CN107940054B - Application method of antiwear multi-stage depressurization mechanism for residual oil processing - Google Patents
Application method of antiwear multi-stage depressurization mechanism for residual oil processing Download PDFInfo
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- CN107940054B CN107940054B CN201711418535.0A CN201711418535A CN107940054B CN 107940054 B CN107940054 B CN 107940054B CN 201711418535 A CN201711418535 A CN 201711418535A CN 107940054 B CN107940054 B CN 107940054B
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- pressure reducing
- inner cylinder
- reducing mechanism
- antiwear
- application method
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- 230000007246 mechanism Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012545 processing Methods 0.000 title claims description 9
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000004517 catalytic hydrocracking Methods 0.000 description 6
- 239000007795 chemical reaction product Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
Abstract
The embodiment of the invention provides an antiwear multistage depressurization mechanism, which comprises an outer cylinder and an inner cylinder which are sleeved, wherein a cavity is formed between the inner cylinder and the outer cylinder; the upper end part and the lower end part of the outer cylinder are respectively provided with a first connecting part and a second connecting part, and a positioning plate is arranged on the inner side of the lower end part of the outer cylinder; the inner cylinder is connected between the positioning plate and the first connecting part, and two ends of the cavity are respectively closed by the positioning plate and the first connecting part; the inner diameter of the inner cylinder is repeatedly changed along the axial direction. When connected in the pipeline, the fluid circulates through the inner side of the inner cylinder. The embodiment of the invention also provides an application method of the antiwear multistage pressure reducing mechanism. By installing the antiwear multi-stage pressure reducing mechanism at the downstream of the pressure reducing valve, the operation pressure difference of the pressure reducing valve can be obviously reduced, the residual pressure difference of the system is borne by the antiwear multi-stage pressure reducing mechanism, the medium flow rate at the valve core of the pressure reducing valve is obviously reduced, the abrasion of the valve core is greatly slowed down, the operation period of the high-grade special pressure reducing valve is greatly prolonged, and meanwhile, the abrasion of a pipeline behind the valve is effectively relieved.
Description
Technical Field
The invention belongs to the technical field of residual oil processing, and particularly relates to an antiwear multistage depressurization mechanism. The invention also provides an application method of the antiwear multistage pressure reducing mechanism.
Background
The slurry-bed/suspension-bed residuum hydrocracking and boiling-bed residuum hydrocracking processes are developed in recent years and are characterized by that the reaction condition is harsh (high-temp., high-pressure and hydrogen-contacting) and the reaction product contains solid catalyst particles, and the reaction product is separated from oil gas and oil residue in high-pressure separator, and the separated oil residue is reduced in pressure by means of high-grade special vacuum valve, and then fed into downstream atmospheric-vacuum oil residue separation equipment to make treatment. The high-grade special pressure reducing valve has short service life and serious abrasion of a pipeline behind the valve, the shortest service life of the valve core of the existing similar device is only a few hours, the longest operation period is only about 22 days, the pipeline behind the valve can be abraded for 1mm each day when the condition is serious, the long-period operation of the device is seriously influenced, and great potential safety hazard is brought to the operation. Because the valve core of the pressure reducing valve is special in material and structure, the maintenance cost is high, the operation cost of the device is increased by frequent replacement, the economic benefit of the device is reduced, and the slurry bed/suspended bed residual oil hydrocracking and the ebullated bed residual oil hydrocracking process are not beneficial to further popularization.
Chinese patent CN104449824a discloses a combined system for separating and depressurizing the reaction products of a hydrocracking reaction in a suspension bed. The system comprises a pressure reducing valve group for reducing pressure, wherein the pressure reducing valve group comprises at least one set of valve groups, and each set of valve groups comprises a Venturi throttling element and an angle regulating valve which are communicated with each other; the outlet of the hot high-pressure separating liquid is communicated with a Venturi throttling element of the pressure reducing valve group, and the angle type regulating valve is communicated with the hot low-pressure feeding port. Because of high solid content of oil residue and large pressure difference of pipelines, the Venturi throttling element has large abrasion and short service life, and shortens the running period of the device. Meanwhile, the angle valve has large pressure drop and difficult operation, brings potential safety hazard to production, and also improves the running cost of the device.
