CN105465552A - Corrosion resistance structure and method for hot-cold low-temperature-separation oil junction of naphthenic-based distillate oil hydrogenation device - Google Patents
Corrosion resistance structure and method for hot-cold low-temperature-separation oil junction of naphthenic-based distillate oil hydrogenation device Download PDFInfo
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- CN105465552A CN105465552A CN201510953233.8A CN201510953233A CN105465552A CN 105465552 A CN105465552 A CN 105465552A CN 201510953233 A CN201510953233 A CN 201510953233A CN 105465552 A CN105465552 A CN 105465552A
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- cold
- distributing pipe
- oil distributing
- point
- low oil
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Classifications
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The invention relates to a corrosion resistance structure and method for a hot-cold low-temperature-separation oil junction of a naphthenic-based distillate oil hydrogenation device. According to the corrosion resistance structure, a cold low-temperature-separation oil pipe is connected with a hot low-temperature-separation oil pipe through a tee joint; the cold low-temperature-separation oil pipe is formed by welding a plurality of layers of expanded pipes in a stacked mode; the included angle a of the junction between the cold low-temperature-separation oil pipe and the tee joint is equal to or larger than 75 degrees. The corrosion resistance method comprises the steps that the diameter of the cold low-temperature-separation oil pipe is gradually expanded to be equal to the diameter of a hot medium pipeline in front of an injection point of the cold low-temperature-separation oil pipe, and the height of the multiple expanded pipes is adjusted till the included angle a of the junction between the cold low-temperature-separation oil pipe and the tee joint is equal to or larger than 75 degrees; and the hot low-temperature-separation oil pipe is communicated with the expanded cold low-temperature-separation oil pipe through the tee joint in the position of the junction. The corrosion resistance structure is small in size and low in investment. Special requirements for materials are avoided, the material of the corrosion resistance structure needs to be consistent with that of the pipes, and the problem of foreign material welding is not involved.
Description
Technical field
The invention belongs to petrochemical equipment technical field, particularly relate to the cold and hot low point of oily point anticorrosion structure of a kind of cycloalkyl distillate hydrogenation device and method.
Background technique
Current conventional cycloalkyl distillate hydrogenation is produced in the flow process of lube base oil, hydrogenation reaction product carries out vapor-liquid separation under 220-250 DEG C of condition, liquid phase sends into fractionating system, gas phase carries out secondary separation after being cooled to 40-60 DEG C, secondary separation condensed fluid injects first separation fluid pipeline, jointly sends into fractionating system.Owing to containing water and low-boiling point liquid in cold medium, cause decanting point place corrosive pipeline.
Prior art is as follows:
1st kind: directly inject, make regular check on.Device can be caused to stop in emergency.
2nd kind: do corrosion resistant lining at point inner-walls of duct, due to lining material and pipe material inconsistent, cause welding dissimilar materials, complex process, and lining material is not easily bought.
First separation lime set (thermal medium) flow is comparatively large, and temperature is usually within the scope of 220 ~ 250 DEG C, and secondary separation lime set (cold medium) flow is less, and temperature is usually within the scope of 40 ~ 60 DEG C, and moisture higher.Because the cold medium instant vaporization of concourse causes pipe flushing seriously corroded, device is only 6 months the shortest service time, and due to corrosion herein, material from leakage once caused device to stop in emergency twice, and device often stops, the economic loss of driving about 3,000,000 yuan.
Therefore the present invention needs research to obtain one for point cold and hot low point of oily point anticorrosion structure of oily hydrogenation plant and a method.
Summary of the invention
In petrochemical plant, cold medium and thermal medium point place, because cold media fraction is vaporized, cause wall erosion, affect device long-period stable operation.The invention provides the cold and hot low point of oily point anticorrosion structure of a kind of alkyl distillate hydrogenation device and method, from reducing concourse velocity of medium, reducing the temperature in cold and hot medium contact face, solve medium instant vaporization and wash away the corrosive pipeline problem caused.
