Vacuum stripping gas phase product treatment apparatus

Abstract

The utility model relates to petroleum chemical production device technical field discloses a kind of vacuum stripping gas phase product processing device, including first condenser, second condenser, gas phase condensation receiving jar, vacuum buffer tank, water ring vacuum pump and gas-liquid separation tank, and the top of first condenser is connected with the column top of vacuum stripping tower;The top of gas phase condensation receiving jar is provided with first input port and first output port, and the condensate discharge port of first condenser is communicated with first input port, and first output port is communicated with the input port of second condenser, and the non-condensable gas discharge port of first condenser is communicated with the input port of second condenser, and the non-condensable gas discharge port of second condenser is communicated with vacuum buffer tank, and water ring vacuum pump and gas-liquid separation tank are sequentially connected in the downstream of vacuum buffer tank.The utility model has the following technical effects: using water ring vacuum pump as vacuumizing power facility, the content of ammonia salt in gas phase can be reduced, thereby reducing device failure rate and maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of petrochemical production equipment, specifically relating to a vacuum stripping gas phase product processing device. Background Technology

[0002] Vacuum stripping towers are a common type of petrochemical production equipment. They utilize the vaporization characteristics of different components at different temperatures to separate certain components from a material. For example, after stripping C5 petroleum resin containing oligomers in a vacuum stripping tower, a gaseous product containing oligomers can be separated. This gaseous product is discharged from the top of the tower and enters a condenser at the top for condensation. The resulting liquid is discharged, while the non-condensable gaseous phase is extracted to the flare system via a vacuum system.

[0003] However, in existing technologies, the gaseous products produced by vacuum stripping towers contain ammonia salts. During continuous production operation, these ammonia salts can clog the vacuum pumps in the vacuum system, leading to unstable vacuum fluctuations, affecting the normal operation of the production unit, and increasing the failure rate. Furthermore, the gaseous phase may also contain small amounts of liquid, further increasing the risk of vacuum pump damage and maintenance costs. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a vacuum stripping gas phase product processing device. By employing a water ring vacuum pump as the vacuum pumping power facility, the working fluid in the vacuum pump can absorb ammonium salts in the gas phase, thereby reducing the content of ammonium salts in the gas phase, avoiding any impact on the operation of the vacuum pump, and effectively reducing the failure rate of the device. At the same time, the liquid entrained in the gas phase is less likely to have an adverse effect on the water ring vacuum pump, which helps to reduce maintenance costs.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a vacuum stripping gas phase product processing device for connection to the top of a vacuum stripping tower, including a first condenser, a second condenser, a gas phase condensation receiving tank, a vacuum buffer tank, a water ring vacuum pump, and a gas-liquid separation tank, wherein the first condenser is connected to the top of the vacuum stripping tower. The top of the gas phase condenser is provided with a first input port and a first output port. The condensate discharge port of the first condenser is connected to the first input port, the first output port is connected to the input port of the second condenser, the non-condensable gas discharge port of the first condenser is connected to the input port of the second condenser, the non-condensable gas discharge port of the second condenser is connected to the vacuum buffer tank, and the water ring vacuum pump and the gas-liquid separator are sequentially connected downstream of the vacuum buffer tank.

[0006] As a further description of the technical solution of this utility model, a partition is vertically installed inside the gas phase condenser receiving tank. The first input port is connected to a first pipe, and the first output port is connected to a second pipe. The first pipe and the second pipe are respectively located on both sides of the partition. A liquid injection space is formed between the side wall of the partition near the first pipe and the inner wall of the gas phase condenser receiving tank. The lower end of the first pipe is located in the liquid injection space.

[0007] As a further description of the technical solution of this utility model, the height of the bottom end of the first pipe and the height of the bottom end of the second pipe are both lower than the height of the top end of the partition, and the height of the bottom end of the first pipe is lower than the height of the bottom end of the second pipe.

