CN103673692A - Novel raw oil top circulation oil heat exchanger - Google Patents
Novel raw oil top circulation oil heat exchanger Download PDFInfo
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- CN103673692A CN103673692A CN201310667047.9A CN201310667047A CN103673692A CN 103673692 A CN103673692 A CN 103673692A CN 201310667047 A CN201310667047 A CN 201310667047A CN 103673692 A CN103673692 A CN 103673692A
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Abstract
The invention relates to a novel raw oil top circulation oil heat exchanger. Sealing match of trapezoid grooves is adopted for a floating tube plate and a floating flange and hook-ring matched faces; baffle plates are in a D type, the radial-direction length of an incomplete part of each baffle plate is one third the inner diameter of a shell, and the distance between every two baffle plates is 0.35-0.4 time the inner diameter of the shell. Due to the trapezoid groove type sealing, it can be effectively avoided that tube pass media and shell pass media leak or seep or mix mutually to increase complexity of the corrosion environment, lead to corrosion and leakage and cause pollution to the environment; due to the arrangement of the baffle plates and the distances, flow velocity of the fluid media in a shell pass can be improved further, the turbulence degree of fluid is enhanced, and the heat exchange effect is improved; in addition, due to the arrangement of an LX-03 coating structure, the corrosion resistance and scouring resistance of a tube pass and a shell pass are improved, and economic losses caused by maintenance and replacement are reduced.
Description
Technical field
The present invention relates to oil, chemical field, is the novel material oil overhead recycle oil heat exchanger in a kind of oil plant cat-cracker specifically, belongs to cold exchange device technical field.
Background technology
Heat exchanger is the equipment of cold fluid that the part heat of hot fluid is passed to, and to realize the thermal energy transfer between different temperatures fluid, claims again heat exchanger.Heat exchanger is to realize exchange heat and the indispensable equipment of transmission in chemical process.In heat exchanger, have two kinds of fluids that temperature is different at least, a kind of fluid temperature (F.T.) is higher, emits heat; One other fluid temperature is lower, absorbs heat.In engineering practice, sometimes also can exist two or more fluids to participate in heat exchange, but its basic principle and front a kind of situation there is no difference in essence.
Modern chemical industry and petrochemical plant have maximization, and continuity is strong, and corrosivity is large, high temperature, high pressure, the feature such as inflammable and explosive.Equipment dependability, stability, security have been proposed to requirements at the higher level.Heat exchanger is the equipment of cold fluid that the part heat of hot fluid is passed to, and occupies in process of production critical role.Heat exchanger is process equipment important in petrochemical iy produced, is also important energy-saving equipment, and the running status of heat exchanger plays vital effect to the safety of whole device, product quality, energy-saving and emission-reduction.
Tubular heat exchanger is a kind of heat transmission equipment conventional in industry, and tubular heat exchanger (claiming again shell-and-tube heat exchanger) is after heat-exchanging tube bundle is connected with tube sheet, then wraps with cylindrical shell and bobbin carriage, forms two independently spaces.Passage in pipe and be called tube side with the bobbin carriage of its perforation, the passage outside pipe and be called shell side with the part of its perforation.Tubular heat exchanger because of its heat transfer area in unit volume, disposal ability and operating flexibility large, adaptable.In high temperature, high pressure and large-scale petroleum chemical plant installations, be widely used.According to thermal compensation mode difference, be mainly divided into: fixed tube sheet heat exchanger, floating head type tubular formula heat exchanger, U-shaped tubular type tubular heat exchanger.
In the cat-cracker fractionation process of oil plant, feedstock oil in heat exchanger (generally electing floating head type tubular formula heat exchanger as) and overhead (i.e. top recycle oil) heat exchange, is entered in fractionating column by further preheating.In tube side, (tower) top recycle oil temperature is 80 to 114 ℃; In shell side, feedstock oil temperature is 119 to 134 ℃.
In heat exchanger tube pass, overhead internal corrosion medium is acid water+rich gas+raw gasoline, and corrosion is mainly by H
2s-HCL-NH
3-H
2o causes.Sulfide in catalytic pyrolysis (DCC) device feedstock oil, issues solution estranged at cracking reaction temperature conditions and generates H
2s, chloride, the nitride in raw material also decomposes simultaneously.Owing to there being water to exist in system, thereby form H
2s-HCL-NH
3-H
2the corrosive environment of O type.In this environment, H
2s and the HCL formation cyclic corrosion of mutually promoting, and H
2s and NH
3existence can accelerate whole corrosion reaction process.
