Corrosion-resistant vacuum stripping apparatus

Abstract

The utility model relates to petroleum chemical production device technical field discloses a kind of corrosion-resistant vacuum stripping device, including vacuum stripping tower and liquid ammonia storage tank, the top of the vacuum stripping tower is connected with condenser;The upper end of the vacuum stripping tower is provided with raw material input port, the lower end of the vacuum stripping tower is provided with ammonia gas input port, the ammonia gas input port is communicated with the liquid ammonia storage tank, and the liquid ammonia storage tank is provided with pressure-reducing gasification component between the ammonia gas input port.The utility model plays the following technical effects: by setting ammonia gas input port in the lower end of vacuum stripping tower and making ammonia gas input port communicate with liquid ammonia storage tank, liquid ammonia in liquid ammonia storage tank can become ammonia gas after pressure-reducing gasification of pressure-reducing gasification component and neutralization reaction with feed material in vacuum stripping tower, thereby reducing the generation of acidic substance, effectively solve the corrosion problem of vacuum stripping tower internal component, tower outer condenser and auxiliary pipeline.

Description

Technical Field

[0001] This utility model belongs to the technical field of petrochemical production equipment, specifically relating to a corrosion-resistant vacuum stripping device. Background Technology

[0002] Vacuum stripping units are common petrochemical production equipment, primarily used to separate certain components from liquid materials. Their separation principle mainly utilizes the vaporization characteristics of different components at different temperatures. For example, in the production of C5 petroleum resin, the C5 petroleum resin containing oligomers enters the vacuum stripping tower from the upper middle section. It then comes into counter-current contact with stripping steam entering from the lower middle section of the tower. Ultimately, the heavier C5 petroleum resin is collected from the bottom of the tower, while the lighter oligomers are discharged from the top of the tower with the stripping steam and condensed in a condenser before entering a buffer tank. Non-condensable gases in the condenser are removed by a vacuum system.

[0003] In existing technologies, because the material components entering the vacuum stripping tower contain chloride ions, the chloride ions will enter the condenser along with the stripping steam and be condensed to form acidic substances, thereby corroding the condenser and its auxiliary pipes at the top of the vacuum stripping tower. At the same time, due to the special properties of the material, some chloride ions will also be incorporated into the separated heavy components, causing the internal components of the vacuum stripping tower to be corroded as well, seriously affecting the normal operation and service life of the vacuum stripping device. Utility Model Content

[0004] To address the shortcomings of the existing technology, this invention provides a corrosion-resistant vacuum stripping device. By setting an ammonia input port at the lower end of the vacuum stripping tower and connecting the ammonia input port to a liquid ammonia storage tank, the liquid ammonia in the storage tank can be converted into ammonia gas after being depressurized and vaporized by the depressurization vaporization component. This ammonia gas then undergoes a neutralization reaction with the feed material in the vacuum stripping tower, thereby reducing the generation of acidic substances and effectively solving the corrosion problems of the internal components of the vacuum stripping tower, the external condenser, and the auxiliary pipelines.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a corrosion-resistant vacuum stripping device, including a vacuum stripping tower and a liquid ammonia storage tank, wherein a condenser is connected to the top of the vacuum stripping tower. The upper end of the vacuum stripping tower is provided with a raw material input port, and the lower end of the vacuum stripping tower is provided with an ammonia input port. The ammonia input port is connected to the liquid ammonia storage tank, and a pressure reducing vaporization component is provided between the liquid ammonia storage tank and the ammonia input port.

[0006] As a further description of the technical solution of this utility model, the pressure reducing and vaporizing component includes a primary pressure reducing valve and a secondary pressure reducing valve, wherein the secondary pressure reducing valve is located between the primary pressure reducing valve and the ammonia input port.

[0007] As a further description of the technical solution of this utility model, a flow control valve is also provided between the pressure reducing vaporization component and the ammonia input port. The flow control valve is used to regulate and control the flow rate of ammonia entering the vacuum stripping tower.

[0008] As a further description of the technical solution of this utility model, the lower end of the vacuum stripping tower is also provided with a waste liquid output port, which is located below the ammonia input port and is connected to an external sewage treatment system.

