Dehydration device for produced gas of gas storage

Abstract

The utility model relates to the related technical field of gas storages, and particularly discloses a gas storage produced gas dehydration device which comprises a pre-separation tank body and a dehydration tank body, an upper interlayer, a middle interlayer and a lower interlayer are respectively arranged in the dehydration tank body from top to bottom, and the upper interlayer is communicated with the middle interlayer at one end far away from the pre-separation tank body. A liquid distributor is arranged at the upper part of the upper interlayer; a plurality of groups of water vapor trapping modules which are arranged at equal intervals up and down are arranged in the middle interlayer, each water vapor trapping module is formed by sequentially splicing and assembling a plurality of V-shaped water vapor trapping units, each water vapor trapping unit is composed of a metal frame located on the outer side and plastic woven mesh cloth located on the inner side, and a plurality of groups of U-shaped pipes are further arranged in the middle interlayer. According to the utility model, the trapping module for trapping tiny liquid drops is additionally arranged, escaped water vapor is greatly reduced in a mode that a formed large-area barren liquor film is in contact with gas so as to be separated from water, and the water removal rate of the produced gas of the gas storage is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gas storage facilities, specifically a gas dehydration device for produced gas from a gas storage facility. Background Technology

[0002] Produced gas from underground gas storage facilities typically contains a high content of saturated water, as well as small amounts of condensate oil and other impurities. Before being sent into gathering and transmission pipelines, the moisture content must be reduced to standard levels for liquefaction and transportation. Triethylene glycol (TG) separators are commonly used for dehydration of produced natural gas. Lean TG solution is sprayed at the top of the tower, and natural gas enters from the bottom, contacting the lean solution counter-currently and trapping the moisture in the natural gas.

[0003] Because triethylene glycol is a relatively viscous liquid, and natural gas dehydration lowers the water dew point to more than 5°C below the ambient temperature, triethylene glycol has relatively poor fluidity and does not easily form small droplets. When it comes into contact with water, much of the high-speed flowing gaseous water escapes, and even mist eliminators cannot completely capture it, causing water to escape into the pipeline. Some equipment improves the dehydration rate by increasing the internal stroke of the tower and setting up multi-stage dehydration units to enhance the two-phase contact efficiency. This directly leads to the drawback of many current tower structures being very tall and large in volume. Utility Model Content

[0004] The purpose of this invention is to provide a gas dehydration device for gas produced from a gas storage facility, in order to solve the problems of water vapor escape and excessive tower height in existing triethylene glycol dehydration towers mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A gas dehydration device for gas produced from a gas storage facility includes: a pre-separation tank and a dehydration tank, wherein the pre-separation tank and the dehydration tank are integrally formed, and an air inlet is provided on the pre-separation tank;

[0007] The dehydration tank is provided with an upper jacket, a middle jacket, and a lower jacket from top to bottom. The upper jacket and the middle jacket are connected at the end away from the pre-separation tank. A lean liquid pipeline is provided on the outside of the upper jacket of the dehydration tank. A liquid distributor connected to the lean liquid pipeline is provided at the upper part of the upper jacket. The middle jacket is provided with multiple sets of water vapor capture modules arranged vertically and vertically at equal intervals. The water vapor capture module is formed by assembling multiple "V"-shaped water vapor capture units in sequence. The water vapor capture unit consists of a metal frame on the outside and a plastic woven mesh on the inside. The plastic woven mesh is fixed inside the metal frame, and the metal frame is fixed inside the tank. The middle jacket is also provided with multiple sets of U-shaped tubes. One end of each U-shaped tube is connected to the lean liquid pipeline. The straight section of the U-shaped tube is parallel to the top edge of the water vapor capture unit and located directly above it. A strip-shaped liquid outlet channel is provided on the straight section.

[0008] As a further embodiment of this utility model: the dehydration tank body is provided with confluence channels at the upper and lower ends, respectively connecting the bottom of the upper interlayer and the lower interlayer.

[0009] As a further embodiment of this utility model: the bottom edge of the multiple sets of water vapor capture units located at the top is provided with a confluence channel, and the bottom edge of the water vapor capture unit located at the bottom is connected to the confluence channel.

[0010] As a further embodiment of this utility model: a mist eliminator is also provided in the middle interlayer, the mist eliminator is located between the water vapor capture module and the pre-separation tank, and the mist eliminator is connected to the air outlet.

