A crude benzol hydrogenation temperature control device

Abstract

The utility model relates to a technical field of chemical equipment, concretely relates to a crude benzol hydrogenation temperature control equipment, the utility model provides a crude benzol hydrogenation temperature control equipment, including feeding pipe, the feeding pipe both ends are provided with material inlet and material outlet, the feeding pipe is connected with primary venture mixer and secondary venture mixer in proper order along material flow direction, the feeding pipe outside is provided with the clamping sleeve, the clamping sleeve is provided with the heat medium import and heat medium export, the inner chamber of clamping sleeve and the outer wall of feeding pipe constitute heat exchange chamber, be provided with spiral guide vane in heat exchange chamber, spiral guide vane divides heat exchange chamber into continuous spiral flow channel, the temperature sensing element is embedded in the wall of feeding pipe, temperature sensing element is connected to external temperature control system.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a temperature control device for crude benzene hydrogenation. Background Technology

[0002] The hydrogenation of crude benzene is a key step in the refining of crude benzene. Its core function is to remove impurities such as sulfur and nitrogen and convert them into high-value-added products like cyclohexane through a hydrogenation reaction with hydrogen in the presence of a catalyst. Temperature control is a crucial parameter in this process, directly affecting the reaction rate, conversion rate, and product quality: too low a temperature will lead to incomplete reaction, while too high a temperature may trigger side reactions or cause coking in the equipment.

[0003] Traditional crude benzene hydrogenation temperature control equipment typically uses a single-stage Venturi mixer or a simple spray structure to mix the material and hydrogen. The uniformity of the mixture depends on the natural diffusion of the fluid, which can easily lead to local concentration deviations. The heat exchange chamber often uses a straight tube or a simple spiral structure, which can easily create dead zones in the flow of the heat medium, resulting in low heat exchange efficiency. Temperature monitoring relies on a single-point sensor, which cannot meet the zoned temperature control requirements of multi-stage mixing processes (such as "coarse mixing-fine mixing"). In addition, insufficient flow rate during the mixing process can easily lead to the deposition of substances such as tar on the pipe wall, creating a coking hazard and affecting the long-term stable operation of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide a temperature control device for crude benzene hydrogenation, which achieves efficient material mixing, precise temperature control, and anti-coking functions through multi-stage Venturi mixing, spiral heat exchange, and zoned temperature control design.

[0005] The present invention provides a temperature control device for crude benzene hydrogenation, comprising a feeding pipe with a material inlet and a material outlet at both ends. A primary Venturi mixer and a secondary Venturi mixer are sequentially connected to the feeding pipe along the material flow direction. A jacket is provided outside the feeding pipe, with a heat medium inlet and a heat medium outlet on the jacket. The inner cavity of the jacket and the outer wall of the feeding pipe form a heat exchange chamber. A spiral guide plate is provided inside the heat exchange chamber, dividing the heat exchange chamber into continuous spiral channels. A temperature sensing element is embedded in the wall of the feeding pipe and connected to an external temperature control system.

[0006] In a preferred embodiment of this invention, both the primary and secondary Venturi mixers are constructed by connecting a mixing chamber and a diffusion chamber. One end of the mixing chamber is equipped with a nozzle, and the side wall of the mixing chamber has a feed pipe. A throat is located at the connection between the mixing chamber and the diffusion chamber, and the inner diameter of the diffusion chamber gradually increases from the throat outwards. The diffusion chamber of the primary Venturi mixer is connected to the feed pipe of the secondary Venturi mixer via a feed pipe. During use, the nozzle is connected to an external pressurized gas supply device to provide high-speed hydrogen gas for mixing with crude benzene.

[0007] As a preferred embodiment of this invention, the throat diameter of the primary Venturi mixer is larger than that of the secondary Venturi mixer.

[0008] In a preferred embodiment of this invention, the material inlet of the feeding pipe is connected to the feed pipe in the primary Venturi mixer, and the material outlet of the feeding pipe is connected to the diffusion chamber of the secondary Venturi mixer.

[0009] As a preferred embodiment of this invention, the secondary Venturi mixer is provided with a drain outlet located below the diffusion chamber.