Disclosure of Invention
Aiming at the technical problems of easy valve abrasion, large potential safety hazard, high cost and the like of the pressure reducing valve device used in the existing residual oil processing, the embodiment of the invention provides an antiwear multistage pressure reducing mechanism and an application method thereof, which are suitable for the high-temperature and high-pressure working conditions of the residual oil processing.
In order to solve the technical problems, the invention provides an antiwear multistage depressurization mechanism, which comprises an outer cylinder and an inner cylinder which are sleeved, wherein a cavity is formed between the outer cylinder and the inner cylinder, and fluid is supplied to the inner side of the inner cylinder to circulate, wherein: the upper end part and the lower end part of the outer cylinder are respectively provided with a first connecting part and a second connecting part which are used for being in butt joint with an external pipeline, and the inner side of the lower end part of the outer cylinder is provided with a positioning plate; the upper end of the inner cylinder is connected with the first connecting part, the lower end of the inner cylinder is connected with the positioning plate, and two ends of the cavity are respectively sealed by the first connecting part and the positioning plate; the inner diameter of the inner cylinder is repeatedly changed in thickness along the axial direction.
Preferably, the longitudinal section of the inner cylinder is corrugated or saw-tooth-shaped.
Preferably, the first connecting part and the second connecting part are quick-opening detachable mechanisms or flange structures.
Preferably, the inner cylinder is detachably connected with the first connecting part and/or the positioning plate.
Preferably, the inner cylinder is integrally formed or integrally connected after being manufactured in an axial segment.
Further preferably, when the inner barrel is manufactured in axial segments, all segments are made of more than two materials.
Preferably, the whole inner cylinder is made of tungsten carbide, corundum or hard alloy; or spraying or overlaying tungsten carbide, corundum or hard alloy on the inner side of the inner cylinder.
Preferably, the exterior of the depressurization mechanism is made of hydrogen-resistant and high-temperature-resistant materials.
Preferably, the first connecting portion and the second connecting portion have different pipe diameters.
The embodiment of the invention also provides an application method of the anti-wear multi-stage pressure reducing mechanism, when the anti-wear multi-stage pressure reducing mechanism is used, a plurality of anti-wear multi-stage pressure reducing mechanisms are arranged behind the pressure reducing valve in parallel; or the pressure reducing valve and the antiwear multistage pressure reducing mechanism arranged behind the valve are used as a group, and a plurality of groups of pressure reducing mechanisms are arranged in parallel.
The technical scheme provided by the embodiment of the invention has the following advantages:
by installing the antiwear multi-stage pressure reducing mechanism provided by the invention at the downstream of the high-grade special pressure reducing valve, the operation pressure difference of the pressure reducing valve can be obviously reduced, the residual pressure difference of the system is born by the antiwear multi-stage pressure reducing mechanism, the medium flow rate at the valve core of the pressure reducing valve is obviously reduced, the abrasion of the valve core is greatly slowed down, the operation period of the high-grade special pressure reducing valve can be greatly prolonged, and meanwhile, the abrasion of a pipeline behind the valve is effectively relieved.
Drawings
Fig. 1 is a schematic structural diagram of an antiwear multi-stage pressure reducing mechanism according to an embodiment of the present invention.
[ description of the Main element symbols ]
1-an outer cylinder; 11-a first connection; 111-connecting the panel surfaces; 12-a second connection; 13-positioning plates; 2-an inner cylinder; 3-cavity; 4-an external pipe; p (P) f -a fluid channel.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides an antiwear multistage depressurization mechanism and an application method thereof, which aim at the existing problems, and the antiwear multistage depressurization mechanism is particularly suitable for being used under the working conditions of high pressure drop and high abrasion, can effectively improve the working condition of a depressurization valve, and prolongs the service life of equipment and the running period of a device.
The antiwear multi-stage pressure reducing mechanism of the embodiment is shown in figure 1 and comprises a hollow inner cylinder 2 and an outer cylinder 1 sleeved outside the inner cylinder, wherein the outer cylinder is provided with a plurality of pressure reducing groovesA cavity 3 is arranged between the cylinder 1 and the inner cylinder 2; as shown in the figure, the upper and lower ends of the outer cylinder 1 are respectively provided with a first connecting part 11 and a second connecting part 12 for butt joint with an outer pipe, in this embodiment, the outer pipe 4 at two ends of the outer cylinder 1 is respectively provided with a connecting piece matched with the first connecting part 11 and the second connecting part 12, and the outer pipe 4 and the inner cylinder 2 can be in butt joint communication to form a complete fluid channel P by connecting with the first connecting part 11 and the second connecting part 12 f The method comprises the steps of carrying out a first treatment on the surface of the As a specific embodiment, the first connection portion 11 and the second connection portion 12 may be a quick-opening detachable mechanism, or may be a flange structure, and the connection members on the external pipe 4 are correspondingly disposed. In order to adapt to complex working conditions, the first connecting part 11 and the second connecting part 12 adopt different pipe diameters, and can be conveniently in butt joint with external pipelines with different thicknesses at two ends.
