A device for treating a crude benzol regenerator malfunction without stopping production

Abstract

This utility model relates to a crude benzene processing apparatus. Specifically, it relates to a device for handling crude benzene regenerator malfunctions without interrupting production. The device includes a tubular furnace, a regenerator, a residue tank, and a benzene removal tower. One end of the tubular furnace is connected to the regenerator via pipes and valves, and the tubular furnace is also connected to the benzene removal tower via pipes and valves. One end of the regenerator is connected to the residue tank via pipes and valves. Another end of the tubular furnace is connected to an external gas inlet via pipes and valves, and the pipe on this side is connected to the pipe between the tubular furnace and the benzene removal tower. When the liquid level in the regenerator drops below the leak point, nitrogen can seal the leak point, preventing air from entering the regenerator and avoiding fire and explosion accidents. This can prevent production losses caused by regenerator malfunctions. After implementation of this invention, the hot oil in the regenerator can be emptied within half an hour, and the regenerator can be filled with nitrogen to prevent fire and explosion accidents.

Description

Technical Field

[0001] This utility model relates to crude benzene processing equipment. In the technical field, it specifically relates to a device for handling crude benzene regenerator malfunctions without interrupting production. Background Technology

[0002] The trays inside the crude benzene regenerator are constantly eroded by steam, and some trays may become loose and fall off. These loose trays will continuously rub against the tower wall under the influence of steam, eventually causing leaks in the regenerator sidewalls. The hot oil (approximately 185°C) coming into direct contact with air poses a significant fire hazard, necessitating an immediate shutdown of the crude benzene distillation process. At this point, immediate repairs to the regenerator are required. Based on past experience, this involves a series of maintenance procedures, including draining oil from the regenerator, cleaning, cooling, sealing blind flanges, drilling manholes, ventilation, and confined space operations. The repair time is typically three days. During this period, the crude benzene distillation process remains shut down, impacting the production of light benzene.

[0003] The nominal diameter of the pipe discharging residue from the regenerator into the residue tank is DN25. If the hot oil inside the regenerator is allowed to drain by gravity, it would take at least 6 hours. Furthermore, when the liquid level in the regenerator drops below the leak point, air can enter the regenerator through the leak, creating an explosive gas mixture in the top space of the regenerator, posing a significant safety hazard. Several fires have occurred at regenerators in the coking industry. Therefore, a fast and safe oil drainage method is needed to address this safety hazard. Utility Model Content

[0004] Technical problems to be solved

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a crude benzene regenerator failure non-stop production handling device, which can effectively solve the problems in the existing technology.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model provides a device for handling crude benzene regenerator malfunctions without interrupting production, including a tubular furnace, a regenerator, a residue tank, and a benzene removal tower. One end of the tubular furnace is connected to the regenerator through pipes and valves, the tubular furnace is connected to the benzene removal tower through pipes and valves, and one end of the regenerator is connected to the residue tank through pipes and valves.

[0009] Furthermore, one end of the tubular furnace is connected to the external gas inlet via pipes and valves, and the pipe on that side is connected to the pipe between the tubular furnace and the benzene removal tower.

[0010] Furthermore, one end of the regenerator is connected to the pipeline between the tubular furnace and the benzene removal tower via pipes and valves, and one end of the benzene removal tower is connected to the superheated steam pipeline.

[0011] Furthermore, one end of the tubular furnace is connected to the steam inlet and the rich oil inlet pipe, and one end of the benzene removal tower is connected to the top reflux of the light benzene tower.

[0012] Furthermore, the top of the regenerator is kept in communication with the nitrogen inlet, and the regenerator is kept in communication with the benzene removal tower through pipes and valves.

[0013] Furthermore, the outer side of the residue tank is kept in communication with the external cooling structure through pipes and valves.

[0014] Beneficial effects

[0015] The technical solution provided by this utility model has the following advantages compared with the known public technology:

[0016] In this invention, the benzene removal tower directly utilizes the superheated steam from the tubular furnace for production, without requiring rich oil regeneration in a short period, thus avoiding any impact on production. During the oil discharge process from the regenerator, nitrogen pressure accelerates the discharge of hot oil, while simultaneously creating a nitrogen-protected space at the top of the regenerator. When the liquid level inside the regenerator drops below the leak point, the nitrogen seals the leak, preventing air from entering the regenerator and avoiding fire or explosion accidents. This prevents production losses due to regenerator malfunctions. After implementing this invention, the hot oil in the regenerator can be emptied within half an hour, and the regenerator can be filled with nitrogen to prevent fire or explosion accidents. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a flowchart of the present invention.

