Fractionating tower top diversion anti-corrosion device

Abstract

The utility model provides a fractionating tower top diversion anti-corrosion device which is arranged at the top end of a fractionating tower body and comprises a diversion body and a connector, a liquid collecting tank and a supporting net are arranged in the diversion body, the supporting net is arranged above the liquid collecting tank, the supporting net is composed of a plurality of net layers, ceramic fibers are arranged between the net layers of the supporting net, and the connector is connected with the diversion body. A through hole communicated with the outside is formed in the bottom of the liquid collecting groove and connected with a liquid guide pipe, a drain valve is arranged in the liquid guide pipe, and a plurality of ammonia water injection openings are formed in the portion, above the supporting net, of the flow guide body. Therefore, the device has the advantages of collecting liquid acid condensed at the top of the tower due to low temperature, timely leading out the liquid acid at the top of the tower, preventing the inner wall of the fractionating tower from being corroded, and providing guarantee for the stability of a system in the fractionating tower.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum fractionation, and specifically relates to a flow guiding and anti-corrosion device for the top of a fractionation tower. Background Technology

[0002] Atmospheric and vacuum distillation units are core equipment in petroleum refining, mainly used for the initial separation of crude oil. Corrosion in the low-temperature parts of atmospheric and vacuum distillation units has always threatened the safe operation of the unit, especially corrosion leaks occurring at the top of the atmospheric distillation tower. This problem occurs frequently in atmospheric and vacuum distillation units in petrochemical systems and poses a great safety hazard.

[0003] During crude oil fractionation, a mixture of water vapor and acidic gases is distilled out. The acidic gases mainly consist of HCl, H2, and S. The temperature inside the fractionation tower decreases with increasing height. When the temperature of the oil and gas at the top of the tower is lower than the dew point temperature of the acidic gases, the acidic gases condense into liquid acid as the mixture passes through the top of the tower, causing a sharp increase in the corrosion rate. Although existing technologies monitor the top temperature in real time to prevent the formation of liquid acid, the calculation of the dew point temperature has been limited by the properties of the oil at the top of the tower and the measurement methods. Real-time display of the dew point temperature on a DCS system has been difficult, and the calculated data often has significant deviations, failing to provide operators with effective data references. This makes it impossible to effectively prevent the formation of liquid acid. Therefore, a new device is needed to promptly remove the liquid acid from the top of the tower, ensuring the stability of the system within the fractionation tower.

[0004] Therefore, in view of the shortcomings of the above-mentioned solutions in actual production and implementation, they have been modified and improved. At the same time, in the spirit and concept of seeking the best, with the assistance of professional knowledge and experience, and after a lot of ingenuity and experimentation, this utility model was created. It provides a distillation tower top flow guiding and anti-corrosion device to solve the problem of increased corrosion rate in the distillation tower caused by the condensation of acidic gas into liquid acid in the prior art. Utility Model Content

[0005] This invention proposes a top flow guiding and anti-corrosion device for distillation towers, which solves the problems in the prior art.

[0006] The technical solution of this utility model is implemented as follows: A top flow guiding and anti-corrosion device for a fractionating tower is provided, which is installed at the top of the fractionating tower body. It includes a flow guide and a connector. The upper end of the flow guide is provided with an air outlet. The connector is used to connect to the top of the fractionating tower body. The flow guide is provided with a liquid collection tank and a support net inside. The support net is located above the liquid collection tank. The support net is composed of several mesh layers. Ceramic fiber optic strips are provided between the mesh layers of the support net. The bottom of the liquid collection tank is provided with a through hole that connects to the outside and is connected to a flow guide pipe. A drain valve is provided inside the flow guide pipe. Several ammonia water injection ports are provided on the part of the flow guide above the support net.

[0007] In a preferred embodiment, the liquid guide tube is connected to a U-shaped pipe, the U-shaped pipe having an inverted U-shape structure, the U-shaped pipe having a liquid seal injection port, and the U-shaped pipe being connected to a gas phase separator.

[0008] In a preferred embodiment, the inner wall of the fluid guide is provided with a ceramic protective layer, which is coated on the entire inner wall of the fluid guide and the inner wall of the liquid collection tank.

[0009] In a preferred embodiment, the connector is provided with a closed heat-conducting oil groove around its periphery, the heat-conducting oil groove has a spiral structure inside, and the side wall of the heat-conducting oil groove has through holes that connect to the oil inlet pipe and the oil outlet pipe respectively. The oil inlet pipe is connected to the lower end of the side wall of the heat-conducting oil groove, and the oil outlet pipe is connected to the upper end of the side wall of the heat-conducting oil groove.

[0010] In a preferred embodiment, the connection between the liquid guide tube and the fluid guide tube is sealed with packing.

[0011] In a preferred embodiment, each layer of the support mesh is composed of several mesh panels spliced ​​together, and the mesh panels in the support mesh are made of 316L stainless steel.

