Fractionating tower top oil gas deacidification and corrosion prevention device
By installing acid removal skids and condensate tank level meters on the top of the fractionation tower, the equipment corrosion problems caused by corrosive media on the top of the tower are solved, effective acid removal treatment and system working conditions are achieved, and the tower is avoided Top contamination and equipment leakage.
Patent Information
- Application Number
- CN202411397976.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-01-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Corrosive media on the top of the fractionation tower leads to equipment corrosion and leakage. Traditional anti-corrosion measures cannot effectively solve the corrosion problem of the tower top system. Especially in the case of inferior crude oil, corrosion of the tower top low temperature system intensifies, frequently causing heat exchanger leakage failure.
Design a de-acid removal and corrosion prevention device for oil and gas on the top of the fractionation tower, including the top flange, acid removal skid assembly, liquid phase extraction tube, anti-condensation return tower baffle, liquid injection tube and spray head, and evenly distribute liquid through the spray head to suppress ammonia Salt scales, dilutes acid, improves pH, and monitors and controls the condensate level through the condensate tank level gauge to achieve precise regulation and avoids condensate accumulation and overflow.
It effectively suppresses corrosion under scale, prevents corrosive media from contaminating the system, improves the system working conditions, ensures the normal operation of the equipment, improves the acid removal effect, prevents pollution on the top of the tower, and extends the equipment life.
Smart Images
Figure CN119264934A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of deacidification of a fractionating tower, and in particular to an oil and gas deacidification and anti-corrosion device at the top of a fractionating tower. Background Art
[0002] A fractionating tower is a tower-type vapor-liquid device for distillation, commonly used in petrochemical and coal chemical refining. The mixture of gas and liquid phases at the top of the fractionating tower (naphtha hydrogenation, diesel hydrogenation, wax oil hydrogenation and residue oil hydrogenation, etc.) contains a large amount of hydrogen sulfide, ammonia acid and alkaline gases, as well as corrosive media such as ammonium sulfide salts, chloride salts, and ferrous sulfide. Ammonium salts are easy to crystallize and will adhere to the inner tube wall. In the long-term production process, they will 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] However, 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. Traditional anti-corrosion measures cannot effectively solve the corrosion of the tower top system. Therefore, in order to solve the above problems, this application proposes a deacidification and anti-corrosion device for oil and gas at the top of a fractionating tower. Summary of the invention
[0005] The present invention provides a device for removing acid and preventing corrosion of oil and gas at the top of a fractionating tower, so as to solve the technical problems existing in the background technology.
[0006] In order to solve the above problems, the present invention proposes an acid removal and anti-corrosion device for oil and gas at the top of a distillation tower, comprising a distillation tower body and an acid removal skid, characterized in that a top flange is installed on the top of the distillation tower body, and the acid removal skid is installed on the distillation tower body through the top flange, a liquid phase extraction pipe is fixedly connected to the side wall of the acid removal skid, an anti-condensate return baffle is fixedly connected to the bottom end of the inside of the acid removal skid, two fixed rods are fixedly connected to the inner wall of the acid removal skid, a bubble plate is fixedly connected between the two fixed rods, an injection pipe is fixedly connected to the outer wall of the acid removal skid, and one end of the injection pipe passes through the inside of the acid removal skid and is fixedly connected to an injection distributor, and a plurality of nozzles are arranged on the injection distributor.
[0007] Preferably, a first pipeline is installed on the outer side wall of the acid removal skid, and the first pipeline is connected to a first control valve via a flange, and the first control valve is connected to a condensate tank level gauge via a flange.
[0008] Preferably, a second pipeline is installed on the outer side wall of the acid removal skid, and the second pipeline is located below the first pipeline. The second pipeline is connected to a second control valve via a flange, and the second control valve is connected to a condensate tank level gauge via a flange.
[0009] Preferably, a connecting flange is installed on the top of the acid removal skid, and the acid removal skid is connected to a volatile line pipeline via the connecting flange.