[0009] As a further description of the technical solution of this utility model, the top of the condenser is provided with a non-condensable gas discharge port, which is connected to a vacuum pump, and the bottom of the condenser is provided with a condensate discharge port, which is connected to a buffer tank.

[0010] As a further description of the technical solution of this utility model, a backup condenser is also connected to the top of the vacuum stripping tower, and the backup condenser is connected in series or in parallel with the condenser.

[0011] As a further description of the technical solution of this utility model, the lower end of the vacuum stripping tower is also provided with a steam input port, which is located above the ammonia input port and is connected to the steam supply system.

[0012] As a further description of the technical solution of this utility model, the vacuum stripping tower is provided with a material distributor and a packing layer inside. The material distributor is located above the packing layer, and both the material distributor and the packing layer are located between the raw material input port and the steam input port.

[0013] As a further description of the technical solution of this utility model, the filler layer is a plate corrugated filler layer.

[0014] As a further description of the technical solution of this utility model, the corrosion-resistant vacuum stripping device also includes a raw material storage tank and a product storage tank. The raw material storage tank is connected to the raw material input port, and the product storage tank is connected to the bottom of the vacuum stripping tower.

[0015] In summary, this utility model has at least the following advantages: The corrosion-resistant vacuum stripping device provided by this utility model has an ammonia inlet port at the lower end of the vacuum stripping tower, which is connected to a liquid ammonia storage tank. When the vacuum stripping device is running, the liquid ammonia in the storage tank is vaporized by the pressure-reducing vaporization component and becomes gaseous ammonia gas, which enters the vacuum stripping tower through the ammonia inlet port. The material to be separated enters the vacuum stripping tower from the raw material inlet port. The ammonia gas can come into countercurrent contact with the material to be separated and react with the chloride ions in the material, thereby reducing the chloride ion content in the material and effectively neutralizing the acidic substances in the material. This reduces the corrosion rate of the internal components, external condenser and auxiliary pipelines of the vacuum stripping tower, ensuring the normal and stable operation of the vacuum stripping device, and also helps to extend the service life of the vacuum stripping device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the corrosion-resistant vacuum stripping device according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the corrosion-resistant vacuum stripping device according to Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the corrosion-resistant vacuum stripping device according to Embodiment 3 of this utility model; Figure 4 This is a schematic diagram of the vacuum stripping tower of Embodiment 3 of this utility model.

[0017] Marked in the image: 1. Vacuum stripping tower; 11. Raw material input port; 12. Ammonia input port; 13. Flow control valve; 14. Waste liquid output port; 15. Steam input port; 16. Material distributor; 17. Packing layer; 2. Liquid ammonia storage tank; 3. Condenser; 31. Non-condensable gas vent; 32. Condensate vent; 4. Pressure reducing vaporization assembly; 41. Primary pressure reducing valve; 42. Secondary pressure reducing valve; 5. Vacuum pump; 6. Buffer tank; 7. Backup condenser; 8. Raw material storage tank; 9. Product storage tank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0019] Therefore, 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Example 1 refer to Figure 1 The corrosion-resistant vacuum stripping device provided in this embodiment includes a vacuum stripping tower 1 and a liquid ammonia storage tank 2. A condenser 3 is connected to the top of the vacuum stripping tower 1.

[0021] The upper end of the vacuum stripping tower 1 is provided with a raw material input port 11, and the lower end of the vacuum stripping tower 1 is provided with an ammonia input port 12. The ammonia input port 12 is connected to the liquid ammonia storage tank 2, and a pressure reducing vaporization component 4 is provided between the liquid ammonia storage tank 2 and the ammonia input port 12. The pressure reducing vaporization component 4 is used to reduce the pressure of the liquid ammonia output from the liquid ammonia storage tank 2, so that the liquid ammonia is converted into gaseous ammonia.