[0010] As a preferred embodiment of this utility model, a first annular distribution plate is provided between the primary Venturi mixer and the secondary Venturi mixer, and a plurality of first guide holes are uniformly formed on the first annular distribution plate; a second annular distribution plate is provided between the secondary Venturi mixer and the material outlet, and a plurality of second guide holes are uniformly formed on the second annular distribution plate.

[0011] As a preferred embodiment of this utility model, the jacket is disposed on the feed pipe between the primary Venturi mixer and the secondary Venturi mixer.

[0012] As a preferred embodiment of this utility model, the temperature sensing element is located in the middle of the primary Venturi mixer, the secondary Venturi mixer, and the feed pipe in the jacket.

[0013] As a preferred embodiment of this invention, the pitch of the spiral guide plate gradually decreases along the direction of heat medium flow.

[0014] The advantages of this utility model compared with the prior art are as follows: 1. Multi-stage mixing improves uniformity: The first-stage Venturi mixer achieves "coarse mixing" of crude benzene and hydrogen through negative pressure in the throat, while the second-stage Venturi mixer further "fine mixing". Combined with the strong vortex generated by the Venturi effect, the mixing uniformity is significantly better than that of traditional static mixers or spray structures.

[0015] 2. Spiral flow guide to enhance heat transfer: The spiral guide plate guides the heat medium to flow spirally along the heat exchange cavity, reducing the flow dead zone and improving the heat transfer efficiency; the design of the spiral pitch decreasing along the flow direction of the heat medium can adapt to changes in the temperature of the heat medium and maintain a stable heat transfer rate.

[0016] 3. Precise and energy-saving zoned temperature control: Temperature sensing elements monitor the temperature at different locations in the feed pipe (corresponding to different stages of mixing) in real time. The temperature control system adjusts the flow rate or temperature of the heat transfer medium according to the data to achieve independent zoned temperature control of the "coarse mixing section - fine mixing section", avoiding local overheating / overcooling, reducing energy consumption and protecting the equipment.

[0017] 4. Anti-coking and self-cleaning: The high-speed fluid (crude benzene, hydrogen and hydrogen-crude benzene mixture) in the Venturi throat strongly scours the pipe wall, inhibiting tar deposition; the drain port below the diffusion chamber of the secondary Venturi mixer facilitates the periodic discharge of small amounts of polymer or impurities, extending the equipment maintenance cycle. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a temperature control device for the hydrogenation of crude benzene according to this utility model.

[0019] Figure 2 This is a cross-sectional three-dimensional structural diagram of a crude benzene hydrogenation temperature control device according to the present invention.

[0020] Figure 3 This is an enlarged structural diagram of the heat exchange cavity at point A of a crude benzene hydrogenation temperature control device according to this utility model.

[0021] Figure 4 This is an enlarged structural diagram of the drain outlet at point B of a crude benzene hydrogenation temperature control device according to this utility model.

[0022] As shown in the figure: 1. Feed pipe; 2. Material inlet; 3. Material outlet; 4. Primary Venturi mixer; 5. Secondary Venturi mixer; 6. Jacket; 7. Heat medium inlet; 8. Heat medium outlet; 9. Heat exchange chamber; 10. Spiral guide plate; 11. Temperature sensing element; 12. Mixing chamber; 13. Diffusion chamber; 14. Nozzle; 15. Feed pipe; 16. Throat; 17. First annular distribution plate; 18. First guide hole; 19. Second annular distribution plate; 20. Second guide hole; 21. Drain outlet. Detailed Implementation

[0023] 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.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within 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.

[0025] As per the instruction manual Figure 1-4 As shown, the crude benzene hydrogenation temperature control equipment includes a feed pipe 1, with a material inlet 2 at its left end and a material outlet 3 at its right end. Along the material flow direction, the feed pipe 1 is connected in sequence to a primary Venturi mixer 4 and a secondary Venturi mixer 5, both of which are connected by flanges (not shown in the figure).