[0008] As a further description of the technical solution of this utility model, the bottom of the gas phase condenser receiving tank is provided with a second input port corresponding to the position of the liquid injection space, and the condensate discharge port of the second condenser is connected to the second input port.

[0009] As a further description of the technical solution of this utility model, the bottom of the gas phase condenser receiving tank is provided with a second output port corresponding to the position of the liquid injection space, and the second output port is connected to a first drain pump.

[0010] As a further description of the technical solution of this utility model, the vacuum stripping gas phase product processing device also includes a backup condenser, which is connected in parallel with the first condenser. The condensate discharge port of the backup condenser is connected to the first input port, and the non-condensable gas discharge port of the backup condenser is connected to the input port of the second condenser.

[0011] As a further description of the technical solution of this utility model, the top of the gas-liquid separator is provided with a gas discharge port, and the lower end of the gas-liquid separator is provided with a liquid output port, which is connected to the liquid replenishment port of the water ring vacuum pump.

[0012] As a further description of the technical solution of this utility model, a heat exchanger is also provided between the liquid output port and the liquid replenishment port of the water ring vacuum pump.

[0013] As a further description of the technical solution of this utility model, the upper end of the gas-liquid separator is also provided with a fresh water supply port, and the lower end of the gas-liquid separator is also provided with a wastewater discharge port.

[0014] As a further description of the technical solution of this utility model, the wastewater discharge port is connected to a second drainage pump, which is connected to an external sewage treatment system.

[0015] In summary, this utility model has at least the following advantages: The vacuum stripping gas phase product processing device provided by this utility model uses a water ring vacuum pump as the vacuum pumping power source. The liquid water in the vacuum pump can contact the non-condensable gas phase, causing the ammonium salts in the gas phase to dissolve in the water. This effectively reduces the ammonium salt content in the gas phase, preventing vacuum fluctuations caused by ammonium salts, thus effectively reducing the device's failure rate and improving operational stability. Since the water ring vacuum pump itself requires liquid water to operate, even if the gas phase entering the water ring vacuum pump contains a small amount of liquid, it will not adversely affect the pump, helping to reduce maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the vacuum stripping gas phase product processing device according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of the gas phase condenser receiving tank in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the vacuum stripping gas phase product processing device according to Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the vacuum stripping gas phase product processing device according to Embodiment 3 of this utility model.

[0017] Marked in the image: 100. Vacuum stripping tower; 1. First condenser; 2. Second condenser; 3. Vapor phase condenser; 31. First input port; 32. First output port; 33. Baffle; 34. First pipe; 35. Second pipe; 36. Liquid injection space; 37. Second input port; 38. Second output port; 4. Vacuum buffer tank; 5. Water ring vacuum pump; 6. Gas-liquid separator; 61. Gas exhaust port; 62. Liquid output port; 63. Fresh water supply port; 64. Wastewater discharge port; 7. First drain pump; 8. Standby condenser; 9. Heat exchanger; 10. Second drain pump. 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 Figures 1 to 2 The vacuum stripping gas phase product processing device provided in this embodiment is used to connect to the top of the vacuum stripping tower 100. It includes a first condenser 1, a second condenser 2, a gas phase condensation receiving tank 3, a vacuum buffer tank 4, a water ring vacuum pump 5, and a gas-liquid separator 6. The first condenser 1 is connected to the top of the vacuum stripping tower 100.

[0021] The top of the gas phase condenser tank 3 is provided with a first input port 31 and a first output port 32. The condensate discharge port of the first condenser 1 is connected to the first input port 31, the first output port 32 is connected to the input port of the second condenser 2, the non-condensable gas discharge port of the first condenser 1 is connected to the input port of the second condenser 2, the non-condensable gas discharge port of the second condenser 2 is connected to the vacuum buffer tank 4, and the water ring vacuum pump 5 and the gas-liquid separator 6 are connected downstream of the vacuum buffer tank 4 in sequence.

