Fractionating tower top volatilization line anti-corrosion equipment

Abstract

The invention relates to the technical field of fractionating tower corrosion prevention, in particular to fractionating tower top volatilization line corrosion prevention equipment. According to the technical scheme, the device comprises a deacidification skid-mounted device and a tower top, a gas injection pipe is embedded in the left side of the deacidification skid-mounted device, an acid discharge pipe is embedded in the side, away from the gas injection pipe, of the deacidification skid-mounted device, a liquid injection pipe and an exhaust pipe are arranged on the left side and the right side of the upper surface of the deacidification skid-mounted device respectively, and connecting flanges are arranged on one side of the gas injection pipe, one side of the acid discharge pipe, one side of the liquid injection pipe and one side of the exhaust pipe; one side of the pipeline is perforated and drained to be provided with an acid removal skid-mounted device, one end of the pipeline is fixedly connected with a tower top, the acid discharge pipe is movably connected with a return pipe through a connecting flange, and one side, far away from the acid discharge pipe, of the return pipe is connected with an external normal top return tank; according to the device, gas is injected into the deacidification skid-mounted device through the gas injection pipe, the gas reacts with a moderator and a neutralizer in the liquid injection pipe through a pipeline, liquid is injected into the liquid condensation tank through the liquid injection pipe, the liquid is uniformly distributed through the liquid injection distributor, and the liquid is sprayed by the spray heads to further remove acidic components in the gas.

Description

Technical Field

[0001] The invention relates to the technical field of fractionation tower anti-corrosion, in particular to a fractionation tower top volatile line anti-corrosion equipment. Background Art

[0002] The fractionation tower is a tower-type vapor-liquid device for distillation, which is commonly used in petrochemical and coal chemical refining. The gas phase and liquid phase mixture at the top of the fractionation tower (naphtha hydrogenation, diesel hydrogenation, wax oil hydrogenation and residue oil hydrogenation, etc.) contains a large amount of hydrogen sulfide, ammonia acid and alkaline gas, and ammonium sulfide salts, chloride salts, ferrous sulfide and other corrosive media. Ammonium salts are easy to crystallize and adhere to the inner tube wall. In the long-term production process, they cause serious corrosion to equipment and pipelines. In addition, ammonium salts that are easy to scale will cause under-scale corrosion, resulting in accidents such as pipeline and equipment leakage.

[0003] An important anti-corrosion measure used in the top condensation system of the atmospheric and vacuum tower of the refinery mainly includes injection of ammonia, injection of corrosion inhibitor and injection of water, which is commonly known as "one decomposition and three injections". The use of these injections can effectively prevent the corrosion of the top system and ensure the safe operation of the equipment.

[0004] Due to the deterioration of crude oil, the content of corrosive media in the tower top low temperature system increases, corrosion intensifies, and frequently causes leakage and failure of the heat exchanger. Existing anti-corrosion measures cannot effectively solve the corrosion of the tower top system. A distillation tower top oil and gas acid removal and anti-corrosion device is proposed to solve the corrosion of the tower top system. Summary of the invention

[0005] The object of the present invention is to provide a volatile line anti-corrosion device at the top of a fractionating tower to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a volatile line anti-corrosion equipment for the top of a distillation tower, comprising an acid removal skid and a tower top, an air injection pipe is embedded in the left side of the acid removal skid, an acid discharge pipe is embedded in the side of the acid removal skid away from the air injection pipe, a liquid injection pipe and an exhaust pipe are respectively arranged on the left and right sides of the upper surface of the acid removal skid, the air injection pipe, the acid discharge pipe, the liquid injection pipe and the exhaust pipe are all provided with connecting flanges on one side, the air injection pipe is movably connected to a pipeline through the connecting flange, one side of the pipeline is fixedly connected to the tower top, the acid discharge pipe is movably connected to a reflux pipe through the connecting flange, the side of the reflux pipe away from the acid discharge pipe is connected to an external top reflux tank, an electromagnetic valve is arranged between the acid discharge pipe and the top reflux tank, and a water pump is arranged on one side of the electromagnetic valve.

[0007] Preferably, a condensate tank is provided in the acid removal skid, and a liquid injection pipe is fixedly connected to a liquid injection distributor in the condensate tank, and a plurality of nozzles are arranged at equal distances below the liquid injection distributor.

[0008] Preferably, a foam coalescing net is arranged on one side of the condensate tank close to the liquid injection distributor, and spoilers are arranged in an equidistant and staggered manner in the condensate tank.

[0009] Preferably, pipes are installed on the outer wall of the acid removal skid, and two groups of pipes are symmetrically arranged, and the pipes are respectively located on the upper and lower sides of the acid removal skid.

