Novel natural gas liquefaction dehydration and demercuration device

Abstract

The utility model discloses a novel natural gas liquefaction dehydration demercuration device, which relates to the technical field of natural gas production, and comprises a tank body, the top of the tank body is connected with a cover plate, the cover plate is connected with sulfur-loaded activated carbon, the inner wall of the tank body is respectively connected with a pair of first water distribution pipe and second water distribution pipe from top to bottom, one side of the first water distribution pipe is fixedly connected with a triethylene glycol barren solution conveying pipe, the bottom of the first water distribution pipe is annularly connected with a plurality of first spray heads, one side of the second water distribution pipe is connected with a natural gas conveying pipe, and the top of the natural gas conveying pipe is annularly connected with a plurality of second spray heads; raw material natural gas enters from the bottom of the tank body through the natural gas conveying pipe and is in countercurrent contact with triethylene glycol barren liquor entering from the triethylene glycol barren liquor conveying pipe in the tank body, and the dehydrated natural gas enters the sulfur-loaded activated carbon, so that the sulfur-loaded activated carbon fully removes mercury from the natural gas, and mercury is conveniently collected and treated.

Description

Technical Field

[0001] This utility model relates to the field of natural gas production technology, and in particular to a novel natural gas liquefaction dehydration and mercury removal device. Background Technology

[0002] Liquefied natural gas (LNG) is a colorless, odorless, non-toxic, and non-corrosive liquid. However, impurities such as water and mercury in LNG can cause severe corrosion and blockages in liquefaction equipment and pipelines. Water freezes below zero degrees Celsius, forming hydrates that clog pipelines and equipment. Mercury, on the other hand, becomes liquid at low temperatures, corroding equipment and potentially poisoning precious metal catalysts. To prevent these impurities from corroding equipment and freezing at low temperatures to block equipment and pipelines, dehydration and mercury removal treatments are necessary during the natural gas liquefaction process.

[0003] A Chinese patent discloses a natural gas liquefaction dehydration and mercury removal device (publication number CN217499173U). This patented technology heats the liquefied natural gas to the temperature at which mercury vaporizes by activating a heating device inside the mercury removal tank. This ensures that the mercury gas inside the mercury removal tank quickly enters the first conveyor frame and is discharged through the exhaust channel. However, heating the mercury causes it to evaporate and form mercury vapor. This vapor is toxic to the human body and can easily cause harm to workers if inhaled. Therefore, the method of heating mercury poses a safety hazard. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a novel natural gas liquefaction dehydration and mercury removal device, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A novel natural gas liquefaction dehydration and mercury removal device includes a tank body. Four second fixing plates are circumferentially connected to the top of the outer side of the tank body. An electric push rod is connected to the top of the second fixing plate. A first fixing plate is connected to the top of the electric push rod. A cover plate is connected to the inner side of the first fixing plate. A filter screen is connected inside the cover plate. Four third fixing rods are circumferentially connected to the bottom of the cover plate. A support frame is sleeved on the outer side of the third fixing rod. A fixing mechanism is provided at the bottom of the third fixing rod. An outer shell is connected to the top of the support frame. Sulfur-loaded activated carbon is connected inside the outer shell.

[0006] The inner wall of the tank is connected from top to bottom to a pair of first water distribution pipes and a second water distribution pipe. A triethylene glycol lean solution delivery pipe is fixedly connected to one side of the first water distribution pipe. One end of the triethylene glycol lean solution delivery pipe penetrates the interior of the tank. Several first nozzles are circumferentially connected to the bottom of the first water distribution pipe. A natural gas delivery pipe is connected to one side of the second water distribution pipe. One side of the natural gas delivery pipe penetrates the interior of the tank. Several second nozzles are circumferentially connected to the top of the natural gas delivery pipe. A discharge pipe is connected to the end of the tank.

[0007] As a further technical solution of this utility model, a plurality of first nozzles and a plurality of second nozzles are arranged in an alternating pattern.

[0008] As a further technical solution of this utility model, five first fixing rods are circumferentially connected to the outer side of the first water distribution pipe, and one end of the first fixing rod is fixedly connected to the side wall of the tank.

[0009] As a further technical solution of this utility model, five second fixing rods are circumferentially connected to the outer side of the second water distribution pipe, and one end of the second fixing rod is fixedly connected to the side wall of the tank.

[0010] As a further technical solution of this utility model, the fixing mechanism includes a screw rod, and the end of the third fixing rod is provided with a screw hole, and the screw rod is threadedly connected to the screw hole.

[0011] As a further technical solution of this utility model, the support frame has four through holes connected in a circumferential direction inside, and the third fixing rod passes through the inside of the through holes.