For achieving the above object, the invention provides the cold and hot low point of oily point anticorrosion structure of a kind of cycloalkyl distillate hydrogenation device; The cold and hot low point of oily point anticorrosion structure of described cycloalkyl distillate hydrogenation device comprises:
Cold low oil distributing pipe road is connected by the low oil distributing pipe of threeway and heat, and wherein, cold low oil distributing pipe road is the pipeline that multilayer expansion tube superposition welding is formed; Described cold low oil distributing pipe road and angle a >=75 °, threeway joint.
Further, described threeway is equal tee.
Preferably, described equal tee is of a size of DN150 × 150 × 150mm.
Further, described equal tee is arranged on the position of hot low oil distributing pipe road point, realizes the UNICOM of cold low oil distributing pipe and the low oil distributing pipe of heat.
Further, the cold low oil distributing pipe road that formed of described multilayer expansion tube superposition welding finally expanding after pipe diameter equal hot low oil distributing pipe road caliber.
Further, the superposition of the multilayer reducing in cold low oil distributing pipe road that formed of described multilayer expansion tube superposition welding and selection rule are: the velocity ratio of flow velocity u2: u1/u2 >=9:1 after making cold medium normal flow u1 and slowing down; The ratio of the former caliber D1 of cold low oil distributing pipe and reducing height H 1: D1/H1 < 1:3.5.
Present invention also offers the cold and hot low point of oily point preserving method of a kind of cycloalkyl distillate hydrogenation device, comprise: cold low oil distributing pipe road is progressively expanding to hot medium pipeline caliber by cold low oil distributing pipe road before decanting point, the height of adjustment multilayer expansion tube, to cold low oil distributing pipe road and angle a >=75 °, threeway joint; Heat low oil distributing pipe road point position by equal tee and expanding after cold low oil distributing pipe road UNICOM.
Further, the superposition of the multilayer reducing in cold low oil distributing pipe road that formed of described multilayer expansion tube superposition welding and selection rule are: the velocity ratio of flow velocity u2: u1/u2 >=9:1 after making cold medium normal flow u1 and slowing down; The ratio of the former caliber D1 of cold low oil distributing pipe and reducing height H 1: D1/H1 < 1:3.5.
Beneficial effect of the present invention is:
Under the condition of cold rate-of flow lower than thermal medium flow, cold low oil distributing pipe is progressively expanding, converges with the low oil distributing pipe of heat.Point place thermal medium wants suitable reduction of speed, mixes, to reduce cold and hot medium contact surface temperature and flow velocity, reduce cold and hot medium unit area vaporization rate with cold media fraction.The present invention is progressively expanding to hot medium pipeline caliber by cold medium pipeline before decanting point by cold medium pipeline, and the height of the height of adjustment multilayer expansion tube, to cold low oil distributing pipe road and angle a >=75 °, threeway joint, therefore reduces cold velocity of medium.Expand the piping volume of cold and hot medium intersection simultaneously, increase cold and hot medium contact area, reduce the temperature in cold and hot medium contact face, reach and reduce cold medium gasification degree in surface of contact unit area, simultaneously by reducing vaporization gas to the direct erosion corrosion of tube wall.Present device volume is little, invests low.To material without particular/special requirement, consistent with pipeline body material, do not relate to heterogeneous material Welding Problems.
Accompanying drawing explanation
Fig. 1 is the cold and hot low point of oily point anticorrosion structure schematic diagram of cycloalkyl distillate hydrogenation device of the present invention;
Fig. 2 is the liquid flow direction schematic diagram of one embodiment of the present of invention;
Fig. 3 is the structural representation of the present embodiment;
1. cold low oil distributing pipe road, 2. threeway, 3. hot low oil distributing pipe road, 4. expansion tube, 4-1. first expansion tube, 4-2. second expansion tube.
