Structure for preventing precipitation of corrosion inhibitor in naphtha hydrogenation equipment

Abstract

The utility model provides a structure is prevented to come out in naphtha hydrogenation equipment, corrosion inhibitor jar has connected pipeline on intercommunication, the corrosion inhibitor jar in corrosion inhibitor is filled with naphtha hydrogenation equipment by connected pipeline to corrosion inhibitor, the outside of corrosion inhibitor jar with the outside of connected pipeline all is provided with heat preservation layer, the bottom of corrosion inhibitor jar is provided with radiant heat structure. Compared with prior art, in the scheme, the corrosion inhibitor jar and the connecting pipeline are heat preserved, and the corrosion inhibitor jar is heated, so that the corrosion inhibitor can maintain a certain temperature, and the paste-shaped substance is not separated out due to the low temperature environment, and the supply is not affected to cause the equipment failure.

Description

Technical Field

[0001] This utility model relates to the field of naphtha hydrogenation technology, and in particular to a structure for preventing the precipitation of corrosion inhibitors in naphtha hydrogenation equipment. Background Technology

[0002] The naphtha hydrotreating unit was designed by the Process Engineering Department and Luoyang Institute of Sinopec Petrochemical Research Institute. The purpose of naphtha hydrotreating is to refine straight-run naphtha from the upstream light hydrocarbon recovery unit and kerosene-hydrotreated naphtha from the kerosene hydrotreating unit, removing harmful impurities such as sulfur, nitrogen, chlorine, arsenic, lead, and copper from the naphtha feedstock and performing fractionation to provide qualified refined naphtha feedstock for subsequent reforming reactions.

[0003] The naphtha hydrotreating unit's stripping tower top feedstock has a high hydrogen sulfide content. To mitigate the corrosive effects of hydrogen sulfide, a corrosion inhibitor injection system is designed. During the naphtha hydrotreating process, this system pumps in corrosion inhibitors to slow down the corrosion caused by hydrogen sulfide.

[0004] Currently designed corrosion inhibitor systems lack insulation and heat tracing structures. In colder seasons, the corrosion inhibitor system may experience low temperatures due to the low ambient temperature. At low temperatures (around -2°C), the corrosion inhibitor will precipitate a paste-like substance (i.e., the effective component of the corrosion inhibitor). This paste-like substance will clog the inlet of the corrosion inhibitor pump, resulting in insufficient supply of the corrosion inhibitor. This will cause the stripping tower top pipeline and equipment to be corroded by wet hydrogen sulfide, which may lead to equipment failure, corrosion leakage and other problems. Summary of the Invention

[0005] This invention provides a structure for preventing corrosion inhibitor precipitation in naphtha hydrogenation equipment, in order to solve the technical problem of equipment failure caused by corrosion inhibitor precipitating into a paste at low temperatures, resulting in insufficient corrosion inhibitor supply.

[0006] This utility model provides a structure for preventing corrosion inhibitor precipitation in naphtha hydrotreating equipment, comprising:

[0007] A corrosion inhibitor tank is provided, and a connecting pipe is connected to the corrosion inhibitor tank. The corrosion inhibitor in the corrosion inhibitor tank is added to the naphtha hydrotreating equipment through the connecting pipe.

[0008] Both the exterior of the corrosion inhibitor tank and the exterior of the connecting pipe are provided with a heat insulation layer.

[0009] The bottom of the corrosion inhibitor tank is equipped with a radiant heating structure.

[0010] In one embodiment of the present invention, a heat tracing structure is provided inside the insulation layer, and the heat tracing structure is used to heat the corrosion inhibitor tank and / or the connecting pipeline.

[0011] In one embodiment of this utility model, the heat tracing structure is a hot water pipeline, which is wrapped around the outside of the corrosion inhibitor tank and the outside of the connecting pipeline.

[0012] In one embodiment of this utility model, the hot water pipeline is connected to the waste hot water pipeline of the naphtha hydrogenation equipment, and waste hot water is introduced into the hot water pipeline, the temperature of which is 90-100℃.

[0013] In one embodiment of the present invention, the radiant heating structure is spaced apart from the bottom of the corrosion inhibitor can, and the radiant heating structure is used to radiate heat to the bottom of the corrosion inhibitor can.

