CN217149094U - Continuous reforming system applied to secondary processing of petroleum - Google Patents
Continuous reforming system applied to secondary processing of petroleum Download PDFInfo
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- CN217149094U CN217149094U CN202123416524.3U CN202123416524U CN217149094U CN 217149094 U CN217149094 U CN 217149094U CN 202123416524 U CN202123416524 U CN 202123416524U CN 217149094 U CN217149094 U CN 217149094U
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Abstract
The utility model provides a be applied to oil secondary operation's continuous reforming system, include: a depentanizer and a circulating water washing desalter; wherein, the desalination device is washed to circulation includes: the device comprises a reflux tank, a reflux pump, a water distribution drum, a water injection pipeline, a primary heat exchanger, a secondary heat exchanger, a buffer tank, a drainage pump and a drainage pipeline. The circulating water washing desalination device is added, so that salt deposition in the tower and various problems such as pressure drop increase, corrosion of pipelines and equipment and the like caused by salt deposition can be prevented; under the condition of maintenance without stopping working, the water washing operation is carried out by utilizing the circulating water washing desalination device, so that the maintenance cost and the maintenance risk caused by salt deposition can be greatly reduced, the long-period full-load production of a continuous reforming system can be ensured, and the purposes of energy conservation and consumption reduction are achieved; the implementation of online water washing does not affect the operation of the depentanizer, does not affect the cancellation of products at the tower top and the tower bottom, and does not produce unqualified oil and dirty oil.
Description
Technical Field
The utility model belongs to the technical field of the oil processing equipment, especially, relate to a be applied to oil secondary operation's continuous reforming system.
Background
When a continuous reforming device is used for treating naphtha with high nitrogen content, the fouling phenomenon in a tower sometimes occurs, if a pre-hydrogenation device cannot effectively remove organic nitrogen, the fouling phenomenon in a depentanizer is more likely to occur, and because factors influencing the performance of the pre-hydrogenation device are many, the fouling condition almost certainly occurs in the depentanizer from the gradual deactivation of a catalyst to the condition that the reaction operation pressure does not meet the required requirement, and the like. And as long as the reforming feed contains nitrogen, the nitrogen will be released during the reforming reaction and combine with chlorine at the cooler surface to form ammonium chloride salts and precipitate. The deposition of ammonium chloride salt can cause various subsequent problems of reduced cooling effect of air cooling and water cooling, failure of tower top sealing and the like. To solve the ammonium salt deposition problem, it is generally necessary to shut down for maintenance and to check for corrosion, a common cleaning method being steam purging, but when salt blockage has affected the performance of the column, the shut down process is inconvenient and uneconomical.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a be applied to oil secondary operation's continuous reforming system. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The utility model adopts the following technical scheme:
in some alternative embodiments, there is provided a continuous reforming system for secondary processing of petroleum, comprising: a depentanizer and a circulating water washing desalter communicated with the depentanizer; the circulating water washing desalination device comprises: the system comprises a reflux tank, a reflux pump, a water distribution drum, a water injection pipeline, a primary heat exchanger, a secondary heat exchanger, a buffer tank, a drainage pump and a drainage pipeline; the water distributing drum is connected with the reflux tank, a liquid inlet of the reflux pump is connected with the reflux tank, a liquid outlet of the reflux pump is connected with the depentanizer, and a water injection end of the water injection pipeline is arranged on a pipeline connecting the water distributing drum and the depentanizer; the buffer tank with the depentanizer is connected, the income liquid mouth of drain pump with the buffer tank is connected, drainage pipe with the liquid outlet of drain pump is connected, drainage pipe comprises first calandria, second calandria and third calandria, the one-level heat exchanger sets up first calandria with second calandria hookup location department, the second grade heat exchanger sets up the second calandria with the hookup location department of third calandria.
Further, the continuous reforming system applied to secondary processing of petroleum further comprises: the device comprises a hydrogen input device, a reformed oil introduction pipeline and a hydrogenation reactor, wherein the output side of the hydrogen input device and the output port of the reformed oil introduction pipeline are connected with the input side of the hydrogenation reactor, and the output side of the hydrogenation reactor is connected with the depentanizer.
