Online washing system for heat exchanger of heavy oil processing device
By designing an online flushing system for heat exchanger of heavy oil processing device and using diesel to flush and replace heavy oil system, the problems of long purge time, large steam usage and safety hazards after the heavy oil processing device is shut down, and the device is closed purge, Green and environmentally friendly shutdown.
Patent Information
- Application Number
- CN202421197390.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-29
AI Technical Summary
After the heat exchanger of the heavy oil processing device is shut down, due to the long heat exchange network, heavy oil properties, large purge area, etc., the amount of steam purge is large, the purge time is long, and the steam balance is difficult, which affects the subsequent device shutdown and purge. and maintenance time and progress, as well as safety hazards and environmental pollution.
A heavy oil processing device heat exchanger online flushing system is designed. The diesel oil is introduced into the device through diesel tanks and diesel outlet devices to flush and replace the heavy oil system. The hot oil is used to fully flush the heavy oil system to achieve all-round oil reduction and reduce the steam consumption. and purge time.
It effectively shortens the device's purge time, reduces steam consumption, realizes closed purge of the device, reduces on-site odor, avoids environmental pollution, and improves the safety and environmental protection of the shutdown process.
Smart Images
Figure CN222505146U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heavy oil processing in petrochemical industry, in particular to an online flushing system for a heat exchanger of a heavy oil processing device. Background Art
[0002] Since the 21st century, with the steady growth of global oil demand and the depletion of conventional oil reserves, a transition has been made from traditional oil to unconventional oil. The rational use of heavy oil can not only alleviate the increasingly tense energy situation, but also meet the increasingly stringent environmental protection requirements.
[0003] After the traditional heavy oil processing unit's heat exchanger device is shut down, the heavy oil unit is affected by the long heat exchange network, heavy oil properties, and large purge area, resulting in a large amount of purge steam and a long purge time. During the comprehensive shutdown and maintenance of the unit, steam balance is extremely difficult, affecting the subsequent shutdown and purge and maintenance schedule of other units. At the same time, in order to achieve thorough purge of blind ends, during the on-site purge inspection, the purge medium evaporates into the atmosphere with the steam, posing a great safety hazard, causing odor and environmental pollution on site, and seriously affecting the occupational health of employees. Utility Model Content
[0004] In view of the above problems existing in the heat exchanger of the existing heavy oil processing device, the present utility model is proposed.
[0005] Therefore, the purpose of the utility model is to provide an online flushing system for a heat exchanger of a heavy oil processing device, which solves the problem in the prior art that after the heat exchanger of the heavy oil processing device is shut down, the heavy oil device is affected by the long heat exchange network, the heavy nature of the oil, the large purge area, etc., resulting in a large amount of purge steam for the device and a long purge time. During the comprehensive shutdown and maintenance of the device, steam balance is extremely difficult, affecting the subsequent shutdown and purge and maintenance schedule of other devices. At the same time, in order to achieve thorough purge of blind ends and dead corners, during the on-site purge inspection, the purge medium evaporates into the atmosphere with the steam, posing a great safety hazard, causing on-site odor and environmental pollution, and seriously affecting the occupational health of employees.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A heavy oil processing device heat exchanger online flushing system comprises a diesel tank and a diesel outlet device, the diesel outlet device is arranged on one side of the diesel tank, a first connecting pipe is arranged between the diesel outlet device and the diesel pipe, a second connecting pipe is arranged on one side of the first connecting pipe, both ends of the second connecting pipe are respectively connected with a device start-up circulation line and a crude oil pump, the liquid outlet of the crude oil pump is connected with a crude oil inlet device through a third connecting pipe, a fourth connecting pipe is connected between the first connecting pipe and the second connecting pipe, a first valve body and a second valve body are respectively arranged at both ends of the fourth connecting pipe, and an anti-backflow device is connected between the first valve body and the second valve body.
[0008] Preferably, the backflow prevention device includes a partition and a fixed shell, the partition is fixedly arranged in the middle of the fixed shell, through holes are opened on both sides of the fixed shell, a through slot is opened in the middle of the partition, rotating rods are rotatably arranged on both sides inside the through slot, a rotating plate is fixedly sleeved on the rod wall of the rotating rod, the two sides of the rotating plates facing away from each other are in conflict with the inner wall of the through slot, and the two sides of the rotating plates close to each other are in conflict, fixed plates are fixedly arranged at both ends of the side of the partition close to the first valve body, and one side of the rotating plate is in conflict with the fixed plate.
