Closed discharge line, flushing replacement line and discharge system of atmospheric and vacuum distillation unit

Abstract

The utility model provides a closed discharge line, a flushing replacement line and a discharge system of an atmospheric and vacuum distillation unit, a distillation unit comprises a first container, a second container, a first machine pump and a first pipeline communicated with the first container and the second container, and wastewater of the distillation unit enters the second container from the first container through the first machine pump along the first pipeline to be treated; the closed discharge line is arranged between the first container and the outlet of the first machine pump in a communicating manner and forms a second pipeline which flows back to the first container from the first machine pump. According to the distillation device, the closed discharge line is additionally arranged on the discharge pipeline of the sewage pump outlet of the first container and / or the third container of the distillation device and is connected to the first container or the third container, so that residual liquid in the sewage pump is discharged into the first container or the third container through the closed discharge line in the maintenance process of the sewage pump; the safety risk of operators is effectively reduced, and the safety and environmental protection problems caused by pollution due to the mode that the gas is discharged to the floor drain are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a closed discharge line, a flushing replacement line and a discharge system of a normal and low pressure distillation device. Background Art

[0002] The petrochemical closed discharge line is a system that collects, treats and discharges pollutants such as waste gas and wastewater generated in the petrochemical production process. The purpose of this system is to protect the environment, reduce the open discharge of pollutants, and ensure that the production process meets safety and environmental protection requirements. However, the pumps in the sewage discharge pipeline in the chemical pipeline currently have the following problems during maintenance.

[0003] 1. The sulfur-containing wastewater at the top of the vacuum tower of the atmospheric distillation unit comes from the condensate of the vacuum system of the top reduction. The condensate contains pollutants such as hydrogen sulfide, ammonia, phenol, cyanide and oil. The condensate first enters the top reduction water separation tank. The sulfur-containing wastewater separated from the top reduction water separation tank is sent to the acid water stripping unit for further treatment through the sulfur-containing wastewater pump.

[0004] There are two sulfur-containing sewage pumps at the top of the atmospheric and vacuum distillation unit. When the pump fails and needs to be repaired, the residual liquid in the top-reducing sulfur-containing sewage pump needs to be discharged into the oily sewage floor drain. Since the residual liquid in the pump is sulfur-containing sewage, the medium is rich in odorous and highly toxic substances such as hydrogen sulfide. Discharging through the floor drain brings certain safety risks to the operators, and also pollutes the oily sewage system, which cannot meet environmental protection requirements.

[0005] 2. In the light hydrocarbon recovery system of the atmospheric and vacuum distillation unit, the lean liquid used for desulfurization of the liquefied gas desulfurization part comes from the solvent regeneration part of the sulfur recovery unit, enters the lean amine liquid buffer tank, and is pressurized by the lean amine liquid pump and sent to the liquefied gas desulfurization tower. The rich liquid after desulfurization flashes out the hydrocarbons carried by the rich liquid flash tank, and is sent to the solvent regeneration part of the sulfur recovery unit by the rich amine liquid pump for regeneration and recycling.

[0006] There are a total of 2 lean amine liquid pumps and 2 rich amine liquid pumps in the light hydrocarbon recovery system. When the pump fails and needs to be repaired, the residual liquid in the lean amine liquid pump and the rich amine liquid pump is discharged to the discharge port before the repair. If it is discharged to the outside through the floor drain type discharge port, it will bring certain safety risks to the operators and also pollute the oily wastewater system, which cannot meet environmental protection requirements.

[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0008] In view of the shortcomings of the prior art mentioned above, the utility model provides a closed discharge line, a flushing and replacement line and a discharge system for a normal and low pressure distillation device. A closed discharge line is added to the discharge pipeline of the sewage pump outlet of the first container and / or the third container of the distillation device and connected to the first container or the third container, so that during the sewage pump maintenance process, the residual liquid therein is discharged into the first container or the third container through the closed discharge line, so that the safety risk of the operating personnel is effectively reduced, so as to solve the safety and environmental protection problems caused by pollution caused by external discharge to the floor drain.

