Hydrogenation reaction device

Abstract

The utility model relates to the technical field of chemical engineering devices, and discloses a hydrogenation reaction device which comprises a hydrogen conveying unit, a hydrogenation raw material conveying unit, a first-section hydrogenation reactor and a high-pressure flash tank, and the hydrogen conveying unit, the hydrogenation raw material conveying unit and the high-pressure flash tank are all communicated with the first-section hydrogenation reactor; the hydrogen conveying unit comprises a fresh hydrogen supply tank, a circulating hydrogen safety buffer tank and a compressor, the output ends of the fresh hydrogen supply tank and the circulating hydrogen safety buffer tank are both communicated with the input end of the compressor, and the output end of the compressor is communicated with the hydrogen input end of the first-section hydrogenation reactor; and the input end of the circulating hydrogen safety buffer tank is communicated with the gas phase output end of the high-pressure flash tank. The circulating hydrogen safety buffer tank has the following technical effects that by arranging the circulating hydrogen safety buffer tank, the circulating utilization of hydrogen can be realized, the relative stability of the gas pressure and the gas flow of the compressor can be ensured, meanwhile, the influence of the vibration of the compressor on other parts in the device can be reduced, and the safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical engineering devices, and particularly relates to a hydrogenation reaction device. Background Art

[0002] At present, hydrogenation reaction devices are widely used in industries such as chemical pharmaceutical and petrochemical production. For example, in the process of petrochemical production, the cracked C9 fraction, which is a by-product of the ethylene plant, is generally used as fuel before treatment, causing great environmental harm, low utilization value, and poor economic benefits. The C9 fraction treated by hydrogenation can be used to produce aromatic solvents, high-quality hydrogenated blending oils and other products, and its utilization value can be significantly improved.

[0003] Existing hydrogenation reaction devices usually include a de-heavy tower unit, a first-stage hydrogenation reaction unit, a second-stage hydrogenation reaction unit, a stabilizer tower unit, etc. In the first-stage hydrogenation reaction unit, in order to enable the recycled use of hydrogen after hydrogenation treatment, a high-pressure flash tank is usually arranged downstream of the first-stage hydrogenation reactor to flash hydrogen from the material to become recycled hydrogen, and then it is transported back to the compressor. The compressor presses fresh hydrogen and recycled hydrogen into the first-stage hydrogenation reactor to participate in the reaction together. In this process, due to the large fluctuations in gas pressure and flow rate in the compressor, it is easy to increase the loss of the compressor and cause other safety accidents. At the same time, due to the instability of the internal air pressure of the compressor, it is easy to cause the compressor to vibrate excessively, thereby having an adverse impact on other parts of the device. Summary of the Utility Model

[0004] In order to solve the deficiencies of the above-mentioned prior art, the utility model provides a hydrogenation reaction device. By setting up a recycle hydrogen safety buffer tank, it can not only realize the recycled use of hydrogen, but also ensure the relative stability of the gas pressure and gas flow rate of the compressor, and at the same time reduce the impact of the vibration of the compressor on other parts of the device, improving the safety performance of the hydrogenation reaction device.

[0005] The technical effects to be achieved by the utility model are realized through the following technical aspects:

[0006] The utility model provides a hydrogenation reaction device, which includes a hydrogen delivery unit, a hydrogenation raw material delivery unit, a first-stage hydrogenation reactor, and a high-pressure flash tank. The hydrogen delivery unit is communicated with the hydrogen input end of the first-stage hydrogenation reactor, the hydrogenation raw material delivery unit is communicated with the raw material input end of the first-stage hydrogenation reactor, and the high-pressure flash tank is communicated with the output end of the first-stage hydrogenation reactor;

[0007] The hydrogen delivery unit includes a fresh hydrogen supply tank, a recycle hydrogen safety buffer tank, and a compressor. The output ends of the fresh hydrogen supply tank and the recycle hydrogen safety buffer tank are both connected to the input end of the compressor. The output end of the compressor is connected to the hydrogen input end of the first-stage hydrogenation reactor. The input end of the recycle hydrogen safety buffer tank is connected to the gas-phase output end of the high-pressure flash tank.

