CN212215061U

CN212215061U - Combined type carbon dioxide desorber

Info

Publication number: CN212215061U
Application number: CN202021181975.6U
Authority: CN
Inventors: 薛群翔; 曹彬; 王荣; 张海燕
Original assignee: Xi'an Benqing Chemical Technology Co ltd
Current assignee: Xi'an Benqing Chemical Technology Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2020-12-25
Anticipated expiration: 2030-06-23

Abstract

The utility model provides a combined carbon dioxide desorption tower; comprises a purified gas outlet (1), a demister (2), a first liquid inlet distributor (3), a tray (4), a packing layer (5), an interlayer liquid distributor (6), a second liquid inlet distributor (7), a tray plate (8), a gas-liquid mixing inlet pipe (9), a liquid outlet pipe (10), a first liquid inlet pipe (12), a second liquid inlet pipe (13) and a tower body. The utility model adopts the internal structure mode that the filler and the tower plate are respectively arranged, when the carbon dioxide required to be produced under the actual operation working condition is less, the flow of the required rich amine liquid is less, only the tower plate part of the tower body can be used for stripping desorption, and the filler part is used as a demister, thereby greatly reducing the liquid carrying amount of the carbon dioxide gas which is discharged from the tower top; the problem of small bias flow and operation elasticity of the packed tower can be solved, and the adaptability to alcohol amine solutions with different performances can be enhanced.

Description

Combined type carbon dioxide desorber

Technical Field

The utility model relates to a desorption tower; in particular to a composite carbon dioxide desorption tower.

Background

The plate tower and the packed tower are widely used in the processes of distillation, absorption and extraction, adsorption, washing, cooling and other chemical unit processes. The packed tower has the advantages of high separation efficiency, small pressure drop, high treatment capacity and the like, but when liquid flows on the surface of the packing, the liquid is easy to accumulate on the wall of the tower to flow down in a strand manner, and a liquid distributor is required to be arranged; the plate tower has the advantages of large operation elasticity, difficult blockage, low cost and the like, but has larger pressure drop and large power consumption when being used for unit operation of high towers and large gas flow.

At present, the most mature technology for capturing low-concentration carbon dioxide in industrialization is an alcohol amine solution chemical absorption method, which adopts a plate tower as desorption equipment and steam as desorption air flow to heat alcohol amine solution rich liquid so as to achieve the effect of desorbing carbon dioxide. The chemical absorption method of alcohol amine solution is characterized by that the rich amine liquid absorbing carbon dioxide is fed into the carbon dioxide desorption tower from its upper portion, and fully contacted with the mixed gas of steam and carbon dioxide fed from reboiler at the bottom of tower on the tower plate to make heat transfer and mass transfer, and finally the carbon dioxide is escaped from gas outlet at the top of tower, and the desorbed poor amine liquid is flowed out from liquid outlet at the bottom of tower. The method has the advantages of simple process, stable carbon dioxide removal efficiency and the like, but also has the problems of large equipment resistance, low carbon dioxide desorption efficiency and higher tower body.

Common carbon dioxide desorption equipment only sprays amine-rich liquid at the top of the tower, but the amine liquid with good absorption effect has higher desorption difficulty due to different amine liquid properties, and the number of required plate-type desorption towers is more, so that the height of the tower body is higher; for a packed tower, when the amount of the required rich amine desorption liquid is small, bias flow is easy to occur in a packing layer, so that the desorption efficiency is reduced, and the problem of small desorption operation elasticity exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a combined type carbon dioxide desorber.

The utility model discloses a realize through following technical scheme: the utility model relates to a combined type carbon dioxide desorption tower, which consists of a purified gas outlet 1, a demister 2, a first liquid inlet distributor 3, a tower tray 4, a packing layer 5, an interlayer liquid distributor 6, a second liquid inlet distributor 7, a tower plate 8, a gas-liquid mixing inlet pipe 9, a liquid outlet pipe 10, a first liquid inlet pipe 12, a second liquid inlet pipe 13 and a tower body;

the utility model discloses a tower body, the tower body is equipped with the tower body, the purification gas outlet 1 below on tower body top is provided with demister 2, be provided with first liquid inlet distributor 3 in demister 2's below, the below of first liquid inlet distributor 3 is provided with multilayer packing layer 5, set up liquid distributor 6 and tray 4 between the adjacent packing layer 5, bottom packing layer 5 below is equipped with second liquid inlet distributor 7, second liquid inlet distributor 7 below sets up multilayer column plate 8, bottom column plate 8 below is equipped with gas-liquid mixture import pipe 9, the tower cauldron bottom is equipped with liquid outlet pipe 10, liquid gets into reboiler heating desorption through liquid outlet pipe 10, the gas-liquid mixture fluid after the desorption gets into the tower body through gas-liquid mixture import pipe 9, the liquid after the desorption carbon dioxide goes out the reboiler.