[0012] The beneficial effects of this utility model after adopting the above technical solution are as follows: This utility model sets a support mesh inside the guide fluid, with ceramic fiber ferrules between the mesh layers. The porous structure of the ceramic fiber ferrules adsorbs the liquid acid into its interior, allowing the liquid acid to flow downwards along the fiber structure inside the ceramic fiber ferrules and the texture of the support mesh, preventing the liquid acid from condensing and dripping directly. By setting an ammonia water injection port, the injection of ammonia water neutralizes the acidity of the liquid acid while also accelerating its flow, allowing the mixture of ammonia water and liquid acid to flow along the support mesh and ceramic fiber ferrules into the collection tank. By setting a closed heat-conducting oil tank around the connector, the heat-conducting oil maintains the temperature above the boiling point of the liquid acid, providing a high temperature for the system environment at the top of the fractionation tower. This increases the temperature at the top of the fractionation tower, preventing the liquid acid from condensing, and also prevents the already formed liquid acid from falling back into the tower. In summary, this invention has the advantages of collecting liquid acid that condenses at the top of the distillation column due to low temperature, promptly drawing out the liquid acid from the top of the column, preventing corrosion of the inner wall of the distillation column, and ensuring the stability of the system within the distillation column. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a front cross-sectional view of the present invention;

[0015] Figure 3 This is a bottom-view cross-sectional diagram of the present invention;

[0016] Figure 4 This is a perspective view of the overall structure of this utility model;

[0017] Figure 5 This is a schematic diagram of the support mesh structure of this utility model;

[0018] In the diagram, 1-flow guide; 2-air outlet; 3-connector; 4-ceramic protective layer; 5-liquid collection tank; 6-support mesh; 7-ceramic fiber liner; 8-liquid guide pipe; 9-drain valve; 10-ammonia water injection port; 11-heat transfer oil tank; 12-oil inlet pipe; 13-oil outlet pipe; 14-distillation tower body; 15-U-shaped pipe; 16-liquid seal injection port; 17-gas phase separator. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 5 As shown, a top flow guide and anti-corrosion device for a fractionating tower is installed at the top of the fractionating tower body 14. It includes a flow guide 1 and a connector 3. The connector 3 is used to connect to the top of the fractionating tower body 14. The upper end of the flow guide 1 is provided with an outlet 2. The connection between this device and the fractionating tower body 14 and the outlet 2 is mechanically connected and sealed with packing. The inner wall of the flow guide 1 is provided with a ceramic protective layer 4. The ceramic protective layer 4 is coated on the entire inner wall of the flow guide 1 and the inner wall of the liquid collection tank 5. The flow guide 1 is provided with a liquid collection tank 5 and a support net 6. The support net 6 is located above the liquid collection tank 5. The support net 6 is composed of several mesh layers. Each mesh layer in the support net 6 is spliced ​​together from several mesh plates. The mesh plates in the support net 6 are made of 316L stainless steel. Ceramic fiber optic strips 7 are provided between the mesh layers of the support net 6. When the mixed gas passes through the top of the fractionation tower 14 to the outlet 2, if the temperature at the outlet 2 is lower than the dew point temperature, liquid acid will condense. The liquid acid adheres to the nearby solid. A support mesh 6 is set in the guide fluid 1. Ceramic fiber ferrules 7 are set between the mesh layers of the support mesh 6. The porous structure of the ceramic fiber ferrules 7 will adsorb the liquid acid into the interior. The liquid acid flows down along the fiber structure inside the ceramic fiber ferrules 7 and the texture structure of the support mesh 6, preventing the liquid acid from condensing and dripping directly.

[0021] The guide fluid 1 has several ammonia water injection ports 10 above the support mesh 6. The bottom of the collection tank 5 has a through hole connecting to the outside and a guide pipe 8 is connected to the through hole. The guide pipe 8 is equipped with a drain valve 9, and the connection between the guide pipe 8 and the guide fluid 1 is sealed with packing. Liquid acid flows down along the support mesh 6 and ceramic fiber sill 7. Ammonia water is injected from the ammonia water injection ports 10. The ammonia water injection ports 10 are located above the support mesh 6, so after injection, the ammonia water will also flow down along the support mesh 6 and ceramic fiber sill 7. The injection of ammonia water neutralizes the acidity of the liquid acid and also accelerates the flow of the liquid acid. The mixture of ammonia water and liquid acid flows along the support mesh 6 and ceramic fiber sill 7 into the collection tank 5. The collection tank 5 is connected to the guide pipe 8. The guide pipe 8 is equipped with a drain valve 9, which can discharge the mixture of ammonia water and liquid acid to the outside and prevent gas from flowing into the guide pipe 8 with the mixture.

