Rotatable molecular sieve adsorber with enhanced regeneration

Abstract

The application discloses a rotatable molecular sieve adsorber with reinforced regeneration structure and relates to the technical field of adsorbers, which comprises a shell, a horizontal circular tray is arranged in the shell, a first cylinder, a second cylinder and a third cylinder are sequentially arranged from inside to outside on the circular tray, a rotating shaft is fixedly arranged at the bottom of the circular tray and located at the middle position, and a supporting leg is arranged around the rotating shaft and is attached to the shell; a first air hole is formed in the position corresponding to the first cylinder at the top of the shell, and a second air hole is formed in the bottom of the shell. The rotatable molecular sieve adsorber with the reinforced regeneration structure can make raw gas uniformly contact with molecular sieves in each part, thereby improving the overall adsorption efficiency of the molecular sieves. In the regeneration process, the regeneration gas can uniformly contact with the molecular sieves in each part, thereby improving the adsorption performance of the regenerated molecular sieves, and the overall operation efficiency of the adsorber and the product quality are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adsorbers, in particular to a molecular sieve adsorber that is rotatable and has a reinforced regeneration structure. BACKGROUND

[0002] Molecular sieve adsorbers are widely used in the fields of air separation and purification, and are mainly used to remove impurities such as carbon dioxide, water, and hydrocarbons in air. The working process of a molecular sieve adsorber is divided into two stages: adsorption and regeneration. When the adsorber is working normally, the gas flow enters from the inlet of the adsorber, passes through the adsorbent bed, and flows out from the outlet of the adsorber. During the regeneration process, the regeneration gas enters the adsorber from the regeneration inlet, passes through the adsorbent bed, and flows out from the regeneration outlet.

[0003] Common molecular sieve adsorbers are mostly fixed bed structures. For example, the Chinese utility model patent with publication number CN214680908U discloses a horizontal molecular sieve adsorber, which includes a sealed adsorber shell, a molecular sieve net is arranged in the adsorber shell, molecular sieve particles are arranged in the molecular sieve net, a feed inlet and a discharge outlet are arranged at the top and bottom of the adsorber shell respectively, a feed inlet cover and a discharge outlet cover are arranged at the feed inlet and the discharge outlet respectively, first and second shunt plates are arranged at the two sides of the molecular sieve net, and first and second filter nets are arranged at one side of the first and second shunt plates respectively.

[0004] In the adsorption process of the above-mentioned molecular sieve adsorber, when the raw gas passes through the molecular sieve layer, uneven gas distribution can easily cause some molecular sieves to be saturated quickly, some molecular sieves to be saturated slowly, and the overall adsorption efficiency of the molecular sieves to be difficult to fully develop. In addition, in the regeneration stage, traditional regeneration methods such as heating and nitrogen blowing are often more sufficient for the regeneration of some molecular sieves and insufficient for the regeneration of some molecular sieves, which limits the recovery of the adsorption performance of the regenerated molecular sieves and affects the overall operation efficiency and product quality of the adsorber. SUMMARY

[0005] The present application aims to provide a molecular sieve adsorber that is rotatable and has a reinforced regeneration structure to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solution: a molecular sieve adsorber that is rotatable and has a reinforced regeneration structure, including a shell, a horizontal circular tray is installed in the shell, a first cylinder, a second cylinder, and a third cylinder are installed on the circular tray from the inside to the outside in sequence, a rotating shaft is fixedly installed at the bottom of the circular tray at the middle position, and a supporting leg is arranged around the rotating shaft and is attached to the shell; a first air hole is formed at the top of the shell corresponding to the position of the first cylinder, and a second air hole is formed at the bottom of the shell.

[0007] As a preferred technical scheme of the present application, the circumferential surface of the circular tray is uniformly provided with blades.

[0008] As a preferred technical scheme of the present application, the bottom of the supporting leg is movably provided with a steel ball, and the bottom of the shell is provided with an annular groove matched with the steel ball.

[0009] As a preferred technical scheme of the present application, the top surfaces of the first, second and third cylinders are in close contact with the top of the shell.