[0026] In this utility model, both the primary Venturi mixer 4 and the secondary Venturi mixer 5 are composed of a mixing chamber 12, a throat 16, and a diffusion chamber 13. The left end of the mixing chamber 12 is provided with a nozzle 14 (connected to an external hydrogen pressurization device), and the side wall is provided with a feed pipe 15 (the primary Venturi mixer 4 is connected to crude benzene, and the secondary Venturi mixer 5 is connected to the mixture from the primary Venturi mixer 4). The throat 16 is connected to the right end of the mixing chamber 12, and the diffusion chamber 13 is connected to the right end of the throat 16. The inner diameter of the diffusion chamber 13 gradually increases from the throat 16 outwards.

[0027] In this utility model, a jacket 6 is provided on the feed pipe section between the primary diffusion chamber 13 and the secondary feed pipe 15. The left end of the jacket 6 is the heat medium inlet 7, and the right end is the heat medium outlet 8. A heat exchange cavity 9 is formed inside the jacket 6. A spiral guide plate 10 is provided inside the heat exchange cavity 9, and its pitch gradually decreases along the flow direction of the heat medium.

[0028] In this utility model, the temperature sensing element 11 (such as a platinum resistance sensor) is embedded in the wall of the feeding pipe 1. Specifically, the feeding pipe 1 is located at the left end (near the material inlet 2), the middle (there are multiple feeding pipes 1 between the first and second stage Venturi mixers 5), and the right end (near the material outlet 3) of the feeding pipe 1 corresponding to the jacket 6, for a total of three groups, which are used to monitor the material temperature of the "coarse mixing section", "transition section" and "fine mixing section" respectively.

[0029] In this utility model, a first annular distribution plate 17 is fixed on the feed pipe 1 between the primary Venturi mixer 4 and the secondary Venturi mixer 5, and a first guide hole 18 with a diameter of φ5mm is evenly opened on it; a second annular distribution plate 19 is fixed on the feed pipe 1 between the secondary Venturi mixer 5 and the material outlet 3, and a second guide hole 20 with a diameter of φ3mm is evenly opened on it.

[0030] In this invention, the bottom of the diffusion chamber 13 of the secondary Venturi mixer 5 is provided with a drain port 21 (diameter φ20mm) for discharging deposited tar or polymer impurities.

[0031] Working principle: 1. Material mixing with hydrogen: Crude benzene enters the feed pipe 1 from the material inlet 2, while the external hydrogen pressurization equipment introduces high-speed hydrogen (flow rate of about 20-30 m / s) into the mixing chamber 12 of the first-stage Venturi mixer 4 through the nozzle 14. A negative pressure (vacuum degree of about -5 kPa) is formed in the mixing chamber 12 due to the contraction of the throat 16. The crude benzene is drawn in and violently collides and mixes with the hydrogen in the mixing chamber 12 and the throat 16 (completing the "coarse mixing"). The mixed material is decelerated and expanded in the first-stage diffusion chamber 13 (flow rate reduced to 5-10 m / s). Some of the material is dispersed through the guide holes of the first annular distribution plate 17 and enters the feed pipe 15 of the second-stage Venturi mixer 5.

[0032] 2. Secondary fine mixing and discharge: High-speed hydrogen gas (flow rate of about 15-25 m / s) is introduced again through the nozzle 14 of the secondary venturi mixer 5, and a higher negative pressure (vacuum degree of about -8 kPa) is formed in the mixing chamber 12. The material and hydrogen gas are further mixed in the throat tube 16 (completing the "fine mixing"). Finally, the uniformly mixed material is evenly distributed through the guide holes of the secondary diffusion chamber 13 and the second annular distribution plate 19, and then discharged from the material outlet 3 to the subsequent reaction process.

[0033] 3. Temperature Control: The heat transfer medium (such as heat transfer oil) enters the heat exchange chamber 9 of the jacket 6 from the heat transfer medium inlet 7, flows along the spiral flow channel formed by the spiral guide plate 10 (flow velocity of about 1-2 m / s), and fully contacts and exchanges heat with the wall of the feed pipe 1; the temperature sensing element 11 monitors the temperature at different positions of the feed pipe 1 in real time (such as the temperature T1 of the coarse mixing section, the temperature T2 of the transition section, and the temperature T3 of the fine mixing section), and feeds it back to the temperature control system. The system adjusts the flow rate of the heat transfer medium or the external heating power according to the temperature curve set by the process (such as the coarse mixing section needs to be heated to 120℃, and the fine mixing section needs to be maintained at 150℃) to achieve precise temperature control in different zones.

