A catalytic fractionating column overhead desalting device

Abstract

This utility model discloses a desalination device for the top of a catalytic fractionation column, relating to the field of catalytic fractionation column technology. It includes a fractionation column body, a tray fixed to the inside of the column body, and a desalination assembly. The desalination assembly is used to inject water to wash the surface of the top tray. The assembly includes an external delivery pipe, a distribution pipe, and nozzles. The pipeline formed by the external delivery pipe, distribution pipe, and nozzles is used to flush away salt deposits on the upper surface of the tray. By setting up the desalination assembly, water is transported to the inside of the fractionation column body through the pipeline formed by the external delivery pipe, distribution pipe, and nozzles, and washes the upper surface of the top tray, causing the salt crystals on the top tray to be washed away and dissolved. Simultaneously, the inclined guide plate allows the washed-away salt crystals to be smoothly carried by the water flow to the downcomer channel, preventing salt crystals from remaining on the upper surface of the tray and clogging the channel.

Description

Technical Field

[0001] This utility model relates to the field of catalytic fractionation tower technology, specifically a desalination device at the top of a catalytic fractionation tower. Background Technology

[0002] The catalytic fractionation tower is one of the core pieces of equipment in the catalytic cracking unit (FCCU) of an oil refinery. It is mainly used to fractionate the oil-gas mixture after the catalytic cracking reaction, separating products with different boiling point ranges (such as dry gas, liquefied petroleum gas, gasoline, diesel, recycled oil, and slurry oil). Its working principle is roughly as follows:

[0003] High-temperature oil and gas (approximately 500°C) enters from the bottom of the column. During its ascent, it comes into contact with the cold reflux liquid, causing the high-boiling-point components to condense while the lighter components continue to rise. Temperature gradient control is implemented: the temperature gradually increases from top to bottom, achieving multi-component fractionation. At the top of the column, 120°C, light hydrocarbons and gasoline are extracted; at the diesel side stream, 250°C, diesel fraction is extracted; at the bottom of the column, 350°C, the oil slurry circulation removes heat and catalyst powder. Reflux regulation is achieved by controlling the fractionation accuracy and thermal balance through cold reflux at the top of the column and intermediate circulating reflux.

[0004] Salt deposition in catalytic fractionation towers is a common operational problem in catalytic cracking units (FCCUs) of oil refineries. It mainly manifests as the deposition of salt substances on internal components of the tower (such as trays, packing, condensation systems, etc.), leading to decreased mass transfer efficiency, increased pressure drop, poor product separation effect, and even equipment corrosion and blockage. Based on this, a desalination device for the top of a catalytic fractionation tower is provided. Utility Model Content

[0005] The purpose of this invention is to provide a desalination device at the top of a catalytic fractionation tower in order to solve the problems mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a desalination device for the top of a catalytic fractionation tower, comprising a fractionation tower body and a tray fixed inside the fractionation tower body, wherein a desalination component extending into the interior of the fractionation tower body is provided on the outer side of the fractionation tower body near the top, and the desalination component is used to wash the surface of the top tray with water.

[0007] The desalination assembly includes an external delivery pipe, a diversion pipe, and a nozzle;

[0008] The external delivery pipe is distributed on the outside of the fractionation tower body, the diversion pipe is fixed to one side of the external delivery pipe and communicates with the external delivery pipe, and the other side of the diversion pipe extends into the interior of the fractionation tower body and is distributed above the top tray.

[0009] The nozzle is fixed to the outside of the diversion pipe and connected to the diversion pipe. The nozzle is tilted towards the upper surface of the tower plate. The pipeline consisting of the external delivery pipe, the diversion pipe and the nozzle is used to rinse the salt deposits on the upper surface of the tower plate.

[0010] As a further embodiment of this utility model: a liquid descending guide plate is fixed to one end of the tower plate, the top of the liquid descending guide plate protrudes from the upper surface of the tower plate, an inclined guide plate is fixed to the top of the liquid descending guide plate, and the other end of the inclined guide plate is inclined downward and welded to the top of the tower plate.

[0011] The trays are evenly arranged in multiple ways along the vertical direction of the distillation column, and the downcomer plates on adjacent trays are symmetrically distributed.

[0012] As a further improvement of this utility model: multiple diversion pipes are evenly arranged along the long side of the outer delivery pipe, and multiple nozzles are arranged on a single diversion pipe.

[0013] As a further improvement of this utility model, the nozzle is tilted toward the tilting guide plate.

[0014] As a further improvement of this utility model, inclined guide plates are provided on each of the multiple tower plates.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By installing a desalination component, water is transported to the interior of the fractionation tower through a pipeline consisting of an external delivery pipe, a distribution pipe, and a nozzle. This process washes the upper surface of the top tray, dissolving the salt crystals on the top tray. At the same time, the inclined guide plate allows the washed-out salt crystals to be smoothly carried by the water flow to the downcomer channel, preventing salt crystals from remaining on the upper surface of the tray and causing blockage of the channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 3 This is a cross-sectional front view of the present invention.

[0020] In the diagram: 1. Distillation tower body; 2. Tower tray; 3. Downcomer; 4. Desalination assembly; 401. External delivery pipe; 402. Diverter pipe; 403. Nozzle; 404. Inclined guide plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-3 In this embodiment of the present invention, a desalination device for the top of a catalytic distillation tower includes a distillation tower body 1 and a tower plate 2 fixed inside the distillation tower body 1. A desalination component 4 extending into the interior of the distillation tower body 1 is provided on the outer side of the distillation tower body 1 near the top. The desalination component 4 is used to wash the surface of the top tower plate 2 with water.