Embodiment
Following content will elaborate to specific embodiments of the invention in conjunction with Figure of description:
As shown in Figure 1, the cold and hot low point of oily point anticorrosion structure of a kind of cycloalkyl distillate hydrogenation device; The cold and hot low point of oily point anticorrosion structure of described cycloalkyl distillate hydrogenation device comprises:
Cold low oil distributing pipe road 1 is connected by the low oil distributing pipe 2 of threeway 3 and heat, and wherein, cold low oil distributing pipe road 1 is the pipeline that multilayer expansion tube 4 superposes welding formation; Described cold low oil distributing pipe road 1 and three leads to 3 and connects and locate angle a >=75 °.Described threeway 3 is equal tee; Equal tee is arranged on the position of hot low oil distributing pipe road 2 point, realizes the UNICOM of cold low oil distributing pipe 1 and the low oil distributing pipe 2 of heat.Pipe diameter after the cold low oil distributing pipe road 1 that described multilayer expansion tube superposition welding is formed is finally expanding equals hot low oil distributing pipe road 2 caliber.
Wherein, multilayer expansion tube 4 superposes the superposition of multilayer reducing in the cold low oil distributing pipe road 1 that welding is formed and selection rule is: the velocity ratio of flow velocity u2: u1/u2 >=9:1 after making cold medium normal flow u1 and slowing down; The ratio of the former caliber D1 of cold low oil distributing pipe and reducing height H 1: D1/H1 < 1:3.5.
Above-mentioned anticorrosion structure is utilized to realize the cold and hot low point of oily point preserving method of cycloalkyl distillate hydrogenation device, comprise: cold low oil distributing pipe road is progressively expanding to hot medium pipeline caliber by cold low oil distributing pipe road before decanting point, the height of adjustment multilayer expansion tube, to cold low oil distributing pipe road and angle a >=75 °, threeway joint; Heat low oil distributing pipe road point position by equal tee and expanding after cold low oil distributing pipe road UNICOM.
Please refer to Fig. 2 and Fig. 3 understanding and the invention provides a specific embodiment.As Fig. 2, shown in Fig. 3: in hydrogenation plant, because cold and hot low point of oily point corrosion leakage causes device to stop in emergency, the present situation of this device is that cold low point of oil injects hot low oil distributing pipe road, the caliber DN150 in the low oil distributing pipe road 3 of heat, temperature is usually within the scope of 210 ~ 250 DEG C, the caliber DN50 in cold low oil distributing pipe road 1, temperature is usually within the scope of 40 ~ 60 DEG C, for shortening device downtime, the present embodiment chooses two-stage reducing: the first expansion tube 4-1 (DN150 × 50) and the second expansion tube 4-2 (DN150 × 80) welds together, by cold low oil distributing pipe road by original DN50 straight tube, expanding to DN150, to simultaneously, the low oil distributing pipe road of heat increases equal tee 3 and is of a size of DN150 × 150 × 150 in point position, now (H1+H2) is 295mm, a >=75 ° (see Fig. 3).Former cold and hot medium contact area is 0.0079m
2, amass after transformation as 0.071m
2, the rate of gasification in cold velocity of medium and unit area all reduces nearly 90%, greatly reduces tube wall erosion corrosion.
Its concrete computational process is as follows:
One, volume flowrate q is calculated
v:
q
v＝q
m/r
Wherein:
Fluid density r, kg/m
3
Volume flowrate q
v, m
3/ h
Mass flow rate q
m, kg/h
Two, Fluid Computation flow velocity u
b:
u
b＝q
v/A＝4q
v/(πD
2)
Wherein:
Flow velocity u
b, m/s
Volume flowrate q
v, m
3/ h
Pipeline section amasss A, m
2
Pipe diameter D, m
Three, volume flowrate, the flow velocity of fluid is gone out according to above formulae discovery:
Known: r=850kg/m
3q
mthe expanding front caliber D of the cold medium of=868kg/h
1=50mm
The expanding rear caliber D of cold medium
2=150mm
q
v＝q
m/r＝868/850＝1.0212m
3/h
(1), cold medium normal flow u
1:
u
1＝q
v1/A
1＝4q
v1/(πD
1 2)＝4×1.0212/(3600×π×0.05
2)＝0.15m/s
(2), flow velocity u after cold media deceleration
2:
u
2＝q
v2/A
2＝4q
v2/(πD
2 2)＝4×1.0212/(3600×π×0.15
2)＝0.017m/s
When caliber changes, each position data see the following form-1
Table 1
In addition also by changing the parameter of expanding front caliber D1 and expanding rear caliber D2, be more embodiment, the concrete data of the parameter adopted are as table 2.