[0010] As a preferred technical scheme of the present application, two vertical lead screws are movably arranged in the shell, and an annular plate is arranged on the two lead screws; the inner and outer surfaces of the annular plate are in close contact with the third cylinder and the shell, respectively.

[0011] As a preferred technical scheme of the present application, a gear is fixedly arranged on the bottom end of the lead screw, and a gear ring engaged with the gear is fixedly arranged on the supporting leg through a supporting arm.

[0012] As a preferred technical scheme of the present application, a plurality of square grooves penetrating through the annular plate are uniformly arranged on the annular plate along the circumferential direction of the annular plate, two silica gel pieces are fixedly arranged on the upper surface of the annular plate at positions corresponding to the square grooves, and a baffle plate is fixedly arranged on the upper surface of the annular plate for sealing the side surfaces of the silica gel pieces.

[0013] As a preferred technical scheme of the present application, a rigid tube located below the annular plate is fixedly arranged on the inner wall of the shell at a position corresponding to the square grooves through a support.

[0014] As a preferred technical scheme of the present application, a first feeding port is arranged on the top of the shell at a position corresponding to the space between the first and second cylinders, and a second feeding port is arranged on the top of the shell at a position corresponding to the space between the second and third cylinders.

[0015] As a preferred technical scheme of the present application, a first discharging port is arranged on the circular tray at a position corresponding to the space between the first and second cylinders, and a second discharging port is arranged on the circular tray at a position corresponding to the space between the second and third cylinders, and the first and second discharging ports are in position correspondence with the second air hole.

[0016] In the above technical scheme, the first, second and third cylinders in the shell can rotate synchronously with the circular tray, the molecular sieve between the first and second cylinders and the aluminum gel between the second and third cylinders can also rotate, so that the raw gas can be in contact with the molecular sieve in each part more uniformly during the adsorption process, thereby improving the overall adsorption efficiency of the molecular sieve. During the regeneration process, the regeneration gas can be in contact with the molecular sieve in each part more uniformly, thereby improving the adsorption performance of the regenerated molecular sieve and ensuring the overall operation efficiency of the adsorber and the product quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A first perspective view of a rotatable molecular sieve adsorber with a reinforced regeneration structure;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram of the first state of the silicone sheet in the embodiment;

[0021] Figure 4 This is a schematic diagram of the second state of the silicone sheet in the embodiment;

[0022] Figure 5 A second perspective view of a rotatable molecular sieve adsorber with a reinforced regeneration structure;

[0023] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 This is a three-dimensional structural diagram of the first sealing plate and the second sealing plate.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Shell; 101. First vent; 102. Second vent; 2. Round tray; 3. First cylinder; 4. Second cylinder; 5. Third cylinder; 6. Shaft; 7. Support leg; 8. Blade; 9. Steel ball; 10. Lead screw; 11. Annular plate; 1101. Square groove; 12. Gear; 13. Gear ring; 14. Silicone sheet; 15. Baffle; 16. Rigid tube; 17. First sealing plate; 1701. First discharge port; 18. Second sealing plate; 1801. Second discharge port; 19. Rubber sheet. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figure 1 and Figure 6As shown, the embodiment provides a rotatable molecular sieve adsorber with reinforced regeneration structure, which comprises a cylindrical shell 1, a horizontal circular tray 2 is installed in the shell 1, the circular tray 2 is coaxial with the shell 1, and a first cylinder 3, a second cylinder 4 and a third cylinder 5 are sequentially installed on the circular tray 2 from inside to outside and coaxial with the circular tray 2. The top surfaces of the first cylinder 3, the second cylinder 4 and the third cylinder 5 are all in contact with the top of the shell 1. A rotating shaft 6 coaxial with the circular tray 2 and a supporting leg 7 surrounding the rotating shaft 6 are fixedly installed at the bottom of the circular tray 2, a steel ball 9 is movably installed at the bottom of the supporting leg 7, and an annular groove matched with the steel ball 9 is formed on the upper surface of the bottom of the shell 1. A speed reducer motor for driving the rotating shaft 6 to rotate is installed at the bottom of the shell 1. A first air hole 101 flush with the edge of the first cylinder 3 is formed at the top of the shell 1 corresponding to the position of the first cylinder 3, and a second air hole 102 is formed at the bottom of the shell 1.

