CN204730719U - The spiral generating tube of liquified natural gas vaporizer - Google Patents
The spiral generating tube of liquified natural gas vaporizer Download PDFInfo
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- CN204730719U CN204730719U CN201520289290.6U CN201520289290U CN204730719U CN 204730719 U CN204730719 U CN 204730719U CN 201520289290 U CN201520289290 U CN 201520289290U CN 204730719 U CN204730719 U CN 204730719U
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Abstract
The utility model discloses the spiral generating tube of liquified natural gas vaporizer.Spiral generating tube is integrally connected to form by vaporization section and bringing-up section, and the inner sleeve established in outer tube and its one end combines and forms vaporization section, does not establish the outer tube of inner sleeve to form bringing-up section; Vaporization segment length 2 3 meters; The inwall of outer tube is inner thread; Inner thread is spiral lamination, the height of spiral lamination be 5 7mm, the large footpath 11 of spiral lamination 14mm, the path of spiral lamination be 6 7mm; The outer wall of outer tube is provided with multilayer fin around even tube wall, and inner sleeve is hollow pipe, and inner sleeve is concordant with the bottom of outer tube; The annular gap that the threaded tip of internal thread wall and the outer wall of inner sleeve are formed, the spacing of annular gap is 1 ~ 2mm.The utility model is all strengthened the fluid heat transferring inside and outside pipe, improves the inside and outside heat transfer coefficient of pipe simultaneously, effectively slow down ice formation issues bottom heat exchanger tube, can effectively reduce vaporizer size, save metal material, reduce energy consumption.
Description
Technical field:
The utility model relates to a kind of generating tube for heat exchange, particularly relates to a kind of spiral generating tube of liquified natural gas vaporizer, is the heat exchanger tube of open-frame type vaporizer.
Background technology
LNG/LPG is as the fuel greatly developed at present and industrial chemicals, clean with it, efficient, be convenient to accumulating and price is relatively low etc. that advantage enjoys people to pay close attention to.In use, LNG/LPG just need can be used as fuel or Chemical Manufacture raw material after being vaporizated into gas.Therefore, vaporizer utilizes in process at LNG/LPG and plays a very important role.
At present, coastal large-scale receiving station uses the open-frame type vaporizer using seawater as thermal source usually.The basic heat transfer unit of open-frame type vaporizer is generating tube.Form tabular by some generating tubes to arrange, two ends are welded with discharge or collector tube and are formed pipe bundle plate, then form vaporizer by some pipe bundle plates.Entered people by the working medium heated from bottom house steward, be then assigned in each little heat exchanger tube.Flow from bottom to top in heat-exchanging tube bundle.Seawater distribution device is equipped with at vaporizer top, and seawater enters people by top, becomes film-form evenly to decline along tube bank outer wall, transfer heat to intraductal working medium simultaneously through seawater distributor.
The core cell of vaporizer is generating tube.Under normal pressure, LNG temperature Yue Wei ?163 DEG C, LPG temperature Yue Wei ?42 DEG C.Because its temperature is lower, in vaporescence, be easy to bottom generating tube icing phenomenon occurs, cause the reduction of heat exchanger tube efficiency thus, affect the normal use of vaporizer.
For large-scale open-frame type vaporizer, because thermic load is comparatively large, use the vaporizer of common heat exchanger tube, overall structure size is also comparatively large, but excessive size often limits convenience and the performance boost of vaporizer.Researchers are developing always and are reducing vaporizer size and keep the constant effective and feasible method even promoted of its vaporization capacity simultaneously, but do not have suitable solution so far.
Utility model content
The purpose of this utility model is for prior art Problems existing, there is provided one effectively to overcome bottom generating tube and easily icing phenomenon occurs, vaporization capacity is strong, and vapor lamp size is little, the especially suitable spiral generating tube using the liquified natural gas vaporizer of common heat exchanger tube.
