An injection device and method for a gas-liquid mixed medium

Abstract

An injection device and method for gas-liquid mixed medium, which relates to the field of petrochemical industry. In the present invention, the atomizing agent and additive ejected by the inner nozzle and the outer nozzle form a gas-liquid two-phase flow in the diversion pipe, and the gas-liquid two-phase flow is evenly sprayed into the main pipe through the injection head, so as to increase the contact area between the gas-liquid two-phase flow and the medium in the main pipe and the coverage rate of the gas-liquid two-phase flow on the inner wall of the main pipe, and then form a protective film on the inner wall of the main pipe or react chemically with the medium in the main pipe, thereby slowing down the corrosion of the main pipe and reducing the occurrence of accidents, etc., which is suitable for wide promotion and application.

Description

Technical Field

[0001] The present invention relates to the field of petrochemical engineering, and particularly to an injection device and method for gas-liquid mixed media. Background Art

[0002] It is known that with the increasingly deteriorating global petroleum quality, the amount of sulfur-containing and high-sulfur crude oil is gradually increasing. How to effectively avoid the corrosion of the oil and gas pipelines at the top of the atmospheric and vacuum distillation towers has become an urgent problem to be solved, and it is also related to the safety of the refinery.

[0003] To avoid the above technical problems, the current common method adopted by refineries is to directly inject additives through pipelines, that is, to disperse the additives by the velocity of the medium in the main pipeline. Since the velocity of the medium in the main pipeline is relatively low, the dispersibility of the additives is poor. Therefore, the additives are not well dispersed and cannot form a uniform protective film in the main pipeline, resulting in serious corrosion of the main pipeline and so on.

[0004] In addition, the inventor found through retrieval that for a Chinese patent with the patent application number CN202120914832.X, the application date of April 29, 2021, and the publication number CN214781674U, and the patent name of an anti-blocking rotary distributor, the injection method of the additives in this patent adopts an impeller form, using the kinetic energy of the medium in the main pipeline to drive the impeller to rotate, and using the blades of the impeller to disperse the additives, so as to evenly distribute the additives into the main pipeline. Although this solution can solve the above technical problems, due to the harsh environment in the main pipeline and the factor that the oil and gas are prone to coke formation, the impeller often gets stuck.

[0005] Therefore, in order to enhance the reliability of the additive injection device itself and improve the additive dispersion effect, it is very necessary to develop an injection device and method for gas-liquid mixed media to solve the problem of corrosion of the oil and gas pipelines in the refinery. Summary of the Invention

[0006] To overcome the deficiencies in the background art, the present invention provides an injection device and method for gas-liquid mixed media. The present invention can atomize the additives and then evenly spray them into the main pipeline, and then form a protective film on the inner wall of the main pipeline or chemically react with the medium in the main pipeline, thereby slowing down the corrosion of the main pipeline and reducing the occurrence of accidents, etc.

[0007] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0008] An injection device for a gas-liquid mixed medium, comprising an additive connection pipe, an atomizing agent connection pipe, an outer pipe, a diversion pipe and a spray head. An outer pipe is sleeved around the periphery of the additive connection pipe. A sealing ring is provided between the inner edge surface of the upper part of the outer pipe and the outer edge surface of the additive connection pipe. An atomizing agent connection pipe that penetrates to the inner edge surface of the outer pipe is provided on the outer edge surface of the outer pipe below the sealing ring. An atomizing agent channel is formed by the cavity between the outer edge surface of the additive connection pipe and the inner edge surface of the outer pipe. An inner nozzle is provided at the lower end of the additive connection pipe, and an outer nozzle is provided at the lower end of the outer pipe. The lower end of the outer nozzle is connected to the diversion pipe, and the diversion pipe is inserted into the main pipe. A spray head is provided at the lower end of the diversion pipe to form the injection device for the gas-liquid mixed medium.

[0009] For the injection device for the gas-liquid mixed medium, the outer nozzle has a conical structure with a large upper opening and a small lower opening.

[0010] For the injection device for the gas-liquid mixed medium, the inner nozzle has a conical structure with a large upper opening and a small lower opening.

[0011] For the injection device for the gas-liquid mixed medium, a valve is provided on the diversion pipe.

[0012] For the injection device for the gas-liquid mixed medium, an additive or an atomizing agent is introduced into the additive connection pipe.

[0013] For the injection device for the gas-liquid mixed medium, an atomizing agent or an additive is introduced into the atomizing agent connection pipe.