[0008] As a further description of the technical solution of the present utility model, a first condenser is connected to the gas-phase output end of the high-pressure flash tank. The liquid-phase output end of the first condenser is connected to the high-pressure flash tank, and the gas-phase output end of the first condenser is connected to the recycle hydrogen safety buffer tank.

[0009] As a further description of the technical solution of the present utility model, a buffer tank is also connected to the liquid-phase output end of the first condenser. The liquid-phase output end of the buffer tank is connected to the high-pressure flash tank, and the gas-phase output end of the buffer tank is connected to the recycle hydrogen safety buffer tank.

[0010] As a further description of the technical solution of the present utility model, a gas-liquid separation tank is also connected between the fresh hydrogen supply tank and the compressor.

[0011] As a further description of the technical solution of the present utility model, the liquid-phase output end of the high-pressure flash tank is connected to a second-stage hydrogenation feed pump.

[0012] As a further description of the technical solution of the present utility model, the liquid-phase output end of the high-pressure flash tank is connected to a low-pressure flash tank, and the liquid-phase output end of the low-pressure flash tank is connected to a product storage tank.

[0013] As a further description of the technical solution of the present utility model, a second condenser is connected to the gas-phase output end of the low-pressure flash tank. The liquid-phase output end of the second condenser is connected to the low-pressure flash tank, and the gas-phase output end of the second condenser is connected to a flare system.

[0014] As a further description of the technical solution of the present utility model, a circulation pump is connected to the liquid-phase output end of the high-pressure flash tank. The output end of the circulation pump is connected to a circulation cooler, and the output end of the circulation cooler is connected to the raw material input end of the first-stage hydrogenation reactor.

[0015] As a further description of the technical solution of the present utility model, the hydrogenation raw material delivery unit includes a raw material storage tank and a high-speed pump connected in sequence. The output end of the high-speed pump is connected to the raw material input end of the first-stage hydrogenation reactor.

[0016] As a further description of the technical solution of the present utility model, an oil-water separation tank is also connected between the raw material storage tank and the high-speed pump.

[0017] In summary, the present utility model has at least the following advantages:

[0018] The hydrogenation reaction device provided by the present utility model, by setting up a recycle hydrogen safety buffer tank, while realizing the recycling of hydrogen, maintains the relative stability of the gas pressure and gas flow of the compressor, which is beneficial to reducing the load change of the compressor caused by pressure and flow fluctuations and prolonging the service life of the compressor; at the same time, the setting of the recycle hydrogen safety buffer tank can also reduce the vibration of the compressor and the pipeline at the compressor inlet, avoiding adverse effects on other parts of the hydrogenation reaction device, thereby improving the overall safety performance of the hydrogenation reaction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the hydrogenation reaction device of Embodiment 1 of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the hydrogenation reaction device of Embodiment 2 of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the hydrogenation reaction device of Embodiment 3 of the present utility model.

[0022] Markings in the figure:

[0023] 1. Hydrogen delivery unit; 11. Fresh hydrogen supply tank; 12. Recycle hydrogen safety buffer tank; 13. Compressor; 14. Gas-liquid separation tank;

[0024] 2. Hydrogenation raw material delivery unit; 21. Raw material storage tank; 22. High-speed pump; 23. Oil-water separation tank;

[0025] 3. First-stage hydrogenation reactor;

[0026] 4. High-pressure flash tank; 41. First condenser; 42. Buffer tank;

[0027] 5. Second-stage hydrogenation feed pump;

[0028] 6. Low-pressure flash tank; 61. Second condenser;

[0029] 7. Product storage tank; 8. Circulation pump; 9. Circulation cooler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments of the present utility model.

[0031] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1

[0033] Reference Figure 1 , the hydrogenation reaction device provided in this embodiment includes a hydrogen delivery unit 1, a hydrogenation raw material delivery unit 2, a first-stage hydrogenation reactor 3, and a high-pressure flash tank 4. The high-pressure flash tank 4 is used to flash off hydrogen and a small amount of non-condensable gas to separate these gases from the hydrogenated material. A hydrogen input end and a raw material input end are provided at the lower end of the first-stage hydrogenation reactor 3, and an output end is provided at the upper end of the first-stage hydrogenation reactor 3. The hydrogen delivery unit 1 is connected to the hydrogen input end of the first-stage hydrogenation reactor 3, the hydrogenation raw material delivery unit 2 is connected to the raw material input end of the first-stage hydrogenation reactor 3, and the high-pressure flash tank 4 is connected to the output end of the first-stage hydrogenation reactor 3.

