A benzene hydrogenation polymerization inhibitor injection device

Abstract

The utility model discloses a kind of benzene hydrogenation polymerization inhibitor injection devices, belong to crude benzene processing technical field, including polymerization inhibitor storage tank, polymerization inhibitor storage tank is connected with the injection point of heavy benzene processing tower by feeding pump, first check valve and polymerization inhibitor filling pipeline;It is characterized by: the tank body outside of polymerization inhibitor high tank is provided with the jacket for the heat preservation of polymerization inhibitor, the discharge port of polymerization inhibitor high tank is connected with polymerization inhibitor filling pipeline by high tank material guiding pipe, and located the end portion of high tank material guiding pipe is connected with polymerization inhibitor filling pipeline by second check valve, the high tank material guiding pipe outside is provided with the sleeve for the heat preservation of polymerization inhibitor.The utility model has the beneficial effects that: benzene hydrogenation polymerization inhibitor injection device of polymerization inhibitor by pump filling and gravity filling, cooperate check valve, polymerization inhibitor high tank can be in pump abnormal working, rely on gravity to fill the injection point of heavy benzene processing tower with polymerization inhibitor.

Description

Technical Field

[0001] This utility model relates to the field of crude benzene processing technology, specifically to a benzene hydrogenation inhibitor injection device. Background Technology

[0002] In the crude benzene hydrogenation industry, crude benzene needs to undergo de-gravity treatment. The supply system of polymerization inhibitors in the crude benzene hydrogenation unit plays an important role in preventing olefin polymerization, deposition, and blockage in the crude benzene after de-gravity treatment, thereby ensuring production safety and reaction efficiency.

[0003] Currently, polymerization inhibitors are typically pumped from storage tanks to injection points. The reliability of the pump directly affects the continuous supply of the polymerization inhibitor. Therefore, a configuration of a main pump and a backup pump is often used to ensure that the supply can be switched in case of a failure of the main pump.

[0004] However, the shortcomings of the existing technology are obvious. First, pumps are mechanical devices and are prone to failure, such as impeller damage, seal failure, or motor failure, which can lead to an interruption in the supply of polymerization inhibitor. Although a backup pump is set up, there is a delay in pump switching, and instantaneous seamless switching cannot be achieved. Especially in emergency situations, the interruption of the polymerization inhibitor supply may cause safety risks such as abnormal reactor temperature and pressure rise. Second, the pump fault detection and automatic switching system is relatively complex and has high maintenance costs. Utility Model Content

[0005] To solve the above problems and overcome the shortcomings of the prior art, this utility model provides a benzene hydrogenation inhibitor injection device; The first technical problem to be solved was that the pumps were prone to failure, which could lead to an interruption in the supply of the polymerization inhibitor. Although a backup pump was set up, there was a delay in switching the pumps, and it was impossible to achieve instantaneous and seamless switching. Especially in emergency situations, the interruption of the polymerization inhibitor supply could cause safety risks such as abnormal reactor temperature and pressure rise.

[0006] The specific technical solution of this utility model to solve the above-mentioned technical problems is as follows: the benzene hydrogenation inhibitor injection device includes an inhibitor storage tank, which is connected to the injection point of the heavy benzene treatment tower through a feeding pump, a first one-way valve and an inhibitor injection pipeline; the feature is that it also includes an inhibitor high-level tank. The high-level tank for polymerization inhibitor is equipped with a jacket on the outside of the tank body for heat preservation of the polymerization inhibitor. The outlet of the high-level tank for polymerization inhibitor is connected to the polymerization inhibitor injection pipeline through the high-level tank guide pipe, and the end of the high-level tank guide pipe is connected to the polymerization inhibitor injection pipeline through a second one-way valve. The outer side of the high-level tank feed pipe is equipped with a sleeve for heat preservation of the polymerization inhibitor.

[0007] Furthermore, the height of the high-level tank for the polymerization inhibitor is not less than 20m.

[0008] Furthermore, the jacket is provided with a heating medium inlet and a heating medium outlet.

