A method for online processing of a fractionating column tray clogging

Abstract

The present application relates to the technical fields of fractionating column tray blockage processing, and discloses an online processing method for fractionating column tray blockage, comprising the following steps: S1, blockage monitoring; S2, blockage point positioning; S3, blockage removal: corresponding removal measures are taken for the blockage point; and S4, monitoring recovery. The online processing method for fractionating column tray blockage, through online water washing of the fractionating column, uses desalted water to desalt the fractionating column, after desalting, uses diesel oil as a solvent to dissolve the tray of the fractionating column, separates the dirt, washes the dirt of the tray, ends the blockage state, detects the high solid content in the dewatering sample, judges whether the removed dirt, and removes the dirt while washing with the desalted water, so that the blockage of the tray can be thoroughly solved, and the online processing method does not hinder the operation of the fractionating column when removing the blockage, thereby improving the stability of the operation of the fractionating column.

Description

Technical Field

[0001] This invention relates to the field of fractionation column tray blockage treatment technology, specifically a method for online treatment of fractionation column tray blockage. Background Technology

[0002] The distillation column tray is the main component in the distillation column that provides the space for gas-liquid mass and heat transfer, enabling close heat and mass exchange between the two phases of the two fluids to achieve the purpose of separating the components of a liquid mixture or gas mixture. It mainly consists of gas-liquid contact elements (such as float valves, bubble caps, sieves, etc.), receiving trays, overflow weirs, downcomers (or downcomers), tray supports, and fasteners.

[0003] In existing technologies, after long-term use, distillation column trays become corroded and accumulate fouling. Online cleaning is typically used to treat the blockage and remove the fouling. However, in actual use, due to the unique structure of the distillation column top, water washing can only remove the surface fouling and cannot effectively address the blockage in the trays. Therefore, it is necessary to invent an online method for treating distillation column tray blockage to solve this problem. Summary of the Invention

[0004] (I) Technical Solution

[0005] To address the aforementioned issue of tray blockage in a fractionation column, this invention provides the following technical solution: a method for online treatment of tray blockage in a fractionation column, comprising the following steps:

[0006] S1, Blockage Monitoring

[0007] By using sensors or monitoring equipment, the working status and performance indicators of the distillation column trays can be monitored in real time. When indicators or obvious signs of blockage are detected, it can be determined that the tray is blocked.

[0008] S2, Locate the blockage point

[0009] By analyzing sensor data, the specific location of the blockage can be determined.

[0010] S3, Clear blockage

[0011] For each blockage point, appropriate removal measures should be taken.

[0012] S4, Monitoring and Recovery

[0013] After clearing the blockage, re-monitor the operating status of the fractionation column trays to ensure that the blockage has been completely eliminated and the performance indicators of the trays have returned to normal. Take preventive measures to prevent further blockages.

[0014] Preferably, in step S1, when judging the working status and performance indicators of the distillation column tray, pressure, temperature and flow rate are monitored to determine whether the tray is blocked. When pressure, temperature and flow rate are abnormal at the same time, the blockage can be located.

[0015] Preferably, in step S2, in order to accurately locate the blockage point, multiple sensors are used for multi-point detection.

[0016] Preferably, in step S3, in order to deal with the blockage of the distillation tower trays online, it is first necessary to reduce the top load of the tower. Reducing the top load is a key step, which requires reducing the throughput and reducing the amount of stripping steam for the reaction gas and diesel towers.

[0017] Control the top circulation extraction temperature to 115-125℃.

[0018] Preferably, in step S3, after the top load of the column is reduced, the fractionation column is washed online, and the demineralized water is transported to the top circulating column to start the online washing of the fractionation column trays.

[0019] The demineralized water flow rate is controlled from low to high, with a control range of 2-6 t / h.

[0020] Preferably, in step S3, in order to further resolve the clogging of the trays, diesel oil is selected as a solvent to dissolve and remove the scale and dirt on the top of the distillation tower trays.

