Dehydration tank group for natural gas purification

Abstract

The utility model discloses a dehydration tank group for natural gas purification, which comprises a decompression tank and a drying tank, the decompression tank is communicated with the drying tank through a communicating pipe, the top of the decompression tank is provided with an air inlet, the bottom of the decompression tank is provided with a drain valve, throttling orifice plates are uniformly arranged in the decompression tank from top to bottom in sequence, the drying tank is provided with an exhaust port, and the exhaust port is communicated with the decompression tank. The drying tank is provided with a drying agent layer and a regeneration unit, and the regeneration unit is used for regenerating the drying agent layer; according to the dehydration tank group for purifying the natural gas, the decompression tank is adopted, so that the natural gas can be subjected to throttling, decompression and dehydration in advance, a large amount of water is separated out and discharged before entering a drying agent, the water is prevented from being quickly accumulated in the drying tank, and the regeneration frequency of the drying agent is reduced; a drying agent in the drying agent layer can be periodically regenerated, and the drying agent does not need to be replaced after long-time shutdown.

Description

Technical Field

[0001] This utility model relates to natural gas dehydration technology, specifically a dehydration tank assembly for natural gas purification. Background Technology

[0002] Natural gas flowing from the wellhead is almost entirely saturated with gaseous water, and may even carry a certain amount of liquid water. The presence of moisture in natural gas often has serious consequences. For example, natural gas containing CO2 and H2S can form acids in the presence of water, corroding pipelines and equipment; under certain conditions, it can form natural gas hydrates, clogging valves, pipelines, and equipment; and it can reduce pipeline transport capacity, causing unnecessary power consumption. The presence of moisture in natural gas is highly detrimental; therefore, natural gas dehydration is essential.

[0003] Conventional natural gas dehydration equipment mainly uses solid adsorption. However, solid adsorption generally relies on desiccants inside the tank for adsorption. When drying natural gas with excessively high water vapor content, the desiccant quickly adsorbs a large amount of water, requiring frequent replacement of the desiccant. Replacing the desiccant requires long-term shutdown, which affects the dehydration efficiency. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a dehydration tank unit for natural gas purification, which can pre-throttle and depressurize natural gas before drying it with a desiccant. The desiccant can be regenerated periodically, eliminating the need for long-term shutdowns to replace it. Furthermore, it allows a large amount of moisture to be released and discharged before entering the desiccant, preventing the desiccant from absorbing water quickly and reducing the number of desiccant regeneration cycles.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a dehydration tank assembly for natural gas purification, comprising a pressure reducing tank and a drying tank, wherein the pressure reducing tank is connected to the drying tank via a connecting pipe, the pressure reducing tank is provided with an air inlet at the top and a drain valve at the bottom, and a throttling orifice plate is uniformly arranged from top to bottom inside the pressure reducing tank, the drying tank is provided with an exhaust port, and the drying tank is provided with a desiccant layer and a regeneration unit, wherein the regeneration unit is used to regenerate the desiccant layer.

[0006] Preferably, the drying tank is provided with a pressurizing unit, which includes a pressurizing motor and a fan blade. The pressurizing motor is fixed to the outer wall of the drying tank, and the output shaft of the pressurizing motor extends into the drying tank and is coaxial with the fan blade.

[0007] Preferably, the regeneration unit includes a regeneration gas inlet and a heating plate. The regeneration gas inlet is located on the side of the drying tank opposite to the exhaust port, and the heating plate is located between the regeneration gas inlet and the desiccant layer.

[0008] Preferably, a gas distribution plate is provided between the regenerated gas inlet and the heating plate.

[0009] Preferably, filter plates are provided on both sides of the desiccant layer.

[0010] Preferably, the outer wall of the pressure reducing tank is provided with a jacket, the jacket is provided with a cooling chamber, and the jacket is provided with a liquid inlet and a liquid outlet on both sides, and the liquid inlet and the liquid outlet are both connected to the cooling chamber.