[0014] In one embodiment of the present invention, the radiant heating structure is directly disposed between the bottom of the corrosion inhibitor can and the bottom of the corrosion inhibitor can be heated by conduction and radiation.

[0015] In one embodiment of the present invention, the bottom of the corrosion inhibitor can has a cavity, and the radiant structure is installed in the cavity and close to the part of the corrosion inhibitor can containing the corrosion inhibitor.

[0016] In one embodiment of the present invention, the radiant structure is a steam heating pipeline, and the steam heating pipeline forms a disc-shaped structure along the bottom of the corrosion inhibitor tank.

[0017] In one embodiment of the present invention, the steam pipeline is filled with low-pressure steam of 1.0MPa-1.5MPa.

[0018] In one embodiment of the present invention, a corrosion inhibitor pump is provided on the connecting pipeline, and the corrosion inhibitor pump is used to pump the corrosion inhibitor in the corrosion inhibitor tank into the naphtha hydrogenation equipment.

[0019] The beneficial effects of this utility model are as follows: This utility model proposes a structure to prevent corrosion inhibitor precipitation in naphtha hydrotreating equipment. Through an insulation layer surrounding the corrosion inhibitor tank and connecting pipelines, and a radiant heating structure at the bottom of the corrosion inhibitor tank, the structure insulates the tank and connecting pipelines while simultaneously heating the bottom of the tank. This ensures that the corrosion inhibitor inside maintains a certain temperature even in low-temperature environments, and the tank and connecting pipelines are also kept warm. This prevents the corrosion inhibitor from precipitating into a paste-like substance and clogging the inlet of the corrosion inhibitor pump, ensuring that the corrosion inhibitor can enter the naphtha hydrotreating unit to mitigate the corrosive effects of hydrogen sulfide, thereby preventing leaks and malfunctions in the naphtha hydrotreating unit. Compared with existing technologies, this solution, by insulating the corrosion inhibitor tank and connecting pipelines and heating the tank, maintains a certain temperature for the corrosion inhibitor, preventing the precipitation of a paste-like substance due to low ambient temperatures, which could affect supply and cause equipment failure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of a structure for preventing corrosion inhibitor precipitation in a naphtha hydrogenation device, as an example of this utility model.

[0023] The attached figures are labeled as follows:

[0024] 1. Corrosion inhibitor tank; 2. Base; 3. Connecting pipes; 4. Insulation layer; 5. Corrosion inhibitor pump; 6. Level gauge. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0028] The specific structure of the structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating device according to this utility model is described in conjunction with [see also...]. Figure 1 The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating device includes: a corrosion inhibitor tank 1, a connecting pipe 3 connected to the corrosion inhibitor tank 1, and the corrosion inhibitor in the corrosion inhibitor tank 1 is added to the naphtha hydrotreating device through the connecting pipe 3.

[0029] The corrosion inhibitor tank 1 and the connecting pipe 3 are both provided with a heat insulation layer 4.

[0030] The bottom of the corrosion inhibitor tank 1 is equipped with a radiant heating structure.

[0031] The corrosion inhibitor tank 1 is equipped with two level gauges 6, and the connecting pipeline 3 is equipped with multiple valves.

[0032] Specifically, the insulation layer 4 is used to insulate the corrosion inhibitor tank 1 and the connecting pipe 3. Insulation material can be used to wrap the corrosion inhibitor tank 1 and the connecting pipe 3. The radiant heating structure mainly adopts a structure with heating performance to heat the bottom of the corrosion inhibitor tank 1 through thermal radiation. This heats the corrosion inhibitor tank 1 but avoids excessive temperature, ensuring the corrosion inhibitor reaches a certain temperature (a temperature that will not cause the precipitation of a paste-like substance). Specific radiant heating structures can be heating water pipes or steam pipes, heating rods, etc.; any structure with heating performance is acceptable.

[0033] In practical implementation, a structure in a naphtha hydrotreating unit that prevents corrosion inhibitor precipitation utilizes an insulation layer 4 wrapped around the outside of the corrosion inhibitor tank 1 and the connecting pipeline 3, as well as a heat-radiating structure at the bottom of the corrosion inhibitor tank 1. This insulation layer insulates the corrosion inhibitor tank 1 and the connecting pipeline 3 while simultaneously heating the bottom of the corrosion inhibitor tank 1. This ensures that the corrosion inhibitor inside the tank 1 maintains a certain temperature even in low-temperature environments, and that the interiors of the tank 1 and the connecting pipeline 3 are also insulated. This prevents the corrosion inhibitor from precipitating into a paste-like substance that blocks the inlet of the corrosion inhibitor pump 5, ensuring that the corrosion inhibitor can enter the naphtha hydrotreating unit to mitigate the corrosive effects of hydrogen sulfide, thereby preventing leaks and malfunctions in the naphtha hydrotreating unit.

