CN217795449U - CO in flue gas 2 Trapping absorption tower - Google Patents

Abstract

The utility model discloses a CO in flue gas ₂ The capture absorption tower comprises a tower body, wherein a barren solution inlet, a rich solution outlet, a flue gas inlet and a flue gas outlet and a cleaning solution inlet and a cleaning solution outlet are arranged on the tower body, the cleaning solution flows from top to bottom along the filler, and the flue gas is in countercurrent contact with the liquid film from bottom to top to transfer substances; a distribution system is also included. The utility model discloses guarantee mass transfer efficiency, reduce and prevent putting of packed towerThe large effect, thus reducing the height and diameter of the tower, stabilizing the performance of the tower body and reducing the cost or operating cost.

Description

A CO2 capture absorption tower in flue gas

technical field

The utility model relates to the field of absorption towers, in particular to an absorption tower for collecting _CO2 in flue gas.

Background technique

The absorption tower is a device that uses chemical absorbents to remove CO ₂ in the flue gas to achieve the required purification indicators.

There are many problems in the absorption tower in the prior art. When the liquid flows downward along the packing layer, there is a tendency to gradually concentrate on the tower wall, so that the liquid flow near the tower wall gradually increases, resulting in wall flow phenomenon, and the wall flow effect causes The gas-liquid two-phase is unevenly distributed in the packing layer, which reduces the mass transfer efficiency. Moreover, the flow of liquid in the packing layer is not a uniform plug flow, but channel flow, bias flow, and wall flow, which will cause the amplification effect and end effect of the packed tower.

Generally, the commonly used random packing of absorbing towers has the characteristics of regular arrangement in the process of random random stacking. For example, CN 207446266 U discloses a random packing with multi-cutting surface rings. Although it has pressure drop, general It has the advantages of large volume, uniform liquid distribution, and large operating flexibility, but there are problems such as low efficiency, obvious amplification effect, and small processing capacity.

Utility model content

Aiming at the technical deficiencies mentioned above, the purpose of this utility model is to provide a _CO2 capture absorption tower in the flue gas, which solves the problem of liquid wall flow, ensures mass transfer efficiency, reduces and prevents the amplification effect of the packed tower, thereby reducing the tower The height and diameter of the tower, the performance of the tower body is stable, and the cost of construction or operation is reduced.

In order to achieve the above object, a CO in _flue gas of the present utility model captures and absorbs tower, comprises tower body, and described tower body is installed with barren liquid inlet, rich liquid outlet, flue gas inlet and outlet and washing liquid inlet and outlet, The washing liquid flows from top to bottom along the filler, and the flue gas contacts the liquid film countercurrently from bottom to top for material transfer; it also includes a distribution system;

One side of the upper part of the tower body is equipped with a washing liquid inlet, and the other side of the upper part of the tower body is equipped with a washing liquid outlet; the bottom side of the tower body is installed with a flue gas inlet, and the top of the tower body is equipped with a flue gas outlet A lean liquid inlet is installed on the upper part of the tower body, and a rich liquid outlet is installed below the flue gas inlet at the bottom of the tower body; a sewage outlet is installed at the lower end of the tower body;

The distribution system includes a high-throughput compound trough liquid distributor, an overflow compound trough liquid distributor, an overflow compound trough liquid redistributor and double tangential V blades installed sequentially from top to bottom of the tower Gas distributor, the high-throughput composite tank type liquid distributor is installed at the inlet of the washing liquid, the overflow composite tank type liquid distributor is installed in the middle of the tower body, and the double tangential V-blade gas A distributor is installed at the flue gas inlet.

Further, a wire mesh demister is installed on the top of the tower body, and the wire mesh demister is installed at the outlet of the flue gas.

Further, packing support plates are evenly distributed in the tower body, and structured packing is installed on the packing support plates.

Further, the tower body is provided with an inorganic heat preservation and anticorrosion layer.

Further, the inorganic thermal insulation and anticorrosion layer is an anticorrosion layer foam glass brick, and the internal pores are not connected to each other.