Preferably, the packing layer 5 is a random packing layer or a structured packing layer.

Preferably, the packing layer 5 is provided with an interlayer liquid distributor 6 at a height of 1.0 m to 1.5 m.

Preferably, the distance between the interlayer liquid distributor 6 and the upper and lower filler layers is 200-500 mm.

The combined carbon dioxide desorption tower uses different liquid inlets according to the liquid flow, and the flow of the first liquid distributor and the flow of the second liquid distributor can be adjusted according to the actual conditions (the liquid flow, the desorption depth and the like).

The method of the utility model has the following advantages:

(1) the utility model adopts the internal structure mode that the filler and the tower plate are respectively arranged, when the carbon dioxide required to be produced under the actual operation working condition is less or the capture rate of the carbon dioxide is lower, the flow of the required rich amine liquid is less at the moment, only the tower plate part of the tower body can be used for stripping and desorbing, and the filler part is used as a demister, thereby greatly reducing the liquid carrying amount of the carbon dioxide gas which is discharged from the tower from the top of the tower, and simultaneously achieving the effect of reducing the energy consumption of a single ton of carbon dioxide product; when the actual operation condition needs more carbon dioxide or requires that the desorption depth of the amine liquid is deeper or the capture rate of the carbon dioxide is higher, the flow of the rich amine liquid is larger, the stripping desorption can be carried out by using the filler part and the tower plate part of the tower body, and the desorption efficiency of the filler part is far higher than that of the tower plate part, so that the height of the tower body can be greatly reduced, the construction cost is reduced, the resistance is reduced, the power consumption is saved, the problems of bias flow and smaller operation elasticity of the filler tower can be solved, and meanwhile, the adaptability to alcohol amine solutions with different performances can be enhanced.

(2) The utility model has the characteristics of the elasticity of operation is big, desorption is efficient, the resistance is little, with low costs, highly suitable and the energy consumption is little.

Drawings

Fig. 1 is a structural diagram of a combined carbon dioxide desorption tower according to the present invention.

Wherein the content of the first and second substances,

1 is the export of purified gas, 2 is the demister, 3 is first liquid distributor, 4 is the tray, 5 is the packing layer, 6 is interlayer liquid distributor, 7 is the second liquid distributor, 8 is the column plate, 9 is gas-liquid mixture import pipe, 10 is the liquid outlet pipe, 11 is the valve, 12 is the first import pipe of liquid, 13 is the second import pipe of liquid.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. It should be noted that the following examples are only illustrative of the present invention, but the scope of the present invention is not limited to the following examples.

Example 1

The embodiment relates to a combined type carbon dioxide desorption tower, the structure of which is shown in figure 1: the device consists of a purified gas outlet 1, a demister 2, a first liquid inlet distributor 3, a tower tray 4, a filler layer 5, an interlayer liquid distributor 6, a second liquid inlet distributor 7, a tower plate 8, a gas-liquid mixing inlet pipe 9, a liquid outlet pipe 10, a first liquid inlet pipe 12, a second liquid inlet pipe 13 and a tower body; wherein the first inlet pipe 12 for liquid and the second inlet pipe 13 for liquid are provided with valves 11.

In this embodiment: the desorption amount of the carbon dioxide is less than 60 percent of the designed desorption amount, the actual flow of the rich amine liquid is small, the first liquid inlet distributor 3 is closed, the second liquid inlet distributor 7 is opened, the rich amine liquid enters the tower body from the second liquid inlet distributor 7, the rich amine liquid is subjected to heat and mass transfer with the mixed gas of steam and carbon dioxide gas from the reboiler through the tower plate section, the heating of the rich amine liquid and the partial desorption of the carbon dioxide are realized, the rich amine liquid desorbing partial carbon dioxide enters the reboiler of the tower kettle for further temperature rise and desorption, and the desorbed lean amine liquid is discharged out of the desorption tower through the second liquid outlet; the desorbed carbon dioxide gas passes through the packing layer 5 and the demister 2, and water droplets and amine droplets carried in the carbon dioxide gas are removed and then discharged from the gas outlet.