[0021] Diesel fuel is injected into the top circulation oil, and the flow rate is controlled at 3-4 t / h.

[0022] Preferably, in step S3, the solid content in the dehydrated sample is detected and compared with the solid content before the blockage is removed. If the difference in the comparison result is large, it indicates that the scale and dirt have been removed.

[0023] Preferably, in step S4, the working status of the fractionation tower is re-tested. If the pressure, temperature, and flow rate return to normal, the declogging of the fractionation tower trays is completed.

[0024] Preferably, in step S4, in order to prevent tray blockage, the crude oil is first subjected to deep desalting before processing in the fractionation tower to reduce the salt content inside the raw material and control the salt concentration to below 5 mg / L.

[0025] The conventional fractionation tower inlet was changed to a return oil pipeline connection line to prevent water vapor inside the fractionation tower from entering the oil slurry pump.

[0026] Raising the operating line at the top of the fractionation column shortens the time the solids remain on the trays, reduces the accumulation of solids at the top of the trays, and avoids drastic changes in the operation of the fractionation column.

[0027] (II) Beneficial Effects

[0028] Compared with the prior art, the present invention provides a method for online treatment of tray blockage in distillation columns, which has the following beneficial effects:

[0029] 1. This online method for treating tray blockage in a fractionation tower involves online water washing of the fractionation tower, using demineralized water to desalinate the tower, and then using diesel fuel as a solvent to dissolve the trays, separating the scale and cleaning the trays to end the blockage. The method also involves detecting the high solid content in the dehydrated sample to determine if the scale has been removed. By simultaneously removing scale through demineralized water washing, the blockage in the trays can be thoroughly resolved. Furthermore, the online treatment method ensures that the clearing process does not hinder the operation of the fractionation tower, thus improving its operational stability.

[0030] 2. This method for online treatment of distillation column tray blockage utilizes sensors or detection equipment to monitor the working status and performance of the distillation column. When an abnormality is detected, the sensor is used to locate the blockage, and the dirt is removed online from the blockage point. After removal, preventative measures are taken to prevent further blockage, thus achieving the function of online unblocking of distillation column trays. Attached Figure Description

[0031] Figure 1 This is a flowchart of the process for unclogging the distillation tower trays according to the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] Please see Figure 1 This invention provides a technical solution: a method for online treatment of tray blockage in a distillation column, comprising the following steps:

[0035] S1, Blockage Monitoring

[0036] By using sensors or monitoring equipment, the working status and performance indicators of the distillation column trays can be monitored in real time. When indicators or obvious signs of blockage are detected, it can be determined that the tray is blocked.

[0037] S2, Locate the blockage point

[0038] By analyzing sensor data, the specific location of the blockage can be determined.

[0039] S3, Clear blockage

[0040] For each blockage point, appropriate removal measures should be taken.

[0041] S4, Monitoring and Recovery

[0042] After clearing the blockage, re-monitor the operating status of the fractionation column trays to ensure that the blockage has been completely eliminated and the performance indicators of the trays have returned to normal. Take preventive measures to prevent further blockages.

[0043] Furthermore, in step S1, when judging the working status and performance indicators of the distillation column tray, pressure, temperature, and flow rate are monitored to determine whether the tray is blocked. When pressure, temperature, and flow rate are all abnormal, the blockage can be located.

[0044] Furthermore, in step S2, in order to accurately locate the blockage point, multiple sensors are used for multi-point detection when detecting the blockage point.

[0045] Furthermore, in step S3, in order to deal with the blockage of the distillation tower trays online, it is first necessary to reduce the top load of the tower. Reducing the top load is a key step, which requires reducing the throughput and reducing the amount of stripping steam for the reaction gas and diesel towers.

[0046] Control the top circulation extraction temperature to 115℃.

[0047] Further, in step S3, after the top load of the column is reduced, the fractionation column is washed online. The demineralized water is transported to the top circulation column to start the online washing of the fractionation column trays.