[0014] For the injection device for the gas-liquid mixed medium, a cavity is provided in the middle of the spray head. A gas-liquid two-phase flow inlet that penetrates to the cavity is provided on the upper surface of the spray head, and a gas-liquid two-phase flow outlet that penetrates to the cavity is provided on the left end surface or the right end surface of the spray head.

[0015] For the injection device for the gas-liquid mixed medium, the second structure of the spray head is an elbow.

[0016] For the injection device for the gas-liquid mixed medium, the lower end of the additive connection pipe is at the same height as the lower end of the outer pipe, or the lower end of the additive connection pipe is higher than the lower end of the outer pipe, or the lower end of the additive connection pipe is lower than the lower end of the outer pipe.

[0017] A spraying method for a gas-liquid mixed medium, which is to respectively transport an additive and an atomizing agent to an inner nozzle and an outer nozzle through an additive connection pipe and an atomizing agent connection pipe. The additive is ejected from the inner nozzle, and the atomizing agent is ejected from the outer nozzle. The atomizing agent ejected from the outer nozzle shears, impacts, and breaks the additive, so that the additive is dispersed. The dispersed additive and the atomizing agent form a uniform gas-liquid two-phase flow. When the gas-liquid two-phase flow is transported to the spray head through a diversion pipe, it enters the inner cavity of the spray head from the gas-liquid two-phase flow inlet of the spray head and forms a rotational motion to generate a centrifugal force. When the gas-liquid two-phase flow reaches the gas-liquid two-phase flow outlet of the spray head, due to the release from the restraint of the wall surface, under the action of the centrifugal force, the gas-liquid two-phase flow is ejected, forming a spray with a diffusion angle and being evenly dispersed into the main pipe, increasing the contact area between the additive and the oil and gas in the main pipe and the contact area between the additive and the inner wall of the main pipe, forming a good and uniform protective film to prevent corrosion of the inner wall of the main pipe.

[0018] Adopting the above technical solution, the present invention has the following advantages:

[0019] In the present invention, the atomizing agent and the additive ejected from the inner nozzle and the outer nozzle form a gas-liquid two-phase flow in the diversion pipe. The gas-liquid two-phase flow is evenly sprayed into the main pipe through the spray head, thereby increasing the contact area between the gas-liquid two-phase flow and the medium in the main pipe and the coverage rate of the gas-liquid two-phase flow on the inner wall of the main pipe. Then, a protective film is formed on the inner wall of the main pipe or a chemical reaction occurs with the medium in the main pipe, thereby slowing down the corrosion of the main pipe and reducing the occurrence of accidents, etc., and is suitable for wide promotion and application. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a first schematic structural diagram of the spray head in the present invention;

[0022] Figure 3 is a schematic structural diagram of the present invention when a valve is provided;

[0023] Figure 4 is a second schematic structural diagram of the spray head in the present invention;

[0024] In the figure: 1. Additive inlet; 2. Atomizing agent inlet; 3. Additive connection pipe; 4. Atomizing agent connection pipe; 5. Outer pipe; 6. Inner nozzle; 7. Outer nozzle; 8. Diversion pipe; 9. Spray head; 10. Valve; 11. Atomizing agent; 12. Additive; 13. Gas-liquid two-phase flow; 14. Main pipe; 15. Spray; 16. Gas-liquid two-phase flow inlet; 17. Gas-liquid two-phase flow outlet. Detailed Embodiment

[0025] The present invention can be more specifically explained by the following embodiments, but the present invention is not limited to the following embodiments;

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Combined with the attached Figures 1 to 4 For a spraying device for a gas-liquid mixed medium according to the present invention, it includes an additive connection pipe 3, an atomizing agent connection pipe 4, an outer pipe 5, a diversion pipe 8 and a spray head 9. An outer pipe 5 is sleeved around the periphery of the additive connection pipe 3, and the additive connection pipe 3 and the outer pipe 5 form a sleeve structure. The lower end of the additive connection pipe 3 is at the same height as the lower end of the outer pipe 5, or the lower end of the additive connection pipe 3 is higher than the lower end of the outer pipe 5, or the lower end of the additive connection pipe 3 is lower than the lower end of the outer pipe 5. A sealing ring is provided between the inner peripheral surface of the upper part of the outer pipe 5 and the outer peripheral surface of the additive connection pipe 3. An atomizing agent connection pipe 4 that penetrates through to the inner peripheral surface of the outer pipe 5 is provided on the outer peripheral surface of the outer pipe 5 below the sealing ring. A cavity between the outer peripheral surface of the additive connection pipe 3 and the inner peripheral surface of the outer pipe 5 forms an atomizing agent flow channel. An inner nozzle 6 is provided at the lower end of the additive connection pipe 3, and an outer nozzle 7 is provided at the lower end of the outer pipe 5. The outer nozzle 7 is a conical structure with a large upper opening and a small lower opening. The inner nozzle 6 is a conical structure with a large upper opening and a small lower opening. The spraying directions of the inner nozzle 6 and the outer nozzle 7 respectively face the inner cavity of the diversion pipe 8. The lower end of the outer nozzle 7 is connected to the diversion pipe 8, and the diversion pipe 8 is inserted into the main pipe 14. A spray head 9 is provided at the lower end of the diversion pipe 8 to form the spraying device for the gas-liquid mixed medium.