[0009] Furthermore, the sleeve has a heating medium inlet and a heating medium outlet.

[0010] Furthermore, the high-level inhibitor tank includes a tank body and a tank cover. The tank body is provided with a jacket on the outside, and the tank cover is provided with an exhaust port, a feed port and a safety valve.

[0011] Furthermore, the high-level tank for the polymerization inhibitor is erected at a height of not less than 20m by a support frame.

[0012] The beneficial effects of this utility model are: One advantage of this invention is that it provides a benzene hydrogenation inhibitor injection device that relies on pump injection and gravity injection of the inhibitor. With the help of a check valve, the high-level tank of the inhibitor can inject the inhibitor into the injection point of the heavy benzene treatment tower by gravity when the pump is not working properly. One advantage of this invention is that both the high-level tank for the polymerization inhibitor and the feed pipe of the high-level tank are provided with heat-insulating and heating sleeves or jackets. This can prevent the polymerization inhibitor from condensing and clogging due to the influence of external temperature on high-level and long-distance high-altitude pipelines. It can also ensure the fluid state of the polymerization inhibitor in the high-level tank for the polymerization inhibitor and the feed pipe of the high-level tank, and avoid clogging due to long-term disuse. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the high-level tank structure of this utility model; In the diagram: 1. High-level inhibitor tank, 2. Inhibitor storage tank, 3. Heavy benzene treatment tower, 4. Feed pump, 5. First check valve, 6. Heavy benzene outgoing pipeline, 7. Crude benzene incoming pipeline. 11. Support, 12. Safety valve, 13. Inlet, 14. Exhaust port, 15. Tank cover, 16. Tank body, 17. Jacket, 18. High-level tank feed pipe, 19. Sleeve, 20. Second check valve. Detailed Implementation

[0014] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "rear," "lower left," "upper right," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limiting the scope of protection of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] The specific embodiment of this utility model is as follows: The benzene hydrogenation inhibitor injection device includes an inhibitor storage tank 2, which is connected to the injection point of the heavy benzene treatment tower 3 via a feed pump 4, a first one-way valve 5, and an inhibitor injection pipeline; the improvement of this utility model is as follows: It also includes a high-level tank for polymerization inhibitors, 1; According to the production process requirements of this product, the injection point pressure is 10 kPa, the polymerization inhibitor density is 0.95 g / cm3, and the polymerization inhibitor injection rate is 2.5 L / h. Specifically, if a DN20 pipe is used, the flow rate is approximately 1.34 m / s. Therefore, as a preferred option, in order to ensure that the polymerization inhibitor can overcome the injection point pressure by gravity and be successfully injected into the heavy benzene treatment tower 3, the height of the high-level tank 1 for the polymerization inhibitor needs to be no less than 20m. As a preferred embodiment of this invention, in order to prevent the polymerization inhibitor in the high-level tank 1 located at a high altitude and the high-level tank guide pipe 18 for long-distance transportation from condensing and clogging due to excessively low ambient temperature, this invention adopts the following: The outer side of the tank body 16 of the high-level tank 1 of the polymerization inhibitor is provided with a jacket 17 for heat preservation of the polymerization inhibitor. The outlet of the high-level tank 1 of the polymerization inhibitor is connected to the polymerization inhibitor injection pipeline through the high-level tank guide pipe 18, and the end of the high-level tank guide pipe 18 is connected to the polymerization inhibitor injection pipeline through a second one-way valve 20. The outer side of the high-level tank guide pipe 18 is provided with a sleeve 19 for heat preservation of the polymerization inhibitor.

[0016] As a further limitation, the jacket 17 is provided with a heating medium inlet and a heating medium outlet.

[0017] Similarly, the sleeve 19 has a heating medium inlet and a heating medium outlet.

[0018] As a supplement, the high-level inhibitor tank 1 includes a tank body 16 and a tank cover 15. A jacket 17 is provided on the outside of the tank body 16, and the tank cover 15 is provided with an exhaust port 14, a feed port 13 and a safety valve 12.