In feedstock oil in shell side, contain a certain amount of chlorion, chlorion, as active anion, easily, in metal surface absorption, causes skin covering of the surface to break, thereby brings out local pitting.Owing to there is oxygen in crude oil, easily there is the depolarising corrosion of oxygen, its electrochemical reaction is: anode: Fe → Fe
2++ 2e ↑; Negative electrode: O
2+ 2H
2o+4e → 4OH-.
In existing oil plant cat-cracker fractionation process, what the anticorrosion form that feedstock oil-overhead recycle oil heat exchanger adopts was leaned on is material self-preserving.The problem of its existence is, welding procedure is complicated, and comparison is difficult, and expensive, is unfavorable for promoting.Owing to there is no a kind of effective anticorrosion means; to being responsible in oil plant cat-cracker, the heat exchanger of feedstock oil and top recycle oil heat exchange is carried out to anti-corrosion protection; so there is the corrosion that fluid media (medium) heat exchanger tube side and shell side make and wash away; greatly shorten the service life of heat exchanger; increase the industrial application cost of heat exchanger; significantly improve the usage charges that cause due to reasons such as maintenance and replacings, reduce production efficiency, increase the environmental pollution causing due to heat exchanger leakage.Except etching problem, connect in addition the interior medium leakage of tube side, shell side that sealing problem causes, the environmental pollution bringing; Or the mixing of two media, the tube side causing and shell side internal corrosion environment complicated.
Summary of the invention
For the burn into of above-mentioned existence, wash away and the problem such as sealing effectiveness is not good, the object of the present invention is to provide a kind of novel material oil overhead recycle oil heat exchanger, it has not only improved the sealing property between heat exchanger tube pass and shell side, has also increased corrosion resistance and the erosive wear resistance of heat exchanger.
For achieving the above object, the technical solution used in the present invention is: novel material oil overhead recycle oil heat exchanger, comprise bobbin carriage, housing, heat-transfer pipe, deflection plate, floating tubesheet, fixed tube sheet, floating head, hook circle and pass partition, raise the nose above water to breathe to establish gasket seal between the channel flange of end and the mating surface of floating head end shell flange, Floating Head Flange is connected with hook circle by studs, and floating tubesheet contacts cooperation with Floating Head Flange and hook circle; On the end face coordinating with floating tubesheet in described Floating Head Flange, be provided with the dovetail groove of ring-type, in dovetail groove, establish sealing ring A, on the end face of corresponding floating tubesheet, establish trapezoid boss; On the outer peripheral face of floating tubesheet, establish the dovetail groove of ring-type, in dovetail groove, establish sealing ring B, on the inner peripheral surface of hook circle, establish the boss coordinating with the dovetail groove of floating tubesheet.
Further, described deflection plate is that disc-shaped structure cuts a part, and the radical length that is D font and its broken partial section is 1/3rd of housing internal diameter, and the spacing between adjacent two deflection plates is 0.35 to 0.4 times of housing internal diameter.
Further, on tube side surface and shell-side face coating LX-06 corrosion-inhibiting coating, LX-06 corrosion-inhibiting coating comprises two-layer primer coating and three aspect lacquer coats.
Further, the gross thickness of the coating of described LX-06 corrosion-inhibiting coating is less than 150 μ m.
By the mating surface at Floating Head Flange and floating tubesheet, floating tubesheet and hook circle, dovetail groove is set, and sealing ring is set in dovetail groove, increased the sealing effectiveness between floating tubesheet and Floating Head Flange, hook circle, can effectively avoid mutual seepage between tube side medium and shell side medium, mix, and then the complexity of increase corrosive environment, cause corrosion to be revealed, cause problem of environmental pollution.
To the setting of baffle arrangement and spacing, can further strengthen the flow velocity of shell side inner fluid medium, the turbulent extent of enhance fluid, improves heat transfer effect.