[0022] The gaseous product containing ammonia salts in the vacuum stripping tower 100 enters the first condenser 1 for condensation at the top of the tower. The liquid phase generated during condensation, carrying a small amount of gas phase, enters the gas phase condensation receiving tank 3 through the first input port 31. The liquid phase then remains in the gas phase condensation receiving tank 3, while the small amount of gas phase is discharged through the first output port 32 and enters the second condenser 2 for further condensation. The non-condensable gas generated in the first condenser 1 also enters the second condenser 2 for further condensation. The non-condensable gas generated in the second condenser 2 then enters the vacuum buffer tank 4 and is drawn by the water ring vacuum pump 5 to the gas-liquid separator 6. The material entering the gas-liquid separator 6 is a gas-liquid mixture. The gas-liquid separator 6 can fully separate the gas phase and liquid phase in the gas-liquid mixture. The gas phase can then be discharged to the flare system, and the liquid phase can be discharged to the wastewater treatment system.

[0023] Understandably, during operation, the liquid water inside the water ring vacuum pump 5 can come into contact with non-condensable gases, causing the ammonium salts in the gas phase to dissolve in the water. This reduces the ammonium salt content in the gas phase, preventing the presence of ammonium salts from affecting the vacuum level of the pump, effectively reducing the failure rate of the device and improving its operational stability. Furthermore, since the water ring vacuum pump 5 requires liquid water as its working fluid, even if the gas phase entering the pump contains a small amount of liquid, it will not adversely affect the pump, thus reducing maintenance costs.

[0024] In some embodiments, a partition 33 is vertically installed inside the vapor phase condenser tank 3. A first input port 31 is connected to a first pipe 34, and a first output port 32 is connected to a second pipe 35. The first pipe 34 and the second pipe 35 are located on both sides of the partition 33. A liquid injection space 36 is formed between the side wall of the partition 33 near the first pipe 34 and the inner wall of the vapor phase condenser tank 3. The liquid injection space 36 is used to hold liquid water. The lower end of the first pipe 34 is located in the liquid injection space 36 and extends into the liquid water.

[0025] Understandably, the side of the partition 33 closest to the first pipe 34 contains liquid water, while the side of the partition 33 closest to the second pipe 35 does not contain liquid water. The gas-liquid mixture input from the first input port 31 enters the injection space 36 through the first pipe 34. The liquid phase substance in the gas-liquid mixture merges with the liquid water and remains in the injection space 36. After the gas phase substance comes into contact with the liquid water, the ammonium salt in the gas phase dissolves in the liquid water. The gas phase substance rises above the injection space 36 and passes over the partition 33, and finally is discharged from the first output port 32 through the second pipe 35. By installing a baffle 33 inside the vapor phase condenser tank 3 and extending the first pipe 34 into the liquid water in the injection space 36, the vapor phase entering the vapor phase condenser tank 3 can be liquid-sealed. The liquid water in the injection space 36 can dissolve and absorb the ammonia salts in the vapor phase, effectively reducing the ammonia salt content in the vapor phase and reducing the impact of ammonia salts on subsequent production facilities. At the same time, the presence of the baffle 33 can also prevent the liquid in the vapor phase condenser tank 3 from being discharged from the first output port 32 along with the vapor phase, which is beneficial to ensuring the normal operation of the device.

[0026] As a further optimization, the height of the bottom end of the first pipe 34 and the bottom end of the second pipe 35 are both lower than the height of the top end of the baffle 33, and the height of the bottom end of the first pipe 34 is lower than the height of the bottom end of the second pipe 35. This forces the gas phase escaping the injection space 36 to cross the baffle 33 to enter the second pipe 35, while the liquid within the injection space 36 cannot cross the baffle 33, thus ensuring that the liquid does not follow the gas phase into the second pipe 35.