[0011] As a further embodiment of this utility model: a spiral flow channel is provided inside the pre-separation tank, the inlet of the spiral flow channel is connected to the air inlet, and the outlet of the spiral flow channel is connected to the upper interlayer.

[0012] As a further embodiment of this utility model, a liquid storage chamber is provided at the bottom of the pre-separation tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts a horizontal tank form, with a layered design inside the tank to increase the gas flow, and a pre-separation section is set to pre-separate larger water droplets and impurities such as condensate oil to reduce the pressure of subsequent dehydration.

[0014] 2. This utility model adds a collection module for capturing tiny droplets to the existing method of dehydrating triethylene glycol by spraying liquid. By forming a large-area lean liquid film that comes into contact with the gas and removes moisture, the escape of water vapor is greatly reduced, and the dehydration rate of the gas produced from the gas storage is further improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the water vapor capture unit in this utility model.

[0018] In the diagram, 1. Pre-separation tank; 11. Air inlet; 12. Spiral flow channel; 13. Liquid storage chamber; 2. Dehydration tank; 21. Air outlet; 22. Lean liquid pipeline; 23. Upper jacket; 231. Liquid distributor; 24. Lower jacket; 25. Middle jacket; 251. Water vapor capture module; 2511. Metal frame; 2512. Plastic woven mesh; 2513. Manifold orifice; 252. U-shaped pipe; 253. Manifold channel; 254. Mist eliminator. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 , 2 In this embodiment of the present invention, a gas dehydration device for a gas storage facility includes: a pre-separation tank 1 and a dehydration tank 2. The pre-separation tank 1 and the dehydration tank 2 are integrally formed. The pre-separation tank 1 is provided with an air inlet 11 for natural gas production gas intake. A spiral flow channel 12 is provided inside the pre-separation tank 1. The inlet of the spiral flow channel 12 is connected to the air inlet 11. A storage chamber 13 for temporary storage of separation liquid is provided at the bottom of the pre-separation tank 1. Natural gas carrying water droplets, condensate oil, silt and other impurities flows through the spiral flow channel 12 and undergoes centrifugal separation. After the water droplets and other impurities are intercepted, they flow into the storage chamber 13 through a through hole opened between the outlet of the spiral flow channel 12 and the storage chamber 13. Sewage can be discharged periodically.

[0021] The dehydration tank 2 is provided with an upper jacket 23, a middle jacket 25, and a lower jacket 24 from top to bottom. Each jacket is separated by a partition. The upper jacket 23 and the middle jacket 25 are connected at the end furthest from the pre-separation tank 1. A lean liquid pipeline 22 is provided on the dehydration tank 2 outside the upper jacket 23. A distributor 231 connected to the lean liquid pipeline 22 is provided on the upper part of the upper jacket 23. The liquid outlets of the distributor 231 are distributed along the axial direction of the dehydration tank 2, and multiple outlets can also be arranged radially to form a denser liquid column. The end of the upper jacket 23 closest to the pre-separation tank 1 is connected to the outlet of the spiral flow channel 12. The lean liquid pipeline 22 introduces triethylene glycol from the triethylene glycol regeneration tank. The pretreated natural gas enters the upper jacket 23 and contacts the liquid column formed by the distributor 231. Free water in the natural gas is dissolved and retained by the triethylene glycol lean solution. A confluence channel 253 is provided on the wall of the dehydration tank 2, with its upper and lower ends connected to the bottom of the upper jacket 23 and the lower jacket 24, respectively. The confluence channel 253 is used to collect the formed rich solution (triethylene glycol that has absorbed water; the triethylene glycol lean solution has not absorbed water) into the lower jacket 24 for temporary storage. The middle jacket 25 is equipped with multiple sets of water vapor capture modules 251 arranged equidistantly. Each water vapor capture module 251 is formed by sequentially assembling multiple "V"-shaped water vapor capture units. Figure 3The water vapor capture unit consists of an outer metal frame 2511 and an inner plastic woven mesh 2512. The plastic woven mesh 2512 is fixed inside the metal frame 2511 and is fixed and supported by the metal frame 2511. The metal frame 2511 is fixed inside the tank by a bracket. Multiple sets of U-shaped tubes 252 are also installed in the middle jacket 25. One end of each U-shaped tube 252 is connected to the lean liquid pipeline 22. The straight section of the U-shaped tube 252 is parallel to and directly above the top edge of the water vapor capture unit. A strip-shaped outlet channel is provided on the straight section, allowing the triethylene glycol lean liquid introduced by the lean liquid pipeline 22 to enter the U-shaped tube. Inside 252, the liquid exiting from the liquid outlet channel is sprayed onto the top edge of the water vapor capture unit, flows to both sides and spreads on the upper surface of the plastic woven mesh 2512. Due to the water-permeable nature of the plastic woven mesh 2512, the lean liquid usually permeates to the lower surface of the mesh. In addition, due to the viscous properties of triethylene glycol, a liquid film covered by lean liquid can be formed on the upper and lower surfaces of the water vapor capture unit. The bottom edges of the multiple sets of water vapor capture units located above are provided with confluence flow holes 2513 to allow the liquid to flow down through them. The bottom edge of the water vapor capture unit located at the bottom is connected to the confluence channel 253 and flows into the lower interlayer 24 together with the rich liquid generated by the upper interlayer 23.

