A carbon dioxide absorbing device

Abstract

The application provides a carbon dioxide absorption device, which comprises a shell, the internal space of the shell is divided into multiple spaces by a partition plate, the spaces comprise: a gas-liquid separation cavity and a liquid recovery cavity; a protruding strip-shaped gas-liquid separation piece is arranged on the inner wall of the gas-liquid separation cavity; a separation liquid through hole is arranged through the partition plate; an exhaust port is arranged on 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 direction of gravity; the device further comprises a spiral air pipe, the center line of the spiral air pipe 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 cavity; a liquid injection port is arranged in the spiral air pipe. The application can be widely applied in the field of exhaust gas purification of a marine diesel engine system.

Description

Technical Field

[0001] This invention relates to a device for absorbing carbon dioxide from engine exhaust, and particularly to a device for absorbing carbon dioxide from the exhaust of marine diesel engines. Background Technology

[0002] Carbon dioxide, as a major greenhouse gas, is considered a key cause of the intensified greenhouse effect. Therefore, technologies to reduce carbon dioxide emissions are receiving increasing attention and development.

[0003] The exhaust gases emitted by marine diesel engines are 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 absorption of carbon dioxide by reacting with a chemical solvent (also known as a carbon dioxide absorbent). Alkaline chemical absorbents are typically used, such as ethanolamines, potassium hydroxide, and ammonia. Currently, the more mature chemical absorption processes are mostly based on aqueous solutions of ethanolamines, such as the monoethanolamine method (MEA method), diethanolamine method (DEA method), and methyldiethanolamine method (MDEA method).

[0004] The main component of existing carbon dioxide absorption devices for marine diesel engine exhaust is the absorption tower. The absorption tower can have multiple layers of trays with numerous small holes to allow for the flow of gas and liquid. The purpose of the trays is to ensure sufficient contact between the gas and liquid phases, thereby improving absorption efficiency. Common tray types include bubble cap trays, sieve trays, and valve trays. Packing can also be used to increase the gas-liquid contact area. However, existing absorption towers have a large volume, occupying valuable space on the ship; furthermore, the multiple layers of trays create significant resistance to exhaust gas emissions. Summary of the Invention

[0005] To address the problems of large size and high exhaust resistance in existing carbon dioxide absorption devices for marine diesel engines, this invention provides a carbon dioxide absorption device.

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

[0007] A carbon dioxide absorption device includes a housing, the interior of which is divided into a plurality of spaces by a partition, each space including a gas-liquid separation chamber and a liquid recovery chamber; a protruding strip-shaped gas-liquid separation element is provided on the inner wall of the gas-liquid separation chamber; a separation liquid through-hole is provided through the partition; an exhaust port is provided on the wall of the gas-liquid separation chamber; when the carbon dioxide absorption device is in the assembled state, the gas-liquid separation chamber is positioned above the liquid recovery chamber in the direction of gravity; it also includes a spiral gas pipe, the centerline of which is a cylindrical helix; the inlet of the spiral gas pipe is located outside the housing; the outlet of the spiral gas pipe is located inside the gas-liquid separation chamber; and a liquid spray port is provided inside the spiral gas pipe.

[0008] Optionally, the gas-liquid separator includes a substrate and a fastener attached to the substrate; the cross-section of the fastener perpendicular to its long axis is U-shaped; and an air hole is provided through the bottom of the fastener.

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

[0010] Optionally, the exhaust port is disposed 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; the exhaust port of the spiral air pipe is disposed facing the second wall.

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

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

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

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

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

[0016] Optionally, the spray nozzle is positioned facing the direction of the airflow source.

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

[0018] In this invention, the carbon dioxide absorption device mixes and reacts with carbon dioxide absorbent sprayed from the nozzle while the exhaust gas flows within a spiral gas tube, thereby absorbing the carbon dioxide. The spiral gas tube extends the flow path of the exhaust gas within a limited space, correspondingly extending the reaction time between the exhaust gas and the absorbent, allowing for a more complete carbon dioxide absorption reaction. The gas in the spiral gas tube enters the gas-liquid separation chamber through the outlet, where it collides with the gas-liquid separator, achieving gas-liquid separation. The separated liquid falls into the liquid recovery chamber under gravity for recycling, while the separated gas (purified gas) is discharged through the exhaust port of the gas-liquid separation chamber. Compared to existing technologies, this invention's carbon dioxide absorption device, by realizing gas-liquid mixing and reaction within the spiral gas tube, reduces gas flow resistance and, by allowing sufficient time for the absorption reaction within a limited space, reduces the device's size, thus achieving the objectives of this invention.

