Carbon dioxide absorption device

Abstract

The invention provides a carbon dioxide absorption device which comprises a shell, the inner space of the shell is divided into a plurality of spaces by partition plates, and the spaces comprise a gas-liquid separation cavity and a liquid recovery cavity; a protruding strip-shaped gas-liquid separation part is arranged on the inner wall of the gas-liquid separation cavity; a separation liquid through hole is formed in the partition plate in a penetrating manner; an exhaust port is formed in the wall of the gas-liquid separation cavity; when the carbon dioxide absorption device is in an assembled state, the gas-liquid separation cavity is arranged above the liquid recovery cavity in the gravity direction; the central line of the spiral air pipe is a cylindrical spiral line; an air inlet of the spiral air pipe is formed in the outer part of the shell; a gas outlet of the spiral gas pipe is formed in the gas-liquid separation cavity; a liquid spraying opening is formed in the spiral air pipe. The method can be widely applied to the field of tail gas purification of marine diesel engine systems.

Description

Technical Field

[0001] The invention relates to a device for absorbing carbon dioxide in engine tail gas, in particular to a device for absorbing carbon dioxide in ship diesel engine tail gas. Background Art

[0002] Carbon dioxide, as the main greenhouse gas, is considered to be the key cause of the intensification of the greenhouse effect. Therefore, technologies to reduce carbon dioxide emissions are increasingly valued and developed.

[0003] The exhaust gas emitted by marine diesel engines during operation is one of the main sources of carbon dioxide. The main technologies for carbon dioxide absorption in marine engines include chemical absorption. Chemical absorption refers to the use of chemical solvents (also known as carbon dioxide absorption liquids) to absorb carbon dioxide through chemical reactions with carbon dioxide. Alkaline chemical absorption liquids are usually used, such as alcohol amines, potash and ammonia water. Currently, the more mature chemical absorption processes are mostly based on ethanolamine aqueous solutions, such as the monoethanolamine method (MEA method), the diethanolamine method (DEA method) and the methyldiethanolamine method (MDEA method).

[0004] The main part of the existing carbon dioxide absorption device for ship diesel engine exhaust is the absorption tower. Multiple layers of trays can be set in the absorption tower, and there are many small holes on the trays for the circulation of gas and liquid. The function of the trays is to make the gas and liquid phases fully contact and improve the absorption efficiency. Common tray types include bubble trays, sieve trays, float valve trays, etc. Fillers can also be used to increase the gas-liquid contact area. However, the existing absorption tower has a large structure and will occupy precious space resources on the ship; on the other hand, the multiple layers of trays form a large resistance to the emission of exhaust gas. Summary of the invention

[0005] In order to solve the problems of large volume and large exhaust resistance of the aforementioned existing carbon dioxide absorption device of marine diesel engines, the present invention provides a carbon dioxide absorption device.

[0006] The technical solution of the present invention is as follows:

[0007] A carbon dioxide absorption device comprises a shell, wherein the internal space of the shell is divided into a plurality of spaces by a partition, wherein the spaces comprise: a gas-liquid separation chamber and a liquid recovery chamber; a protruding strip-shaped gas-liquid separation member is arranged on the inner wall of the gas-liquid separation chamber; a separation liquid through hole is arranged through the partition; an exhaust port is arranged on the wall of the gas-liquid separation chamber; when the carbon dioxide absorption device is in an assembled state, the gas-liquid separation chamber is arranged above the liquid recovery chamber in the direction of gravity; the device also comprises a spiral air pipe, wherein the center line of the spiral air pipe is a cylindrical spiral line; an air inlet of the spiral air pipe is arranged outside the shell; an air outlet of the spiral air pipe is arranged in the gas-liquid separation chamber; and a liquid spray port is arranged in the spiral air pipe.

[0008] Optionally, the gas-liquid separator includes a substrate and a buckle strip buckled on the substrate; the cross section perpendicular to the long axis of the buckle strip is U-shaped; and an air hole is arranged through the bottom of the buckle strip.

[0009] Optionally, the shape of the pore includes two adjacent circles and a dumbbell shape formed by a detail connecting the two circles.