A positioning plate 13 is mounted on the inner side of the lower end portion of the outer cylinder 1, i.e., the end provided with the second connecting portion 12; as shown in fig. 1, the top surface of the first connecting part 11 is a connecting plate surface 111, the upper end of the inner cylinder 2 is connected with the first connecting part 11, and the lower end is connected with the positioning plate 13; alternatively, the inner cylinder 2 is detachably connected to the connection plate 111 and/or the positioning plate 13, so that maintenance and replacement can be conveniently performed.
The two ends of the cavity 3 are respectively sealed by the first connecting part 11 and the positioning plate 13, so that fluid can be ensured to circulate from the inner side of the inner cylinder 2 after being in butt joint with the external pipeline 4, and the fluid is prevented from flowing into the cavity 3.
The inner diameter of the inner cylinder 2 is repeatedly changed along the axial direction. As a preferred embodiment, the longitudinal section of the inner cylinder 2 can be designed to be corrugated or saw-tooth, so that multistage depressurization can be effectively realized when fluid flows through the inner side of the inner cylinder 2; the inner cylinder 2 can be integrally formed and manufactured, and in order to facilitate the processing of the inner cylinder 2, the inner cylinder 2 can also be manufactured in sections along the axial direction and then assembled into a whole. For example, when the longitudinal section of the inner cylinder 2 is corrugated, the inner cylinder can be divided into multiple sections according to the circular arcs on the corrugated longitudinal section, and the sections can be respectively and independently processed and then integrally connected through mortise and tenon, and the inner cylinder is assembled and shipped from the factory in a complete set.
In order to enhance the wear resistance of the multistage depressurization mechanism, the inner cylinder 2 can be integrally made of tungsten carbide, corundum or hard alloy; tungsten carbide, corundum or cemented carbide can also be sprayed or deposited on the inner side of the inner cylinder 2.
In order to better adapt to the severe working conditions of high temperature, high pressure and hydrogen, the external material of the multistage depressurization mechanism can be selected from hydrogen-resistant and high-temperature-resistant materials.
The embodiment of the invention also provides an application method of the antiwear multistage pressure reducing mechanism. The antiwear multistage depressurization mechanism is particularly suitable for being used under the working conditions of high temperature and high pressure in residual oil processing. When the antiwear multi-stage pressure reducing mechanism is used in a residual oil pipeline, the antiwear multi-stage pressure reducing mechanism is installed and arranged behind a pressure reducing valve, namely at the downstream position of the pressure reducing valve.
In residuum hydrocracking processes, the oil residue from which the reaction product is separated in the reaction product high pressure separator is typically depressurized by means of a high-grade special pressure reducing valve. In this embodiment, the antiwear multi-stage pressure reducing mechanism is installed downstream of the high-stage pressure reducing valve, and is used to bear pipeline pressure drop.
In order to ensure long-period operation of the device, as a better implementation mode, a plurality of anti-wear multi-stage pressure reducing mechanisms can be arranged in parallel in the pressure reducing pipeline. The pressure reducing valve and the antiwear multi-stage pressure reducing mechanism behind the valve can be used as a combination, and a plurality of groups of pressure reducing pipelines are arranged in parallel.
By installing the antiwear multi-stage pressure reducing mechanism provided by the invention at the downstream of the high-grade special pressure reducing valve, the operation pressure difference of the pressure reducing valve is reduced to 2-10 MPa from 15-21 MPa, the rest 10-18 MPa pressure difference of the system is born by the antiwear multi-stage pressure reducing mechanism, the gasification rate after the valve is reduced to 0.1-0.3%, the abrasion of a valve core can be slowed down, the operation period of the high-grade special pressure reducing valve is greatly prolonged, and the service life of the high-grade special pressure reducing valve is not less than 6 months; meanwhile, the abrasion problem of the pipeline behind the valve is effectively solved.