Example 2

The utility model discloses a tower body, the tower body is equipped with the tower body, the purification gas outlet 1 below on tower body top is provided with demister 2, be provided with first liquid inlet distributor 3 in demister 2's below, the below of first liquid inlet distributor 3 is provided with multilayer packing layer 5, set up liquid distributor 6 and tray 4 between the adjacent packing layer 5, bottom packing layer 5 below is equipped with second liquid inlet distributor 7, second liquid inlet distributor 7 below sets up multilayer column plate 8, bottom column plate 8 below is equipped with gas-liquid mixture import pipe 9, the tower cauldron bottom is equipped with liquid outlet 10, liquid gets into reboiler heating desorption through liquid outlet 10, the gas-liquid mixture fluid after the desorption gets into the tower body through gas-liquid mixture import pipe 9, the liquid after the desorption carbon dioxide goes out the reboiler.

Preferably, the packing layer is a random packing layer or a structured packing layer.

In this embodiment: the desorption amount of the carbon dioxide is more than 60 percent of the designed desorption amount, the actual flow of the rich amine liquid is larger, the second liquid inlet distributor 7 is closed, the first liquid inlet distributor 3 is opened, the rich amine liquid enters the tower body from the first liquid inlet distributor 3, passes through the filler section 5 and the interlayer liquid distributor 6, and transfers heat and mass with the mixed gas of the steam and the carbon dioxide gas from the tower plate section, so that the heating of the rich amine liquid and the partial desorption of the carbon dioxide are realized, the heat and mass transfer with the mixed gas of the steam and the carbon dioxide gas from the reboiler is realized through the tower plate section, the heating of the rich amine liquid and the partial desorption of the carbon dioxide are realized, the rich amine liquid desorbing partial carbon dioxide enters the reboiler of the tower kettle for further temperature rise and desorption, and the desorbed lean amine liquid is discharged out of the desorption tower through the second liquid outlet; the desorbed carbon dioxide gas passes through the packing layer 5 and the demister 2, and water droplets and amine droplets carried in the carbon dioxide gas are removed and then discharged from the gas outlet.

The method of the utility model has the following advantages:

(1) the utility model adopts the internal structure mode that the filler and the tower plate are respectively arranged, when the carbon dioxide required to be produced under the actual operation working condition is less, the flow of the required rich amine liquid is less, only the tower plate part of the tower body can be used for stripping desorption, and the filler part is used as a demister, thereby greatly reducing the liquid carrying amount of the carbon dioxide gas which is discharged from the tower from the top of the tower, and simultaneously achieving the effect of reducing the energy consumption of a single ton of carbon dioxide product; when the actual operation condition needs more carbon dioxide or requires the amine liquid to be desorbed with deeper depth, the flow of the rich amine liquid is larger, the packing part and the tower plate part of the tower body can be used for stripping desorption, and the desorption efficiency of the packing part is far higher than that of the tower plate part, so that the height of the tower body can be greatly reduced, the construction cost is reduced, the resistance is reduced, the power consumption is saved, the problems of bias flow and smaller operation elasticity of the packing tower can be solved, and meanwhile, the adaptability to alcohol amine solutions with different performances can be enhanced.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention.

Claims

1. A combined carbon dioxide desorption tower is characterized by comprising a purified gas outlet (1), a demister (2), a first liquid inlet distributor (3), a tower tray (4), a packing layer (5), an interlayer liquid distributor (6), a second liquid inlet distributor (7), a tower plate (8), a gas-liquid mixed inlet pipe (9), a liquid outlet pipe (10), a first liquid inlet pipe (12), a second liquid inlet pipe (13) and a tower body;

wherein a demister (2) is arranged below a purified gas outlet (1) at the top end of the tower body, a first liquid inlet distributor (3) is arranged below the demister (2), a plurality of packing layers (5) are arranged below the first liquid inlet distributor (3), an interlayer liquid distributor (6) and a tray (4) are arranged between the adjacent packing layers (5), a second liquid inlet distributor (7) is arranged below the packing layer (5) at the bottom layer, the multi-layer tower plates (8) are arranged below the second liquid inlet distributor (7), the gas-liquid mixing inlet pipe (9) is arranged below the bottom tower plate (8), the liquid outlet pipe (10) is arranged at the bottom of the tower kettle, liquid enters the reboiler through the liquid outlet pipe (10) for heating and desorption, the gas-liquid mixing fluid after desorption enters the tower body through the gas-liquid mixing inlet pipe (9), and the liquid after carbon dioxide desorption exits the reboiler.

2. The composite carbon dioxide desorption tower of claim 1, wherein the packing layer (5) is a random packing layer or a structured packing layer.

3. The composite carbon dioxide desorber as claimed in claim 1, wherein the packing layer (5) is provided with an interlaminar liquid distributor (6) at a height of 1.0 m to 1.5 m.

4. The composite carbon dioxide desorption tower of claim 1, wherein the distance between the interlayer liquid distributor (6) and the upper and lower packing layers is 200-500 mm.