[0010] Optionally, the exhaust port is arranged on the first wall of the gas-liquid separation chamber; the second wall of the gas-liquid separation chamber is opposite to the first wall; and the air outlet of the spiral air pipe is arranged toward the second wall.

[0011] Optionally, a grid formed by a plurality of spaced apart gas-liquid separation elements is provided in the gas-liquid separation chamber; the grid is provided between the exhaust port and the gas outlet of the spiral air pipe.

[0012] Optionally, a guide plate is provided at the air outlet of the spiral air duct; the guide direction of the guide plate is toward a direction away from the second wall.

[0013] Optionally, a liquid outlet is provided on the wall of the spiral air tube.

[0014] Optionally, in the direction of gravity, a lower edge of the air inlet of the spiral air duct in the direction of gravity is higher than the lowest point of the inner wall of the spiral air duct in the direction of gravity.

[0015] Optionally, a liquid outlet is provided at the lowest point of the inner wall of the spiral air tube in the direction of gravity.

[0016] Optionally, the liquid spray port is arranged toward the direction of the air flow source.

[0017] The technical effects of the present invention are as follows:

[0018] In the carbon dioxide absorption device of the present invention, the tail gas is mixed and reacted with the carbon dioxide absorption liquid sprayed from the liquid spray port while flowing in the spiral air pipe, so that the carbon dioxide is absorbed. The spiral air pipe prolongs the path of the tail gas flow in a limited space, and correspondingly prolongs the reaction time of the tail gas and the absorption liquid, so that the reaction of absorbing carbon dioxide is more fully carried out. The gas in the spiral air pipe enters the gas-liquid separation chamber through the gas outlet, collides with the gas-liquid separation element in the gas-liquid separation chamber, thereby achieving gas-liquid separation, and the separated liquid falls into the liquid recovery chamber under the action of gravity for recovery, and the separated gas (purified gas) is discharged through the exhaust port of the gas-liquid separation chamber. The carbon dioxide absorption device of the present invention, because it realizes the gas-liquid mixing reaction in the spiral air pipe, compared with the prior art, on the one hand, reduces the gas flow resistance, and on the other hand, the spiral air pipe meets the time required for the absorption reaction in a limited space, reduces the volume of the device, and achieves the purpose of the present invention.

[0019] The further effects of the above optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a three-dimensional diagram of the structural principle of an embodiment of the present invention.

[0021] Figure 2 for Figure 1 Top view of the illustrated embodiment.

[0022] Figure 3 for Figure 1 A front view of the gas-liquid separation element in the illustrated embodiment.

[0023] Figure 4 for Figure 3 A top view of the gas-liquid separation element is shown.

[0024] The symbols in the figure are explained as follows:

[0025] 101, grille; 102, second wall; 103, guide plate; 104, air outlet; 105, separation liquid through hole; 106, air inlet; 107, lowest point of spiral air pipe; 108, liquid recovery chamber; 109, spiral air pipe; 110, partition; 111, air outlet; 112, first wall; 113, gas-liquid separation element;

[0026] 201. buckle strip; 202. base plate; 203. air hole. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below in conjunction with the embodiments shown in the accompanying drawings.

[0028] like Figure 1As shown, the carbon dioxide absorption device of the present invention includes an internal space of the shell formed by the shell. In order to show the structure of the internal space of the shell, the Figure 1 The carbon dioxide absorption device shown in the part of the shell wall (located at Figure 1 The front wall of the housing and the Figure 1 The housing top cover is the top cover of the carbon dioxide absorption device in the middle. The internal space of the housing is divided into two upper and lower chambers by the partition 110 in the gravity direction: a gas-liquid separation chamber located at the top and a liquid recovery chamber 108 located at the bottom. The partition 110 is provided with a separation liquid through hole 105 connecting the gas-liquid separation chamber and the liquid recovery chamber 108.