[0030] It should be noted that, in order to facilitate the display of the structure of the shell 1 inside, Figure 1 and Figure 6 part of the structure of the shell 1 is omitted. The first cylinder 3, the second cylinder 4 and the third cylinder 5 are hollow, Figure 1 in order to facilitate the display, the middle part of the first cylinder 3, the second cylinder 4 and the third cylinder 5 is removed. The first cylinder 3, the second cylinder 4 and the third cylinder 5 are all made of heat-resistant plastic or metal plate, with a thickness of 1-2mm.

[0031] Specifically, the first cylinder 3 and the second cylinder 4 are filled with molecular sieve, and the second cylinder 4 and the third cylinder 5 are filled with aluminum gel. In the adsorption process, the raw gas is transported into the shell 1 through the second air hole 102, and passes through the third cylinder 5, the third cylinder 5 and the first cylinder 3 in turn. The raw gas contacts the aluminum gel and the molecular sieve in turn, and the gas adsorbed by the aluminum gel and the molecular sieve passes through the first air hole 101 through the first cylinder 3 and is discharged from the top of the shell 1. In the above process, the speed reducer motor drives the rotating shaft 6, the circular tray 2, the first cylinder 3, the second cylinder 4 and the third cylinder 5 to rotate synchronously, so that the raw gas can be in contact with the molecular sieve of each part more uniformly, and the overall adsorption efficiency of the molecular sieve is improved. In the regeneration process, the regeneration gas enters the shell 1 from the first air hole 101, and passes through the first cylinder 3, the second cylinder 4 and the third cylinder 5 in turn. The regeneration gas contacts the molecular sieve and the aluminum gel in turn, and then is discharged from the bottom of the shell 1 through the second air hole 102.

[0032] As shown in Figure 5 the circumferential surface of the circular tray 2 is uniformly provided with blades 8, the circular tray 2 drives the blades 8 to rotate synchronously when rotating, the blades 8 disperse the raw gas, promote the uniform distribution of the raw gas in the horizontal direction, and further improve the adsorption uniformity of the molecular sieve.

[0033] In actual work, in the adsorption process, the raw gas at the bottom is more likely to pass through the aluminum gel and molecular sieve, while the raw gas at the top is not easy to pass through the aluminum gel and molecular sieve; in the regeneration process, the regeneration gas at the top is more likely to pass through the molecular sieve and aluminum gel, while the regeneration gas at the bottom is not easy to pass through the molecular sieve and aluminum gel. In order to solve this problem, the embodiment also has the following design.

[0034] As shown in Figure 1 and Figure 6 , two vertical lead screws 10 are rotatably installed in the shell 1, and an annular plate 11 is jointly installed on the two lead screws 10; the inner and outer circumferential surfaces of the annular plate 11 are respectively attached to the third cylinder 5 and the shell 1, thereby dividing the shell 1 into two parts; a gear 12 is fixedly sleeved on the bottom end of the lead screw 10, and a tooth ring 13 engaged with the gear 12 is fixedly installed on the leg 7 through a support arm. When the circular tray 2 drives the leg 7 to rotate around the rotating shaft 6, the tooth ring 13 also rotates synchronously, and drives the gear 12 engaged therewith to rotate, and the gear 12 drives the lead screw 10 to rotate, thereby driving the annular plate 11 to move in the vertical direction. As long as the rotating direction of the rotating shaft 6 is controlled by the speed reducer motor, the annular plate 11 can be raised and lowered. Specifically, when the rotating shaft 6 rotates forward, the annular plate 11 rises, and when the rotating shaft 6 reverses, the annular plate 11 descends.