[0034] The hydrogen delivery unit 1 includes a fresh hydrogen supply tank 11, a recycle hydrogen safety buffer tank 12, and a compressor 13. The output ends of the fresh hydrogen supply tank 11 and the recycle hydrogen safety buffer tank 12 are both connected to the input end of the compressor 13, the output end of the compressor 13 is connected to the hydrogen input end of the first-stage hydrogenation reactor 3, and the input end of the recycle hydrogen safety buffer tank 12 is connected to the gas-phase output end of the high-pressure flash tank 4. It can be understood that the recycle hydrogen in the recycle hydrogen safety buffer tank 12 is sourced from the hydrogen flashed off in the high-pressure flash tank 4, thereby realizing the recycling of hydrogen.

[0035] It should be noted that the input end of the compressor 13 includes a fresh hydrogen input end and a recycle hydrogen input end. The compressor 13 internally includes a fresh hydrogen compression section and a recycle hydrogen compression section. The fresh hydrogen input end is correspondingly connected to the fresh hydrogen supply tank 11 and the fresh hydrogen compression section, and the recycle hydrogen input end is correspondingly connected to the recycle hydrogen safety buffer tank 12 and the recycle hydrogen compression section. Fresh hydrogen is delivered from the fresh hydrogen supply tank 11 to the fresh hydrogen compression section for compression, and the fresh hydrogen compression section raises the pressure to 4.3 MPaG. Recycle hydrogen is delivered from the recycle hydrogen safety buffer tank 12 to the recycle hydrogen compression section for compression, and the recycle hydrogen compression section raises the pressure to 4.3 MPaG. After the compressed fresh hydrogen and the compressed recycle hydrogen are mixed, they are delivered to the hydrogen input end of the first-stage hydrogenation reactor 3 through the output end of the compressor 13.

[0036] When the hydrogen gas flashed from the high-pressure flash drum 4 is transported to the recycle hydrogen safety buffer drum 12, the gas in the recycle hydrogen safety buffer drum 12 has a certain volume, which can absorb and relieve the change of gas pressure. When the gas pressure upstream fluctuates, the recycle hydrogen safety buffer drum 12 can act like a spring to absorb part of the pressure fluctuation, so as to keep the gas pressure entering the compressor 13 relatively stable. At the same time, the recycle hydrogen safety buffer drum 12 also has a certain gas storage capacity and can regulate the gas flow at the input end of the compressor 13. When the hydrogen gas supply upstream suddenly increases or decreases, the recycle hydrogen safety buffer drum 12 can temporarily store or release part of the gas to keep the gas flow entering the compressor 13 relatively stable, which is beneficial to reducing the load change of the compressor 13 caused by the flow fluctuation and prolonging the service life of the compressor 13. In addition, the recycle hydrogen safety buffer drum 12 can also absorb and relieve the vibration and pulse generated by the compressor 13, thereby reducing the vibration of the compressor 13 and the pipeline at the input end of the compressor 13 and avoiding adverse effects on other parts of the hydrogenation reaction device. By setting the recycle hydrogen safety buffer drum 12, the overall safety performance of the hydrogenation reaction device is effectively improved.

[0037] The top of the high-pressure flash drum 4 is provided with a gas-phase output end, and the bottom of the high-pressure flash drum 4 is provided with a liquid-phase output end. The hydrogen gas flashed from the high-pressure flash drum 4 is output through the gas-phase output end of the high-pressure flash drum 4, and the hydrogenated material is output through the liquid-phase output end of the high-pressure flash drum 4. As a further optimization, the gas-phase output end of the high-pressure flash drum 4 is connected to a first condenser 41. The liquid-phase output end of the first condenser 41 is communicated with the high-pressure flash drum 4, and the gas-phase output end of the first condenser 41 is communicated with the recycle hydrogen safety buffer drum 12.