[0034] In some embodiments, a heat tracing structure is provided within the insulation layer 4, the heat tracing structure being used to heat the corrosion inhibitor tank 1 and / or the connecting pipe 3. The heat tracing structure can heat the corrosion inhibitor tank 1 and the connecting pipe 3, so as to heat the corrosion inhibitor in the corrosion inhibitor tank 1 and the connecting pipe 3.

[0035] In some embodiments, the heat tracing structure is a hot water pipe, which is wound around the outside of the corrosion inhibitor tank 1 and the connecting pipe 3. The hot water pipe has a simple structure and is easy to arrange, enabling simultaneous heating of the corrosion inhibitor tank 1 and the connecting pipe 3. By winding the hot water pipe around the outside of the corrosion inhibitor tank 1 and the connecting pipe 3, it can uniformly heat the corrosion inhibitor inside the tank and pipe. Furthermore, the spacing of the winding of the hot water pipe can be adjusted according to heating requirements to maintain the corrosion inhibitor at the desired temperature.

[0036] In some embodiments, the hot water pipeline is connected to the waste hot water pipeline of the naphtha hydrotreating unit. Waste hot water is introduced into the hot water pipeline, and the temperature of the waste hot water is 90-100℃. The hot water pipeline heats the corrosion inhibitor tank 1 and the connecting pipeline 3 by introducing hot water, which further ensures the temperature of the corrosion inhibitor in the corrosion inhibitor tank 1 and the connecting pipeline 3. Simultaneously, the maximum temperature of the hot water is 100℃, effectively preventing the corrosion inhibitor from being heated above 100℃. In this embodiment, waste hot water generated during the operation of the naphtha hydrotreating unit can be introduced into the hot water pipeline to achieve energy recovery and utilization of the waste hot water, thereby saving certain energy. The temperature of the waste hot water is approximately 95℃.

[0037] In some embodiments, the insulation layer 4 wraps and insulates the exterior of the corrosion inhibitor tank 1 and its external hot water pipes, as well as the exterior of the connecting pipe 3 and its external hot water pipes. For example, Figure 1 As shown, the insulation layer 4 is located outside the hot water pipe. On the one hand, it can insulate the corrosion inhibitor in the corrosion inhibitor tank 1 and the connecting pipe 3, and on the other hand, it can prevent the heat of the hot water pipe from being dissipated quickly.

[0038] In some embodiments, the radiant heating structure is spaced apart from the bottom of the corrosion inhibitor canister 1, and the radiant heating structure is used to radiate heat the bottom of the corrosion inhibitor canister 1. The spaced-apart arrangement of the radiant heating structure and the corrosion inhibitor canister 1 allows for radiant heating of the corrosion inhibitor canister 1, resulting in more uniform heating and preventing the temperature from becoming too high.

[0039] In some embodiments, the radiant heating structure is directly in contact with the bottom of the corrosion inhibitor can 1, and the radiant heating structure is used to conduct and radiate heat the bottom of the corrosion inhibitor can 1. Direct contact between the radiant heating structure and the corrosion inhibitor can 1 enables the radiant heating structure to radiate and conduct heat to the corrosion inhibitor can 1, resulting in a faster heating rate.

[0040] In some embodiments, the bottom of the corrosion inhibitor container 1 has a cavity, and the radiant structure is installed within the cavity and close to the portion of the corrosion inhibitor container 1 containing the corrosion inhibitor. For example, Figure 1 As shown, the bottom of the corrosion inhibitor canister 1 has a base 2, which has a hollow internal structure. A through hole is provided at the bottom of the base 2 to allow the heating structure to extend into the cavity. The structure can then be fixed to the inner wall above the cavity, or close to the inner wall of the corrosion inhibitor canister 1 containing the corrosion inhibitor, using methods such as adhesive bonding or locking. In this embodiment, the heating structure is in direct contact with the corrosion inhibitor canister 1, ensuring the heating rate of the corrosion inhibitor. The separation between the heating structure and the corrosion inhibitor by the canister body of the corrosion inhibitor canister 1 also prevents the heating temperature of the heating structure from becoming too high.