[0022] Because the gas produced from the gas storage facility has high pressure and high flow rate, some free water remains after dehydration in the upper interlayer 23 and is not captured by the lean liquid. It then enters the middle interlayer 25 with the natural gas. The natural gas is diverted by multiple water vapor capture modules 251 and enters between the modules. The gas impacts the liquid film on the modules and gradually captures the free water during the contact process, thereby greatly reducing the water content of the natural gas at the outlet.

[0023] A mist eliminator 254 is also provided in the middle interlayer 25. The mist eliminator 254 is located between the water vapor capture module 251 and the pre-separation tank 1 and is used to demist the gas at the outlet. The mist eliminator 254 is connected to the gas outlet 21.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas dehydrator for gas produced from a gas reservoir, comprising: The pre-separation tank body (1) and the dehydration tank body (2) are integrally formed, and the pre-separation tank body (1) is provided with an air inlet (11); The dehydration tank body (2) is provided with an upper interlayer (23), a middle interlayer (25) and a lower interlayer (24) from top to bottom, the upper interlayer (23) and the middle interlayer (25) are connected at one end away from the pre-separation tank body (1), a lean liquid pipeline (22) is arranged on the upper interlayer (23) outside the dehydration tank body (2), and a liquid distributor (231) connected with the lean liquid pipeline (22) is arranged at the upper portion of the upper interlayer (23); a plurality of water vapor capture modules (251) arranged equidistantly in upper and lower directions are arranged in the middle interlayer (25), the water vapor capture module (251) is formed by a plurality of "V"-shaped water vapor capture units connected in sequence, the water vapor capture unit is composed of a metal frame (2511) on the outside and a plastic woven mesh (2512) on the inside, the plastic woven mesh (2512) is fixed on the inside of the metal frame (2511), and the metal frame (2511) is fixed in the tank; a plurality of U-shaped pipes (252) are arranged in the middle interlayer (25), one end of the U-shaped pipe (252) is connected with the lean liquid pipeline (22), the straight pipe section of the U-shaped pipe (252) is parallel to the top edge of the water vapor capture unit and located directly above the top edge, and a strip-shaped liquid outlet channel is arranged on the straight pipe section.

2. The gas dehydration unit for depleted gas from a gas storage according to claim 1, characterized in that: The dehydration tank body (2) is provided with a flow collection channel (253) connected with the bottom of the upper interlayer (23) and the inside of the lower interlayer (24) on the tank wall.

3. A gas dehydration unit for produced gas from a gas storage according to claim 2, characterized in that: The bottom edges of the water vapor capture units arranged in multiple groups at the upper portion are provided with flow collection through holes (2513), and the bottom edge of the water vapor capture unit arranged at the lowermost portion is connected to the flow collection channel (253).

4. The gas dehydration unit for depleted gas from a gas storage according to claim 1, characterized in that: The middle interlayer (25) is further provided with a mist catcher (254), the mist catcher (254) is located between the water vapor capture module (251) and the pre-separation tank body (1), and the mist catcher (254) is connected to the air outlet (21).

5. The gas dehydration unit for depleted gas from a gas storage according to claim 1, characterized in that: The pre-separation tank body (1) is provided with a spiral flow channel (12), the inlet of the spiral flow channel (12) is connected with the air inlet (11), and the outlet of the spiral flow channel (12) is connected with the upper interlayer (23).

6. A gas dehydration unit for produced gas from a gas storage according to claim 5, characterized in that: The pre-separation tank body (1) is provided with a liquid storage cavity (13) at the bottom.

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