[0020] The labels in the diagram represent: 1. Tubular furnace; 2. Regenerator; 3. Residue tank; 4. Valve; 5. Benzene removal tower; 6. Pipeline. Detailed Implementation

[0021] 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. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Example: A device for handling crude benzene regenerator malfunctions without interrupting production, as shown in the attached document. Figure 1 - Appendix Figure 2 The system includes a tubular furnace 1, a regenerator 2, a residue tank 3, and a benzene removal tower 5. One end of the tubular furnace 1 is connected to the regenerator 2 via a pipe 6 and a valve 4. The tubular furnace 1 is also connected to the benzene removal tower 5 via a pipe 6 and a valve 4. One end of the regenerator 2 is connected to the residue tank 3 via a pipe 6 and a valve 4. The benzene removal tower 4 directly utilizes the superheated steam after the tubular furnace 1 for production, without performing rich oil regeneration for a short period, thus not affecting production. During the oil discharge process of the regenerator 2, the pressure of nitrogen can accelerate the discharge of hot oil. At the same time, a nitrogen protective space is formed at the top of the regenerator 2. When the liquid level in the regenerator 2 drops below the leak point, the nitrogen can seal the leak point, preventing air from entering the regenerator 2 and avoiding fire and explosion accidents. This can avoid production losses caused by the failure of the regenerator 2. After the implementation of this invention, the hot oil in the regenerator 2 can be emptied within half an hour, and the regenerator 2 can be filled with nitrogen to prevent fire and explosion accidents.

[0024] One end of the tubular furnace 1 is connected to the external gas inlet through a pipe 6 and a valve 4, and the pipe 6 on this side is connected to the pipe 6 between the tubular furnace 1 and the benzene removal tower 5.

[0025] One end of the regenerator 2 is connected to the pipe 6 between the tubular furnace 1 and the benzene removal tower 5 via pipe 6 and valve 4. One end of the benzene removal tower 5 is connected to the superheated steam pipe. One end of the tubular furnace 1 is connected to the steam inlet and the rich oil inlet pipe. One end of the benzene removal tower 5 is connected to the top reflux of the light benzene tower. The top of the regenerator 2 is connected to the nitrogen inlet. The regenerator 2 is connected to the benzene removal tower 5 via pipe 6 and valve 4. The outside of the residue tank 3 is connected to the external blast cooling structure via pipe 6 and valve 4.

[0026] Therefore, during use, when a leak occurs in the regenerator, the production shutdown process is as follows:

[0027] 1. Close valve 1 to stop adding oil to the regenerator.

[0028] 2. Open valves 7 and 8 to introduce direct superheated steam into the benzene removal tower.

[0029] 3. Close valves 5 and 2 to stop the flow of superheated steam into the regenerator.

[0030] 4. Adjust the opening of valves 7 and 8 to ensure that the pressure at the top of the benzene removal tower does not exceed 0.01 MPa and the pressure at the bottom of the benzene removal tower does not exceed 0.05 MPa. Adjust the flow rate of light benzene at the top of the tower to maintain the temperature at the top of the benzene removal tower at 78℃~80℃.

[0031] 5. Open valve 6 to its maximum opening, open valve 4 to introduce nitrogen into the regenerator, maintain the pressure at the top of the regenerator at 20~50KPa, and vent the hot oil and residue in the regenerator into the residue tank.

[0032] 6. After the regenerator is vented, close valve 6 and continue to maintain nitrogen pressure at 20~50 kPa.

[0033] 7. After the regenerator cools down to room temperature, open the venting valve 3, add clean water to the regenerator, fill the water level to 80%~85% of the total volume of the regenerator, and then pass steam through it to clean it. Then, vent the water through the residue tank to the cooling process. Repeat this step 3 times.

[0034] 8. Install blind flanges at valves 1, 2, 4, 5, and 6.

[0035] 9. After opening the valve, drill a manhole for the regenerator, ventilate, analyze the air, and complete the procedures for the confined space work area, enter for maintenance.

[0036] During this process, the benzene removal tower directly utilizes the superheated steam from the tubular furnace for production, without undergoing rich oil regeneration in a short period, thus not affecting production. During the regenerator oil discharge process, nitrogen pressure accelerates the discharge of hot oil, while simultaneously creating a nitrogen protection space at the top of the regenerator. When the liquid level inside the regenerator drops below the leak point, the nitrogen seals the leak, preventing air from entering the regenerator and avoiding fire or explosion accidents.