[0009] The utility model provides a closed discharge line of a normal and low pressure distillation device, wherein the distillation device comprises a first container, a second container, a first machine pump and a first pipeline connected therebetween, and waste water of the distillation device enters the second container from the first container via the first machine pump along the first pipeline for treatment; the closed discharge line is connected and arranged between the first container and the outlet of the first machine pump, and forms a second pipeline that refluxes from the first machine pump to the first container.

[0010] In one embodiment of the present invention, the first pipeline includes a discharge pipeline connected to the discharge port, the second pipeline is connected to the discharge pipeline, and a stop valve is disposed on the discharge pipeline between the second pipeline and the discharge port.

[0011] In one embodiment of the present invention, the grouped first pumps divide the first pipeline connected to the first container to each first pump, and merge the first pipeline and the second pipeline connected to each first pump into the second container and the first container respectively.

[0012] In one embodiment of the utility model, a plurality of condensate discharge ports are arranged on the second pipeline, the condensate discharge ports are respectively located on a side close to the first pipeline and a side close to the first container, and blind covers are arranged on the condensate discharge ports.

[0013] In one embodiment of the utility model, the distillation device also includes a third container, a fourth container, a second pump and a first pipeline connected therebetween. The waste water of the distillation device enters the second container from the first container via the first pump along the first pipeline for treatment, then enters the third container from the second container, and enters the fourth container from the third container via the second pump along the first pipeline for treatment; a closed discharge line is connected and arranged between the third container and the first pump outlet and the second pump outlet, and forms a third pipeline that refluxes from the first pump and the second pump to the third container.

[0014] In one embodiment of the utility model, the first pumps arranged in groups make the first pipeline connected to the first container branch to each first pump, and make the first pipeline and the second pipeline connected to each first pump merge to the second container and the third container respectively;

[0015] The second pumps arranged in groups make the first pipeline connected to the first container branch to each second pump, and make the first pipeline and the second pipeline connected to each second pump merge to the fourth container and the third container respectively.

[0016] In one embodiment of the utility model, a plurality of condensate discharge ports are provided on the second pipeline, the condensate discharge ports are respectively located on both sides of the one-way valve on the second pipeline, and blind covers are provided on the condensate discharge ports.

[0017] The utility model also provides a flushing and replacement line of a normal and low pressure distillation device. The flushing and replacement line is arranged in the above distillation device and is connected with a first pipeline at the inlet of a first pump and a second pump. A stop valve and a blind plate are arranged on the pipeline of the flushing and replacement line.

[0018] In one embodiment of the present invention, the flushing and replacement line is provided with production water and demineralized water.

[0019] The utility model further provides a discharge system of a atmospheric and vacuum distillation device, comprising the above-mentioned closed discharge line and flushing and replacement line.

[0020] The beneficial effects of the utility model are as follows:

[0021] 1. The closed discharge line, flushing and replacement line and discharge system of the atmospheric and vacuum distillation device provided by the utility model optimize and transform the closed discharge system of the sulfur-containing sewage pump, add a closed discharge line to the water tank at the outlet of the sulfur-containing sewage pump to discharge oily sewage, add a flushing and replacement water line after the pump inlet valve, and replace the residual toxic medium in the pump into the water tank by clean production water, so that the entire pump replacement process is fully closed, without any medium discharge and no odor. The pump to be repaired has no medium discharge during the process treatment, and the safety and environmental protection risks of operation are greatly reduced.

[0022] 2. Through technical transformation of the discharge process of the lean amine pump and rich amine pump of the atmospheric and vacuum distillation unit, a deionized water line is added from the inlet pipeline of the water wash pump to the inlet of the lean amine pump and the rich amine pump, and a closed discharge line is added from the outlet of the lean amine pump and the rich amine pump to the discharge port to the rich liquid flash tank. The residual liquid is discharged to the rich liquid flash tank and then sent to the solvent regeneration unit of the sulfur recovery unit for regeneration and recycling. The closed discharge of the medium before the machine pump is overhauled is realized. The machine pump to be overhauled is realized without the discharge of the medium during the process disposal, and the safety and environmental protection risks of the operation are greatly reduced.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 It is a schematic diagram of the pipeline in the closed discharge system of the top-reduced sulfur-containing sewage pump in one embodiment of the utility model;

[0026] Figure 2 The utility model is a schematic diagram of the pipelines in the discharge system of the lean amine liquid pump and the rich amine liquid pump of the atmospheric and vacuum distillation device according to another embodiment. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementations, rather than to limit the scope of protection of the present invention.