[0019] The further effects of the above-mentioned alternative methods will be explained in detail below with reference to specific implementation methods. Attached Figure Description

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

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

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

[0023] Figure 4 for Figure 3 The top view of the gas-liquid separator shown.

[0024] The markings in the image are explained as follows:

[0025] 101. Grille; 102. Second wall; 103. Baffle plate; 104. Air outlet; 105. Separator liquid through hole; 106. Air inlet; 107. Lowest point of spiral air pipe; 108. Liquid recovery chamber; 109. Spiral air pipe; 110. Baffle plate; 111. Exhaust port; 112. First wall; 113. Gas-liquid separator;

[0026] 201, Fastening strip; 202, Substrate; 203, Vent. Detailed Implementation

[0027] The technical solution of the present invention will be described in detail below with reference to 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 enclosed by a housing. To show the structure of the internal space, [details omitted]. Figure 1 The carbon dioxide absorption device shown here has a portion of its housing wall (located in...). Figure 1 The front wall of the shell in the middle and located at Figure 1 The top cover of the carbon dioxide absorption device. The internal space of the housing is divided into two chambers by a partition 110 in the direction of gravity: an upper gas-liquid separation chamber and a lower liquid recovery chamber 108. A separation liquid through hole 105 is provided on the partition 110 to connect the gas-liquid separation chamber and the liquid recovery chamber 108.

[0029] A long strip-shaped gas-liquid separator 113 is provided on the inner wall of the gas-liquid separation chamber. Inside the gas-liquid separation chamber, a grid 101 composed of several parallel and spaced gas-liquid separators 113 is also provided. 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 opposing and parallel planar walls inside the gas-liquid separation chamber. An exhaust port 111 is provided on the first wall 112.

[0030] Figure 1 The carbon dioxide absorption device shown also includes a spiral tube 109. The spiral tube 109 is a spirally wound pipe. The centerline of the spiral tube 109 is a cylindrical helix, i.e., in the shape of a helical spring. The air inlet 106 of the spiral tube 109 is located outside the housing. The air outlet 104 of the spiral tube 109 is located inside the gas-liquid separation chamber. The air outlet 104 faces the second wall 102. The front section of the spiral tube 109 in the airflow direction is located inside the liquid recovery chamber 108, and the rear section of the spiral tube 109 in the airflow direction is located inside the gas-liquid separation chamber. A liquid spray nozzle (not shown in the figure) is provided inside the spiral tube 109. The liquid spray nozzle is used to spray carbon dioxide absorbent into the spiral tube 109. The liquid spray nozzle is oriented towards the airflow source direction. Figure 1 As shown, in the direction of gravity, the lower edge of the spiral tube 109 is higher than the lowest point of the inner wall of the spiral tube 109 in the direction of gravity (i.e., the lowest point 107 of the spiral tube). The lowest point 107 of the spiral tube is located inside the liquid recovery chamber 108. A liquid outlet (not shown in the figure) is provided at the lowest point 107 of the spiral tube.

[0031] like Figure 1 and Figure 2 As shown, a guide plate 103 is provided at the air outlet 104. The guide plate 103 is used to guide the gas discharged from the air outlet 104 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 retaining strip 201. The substrate 202 is a long, rectangular strip. The length of the retaining strip 201 is equal to the length of the substrate 202. The cross-section of the retaining strip 201 perpendicular to its length direction is U-shaped. Along their length directions, the retaining strip 201 is fastened to the substrate 202, meaning the two raised edges of the cross-section of the retaining strip 201 connect to the surface of the substrate 202, thus forming a space enclosed by the retaining strip 201 and the substrate 202. An air hole 203 is provided at the bottom of the retaining strip 201 (at the bottom of the U-shape). The shape of the air hole 203 is approximately a dumbbell shape formed by two adjacent circles and a thin section 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 embodiments shown in the accompanying drawings will be described below to further illustrate the technical solution of the present invention.