[0027] Example 2 As a further optimization of Example 1, in Figures 1 to 2 Based on, refer to Figure 3The bottom of the vapor phase condenser 3 is equipped with a second input port 37 corresponding to the position of the liquid injection space 36. The condensate discharge port of the second condenser 2 is connected to the second input port 37. The liquid phase generated in the second condenser 2 carries a small amount of gas phase and is discharged from the condensate discharge port of the second condenser 2 into the liquid injection space 36 in the vapor phase condenser 3. The liquid phase merges with the liquid in the liquid injection space 36 and remains in the liquid injection space 36, while the gas phase leaves the liquid injection space 36 and is discharged again through the second pipe 35 and the first output port 32. Thus, the liquid phase discharged from the second condenser 2 can be replenished to the liquid injection space 36 for the dissolution and absorption of ammonia salts, while the gas phase carried in the liquid phase can return to the second condenser 2 through the first output port 32 for condensation. This achieves both full utilization of production resources and thorough condensation treatment of the vacuum stripping gas phase products.

[0028] In some embodiments, a second output port 38 is provided at the bottom of the vapor phase condenser tank 3, corresponding to the position of the liquid injection space 36. The second output port 38 is connected to a first drain pump 7. During the operation of the device, when there is too much liquid in the liquid injection space 36, the excess liquid can be discharged through the second output port 38 and the first drain pump 7. The first drain pump 7 can be connected to an external wastewater treatment system or to other production systems, so that the liquid discharged from the vapor phase condenser tank 3 can be used as production water for other production systems, thereby making full use of production resources and reducing production costs.

[0029] In some embodiments, the vacuum stripping gaseous product processing device further includes a backup condenser 8, which is connected in parallel with the first condenser 1. The condensate discharge port of the backup condenser 8 is connected to the first input port 31, and the non-condensable gas discharge port of the backup condenser 8 is connected to the input port of the second condenser 2. When the first condenser 1 malfunctions and requires maintenance, the connection pipeline of the backup condenser 8 can be switched to continue the condensation of the vacuum stripping gaseous product, thereby achieving continuity of the production process.

[0030] Example 3 As a further optimization of Example 2, in Figures 1 to 3 Based on, refer to Figure 4 The gas-liquid separator 6 has a gas discharge port 61 at its top, which can be connected to a flare system. The lower end of the gas-liquid separator 6 has a liquid output port 62, which connects to the replenishment port of the water ring vacuum pump 5. The liquid in the gas-liquid separator 6 can be used as the working fluid for the water ring vacuum pump 5, eliminating the need for fresh water replenishment and allowing for full utilization of production resources, thus reducing the operating costs of the equipment.

[0031] It should be noted that in this embodiment, the gas-liquid separator 6 initially contains water. After the gas-liquid mixture output by the water ring vacuum pump 5 enters the gas-liquid separator 6, the liquid phase mixes with the water in the gas-liquid separator 6, while residual ammonia salts in the gas phase dissolve in the water. Through the separation action of the gas-liquid separator 6, the gas phase and liquid phase are fully separated, and the gas phase is discharged to the flare system through the gas emission port 61. Through the separation action of the gas-liquid separator 6, not only can the gas phase and liquid phase be fully separated, but residual ammonia salts in the gas phase can also be eliminated again, so that the gas discharged to the flare system is basically free of ammonia salts, which can further prevent the presence of ammonia salts in the gas from causing adverse effects on the flare system.

[0032] In some embodiments, a heat exchanger 9 is also provided between the liquid output port 62 and the liquid replenishment port of the water ring vacuum pump 5. The liquid output from the liquid output port 62 is cooled by the heat exchanger 9 before entering the water ring vacuum pump 5 through the liquid replenishment port. The cold source of the heat exchanger 9 can come from a cryogenic water supply system or cryogenic water generated by other production systems.