[0011] In summary, this utility model achieves the following technical effects:

[0012] The natural gas purification dehydration tank unit of this utility model adopts a pressure reducing tank, which can pre-dehydrate the natural gas by throttling and reducing pressure, so that a large amount of water is separated and discharged before entering the desiccant, avoiding the rapid accumulation of water in the drying tank, reducing the number of desiccant regeneration times, and with the help of the regeneration unit, the desiccant in the desiccant layer can be regenerated regularly without the need for long-term shutdown to replace the desiccant. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the dehydration tank assembly for natural gas purification according to this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the pressure-reducing tank of the natural gas purification dehydration tank group of this utility model;

[0015] Figure 3 This is a schematic diagram of the internal structure of the drying tank of the natural gas purification dehydration tank group of this utility model;

[0016] Explanation of the reference numerals in the accompanying drawings: 1. Pressure reducing tank; 2. Drying tank; 3. Air inlet; 4. Connecting pipe; 5. Exhaust port; 6. Drain valve; 7. Pressurizing motor; 8. Fan blade; 9. Throttling orifice plate; 10. Gas distribution plate; 11. Heating plate; 12. Desiccant layer; 13. Filter plate; 14. Regeneration gas inlet; 15. Jacket. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Example 1:

[0024] like Figure 1As shown in Figure 2, a dehydration tank assembly for natural gas purification includes a pressure reducing tank 1 and a drying tank 2. The pressure reducing tank 1 is connected to the drying tank 2 via a connecting pipe 4. The pressure reducing tank 1 has an air inlet 3 at its top and a drain valve 6 at its bottom. Throttling orifice plates 9 are evenly arranged from top to bottom inside the pressure reducing tank 1. The drying tank 2 has an exhaust port 5. The drying tank 2 has a desiccant layer 12 and a regeneration unit. The regeneration unit is used to regenerate the desiccant layer 12.

[0025] The connecting pipe 4 is equipped with a stop valve, also known as a gate valve. It is a forced sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage.

[0026] The orifice plate 9 can throttle and reduce the pressure of gas. According to the Joule-Thomson effect, the temperature of natural gas will also decrease accordingly during the depressurization process. If the water content in the natural gas is high and the dew point is above the temperature after throttling, water will be precipitated after throttling, thus achieving the purpose of dehydration. The pressurization unit is mainly set to increase the flow rate of natural gas, thereby increasing the throttling and pressure reduction range of the orifice plate 9, thereby improving the water precipitation effect.

[0027] The natural gas purification dehydration tank group in this embodiment uses a pressure reducing tank 1, which can pre-dehydrate the natural gas by throttling and reducing pressure, so that a large amount of water is precipitated before entering the desiccant and the precipitated water is discharged by periodically opening the drain valve 6, avoiding the rapid accumulation of water in the drying tank 2, reducing the number of desiccant regenerations, and in conjunction with the regeneration unit, the desiccant in the desiccant layer 12 can be regenerated periodically without the need for long-term shutdown to replace the desiccant.

[0028] like Figure 3 As shown, the drying tank 2 is equipped with a pressurizing unit, which includes a pressurizing motor 7 and a fan blade 8. The pressurizing motor 7 is fixed to the drying tank 2, and the output shaft of the pressurizing motor 7 extends into the drying tank 2 and is coaxially arranged with the fan blade 8. Since the pressure reducing tank 1 throttles and reduces the pressure of the gas, the gas pressure entering the drying tank 2 is relatively low, and the drying efficiency of the desiccant layer 12 in the drying tank 2 will be poor. By adding a pressurizing unit, the gas pressure can be effectively increased, the drying efficiency can be improved, and the regeneration gas can also be pressurized to improve the regeneration efficiency.