[0010] Preferably, a control valve is provided on one side of the pipeline, the pipeline is connected to a condensate tank level gauge via a control valve flange, and a drain valve is provided below the condensate tank level gauge.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The device installs a horizontal deacidification skid in front of the No. 1 elbow of the volatile line to deacidify part of the oil and gas on the top of the fractionation tower. Before the gas phase returns to the heat exchanger, the liquid phase enters the reflux tank for liquid separation, and the gas is injected into the deacidification skid through the gas injection pipe. The gas will react with the moderator and neutralizer of the liquid injection pipe through the pipeline. The liquid injection pipe injects the liquid into the condensate tank and evenly distributes it through the liquid injection distributor. The nozzle sprays the liquid on the gas flow path to further remove the acidic components in the gas. In the condensate tank, the foam coalescing net further separates the foam in the gas and liquid mixture. The foam coalescing net helps to improve the separation efficiency of the liquid by promoting the aggregation and rupture of the foam, so that the liquid and gas can be separated more effectively, thereby reducing the content of the acidic components and ensuring the stability and efficiency of the system.

[0013] 2. The acid removal skid is connected to a condensate tank level gauge through a pipeline flange, and a control valve is provided between the condensate tank level gauge and the pipeline to monitor and control the liquid level of the condensate inside the acid removal skid. The feedback signal of the condensate tank level gauge is used to ensure the normal operation of the equipment. A drain valve is provided below the condensate tank level gauge to regularly remove dirt and sediment from the condensate tank.

[0014] 3. The treated liquid phase is pumped to the reflux pipe and enters the reflux tank for further liquid separation to ensure that the liquid is properly treated. The gas phase treated by the multi-stage spoiler returns to the heat exchanger through the exhaust pipe for subsequent treatment or recycling, which improves the overall treatment efficiency of the system. The device effectively reduces the acid content through the above measures, ensures the efficient separation of gas and liquid, and maintains the stability and operation efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a stereoscopic diagram of a volatile line anti-corrosion device at the top of a distillation tower proposed by the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of a volatile line anti-corrosion device at the top of a distillation tower proposed by the present invention.

[0017] In the figure: 1. Acid removal skid; 2. Liquid injection pipe; 3. Connecting flange; 4. Exhaust pipe; 5. Gas injection pipe; 6. Tower top; 7. Pipeline; 8. Condensate tank level gauge; 9. Control valve; 10. Acid discharge pipe; 11. Liquid injection distributor; 12. Foam coalescing net; 13. Spoiler; 14. Condensate tank; 15. Water pump; 16. Drain valve; 17. Solenoid valve; 18. Reflux pipe; 19. Pipeline. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] like Figure 1-Figure 2 As shown, the present invention proposes a volatile line anti-corrosion equipment for the top of a distillation tower, comprising an acid removal skid 1 and a tower top 6, wherein an air injection pipe 5 is embedded on the left side of the acid removal skid 1, and an acid discharge pipe 10 is embedded on the side of the acid removal skid 1 away from the air injection pipe 5, and an injection pipe 2 and an exhaust pipe 4 are respectively arranged on the left and right sides of the upper surface of the acid removal skid 1, and a connecting flange 3 is arranged on one side of the air injection pipe 5, the acid discharge pipe 10, the injection pipe 2 and the exhaust pipe 4, one side of the pipeline 19 is perforated for drainage and the acid removal skid 1 is installed, and one end of the pipeline 19 is fixedly connected to the tower top 6, the acid discharge pipe 10 is movably connected to a reflux pipe 18 through the connecting flange 3, and the side of the reflux pipe 18 away from the acid discharge pipe 10 is connected to an external top reflux tank, an electromagnetic valve 17 is arranged between the acid discharge pipe 10 and the top reflux tank, and a water pump 15 is arranged on one side of the electromagnetic valve 17 of the reflux pipe 18.

[0020] In an optional embodiment, a condensate tank 14 is provided in the acid removal skid 1, and an injection pipe 2 is fixedly connected to an injection distributor 11 in the condensate tank 14, and a plurality of nozzles are arranged at equal distances below the injection distributor 11; the injection pipe 2 injects liquid into the condensate tank 14, and the liquid is evenly distributed through the injection distributor 11, and the nozzle sprays the liquid on the gas flow path to further remove the acidic components in the gas.

[0021] In an optional embodiment, a foam coalescing net 12 is provided on one side of the condensate tank 14 close to the liquid injection distributor 11, and spoilers 13 are equidistantly and staggeredly provided in the condensate tank 14; the foam coalescing net 12 further separates the foam in the gas and liquid mixture, and the foam coalescing net 12 helps to improve the separation efficiency of the liquid by promoting the aggregation and rupture of the foam, so that the liquid and gas can be separated more effectively, thereby reducing the content of the acidic components and ensuring the stability and efficiency of the system.

[0022] In an optional embodiment, pipes 7 are installed on the outer wall of the acid removal skid 1 , and two groups of pipes 7 are symmetrically arranged, and the pipes 7 are respectively located on the upper and lower sides of the acid removal skid 1 .