LX-06 coating has excellent anti-dirt and resistance to steam blowing, has good heat conductivility.Adopt this kind by the heat exchanger of the formulated one-component LX-06 coating of modified heat resistant epoxy organosilicon high molecular synthetic resin and heat resistant paint, heat filling, there is good acid and alkali resistance, oil, chemicals performance; Greatly improve corrosion-resistant, the flushing resistance of heat exchanger, effectively improve the service life of heat exchanger, reduced metal consumptive material, reduce the industrial application cost of heat exchanger, significantly reduced because the reasons such as maintenance and replacing cause economic loss, enhance productivity, and reduce the environmental pollution that causes due to heat exchanger leakage etc., there is good social benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the current fractionation tower top oil gas condensation cooler using;
Fig. 2 is the structural representation of the building block of floating head end of the present invention;
The structural representation that in Fig. 3 the present invention, floating head, floating tubesheet and hook circle coordinate;
In figure: 1 bobbin carriage, 11 channel flanges, 2 housings, 21 raise the nose above water to breathe to hold shell flange, 3 heat-transfer pipes, 4 deflection plates, 5 floating tubesheets,, 6 fixed tube sheets, 7 raise the nose above water to breathe, 71 Floating Head Flange, 8 hook circles, 9 pass partitions, 10 studs, I sealing ring A, II gasket seal, III sealing ring B.
The specific embodiment
For convenience of explanation, understand technology contents of the present invention, below in conjunction with accompanying drawing, the invention will be further described.
Be illustrated in figure 1 the feedstock oil overhead recycle oil heat exchanger (can also be expressed as feedstock oil-overhead recycle oil heat exchanger) using in existing oil plant cat-cracker fractionation process, it comprises bobbin carriage 1, housing 2, heat-transfer pipe 3, deflection plate 4, floating tubesheet 5, fixed tube sheet 6, floating head 7 and pass partition 9.Pass partition 9 is arranged in the bobbin carriage 1 of fixed tube sheet 6 one end.Raise the nose above water to breathe to establish gasket seal II between the channel flange 11 of end and the mating surface of floating head end shell flange 21, the cover plate of raising the nose above water to breathe is partly spherical, Floating Head Flange 71 is established in a border along cover plate, and Floating Head Flange 71 is connected with the hook circle 8 that is arranged on floating tubesheet 5 outer rings by studs 10.The left end side face of floating tubesheet 5 and the right-hand member side face of Floating Head Flange 71 are sealed and matched by sealing gasket, and floating tubesheet 5 is arranged in the interior ring of hook circle 8, and the inner ring surface of its outer peripheral face and hook circle 8 is sealed and matched by sealing gasket.Deflection plate 4 is distributed in housing 2, and heat-transfer pipe 3 is through deflection plate 4.The effect of deflection plate 4 is, is used for guaranteeing the flow velocity of medium in shell side, forces fluid media (medium) distance in accordance with regulations repeatedly laterally by tube bank outer surface, strengthens the turbulent extent of shell side inner fluid medium.For this heat exchanger other parts structure, and the assembled relation of each parts, because all belong to prior art, repeat no more.
Novel fractionation tower top oil gas condensation cooler as shown in Figures 2 and 3, it improves the structure of floating head part on the basis of Fig. 1.This kind of novel fractionation tower top oil gas condensation cooler improves its floating head end structure, the trapezoidal groove of ring-type is set on the right side of Floating Head Flange 71, on the left side of the floating tubesheet 5 corresponding with the right side of Floating Head Flange 71, establish the boss of ring-type, in described dovetail groove, establish sealing ring A I, the boss on the left side of floating tubesheet 5 coordinates with the trapezoidal groove on Floating Head Flange 71 right sides.Simultaneously, on the outer peripheral face of floating tubesheet 5, establish the dovetail groove of ring-type, in this dovetail groove, establish sealing ring B III, on the inner peripheral surface of hook circle 8, establish the boss coordinating with the dovetail groove of described floating tubesheet 5, the groove width of the dovetail groove on floating tubesheet 5 is more preferably greater than the width of the trapezoidal shape boss on hook circle inner peripheral surface.
In addition, to be the radical length of D font (be and cut a part of plectane) and its broken partial section be 1/3rd of housing 2 internal diameters to described deflection plate 4.And the setting that distributes alternately on the incompleteness end above-below direction of adjacent two deflection plates 4, upwards, the incompleteness end of the deflection plate 4 being adjacent is downward for the incompleteness end of a certain deflection plate 4, the like.Meanwhile, the spacing between adjacent two deflection plates 4 is 0.35 to 0.4 times of housing 2 internal diameter.To the setting of deflection plate 4 structures and spacing, can further strengthen the flow velocity of shell side inner fluid medium, the turbulent extent of enhance fluid, improves heat transfer effect.