[0041] In some embodiments, the radiant heating structure is a steam heating pipe, which forms a disc-shaped structure along the bottom of the corrosion inhibitor tank 1. The corrosion inhibitor tank 1 is heated by radiant heat transfer through the heat of the steam, preventing the effective components of the corrosion inhibitor from being released. The bottom of the corrosion inhibitor tank 1 has a circular structure, and the disc-shaped steam pipe ensures uniform heating of the bottom of the corrosion inhibitor tank 1, thereby ensuring uniform heating of the corrosion inhibitor.

[0042] In some embodiments, the steam pipeline is supplied with low-pressure steam at 1.0 MPa to 1.5 MPa. This low pressure allows steam to be smoothly introduced into the steam pipeline, ensuring effective heating of the bottom of the corrosion inhibitor tank 1. In practical implementation, using a low-pressure steam supply of 1.3 MPa is more suitable.

[0043] In some embodiments, a corrosion inhibitor pump 5 is provided on the connecting pipeline 3. The corrosion inhibitor pump 5 is used to pump the corrosion inhibitor in the corrosion inhibitor tank 1 into the naphtha hydrotreating equipment. The corrosion inhibitor pump 5 can regulate the flow of the corrosion inhibitor, allowing it to enter the naphtha hydrotreating equipment quickly.

[0044] By combining hot water pipes, insulation layer 4, and steam pipes, the corrosion inhibitor tank 1 and connecting pipes are heated and insulated. In low-temperature environments, the temperature of the corrosion inhibitor can be maintained above 10℃ (based on multiple actual measurements). This temperature ensures that the corrosion inhibitor is in a normal state and that the corrosion inhibitor filling system can operate normally, completely solving the problem of insufficient supply of corrosion inhibitor pump 5 caused by corrosion inhibitor precipitation in low-temperature seasons.

[0045] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating unit, characterized in that: It includes a corrosion inhibitor tank, which is connected to a connecting pipeline, through which the corrosion inhibitor in the corrosion inhibitor tank is added to the naphtha hydrotreating equipment; Both the exterior of the corrosion inhibitor tank and the exterior of the connecting pipe are provided with a heat insulation layer. The bottom of the corrosion inhibitor tank is equipped with a radiant heating structure.

2. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 1, characterized in that: A heat tracing structure is provided inside the insulation layer, which is used to heat the corrosion inhibitor tank and / or the connecting pipeline.

3. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 2, characterized in that: The heat tracing structure is a hot water pipeline, which is wrapped around the outside of the corrosion inhibitor tank and the outside of the connecting pipeline.

4. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 3, characterized in that: The hot water pipeline is connected to the waste hot water pipeline of the naphtha hydrogenation equipment, and waste hot water is introduced into the hot water pipeline. The temperature of the waste hot water is 90-100℃.

5. A structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating unit according to any one of claims 1-4, characterized in that: The radiant heating structure is spaced apart from the bottom of the corrosion inhibitor can, and the radiant heating structure is used to radiate heat to the bottom of the corrosion inhibitor can.

6. A structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating unit according to any one of claims 1-4, characterized in that: The radiant heating structure is directly in contact with the bottom of the corrosion inhibitor can, and the radiant heating structure is used to conduct and radiate heat to the bottom of the corrosion inhibitor can.

7. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 5, characterized in that, The bottom of the corrosion inhibitor can has a cavity, and the radiant structure is installed in the cavity and close to the part of the corrosion inhibitor can containing the corrosion inhibitor.

8. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 7, characterized in that: The radiant structure is a steam heating pipeline, which forms a disc-shaped structure along the bottom of the corrosion inhibitor tank.

9. The structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating equipment according to claim 8, characterized in that: The steam heating pipeline is supplied with low-pressure steam at 1.0MPa-1.5MPa.

10. A structure for preventing corrosion inhibitor precipitation in a naphtha hydrotreating unit according to any one of claims 1-4, characterized in that: A corrosion inhibitor pump is installed on the connecting pipeline, which is used to pump the corrosion inhibitor in the corrosion inhibitor tank into the naphtha hydrotreating equipment.

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