Further, the hydrogen gas input device includes: a hydrogen gas inlet pipe, a hydrogen gas filter and a hydrogen gas heater; the hydrogen filter and the hydrogen heater are disposed on the hydrogen introduction pipe.
Furthermore, one end of the first calandria is connected with a liquid outlet of the drainage pump, and the other end of the first calandria is connected with a hot coal inlet of the primary heat exchanger; and a refrigerant outlet and a refrigerant inlet of the primary heat exchanger are arranged on a pipeline connecting the hydrogenation reactor and the depentanizer.
Furthermore, one end of the second calandria is connected with the hot coal outlet of the primary heat exchanger, and the other end of the second calandria is connected with the hot coal inlet of the secondary heat exchanger; and a refrigerant outlet and a refrigerant inlet of the secondary heat exchanger are arranged on the reformed oil introducing pipeline.
Furthermore, a first flowmeter is arranged on a pipeline of the reflux tank connected with the reflux pump, and a second flowmeter is arranged on the water injection pipeline.
Furthermore, a backflow valve is arranged on a pipeline connected with the water distribution bag of the backflow tank, and a water injection valve is arranged on a water injection pipeline.
The utility model discloses the beneficial effect who brings:
1. the circulating water washing desalination device is added, so that salt deposition in the tower and various problems such as pressure drop increase, corrosion of pipelines and equipment and the like caused by salt deposition can be prevented;
2. under the condition of maintenance without stopping working, the water washing operation is carried out by utilizing the circulating water washing desalination device, so that the maintenance cost and the maintenance risk caused by salt deposition can be greatly reduced, the long-period full-load production of a continuous reforming system can be ensured, and the purposes of energy conservation and consumption reduction are achieved;
3. the implementation of online water washing does not affect the operation of the depentanizer, does not affect the cancellation of products at the tower top and the tower bottom, and does not produce unqualified oil and dirty oil.
Drawings
FIG. 1 is a schematic structural diagram of a continuous reforming system for secondary processing of petroleum according to the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
In some illustrative embodiments, as shown in fig. 1, the present invention provides a continuous reforming system for use in secondary processing of petroleum. Continuous reforming is a secondary petroleum processing technology, the processed raw materials mainly comprise low-octane-number straight-run naphtha, hydrogenated naphtha and the like, and the platinum-rhenium bimetallic catalyst is utilized to cause the molecules to be rearranged and isomerized at the high temperature of about 500 ℃, thereby increasing the yield of aromatic hydrocarbon and improving the octane number of gasoline. The continuous reforming system of the present invention comprises: a depentanizer 1 and a circulating water washing desalter, wherein the circulating water washing desalter is used for executing a desalting process and is communicated with the depentanizer. The depentanizer 1 is used for removing C5, and the C5 is used for improving the octane number of gasoline, reducing the vapor pressure of the gasoline, improving the purity of aromatic hydrocarbon and reducing the energy consumption of a device.
The invention also includes: a hydrogen input device, a reformate introduction pipeline 2 and a hydrogenation reactor 3. The hydrogenation reactor 3 is used for hydrogenating and converting heavy part of residual oil which is most difficult to be utilized in the petroleum industry into light oil so as to produce gasoline, diesel oil and the like. The output side of the hydrogen input device and the output port of the reformed oil inlet pipeline 2 are both connected with the input side of the hydrogenation reactor 3, and the output side of the hydrogenation reactor 3 is connected with the depentanizer 1. The hydrogen input device conveys hydrogen into the hydrogenation reactor 3, the reformed oil introduction pipeline 2 conveys the reformed oil into the hydrogenation reactor 3, and the reformed oil is conveyed into the depentanizer 1 after the reaction in the hydrogenation reactor 3 is finished, so as to carry out five processes of decarburization.
The hydrogen input device includes: a hydrogen gas introduction pipe 4, a hydrogen gas filter 5, and a hydrogen gas heater 6; a hydrogen filter 5 and a hydrogen heater 6 are provided on the hydrogen introduction pipe 4 for pretreating the introduced hydrogen.