Fluid media (medium) in the tube side of feedstock oil-overhead recycle oil heat exchanger is overhead (being called top recycle oil), and this fluid internal corrosion medium is that acid water adds rich gas+add raw gasoline, and corrosion is mainly by H
2s-HCL-NH
3-H
2o causes, in tube side, top recycle oil temperature is 80 to 114 ℃; In this environment, H
2s and the HCL formation cyclic corrosion of mutually promoting, and H
2s and NH
3existence can accelerate whole corrosion reaction process.In shell side, feedstock oil temperature is 119 to 134 ℃, contains a certain amount of chlorion in feedstock oil, and chlorion, as active anion, easily, in metal surface absorption, causes skin covering of the surface to break, thereby brings out local pitting.Owing to there is oxygen in crude oil, easily there is the depolarising corrosion of oxygen, its electrochemical reaction is: anode: Fe → Fe
2++ 2e ↑; Negative electrode: O
2+ 2H
2o+4e → 4OH-.So, the heat exchanger moving under this kind of environment, its tube side and shell side can all be subject to heavy corrosion, in order to strengthen antiseptic property, on tube side surface and the equal coating LX-06 of shell-side face corrosion-inhibiting coating, LX-06 corrosion-inhibiting coating comprises two-layer primer coating and three aspect lacquer coats.And the gross thickness of the coating of described LX-06 corrosion-inhibiting coating is less than 150 μ m.
Tube side surface comprises bobbin carriage 1 inner surface of fixed tube sheet 6 ends, and the surface of interior pass partition 9, heat-transfer pipe 3 inner surfaces, raises the nose above water to breathe the surface of 7 inner surfaces etc. and tube side medium contact.Shell-side face comprises the surface of housing 2 inner surfaces, heat-transfer pipe 3 outer surfaces, deflection plate 4 outer surfaces of heat exchanger etc. and shell side medium contact.
LX-06 coating is existing coating variety, and its main component is: epoxy resin: 5-10%; Phenolic resins: 10-30%; Organic siliconresin: 3-10%; Auxiliary agent: 1-5%; Chrome green: 20-35%; Solvent: 30-50%.(pressing mass percent)
LX-06 coating is by modified heat resistant epoxy organosilicon high molecular synthetic resin and heat resistant paint, the formulated one-component heat exchanger special coating of heat filling.Adopt the heat exchanger after LX-06 coating, there is good acid and alkali resistance, oil, chemicals performance; Greatly improve corrosion-resistant, the flushing resistance of heat exchanger, effectively improve the service life of heat exchanger, reduced metal consumptive material, reduce the industrial application cost of heat exchanger, significantly reduced because the reasons such as maintenance and replacing cause economic loss, enhance productivity, and reduce the environmental pollution that causes due to heat exchanger leakage etc., there is good social benefit.
Coating technology parameter: appearance of coat: smooth coating, even compact, smooth; Color: cobalt green look; Heat resistance: 150 ℃ to 350 ℃; Solidification temperature: 180 ℃ to 200 ℃; Flash-point: 35 ℃; Film thickness: 30 μ m * 6, gross thickness >=150 μ m.
Coating construction requirement:
1. surface is prepared and is processed: to metal surface, should adopt sandblast (ball) or the rust cleaning of other mechanical means, make surface be calx white, while adopting chemical treatment, need, through oil removing, rust cleaning, phosphatization, passivation, the step such as air-dry, must provide excellent surface;
2. total coating thickness term of reference value: >=150 μ m;
3. coating process: brushing, spraying, roller coating and filling coating method all can, heat-transfer pipe 3 is interior should adopt the painting method of filling with; Heat-transfer pipe 3 is outer should adopt showering or spraying process; Tube sheet 5(6), bobbin carriage 1, housing 2 surfaces should adopt and brush or spraying process;
Paint fluid viscosity is by spraying method design, and other construction method, as long as can be used after rule of thumb adjusting viscosity with diluent;
4. curing of coatings: solidification temperature is 180 ℃ to 200 ℃.
The serviceability table of this kind of coating is as following table.