[0022] Understandably, during the operation of the vacuum stripping unit, the liquid ammonia in the liquid ammonia storage tank 2 is converted into gaseous ammonia gas after being depressurized and vaporized by the depressurization and vaporization component 4. Then, it enters the vacuum stripping tower 1 through the ammonia gas inlet port 12. The material to be separated (C5 petroleum resin containing oligomers) enters the vacuum stripping tower 1 from the raw material inlet port 11 and flows downward, while the ammonia gas entering the vacuum stripping tower 1 diffuses upward. This allows the material to be separated and the ammonia gas to come into full countercurrent contact. The ammonia gas can react with the chloride ions carried by the material to be separated, reducing the chloride ion content in the material and effectively neutralizing the acidic substances in the material. This reduces the corrosion rate of the internal components of the vacuum stripping tower 1, the external condenser 3, and its auxiliary pipelines, ensuring the normal and stable operation of the vacuum stripping unit and extending its service life.

[0023] In one implementation, the pressure-reducing vaporization assembly 4 includes a primary pressure-reducing valve 41 and a secondary pressure-reducing valve 42, with the secondary valve 42 located between the primary valve 41 and the ammonia inlet port 12. The primary valve 41 is used for initial pressure reduction and undertakes the main pressure-reducing task, while the secondary valve 42 is used for precise pressure stabilization, eliminating pressure fluctuations and further improving pressure stability. Through the dual pressure-reducing action of the primary and secondary valves 41, the safety risks during operation can be effectively reduced, and the safety of the vacuum stripping unit can be improved.

[0024] As a further optimization, a flow control valve 13 is also provided between the pressure-reducing vaporization component 4 and the ammonia input port 12. The flow control valve 13 is used to regulate and control the flow rate of ammonia entering the vacuum stripping tower 1. In this embodiment, the flow control valve 13 can control the ammonia flow rate to approximately 1 kg / h. In some embodiments, the flow control valve 13 can be electrically connected to an external control module. By precisely regulating the ammonia flow rate through the control module, the supply of ammonia can be accurately controlled to achieve the best neutralization effect.

[0025] In some embodiments, a waste liquid output port 14 is also provided at the lower end of the vacuum stripping tower 1. The waste liquid output port 14 is located below the ammonia input port 12 and is connected to an external wastewater treatment system. It is understood that after the ammonia reacts with the chloride-containing material in the vacuum stripping tower 1, an ammonium chloride aqueous solution is generated. The ammonium chloride aqueous solution and the heavy component material (C5 petroleum resin) at the bottom of the vacuum stripping tower 1 can naturally separate under gravity, allowing the ammonium chloride aqueous solution to separate from the heavy component material. The upper layer of ammonium chloride aqueous solution can be discharged to the external wastewater treatment system through the waste liquid output port 14 for further treatment, while the lower layer of heavy component material can be output from the output port at the bottom of the vacuum stripping tower 1.

[0026] Example 2 As a further optimization of Example 1, in Figure 1 Based on, refer to Figure 2 The top of the condenser 3 is provided with a non-condensable gas discharge port 31, which is connected to a vacuum pump 5. The vacuum pump 5 is used to extract the non-condensable gas from the device. The bottom of the condenser 3 is provided with a condensate discharge port 32, which is connected to a buffer tank 6. The buffer tank 6 is used to buffer the condensate (containing oligomers).

[0027] In some embodiments, a standby condenser 7 is also connected to the top of the vacuum stripping tower 1. The standby condenser 7 is connected in series or in parallel with the condenser 3. In this embodiment, the standby condenser 7 is connected in parallel with the condenser 3. The non-condensable gas discharge port of the standby condenser 7 is connected to the vacuum pump 5, and the condensate discharge port of the standby condenser 7 is connected to the buffer tank 6. During the operation of the vacuum stripping unit, either the condenser 3 or the standby condenser 7 can be selectively started. The condenser 3 can be used as the main unit. When the condenser 3 fails and requires maintenance, the connection pipeline of the standby condenser 7 can be switched to continue the condensation operation. This ensures the continuity and stability of the vacuum stripping unit's operation and reduces unit wear.

[0028] Example 3 As a further optimization of Example 2, in Figures 1 to 2 Based on, refer to Figures 3 to 4The lower end of the vacuum stripping tower 1 is also provided with a steam input port 15, which is located above the ammonia input port 12 and is connected to the steam supply system.