[0029] A strip-shaped gas-liquid separator 113 is arranged on the inner wall of the gas-liquid separation chamber. A grid 101 composed of a plurality of gas-liquid separators 113 arranged in parallel and at intervals in the length direction is also arranged inside the gas-liquid separation chamber. The grid 101 further divides the space of the gas-liquid separation chamber into two spaces: the space between the first wall 112 and the grid 101, and the space between the second wall 102 and the grid 101. The first wall 112 and the second wall 102 are two opposite and parallel planar walls inside the gas-liquid separation chamber. An exhaust port 111 is arranged on the first wall 112.

[0030] Figure 1 The carbon dioxide absorption device shown also includes a spiral air pipe 109. The spiral air pipe 109 is a spirally wound pipe. The center line of the spiral air pipe 109 is a cylindrical spiral line, that is, it is in the shape of a spiral spring. The air inlet 106 of the spiral air pipe 109 is arranged on the outside of the shell. The air outlet 104 of the spiral air pipe 109 is arranged in the gas-liquid separation chamber. The air outlet 104 is arranged toward the second wall 102. The front section of the spiral air pipe 109 in the air flow direction is arranged in the liquid recovery chamber 108, and the rear section of the spiral air pipe 109 in the air flow direction is arranged in the gas-liquid separation chamber. A liquid spray port (not shown in the figure) is arranged in the spiral air pipe 109. The liquid spray port is used to spray carbon dioxide absorption liquid into the spiral air pipe 109. The liquid spray port is arranged toward the direction of the air flow source. As shown Figure 1 As shown, in the gravity direction, the lower edge of the spiral air tube 109 in the gravity direction is higher than the lowest point of the inner wall of the spiral air tube 109 in the gravity direction (i.e., the lowest point 107 of the spiral air tube). The lowest point 107 of the spiral air tube is arranged in the liquid recovery chamber 108. A liquid outlet (not shown in the figure) is arranged at the lowest point 107 of the spiral air tube.

[0031] like Figure 1 and Figure 2 As shown, a guide plate 103 is provided at the gas outlet 104 . The guide plate 103 is used to guide the gas discharged from the gas outlet 104 to a direction away from the second wall 102 .

[0032] like Figure 3 and Figure 4 As shown, the gas-liquid separator 113 includes a substrate 202 and a buckle strip 201. The substrate 202 is in the shape of a long rectangular strip. The length of the buckle strip 201 is equal to the length of the substrate 202. The cross section of the buckle strip 201 perpendicular to its length direction is U-shaped. Along the length direction of the two, the buckle strip 201 is buckled on the substrate 202, that is, the two raised edges of the cross section of the buckle strip 201 are connected to the plate surface of the substrate 202, thereby forming a space enclosed by the buckle strip 201 and the substrate 202. At the bottom of the buckle strip 201 (at the bottom of the U shape), an air hole 203 that penetrates the buckle strip 201 is provided. The shape of the air hole 203 is approximately a dumbbell shape formed by two adjacent circles and the details connecting the two circles. The length direction of the dumbbell shape is parallel to the length direction of the substrate 202.

[0033] The working process of the embodiment shown in the accompanying drawings is described below to further illustrate the technical solution of the present invention.

[0034] The exhaust gas of the ship's diesel engine enters the spiral air pipe 109 through the air inlet 106, and the carbon dioxide absorption liquid sprayed from the liquid spray port mixes with the exhaust gas to produce a carbon dioxide absorption reaction. The mixed gas flows in a spiral upward from bottom to top in the spiral air pipe 109. Since the spiral air pipe 109 extends the path of the exhaust gas flow in a limited space, the time for the exhaust gas to flow in the spiral air pipe 109 is also extended, so that the aforementioned carbon dioxide absorption reaction can be carried out more fully. The liquid produced by the carbon dioxide absorption reaction flows downward in the spiral air pipe 109 under the action of gravity, and flows into the liquid recovery chamber 108 from the liquid outlet. Since the liquid outlet is lower than the lower edge of the air inlet 106 in the direction of gravity, it can prevent the liquid from further flowing along the exhaust gas pipeline in the opposite direction of the exhaust gas flow, thereby avoiding damage to other parts of the diesel engine.

