Nitrogen water-sealed tank

Abstract

The utility model relates to the field of chemical engineering, in particular to a nitrogen water-sealed tank. The problems that amine liquid in an existing amine liquid buffer tank makes contact with air, air pressure in the tank changes, a tank body is damaged, and a trace amount of hydrogen sulfide in the amine liquid has the risk of leakage in the tank are mainly solved. The nitrogen water-sealed tank comprises an upper barrel (11) and a lower barrel (3), a partition plate (6) is arranged between the upper barrel (11) and the lower barrel (3), a communicating pipe (4) penetrates through the partition plate (6), the upper end and the lower end of the communicating pipe (4) are located in the middle of the upper barrel (11) and the middle of the lower barrel (3) respectively, a water inlet pipe (13), a gas inlet (14) and an air inlet (15) are formed in the top of the upper barrel (11), and an overflow port (19) and a water outlet (18) are formed in the bottom of the lower barrel (3). The nitrogen water-sealed tank can seal amine liquid, prevent the amine liquid from being in contact with air, and meanwhile avoid leakage of hydrogen sulfide.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a nitrogen water-sealed tank. Background Art

[0002] At present, there is amine liquid in the amine liquid buffer tank of the cracking unit refining system. The amine liquid in the tank will oxidize and deteriorate when it comes into contact with air, causing the air pressure in the tank to change, resulting in excessive expansion or contraction of the tank body and causing damage; at the same time, the amine liquid contains trace amounts of hydrogen sulfide in the tank, which poses a risk of leakage. Summary of the invention

[0003] In order to overcome the shortcomings of the existing amine liquid buffer tank, that is, the amine liquid in the tank contacts with the air, causing the air pressure in the tank to change and thus damaging the tank body, and the trace amount of hydrogen sulfide in the amine liquid existing in the tank has the risk of leakage, the utility model provides a nitrogen water-sealed tank, which can seal the amine liquid to prevent the amine liquid from contacting with the air and preventing the leakage of hydrogen sulfide.

[0004] The technical solution of the utility model is: a nitrogen water seal tank, comprising an upper cylinder and a lower cylinder, the upper cylinder and the lower cylinder are connected by a flange, a partition is arranged between the upper cylinder and the lower cylinder, a connecting pipe passes through the partition, the upper and lower ends of the connecting pipe are respectively located in the middle of the upper cylinder and the lower cylinder, a water inlet pipe, a gas inlet and an air inlet are respectively arranged on the top of the upper cylinder, and an overflow port and a drain port are arranged at the bottom of the lower cylinder.

[0005] Furthermore, the lower end of the water inlet pipe is located lower than the upper end opening of the connecting pipe.

[0006] Furthermore, a vertical overflow plate is fixed on the bottom plate inside the lower cylinder, the overflow plate is located between the overflow port and the drain port, and the height of the overflow plate is higher than the bottom opening of the connecting pipe.

[0007] Furthermore, a gas outlet is provided on one side of the lower cylinder.

[0008] Furthermore, a heating pipe is wound around the outer wall of the upper cylinder, and both ends of the heating pipe are an upper hot water inlet and an upper hot water outlet.

[0009] Furthermore, a heating pipe is wound around the outer wall of the lower cylinder, and two ends of the heating pipe are a lower hot water inlet and a lower hot water outlet.

[0010] Furthermore, a thermal insulation support ring is fixed at the bottom of the outer wall of the lower cylinder, and a support leg is fixed at the bottom of the thermal insulation support ring.

[0011] The utility model has the following beneficial effects: due to the adoption of the above scheme, the nitrogen water seal tank can prevent the amine liquid buffer tank from expanding and contracting due to pressure changes to damage the tank body, nitrogen is filled into the amine liquid tank to prevent the amine liquid from contacting with the air, and the water seal plays an effective sealing role on the small amount of hydrogen sulfide gas remaining in the amine liquid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 is along Figure 1 Cross-sectional view of BB.