[0009] Preferably, a torsion spring is provided on the movable sleeve of the rod wall of the rotating rod, and two ends of the torsion spring are respectively fixedly connected to the corresponding rotating rod and the inner wall of the through slot.
[0010] Preferably, outer walls of the two rotating plates are provided with rubber pads.
[0011] Preferably, both ends of the two rotating plates are rounded.
[0012] Preferably, an avoidance groove is provided on the inner wall of the through groove at a position corresponding to the torsion spring.
[0013] In the above technical solution, the technical effects and advantages provided by the utility model are:
[0014] 1. The utility model uses lighter diesel to flush and replace the heavy oil in the heavy oil device system, which is convenient for device purging, further shortens the device purging time, and reduces steam consumption. It effectively solves the odor problem on the device site and realizes closed purging of the device and green and environmentally friendly shutdown.
[0015] 2. The utility model adds a connecting line between the Changchai production line and the start-up circulation line of the device through technical transformation. After the device is shut down, the diesel stored in the early stage is introduced into the device through the crude oil pump to flush and replace the heavy oil system, and the density of the flushing oil at the crude oil and residual oil sampling ports is replaced until the density of the crude oil is consistent. After the system is changed to a closed-loop circulation, the heating furnace is lit to maintain the furnace outlet temperature at around 120°C, and the hot oil flushing and replacement system is fully utilized to completely realize the all-round oil withdrawal of the heavy oil system, creating favorable conditions for the later purging of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0017] Figure 1 This is a structural schematic diagram of an online flushing system for a heat exchanger of a heavy oil processing device proposed by the utility model;
[0018] Figure 2 for Figure 1 Schematic diagram of the internal structure of the backflow prevention device.
[0019] Description of reference numerals:
[0020] 1. Diesel tank; 2. Diesel outlet device; 3. First connecting pipe; 4. Device start-up circulation line; 5. Crude oil inlet device; 6. Second connecting pipe; 7. Crude oil pump; 8. Third connecting pipe; 9. Fourth connecting pipe; 10. First valve body; 11. Second valve body; 12. Backflow prevention device; 13. Partition; 14. Rotating rod; 15. Rotating plate; 16. Torsion spring; 17. Fixed plate; 18. Fixed shell. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0022] The utility model embodiment discloses an online flushing system for a heat exchanger of a heavy oil processing device.
[0023] Reference Figure 1-2 A heavy oil processing device heat exchanger online flushing system comprises a diesel tank 1 and a diesel outlet device 2, the diesel outlet device 2 is arranged on one side of the diesel tank 1, a first connecting pipe 3 is arranged between the diesel outlet device 2 and the diesel pipe, a second connecting pipe 6 is arranged on one side of the first connecting pipe 3, both ends of the second connecting pipe 6 are respectively connected with a device start-up circulation line 4 and a crude oil pump 7, the liquid outlet of the crude oil pump 7 is connected with a crude oil inlet device 5 through a third connecting pipe 8, a fourth connecting pipe 9 is connected between the first connecting pipe 3 and the second connecting pipe 6, and both ends of the fourth connecting pipe 9 are respectively provided with a first valve body 10 and a second valve body 11.
[0024] Reference Figure 1-2A backflow prevention device 12 is connected between the first valve body 10 and the second valve body 11. The backflow prevention device 12 includes a partition 13 and a fixed shell 18. The partition 13 is fixedly arranged in the middle of the fixed shell 18. Through holes are provided on both sides of the fixed shell 18. A through groove is provided in the middle of the partition 13. Rotating rods 14 are rotatably arranged on both sides of the inner part of the through groove. A rotating plate 15 is fixedly sleeved on the rod wall of the rotating rod 14. The opposite sides of the two rotating plates 15 are in conflict with the inner wall of the through groove, and the close sides of the two rotating plates 15 are in conflict with each other. Rubber pads are provided on the outer walls of the two rotating plates 15 to improve the sealing between the two rotating plates 15. Both ends of the two rotating plates 15 are rounded to prevent the two rotating plates 15 from interfering with each other during rotation. Fixed plates 17 are fixedly arranged on both ends of the side of the partition 13 close to the first valve body 10, and one side of the rotating plate 15 is in conflict with the fixed plate 17.