The beneficial effects of the utility model are:

1. Reasonable design and selection of the liquid initial distributor and redistributor can reduce and prevent the amplification effect of the packed tower, thereby reducing the tower height and diameter, and reducing the cost or operating cost;

2. The wire mesh demister can separate the liquid droplets entrained by the gas in the tower to ensure mass transfer efficiency, reduce the loss of valuable materials and improve the operation of the compressor behind the tower;

3. The whole packing can realize the minimum pressure drop of each theoretical stage, so it can reduce the temperature of the material at the bottom of the tower and save energy. It is especially suitable for the separation of multi-stage separation and heat-sensitive systems. High separation efficiency, small resistance, large flux, large operating flexibility, and no obvious amplification effect;

4. The anti-corrosion layer of the foam glass brick has excellent temperature resistance, corrosion resistance, no aging, no deterioration and excellent stability; the unique structure of the material makes it have a low thermal conductivity and thermal expansion coefficient and has good water resistance and anti-penetration ability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the utility model;

Explanation of reference signs:

1. Wire mesh demister; 2. High-throughput compound tank liquid distributor; 3. Structured packing; 4. Packing support plate; 5. Overflow compound tank liquid distributor; 6. Overflow compound tank liquid Redistributor; 7. Foam glass brick anti-corrosion layer; 8. Double tangential V blade gas distributor; N1, flue gas inlet; N2, lean liquid inlet; N3, rich liquid outlet; N4, washing liquid inlet; N5, washing Liquid outlet; N6, flue gas outlet; D1, sewage outlet.

Detailed ways

The utility model method of the present utility model is described and illustrated in detail below in conjunction with specific examples. Its content is an explanation of the utility model rather than limiting the protection scope of the utility model.

The utility model provides an absorption tower, which uses a chemical absorbent to remove _CO2 in flue gas to achieve the required purification index. Considering the reaction efficiency and mass transfer driving force, the gas-liquid countercurrent contact mass transfer equipment is adopted.

The tower belongs to differential contact countercurrent operation, and multi-layer structured packing 3 is arranged in the tower; the packing is the basic element of gas-liquid contact. The tower is equipped with a packing of a certain height, the liquid flows from top to bottom along the packing, and the gas contacts the liquid film countercurrently from the bottom to the top to carry out material transfer.

The tower body is a straight vertical cylinder, the bottom is equipped with a packing support plate 4, and a packing pressing plate is installed above the packing to prevent it from being blown by the updraft. The liquid is sprayed onto the filler from the top of the tower through the liquid distributor, and flows down along the surface of the filler. The gas is fed from the bottom of the tower, and after being distributed by the gas distribution device, it flows countercurrently with the liquid and continuously passes through the gap of the packing layer. On the surface of the packing, the gas-liquid two-phase is in close contact for mass transfer. The packed tower is a continuous contact gas-liquid mass transfer equipment. The composition of the two phases changes continuously along the height of the tower. Under normal operating conditions, the gas phase is the continuous phase and the liquid phase is the dispersed phase.

The principle of chemical solvent absorption is that the raw material gas and chemical solvent (mostly alkaline solution) undergo a chemical reaction in the absorption tower, CO ₂ enters the solvent to form a weakly linked intermediate compound, and then heat the intermediate compound to desorb CO ₂ , capture _CO2 by alternating absorption and desorption.

The new CO ₂ capture absorption tower is mainly composed of flue gas inlet N1, lean liquid inlet N2, rich liquid outlet N3, washing liquid inlet N4, washing liquid outlet N5, flue gas outlet N6, sewage outlet D1, wire mesh demister 1. High-throughput composite tank liquid distributor 2. Structured packing 3. Packing support plate 4. Overflow composite tank liquid distributor 5. Overflow composite tank liquid redistributor 6. Foam glass brick anti-corrosion layer 7. Double It is composed of tangential V-blade gas distributor 8 and other parts.

The wire mesh demister 1 is a gas-liquid separation device. The gas passes through the wire pad of the demister to remove the entrained mist. The wire mesh demister 1 can separate the liquid droplets entrained by the gas in the column to ensure mass transfer efficiency, reduce the loss of valuable materials and improve the operation of the compressor after the column.

The flow of liquid in the packing layer is not a uniform plug flow, but channel flow, bias flow, and wall flow. This will cause the amplification effect and end effect of the packed tower. When the packing layer is high, it needs to be segmented, and a redistribution device is installed in the middle. The purpose of rational design and selection of the liquid initial distributor and redistributor is to reduce and prevent the packing tower Magnification effect, thereby reducing tower height and tower diameter, reducing construction cost or operating cost.