[0028] See also Figure 1 to Figure 2 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any structural modification, change in proportional relationship, or adjustment of size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as position and quantitative relationship quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantial changes in the technical content.

[0029] See also Figure 1The utility model provides a closed discharge line of a normal and low pressure distillation device, wherein the distillation device comprises a first container, a second container, a first pump and a first pipeline connected therebetween, and waste water of the distillation device enters the second container from the first container via the first pump along the first pipeline for treatment; the closed discharge line is connected and arranged between the first container and the outlet of the first pump, and forms a second pipeline that refluxes from the first pump to the first container.

[0030] Furthermore, the first pipeline includes a discharge pipeline connected to the discharge port, the second pipeline is connected to the discharge pipeline, and a stop valve is arranged on the discharge pipeline between the second pipeline and the discharge port.

[0031] Specifically, in the atmospheric and vacuum distillation device pipeline of an embodiment of the present invention, the closed discharge system of the sulfur-containing sewage pump at the top of the vacuum tower is optimized and modified. In the original pipeline, please refer to the attached Figure 1 The black line in the figure shows the pipeline part. The sulfur-containing wastewater at the top of the vacuum tower comes from the condensate of the vacuum system at the top of the vacuum tower. The condensate contains pollutants such as hydrogen sulfide, ammonia, phenol, cyanide and oil. The condensate first enters the top reduction water separation tank V-0701 (i.e. the first container). The sulfur-containing wastewater separated from the top reduction water separation tank V-0701 is sent to the acid water stripping device (i.e. the second container) by the top reduction sulfur-containing wastewater pump P-0707A / B (i.e. the first pump) for further treatment.

[0032] For more details, please see the attached Figure 1 The red line in the figure shows the pipeline part. A closed discharge line (i.e., the second pipeline) is added to the pipeline that discharges the oily wastewater from the outlet of the sulfur-containing wastewater pump at the top of the pressure reducing tower (i.e., the discharge pipeline) and connected to the water diversion tank at the top of the pressure reducing tower. During the maintenance of the first pump, the residual liquid in it can be discharged into the water diversion tank through the closed discharge line instead of discharging to the floor drain. This effectively reduces the safety risks of operating personnel and avoids safety and environmental problems caused by pollution.

[0033] Furthermore, for the specific position where the closed discharge line is connected to the existing first pipeline, it is only necessary to connect to the pipeline after the outlet of the first pump and before the inlet of the second container, such as the discharge pipeline. At the same time, a stop valve needs to be set between the position where the closed discharge line is connected to the discharge pipeline and the discharge port at the end of the discharge pipeline. By closing the closed discharge line when using the closed discharge line, sulfur-containing wastewater can be prevented from flowing along the discharge pipeline into the floor drain of the discharge port.

[0034] See also Figure 1 In one embodiment, the utility model further provides a flushing and replacement line of the atmospheric and vacuum distillation device, which is arranged in the above-mentioned distillation device and is connected to the first pipeline at the inlet of the first pump, and a stop valve and a blind plate are arranged on the pipeline of the flushing and replacement line. The flushing and replacement line provides production water.