[0033] In some embodiments, the upper end of the gas-liquid separator 6 is provided with a fresh water supply port 63, and the lower end of the gas-liquid separator 6 is provided with a wastewater discharge port 64. The wastewater discharge port 64 is connected to a second drainage pump 10, which is connected to an external sewage treatment system. It is understood that when the concentration of dissolved ammonia salts in the gas-liquid separator 6 is too high, it can be discharged as wastewater from the wastewater discharge port 64, and fresh water can be replenished through the fresh water supply port 63, thereby achieving the replacement of fresh water with wastewater. The replaced wastewater can be discharged to the external sewage treatment system for further treatment via the second drainage pump 10. In some embodiments, if the water treated by the sewage treatment system meets production standards, it can also be used as fresh water for replenishing the gas-liquid separator 6, thereby achieving the reuse of production resources and helping to reduce production costs.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 vacuum stripping gaseous product processing device, for connection to the top of a vacuum stripping tower (100), characterized in that, It includes a first condenser (1), a second condenser (2), a gas phase condenser receiving tank (3), a vacuum buffer tank (4), a water ring vacuum pump (5), and a gas-liquid separator (6). The first condenser (1) is connected to the top of the vacuum stripping tower (100). The top of the gas phase condenser (3) is provided with a first input port (31) and a first output port (32). The condensate discharge port of the first condenser (1) is connected to the first input port (31), the first output port (32) is connected to the input port of the second condenser (2), the non-condensable gas discharge port of the first condenser (1) is connected to the input port of the second condenser (2), the non-condensable gas discharge port of the second condenser (2) is connected to the vacuum buffer tank (4), and the water ring vacuum pump (5) and the gas-liquid separator (6) are connected downstream of the vacuum buffer tank (4) in sequence.

2. The vacuum stripping gas phase product processing apparatus according to claim 1, characterized in that, A partition (33) is vertically installed inside the vapor phase condenser (3). The first input port (31) is connected to a first pipe (34), and the first output port (32) is connected to a second pipe (35). The first pipe (34) and the second pipe (35) are located on both sides of the partition (33). A liquid injection space (36) is formed between the side wall of the partition (33) near the first pipe (34) and the inner wall of the vapor phase condenser (3). The lower end of the first pipe (34) is located in the liquid injection space (36).

3. The vacuum stripping gas phase product processing apparatus according to claim 2, characterized in that, The height of the bottom end of the first pipe (34) and the height of the bottom end of the second pipe (35) are both lower than the height of the top end of the partition (33), and the height of the bottom end of the first pipe (34) is lower than the height of the bottom end of the second pipe (35).

4. The vacuum stripping gas phase product processing apparatus according to claim 2, characterized in that, The bottom of the gas phase condenser (3) is provided with a second input port (37) corresponding to the position of the liquid injection space (36), and the condensate discharge port of the second condenser (2) is connected to the second input port (37).

5. The vacuum stripping gas phase product processing apparatus according to claim 4, characterized in that, The bottom of the gas phase condenser (3) is provided with a second output port (38) corresponding to the position of the liquid injection space (36), and the second output port (38) is connected to the first drain pump (7).

6. The vacuum stripping gas phase product processing apparatus according to claim 1, characterized in that, It also includes a backup condenser (8), which is connected in parallel with the first condenser (1). The condensate discharge port of the backup condenser (8) is connected to the first input port (31), and the non-condensable gas discharge port of the backup condenser (8) is connected to the input port of the second condenser (2).

7. The vacuum stripping gas phase product processing apparatus according to claim 1, characterized in that, The gas-liquid separator (6) is provided with a gas discharge port (61) at the top and a liquid output port (62) at the bottom. The liquid output port (62) is connected to the liquid replenishment port of the water ring vacuum pump (5).

8. The vacuum stripping gas phase product processing apparatus according to claim 7, characterized in that, A heat exchanger (9) is also provided between the liquid output port (62) and the liquid replenishment port of the water ring vacuum pump (5).

9. The vacuum stripping gas phase product processing apparatus according to claim 8, characterized in that, The upper end of the gas-liquid separator (6) is also provided with a fresh water supply port (63), and the lower end of the gas-liquid separator (6) is also provided with a wastewater discharge port (64).

10. The vacuum stripping gas phase product processing apparatus according to claim 9, characterized in that, The wastewater discharge port (64) is connected to a second drainage pump (10), which is connected to an external sewage treatment system.

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