[0034] 4. Anti-coking and self-cleaning: The high-speed fluid (crude benzene, hydrogen and mixture) in the Venturi throat 16 strongly scours the pipe wall (shear force of about 500-1000Pa), inhibiting tar adhesion; a small amount of impurities generated by high-temperature polymerization are deposited at the bottom of the secondary diffusion chamber 13 and discharged by periodically opening the drain port 21 to avoid blockage.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A temperature control device for crude benzene hydrogenation, comprising a feeding pipe (1), wherein the feeding pipe (1) is provided with a material inlet (2) and a material outlet (3) at both ends, characterized in that: The feeding pipe (1) is connected in sequence to a primary Venturi mixer (4) and a secondary Venturi mixer (5) along the material flow direction. The feed pipe (1) is provided with a jacket (6) on the outside. The jacket (6) is provided with a heat medium inlet (7) and a heat medium outlet (8). The inner cavity of the jacket (6) and the outer wall of the feed pipe (1) form a heat exchange cavity (9). The heat exchange chamber (9) is provided with a spiral guide plate (10), which divides the heat exchange chamber (9) into a continuous spiral flow channel; A temperature sensing element (11) is embedded in the wall of the feeding pipe (1), and the temperature sensing element (11) is connected to an external temperature control system.

2. The temperature control device for crude benzene hydrogenation according to claim 1, characterized in that: The primary Venturi mixer (4) and the secondary Venturi mixer (5) are both constructed by splicing a mixing chamber (12) and a diffusion chamber (13). One end of the mixing chamber (12) is provided with a nozzle (14), and the side wall of the mixing chamber (12) is provided with a feed pipe (15). The connection between the mixing chamber (12) and the diffusion chamber (13) is provided with a throat (16), and the inner diameter of the diffusion chamber (13) gradually increases from the throat (16) outward. The diffusion chamber (13) of the primary Venturi mixer (4) is connected to the feed pipe (15) of the secondary Venturi mixer (5) through a feed pipe (1).

3. The temperature control device for crude benzene hydrogenation according to claim 2, characterized in that: The diameter of the throat (16) of the primary Venturi mixer (4) is greater than the diameter of the throat (16) of the secondary Venturi mixer (5).

4. The temperature control device for crude benzene hydrogenation according to claim 2, characterized in that: The material inlet (2) of the feed pipe (1) is connected to the feed pipe (15) in the primary Venturi mixer (4), and the material outlet (3) of the feed pipe (1) is connected to the diffusion chamber (13) of the secondary Venturi mixer (5).

5. The temperature control device for crude benzene hydrogenation according to claim 2, characterized in that: The secondary venturi mixer (5) is located below the diffusion chamber (13) and has a drain outlet (21).

6. The temperature control device for crude benzene hydrogenation according to claim 1, characterized in that: A first annular distribution plate (17) is provided between the primary Venturi mixer (4) and the secondary Venturi mixer (5), and a plurality of first guide holes (18) are uniformly opened on the first annular distribution plate (17); a second annular distribution plate (19) is provided between the secondary Venturi mixer (5) and the material outlet (3), and a plurality of second guide holes (20) are uniformly opened on the second annular distribution plate (19).

7. The temperature control device for crude benzene hydrogenation according to claim 1, characterized in that: The jacket (6) is located on the feed pipe (1) between the primary Venturi mixer (4) and the secondary Venturi mixer (5).

8. The temperature control device for crude benzene hydrogenation according to claim 1, characterized in that: The temperature sensing element (11) is located in the feed pipe (1) of the primary Venturi mixer (4), the secondary Venturi mixer (5) and the jacket (6).

9. The temperature control device for crude benzene hydrogenation according to claim 1, characterized in that: The pitch of the spiral guide plate (10) gradually decreases along the direction of heat medium flow.

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