[0038] It can be understood that the hydrogen gas flashed from the high-pressure flash drum 4 enters the first condenser 41 through the gas-phase output end of the high-pressure flash drum 4 for condensation and liquefaction. Under the action of gravity, the liquid obtained by condensation and liquefaction is transported back to the high-pressure flash drum 4 through the liquid-phase output end of the first condenser 41 for further flashing, while the non-condensable gases such as hydrogen gas are transported to the recycle hydrogen safety buffer drum 12 through the gas-phase output end of the first condenser 41 for reuse. In some embodiments, the hydrogen gas output through the gas-phase output end of the first condenser 41 can be divided into two paths. One path is transported to the recycle hydrogen safety buffer drum 12 for reuse, and the other path is transported to the second-stage hydrogenation reaction system as supplementary hydrogen. By condensing and liquefying the flashed hydrogen gas through the first condenser 41 and then re-introducing it back into the high-pressure flash drum 4 for further flashing, the yield of the hydrogenated material can be increased, thereby improving the production efficiency.

[0039] As a further optimization, the liquid-phase output end of the first condenser 41 is also connected to a buffer tank 42. The liquid-phase output end of the buffer tank 42 communicates with the high-pressure flash tank 4, and the gas-phase output end of the buffer tank 42 communicates with the recycle hydrogen safety buffer tank 12. It should be noted that the liquid output from the liquid-phase output end of the first condenser 41 is divided into two streams. One stream is directly transported into the high-pressure flash tank 4, and the other stream first enters the buffer tank 42 and then flows out from the liquid-phase output end at the bottom of the buffer tank 42 and is transported into the high-pressure flash tank 4. The gases such as hydrogen existing in the buffer tank 42 are transported into the recycle hydrogen safety buffer tank 12 through the gas-phase output end at the top of the buffer tank 42 for recycle utilization.

[0040] On the one hand, the buffer tank 42 enables the liquid condensed and liquefied by the first condenser 41 to achieve the separation of oil and water through natural stratification; on the other hand, the buffer tank 42 can play a buffering role, stabilizing the pressure and flow rate of the high-pressure flash tank 4, thereby further improving the overall safety of the hydrogenation reaction device. Since the gas pressure in the high-pressure flash tank 4 is relatively high, abnormal fluctuations are likely to cause safety accidents, and the setting of the buffer tank 42 can avoid safety problems. For example, when the pressure in the high-pressure flash tank 4 is too high, the buffer tank 42 can absorb and relieve the pressure change, thereby reducing the pressure fluctuation and maintaining the relative stability of the pressure in the high-pressure flash tank 4.

[0041] In some embodiments, a gas-liquid separation tank 14 is also connected between the fresh hydrogen supply tank 11 and the compressor 13. The gas-liquid separation tank 14 can remove the liquid entrained in the fresh hydrogen, thereby improving the purity of the fresh hydrogen entering the compressor 13, which is beneficial to improving the efficiency and quality of the hydrogenation reaction.

[0042] In this embodiment, the liquid-phase output end of the high-pressure flash tank 4 is connected to a second-stage hydrogenation feed pump 5. The second-stage hydrogenation feed pump 5 presses the hydrogenated material into the second-stage hydrogenation reaction system for the second-stage hydrogenation reaction. In some embodiments, the second-stage hydrogenation feed pump 5 can press the hydrogenated material into the second-stage inlet and outlet heat exchanger to exchange heat with the material after the second-stage hydrogenation reaction, thereby saving the energy consumption of the hydrogenation reaction device and reducing the production cost.

[0043] The hydrogenation reaction device of this embodiment, by setting the recycle hydrogen safety buffer tank, while realizing the recycle utilization of hydrogen, maintains the relative stability of the gas pressure and gas flow rate of the compressor, and at the same time can also reduce the adverse effects caused by excessive vibration of the compressor and the pipeline at the input end of the compressor on other parts of the device, improving the safety performance of the hydrogenation reaction device; by setting the first condenser, the yield of the hydrogenation material is increased, improving the production efficiency; by setting the buffer tank, both the liquid-oil separation of the condensed liquid is realized, and the pressure and flow rate of the high-pressure flash tank 4 can be stabilized, further improving the safety of the hydrogenation reaction device; by setting the gas-liquid separation tank, the purity of the fresh hydrogen is increased, thereby improving the efficiency and quality of the hydrogenation reaction.