[0034] The exhaust gas from the marine diesel engine enters the spiral pipe 109 through the air inlet 106. Carbon dioxide absorbent sprayed from the injection port mixes with the exhaust gas, resulting in a carbon dioxide absorption reaction. The mixed gas flows spirally upwards within the spiral pipe 109. Because the spiral pipe 109 extends the exhaust gas flow path within a limited space, it also prolongs the time the exhaust gas spends within the spiral pipe 109, allowing the aforementioned carbon dioxide absorption reaction to proceed more fully. The liquid produced by the carbon dioxide absorption reaction flows downwards in the spiral pipe 109 under 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 prevents the liquid from flowing further against the exhaust gas flow direction along the exhaust gas pipeline, thus avoiding damage to other parts of the diesel engine.

[0035] The gas discharged from the outlet 104 of the spiral pipe 109 will still contain droplets. If these droplets are discharged with the gas, they will pollute the environment. When the gas exits the spiral pipe 109 from the outlet 104, it flows away from the second wall 102 under the guidance of the guide plate 103. During this flow, the gas collides with the gas-liquid separator 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 further flows towards the grid 101. Figure 2 As shown, the bottom of the buckle 201 of the gas-liquid separator 113 in the grille 101 is positioned facing the gas source direction. Figure 3As shown, after the gas collides with the gas-liquid separator 113 from multiple angles, part of it collides with the substrate 202 and the retaining strip 201 to produce a gas-liquid separation effect, while the other part enters the space between the retaining strip 201 and the substrate 202 through the vent 203, where it collides more frequently with the inner wall of the space before being discharged through the vent 203. The shape of the vent 203 disturbs the airflow, making the collisions more intense and thus enhancing the gas-liquid separation effect. The gas passing through the grille 101 is discharged through the exhaust port 111. The liquid separated in the gas-liquid separation chamber flows into the liquid recovery chamber 108 under the action of gravity through the separation liquid through hole 105.

[0036] It is worth noting that the above description 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 structure of the various components described above, or replace them with technical equivalents. Therefore, all equivalent structural changes made based on the description and illustrations of the present invention, or direct or indirect applications to other related technical fields, are similarly included within the scope of the present invention.

Claims

1. A carbon dioxide absorption device, comprising a housing, characterized in that: The internal space of the housing is divided into two spaces by a partition, each space including a gas-liquid separation chamber and a liquid recovery chamber. A protruding strip-shaped gas-liquid separation element is provided on the inner wall of the gas-liquid separation chamber. A separation liquid passage is provided through the partition. An exhaust port is provided on the wall of the gas-liquid separation chamber. When the carbon dioxide absorption device is in the assembled state, the gas-liquid separation chamber is positioned above the liquid recovery chamber in the direction of gravity. The device also includes a spiral gas pipe, the centerline of which is a cylindrical helix. The inlet of the spiral gas pipe is located outside the housing. The outlet of the spiral gas pipe is located inside the gas-liquid separation chamber. A liquid spray nozzle is provided inside the spiral gas pipe. The gas-liquid separator includes a substrate and a fastener attached to the substrate; the substrate is rectangular in shape, the length of the fastener is equal to the length of the substrate, and the cross-section of the fastener perpendicular to its length direction is U-shaped; an air hole is provided through the bottom of the fastener. The shape of the pores includes two adjacent circles and a dumbbell shape formed by the details connecting the two circles.

2. The carbon dioxide absorption device according to claim 1, characterized in that: The exhaust port is located 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; the exhaust port of the spiral air pipe is oriented towards the second wall.

3. The carbon dioxide absorption device according to claim 2, characterized in that: A grid formed by several spaced gas-liquid separation elements is provided inside the gas-liquid separation chamber; the grid is located between the exhaust port and the outlet of the spiral gas pipe.

4. The carbon dioxide absorption device according to claim 2, characterized in that: A guide plate is provided at the outlet of the spiral air pipe; the guide plate is directed away from the second wall.

5. The carbon dioxide absorption device according to claim 1, characterized in that: A liquid outlet is provided on the wall of the spiral gas pipe.

6. 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 tube is higher than the lowest point of the inner wall of the spiral tube in the direction of gravity.

7. The carbon dioxide absorption device according to claim 6, characterized in that: An outlet is provided at the lowest point of the inner wall of the spiral gas tube in the direction of gravity.

8. The carbon dioxide absorption device according to claim 1, characterized in that: The liquid injection nozzle is positioned facing the direction of the airflow source.

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