The circulating water washing desalination device comprises: the system comprises a reflux tank 7, a reflux pump 8, a water separating drum 9, a water injection pipeline 10, a primary heat exchanger 11, a secondary heat exchanger 12, a buffer tank 13, a drainage pump 14 and a drainage pipeline.
The water separating drum 9 is connected with the reflux tank 7, the liquid inlet of the reflux pump 8 is connected with the reflux tank 7, the liquid outlet of the reflux pump 8 is connected with the depentanizer 1, the water injection end of the water injection pipeline 10 is arranged on the pipeline connecting the water separating drum 9 and the depentanizer 1, and the water injection pipeline 10 injects water into the depentanizer 1, so that the interior of the tower is cleaned, and ammonium chloride is removed. The buffer tank 13 is connected with the depentanizer 1, the liquid inlet of the drainage pump 14 is connected with the buffer tank 13, the drainage pipeline is connected with the liquid outlet of the drainage pump 14, and the drained water enters the buffer tank 13 and is pumped into the drainage pipeline by the drainage pump 14.
The drainage pipe is composed of a first pipe 15, a second pipe 16 and a third pipe 17.
One end of the first drain pipe 15 is connected with a liquid outlet of the drain pump 14, and the other end is connected with a hot coal inlet of the primary heat exchanger 11; the refrigerant outlet and the refrigerant inlet of the primary heat exchanger 11 are arranged on a pipeline connecting the hydrogenation reactor 3 and the depentanizer 1. The primary heat exchanger 11 thus effects heat exchange between the output product of the hydrogenation reactor and the effluent water. One end of the second calandria 16 is connected with the hot coal outlet of the primary heat exchanger 11, and the other end is connected with the hot coal inlet of the secondary heat exchanger 12; the refrigerant outlet and the refrigerant inlet of the secondary heat exchanger 12 are provided in the reformed oil inlet pipe 2. Thus, the secondary heat exchanger 12 achieves heat exchange between the reformate and the exhaust water. The structural design ensures that the desalting process is started immediately, the preparation process of the existing system is not influenced, and the quality and the preparation quantity of the product can still be ensured. And a third calandria 17 is connected with the hot coal outlet of the secondary heat exchanger 12 for draining water.
Because the water injection amount is not more than 0.5% of the reflux amount at the tower top during desalination, a first flowmeter 18 is arranged on a pipeline connecting the reflux tank 7 and the reflux pump 8, and a second flowmeter 19 is arranged on the water injection pipeline 10 to monitor the flow. A backflow valve 20 is arranged on a pipeline connecting the backflow tank 7 and the water diversion bag 9, and a water injection valve 21 is arranged on the water injection pipeline 10 so as to control the flow. Controlling the water injection time to be not more than 0.5 hour, namely controlling the water injection quantity multiplied by the water injection time to be less than the volume of the water dividing bag, and taking charge of water cutting at the water dividing bag, controlling the boundary position of the water dividing bag to be not more than 60 percent, and sampling and analyzing indexes such as PH, Cl, ammonia nitrogen and the like. And repeatedly washing for many times, judging that the salt deposition is basically washed clean when the water quality is clear and the water quality PH, Cl-, ammonia nitrogen and the like are close to the index of the desalted water, and finishing the washing.
The ammonium chloride salt is washed by water to form an acid washing solution, the corrosion degree of a pipeline can be increased in a short time, and the corrosion to stainless steel equipment and the pipeline is obvious, so that a thickness measurement record is established for the 5 air-cooled outlet pipelines before and after water washing, and the influence degree is analyzed in a contrast mode.
The pressure drop data of the tower top and the reflux tank before and after online flushing are shown in the following table, and the pressure unit is MPa:
as can be seen from the above table, after the online water flushing, the utility model discloses under the condition of depentanizer safe operation, depentanizer top pressure drop is reduced to 0.00MPa from original 0.18MPa at the biggest, the condition of the initial stage of starting up to restore to primitive basically.