Structured packing 3 is a packing that is arranged in a uniform geometric pattern and neatly stacked in the tower. Specifically, 125Y or 252Y structured packing can be used to minimize the pressure drop of each theoretical stage, so it can reduce the temperature of the material at the bottom of the tower and save energy. It is especially suitable It is used for the separation of multi-stage separation and heat-sensitive system. High separation efficiency, small resistance, large throughput, large operating flexibility, and no obvious amplification effect. At the same time, it can overcome the random flow of liquid in random packing and make the liquid tend to be uniform.

In addition to sufficient strength, the filler support plate 4 also requires a sufficiently large free area; small resistance to gas-liquid flow; conducive to gas-liquid redistribution; easy installation and disassembly.

The double tangential V-blade gas distributor 8 has more uniform gas velocity distribution, less pressure drop, less entrainment of liquid foam, less resistance, and excellent comprehensive performance.

Foam glass brick anti-corrosion layer 7 is a light-weight inorganic thermal insulation material with internal pores and incoherence, which is made of glass scrap or quartz sand as the main raw material, and other foaming materials are added and fired at high temperature in a kiln; due to the characteristics of the raw material glass With its unique production process, the material has excellent temperature resistance, corrosion resistance, no aging, no deterioration and excellent stability; the unique structure of the material makes it have a low thermal conductivity and thermal expansion coefficient and has a high Good water resistance and anti-penetration ability.

The deeply purified flue gas (temperature is 40°C) enters the absorption tower from the flue gas inlet N1, the flue gas flows from bottom to top, and forms countercurrent contact with the washing liquid (amine liquid) entering the tower from the upper washing liquid inlet N4, Make the scrubbing liquid fully absorb the CO ₂ of the flue gas. The purified flue gas is discharged from the flue gas outlet N6 at the top of the tower.

The washing liquid after absorbing _CO2 is the rich liquid, and the rich liquid will be discharged from the absorption tower from the rich liquid outlet N3 to the next step of reaction. Part of the washing liquid that has not fully absorbed _CO2 will be discharged from the absorption tower from the washing liquid outlet N5.

After the CO ₂ is decomposed, the lean liquid will release part of the CO ₂ but still have reabsorption capacity, so the lean liquid will enter the absorption tower again from the lean liquid inlet N2 for absorption reaction.

The reaction in the absorption tower may produce part of the sediment, which is discharged out of the tower from the sewage outlet D1 on a regular basis.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present utility model in detail. For the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (5)

1. A kind of CO in the _flue gas Capture and absorb tower, it is characterized in that, comprise tower body, described tower body top one side is equipped with washing liquid inlet (N4), the other side below described washing liquid inlet (N4) A washing liquid outlet (N5) is installed; a flue gas inlet (N1) is installed on the bottom side of the tower body, and a flue gas outlet (N6) is installed on the top of the tower body; a lean liquid is installed on the upper part of the tower body Inlet (N2), a rich liquid outlet (N3) is installed below the flue gas inlet at the bottom of the tower; a sewage outlet (D1) is also installed at the bottom of the tower; It also includes a distribution system, which includes a high-throughput compound tank type liquid distributor (2), an overflow compound tank type liquid distributor (5), and an overflow compound tank type liquid distributor (5) installed sequentially from top to bottom of the tower body. type liquid redistributor (6) and double tangential V-blade gas distributor (8), the high-throughput compound trough liquid distributor (2) is installed at the washing liquid inlet (N4), and the overflow A flow compound trough liquid distributor (5) is installed in the middle of the tower body, and the double tangential V-blade gas distributor (8) is installed at the flue gas inlet (N1). 2. CO in a kind of flue gas according to claim ₁ Capture absorption tower, it is characterized in that, the top in the tower body is also installed with wire mesh demister (1), and described wire mesh demister ( 1) Installed at the flue gas outlet (N6). 3. A _CO in flue gas capture absorption tower according to claim 2, characterized in that, a packing support plate is evenly distributed in the tower body, and a structured packing (3) is installed on the packing support plate . 4. A CO ₂ capture and absorption tower in flue gas according to claim 1, characterized in that, the tower body is provided with an inorganic heat preservation and anticorrosion layer. 5. A CO ₂ capture and absorption tower in flue gas according to claim 4, characterized in that, the inorganic thermal insulation and anticorrosion layer is an anticorrosion layer foam glass brick (7), and the internal pores are not connected to each other.

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