[0035] As shown in Figures 1-5 , a plurality of square slots 1101 penetrating the annular plate 11 are uniformly provided on the annular plate 11 in the circumferential direction, two silica gel sheets 14 are fixedly installed on the upper surface of the annular plate 11 corresponding to the positions of the square slots 1101, and a baffle 15 for sealing the side surfaces of the silica gel sheets 14 is fixedly installed on the upper surface of the annular plate 11; a rigid tube 16 located below the annular plate 11 is fixedly installed on the inner wall of the shell 1 corresponding to the positions of the square slots 1101. It should be noted that the silica gel material involved in the embodiment is heat-resistant silica gel with a heat-resistant temperature of not less than 200°C. The two silica gel sheets 14 are in the state shown in Figure 2 and Figure 3 , i.e. the top extends upward and abuts against each other, and the side surfaces of the two silica gel sheets 14 abut against the baffle 15, thereby playing a role of closing the square slots 1101.

[0036] Specifically, in the adsorption process, in the initial state, the annular plate 11 is located at the lowest point of its vertical direction stroke, at which time the state of the rigid tube 16 and the two silica gel sheets 14 is as shown in Figure 4 , the raw gas enters the inside of the shell 1 from the second air hole 102, fills the area below the annular plate 11, and then enters the area above the annular plate 11 through the rigid tube 16 and fills the area above the annular plate 11, during which the circular tray 2 remains in a stationary state. Subsequently, the rotating shaft 6 and the circular tray 2 are driven by the speed reducer motor to rotate forward, the annular plate 11 begins to rise, the silica gel sheets 14 are separated from the rigid tube 16 and enterFigure 3 The state shown is the closed state of the groove 1101. As the annular plate 11 continues to rise, it continuously compresses the raw material gas above it, promoting the raw material gas to pass through the aluminum glue and molecular sieve. After the annular plate 11 reaches the top of its vertical stroke, the reduction motor drives the rotating shaft 6 and the circular tray 2 to rotate in the opposite direction, and the annular plate 11 begins to descend. The air pressure in the area above the annular plate 11 gradually decreases, and the raw material gas below it exerts a force on the two closely attached silica gel sheets 14, creating a gap between the two silica gel sheets 14, allowing the raw material gas to enter the area above the annular plate 11 until the annular plate 11 returns to the bottom of its vertical stroke, and then the above steps continue to be repeated. In this way, during the adsorption process, the annular plate 11 can promote the passage of the upper raw material gas through the aluminum glue and molecular sieve.

[0037] During the regeneration process, in the initial state, the annular plate 11 is located Figure 1 As shown, regenerated gas enters the housing 1 through the first vent 101, fills the first cylinder 3, and then passes through the molecular sieve and aluminum glue. During this process, the circular tray 2 remains stationary. Subsequently, the geared motor drives the rotating shaft 6 and the circular tray 2 to rotate forward, causing the annular plate 11 to rise. The air pressure in the area above the annular plate 11 increases, making it difficult for the regenerated gas to enter the high-pressure area. It can only descend and pass through the molecular sieve and aluminum glue from the area below the annular plate 11. After the annular plate 11 reaches the top of its vertical travel, the geared motor drives the rotating shaft 6 and the circular tray 2 to rotate in the opposite direction, causing the annular plate 11 to descend. The air pressure in the area above the annular plate 11 gradually decreases, allowing the regenerated gas to pass through the molecular sieve and aluminum glue from the area above the annular plate 11. The annular plate 11 descends to... Figure 1 After reaching the indicated position, repeat the above steps. Thus, during regeneration, the annular plate 11 facilitates the passage of the lower regeneration gas through the molecular sieve and alumina gel.

[0038] The first feeding port is arranged at the position corresponding to the first cylinder 3 and the second cylinder 4 on the top of the shell 1, and the second feeding port is arranged at the position corresponding to the second cylinder 4 and the third cylinder 5. The first discharging port and the second discharging port are arranged at the positions corresponding to the first cylinder 3 and the second cylinder 4 and the second cylinder 4 and the third cylinder 5 on the circular tray 2 respectively, and the first discharging port and the second discharging port are in position correspondence with the second air hole 102. The first feeding port, the second feeding port, the first discharging port and the second discharging port are all equipped with a sealing plug through threaded cooperation. After a period of use, the molecular sieve and the aluminum gel need to be replaced. The operator removes the pipeline connected at the position of the second air hole 102, then controls the rotation of the circular tray 2 through the speed reducer, until the first discharging port and the second discharging port are in position correspondence with the second air hole 102, then opens the sealing plug, and lets the aluminum gel and the molecular sieve fall freely. When there is no more aluminum gel and molecular sieve falling, the sealing plug is installed, then the circular tray 2 is controlled to rotate through the speed reducer, until the first discharging port and the second discharging port of the next group are in position correspondence with the second air hole 102, and the sealing plug is continuously opened to discharge.