[0010] The above technical solution of the present invention has the following beneficial technical effects:
[0011] 1. The present invention installs an acid removal skid at the first elbow of the volatilization line and the top flange of the fractionation tower to remove acid from the oil and gas at the top of the fractionation tower. The gas phase after deacidification is heat exchanged according to the original process, air-cooled and fed into the reflux tank for liquid separation, and the liquid phase acid water and oil phase directly enter the reflux tank without causing pollution to the entire top section. Liquid agent is injected into the acid removal skid through the injection pipe and the injection distributor, and the liquid is evenly distributed through the nozzle to inhibit ammonia salt scaling, avoid the generation of under-scale corrosion, and dilute the acid solution in the primary condensation zone to increase the pH value of the primary condensation zone. The condensed liquid phase is gathered in the condensate tank, and the condensed liquid phase is prevented from returning to the atmospheric pressure tower by setting a baffle to prevent the condensate from returning to the tower. The device controls corrosion from the source, and the corrosive medium does not cause secondary pollution to the system, effectively improving the system working condition;
[0012] 2. The present invention monitors and controls the liquid level of the condensate inside the acid removal skid by connecting a condensate tank level gauge to the first control valve and the second control valve. The opening of the first valve and the second valve can be automatically controlled through the feedback signal of the level gauge to achieve precise regulation of condensate discharge, thereby effectively avoiding accumulation and overflow of condensate in the acid removal skid and ensuring the normal operation of the equipment. The condensate can be extracted through the liquid phase extraction pipe at the bottom of the condensate tank to improve the acid removal effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a stereoscopic diagram of a device for removing acid and preventing corrosion of oil and gas at the top of a distillation tower proposed by the present invention.
[0014] Figure 2 This is a schematic structural diagram of a device for removing acid and preventing corrosion of oil and gas at the top of a distillation tower proposed by the present invention.
[0015] Figure numerals: 1. distillation tower body; 2. tower top flange; 3. acid removal skid; 4. connecting flange; 5. volatile line pipeline; 6. liquid phase extraction pipe; 7. baffle to prevent condensate from returning to the tower; 8. fixing rod; 9. bubble cap plate; 10. injection pipe; 11. injection distributor; 12. nozzle; 13. first pipeline; 14. first control valve; 15. second pipeline; 16. second control valve; 17. condensate tank level gauge. DETAILED DESCRIPTION
[0016] 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.
[0017] like Figure 1-2 As shown, the present invention proposes a deacidification and anti-corrosion device for oil and gas at the top of a fractionating tower, comprising a fractionating tower body 1 and an acid-removing skid 3, characterized in that a top flange 2 is installed on the top of the fractionating tower body 1, an acid-removing skid 3 is installed on the fractionating tower body 1 through the top flange 2, a connecting flange 4 is installed on the top of the acid-removing skid 3, a volatile line pipeline 5 is connected to the acid-removing skid 3 through the connecting flange 4, a liquid phase extraction pipe 6 is fixedly connected to the side wall of the acid-removing skid 3, an anti-condensate return baffle 7 is fixedly connected to the bottom end of the inside of the acid-removing skid 3, two fixing rods 8 are fixedly connected to the inner wall of the acid-removing skid 3, a bubble cap plate 9 is fixedly connected between the two fixing rods 8, and a condensate return baffle 7 is fixedly connected to the outer wall of the acid-removing skid 3. A liquid injection pipe 10 is fixedly connected, and one end of the liquid injection pipe 10 passes through the inside of the acid removal skid 3 and is fixedly connected to a liquid injection distributor 11, and a plurality of nozzles 12 are arranged on the liquid injection distributor 11. The device removes acid from the oil and gas at the top 1 of the distillation tower by installing the acid removal skid 3 at the No. 1 elbow of the volatile line and the flange 2 of the top of the distillation tower. After deacidification, the gas phase is heat exchanged and air-cooled into the reflux tank for liquid separation according to the original process, and the liquid phase acidic water and oil phase directly enter the reflux tank, which does not cause pollution to the entire top section of the tower. In addition, during the treatment process, there is great operational flexibility. After the liquid phase enters the reflux tank and the water pump is cut off, a sampling port is added. At this time, the treatment ratio of the corrosive medium can be achieved by adjusting the water volume and ammonia concentration of the injection.
[0018] In an optional embodiment, a first pipeline 13 is installed on the outer wall of the acid removal skid 3, and the first pipeline 13 is connected to a first control valve 14 through a flange, and the first control valve 14 is connected to a condensate tank level gauge 17 through a flange. A second pipeline 15 is installed on the outer wall of the acid removal skid 3, and the second pipeline 15 is located below the first pipeline 13, and the second pipeline 15 is connected to a second control valve 16 through a flange, and the second control valve 16 is connected to the condensate tank level gauge 17 through a flange. By connecting the condensate tank level gauge 17 to the first control valve 14 and the second control valve 16, the liquid level of the condensate inside the acid removal skid 3 can be monitored and controlled, and the opening of the first valve and the second valve can be automatically controlled through the feedback signal of the level gauge, so as to achieve precise regulation of the condensate discharge, thereby effectively avoiding the accumulation and overflow of condensate in the acid removal skid 3 and ensuring the normal operation of the equipment. The condensate can be extracted through the liquid phase extraction pipe 6 at the bottom of the condensate tank, thereby improving the acid removal effect.