[0029] The vacuum stripping tower 1 is internally equipped with a material distributor 16 and a packing layer 17. The material distributor 16 is located above the packing layer 17, and both the material distributor 16 and the packing layer 17 are situated between the raw material inlet port 11 and the steam inlet port 15. When the material to be separated enters the vacuum stripping tower 1 from the raw material inlet port 11, it first enters the material distributor 16. The material distributor 16 can evenly disperse the material and guide it downwards into the packing layer 17. The packing layer 17 can further improve the dispersion and uniformity of the material, allowing the material to fully contact the steam and ammonia, thereby enhancing the stripping effect.

[0030] In this embodiment, the packing layer 17 is a plate corrugated packing layer. The plate corrugated packing layer has high mass transfer performance, as well as strong mechanical strength and corrosion resistance. Using a plate corrugated packing layer as the packing layer 17 can not only improve the dispersion and uniformity of materials, but also prevent corrosion by acidic substances, which is beneficial to further extend the service life of the vacuum stripping device.

[0031] The corrosion-resistant vacuum stripping unit also includes a raw material storage tank 8 and a product storage tank 9. The raw material storage tank 8 is connected to the raw material input port 11, and the product storage tank 9 is connected to the bottom of the vacuum stripping tower 1. The raw material storage tank 8 is used to store the material to be separated (C5 petroleum resin containing oligomers), and the product storage tank 9 is used to store the separated heavy components (C5 petroleum resin).

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A corrosion-resistant vacuum stripping device, characterized in that, It includes a vacuum stripping tower (1) and a liquid ammonia storage tank (2), and a condenser (3) is connected to the top of the vacuum stripping tower (1). The upper end of the vacuum stripping tower (1) is provided with a raw material input port (11), and the lower end of the vacuum stripping tower (1) is provided with an ammonia input port (12). The ammonia input port (12) is connected to the liquid ammonia storage tank (2), and a pressure reducing vaporization component (4) is provided between the liquid ammonia storage tank (2) and the ammonia input port (12).

2. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, The pressure reducing vaporization component (4) includes a primary pressure reducing valve (41) and a secondary pressure reducing valve (42), wherein the secondary pressure reducing valve (42) is located between the primary pressure reducing valve (41) and the ammonia input port (12).

3. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, A flow control valve (13) is also provided between the pressure reducing vaporization component (4) and the ammonia input port (12). The flow control valve (13) is used to regulate and control the flow rate of ammonia entering the vacuum stripping tower (1).

4. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, The lower end of the vacuum stripping tower (1) is also provided with a waste liquid output port (14), which is located below the ammonia input port (12) and is connected to an external sewage treatment system.

5. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, The top of the condenser (3) is provided with a non-condensable gas discharge port (31), which is connected to a vacuum pump (5). The bottom of the condenser (3) is provided with a condensate discharge port (32), which is connected to a buffer tank (6).

6. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, The vacuum stripping tower (1) is also connected to a standby condenser (7) at the top of the tower, and the standby condenser (7) is connected in series or in parallel with the condenser (3).

7. The corrosion-resistant vacuum stripping device according to claim 1, characterized in that, The lower end of the vacuum stripping tower (1) is also provided with a steam input port (15), which is located above the ammonia input port (12) and is connected to the steam supply system.

8. The corrosion-resistant vacuum stripping apparatus according to claim 7, characterized in that, The vacuum stripping tower (1) is equipped with a material distributor (16) and a packing layer (17). The material distributor (16) is located above the packing layer (17), and both the material distributor (16) and the packing layer (17) are located between the raw material input port (11) and the steam input port (15).

9. The corrosion-resistant vacuum stripping apparatus according to claim 8, characterized in that, The packing layer (17) is a plate corrugated packing layer.

10. The corrosion-resistant vacuum stripping apparatus according to claim 1, characterized in that, It also includes a raw material storage tank (8) and a product storage tank (9), wherein the raw material storage tank (8) is connected to the raw material input port (11), and the product storage tank (9) is connected to the bottom of the vacuum stripping tower (1).

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