[0025] Reference Figure 1-2 A torsion spring 16 is movably sleeved on the rod wall of the rotating rod 14, and the two ends of the torsion spring 16 are fixedly connected to the corresponding rotating rod 14 and the inner wall of the through groove respectively. In a natural state, the elastic force of the torsion spring 16 will cause the rotating rod 14 to rotate and drive the rotating plate 15 to rotate to a horizontal state. An avoidance groove is provided on the inner wall of the through groove and at a position corresponding to the torsion spring 16, so that the side wall of the rotating plate 15 can better fit the inner wall of the through groove.
[0026] In the utility model, when in use, a new diesel outlet device 2 is added to connect 4 communication lines (fourth connecting pipe 9) with the start-up circulation line, and a first valve body 10 and a second valve body 11 are added in the middle of the communication line (fourth connecting pipe 9). Before the device is started, a blind plate is added between the double valves to prevent the medium from being mixed. The diesel is introduced to the inlet of the crude oil pump 7 through the device start-up circulation line 4, and the crude oil pump 7 is started to introduce the diesel into the system through the crude oil line (second connecting pipe 6) for flushing and replacement. The dirty oil after flushing is withdrawn to the crude oil tank area through the heavy dirty oil line of the device, so as to realize thorough flushing and replacement of the heavy oil system, that is, the purge time and steam consumption of the device can be effectively reduced, and the closed purge and green environmental protection shutdown of the device can be realized, which can effectively reduce the odor on site and avoid polluting the environment.
[0027] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. An online flushing system for a heat exchanger of a heavy oil processing device, comprising a diesel tank (1) and a diesel outlet device (2), characterized in that: The diesel outlet device (2) is arranged at one side of the diesel tank (1); a first connecting pipe (3) is arranged between the diesel outlet device (2) and the diesel pipe; a second connecting pipe (6) is arranged at one side of the first connecting pipe (3); two ends of the second connecting pipe (6) are respectively connected with a device start-up circulation line (4) and a crude oil pump (7); a liquid outlet of the crude oil pump (7) is connected with a crude oil inlet device (5) via a third connecting pipe (8); a fourth connecting pipe (9) is connected between the first connecting pipe (3) and the second connecting pipe (6); a first valve body (10) and a second valve body (11) are respectively arranged at two ends of the fourth connecting pipe (9); and a backflow prevention device (12) is connected between the first valve body (10) and the second valve body (11).
2. The online flushing system for the heat exchanger of the heavy oil processing device according to claim 1 is characterized in that: The backflow prevention device (12) comprises a partition (13) and a fixed shell (18), wherein the partition (13) is fixedly arranged in the middle of the fixed shell (18), through holes are provided on both sides of the fixed shell (18), a through slot is provided in the middle of the partition (13), rotating rods (14) are rotatably arranged on both sides of the interior of the through slot, a rotating plate (15) is fixedly sleeved on the rod wall of the rotating rod (14), the two sides of the rotating plates (15) facing away from each other are in contact with the inner wall of the through slot, and the two sides of the rotating plates (15) facing each other are in contact with each other, and the two ends of the side of the partition (13) close to the first valve body (10) are fixedly arranged with fixed plates (17), and one side of the rotating plate (15) is in contact with the fixed plate (17).
3. The online flushing system for the heat exchanger of the heavy oil processing device according to claim 2 is characterized in that: A torsion spring (16) is provided on the movable sleeve of the rod wall of the rotating rod (14), and two ends of the torsion spring (16) are respectively fixedly connected to the corresponding rotating rod (14) and the inner wall of the through groove.
4. The on-line flushing system for a heat exchanger of a heavy oil processing device according to claim 2, characterized in that: The outer walls of the two rotating plates (15) are both provided with rubber pads.
5. The on-line flushing system for a heat exchanger of a heavy oil processing device according to claim 2, characterized in that: Both ends of the two rotating plates (15) are rounded.
6. The on-line flushing system for a heat exchanger of a heavy oil processing device according to claim 3 is characterized in that: An escape groove is provided on the inner wall of the through groove at a position corresponding to the torsion spring (16).