[0039] Embodiment 2

[0040] Since the circular tray 2 rotates during work, the molecular sieve will also move, and powder will be generated after a long time of work, so that the volume of the molecular sieve becomes smaller, and the powder will fill between adjacent molecular sieves, and the same is true for the aluminum gel. This will cause the aluminum gel and the molecular sieve in the top area to be unable to fill the corresponding area, and the raw gas may escape from the vacancy area. To solve this problem, the embodiment is designed as follows.

[0041] As shown in Figure 7 the first sealing plate 17 is slidably installed between the first cylinder 3 and the second cylinder 4 in the vertical direction, and the second sealing plate 18 is slidably installed between the second cylinder 4 and the third cylinder 5 in the vertical direction. In the initial state, the first sealing plate 17 and the second sealing plate 18 are in close contact with the top of the shell 1, the molecular sieve below the first sealing plate 17 supports the first sealing plate 17, and the aluminum gel below the second sealing plate 18 supports the second sealing plate 18. When the molecular sieve is worn, the first sealing plate 17 will be lowered, and when the aluminum gel is worn, the second sealing plate 18 will be lowered. In this way, the first sealing plate 17 and the second sealing plate 18 play a blocking role for the raw gas, and the raw gas cannot escape.

[0042] As shown in Figure 7As shown, the first sealing plate 17 is provided with a first discharging port 1701 at a position corresponding to the first feeding port, and the second sealing plate 18 is provided with a second discharging port 1801 at a position corresponding to the second feeding port. The first sealing plate 17 is provided with a rubber sheet 19 at a position corresponding to the first discharging port 1701, and the second sealing plate 18 is provided with a rubber sheet 19 at a position corresponding to the second discharging port 1801. The rubber sheet 19 is provided with a cross-shaped opening in the middle by cutting, and the rubber sheet 19 is in a horizontal state when no external force is applied, i.e., the cross-shaped opening is in a closed state. The first sealing plate 17 and the second sealing plate 18 are both made of PPS material, the outer ring of the first sealing plate 17 is fixedly provided with a magnet ring, and the inner ring of the second sealing plate 18 is provided with an iron ring, so that the first sealing plate 17 and the second sealing plate 18 can be jointly raised and lowered through the mutual attraction between the magnet ring and the iron ring. The outer ring of the second sealing plate 18 is fixedly provided with a magnet ring, and the inner ring of the annular plate 11 is fixedly provided with an iron ring, so that the annular plate 11 can drive the first sealing plate 17 and the second sealing plate 18 to jointly rise and fall through the mutual attraction between the magnet ring and the iron ring.

[0043] Specifically, during the feeding process, the annular plate 11 rises, breaks through the vertical stroke high point in the working process, and continues to rise, and drives the first sealing plate 17 and the second sealing plate 18 to rise synchronously through the magnetic force, until the first sealing plate 17 and the second sealing plate 18 are attached to the top of the shell 1, i.e., there is no gap between the first feeding port and the first discharging port 1701, and there is no gap between the second feeding port and the second discharging port 1801. In this way, during the feeding process, the molecular sieve and the aluminum gel can easily pass through the rubber sheet 19 and enter the inside of the shell 1, and the cross-shaped opening in the middle of the rubber sheet 19 is opened in this process.