[0035] The gas discharged from the gas outlet 104 of the spiral gas pipe 109 will still contain liquid droplets. If the liquid droplets are discharged with the gas, they will pollute the subsequent environment. When the gas is discharged from the spiral gas pipe 109 from the gas outlet 104, it flows in a direction away from the second wall 102 under the guidance of the guide plate 103. During the flow, the gas collides with the gas-liquid separation element 113 on the inner wall of the gas-liquid separation chamber. After colliding with the inner wall of the gas-liquid separation chamber, the gas will further flow to the grid 101. Figure 2 As shown, the bottom of the buckle bar 201 of the gas-liquid separator 113 in the grid 101 is arranged toward the gas source. Figure 3As shown, after the gas collides with the gas-liquid separator 113 from multiple angles, a part of the gas collides with the substrate 202 and the buckle strip 201 to produce a gas-liquid separation effect, and the other part enters the space between the buckle strip 201 and the substrate 202 through the air hole 203, where it collides with the inner wall of the space more times and then is discharged through the air hole 203. The shape of the air hole 203 creates a disturbance to the airflow, making the above-mentioned collision more intense, thereby enhancing the effect of gas-liquid separation. The gas passing through the grille 101 is discharged through the exhaust port 111. The liquid separated in the gas-liquid separation chamber passes through the separation liquid through hole 105 and flows into the liquid recovery chamber 108 under the action of gravity.

[0036] It is worth noting that the above is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. The present invention can also improve the materials and structures of the above-mentioned various parts, or replace them with technical equivalents. Therefore, all equivalent structural changes made by using the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims

1. A carbon dioxide absorption device, comprising a housing, characterized in that: The internal space of the shell is divided into a plurality of spaces by partitions, and the spaces include: a gas-liquid separation chamber and a liquid recovery chamber; a protruding strip-shaped gas-liquid separation piece is arranged on the inner wall of the gas-liquid separation chamber; a separation liquid through hole is arranged through the partition; an exhaust port is arranged on the wall of the gas-liquid separation chamber; when the carbon dioxide absorption device is in an assembled state, the gas-liquid separation chamber is arranged above the liquid recovery chamber in the direction of gravity; it also includes a spiral air pipe, the center line of which is a cylindrical spiral line; the air inlet of the spiral air pipe is arranged outside the shell; the air outlet of the spiral air pipe is arranged in the gas-liquid separation chamber; and a liquid spray port is arranged in the spiral air pipe.

2. A carbon dioxide absorption device according to claim 1, characterized in that: The gas-liquid separator comprises a base plate and a buckle strip buckled on the base plate; the cross section perpendicular to the long axis of the buckle strip is U-shaped; and air holes are arranged at the bottom of the buckle strip.

3. A carbon dioxide absorption device according to claim 2, characterized in that: The shape of the air hole includes two adjacent circles and a dumbbell shape formed by a detail connecting the two circles.

4. A carbon dioxide absorption device according to claim 1, characterized in that: The exhaust port is arranged on the first wall of the gas-liquid separation chamber; the second wall of the gas-liquid separation chamber is opposite to the first wall; and the gas outlet of the spiral air pipe is arranged toward the second wall.

5. A carbon dioxide absorption device according to claim 4, characterized in that: A grid formed by a plurality of spaced apart gas-liquid separation elements is arranged in the gas-liquid separation chamber; the grid is arranged between the exhaust port and the gas outlet of the spiral air pipe.

6. A carbon dioxide absorption device according to claim 4, characterized in that: A guide plate is arranged at the air outlet of the spiral air duct; the guide direction of the guide plate is toward a direction away from the second wall.

7. The carbon dioxide absorption device according to claim 1, characterized in that: A liquid outlet is arranged on the wall of the spiral air tube.

8. The carbon dioxide absorption device according to claim 1, characterized in that: In the direction of gravity, the lower edge of the air inlet of the spiral air duct in the direction of gravity is higher than the lowest point of the inner wall of the spiral air duct in the direction of gravity.

9. A carbon dioxide absorption device according to claim 8, characterized in that: A liquid outlet is arranged at the lowest point of the inner wall of the spiral air pipe in the gravity direction.

10. The carbon dioxide absorption device according to claim 1, characterized in that: The liquid spray port is arranged toward the direction of the air flow source.

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