[0035] In this way, a closed discharge line is added from the outlet of the oily sewage discharge line of the top-reducing sulfur-containing sewage pump P-0707A / B to the top-reducing water distribution tank, and a flushing replacement water line is added after the pump inlet valve. The process disposal operation method steps for the pump overhaul after the modification are as follows: (where [P] before the step means that this step is an external and on-site operation step, and (P) means that this step is an internal operation, that is, it is operated through the control system)

[0036] [P]-Operators can only start working after receiving instructions and making relevant preparations and wearing labor protection;

[0037] [P] - Internal and external operation contact, press the cold centrifugal pump switching operation card to shut down the pump that needs maintenance;

[0038] [P]-Close the inlet valve and outlet valve of the pump;

[0039] (P)-Contact the internal operator to confirm that the production water pressure is greater than 0.3MPa;

[0040] [P]-Change the closed sewage discharge process of the on-site pump;

[0041] [P] - Open the inlet production water line;

[0042] [P]-Slowly open the drain valve and make sure the drain speed is not too fast;

[0043] [P]- Visual inspection shows that the medium is qualified if there is no oil stain or odor;

[0044] [P]-After the discharge is completed, if any valve is found to be loose, add a blind plate for isolation and hang a blind plate sign;

[0045] [P]-Site cleaning;

[0046] (P)-Confirm that the pump chamber pressure returns to zero;

[0047] (P)-Confirm that no medium flows out of the pump discharge port;

[0048] [P]-Contact the electrician to cut off the power supply to the pump distribution room;

[0049] [P]-Contact the equipment professionals, energy isolation is completed, and the conditions for maintenance are met;

[0050] [P]- In winter, the water in the newly equipped closed sewage pipeline must be drained;

[0051] [P]- Nitrogen replacement is performed on the newly equipped closed sewage pipeline. The oxygen content is less than 0.5% (v / v) and it is qualified; nitrogen pressure is maintained after the replacement is qualified;

[0052] [P]-Report to the internal operation department that the work has been completed and keep relevant records.

[0053] Furthermore, the first pumps arranged in groups allow the first pipeline connected to the first container to be split to each first pump, and allow the first pipeline and the second pipeline connected to each first pump to be merged to the second container and the first container respectively.

[0054] Specifically, the pumps in chemical pipelines usually require redundant settings to ensure the stable operation of the pipeline system. In this way, the first pumps are arranged in groups, for example, one for use and one for backup or one for use and two for backup, to prevent the normal operation of the pipeline from being affected by the failure of a single first pump. At the same time, it is also possible to repair a single first pump without interrupting the operation of the entire pipeline.

[0055] Furthermore, the second pipeline is provided with a plurality of condensate discharge ports, which are respectively located on the side close to the first pipeline and the side close to the first container, and a blind cover is provided on the condensate discharge port. In this way, the condensate discharge port and the blind cover are used to discharge the medium and water that cannot be discharged at the low dead bend in the pipeline. It is usually used when the pipeline is shut down or under maintenance to avoid blocking the normal operation of the pipeline.

[0056] See also Figure 2 In one embodiment, the distillation device further includes a third container, a fourth container, a second pump and a first pipeline connected therebetween. The waste water of the distillation device enters the second container from the first container via the first pump along the first pipeline for treatment, then enters the third container from the second container, and enters the fourth container from the third container via the second pump along the first pipeline for treatment; a closed discharge line is connected and arranged between the third container and the first pump outlet and the second pump outlet, and forms a third pipeline that refluxes from the first pump and the second pump to the third container.

[0057] Specifically, in the atmospheric and vacuum distillation device pipeline of another embodiment of the utility model, the discharge pipelines of the lean amine liquid pump and the rich amine liquid pump are modified. In the original pipeline, please refer to the attached Figure 2 The middle black line shows the pipeline part. The lean liquid used for desulfurization of the liquefied gas desulfurization part of the light hydrocarbon recovery system comes from the solvent regeneration part of the sulfur recovery unit, enters the lean amine liquid buffer tank V-0901 (i.e. the first container), and is pressurized by the lean amine liquid pump P-0901A / B (i.e. the first pump) and sent to the liquefied gas desulfurization tower T-0901 (i.e. the second container). The rich liquid after desulfurization flashes out the hydrocarbons carried by the rich liquid flash tank V-0902 (i.e. the third container), and is sent to the solvent regeneration part of the sulfur recovery unit (i.e. the fourth container) by the rich amine liquid pump P-0902A / B (i.e. the second pump) for regeneration and recycling.