[0044] Example 2

[0045] As a further optimization of Example 1, referring to Figure 2 , the hydrogenation reaction device further includes a low-pressure flash tank 6. The top of the low-pressure flash tank 6 is provided with a gas-phase output end, and the bottom of the low-pressure flash tank 6 is provided with a liquid-phase output end. The liquid-phase output end of the high-pressure flash tank 4 is connected to the low-pressure flash tank 6, and the liquid-phase output end of the low-pressure flash tank 6 is connected to the product storage tank 7. In some embodiments, a cooler for cooling the hydrogenated material is further connected between the liquid-phase output end of the high-pressure flash tank 4 and the low-pressure flash tank 6. After being cooled by the cooler, the hydrogenated material is depressurized to 0.5 MPaG and then enters the low-pressure flash tank 6 for low-pressure flashing.

[0046] As a further optimization, the gas-phase output end of the low-pressure flash tank 6 is connected to a second condenser 61. The liquid-phase output end of the second condenser 61 is connected to the low-pressure flash tank 6, and the gas-phase output end of the second condenser 61 is connected to the flare system. It can be understood that the hydrogenated material flowing out from the liquid-phase output end of the high-pressure flash tank 4 is divided into two paths. One path is pumped into the second-stage hydrogenation reaction system through the second-stage hydrogenation feed pump 5 for second-stage hydrogenation reaction, and the other path enters the low-pressure flash tank 6 after being cooled by the cooler for low-pressure flashing. The flashed mixture of a small amount of light hydrocarbons and hydrogen gas enters the second condenser 61 through the gas-phase output end of the low-pressure flash tank 6 for condensation and liquefaction. The liquefied liquid flows back into the low-pressure flash tank 6 under the action of gravity for re-flashing. The non-condensable gas in the second condenser 61 is discharged to the flare system through the gas-phase output end of the second condenser for subsequent treatment. The hydrogenated material after low-pressure flashing is then transported to the product storage tank 7 through the liquid-phase output end of the low-pressure flash tank 6 for storage.

[0047] Example 3

[0048] As a further optimization of Example 2, referring to Figure 3 , the liquid-phase output end of the high-pressure flash tank 4 is connected to a circulation pump 8. The output end of the circulation pump 8 is connected to a circulation cooler 9. The output end of the circulation cooler 9 is connected to the raw material input end of the first-stage hydrogenation reactor 3. The hydrogenation raw material delivery unit 2 includes a raw material storage tank 21 and a high-speed pump 22 connected in sequence. The material in the raw material storage tank 21 comes from the deweighting tower, and the output end of the high-speed pump 22 is connected to the raw material input end of the first-stage hydrogenation reactor 3. In some embodiments, the output end of the circulation cooler 9 and the output end of the high-speed pump 22 are commonly connected to a feed mixer, and the output end of the feed mixer is connected to the raw material input end of the first-stage hydrogenation reactor 3.

[0049] It is understandable that the hydrogenated material flowing out from the liquid-phase output end of the high-pressure flash tank 4 is divided into three paths. The first path is pressurized by the second-stage hydrogenation feed pump 5 and fed into the second-stage hydrogenation reaction system for the second-stage hydrogenation reaction; the second path enters the low-pressure flash tank 6 for low-pressure flashing and is stored in the product storage tank 7; the third path is pressurized by the circulation pump 8 and fed into the circulation cooler 9 for cooling, and then enters the feed mixer. The material in the raw material storage tank 21 is pressurized to 5.0 MPaG by the high-speed pump 22 and then enters the feed mixer, where it is fully mixed with the hydrogenated material from the previous round, and then enters the first-stage hydrogenation reactor 3 for the first-stage hydrogenation reaction.