[0037] Once the regenerator maintenance is complete, the recovery process begins:

[0038] 1. Restore the manhole and close the valve. 3.

[0039] 2. Remove the blind flanges from the positions of valves 1, 2, 4, 5, and 6.

[0040] 3. Open valves 4, 6, and 9, and close valve 10. Introduce nitrogen into the regenerator and residue tank to completely replace the air inside them with nitrogen until the oxygen content of the gas discharged from the residue tank vent pipe is less than 1%. Maintain this state for 10 minutes.

[0041] 4. Close valves 4, 6, and 9, and open valve 10 to stop purging nitrogen into the regenerator.

[0042] 5. Open valves 2 and 1 to add rich oil to the regenerator until the liquid level in the regenerator reaches 1.8m~2.5m.

[0043] 6. Open valve 6 to resume the regenerator discharging residue into the residue tank.

[0044] 7. Slowly open valve 5, while gradually closing valves 7 and 8. During this process, maintain the pressure at the top of the benzene tower at no more than 0.01 MPa, the pressure at the bottom of the benzene removal tower at no more than 0.05 MPa, and the temperature at the top of the benzene removal tower at 78℃~80℃, until valves 7 and 8 are completely closed.

[0045] 8. Resume normal production operations.

[0046] The specific process during implementation is as follows:

[0047] 1. The superheated steam after the tubular furnace can enter the benzene stripping tower in two ways: one way passes through the regenerator before entering the tower, and the other way enters the tower directly. Under normal operating conditions, the steam passes through the regenerator; if the regenerator fails, the steam enters the tower directly.

[0048] 2. By introducing nitrogen gas into the top of the regenerator, the hot oil discharge speed is accelerated, nitrogen protection is formed at the same time, the venting time is shortened, and safety hazards are eliminated.

[0049] 3. Maintain the pressure at the top of the benzene removal tower at no more than 0.01 MPa and the pressure at the bottom of the benzene removal tower at no more than 0.05 MPa.

[0050] 4. Before adding rich oil after regenerator maintenance, open valve 2 to balance the internal pressure of the regenerator and the benzene removal tower, to prevent hot rich oil from being unable to be added into the regenerator after opening valve 1.

[0051] 5. After the regenerator is overhauled, purge the regenerator and residue tank with nitrogen to remove all air and prevent the formation of an explosive mixture during refueling, which could lead to an explosion.

[0052] 6. Throughout the process, the tubular furnace does not require extinguishing; normal production can be maintained.

[0053] 7. During the regenerator maintenance process, procedures for confined space work areas must be followed to eliminate safety risks.

[0054] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for handling crude benzene regenerator malfunctions without interrupting production, characterized in that, The system includes a tubular furnace (1), a regenerator (2), a residue tank (3), and a benzene removal tower (5). One end of the tubular furnace (1) is connected to the regenerator (2) via a pipe (6) and a valve (4). The tubular furnace (1) is connected to the benzene removal tower (5) via a pipe (6) and a valve (4). One end of the regenerator (2) is connected to the residue tank (3) via a pipe (6) and a valve (4). One end of the tubular furnace (1) is connected to the external gas inlet via a pipe (6) and a valve (4). The pipe (6) on this side is connected to the pipe (6) between the tubular furnace (1) and the benzene removal tower (5). One end of the regenerator (2) is connected to the pipe (6) between the tubular furnace (1) and the benzene removal tower (5) via a pipe (6) and a valve (4). One end of the benzene removal tower (5) is connected to a superheated steam pipe.

2. The crude benzene regenerator failure-stopping-production handling device according to claim 1, characterized in that, One end of the tubular furnace (1) is connected to the steam inlet and the rich oil inlet pipe, and one end of the benzene removal tower (5) is connected to the top reflux of the light benzene tower.

3. The crude benzene regenerator failure-stopping-production handling device according to claim 2, characterized in that, The top of the regenerator (2) is connected to the nitrogen inlet, and the regenerator (2) is connected to the benzene removal tower (5) through the pipe (6) and the valve (4).

4. The crude benzene regenerator failure-stopping-production handling device according to claim 1, characterized in that, The outer side of the residue tank (3) is connected to the external blast cooling structure through pipes (6) and valves (4).

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