1-3, the liquid inlet 111 is disposed on a side wall of the first cavity 11, and the air outlet 112 is disposed on a top of the first cavity 11; the liquid outlet 121 is disposed at the bottom of the second cavity 12, and the air inlet 122 is disposed at the side wall of the second cavity 12.

In one embodiment, as shown in fig. 1 to 3, a plurality of supporting sheets 13 are axially and equidistantly arranged in the falling film shell 1, through holes allowing the tubes 2 to pass through are formed in the supporting sheets 13, a gap is formed between the supporting sheets 13 and the tubes 2, and a water inlet and a water outlet are respectively formed at the upper end and the lower end of the falling film shell. The water inlet is filled with cooling water and flows out from the water outlet along the same trend, and the cooling liquid flows downwards along the supporting sheets 13 on the outer wall of the tube array 2 one by controlling the water inlet speed so as to be used for carrying out auxiliary cooling on the absorption liquid in the tube array 2.

In one embodiment, as shown in fig. 1-3, the cooling tube 31 is a coil and is made of stainless steel, and the cooling tube 31 is wrapped with PFA material.

In one embodiment, as shown in fig. 1-3, three sets of cooling tubes 31 are provided, with the winding radii decreasing in sequence. So that the absorption liquid is sufficiently contacted with the cooling pipe 31 to promote heat exchange.

In one embodiment, as shown in FIGS. 1-3, the coolant inlet 311 and the coolant outlet 312 are flanges. Such as DN 40. The flange is fixed on the cooling water tank 3 through a bracket, and the cooling pipe is connected with the flange through a movable sleeve joint.

The above are merely preferred embodiments of the present invention, and are not intended to limit the scope of the invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.

Claims

1. The falling film absorber is characterized by comprising a falling film shell, a row tube and a cooling water tank, wherein the top and the bottom of the falling film shell are provided with a first containing cavity and a second containing cavity, the row tube is arranged in the falling film shell, two ends of the row tube are respectively connected with the first containing cavity and the second containing cavity, the first containing cavity is provided with a liquid inlet and an air outlet, the second containing cavity is provided with a liquid outlet and an air inlet, the cooling water tank is arranged at the bottom of the falling film shell, the cooling water tank is internally provided with the cooling tube, a cooling liquid inlet of the cooling tube is arranged on the cooling water tank, a cooling liquid outlet of the cooling tube is arranged on the cooling water tank, the top and the bottom of the cooling water tank are respectively provided with an absorption liquid inlet and an absorption liquid outlet, the liquid outlet is connected with the liquid inlet, and the absorption liquid outlet is connected with.

2. The falling film absorber according to claim 1 wherein the tubes are PP tubes.

3. The falling film absorber according to claim 1 wherein the upper ends of said tubes are higher than the upper surface of the bottom of said first vessel.

4. The falling film absorber according to claim 1, wherein the bottom of the second cavity has a circular arc structure.

5. The falling film absorber according to claim 1, wherein the liquid inlet is disposed in a side wall of the first cavity and the air outlet is disposed in a top of the first cavity; the liquid outlet is arranged at the bottom of the second accommodating cavity, and the air inlet is arranged on the side wall of the second accommodating cavity.

6. The falling film absorber according to claim 1, wherein a plurality of support sheets are axially and equally spaced in the falling film shell, gaps are provided between the support sheets and the tubes, and the falling film shell is provided with a water inlet and a water outlet at the upper end and the lower end thereof.

7. The falling film absorber according to claim 1, wherein the cooling tube is a coil tube and is made of stainless steel, and the cooling tube is externally wrapped with PFA material.

8. The falling film absorber according to claim 7 wherein the cooling tubes are arranged in three groups and the coil radii are sequentially reduced.