[0012] This utility model provides a novel natural gas liquefaction dehydration and mercury removal device, which has the following advantages compared with the prior art:

[0013] This design presents a novel natural gas liquefaction dehydration and mercury removal device. Raw natural gas enters from the bottom of the tank via a natural gas delivery pipe, where it comes into countercurrent contact with triethylene glycol (TG) lean solution entering from a TG lean solution delivery pipe. Utilizing the poor immiscibility of TG lean solution with natural gas and its miscibility with water, the TG lean solution absorbs moisture from the natural gas, thus achieving the purpose of drying the natural gas. The dehydrated natural gas then enters sulfur-loaded activated carbon, where the activated carbon thoroughly removes mercury from the natural gas and facilitates mercury collection and treatment. This avoids the occurrence of mercury vapor due to heating the mercury, improving the safety of natural gas use and ensuring safe production in natural gas operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a novel natural gas liquefaction dehydration and mercury removal device;

[0015] Figure 2This is a side sectional view of the tank in a novel natural gas liquefaction dehydration and mercury removal device;

[0016] Figure 3 A schematic diagram of the connection structure at the bottom of the cover plate in a novel natural gas liquefaction dehydration and mercury removal device;

[0017] Figure 4 An exploded view of the cover plate, outer shell, and support frame in a novel natural gas liquefaction dehydration and mercury removal device;

[0018] Figure 5 This is a bottom view of the fixed rod and screw in a novel natural gas liquefaction dehydration and mercury removal device.

[0019] In the diagram: 1. Cover plate; 2. First fixing plate; 3. Electric push rod; 4. Second fixing plate; 5. Tank body; 6. Triethylene glycol lean liquor delivery pipe; 7. Filter screen; 8. Natural gas delivery pipe; 9. Discharge pipe; 10. First water distribution pipe; 11. First nozzle; 12. Second nozzle; 13. Second water distribution pipe; 14. First fixing rod; 15. Second fixing rod; 16. Outer shell; 17. Support frame; 18. Sulfur-loaded activated carbon; 19. Third fixing rod; 20. Screw; 21. Through hole; 22. Screw hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 5 This utility model provides a novel technical solution for a natural gas liquefaction dehydration and mercury removal device: it includes a tank body 5, four second fixing plates 4 are circumferentially connected to the top of the tank body 5, an electric push rod 3 is connected to the top of the second fixing plate 4, a first fixing plate 2 is connected to the top of the electric push rod 3, a cover plate 1 is connected to the inner side of the first fixing plate 2, a filter screen 7 is connected inside the cover plate 1, four third fixing rods 19 are circumferentially connected to the bottom of the cover plate 1, a support frame 17 is sleeved on the outer side of the third fixing rod 19, a fixing mechanism is provided at the bottom of the third fixing rod 19, an outer shell 16 is connected to the top of the support frame 17, and sulfur-loaded activated carbon 18 is connected inside the outer shell 16. The dehydrated natural gas enters the sulfur-loaded activated carbon 18, so that the sulfur-loaded activated carbon 18 can fully remove mercury from the natural gas and facilitate the collection and treatment of mercury. The electric push rod 3 is turned on to lift the cover plate 1, thereby facilitating the operation of removing and replacing the sulfur-loaded activated carbon 18.

[0022] A pair of first water distribution pipes 10 and second water distribution pipes 13 are connected from top to bottom to the inner wall of the tank body 5. A triethylene glycol lean liquid conveying pipe 6 is fixedly connected to one side of the first water distribution pipe 10. One end of the triethylene glycol lean liquid conveying pipe 6 penetrates the interior of the tank body 5. Several first nozzles 11 are circumferentially connected to the bottom of the first water distribution pipe 10. A natural gas conveying pipe 8 is connected to one side of the second water distribution pipe 13. One side of the natural gas conveying pipe 8 penetrates the interior of the tank body 5. Several second nozzles 12 are circumferentially connected to the top of the natural gas conveying pipe 8. A discharge pipe 9 is connected to the end of the tank body 5. The raw material natural gas enters from the bottom of the tank body 5 through the natural gas conveying pipe 8 and comes into countercurrent contact with the triethylene glycol lean liquid entering from the triethylene glycol lean liquid conveying pipe 6 in the tank body 5. The dehydrated natural gas leaves from the top of the sulfur-loaded activated carbon 18, and the triethylene glycol rich liquid is discharged from the discharge pipe 9.

[0023] like Figure 2 As shown, several first nozzles 11 and several second nozzles 12 are staggered. Raw material natural gas is sprayed upward through the natural gas transmission pipe 8 and the second nozzles 12, while triethylene glycol lean liquid entering through the triethylene glycol lean liquid transmission pipe 6 is sprayed downward through the first nozzles 11. By setting the first nozzles 11 and the second nozzles 12 to be staggered, it is beneficial to make the natural gas and the triethylene glycol lean liquid components come into contact and react.