[0048] The demineralized water flow rate is controlled from low to high, with a control range of 2t / h.

[0049] Furthermore, in step S3, in order to further address the clogging of the trays, diesel oil is selected as a solvent to dissolve and remove the scale and dirt on the top of the distillation tower trays.

[0050] Diesel fuel is injected into the top circulation oil, and the flow rate is controlled at 3t / h.

[0051] Furthermore, in step S3, the solid content in the dehydrated sample is tested and compared with the solid content before the blockage is removed. If the difference in the comparison result is large, it indicates that the scale and dirt have been removed.

[0052] Furthermore, in step S4, the operating status of the fractionation tower is re-tested. If the pressure, temperature, and flow rate return to normal, the declogging of the fractionation tower trays is completed.

[0053] Furthermore, in step S4, in order to prevent tray blockage, the crude oil is first subjected to deep desalting before being processed in the fractionation tower to reduce the salt content inside the raw material and control the salt concentration to below 5 mg / L.

[0054] The conventional fractionation tower inlet was changed to a return oil pipeline connection line to prevent water vapor inside the fractionation tower from entering the oil slurry pump.

[0055] Raising the operating line at the top of the fractionation column shortens the time the solids remain on the trays, reduces the accumulation of solids at the top of the trays, and avoids drastic changes in the operation of the fractionation column.

[0056] Example 2:

[0057] Please see Figure 1 This invention provides a technical solution: a method for online treatment of tray blockage in a distillation column, comprising the following steps:

[0058] S1, Blockage Monitoring

[0059] By using sensors or monitoring equipment, the working status and performance indicators of the distillation column trays can be monitored in real time. When indicators or obvious signs of blockage are detected, it can be determined that the tray is blocked.

[0060] S2, Locate the blockage point

[0061] By analyzing sensor data, the specific location of the blockage can be determined.

[0062] S3, Clear blockage

[0063] For each blockage point, appropriate removal measures should be taken.

[0064] S4, Monitoring and Recovery

[0065] After clearing the blockage, re-monitor the operating status of the fractionation column trays to ensure that the blockage has been completely eliminated and the performance indicators of the trays have returned to normal. Take preventive measures to prevent further blockages.

[0066] Furthermore, in step S1, when judging the working status and performance indicators of the distillation column tray, pressure, temperature, and flow rate are monitored to determine whether the tray is blocked. When pressure, temperature, and flow rate are all abnormal, the blockage can be located.

[0067] Furthermore, in step S2, in order to accurately locate the blockage point, multiple sensors are used for multi-point detection when detecting the blockage point.

[0068] Furthermore, in step S3, in order to deal with the blockage of the distillation tower trays online, it is first necessary to reduce the top load of the tower. Reducing the top load is a key step, which requires reducing the throughput and reducing the amount of stripping steam for the reaction gas and diesel towers.

[0069] Control the top circulation extraction temperature to 125℃.

[0070] Further, in step S3, after the top load of the column is reduced, the fractionation column is washed online. The demineralized water is transported to the top circulation column to start the online washing of the fractionation column trays.

[0071] The demineralized water flow rate is controlled from low to high, with a control range of 6t / h.

[0072] Furthermore, in step S3, in order to further address the clogging of the trays, diesel oil is selected as a solvent to dissolve and remove the scale and dirt on the top of the distillation tower trays.

[0073] Diesel fuel is injected into the top circulation oil, and the flow rate is controlled at 4t / h.

[0074] Furthermore, in step S3, the solid content in the dehydrated sample is tested and compared with the solid content before the blockage is removed. If the difference in the comparison result is large, it indicates that the scale and dirt have been removed.

[0075] Furthermore, in step S4, the operating status of the fractionation tower is re-tested. If the pressure, temperature, and flow rate return to normal, the declogging of the fractionation tower trays is completed.

