A tertiary oil and gas recovery apparatus

Abstract

The utility model relates to oil and gas recovery technical field especially is concerned about a kind of three times oil and gas recovery equipment;Specifically provide a kind of adsorption tank structure, by shunt cone, inlet oil gas is divided into two ways: radial flow through first flow hole and is sprayed into isolation chamber, buffer pressure equalization is penetrated after cavity top multi-aperture plate, axial flow is directly penetrated multi-aperture plate from the open of cone and enters adsorbent bed, double flow is converged at adsorbent bed bottom, and vertical rising airflow is formed by the whole domain micropore flow of multi-aperture plate, and its small aperture design weakens impact force;The structure is processed by two paths to eliminate channeling effect, realizes adsorbent whole domain high efficiency utilization, significantly improves recovery efficiency and service life.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas recovery technology, and in particular to a tertiary oil and gas recovery device. Background Technology

[0002] Tertiary oil and gas recovery equipment is a key component in the control of oil and gas pollution at gas stations, belonging to end-of-pipe oil and gas treatment devices. Its core function is to efficiently capture and recover high-concentration oil and gas emitted from the vent pipe of the storage tank during the unloading process of oil tankers into underground storage tanks through physical or chemical methods, converting it into liquid gasoline for reuse, while ensuring that the emissions meet environmental protection standards, thereby significantly reducing volatile organic compound emissions and providing environmental, energy-saving, and safety benefits.

[0003] Despite the widespread use of such equipment, existing adsorption tanks employing the adsorption method still have significant drawbacks. When tank trucks rapidly unload oil, a large volume of oil-gas mixture, driven by pressure, rushes into the adsorption tank at high speed through a single inlet pipe at the bottom of the tank, forming a concentrated jet of air that directly impacts the local adsorbent area directly above it. This abrupt entry leads to two major problems: First, the high-speed oil-gas flow creates a channeling effect at the bottom of the adsorption bed, preferentially penetrating the narrow channel directly opposite the inlet, causing the adsorbent in that area to saturate and fail too quickly. Meanwhile, the adsorbent in the surrounding and distant areas remains underloaded due to uneven airflow distribution, essentially becoming idle resources. Second, the channeling causes some oil-gas to pass through the bed without sufficient adsorption, mixing with the purified gas and escaping. The direct consequences are a significant reduction in adsorption efficiency, frequent fluctuations in emission gas concentrations, and even exceeding standards. Simultaneously, due to the rapid failure of the local adsorbent under overload, the overall adsorbent replacement cycle is forced to shorten, leading to a surge in operating and maintenance costs. Furthermore, the compaction of the adsorbent in the localized saturated area can increase airflow resistance, further increasing system energy consumption.

[0004] Therefore, this application provides a tertiary oil and gas recovery device to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to provide a tertiary oil and gas recovery device that solves the problems of uneven airflow distribution in the adsorption bed caused by the simple bottom inlet structure of existing adsorption tanks, resulting in local channeling and low adsorption efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides a three-stage oil and gas recovery device, including a tank, a purified gas outlet connected to the upper part of the tank, an oil and gas inlet flange connected to the bottom of the tank, and an adsorbent bed inside the tank.

[0007] A diversion cone is fixedly connected to the inner side of the bottom of the tank. The small end of the diversion cone points to and connects to the direction of the oil and gas inlet flange, and the large end faces the direction of the adsorbent bed. The cone surface of the diversion cone is closed and has several first flow equalization holes evenly opened. A horizontal perforated plate is set on the edge of the large end of the diversion cone, and the outer edge of the perforated plate is sealed to the inner wall of the tank. The perforated plate covers the open end of the large end of the diversion cone and the annular area between the diversion cone and the inner wall of the tank. Several second flow equalization holes are evenly opened on the perforated plate.

[0008] The outer surface of the diversion cone, the lower surface of the perforated plate, and the bottom of the tank together form an isolation chamber, which is located between the diversion cone and the inner wall of the tank.

[0009] A further improvement of this utility model is that the first flow equalization holes are evenly distributed along the circumferential direction of the flow divider cone surface, and the hole diameter is larger than that of the second flow equalization holes.