[0058] For more details, please see the attached Figure 2The red line in the figure shows the pipeline part. By adding a closed discharge line (i.e. the third pipeline) to the rich liquid flash tank V-0902 on the pipeline from the outlet of the lean amine liquid pump and the rich amine liquid pump to the discharge port, the residual liquid in the machine pump (i.e. the first pump and the second pump) during the maintenance is discharged to the rich liquid flash tank V-0902, and then sent to the solvent regeneration unit of the sulfur recovery unit through the rich amine liquid pump P-0902A / B for regeneration and recycling. The medium before the machine pump maintenance is discharged into the rich liquid flash tank of the third container through the third pipeline instead of discharging to the floor drain, which effectively reduces the safety risk of operating personnel and avoids safety and environmental protection problems caused by pollution.

[0059] See also Figure 1 In one embodiment, the utility model further provides a flushing and replacement line of the atmospheric and vacuum distillation device, which is arranged in the above-mentioned distillation device and is connected to the first pipeline at the inlet of the first pump and the second pump, and a stop valve and a blind plate are arranged on the pipeline of the flushing and replacement line. The flushing and replacement line is provided with demineralized water.

[0060] In this way, a deionized water line is added from the inlet pipeline of the water wash pump P-0903 to the inlet of the lean amine pump and the rich amine pump, and a closed discharge line is added from the outlet of the lean amine pump and the rich amine pump to the discharge port to the rich liquid flash tank V-0902. The process treatment operation method steps for the machine pump overhaul are as follows: (where [P] before the step means that this step is an external and on-site operation step, and (P) means that this step is an internal operation, that is, it is operated through the control system)

[0061] [P]-Operators can only start working after receiving instructions and making relevant preparations and wearing labor protection;

[0062] [P] - Internal and external operation contact, press the cold centrifugal pump switching operation card to shut down the pump that needs maintenance;

[0063] [P]-Close the inlet valve and outlet valve of the pump;

[0064] (P)-Contact the internal operator to confirm that the desalted water in the boundary area is normal;

[0065] [P]-Change the closed sewage discharge process of the on-site pump;

[0066] [P]-Open the inlet desalinated water line;

[0067] [P]-Slowly open the drain valve and make sure the drain speed is not too fast;

[0068] [P]- Visual inspection shows that the medium is qualified if there is no oil stain or odor;

[0069] [P]-After the discharge is completed, if any valve is found to be loose, add a blind plate for isolation and hang a blind plate sign;

[0070] [P]-Site cleaning;

[0071] (P)-Confirm that the pump chamber pressure returns to zero;

[0072] (P)-Confirm that no medium flows out of the pump discharge port;

[0073] [P]-Contact the electrician to cut off the power supply to the pump distribution room;

[0074] [P]-Contact the equipment professionals, energy isolation is completed, and the conditions for maintenance are met;

[0075] [P]- In winter, the water in the newly equipped closed sewage pipeline must be drained;

[0076] [P]- Nitrogen replacement is performed on the newly equipped closed sewage pipeline. The oxygen content is less than 0.5% (v / v) and it is qualified; nitrogen pressure is maintained after the replacement is qualified;

[0077] [P]-Report to the internal operation department that the work has been completed and keep relevant records.

[0078] Furthermore, the first pumps arranged in groups divert the first pipeline connected to the first container to each first pump, and make the first pipeline and the second pipeline connected to each first pump merge into the second container and the third container respectively; the second pumps arranged in groups divert the first pipeline connected to the first container to each second pump, and make the first pipeline and the second pipeline connected to each second pump merge into the fourth container and the third container respectively.

[0079] Similarly, the pumps in chemical pipelines usually require redundant settings to ensure the stable operation of the pipeline system. In this way, the first pumps are arranged in groups, such as one for use and one for backup or one for use and two for backup, to prevent the normal operation of the pipeline from being affected by the failure of a single first pump or a second pump. At the same time, it is also possible to repair a single first pump or a second pump without interrupting the operation of the entire pipeline.