[0019] The working principle of the present invention is as follows: when in use, the device performs deacidification treatment on the oil and gas at the top 1 of the fractionation tower by installing the deacidification skid 3 at the first elbow of the volatilization line and the top flange 2 of the fractionation tower. The gas phase after deacidification is heat exchanged according to the original process, air-cooled and enters the reflux tank for liquid separation, and the liquid phase acidic water and oil phase directly enter the reflux tank without causing pollution to the entire top section of the tower. The liquid agent is injected into the deacidification skid 3 through the injection pipe 10 and the injection distributor 11, and the liquid is evenly distributed through the nozzle 12. The gas phase at the top of the atmospheric and vacuum tower is mixed with the liquid agent evenly sprayed from the injection distributor 11 through the bubble plate 9, so as to achieve the purpose of controlling and adjusting the position of the initial condensation zone, inhibiting the scaling of ammonia salts, avoiding the generation of under-scale corrosion, and diluting the acid solution in the initial condensation zone to increase the pH value of the initial condensation zone. The condensed liquid phase is gathered in the condensate tank, and the condensate phase is prevented from returning to the atmospheric tower by the setting of the anti-condensate return baffle 7. The level meter 17 is connected to the first control valve 14 and the second control valve 16, and can monitor and control the liquid level of the condensate inside the acid removal skid 3. The feedback signal of the level meter can automatically control the opening of the first valve and the second valve to achieve precise regulation of the condensate discharge, thereby effectively avoiding the accumulation and overflow of the condensate in the acid removal skid 3 and ensuring the normal operation of the equipment. The condensate can be extracted through the liquid phase extraction pipe 6 at the bottom of the condensate tank to improve the acid removal effect. The device can control the corrosion from the source and pre-treat the rising oil and gas, and remove the corrosive components in time, thereby protecting the downstream equipment such as the distillation tower from corrosion, and preventing these substances from returning to the inside of the distillation tower to cause secondary pollution to the system, effectively improving the system working conditions. During the treatment process, there is great operational flexibility. After the liquid phase enters the reflux tank and cuts the water pump, a sampling port is added. At this time, the treatment ratio of the corrosive medium can be achieved by adjusting the water volume and ammonia concentration of the injected liquid.
[0020] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0021] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A device for removing acid and corrosion of oil and gas at the top of a fractionating tower, comprising a fractionating tower body (1) and a deacidifying skid (3), characterized in that: The top of the distillation tower body (1) is provided with a tower top flange (2), and the distillation tower body (1) is provided with an acid removal skid (3) through the tower top flange (2); a liquid phase extraction pipe (6) is fixedly connected to the side wall of the acid removal skid (3); an anti-condensate return baffle (7) is fixedly connected to the bottom end of the inside of the acid removal skid (3); two fixed rods (8) are fixedly connected to the inner wall of the acid removal skid (3); a bubble cap plate (9) is fixedly connected between the two fixed rods (8); an injection pipe (10) is fixedly connected to the outer wall of the acid removal skid (3); one end of the injection pipe (10) passes through the inside of the acid removal skid (3) and is fixedly connected to an injection distributor (11); and a plurality of nozzles (12) are arranged on the injection distributor (11).
2. A device for removing acid and corrosion of oil and gas at the top of a fractionating tower according to claim 1, characterized in that: A first pipeline (13) is installed on the outer wall of the acid removal skid (3), and the first pipeline (13) is connected to a first control valve (14) via a flange, and the first control valve (14) is connected to a condensate tank level gauge (17) via a flange.
3. The device for removing acid and corrosion of oil and gas from the top of a fractionating tower according to claim 1, characterized in that: A second pipeline (15) is installed on the outer wall of the acid removal skid (3), and the second pipeline (15) is located below the first pipeline (13). The second pipeline (15) is connected to a second control valve (16) via a flange, and the second control valve (16) is connected to a condensate tank level gauge (17) via a flange.
4. The device for removing acid and corrosion of oil and gas from the top of a fractionating tower according to claim 1, characterized in that: A connecting flange (4) is installed at the top of the acid removal skid (3), and the acid removal skid (3) is connected to a volatile line pipeline (5) via the connecting flange (4).