Table 2
Above-described embodiment also can adopt the variable-diameter structure of different size to combine, as long as meet required velocity ratio u1/u2 >=9:1, D1/H1 < 1:3.5.
In method of the present invention, under the condition of cold rate-of flow lower than thermal medium flow, cold low oil distributing pipe is progressively expanding, converges with the low oil distributing pipe of heat.Point place thermal medium wants suitable reduction of speed, mixes, to reduce cold and hot medium contact surface temperature and flow velocity, reduce cold and hot medium unit area vaporization rate with cold media fraction.The present invention is progressively expanding to hot medium pipeline caliber by cold medium pipeline before decanting point by cold medium pipeline, and as shown in Figure 2, the height of adjustment H1, ensures cold low oil distributing pipe road and angle a >=75 °, threeway joint, therefore reduce cold velocity of medium.Expand the piping volume of cold and hot medium intersection simultaneously, increase cold and hot medium contact area, reduce the temperature of cold and hot Jie's surface of contact, reach and reduce cold medium gasification degree in surface of contact unit area, simultaneously by reducing vaporization gas to the direct erosion corrosion of tube wall.Present device volume is little, invests low.To material without particular/special requirement, consistent with pipeline body material, do not relate to heterogeneous material Welding Problems.
The above, be only preferred embodiment of the present invention, and all equalizations done according to shape of the present invention, structure, feature and spirit change and modify, and all should be included within protection scope of the present invention.
Claims (7)
1. the cold and hot low point of oily point anticorrosion structure of cycloalkyl distillate hydrogenation device, it is characterized in that: the cold and hot low point of oily point anticorrosion structure of described cycloalkyl distillate hydrogenation device comprises: cold low oil distributing pipe road is connected by the low oil distributing pipe of threeway and heat, wherein, cold low oil distributing pipe road is the pipeline that multilayer expansion tube superposition welding is formed; Described cold low oil distributing pipe road and angle a >=75 °, threeway joint.
2. the cold and hot low point of oily point anticorrosion structure of cycloalkyl distillate hydrogenation device according to claim 1, is characterized in that: described threeway is equal tee.
3. the cold and hot low point of oily point anticorrosion structure of cycloalkyl distillate hydrogenation device according to claim 1 and 2, is characterized in that: described threeway is arranged on the position of hot low oil distributing pipe road point, realizes the UNICOM of cold low oil distributing pipe and the low oil distributing pipe of heat.
4. the cold and hot low point of oily point anticorrosion structure of cycloalkyl distillate hydrogenation device according to claim 1, is characterized in that: the pipe diameter after the cold low oil distributing pipe road that described multilayer expansion tube superposition welding is formed is finally expanding equals hot low oil distributing pipe road caliber.
5. the cold and hot low point of oily point anticorrosion structure of the cycloalkyl distillate hydrogenation device according to claim 1 or 4, is characterized in that: superposition and the selection rule of the multilayer reducing in the cold low oil distributing pipe road that described multilayer expansion tube superposition welding is formed are: the velocity ratio of flow velocity u2: u1/u2 >=9:1 after making cold medium normal flow u1 and slowing down; The ratio of the former caliber D1 of cold low oil distributing pipe and reducing height H 1: D1/H1 < 1:3.5.