[0050] As a further optimization, an oil-water separation tank 23 is also connected between the raw material storage tank 21 and the high-speed pump 22. The oil-water separation tank 23 is used to remove the residual free water in the material. This can improve the purity and quality of the raw material, which is beneficial to improving the efficiency and quality of the hydrogenation reaction. Through the connection pipeline between the circulation pump 8 and the circulation cooler 9, the hydrogenated material can be subjected to another hydrogenation reaction, which is beneficial to improving the sufficiency of the hydrogenation reaction and maximizing the quality and value of the hydrogenation product.

[0051] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model 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, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0053] In the present utility model, unless otherwise clearly defined and limited, the first feature being above or below the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being above, over, and on top of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0054] Although the description of the present utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications, and variations based on the above content. Therefore, all such substitutions, improvements, and variations are included within the spirit and scope of the appended claims.

Claims

1. A hydrogenation reaction device, characterized in that: The invention comprises a hydrogen delivery unit (1), a hydrogenation raw material delivery unit (2), a first stage hydrogenation reactor (3) and a high-pressure flash tank (4), wherein the hydrogen delivery unit (1) is connected to the hydrogen input end of the first stage hydrogenation reactor (3), the hydrogenation raw material delivery unit (2) is connected to the raw material input end of the first stage hydrogenation reactor (3), and the high-pressure flash tank (4) is connected to the output end of the first stage hydrogenation reactor (3); The hydrogen delivery unit (1) comprises a fresh hydrogen supply tank (11), a circulating hydrogen safety buffer tank (12) and a compressor (13); the output ends of the fresh hydrogen supply tank (11) and the circulating hydrogen safety buffer tank (12) are both connected to the input end of the compressor (13); the output end of the compressor (13) is connected to the hydrogen input end of the first stage hydrogenation reactor (3); and the input end of the circulating hydrogen safety buffer tank (12) is connected to the gas phase output end of the high-pressure flash tank (4).

2. The hydrogenation reaction device according to claim 1, characterized in that: The gas phase output end of the high-pressure flash tank (4) is connected to a first condenser (41), the liquid phase output end of the first condenser (41) is in communication with the high-pressure flash tank (4), and the gas phase output end of the first condenser (41) is in communication with the circulating hydrogen safety buffer tank (12).

3. The hydrogenation reaction device according to claim 2, characterized in that: The liquid phase output end of the first condenser (41) is also connected to a buffer tank (42), the liquid phase output end of the buffer tank (42) is connected to the high-pressure flash tank (4), and the gas phase output end of the buffer tank (42) is connected to the circulating hydrogen safety buffer tank (12).

4. The hydrogenation reaction device according to claim 1, characterized in that: A gas-liquid separation tank (14) is also connected between the fresh hydrogen supply tank (11) and the compressor (13).

5. The hydrogenation reaction device according to claim 1, characterized in that: The liquid phase output end of the high-pressure flash tank (4) is connected to a second-stage hydrogenation feed pump (5).

6. The hydrogenation reaction device according to claim 5, characterized in that: The liquid phase output end of the high-pressure flash tank (4) is connected to the low-pressure flash tank (6), and the liquid phase output end of the low-pressure flash tank (6) is connected to the product storage tank (7).

7. The hydrogenation reaction device according to claim 6, characterized in that: The gas phase output end of the low-pressure flash tank (6) is connected to a second condenser (61), the liquid phase output end of the second condenser (61) is connected to the low-pressure flash tank (6), and the gas phase output end of the second condenser (61) is connected to a flare system.

8. The hydrogenation reaction device according to claim 1, characterized in that: The liquid phase output end of the high-pressure flash tank (4) is connected to a circulation pump (8), the output end of the circulation pump (8) is connected to a circulation cooler (9), and the output end of the circulation cooler (9) is connected to the raw material input end of the first-stage hydrogenation reactor (3).

9. The hydrogenation reaction device according to claim 1, characterized in that: The hydrogenation raw material delivery unit (2) comprises a raw material storage tank (21) and a high-speed pump (22) which are connected in sequence, and the output end of the high-speed pump (22) is connected to the raw material input end of the first-stage hydrogenation reactor (3).

10. The hydrogenation reaction device according to claim 9, characterized in that: An oil-water separation tank (23) is also connected between the raw material storage tank (21) and the high-speed pump (22).

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