[0010] A further improvement of this utility model is that the diameter of the first flow equalization hole is in the range of 10mm-20mm.

[0011] A further improvement of this utility model is that the diameter of the second flow equalization hole is in the range of 2mm-10mm.

[0012] A further improvement of this utility model is that the perforation rate of the perforated plate in the central region of the large end opening of the corresponding diversion cone is higher than the perforation rate of the annular region of the corresponding isolation chamber.

[0013] A further improvement of this utility model is that the perforation rate in the central region of the perforated plate is 35%-40%, and the perforation rate in the annular region is 30%-35%.

[0014] A further improvement of this utility model is that the distance between the large end of the diversion cone and the bottom surface of the tank is 100mm-300mm, and this distance constitutes the height of the isolation chamber.

[0015] A further improvement of this utility model is that the outer edge of the perforated plate is connected to the inner wall of the tank by welding.

[0016] A further improvement of this utility model is that the edge of the large end of the diverter cone is fixedly connected to the inner edge of the perforated plate by welding.

[0017] A further improvement to the technical solution of this utility model is that several vertical support frames are provided at the bottom of the tank.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects:

[0019] 1. The present invention provides a three-stage oil and gas recovery device. The device uses a combination of a diversion cone fixedly connected to the inner side of the bottom and a first radial flow equalization hole on the cone surface to forcibly change the movement trajectory of the high-speed oil and gas flow, so that the inlet oil and gas changes from vertical impact to multi-directional diffusion, actively disperses the initial airflow energy, eliminates the local "channeling" effect caused by the direct impact of oil and gas on the adsorption bed in traditional structures, and solves the problem of unbalanced airflow distribution from the source.

[0020] 2. The present invention provides a three-stage oil and gas recovery device. The device constructs a core structure for fine distribution of oil and gas through the coordinated arrangement of an isolation chamber and a fully covered horizontal perforated plate. The isolation chamber provides sufficient buffer space to accommodate the kinetic energy dissipation and mixing and pressure equalization of the radial jet, while the uniformly distributed second flow equalization holes on the perforated plate act as the final barrier in the path, transforming the airflow into a uniform flow field that is vertically upward and covers the entire cross-section of the adsorbent bed, ensuring that the oil and gas and the adsorbent achieve efficient contact throughout the entire area.

[0021] 3. The present invention provides a three-stage oil and gas recovery device. The device optimizes the airflow distribution by designing a differential porosity between the central region and the annular region of the porous plate: the slightly higher porosity in the central region alleviates the impact pressure in the area directly opposite the inlet, while the slightly lower porosity in the annular region enhances the edge distribution resistance. The two work together to balance the flow rate across the entire cross section, making the adsorbent bed load distribution more balanced and significantly improving the adsorbent utilization rate.

[0022] 4. The present invention provides a three-stage oil and gas recovery device. The device scientifically controls the buffer space volume by limiting the height of the isolation chamber by the distance from the large end of the diversion cone to the bottom of the tank. This height range ensures that the oil and gas can fully complete turbulent mixing and pressure equalization in the chamber, while avoiding ineffective space waste, so that the device can achieve maximum buffering efficiency in a compact layout.

[0023] 5. The present invention provides a three-stage oil and gas recovery device. The device achieves absolute chamber sealing in a purely mechanical manner through a fully welded and sealed connection structure between the diversion cone, the perforated plate and the tank, eliminating the risk of oil and gas short-circuit leakage, ensuring system reliability under zero electrical control conditions, and reducing failure rate and maintenance complexity. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a tertiary oil and gas recovery device;

[0026] Figure 2 for Figure 1 The front view;

[0027] Figure 3 This is a cross-sectional view of a tertiary oil and gas recovery device;

[0028] Figure 4 for Figure 3 The front view;

[0029] Figure 5 This is a schematic diagram of the structure of the flow divider cone and the perforated plate of this utility model;

[0030] Figure 6 This is a path diagram of the oil and gas flow of this utility model.