The purpose of this utility model is realized by following technical method:
A spiral generating tube for liquified natural gas vaporizer, is integrally connected to form by vaporization section and bringing-up section, and the inner sleeve established in outer tube and its one end combines and forms vaporization section, does not establish the outer tube of inner sleeve to form bringing-up section; Vaporization segment length 2 ?3 meters; The inwall of described outer tube is inner thread; Inner thread is spiral lamination, the height of spiral lamination be 5 ?7mm, the large footpath 11 of spiral lamination ?14mm, the path of spiral lamination be 6 ?7mm; The outer wall of outer tube is provided with multilayer fin around even tube wall, and the fin of every one deck is 6-10, and the outer wall around outer tube is uniformly distributed, and each fin comprises main fin, the first secondary fin and the second secondary fin; Main fin stretches out from outer tube outer wall toward periphery, and shape is rectangle, and the first secondary fin and the second secondary fin are arc-shaped, are disposed on main fin, are symmetric in main fin both sides, and the thickness of pipe wall of outer tube is 1 ~ 1.5 times of thread depth; The large footpath of described spiral lamination is the distance of outer tube cross-section center point to inner thread bottom, and the path of described spiral lamination is the distance of outer tube cross-section center point to inner thread top;
Described inner sleeve is hollow pipe, and inner sleeve is concordant with the bottom of outer tube; The annular gap that the threaded tip of internal thread wall and the outer wall of inner sleeve are formed, the spacing of annular gap is 1 ~ 2mm.
For realizing the utility model object further, preferably, described inner thread is rectangular thread, rectangle is wide be 3 ?5mm, number of leads n be 4, pitch P is 20-25mm.
The sheet height of described main fin be 80 ?120mm, thickness is 2-3mm.
Described first secondary fin arc radius is 40mm, and overall radian is 90-150 °, and the distance of distance outer tube is 30-40mm.
Described second secondary fin 8 ?2 arc radiuses be 20mm, overall radian is 90-150 °, and the distance of distance outer tube 5 is 60-80mm.
Described inner sleeve and outer concentric tube are installed; The wall thickness of inner sleeve be 1 ?2mm.
The length of described bringing-up section is 5 ~ 6 meters.
The cross section of described spiral lamination is rectangle.
Described first secondary fin and the second secondary fin by welding processing in main fin both sides.
Described main fin by machinery cover packing technique and outer tube affixed; Described inner thread is by cutting tapping, cold extrusion or the processing of high-speed milling technology.
Compared with prior art, the utility model and utility model have following characteristics:
1) the utility model is according to fluid in Bottomhole pressure state, generating tube is divided into vaporization section and bringing-up section two parts.For vaporization section part in pipe, by adopting the two-layer pipe of an inner sleeve design, fluid liquid flows through inner sleeve inner flow passage, and for the back of the body after vaporization is bled gas in annular gap, generating tube outer fluid is by the gas indirect in annular gap and make vaporizing liquid.This structure is improved when making the outer wall temperature of generating tube compare direct contact LNG/LPG, is easier to remain on more than 0 DEG C, thus effectively alleviates the icing phenomenon of generating tube bottom outer wall.
2) the utility model is by adopting inside spin structure, makes fluid in runner because the effect of pressure reduction produces Secondary Flow, and then produces eddy current, increase fluid boundary layer disturbance, impel the rambling motion of fluid particle, strengthen with the heat conduction of molecular diffusion heat transfer.Meanwhile, fluid is after spiral near wall place produces eddy current, and its wake flow departs from solid boundaries constraint in a segment distance, and then impacts wall formation jet.The formation of jet can strengthen bottoms stream Radial Perturbation, forces heat to enter into bodies of fluid by bottoms stream.Simultaneously, fluid constantly carries out the formation in boundary layer, development and separation process in spiral enhanced tube, suitably adjusts pitch, makes boundary layer in spiral enhanced tube, fail abundant development and just starts to be separated, can effective thinning boundary layer thickness, thus reach the object of augmentation of heat transfer.
3) seawater distribution device is equipped with at vaporizer top, seawater enters people by top, film-form is become evenly to decline along outer tube through seawater distributor, the heat that the arc-shaped of the secondary fin of the utility model first and the second secondary fin is distributed after coordinating the seawater and absorption becoming film-form evenly to decline along outer tube through seawater distributor, easily form mist membrane structure at the second secondary fin between the first secondary fin and the first secondary fin to outer tube wall, improve generating tube exchange capability of heat, thus improve vaporization efficency.