[0029] Furthermore, during implementation, as Figure 3As shown, a valve 10 is provided on the diversion pipe 8. By setting the valve 10, if the present invention becomes blocked or experiences other failures during use, for easy maintenance, after closing the valve 10, the upper half of the present invention can be completely removed for maintenance and then reinstalled in its original position after the maintenance is completed. While preventing the harmful medium in the main pipe 14 from flowing out, it greatly reduces the labor intensity of maintenance and improves the maintenance efficiency, etc.

[0030] Furthermore, in the specific implementation of the present invention, an additive 12 or an atomizing agent 11 can be introduced into the additive connection pipe 3. An atomizing agent 11 or an additive 12 can be introduced into the atomizing agent connection pipe 4, that is, the media introduced into the additive connection pipe 3 and the atomizing agent connection pipe 4 can be interchanged.

[0031] Furthermore, as Figure 1 、 2 shown, a cavity is provided in the middle of the spray head 9. An air-liquid two-phase flow inlet 16 communicating with the cavity is provided on the upper surface of the spray head 9, and an air-liquid two-phase flow outlet 17 communicating with the cavity is provided on the left end face or the right end face of the spray head 9. During implementation, the air-liquid two-phase flow inlet 16 of the spray head 9 can be set as an eccentric opening offset a certain distance from the axis, so that the air-liquid two-phase flow 13 entering the inner cavity of the spray head through the air-liquid two-phase flow inlet 16 forms a rotational movement in its inner cavity.

[0032] During implementation, as Figure 4 shown, the second structure of the spray head 9 is an elbow. When the spray head 9 is set as an elbow, the risk of blockage of the spray head 9 can be avoided to the greatest extent.

[0033] A spraying method for gas-liquid mixed medium, which is to respectively transport additive 12 and atomizing agent 11 to the inner nozzle 6 and the outer nozzle 7 through the additive inlet 1, the additive connecting pipe 3, the atomizing agent inlet 2, and the atomizing agent connecting pipe 4. The additive 12 is ejected from the inner nozzle 6, and the atomizing agent 11 is ejected from the outer nozzle 7. When the present invention is in the working state, the additive 12 is in a liquid state and the atomizing agent 11 is in a gaseous state. The additive 12 enters the inner nozzle 6 from the additive inlet 1 through the additive connecting pipe 3, and the atomizing agent 11 enters the outer nozzle 7 from the atomizing agent inlet 2 through the atomizing agent connecting pipe 4 and the atomizing agent flow channel. Since the atomizing agent 11 is mostly a high-pressure gas-phase medium, when it is ejected from the outer nozzle 7, the pressure energy is converted into kinetic energy, and the speed of the atomizing agent 11 at the outlet of the nozzle 7 can reach dozens of meters per second, even subsonic. The high-speed flowing atomizing agent 11 shears, impacts, and breaks the low-speed additive 12, and the additive 12 is broken into fine particles. That is, for the additive 12, the external force (impact, frictional force) is greater than the internal force (surface tension, intermolecular attraction) to produce an atomization phenomenon, so that the additive 12 is dispersed. The dispersed additive 12 and the atomizing agent 11 form a uniform gas-liquid two-phase flow 13. When the gas-liquid two-phase flow 13 is transported to the spray head 9 through the diversion pipe 8, it enters the inner cavity of the spray head 9 from the gas-liquid two-phase flow inlet 16 of the spray head 9 to form a rotational motion to generate a centrifugal force. When the gas-liquid two-phase flow 13 reaches the gas-liquid two-phase flow outlet 17 of the spray head 9, due to the release of the wall constraint effect, under the action of the centrifugal force, the gas-liquid two-phase flow 13 is ejected, forming a spray 15 with a diffusion angle and being evenly dispersed into the main pipe 14, increasing the contact area between the additive 12 and the oil and gas in the main pipe 14 and the contact area between the additive 12 and the inner wall of the main pipe 14, forming a good and uniform protective film to prevent the inner wall of the main pipe 14 from being corroded.