[0076] Furthermore, in step S4, in order to prevent tray blockage, the crude oil is first subjected to deep desalting before being processed in the fractionation tower to reduce the salt content inside the raw material and control the salt concentration to below 5 mg / L.

[0077] The conventional fractionation tower inlet was changed to a return oil pipeline connection line to prevent water vapor inside the fractionation tower from entering the oil slurry pump.

[0078] Raising the operating line at the top of the fractionation column shortens the time the solids remain on the trays, reduces the accumulation of solids at the top of the trays, and avoids drastic changes in the operation of the fractionation column.

[0079] By utilizing sensors or detection equipment to monitor the working status and performance of the fractionation tower, when an abnormality is detected, the sensors locate the blockage and perform online cleaning of the blockage point. After cleaning, preventative measures are taken to prevent further blockage. This achieves the function of online unclogging of the fractionation tower trays. The fractionation tower is washed online with desalinated water. After desalination, diesel oil is used as a solvent to dissolve the scale in the trays, separating the scale and cleaning the trays, thus ending the blockage. The high solid content in the dehydrated sample is detected to determine whether the scale has been removed. While removing scale through desalinated water washing, the blockage in the trays can be thoroughly resolved. The online processing method ensures that unclogging does not hinder the operation of the fractionation tower, improving the stability of the fractionation tower operation.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for online treatment of tray blockage in a distillation column, characterized in that, Includes the following steps: S1, Blockage Monitoring By using sensors, the working status and performance indicators of the distillation column trays are monitored in real time. When signs of blockage are detected, it can be determined that the tray is blocked. In step S1, when judging the working status and performance indicators of the distillation column tray, pressure, temperature and flow rate are monitored to determine whether the tray is blocked. When pressure, temperature and flow rate are abnormal at the same time, the blockage can be located. S2, Locate the blockage point By analyzing sensor data, the specific location of the blockage can be determined; In step S2, when detecting blockage points, multiple sensors are used for multi-point detection in order to accurately locate the blockage points. S3, Clear blockage For each blockage point, appropriate removal measures should be taken; In step S3, in order to deal with the blockage of the distillation tower trays online, it is first necessary to reduce the top load of the tower. Reducing the top load is a key step, which requires reducing the throughput and reducing the amount of stripping steam for the reaction gas and diesel towers. Control the top circulation extraction temperature, keeping it between 115-125℃; In step S3, after the top load of the column is reduced, the fractionation column is washed online. The demineralized water is transported to the top circulation column to start the online washing of the fractionation column trays. In step S3, in order to solve the blockage of the trays more thoroughly, diesel oil is selected as a solvent to dissolve and remove the scale and dirt on the top of the distillation tower trays. Diesel fuel is injected into the top circulation oil, and the flow rate is controlled at 3-4 t / h; S4, Monitoring and Recovery After clearing the blockage, re-monitor the working status of the distillation column trays to ensure that the blockage has been completely eliminated and the performance indicators of the trays have returned to normal. Take preventive measures to prevent further blockage. In step S4, in order to prevent the trays from clogging, the crude oil is first deeply desalted before it is processed in the fractionation tower to reduce the salt content inside the raw material and control the salt concentration to below 5 mg / L. The conventional fractionation tower inlet was changed to the return oil pipeline connection line to prevent water vapor inside the fractionation tower from entering the oil slurry pump; Raise the operating line at the top of the fractionation column to shorten the residence time of solids on the trays, reduce the accumulation of solids at the top of the trays, and avoid drastic changes in the operation of the fractionation column. In step S4, the working status of the distillation tower is re-tested. If the pressure, temperature, and flow rate return to normal, the distillation tower tray unblocking is completed.

2. The method for online treatment of tray blockage in a distillation column according to claim 1, characterized in that, In step S3, the solid content in the dehydrated sample is detected and compared with the solid content before the blockage is removed. If the difference in the comparison result is large, it indicates that the scale and dirt have been removed.

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