4) the utility model improves generating tube inner flow passage, control the height of spiral lamination be 5 ?7mm, be conducive to promoting the turbulence of tube fluid and weakening boundary layer thickness, augmentation of heat transfer, and the design of the outer major-minor fin of pipe makes seawater at outer tube wall profile mist formation membrane structure, the thickness of pipe wall that can realize outer tube is 1 ~ 1.5 times of thread depth, the large footpath 11 of spiral lamination ?14mm, the path of spiral lamination be 6 ?7mm, realize vapor lamp compact in size, especially the common heat exchanger tube of suitable use, effectively saves metal material, reduces energy consumption.
5) the utility model increases the secondary fin of two panels arc-shaped in the main fin both sides of every sheet, and by increasing the secondary fin of arc-shaped, heat transfer outside a tube area obtains larger expansion, further ensures the vaporization capacity of heat exchanger tube.
6) strengthen while the utility model pipe internal-external heat exchanger ability, generating tube Composite Walls is significantly improved, and generating tube exchange capability of heat significantly strengthens.
Accompanying drawing explanation
Fig. 1 is the structural representation of the spiral generating tube of the utility model liquified natural gas vaporizer;
Fig. 2 is the vaporization section cross-sectional view in Fig. 1;
Fig. 3 is the bringing-up section cross-sectional view in Fig. 1;
Fig. 4 is the schematic diagram of the inner thread in Fig. 1.
Shown in figure: vaporization section 1, bringing-up section 2, inner sleeve 3, annular gap 4, outer tube 5, inner thread 6, main fin 7, the first secondary fin 8 ?1 and second secondary fin 8 ?2.
Detailed description of the invention
For understanding the utility model better, below in conjunction with accompanying drawing, the utility model is further described, but embodiment of the present utility model is not limit so.
As shown in figure 1 ?4, a kind of spiral generating tube of liquified natural gas vaporizer, is integrally connected to form by vaporization section 1 and bringing-up section 2, and the inner sleeve 3 established in outer tube 5 and its one end combines and forms vaporization section 1, and the outer tube 5 on inner sleeve 3 forms bringing-up section 2; Long 2 ~ 3 meters of vaporization section 1, long 5 ~ 6 meters of preferred bringing-up section 2; The inwall of outer tube 5 is inner thread 6; Inner thread 6 is spiral lamination, the height of spiral lamination be 5 ?6mm, the large footpath 11 of spiral lamination ?14mm, the path of spiral lamination be 6 ?7mm; The outer wall of outer tube 5 is provided with multilayer fin around even tube wall, and the fin of every one deck is 6 ~ 10, and the outer wall around outer tube is uniformly distributed, and each fin comprises secondary fin 8 ?1 and the second secondary fin 8 ?2 of main fin 7, first; Main fin 7 is the outer horizontal fin sheet of pipe, and stretch out from outer tube outer wall toward periphery, shape is rectangle, and preferred fin height is 80 ?120mm, and thickness is 2-3mm; First secondary fin 8 ?1 and second secondary fin 8 ?2 be arc-shaped, circular arc is convex in outer tube, be disposed on main fin 7, be symmetric in main fin 7 both sides, the first secondary fin 8 ?1 arc radius be 40mm, overall radian is 90-150 °, the distance of distance outer tube 5 is 30-40mm, second secondary fin 8 ?2 arc radiuses be 20mm, overall radian is 90-150 °, and the distance of distance outer tube 5 is 60-80mm; The thickness of pipe wall of outer tube 5 is preferably 2 ~ 3 times of thread depth H.
Inner thread 6 is preferably rectangular thread, wherein the wide A of rectangle be 3 ?5mm, high H be 5 ?6mm, the large footpath R1 of screw thread be 13 ?14mm, path R2 be 6 ?7mm, number of leads n be 4, pitch P is 20-25mm; Large footpath R1 is the distance of outer tube cross-section center point to inner thread 6 bottom, and path R2 is the distance of outer tube cross-section center point to inner thread 6 top.
Inner sleeve 3 is hollow pipe, and be preferably hollow aluminum pipe, inner sleeve 3 is concordant with the bottom of outer tube 5; The annular gap 4 that the threaded tip of internal thread wall 6 and the outer wall of inner sleeve 3 are formed, the spacing of annular gap 4 is 1 ~ 2mm; Annular gap 4 is inner wall smooths, and outer wall has the gap of thread perturbation; Preferably, inner sleeve 3 is installed with outer tube 5 is concentric; The wall thickness of preferred inner sleeve 3 be 1 ?2mm;
Inner thread 6 is usually by cutting the method processing such as tapping, cold extrusion or high-speed milling technology; First secondary fin 8 ?1 and second secondary fin 8 ?2 by welding processing in main fin both sides.Main fin 7 by machinery cover packing technique and outer tube 5 affixed.