[0031] Reference numerals: 1. Tank body; 2. Purified gas outlet; 3. Oil and gas inlet flange; 4. Diverting cone; 5. First flow equalization orifice; 6. Perforated plate; 7. Second flow equalization orifice; 8. Isolation chamber; 9. Adsorbent bed; 10. Support frame. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 do not 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The present invention will be further explained below with reference to specific embodiments.

[0036] like Figures 1-6 As shown, this embodiment provides a three-stage oil and gas recovery device, including a tank 1, a purified gas outlet 2 connected to the upper part of the tank 1 for discharging qualified gas, an oil and gas inlet flange 3 connected to the bottom of the tank 1 to receive external high-concentration oil and gas, an adsorbent bed 9 inside the tank 1 to support activated carbon adsorption medium; several vertical support frames 10 are welded to the bottom of the tank 1 to ensure the equipment is installed stably and to provide connection space for the oil and gas inlet flange 3.

[0037] like Figures 3-6 As shown, in this embodiment, a conical diversion cone 4 is fixedly connected to the inner side of the bottom of the tank 1 via a continuous weld. The small end of the diversion cone 4 is precisely aligned with and connected to the central axis of the oil and gas inlet flange 3, allowing the oil and gas to be injected vertically. The large end is flared towards the adsorbent bed 9 to guide the airflow diffusion. This cone eliminates the destructive kinetic energy of directly impacting the adsorbent bed by forcibly changing the direction of the high-speed oil and gas flow. The cone surface of the diversion cone 4 adopts a closed steel plate structure and has several first flow equalization holes 5 evenly opened along the circumference. The hole diameter is designed to be 10mm-20mm, and its larger size takes into account both flow capacity and radial injection kinetic energy, promoting the diffusion of oil and gas towards the edge of the isolation chamber 8. The edge of the large end of the diversion cone 4 is fixed with a horizontal perforated plate 6 by beveling weld. The outer edge of the perforated plate 6 is fully welded to the inner wall of the tank 1 to achieve zero leakage. The welding process ensures structural rigidity and avoids the risk of oil and gas short circuit. The perforated plate 6 completely covers the large end opening of the diversion cone 4 and the annular area between the diversion cone 4 and the inner wall of the tank 1, forming a global airflow distribution interface. Several second flow equalization holes 7 with a diameter of 2mm-10mm are laser-cut on it. The micropore design provides uniform resistance, forcing the airflow to rise vertically, while the pore size is much smaller than the adsorbent particle size to prevent media leakage.

[0038] like Figure 3 , Figure 6 As shown, in this embodiment, the polished outer surface of the diversion cone 4, the finely flattened lower surface of the perforated plate 6, and the milled bottom of the tank 1 together form an isolation chamber 8. This chamber is strictly located within the annular space between the diversion cone 4 and the inner wall of the tank 1. The height of the chamber is set to 100mm-300mm to provide sufficient buffer volume for multi-directional injection of oil and gas, achieving kinetic energy dissipation and concentration balance. The first flow equalization orifice 5 is arranged along the cone surface of the diversion cone 4 through fluid simulation optimization, and its orifice diameter is significantly larger than that of the second flow equalization orifice 7, forming a graded control mechanism of "coarse diffusion from the first flow equalization orifice 5 to fine flow equalization from the second flow equalization orifice 7".

[0039] like Figure 5As shown, in this embodiment, the perforated plate 6 has an opening ratio of 35%-40% in the central region of the corresponding large end opening of the diversion cone 4, and an opening ratio of 30%-35% in the corresponding annular region. The higher opening ratio in the central region alleviates the impact pressure directly above the inlet, while the slightly lower opening ratio in the annular region strengthens the edge constraint, thus synergistically achieving a balanced load across the entire adsorption bed. The edge of the large end of the diversion cone 4 is fixed to the inner edge of the perforated plate 6 by double-sided fillet welds, and the outer edge of the perforated plate 6 is sealed to the inner wall of the tank 1 by circumferential sealing welds. The fully welded structure ensures the absolute airtightness of the isolation chamber 8, preventing oil and gas bypass.