[0044] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A rotatable molecular sieve adsorber with a reinforced regeneration structure, comprising a shell (1), a horizontal circular tray (2) installed inside the shell (1), and a first cylinder (3), a second cylinder (4), and a third cylinder (5) sequentially installed on the circular tray (2) from the inside out, characterized in that, The bottom of the round tray (2) is fixedly installed with a rotating shaft (6) located in the middle position and a support foot (7) surrounding the rotating shaft (6) and fitting against the shell (1); the top of the shell (1) is provided with a first vent hole (101) corresponding to the position of the first cylinder (3), and the bottom of the shell (1) is provided with a second vent hole (102). The top surfaces of the first cylinder (3), the second cylinder (4), and the third cylinder (5) are all in contact with the top of the shell (1); two vertical lead screws (10) are rotatably installed inside the shell (1), and an annular plate (11) is installed on both lead screws (10); the inner and outer sides of the annular plate (11) are in contact with the third cylinder (5) and the shell (1) respectively; several square grooves (1101) are evenly opened along the circumference of the annular plate (11), and two silicone sheets (14) are fixedly installed on the upper surface of the annular plate (11) at the position corresponding to the square grooves (1101), and a baffle (15) for sealing the side of the silicone sheet (14) is fixedly installed on the upper surface of the annular plate (11); a rigid tube (16) located below the annular plate (11) is fixedly installed on the inner wall of the shell (1) at the position corresponding to the square grooves (1101) by a bracket. Molecular sieves are filled between the first cylinder (3) and the second cylinder (4), and aluminum glue is filled between the second cylinder (4) and the third cylinder (5). During the adsorption process, in the initial state, the annular plate (11) is located at the lowest point of its vertical stroke. The raw material gas enters the interior of the shell (1) through the second vent (102), fills the area below the annular plate (11), and then enters the area above the annular plate (11) through the rigid tube (16), filling the area above the annular plate (11). During this process, the circular tray (2) remains stationary. Subsequently, the rotating shaft (6) and the circular tray (2) are driven to rotate in the forward direction by the reduction motor, and the annular plate (11) begins to rise. The silica gel sheet (14) separates from the rigid tube (16) and enters the closed state of the opposite groove (1101). 11) During the continued upward process, the raw material gas above it is continuously squeezed, promoting the raw material gas above it to pass through the aluminum glue and molecular sieve; after the annular plate (11) reaches the top of its vertical stroke, the reduction motor drives the rotating shaft (6) and the round tray (2) to rotate in opposite directions, the annular plate (11) begins to descend, the air pressure in the area above the annular plate (11) gradually decreases, and the raw material gas below it will exert a force on the two mutually attached silica gel sheets (14), so that a gap is created between the two silica gel sheets (14), and the raw material gas can enter the area above the annular plate (11) until the annular plate (11) returns to the bottom of its vertical stroke, and then the above steps are repeated; in this way, during the adsorption process, the annular plate (11) can promote the raw material gas above to pass through the aluminum glue and molecular sieve.

2. The rotatable molecular sieve adsorber with a reinforced regeneration structure according to claim 1, characterized in that, The circular tray (2) has blades (8) evenly installed on its circumferential surface.

3. The rotatable molecular sieve adsorber with a reinforced regeneration structure according to claim 1, characterized in that, A steel ball (9) is movably installed at the bottom of the support leg (7), and an annular groove that mates with the steel ball (9) is opened at the bottom of the housing (1).

4. The rotatable molecular sieve adsorber with a reinforced regeneration structure according to claim 1, characterized in that, The bottom end of the lead screw (10) is fixedly fitted with a gear (12), and the support leg (7) is fixedly installed with a gear ring (13) that meshes with the gear (12) via a support arm.

5. The rotatable molecular sieve adsorber with a reinforced regeneration structure according to claim 4, characterized in that, The top of the shell (1) is provided with a first feed port at the position between the first cylinder (3) and the second cylinder (4), and a second feed port is provided at the position between the second cylinder (4) and the third cylinder (5).

6. The rotatable molecular sieve adsorber with a reinforced regeneration structure according to claim 5, characterized in that, The circular tray (2) has a first discharge port at the position between the first cylinder (3) and the second cylinder (4), and a second discharge port at the position between the second cylinder (4) and the third cylinder (5). Both the first discharge port and the second discharge port correspond to the position of the second vent (102).

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