[0023] Desalination assembly 4 includes an external delivery pipe 401, a diversion pipe 402, and a nozzle 403;

[0024] The external conveying pipe 401 is distributed on the outside of the fractionation tower body 1. The diversion pipe 402 is fixed to one side of the external conveying pipe 401 and connected to the external conveying pipe 401. The other side of the diversion pipe 402 extends into the interior of the fractionation tower body 1 and is distributed above the top tray 2.

[0025] The nozzle 403 is fixed to the outside of the diversion pipe 402 and connected to the diversion pipe 402. The nozzle 403 is tilted towards the upper surface of the tray 2. The pipeline consisting of the external conveying pipe 401, the diversion pipe 402, and the nozzle 403 is used to rinse the salt deposits on the upper surface of the tray 2.

[0026] A downcomer 3 is fixed to one end of the tray 2. The top of the downcomer 3 protrudes from the upper surface of the tray 2. An inclined guide 404 is fixed to the top of the downcomer 3. The other end of the inclined guide 404 is inclined downward and welded to the top of the tray 2.

[0027] Multiple trays 2 are evenly arranged along the vertical direction of the distillation column body 1, and the downcomer plates 3 on two adjacent trays 2 are symmetrically distributed.

[0028] Multiple diversion pipes 402 are evenly arranged along the long side of the external delivery pipe 401, and multiple nozzles 403 are arranged on a single diversion pipe 402.

[0029] In this embodiment, it should be noted that the temperature of the top tray 2 is in the low-temperature zone (<120°C), which makes it very easy to generate ammonium salt crystals such as NH4Cl and NH4HS. Therefore, the desalting component 4 is mainly used to clean the salt crystals on the upper surface of the top tray 2.

[0030] Water is connected to an external water supply pipeline via an external delivery pipe 401. Water is transported to the interior of the fractionation tower 1 through the pipeline consisting of the external delivery pipe 401, the diversion pipe 402, and the nozzle 403. Water washes the upper surface of the top tray 2, causing the salt crystals on the upper surface of the top tray 2 to be washed away and dissolved. Then, water flows along the inclined guide plate 404 to the downcomer channel formed by the downcomer guide plate 3 and the inner wall of the fractionation tower 1. After that, water is discharged through the fractionation tower's own condensation reflux system. Finally, the mixed liquid discharged through the oil-water separator is separated into oil and water.

[0031] Please refer to this carefully. Figures 2-3 The nozzle 403 is tilted toward the inclined guide plate 404, and inclined guide plates 404 are provided on multiple tower plates 2.

[0032] In this embodiment: the water flow sprayed by the nozzle 403 can wash the surface of the tray 2, so as to loosen and dissolve the salt crystals on the upper surface of the top tray 2. The inclined guide plate 404 can smoothly carry the washed salt crystals to the downcomer channel by the water flow, so as to avoid the salt crystals remaining on the upper surface of the tray 2 and causing the channel on the tray 2 to be blocked.

[0033] Salt crystals flowing along the multiple trays 2 and the downcomer channels will continuously dissolve in the water, achieving a good desalination effect.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A desalination device for the top of a catalytic fractionation column, comprising a fractionation column body (1) and a tray (2) fixed to the inner side of the fractionation column body (1), characterized in that, A desalination assembly (4) extending into the interior of the fractionation tower body (1) is provided on the outer side of the tower body (1) near the top. The desalination assembly (4) is used to wash the surface of the top tray (2) with water. The desalination assembly (4) includes an external delivery pipe (401), a diversion pipe (402), and a nozzle (403); The external conveying pipe (401) is distributed on the outside of the fractionation tower body (1), the diversion pipe (402) is fixed to one side of the external conveying pipe (401) and communicates with the external conveying pipe (401), and the other side of the diversion pipe (402) extends into the interior of the fractionation tower body (1) and is distributed above the top tray (2). The nozzle (403) is fixed to the outside of the diversion pipe (402) and connected to the diversion pipe (402). The nozzle (403) is tilted towards the upper surface of the tray (2). The pipeline consisting of the external conveying pipe (401), the diversion pipe (402) and the nozzle (403) is used to rinse the salt deposit on the upper surface of the tray (2).

2. The desalination device at the top of a catalytic fractionation tower according to claim 1, characterized in that, One end of the tray (2) is fixed with a downcomer (3), the top of the downcomer (3) protrudes from the upper surface of the tray (2), the top of the downcomer (3) is fixed with an inclined guide (404), and the other end of the inclined guide (404) is inclined downward and welded to the top of the tray (2). The trays (2) are evenly arranged in multiple directions along the vertical direction of the distillation tower body (1), and the downcomer plates (3) on two adjacent trays (2) are symmetrically distributed.

3. The desalination device at the top of a catalytic fractionation tower according to claim 1, characterized in that, Multiple diversion pipes (402) are evenly arranged along the long side of the external delivery pipe (401), and multiple nozzles (403) are provided on each diversion pipe (402).

4. The desalination device at the top of a catalytic fractionation tower according to claim 2, characterized in that, The nozzle (403) is tilted toward the tilting guide plate (404).

5. The desalination device at the top of a catalytic fractionation tower according to claim 2, characterized in that, Inclined guide plates (404) are provided on each of the multiple tower plates (2).

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