[0040] This utility model also provides the operating principle of a tertiary oil and gas recovery device:

[0041] When tanker trucks unload oil into underground storage tanks, the high-concentration oil and gas in the underground storage tanks, due to pressure changes, enters the oil and gas inlet flange 3 at the bottom of tank 1, and then enters the diversion cone 4, forming a dual-path diversion: part of the oil and gas is injected into the isolation chamber 8 through the first flow equalization hole 5 on the cone surface. After kinetic energy dissipation and pressure equalization in the chamber through turbulent collisions, it penetrates the second flow equalization hole 7 of the porous plate 6 covering the top of the chamber and enters the adsorbent bed 9; the other part of the oil and gas flows directly out from the open end of the diversion cone 4, vertically penetrating the porous plate 6 at the open end and injecting into the central area of ​​the adsorbent bed 9. The two airflows converge at the bottom of the adsorbent bed 9, and are constrained by the micropores distributed throughout the porous plate 6 to form a uniform upward flow field. The small aperture design of the second flow equalization hole 7 effectively weakens the airflow impact force, ensuring that volatile organic compounds are uniformly adsorbed on the adsorbent cross section. The purified gas is finally discharged from the top outlet in compliance with standards. After adsorption saturation, the enriched oil and gas is sent back to the storage tank for liquefaction and recovery through vacuum desorption.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tertiary oil and gas recovery device, characterized in that: The tank (1) includes a purified gas outlet (2) connected to the upper part of the tank (1), an oil and gas inlet flange (3) connected to the bottom of the tank (1), and an adsorbent bed (9) inside the tank (1). A diversion cone (4) is fixedly connected to the inner side of the bottom of the tank (1). The small end of the diversion cone (4) points to and connects to the direction of the oil and gas inlet flange (3), and the large end faces the direction of the adsorbent bed (9). The cone surface of the diversion cone (4) is closed and a number of first flow equalization holes (5) are evenly opened. A horizontal perforated plate (6) is set on the edge of the large end of the diversion cone (4). The outer edge of the perforated plate (6) is sealed to the inner wall of the tank (1). The perforated plate (6) covers the open end of the diversion cone (4) and the annular area between the diversion cone (4) and the inner wall of the tank (1). A number of second flow equalization holes (7) are evenly opened on the perforated plate (6). The outer surface of the diversion cone (4), the lower surface of the perforated plate (6), and the bottom of the tank (1) together form an isolation chamber (8), which is located between the diversion cone (4) and the inner wall of the tank (1).

2. The tertiary oil and gas recovery device according to claim 1, characterized in that: The first flow equalization orifice (5) is evenly distributed along the circumferential direction of the cone surface of the flow divider cone (4), and its diameter is larger than that of the second flow equalization orifice (7).

3. The tertiary oil and gas recovery device according to claim 1, characterized in that: The diameter of the first flow equalization hole (5) ranges from 10mm to 20mm.

4. The tertiary oil and gas recovery device according to claim 1, characterized in that: The diameter of the second flow equalization hole (7) ranges from 2mm to 10mm.

5. The tertiary oil and gas recovery device according to claim 1, characterized in that: The perforation rate of the perforated plate (6) in the central region of the large end opening of the corresponding diversion cone (4) is higher than that in the annular region of the corresponding isolation chamber (8).

6. The tertiary oil and gas recovery device according to claim 5, characterized in that: The perforated plate (6) has a central area perforation rate of 35%-40% and an annular area perforation rate of 30%-35%.

7. The tertiary oil and gas recovery device according to claim 1, characterized in that: The distance between the large end of the diversion cone (4) and the bottom surface of the tank (1) is 100mm-300mm, and this distance constitutes the height of the isolation chamber (8).

8. The tertiary oil and gas recovery device according to claim 1, characterized in that: The outer edge of the perforated plate (6) is sealed to the inner wall of the tank (1) by welding.

9. A tertiary oil and gas recovery device according to claim 1, characterized in that: The large end edge of the diversion cone (4) is fixedly connected to the inner edge of the perforated plate (6) by welding.

10. A tertiary oil and gas recovery device according to claim 1, characterized in that: Several vertical support frames (10) are installed at the bottom of the tank (1).

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