[0029] The regeneration unit includes a regeneration gas inlet 14 and a heating plate 11. The regeneration gas inlet 14 is located on the side of the drying tank 2 opposite to the exhaust port 5. The heating plate 11 is located between the regeneration gas inlet 14 and the desiccant layer 12. A gas distribution plate 10 is provided between the regeneration gas inlet 14 and the heating plate 11. Filter plates 13 are provided on both sides of the desiccant layer 12. The gas distribution plate 10 is used to evenly distribute the clean air or nitrogen introduced through the regeneration gas inlet 14, so that the airflow can pass evenly through the heating plate 11 and be heated before passing through the desiccant layer 12, so that the desiccant layer 12 is evenly heated, thereby improving the regeneration effect.

[0030] The desiccant layer 12 uses activated alumina filler. Activated alumina, also known as activated bauxite, is a porous, highly dispersed solid material with a large surface area. Its microporous surface possesses the characteristics required for catalytic activity, such as adsorption performance, surface activity, and excellent thermal stability. Therefore, it is widely used as a catalyst and catalyst carrier in chemical reactions. The spherical activated alumina pressure swing oil adsorbent consists of white, spherical, porous particles. The activated alumina particles are uniform in size, have a smooth surface, high mechanical strength, and strong hygroscopicity. After absorbing water, it does not swell or crack, maintaining its original shape. It is non-toxic, odorless, and insoluble in water and ethanol. Activated alumina is a highly efficient desiccant for deep drying of trace amounts of water; after heating to 180–350℃, the adsorbed moisture can be removed by rinsing with clean air or nitrogen, achieving regeneration.

[0031] The outer wall of the pressure reducing tank is provided with a jacket, and a cooling chamber is provided inside the jacket. An inlet and a outlet are respectively provided on both sides of the jacket, and the inlet and outlet are connected to the cooling chamber. The inlet and outlet are connected to the cooling system. Since the natural gas has been pre-pressurized by the air compressor before entering the pressure reducing tank 1, and the temperature of the gas will rise sharply after pressurization, the jacket 15 is added. In conjunction with the cooling system, the cooling liquid in the cooling chamber is circulated to achieve rapid heat dissipation and avoid the temperature of the pressure reducing tank 1 from becoming too high.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A dehydration tank group for natural gas purification, characterized by comprising: The device comprises a decompression tank and a drying tank, the decompression tank is communicated with the drying tank through a communication pipe, the top of the decompression tank is provided with an air inlet, the bottom of the decompression tank is provided with a drain valve, the decompression tank is uniformly provided with throttle orifice plates from top to bottom, the drying tank is provided with an exhaust port, the drying tank is provided with a desiccant layer and a regeneration unit, and the regeneration unit is used for regenerating the desiccant layer.

2. The dehydrating tank group for natural gas purification according to claim 1, wherein The drying tank is provided with a pressurizing unit, the pressurizing unit comprises a pressurizing motor and a fan blade, the pressurizing motor is fixed to the outer wall of the drying tank, the output shaft of the pressurizing motor extends into the drying tank and is coaxially arranged with the fan blade.

3. The dehydrating vessel set for natural gas purification according to claim 1, wherein The regeneration unit comprises a regeneration gas input port and a heating plate, the regeneration gas input port is arranged on the side of the drying tank relative to the exhaust port, and the heating plate is arranged between the regeneration gas input port and the desiccant layer.

4. The dehydrating vessel set for natural gas purification according to claim 3, wherein A gas distribution plate is arranged between the regeneration gas input port and the heating plate.

5. The dehydrating vessel set for natural gas purification according to claim 1, wherein Filter plates are arranged on both sides of the desiccant layer.

6. The dehydrating vessel set for natural gas purification according to claim 1, wherein The outer wall of the decompression tank is provided with a jacket, the jacket is provided with a cooling cavity, and the jacket is provided with a liquid inlet and a liquid outlet on both sides, respectively. The liquid inlet and the liquid outlet are communicated with the cooling cavity.

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