[0023] In an optional embodiment, a control valve 9 is provided on one side of the pipeline 7, and the pipeline 7 is flange-connected to a condensate tank level gauge 8 through the control valve 9, and a drain valve 16 is provided below the condensate tank level gauge 8; the deacidification skid 1 is flange-connected to a condensate tank level gauge 17 through the pipeline 7, and a control valve 9 is provided between the condensate tank level gauge 17 and the pipeline 7, which can monitor and control the liquid level of the condensate inside the deacidification skid 3. The opening of the control valve 9 can be automatically controlled through the feedback signal of the condensate tank level gauge, so as to achieve precise regulation of the condensate discharge, thereby effectively avoiding the accumulation and overflow of condensate in the deacidification skid 3 and ensuring the normal operation of the equipment. A drain valve 16 is provided below the condensate tank level gauge 17, which is used to regularly remove dirt and sediment in the condensate tank 14.

[0024] The working principle of the present invention is as follows: when in use, the device installs a horizontal deacidification skid 1 by drilling holes for drainage in front of the first elbow of the volatile line to deacidify part of the oil and gas on the top of the distillation tower. Before the gas phase returns to the heat exchanger, the liquid phase enters the reflux tank for liquid separation, and the gas is injected into the deacidification skid 1 through the gas injection pipe 5. The gas will react with the moderator and neutralizer of the liquid injection pipe 2 through the pipeline. The liquid injection pipe 2 injects the liquid into the condensate tank 14, which is evenly distributed through the liquid injection distributor 11. The nozzle sprays the liquid on the gas flow path to further remove the acidic components in the gas. In the condensate tank 14, the foam coalescing net 12 further separates the foam in the gas and liquid mixture. The foam coalescing net 12 helps to improve the separation efficiency of the liquid by promoting the aggregation and rupture of the foam, so that the liquid and gas can be separated more effectively, thereby reducing the content of the acidic components and ensuring To ensure the stability and efficiency of the system, the liquid phase after the reaction is completed is gathered in the condensate tank 14. The deacidification skid 1 is connected to the condensate tank level gauge 17 through the pipeline 7 flange, and a control valve 9 is arranged between the condensate tank level gauge 17 and the pipeline 7, which can monitor and control the liquid level of the condensate inside the deacidification skid 3. The feedback signal of the condensate tank level gauge is used to ensure the normal operation of the equipment. A drain valve 16 is arranged below the condensate tank level gauge 17 to regularly remove the dirt and sediment in the condensate tank 14. The liquid phase in the deacidification skid 1 is transported to the reflux pipe 18 through the water pump 15 and enters the reflux tank for liquid separation treatment. The gas phase is treated by the multi-stage spoiler 13 and then returned to the heat exchanger through the exhaust pipe 4 for subsequent treatment or recovery. The device ensures the efficient separation of gas and liquid and the effective removal of acidic components, thereby maintaining the stability and efficiency of the system.

[0025] It should be understood that the above specific embodiments of the present invention are used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A fractionation tower top volatile line anti-corrosion equipment, characterized in that: The invention comprises an acid removal skid (1) and a tower top (6), wherein an air injection pipe (5) is embedded on the left side of the acid removal skid (1), an acid discharge pipe (10) is embedded on the side of the acid removal skid (1) away from the air injection pipe (5), a liquid injection pipe (2) and an exhaust pipe (4) are respectively disposed on the left and right sides of the upper surface of the acid removal skid (1), and a connecting flange (3) is disposed on one side of the air injection pipe (5), the acid discharge pipe (10), the liquid injection pipe (2) and the exhaust pipe (4), and the pipeline (19 ) is perforated and drained on one side and an acid removal skid (1) is installed, and one end of a pipeline (19) is fixedly connected to a tower top (6), an acid discharge pipe (10) is movably connected to a reflux pipe (18) via a connecting flange (3), a side of the reflux pipe (18) away from the acid discharge pipe (10) is connected to an external top reflux tank, an electromagnetic valve (17) is provided between the acid discharge pipe (10) and the top reflux tank, and a water pump (15) is provided on one side of the electromagnetic valve (17) of the reflux pipe (18).

2. The anti-corrosion equipment for the volatile line at the top of a fractionating tower according to claim 1, characterized in that: The deacidification skid (1) is provided with a condensate tank (14), the injection pipe (2) is fixedly connected to an injection distributor (11) in the condensate tank (14), and a plurality of nozzles are arranged at equal distances below the injection distributor (11).

3. A fractionation tower top volatile line anti-corrosion equipment according to claim 2, characterized in that: A foam coalescing net (12) is arranged on one side of the condensate tank (14) close to the liquid injection distributor (11), and spoilers (13) are arranged in an equidistant and staggered manner in the condensate tank (14).

4. The anti-corrosion equipment for the volatile line at the top of a fractionating tower according to claim 1, characterized in that: Pipes (7) are installed on the outer wall of the acid removal skid (1), and two groups of pipes (7) are symmetrically arranged. The pipes (7) are respectively located on the upper and lower sides of the acid removal skid (1).

5. A fractionation tower top volatile line anti-corrosion equipment according to claim 4, characterized in that: A control valve (9) is provided on one side of the pipeline (7), the pipeline (7) is flange-connected to a condensate tank level gauge (8) via the control valve (9), and a drain valve (16) is provided below the condensate tank level gauge (8).

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