[0024] like Figure 2 As shown, five first fixing rods 14 are circumferentially connected to the outer side of the first water distribution pipe 10. One end of the first fixing rod 14 is fixedly connected to the side wall of the tank body 5 to facilitate the fixing of the first water distribution pipe 10. Five second fixing rods 15 are circumferentially connected to the outer side of the second water distribution pipe 13. One end of the second fixing rod 15 is fixedly connected to the side wall of the tank body 5 to facilitate the fixing of the second water distribution pipe 13.

[0025] like Figure 5 As shown, the fixing mechanism includes a screw 20, and a screw hole 22 is provided at the end of the third fixing rod 19. The screw 20 is threadedly connected to the screw hole 22. Rotating the screw 20 separates the screw 20 from the screw hole 22. After removing the screw 20, it is convenient to remove the support frame 17 from the third fixing rod 19, and then convenient to remove the sulfur-loaded activated carbon 18 for replacement.

[0026] like Figure 4 As shown, the support frame 17 has four through holes 21 connected in a circumferential direction inside. The third fixing rod 19 passes through the inside of the through holes 21. After the screw 20 is removed, it is convenient to remove the support frame 17 from the third fixing rod 19.

[0027] The working principle of this utility model is as follows: the raw material natural gas enters from the bottom of the tank 5 through the natural gas transmission pipe 8, and comes into countercurrent contact with the triethylene glycol lean liquid entering from the triethylene glycol lean liquid transmission pipe 6 in the tank 5. Utilizing the characteristics of triethylene glycol lean liquid being poorly miscible with natural gas but miscible with water, it can absorb the moisture in the natural gas, thereby achieving the purpose of drying the natural gas. The dehydrated natural gas enters the sulfur-loaded activated carbon 18, which allows the sulfur-loaded activated carbon 18 to fully remove mercury from the natural gas and facilitates the collection and treatment of mercury. This avoids the situation of mercury vapor being generated due to heating mercury, improves the safety of natural gas use, and ensures safe production in natural gas operations.

[0028] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A novel natural gas liquefaction dehydration and mercury removal device, characterized in that, include: The tank (5) has four second fixing plates (4) circumferentially connected to the top of the outer side of the tank (5). The top of the second fixing plate (4) is connected to an electric push rod (3). The top of the electric push rod (3) is connected to a first fixing plate (2). The inner side of the first fixing plate (2) is connected to a cover plate (1). The inside of the cover plate (1) is connected to a filter screen (7). The bottom of the cover plate (1) is connected to four third fixing rods (19) circumferentially connected to the bottom. The outer side of the third fixing rod (19) is fitted with a support frame (17). The bottom of the third fixing rod (19) is provided with a fixing mechanism. The top of the support frame (17) is connected to a shell (16). The inside of the shell (16) is connected to sulfur-loaded activated carbon (18). The inner wall of the tank (5) is connected from top to bottom to a pair of first water distribution pipes (10) and second water distribution pipes (13). A triethylene glycol lean liquid delivery pipe (6) is fixedly connected to one side of the first water distribution pipe (10). One end of the triethylene glycol lean liquid delivery pipe (6) penetrates the interior of the tank (5). Several first nozzles (11) are circumferentially connected to the bottom of the first water distribution pipe (10). A natural gas delivery pipe (8) is connected to one side of the second water distribution pipe (13). One side of the natural gas delivery pipe (8) penetrates the interior of the tank (5). Several second nozzles (12) are circumferentially connected to the top of the natural gas delivery pipe (8). A discharge pipe (9) is connected to the end of the tank (5).

2. The novel natural gas liquefaction dehydration and mercury removal device according to claim 1, characterized in that, Several first nozzles (11) and several second nozzles (12) are staggered.

3. The novel natural gas liquefaction dehydration and mercury removal device according to claim 1, characterized in that, Five first fixing rods (14) are circumferentially connected to the outer side of the first water distribution pipe (10), and one end of the first fixing rod (14) is fixedly connected to the side wall of the tank (5).

4. A novel natural gas liquefaction dehydration and mercury removal device according to claim 1, characterized in that, Five second fixing rods (15) are circumferentially connected to the outer side of the second water distribution pipe (13), and one end of the second fixing rod (15) is fixedly connected to the side wall of the tank (5).

5. A novel natural gas liquefaction dehydration and mercury removal device according to claim 1, characterized in that, The fixing mechanism includes a screw (20), and the end of the third fixing rod (19) is provided with a screw hole (22), and the screw (20) is threadedly connected to the screw hole (22).

6. A novel natural gas liquefaction dehydration and mercury removal device according to claim 1, characterized in that, The support frame (17) has four through holes (21) connected in a circumferential direction inside, and the third fixing rod (19) passes through the inside of the through holes (21).

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