[0014] In the figure, 1-support leg, 2-overflow plate, 3-lower cylinder, 4-connecting pipe, 5-flange, 6-partition, 7-lower hot water inlet, 8-lower hot water outlet, 9-upper hot water outlet, 10-upper hot water inlet, 11-upper cylinder, 12-head, 13-water inlet pipe, 14-gas inlet, 15-air inlet, 16-gas outlet, 17-insulation support ring, 18-drain outlet, 19-overflow outlet, 20-heating pipe. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by "up", "down", "left", "right", "inside", "outside", "top" and "bottom" are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0017] Depend on Figure 1As shown, a nitrogen water seal tank comprises an upper cylinder 11 and a lower cylinder 3. The upper end of the upper cylinder 11 is connected to a head 12. The upper cylinder 11 and the lower cylinder 3 are connected by a flange 5. A gasket is provided at the connection of the flange 5. A partition 6 is provided between the upper cylinder 11 and the lower cylinder 3. The flange bolts pass through the partition 6 to fix the partition 6 with the upper and lower cylinders. A connecting pipe 4 passes through the middle of the partition 6. The upper end opening of the connecting pipe 4 is located in the middle of the upper cylinder 11, and the lower end opening is located in the middle and lower part of the lower cylinder 3, so as to connect the upper and lower cylinders. A water inlet pipe 13, a gas inlet 14 and an air inlet 15 are provided at the top of the upper cylinder 11, respectively. The lower end of the water inlet pipe 13 is located below the upper end opening of the connecting pipe 4. The lower end of the air inlet 15 is lower than the upper end opening of the connecting pipe 4 and higher than the lower end opening of the water inlet pipe 13. The gas inlet 14 is opened at the top of the upper cylinder 11, so that nitrogen can be filled into the cylinder. The side wall of the lower cylinder 3 is provided with a gas outlet 16, and the position of the gas outlet 16 is higher than the lower end opening of the connecting pipe 4. The bottom of the lower cylinder 3 is provided with an overflow port 19 and a drain port 18. A vertical overflow plate 2 is fixed on the bottom plate inside the lower cylinder 3. The overflow plate 2 is located between the overflow port 19 and the drain port 18, and the height of the overflow plate 2 is higher than the bottom opening of the connecting pipe 4.

[0018] Depend on Figure 2 As shown, the outer wall of the upper cylinder 11 is wrapped with a heat tracing pipe 20, and the two ends of the heat tracing pipe 20 are an upper hot water inlet 10 and an upper hot water outlet 9. Similarly, the outer wall of the lower cylinder 3 is wrapped with a lower heat tracing pipe, and the two ends of the lower heat tracing pipe are a lower hot water inlet 7 and a lower hot water outlet 8. The upper and lower heat tracing pipes play a role of heat tracing, and heat the upper and lower cylinders through hot water circulation. The bottom of the outer wall of the lower cylinder 3 is fixed with a heat preservation support ring 17, and the bottom of the heat preservation support ring 17 is fixed with a support leg 1, so that the upper and lower cylinders are fixed to the ground.

[0019] The lower cylinder 3 contains amine liquid, and water is injected into the upper cylinder 11 through the water inlet 13, and nitrogen is injected into the upper cylinder 11 through the gas inlet 14. When the pressure in the lower cylinder 3 decreases, the nitrogen flows into the lower cylinder through the connecting pipe, which can prevent the amine liquid from contacting with the air. When the pressure in the lower cylinder 3 increases, the nitrogen returns to the upper cylinder 11 through the connecting pipe 4, so that the water level in the upper cylinder 11 rises. When the water surface in the upper cylinder 11 is higher than the upper plane of the connecting pipe 4, water enters the lower cylinder 3 through the connecting pipe 4 and is discharged from the drain port 18 until the height of the water column and the pressure reach a new balance.

[0020] The nitrogen water seal tank can prevent the amine liquid buffer tank from expanding and contracting due to pressure changes and damaging the tank body. Nitrogen is filled into the amine liquid tank to prevent the amine liquid from contacting with the air, and the water seal effectively seals the small amount of hydrogen sulfide gas remaining in the amine liquid tank.

[0021] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A nitrogen water seal tank, comprising an upper cylinder (11) and a lower cylinder (3), wherein the upper cylinder (11) and the lower cylinder (3) are connected via a flange (5), characterized in that: A partition (6) is provided between the upper cylinder (11) and the lower cylinder (3), a connecting pipe (4) passes through the partition (6), and the upper and lower ends of the connecting pipe (4) are respectively located in the middle of the upper cylinder (11) and the lower cylinder (3), and a water inlet pipe (13), a gas inlet (14) and an air inlet (15) are respectively provided at the top of the upper cylinder (11), and an overflow port (19) and a drain port (18) are provided at the bottom of the lower cylinder (3).

2. The nitrogen water seal tank according to claim 1, characterized in that: The lower end of the water inlet pipe (13) is located lower than the upper end opening of the connecting pipe (4).

3. The nitrogen water seal tank according to claim 2, characterized in that: A vertical overflow plate (2) is fixed on the bottom plate inside the lower cylinder (3); the overflow plate (2) is located between the overflow port (19) and the drain port (18); and the height of the overflow plate (2) is higher than the bottom opening of the connecting pipe (4).

4. The nitrogen water seal tank according to claim 3, characterized in that: A gas outlet (16) is provided on one side of the lower cylinder (3).

5. The nitrogen water seal tank according to claim 4, characterized in that: A heating pipe (20) is wound around the outer wall of the upper cylinder (11), and the two ends of the heating pipe (20) are an upper hot water inlet (10) and an upper hot water outlet (9).

6. The nitrogen water seal tank according to claim 5, characterized in that: A heating pipe is wound around the outer wall of the lower cylinder (3), and the two ends of the heating pipe are a lower hot water inlet (7) and a lower hot water outlet (8).

7. The nitrogen water seal tank according to claim 6, characterized in that: A heat-insulating support ring (17) is fixed to the bottom of the outer wall of the lower cylinder (3), and a support leg (1) is fixed to the bottom of the heat-insulating support ring (17).

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