Table one:
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (4)
1. novel material oil overhead recycle oil heat exchanger, comprise bobbin carriage, housing, heat-transfer pipe, deflection plate, floating tubesheet, fixed tube sheet, floating head, hook circle and pass partition, raise the nose above water to breathe to establish gasket seal between the channel flange of end and the mating surface of floating head end shell flange, Floating Head Flange is connected with hook circle by studs, floating tubesheet contacts cooperation with Floating Head Flange and hook circle, it is characterized in that:
On the end face coordinating with floating tubesheet in described Floating Head Flange, be provided with the dovetail groove of ring-type, in dovetail groove, establish sealing ring A, on the end face of corresponding floating tubesheet, establish trapezoid boss;
On the outer peripheral face of floating tubesheet, establish the dovetail groove of ring-type, in dovetail groove, establish sealing ring B, on the inner peripheral surface of hook circle, establish the boss coordinating with the dovetail groove of floating tubesheet.
2. novel material according to claim 1 oil overhead recycle oil heat exchanger, it is characterized in that: described deflection plate is that disc-shaped structure cuts a part, and the radical length that is D font and its broken partial section is 1/3rd of housing internal diameter, the spacing between adjacent two deflection plates is 0.35 to 0.4 times of housing internal diameter.
3. novel material according to claim 1 and 2 oil overhead recycle oil heat exchanger, is characterized in that: on tube side surface and shell-side face coating LX-06 corrosion-inhibiting coating, LX-06 corrosion-inhibiting coating comprises two-layer primer coating and three aspect lacquer coats.
4. novel material oil overhead recycle oil heat exchanger according to claim 3, is characterized in that: the gross thickness of the coating of described LX-06 corrosion-inhibiting coating is less than 150 μ m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667047.9A CN103673692A (en) | 2013-12-10 | 2013-12-10 | Novel raw oil top circulation oil heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667047.9A CN103673692A (en) | 2013-12-10 | 2013-12-10 | Novel raw oil top circulation oil heat exchanger |
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| CN103673692A true CN103673692A (en) | 2014-03-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016155582A1 (en) * | 2015-03-30 | 2016-10-06 | 茂名重力石化机械制造有限公司 | Tube heat exchanger tube-header sealing structure |
| CN107084887A (en) * | 2017-06-20 | 2017-08-22 | 沈阳汇博热能设备有限公司 | Demountable tube beam tube journey reliability pressure testing device |
| CN110186297A (en) * | 2019-07-02 | 2019-08-30 | 江苏晨力环保科技有限公司 | Acidproof heat exchanger |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2743774Y (en) * | 2004-10-01 | 2005-11-30 | 南华大学 | Detachable double tube plate shell-and-tube heat exchanger |
| CN202032923U (en) * | 2011-04-06 | 2011-11-09 | 北京化工大学 | Tube-shell type heat exchanger of large-small hole baffle plate with gap |
| CN203595432U (en) * | 2013-12-10 | 2014-05-14 | 山东蓝星清洗防腐公司 | Novel raw-oil top circulating oil heat exchanger |
-
2013
- 2013-12-10 CN CN201310667047.9A patent/CN103673692A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2743774Y (en) * | 2004-10-01 | 2005-11-30 | 南华大学 | Detachable double tube plate shell-and-tube heat exchanger |
| CN202032923U (en) * | 2011-04-06 | 2011-11-09 | 北京化工大学 | Tube-shell type heat exchanger of large-small hole baffle plate with gap |
| CN203595432U (en) * | 2013-12-10 | 2014-05-14 | 山东蓝星清洗防腐公司 | Novel raw-oil top circulating oil heat exchanger |
Non-Patent Citations (1)
| Title |
|---|
| 姬玉林: "新型防腐蚀涂料LX-06在石化企业换热器上的应用", 《材料保护》, vol. 46, no. 4, 30 April 2013 (2013-04-30), pages 60 - 61 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016155582A1 (en) * | 2015-03-30 | 2016-10-06 | 茂名重力石化机械制造有限公司 | Tube heat exchanger tube-header sealing structure |
| CN107084887A (en) * | 2017-06-20 | 2017-08-22 | 沈阳汇博热能设备有限公司 | Demountable tube beam tube journey reliability pressure testing device |
| CN107084887B (en) * | 2017-06-20 | 2023-07-28 | 沈阳汇博热能设备有限公司 | Detachable tube bundle tube side reliability pressure testing device |
| CN110186297A (en) * | 2019-07-02 | 2019-08-30 | 江苏晨力环保科技有限公司 | Acidproof heat exchanger |
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Application publication date: 20140326 |