During application, the liquefied natural gas (LNG) of the low temperature (-162 DEG C) of storage tank, through low temperature delivery pump, enters the lower inlet of vaporizer; Low temperature LNG is divided into two parts by inner sleeve, and a part is LNG in pipe, and another part is annular gap LNG; High temperature seawater (5 ~ 25 DEG C), from the top spray outer tube 5 of vaporizer, forms stable seawater fluidised form, for the vaporization of LNG provides thermal source.Because annular gap 4 is only 1 ~ 2mm, annular gap 4 outer wall is threaded walls, so its heat exchange efficiency is high, annular gap LNG rapid temperature increases is vaporizated into NG, and continues NG to be heated to higher temperature; In pipe, LNG is then by the NG indirect vaporization in annular gap, its vaporization rate is slow, the existence of inner sleeve 3 effectively slow down the problem that the coefficient of heat transfer that causes because freezing bottom heat exchanger tube significantly reduces, this is because the setting of inner sleeve avoids, the low temperature LNG of all imports is directly disposable carries out heat exchange with outer wall, but by interior pipe, the low temperature LNG in pipe is divided into two parts (annular gap part and inner pipe portion), thus slow down the burden of bottom heat exchange, slow down the Heat exchanger freezing and bring; External finned tube is combined with secondary fin by main fin, substantially increases the contact area of vaporizer and seawater, thus improves heat exchange efficiency.Compared with the vaporizer required with equal thermic load, novel finned tube compact conformation of the present utility model, heat exchange efficiency is high.
Generating tube is divided into vaporization section 1 and bringing-up section 2 two parts by the utility model.For vaporization section part in pipe, by adopting the two-layer pipe of an inner sleeve design, fluid liquid flows through inner sleeve 3 inner flow passage, and for the back of the body after vaporization is bled gas in annular gap 4, generating tube outer fluid is by the gas indirect in annular gap and make vaporizing liquid.This structure is improved when making the outer wall temperature of generating tube compare direct contact LNG/LPG, is easier to remain on more than 0 DEG C, thus effectively alleviates the icing phenomenon of generating tube bottom outer wall.
Researchers are developing always and are reducing vaporizer size and keep the constant effective and feasible method even promoted of its vaporization capacity simultaneously.The utility model improves generating tube inner flow passage, control the height of spiral lamination be 5 ?7mm, be conducive to promoting the turbulence of tube fluid and weakening boundary layer thickness, augmentation of heat transfer; The outer wall of outer tube 5 is provided with multilayer fin around even tube wall, and the fin of every one deck is 6 ~ 10, and the outer wall around outer tube is uniformly distributed, and each fin comprises secondary fin 8 ?1 and the second secondary fin 8 ?2 of main fin 7, first; The design of managing outer major-minor fin makes seawater at outer tube wall profile mist formation membrane structure, improve generating tube exchange capability of heat, thus raising vaporization efficency, long 2 ~ 3 meters of design vaporization section 1 can meet the problem avoiding freezing, and the thickness of pipe wall that can realize outer tube is 1 ~ 1.5 times of thread depth, the large footpath of spiral lamination 11 ?14mm, the path of spiral lamination be 6 ?7mm, realize vapor lamp compact in size, especially the common heat exchanger tube of suitable use.
The utility model, by adopting inside spin structure, makes fluid in runner because the effect of pressure reduction produces Secondary Flow, and then produces eddy current, increase fluid boundary layer disturbance, impel the rambling motion of fluid particle, strengthen with the heat conduction of molecular diffusion heat transfer.Meanwhile, fluid is after spiral near wall place produces eddy current, and its wake flow departs from solid boundaries constraint in a segment distance, and then impacts wall formation jet.The formation of jet can strengthen bottoms stream Radial Perturbation, forces heat to enter into bodies of fluid by bottoms stream.Simultaneously, fluid constantly carries out the formation in boundary layer, development and separation process in spiral enhanced tube, suitably adjusts pitch, makes boundary layer in spiral enhanced tube, fail abundant development and just starts to be separated, can effective thinning boundary layer thickness, thus reach the object of augmentation of heat transfer.