6. the cold and hot low point of oily point preserving method of cycloalkyl distillate hydrogenation device, it is characterized in that: described method comprises: cold low oil distributing pipe road is progressively expanding to hot medium pipeline caliber by cold low oil distributing pipe road before decanting point, the height of adjustment multilayer expansion tube, to cold low oil distributing pipe road and angle a >=75 °, threeway joint; Heat low oil distributing pipe road point position by equal tee and expanding after cold low oil distributing pipe road UNICOM.
7. the cold and hot low point of oily point preserving method of cycloalkyl distillate hydrogenation device according to claim 6, is characterized in that: superposition and the selection rule of the multilayer reducing in the cold low oil distributing pipe road that described multilayer expansion tube superposition welding is formed are: the velocity ratio of flow velocity u2: u1/u2 >=9:1 after making cold medium normal flow u1 and slowing down; The ratio of the former caliber D1 of cold low oil distributing pipe and reducing height H 1: D1/H1 < 1:3.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510953233.8A CN105465552A (en) | 2015-12-17 | 2015-12-17 | Corrosion resistance structure and method for hot-cold low-temperature-separation oil junction of naphthenic-based distillate oil hydrogenation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510953233.8A CN105465552A (en) | 2015-12-17 | 2015-12-17 | Corrosion resistance structure and method for hot-cold low-temperature-separation oil junction of naphthenic-based distillate oil hydrogenation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105465552A true CN105465552A (en) | 2016-04-06 |
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ID=55603563
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|---|---|---|---|
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5277997A (en) * | 1975-12-25 | 1977-06-30 | Ishikawajima Harima Heavy Ind Co Ltd | Crossed type joint |
| JPH05263979A (en) * | 1992-03-16 | 1993-10-12 | Kobe Steel Ltd | Branch joint for powder and granular material pneumatic conveyance |
| CN200961767Y (en) * | 2006-06-05 | 2007-10-17 | 罗志军 | Three-way for heat mixing |
| CN101598258A (en) * | 2009-04-27 | 2009-12-09 | 清华大学 | Reduce the apparatus and method of thermal fatigue in the T type pipeline cold fluid and hot fluid mixed process |
| CN201462272U (en) * | 2009-06-09 | 2010-05-12 | 中国寰球工程公司 | Reinforced type reducing branching pipe joint structure and reducing branching pipe joint thereof |
| CN102052536A (en) * | 2009-07-22 | 2011-05-11 | 刘友宏 | Thermal stress tee joint |
| CN202302506U (en) * | 2011-11-07 | 2012-07-04 | 中国石油化工股份有限公司 | Tee for mixing cold and hot fluids |
-
2015
- 2015-12-17 CN CN201510953233.8A patent/CN105465552A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5277997A (en) * | 1975-12-25 | 1977-06-30 | Ishikawajima Harima Heavy Ind Co Ltd | Crossed type joint |
| JPH05263979A (en) * | 1992-03-16 | 1993-10-12 | Kobe Steel Ltd | Branch joint for powder and granular material pneumatic conveyance |
| CN200961767Y (en) * | 2006-06-05 | 2007-10-17 | 罗志军 | Three-way for heat mixing |
| CN101598258A (en) * | 2009-04-27 | 2009-12-09 | 清华大学 | Reduce the apparatus and method of thermal fatigue in the T type pipeline cold fluid and hot fluid mixed process |
| CN201462272U (en) * | 2009-06-09 | 2010-05-12 | 中国寰球工程公司 | Reinforced type reducing branching pipe joint structure and reducing branching pipe joint thereof |
| CN102052536A (en) * | 2009-07-22 | 2011-05-11 | 刘友宏 | Thermal stress tee joint |
| CN202302506U (en) * | 2011-11-07 | 2012-07-04 | 中国石油化工股份有限公司 | Tee for mixing cold and hot fluids |
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Application publication date: 20160406 |
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