The temperature data before online flushing after air cooling and water cooling are given in the following table, with the temperature units ℃:
the temperature data after on-line rinse air and water cooling are given in the following table, with temperature units ℃:
the temperature of the top of the depentanizer is reduced to be within the normal control range of 30.00 ℃ from the original maximum 42.9 ℃ after air cooling and water cooling, and the cooling effect which should be achieved by the air cooling and the water cooling is basically recovered.
The above embodiment is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above embodiment, and any other changes, modifications, replacements, combinations, simplifications, equivalent replacement modes, which are not departed from the spirit and principle of the present invention, should be included in the protection scope of the present invention.
Claims (7)
1. A continuous reforming system for secondary processing of petroleum, comprising: a depentanizer and a circulating water washing desalter communicated with the depentanizer;
the circulating water washing desalination device comprises: the system comprises a reflux tank, a reflux pump, a water distribution drum, a water injection pipeline, a primary heat exchanger, a secondary heat exchanger, a buffer tank, a drainage pump and a drainage pipeline;
the water distributing drum is connected with the reflux tank, a liquid inlet of the reflux pump is connected with the reflux tank, a liquid outlet of the reflux pump is connected with the depentanizer, and a water injection end of the water injection pipeline is arranged on a pipeline connecting the water distributing drum and the depentanizer;
the buffer tank with the depentanizer is connected, the income liquid mouth of drain pump with the buffer tank is connected, drainage pipe with the liquid outlet of drain pump is connected, drainage pipe comprises first calandria, second calandria and third calandria, the one-level heat exchanger sets up first calandria with second calandria hookup location department, the second grade heat exchanger sets up the second calandria with the hookup location department of third calandria.
2. The continuous reforming system for secondary processing of petroleum according to claim 1, further comprising: the device comprises a hydrogen input device, a reformed oil introduction pipeline and a hydrogenation reactor, wherein the output side of the hydrogen input device and the output port of the reformed oil introduction pipeline are connected with the input side of the hydrogenation reactor, and the output side of the hydrogenation reactor is connected with the depentanizer.
3. The continuous reforming system for secondary processing of petroleum according to claim 2, wherein the hydrogen gas input means comprises: a hydrogen gas introduction pipe, a hydrogen gas filter and a hydrogen gas heater; the hydrogen filter and the hydrogen heater are disposed on the hydrogen introduction pipe.
4. The continuous reforming system for secondary processing of petroleum according to claim 3, wherein one end of the first calandria is connected to the liquid outlet of the drainage pump, and the other end is connected to the hot coal inlet of the primary heat exchanger; and a refrigerant outlet and a refrigerant inlet of the primary heat exchanger are arranged on a pipeline connecting the hydrogenation reactor and the depentanizer.
5. The continuous reforming system for secondary processing of petroleum according to claim 4, wherein one end of the second row of tubes is connected to the hot coal outlet of the primary heat exchanger, and the other end is connected to the hot coal inlet of the secondary heat exchanger; and a refrigerant outlet and a refrigerant inlet of the secondary heat exchanger are arranged on the reformed oil introducing pipeline.
6. The continuous reforming system applied to secondary processing of petroleum as claimed in claim 5, wherein a first flow meter is arranged on a pipeline connecting the return tank and the return pump, and a second flow meter is arranged on a water injection pipeline.
7. The continuous reforming system applied to secondary processing of petroleum as claimed in claim 6, wherein a return valve is arranged on a pipeline connecting the return tank and the water distribution bag, and a water injection valve is arranged on a water injection pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202123416524.3U CN217149094U (en) | 2021-12-31 | 2021-12-31 | Continuous reforming system applied to secondary processing of petroleum |
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| CN202123416524.3U CN217149094U (en) | 2021-12-31 | 2021-12-31 | Continuous reforming system applied to secondary processing of petroleum |
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| CN217149094U true CN217149094U (en) | 2022-08-09 |
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| CN202123416524.3U Active CN217149094U (en) | 2021-12-31 | 2021-12-31 | Continuous reforming system applied to secondary processing of petroleum |
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