The utility model increases the secondary fin of two panels arc-shaped in the main fin both sides of every sheet, by increasing the secondary fin of arc-shaped, heat transfer outside a tube area obtains larger expansion, further ensures the vaporization capacity of heat exchanger tube.
Strengthen while the utility model pipe internal-external heat exchanger ability, generating tube Composite Walls is significantly improved, and generating tube exchange capability of heat significantly strengthens.
Claims (10)
1. the spiral generating tube of liquified natural gas vaporizer, is characterized in that integrally being connected to form by vaporization section and bringing-up section, and the inner sleeve established in outer tube and its one end combines and forms vaporization section, does not establish the outer tube of inner sleeve to form bringing-up section; Vaporization segment length 2 ?3 meters; The inwall of described outer tube is inner thread; Inner thread is spiral lamination, the height of spiral lamination be 5 ?7mm, the large footpath 11 of spiral lamination ?14mm, the path of spiral lamination be 6 ?7mm; The outer wall of outer tube is provided with multilayer fin around even tube wall, and the fin of every one deck is 6 ~ 10, and the outer wall around outer tube is uniformly distributed, and each fin comprises main fin, the first secondary fin and the second secondary fin; Main fin stretches out from outer tube outer wall toward periphery, and shape is rectangle, and the first secondary fin and the second secondary fin are arc-shaped, are disposed on main fin, are symmetric in main fin both sides, and the thickness of pipe wall of outer tube is 1 ?1.5 times of thread depth; The large footpath of described spiral lamination is the distance of outer tube cross-section center point to inner thread bottom, and the path of described spiral lamination is the distance of outer tube cross-section center point to inner thread top;
Described inner sleeve is hollow pipe, and inner sleeve is concordant with the bottom of outer tube; The annular gap that the threaded tip of internal thread wall and the outer wall of inner sleeve are formed, the spacing of annular gap is 1 ~ 2mm.
2. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, described inner thread is rectangular thread, rectangle is wide be 3 ?5mm, number of leads n be 4, pitch P is 20-25mm.
3. the spiral generating tube of liquified natural gas vaporizer according to claim 1, is characterized in that, the sheet height of described main fin be 80 ?120mm, thickness is 2-3mm.
4. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, described first secondary fin arc radius is 40mm, and overall radian is 90-150 °, and the distance of distance outer tube is 30-40mm.
5. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, described second secondary fin arc radius is 20mm, and overall radian is 90-150 °, and the distance of distance outer tube (5) is 60-80mm.
6. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, described inner sleeve and outer concentric tube are installed; The wall thickness of inner sleeve be 1 ?2mm.
7. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, the length of described bringing-up section is 5 ~ 6 meters.
8. the spiral generating tube of liquified natural gas vaporizer according to claim 1, it is characterized in that, the cross section of described spiral lamination is rectangle.
9. the spiral generating tube of liquified natural gas vaporizer according to claim 1, is characterized in that, described first secondary fin and the second secondary fin by welding processing in main fin both sides.
10. the spiral generating tube of liquified natural gas vaporizer according to claim 1, is characterized in that, described main fin by machinery cover packing technique and outer tube affixed; Described inner thread is by cutting tapping, cold extrusion or the processing of high-speed milling technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520289290.6U CN204730719U (en) | 2015-05-06 | 2015-05-06 | The spiral generating tube of liquified natural gas vaporizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520289290.6U CN204730719U (en) | 2015-05-06 | 2015-05-06 | The spiral generating tube of liquified natural gas vaporizer |
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| Publication Number | Publication Date |
|---|---|
| CN204730719U true CN204730719U (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520289290.6U Expired - Fee Related CN204730719U (en) | 2015-05-06 | 2015-05-06 | The spiral generating tube of liquified natural gas vaporizer |
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| Country | Link |
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| CN (1) | CN204730719U (en) |
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2015
- 2015-05-06 CN CN201520289290.6U patent/CN204730719U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20180506 |
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| CF01 | Termination of patent right due to non-payment of annual fee |