[0080] Furthermore, a plurality of condensate discharge ports are provided on the second pipeline, and the condensate discharge ports are respectively located on both sides of the one-way valve on the second pipeline, and blind covers are provided on the condensate discharge ports. In this way, the condensate discharge ports and blind covers are provided to discharge the medium and water that cannot be discharged at the low dead bend in the pipeline. It is usually used when the pipeline is shut down or under maintenance to avoid blocking the normal operation of the pipeline.

[0081] The utility model further provides a discharge system for a vacuum distillation device, including the above-mentioned closed discharge line and flushing replacement line. In this way, after the pipeline of the vacuum distillation device is modified, the pump to be repaired does not discharge the medium during the process, and the operation safety risk and environmental protection risk are greatly reduced.

[0082] In summary, the closed discharge line, flushing and replacement line and discharge system of the atmospheric and vacuum distillation device provided by the utility model are connected to the first container or the third container by adding a closed discharge line on the discharge pipeline of the sewage pump outlet of the first container and / or the third container of the distillation device, so that during the maintenance of the sewage pump, the residual liquid therein is discharged into the first container or the third container through the closed discharge line, instead of discharging it to the floor drain, so that the safety risks of operating personnel are effectively reduced, thereby avoiding safety and environmental problems caused by pollution.

[0083] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A closed discharge line of a atmospheric and vacuum distillation unit, characterized in that: The distillation device comprises a first container, a second container, a first pump and a first pipeline connected therebetween, and waste water from the distillation device flows from the first container through the first pump along the first pipeline into the second container for treatment; The sealed discharge line is communicated between the first container and the first pump outlet and forms a second pipeline from the first pump back to the first container.

2. The closed discharge line according to claim 1, characterized in that: The first pipeline includes a discharge pipeline connected to a discharge port, the second pipeline is connected to the discharge pipeline, and a shutoff valve is provided on the discharge pipeline between the second pipeline and the discharge port.

3. The closed discharge line according to claim 2, characterized in that: The first pumps arranged in groups make the first pipeline connected to the first container branch to each of the first pumps, and make the first pipeline and the second pipeline connected to each of the first pumps merge into the second container and the first container respectively.

4. The closed discharge line according to claim 3, characterized in that: The second pipeline is provided with a plurality of condensate discharge ports, which are respectively located on a side close to the first pipeline and a side close to the first container, and the condensate discharge ports are provided with blind covers.

5. The closed discharge line according to claim 1, characterized in that: The distillation device further comprises a third container, a fourth container, a second pump and a first pipeline connected therebetween, and waste water of the distillation device flows along the first pipeline from the first container through the first pump into the second container for treatment, then flows from the second container into the third container, and then flows along the first pipeline from the third container through the second pump into the fourth container for treatment; The sealed discharge line is arranged between the third container and the first pump outlet and the second pump outlet, and forms a third pipeline for returning from the first pump and the second pump to the third container.

6. The closed discharge line according to claim 5, characterized in that: The first pumps arranged in groups make the first pipeline connected to the first container branch to each of the first pumps, and make the first pipeline and the second pipeline connected to each of the first pumps merge into the second container and the third container respectively; The second pumps arranged in groups make the first pipeline connected to the first container branch to each of the second pumps, and make the first pipeline and the second pipeline connected to each of the second pumps merge into the fourth container and the third container respectively.

7. The closed discharge line according to claim 6, characterized in that: The second pipeline is provided with a plurality of condensate discharge ports, the condensate discharge ports are respectively located on both sides of the one-way valve on the second pipeline, and the condensate discharge ports are provided with blind covers.

8. Flushing and replacement line of atmospheric and vacuum distillation device, characterized in that: The flushing and replacement line is arranged in the distillation device as described in any one of claims 1 to 7, and is connected to the first pipeline at the inlet of the first pump and the second pump, and a stop valve and a blind plate are arranged on the pipeline of the flushing and replacement line.

9. The flushing and replacement line according to claim 8, characterized in that: The flushing line is supplied with production water and demineralized water.

10. The discharge system of the atmospheric and vacuum distillation device is characterized in that: It comprises the closed discharge line according to any one of claims 1 to 7 and the flushing replacement line according to any one of claims 8 to 9.

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