[0034] The parts not detailed in the present invention are prior art.

[0035] The embodiments selected herein for disclosing the invention purpose of the present invention are currently considered appropriate. However, it should be understood that the present invention is intended to include all changes and improvements of all embodiments belonging to the concept and scope of the invention.

Claims

1. An injection device for a gas-liquid mixed medium, comprising an additive connection pipe (3), an atomizing agent connection pipe (4), an outer pipe (5), a diversion pipe (8) and a spray head (9), characterized in that: at The periphery of the additive connection pipe (3) is sleeved with an outer pipe (5). A sealing ring is provided between the inner edge surface of the upper part of the outer pipe (5) and the outer edge surface of the additive connection pipe (3). An aerosol connection pipe (4) penetrating through to the inner edge surface of the outer pipe (5) is provided on the outer edge surface of the outer pipe (5) below the sealing ring. An aerosol channel is formed by the cavity between the outer edge surface of the additive connection pipe (3) and the inner edge surface of the outer pipe (5). An inner nozzle (6) is provided at the lower end of the additive connection pipe (3). The inner nozzle (6) is of a conical structure with a large upper opening and a small lower opening. An outer nozzle (7) is provided at the lower end of the outer pipe (5). The outer nozzle (7) is of a conical structure with a large upper opening and a small lower opening. The lower end of the outer nozzle (7) is connected to a diversion pipe (8). The diversion pipe (8) is inserted into the main pipe (14). A spray head (9) is provided at the lower end of the diversion pipe (8). A cavity is provided in the middle of the spray head (9). A gas-liquid two-phase flow inlet (16) penetrating through to the cavity is provided on the upper surface of the spray head (9). A gas-liquid two-phase flow outlet (17) penetrating through to the cavity is provided on the left end surface or the right end surface of the spray head (9) to form the spray device for the gas-liquid mixed medium.

2. The injection device for a gas-liquid mixed medium according to claim 1, characterized in that: A valve (10) is provided on the diversion pipe (8).

3. The injection device for a gas-liquid mixed medium according to claim 1, characterized in that: An additive (12) or an aerosol (11) is introduced into the additive connection pipe (3).

4. The injection device for gas-liquid mixed medium according to claim 1, characterized in that: An aerosol (11) or an additive (12) is introduced into the aerosol connection pipe (4).

5. The injection device for gas-liquid mixed medium according to claim 1, characterized in that: The second structure of the spray head (9) is an elbow.

6. The injection device for a gas-liquid mixed medium according to claim 1, characterized in that: The lower end of the additive connection pipe (3) is at the same height as the lower end of the outer pipe (5), or the lower end of the additive connection pipe (3) is higher than the lower end of the outer pipe (5), or the lower end of the additive connection pipe (3) is lower than the lower end of the outer pipe (5).

7. A spraying method of a spraying device for a gas-liquid mixed medium according to any one of claims 1 to 6, characterized in that: The method is to respectively transport the additive (12) and the aerosol (11) to the inner nozzle (6) and the outer nozzle (7) through the additive connection pipe (3) and the aerosol connection pipe (4). The additive (12) is ejected through the inner nozzle (6), and the aerosol (11) is ejected through the outer nozzle (7). The aerosol (11) ejected by the outer nozzle (7) shears, impacts and breaks the additive (12) to make the additive (12) discrete. The discrete additive (12) and the aerosol (11) form a uniform gas-liquid two-phase flow (13). When the gas-liquid two-phase flow (13) is transported to the spray head (9) through the diversion pipe (8), it enters the inner cavity of the spray head (9) from the gas-liquid two-phase flow inlet (16) of the spray head (9) to form a rotational motion to generate a centrifugal force. When the gas-liquid two-phase flow (13) reaches the gas-liquid two-phase flow outlet (17) of the spray head (9), due to getting rid of the constraint of the wall surface, under the action of the centrifugal force, the gas-liquid two-phase flow (13) is ejected to form a spray (15) with a diffusion angle and is evenly dispersed into the main pipe (14), increasing the contact area between the additive (12) and the oil and gas in the main pipe (14) and the contact area between the additive (12) and the inner wall of the main pipe (14), forming a good and uniform protective film to prevent corrosion of the inner wall of the main pipe (14).

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