In the description of the present invention, the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc., are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and should not be construed as limiting the present invention; unless specifically defined and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly and will be understood to those skilled in the art to be given the full breadth of the present invention; furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The foregoing is a description of a preferred embodiment of the present invention, and details of construction and features of common sense known in the art are not described in any great detail; the technical features of the embodiments may be combined with each other without causing a conflict between them. It should be noted that modifications and adaptations to the invention may be made by one of ordinary skill in the art without departing from the principles of the invention and are intended to be within the scope of the invention.
Claims (9)
1. The application method of the antiwear multi-stage depressurization mechanism for residual oil processing is characterized in that a plurality of antiwear multi-stage depressurization mechanisms are arranged behind a depressurization valve in parallel; or the pressure reducing valve and the antiwear multistage pressure reducing mechanism arranged behind the valve are used as a group, and a plurality of groups of pressure reducing mechanisms are arranged in parallel for residual oil processing;
the anti-wear multistage pressure reducing mechanism comprises an outer cylinder (1) and an inner cylinder (2) which are sleeved, a cavity (3) is formed between the outer cylinder (1) and the inner cylinder (2), and the anti-wear multistage pressure reducing mechanism comprises:
the upper end part and the lower end part of the outer cylinder (1) are respectively provided with a first connecting part (11) and a second connecting part (12) which are used for being in butt joint with an external pipeline, and the inner side of the lower end part of the outer cylinder (1) is provided with a positioning plate (13);
the upper end of the inner cylinder (2) is connected with the first connecting part (11), the lower end of the inner cylinder is connected with the positioning plate (13), and two ends of the cavity (3) are respectively sealed by the first connecting part (11) and the positioning plate (13); the inner side of the inner cylinder (2) is used for fluid circulation, and the inner diameter of the inner cylinder (2) is repeatedly changed along the axial direction.
2. The application method of the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the longitudinal section of the inner cylinder (2) is corrugated or serrated.
3. The application method of the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the first connecting portion (11) and the second connecting portion (12) are quick-opening detachable mechanisms or flange structures.
4. The application method of the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the inner cylinder (2) is detachably connected with the first connecting portion (11) and/or the positioning plate (13).
5. The application method of the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the inner cylinder (2) is integrally formed or integrally assembled after being manufactured in an axial segment.
6. The method for applying the anti-wear multi-stage pressure reducing mechanism according to claim 5, wherein when the inner cylinder (2) is manufactured in sections along the axial direction, all the sections are made of more than two materials.
7. The application method of the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the inner cylinder (2) is integrally made of tungsten carbide, corundum or cemented carbide; or spraying or overlaying tungsten carbide, corundum or hard alloy on the inner side of the inner cylinder (2).
8. The method for applying the anti-wear multi-stage pressure reducing mechanism according to claim 1, wherein the pressure reducing mechanism is made of a hydrogen-resistant and high-temperature-resistant material.
9. The application method of the antiwear multi-stage pressure reducing mechanism according to any one of claims 1 to 8, wherein the first connection portion (11) and the second connection portion (12) are different in pipe diameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400899 | 2017-12-22 | ||
| CN2017114008996 | 2017-12-22 |
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| Publication Number | Publication Date |
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| CN107940054A CN107940054A (en) | 2018-04-20 |
| CN107940054B true CN107940054B (en) | 2024-03-08 |
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| CN201711418535.0A Active CN107940054B (en) | 2017-12-22 | 2017-12-25 | Application method of antiwear multi-stage depressurization mechanism for residual oil processing |
| CN201721831724.6U Active CN207715843U (en) | 2017-12-22 | 2017-12-25 | A kind of wear-resistant multilevel decompression mechanism |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201721831724.6U Active CN207715843U (en) | 2017-12-22 | 2017-12-25 | A kind of wear-resistant multilevel decompression mechanism |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107940054B (en) * | 2017-12-22 | 2024-03-08 | 上海河图工程股份有限公司 | Application method of antiwear multi-stage depressurization mechanism for residual oil processing |
| CN111852816A (en) * | 2020-06-04 | 2020-10-30 | 聂伦喜 | Natural gas depressurization machine |
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| CN107940054A (en) | 2018-04-20 |
| CN207715843U (en) | 2018-08-10 |
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