[0022] The liquid guide pipe 8 is connected to a U-shaped pipe 15, which has an inverted U-shape and a liquid seal injection port 16. The U-shaped pipe 15 is connected to a gas phase separator 17. The liquid seal used in the U-shaped pipe 15 can further prevent the mixing of gas. The mixture of ammonia and liquid acid enters the gas phase separator 17 for post-processing.

[0023] The connector 3 is surrounded by a closed heat transfer oil tank 11. The heat transfer oil tank 11 has a spiral structure inside. Through holes are opened on the side wall of the heat transfer oil tank 11 to connect the oil inlet pipe 12 and the oil outlet pipe 13 respectively. The oil inlet pipe 12 is connected to the lower end of the side wall of the heat transfer oil tank 11, and the oil outlet pipe 13 is connected to the upper end of the side wall of the heat transfer oil tank 11. The heat transfer oil is injected into the heat transfer oil tank 11 through the oil inlet pipe 12, fills the heat transfer oil tank 11 upward along the spiral structure, and is finally discharged through the oil outlet pipe 13. The heat transfer oil provides high temperature, which on the one hand increases the temperature at the top of the fractionation column to prevent the condensation of liquid acid, and on the other hand prevents the formed liquid acid from falling back into the column. The temperature of the heat transfer oil does not need to be precisely controlled, it is enough to provide a high temperature environment at the top of the column.

[0024] This invention features a support mesh 6 within the guide tube 1, with ceramic fiber ferrules 7 between the mesh layers. The porous structure of the ceramic fiber ferrules 7 absorbs liquid acid, which then flows downwards along the fiber structure of the ceramic fiber ferrules 7 and the texture of the support mesh 6, preventing the liquid acid from condensing and dripping directly. An ammonia injection port 10 is provided, which neutralizes the acidity of the liquid acid and accelerates its flow, allowing the mixture of ammonia and liquid acid to flow along the support mesh 6 and ceramic fiber ferrules 7 into the collection tank 5. A closed heat-conducting oil tank 11 is provided around the connector 3, maintaining the temperature of the heat-conducting oil above the boiling point of the liquid acid. This provides a high-temperature environment for the system at the top of the fractionation tower, increasing the temperature at the top of the tower to prevent condensation of the liquid acid and preventing any formed liquid acid from falling back into the tower. In summary, this invention has the advantages of collecting liquid acid that condenses at the top of the distillation column due to low temperature, promptly drawing out the liquid acid from the top of the column, preventing corrosion of the inner wall of the distillation column, and ensuring the stability of the system within the distillation column.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A top flow guiding and corrosion prevention device for a fractionating tower, located at the top of the fractionating tower body (14), characterized in that, The device includes a guide fluid (1) and a connector (3). The guide fluid (1) has an outlet (2) at its upper end. The connector (3) is used to connect to the top of the fractionation tower body (14). The guide fluid (1) has a collection tank (5) and a support net (6) inside. The support net (6) is located above the collection tank (5). The support net (6) is composed of several mesh layers. Ceramic fiber stalks (7) are provided between the mesh layers of the support net (6). The bottom of the collection tank (5) has a through hole that connects to the outside and is connected to a guide pipe (8). A drain valve (9) is provided inside the guide pipe (8). The part of the guide fluid (1) above the support net (6) has several ammonia water injection ports (10).

2. The anti-corrosion device for top flow guiding of a distillation tower according to claim 1, characterized in that, The liquid guide tube (8) is connected to a U-shaped pipe (15), which has an inverted U-shaped structure. The U-shaped pipe (15) is provided with a liquid seal injection port (16) and is connected to a gas phase separator (17).

3. The anti-corrosion device for top flow guiding of a distillation tower according to claim 1, characterized in that, The inner wall of the fluid guide (1) is provided with a ceramic protective layer (4), which is coated on the entire inner wall of the fluid guide (1) and the inner wall of the liquid collection tank (5).

4. The anti-corrosion device for top flow guiding of a distillation tower according to claim 1, characterized in that, The connector (3) is surrounded by a closed heat-conducting oil groove (11). The heat-conducting oil groove (11) has a spiral structure inside. The side wall of the heat-conducting oil groove (11) has through holes that connect the oil inlet pipe (12) and the oil outlet pipe (13) respectively. The oil inlet pipe (12) is connected to the lower end of the side wall of the heat-conducting oil groove (11), and the oil outlet pipe (13) is connected to the upper end of the side wall of the heat-conducting oil groove (11).

5. The anti-corrosion device for top flow guiding of a distillation tower according to claim 1, characterized in that, The connection between the liquid guide tube (8) and the fluid guide (1) is sealed with packing.

6. The anti-corrosion device for top flow guiding of a distillation tower according to claim 1, characterized in that, Each layer of the support mesh (6) is composed of several mesh plates spliced ​​together, and the mesh plates in the support mesh (6) are made of 316L stainless steel.

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