[0019] The high-level tank 1 for the polymerization inhibitor is erected at a height of not less than 20m by a support 11.

[0020] It should be noted that this utility model is a benzene hydrogenation inhibitor injection device. In specific operation, 1. During normal operation, crude benzene from crude benzene inlet pipeline 7 is pumped into heavy benzene treatment tower 3. After treatment in heavy benzene treatment tower 3, a polymerization inhibitor needs to be added to the heavy benzene. At this time, the polymerization inhibitor storage tank 2 is injected into the heavy benzene treatment tower 3 through the injection point via the feed pump 4, the first one-way valve 5, and the polymerization inhibitor injection pipeline. After mixing with the heavy benzene, the polymerization of heavy benzene is inhibited. The above are all common knowledge and are not within the scope of protection of this utility model. The principles will not be elaborated further. 2. The difference is that when the feed pump 4 malfunctions, the pressure in the polymerization inhibitor injection pipeline decreases. The high-level inhibitor tank 1, relying on gravity, opens the second one-way valve 20 and injects the inhibitor into the heavy benzene treatment tower 3 through the injection point. After mixing with the heavy benzene, it inhibits the polymerization of the heavy benzene. It should be noted that: the first one-way valve 5 can prevent the polymer inhibitor conveyed by gravity in the high-level tank 1 from overflowing from the feed pump 4 and releasing pressure; similarly, the second one-way valve 20 can prevent the polymer inhibitor pressurized by the feed pump 4 from flowing back into the high-level tank feed pipe 18, causing unstable pressure in the polymer inhibitor injection pipeline.

[0021] 3. As a preferred option, the heating medium can be provided separately to prevent the polymerization inhibitor from condensing; alternatively, the cooling medium from the subsequent benzene hydrogenation process can be used, as its temperature is sufficient to prevent the polymerization inhibitor from condensing. 4. As a preferred option, operators will periodically stop the pump for maintenance. This is not only for the maintenance of the feed pump 4, but also to manually activate the function of the high-level inhibitor tank 1 to prevent the inhibitor from causing problems due to long-term storage in the high-level inhibitor tank 1.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A benzene hydrogenation inhibitor injection device, comprising an inhibitor storage tank (2), the inhibitor storage tank (2) being connected to the injection point of a heavy benzene treatment tower (3) via a feed pump (4), a first check valve (5) and an inhibitor injection pipeline; characterized in that: It also includes a high-level tank for polymerization inhibitors (1); The outer side of the tank body (16) of the high-level inhibitor tank (1) is provided with a jacket (17) for heat preservation of the inhibitor. The outlet of the high-level inhibitor tank (1) is connected to the inhibitor injection pipeline through the high-level tank guide pipe (18), and the end of the high-level tank guide pipe (18) is connected to the inhibitor injection pipeline through a second one-way valve (20). The outer side of the high-level tank feed pipe (18) is provided with a sleeve (19) for heat preservation of the polymerization inhibitor.

2. The benzene hydrogenation inhibitor injection device according to claim 1, characterized in that... The height of the high-level tank (1) for the polymerization inhibitor is not less than 20m.

3. The benzene hydrogenation inhibitor injection device according to claim 1, characterized in that... The jacket (17) is provided with a heating medium inlet and a heating medium outlet.

4. The benzene hydrogenation inhibitor injection device according to claim 1, characterized in that... The sleeve (19) has a heating medium inlet and a heating medium outlet.

5. The benzene hydrogenation inhibitor injection device according to claim 1, characterized in that... The high-level tank (1) for the polymerization inhibitor includes a tank body (16) and a tank cover (15). A jacket (17) is provided on the outside of the tank body (16), and the tank cover (15) is provided with an exhaust port (14), a feed port (13) and a safety valve (12).

6. The benzene hydrogenation inhibitor injection device according to claim 1, characterized in that... The high-level tank (1) for the polymerization inhibitor is erected at a height of not less than 20m by a support (11).

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