CN204325236U - A kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section - Google Patents
A kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section Download PDFInfo
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- CN204325236U CN204325236U CN201420768804.1U CN201420768804U CN204325236U CN 204325236 U CN204325236 U CN 204325236U CN 201420768804 U CN201420768804 U CN 201420768804U CN 204325236 U CN204325236 U CN 204325236U
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Abstract
The utility model provides a kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section, belongs to pyrolyzer field.This device comprises the first journey boiler tube, the second journey boiler tube and the 3rd journey boiler tube; Described first journey boiler tube comprises five 8-shaped cross section boiler tubes, a 8-shaped-rounded transitional pipe fitting and two circular boiler tubes, and described second journey boiler tube comprises two circular boiler tubes, and the 3rd journey boiler tube is a circular boiler tube; The opening end of described first journey boiler tube is positioned at the top, and the opening end of described 3rd journey boiler tube is positioned at bottom; Or the opening end of described first journey boiler tube is positioned at bottom, the opening end of described 3rd journey boiler tube is positioned at the top.
Description
Technical field
The utility model belongs to pyrolyzer field, is specifically related to a kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section.
Background technology
The radiant coil that in petrochemical complex ethylene unit, ethane cracking furnace extensively adopts is configured as two journey boiler tubes and quadruple pass boiler tube, and three journey pipes also do not have application in ethane cracking furnace.
As depicted in figs. 1 and 2, two journey 2-1 types of stone-Robert Webster company exploitation (comprising the first journey boiler tube 1 ' and the second journey boiler tube 2 and transition conduit 5 and Y-piece 6 ') and quadruple pass 2-1-1-1 type boiler tube (comprising the first journey boiler tube 1 ', second journey boiler tube 2, the 3rd journey boiler tube 3 and quadruple pass boiler tube 4 and transition conduit 5 and Y-piece 6 ') for typically regardless of branch adapter bonnet, the caliber of these two kinds of boiler tubes is by Cheng Fang great, but the pipe number of every journey is all 1, and the residence time is about 0.15s-0.3s.Two journey 2-1 type boiler tube length are short compared with quadruple pass 2-1-1-1 type boiler tube, and the residence time is also shorter, and pressure drop is also less; Comparatively two journey 2-1 type boiler tubes are long for quadruple pass 2-1-1-1 type boiler tube, and the residence time is also slightly long, and pressure drop is also larger, but throughput is large compared with two journey 2-1 type boiler tubes.
At present, no matter be that two journey 2-1 types and quadruple pass 2-1-1-1 type boiler tube are arranged, radiating furnace tube entrance and exit is all at pyrolyzer radiation furnace roof, be arranged in the small space of furnace roof across pipe, furnace tube spring hanger system and waste heat boiler, their rational, collisionless layouts are the difficult points of engineering design always.
On the other hand, two journey 2-1 types designed by cracking of ethylene technology provider important in the world and quadruple pass 2-1-1-1 type boiler tube all adopt circular boiler tube, as depicted in figs. 1 and 2.
With existing 2-1-1-1 type boiler tube, be balanced production ability and scission reaction characteristic, in boiler tube arrangement, arrangement closely, and tube spacing is less; First and second journey boiler tube needs to adopt the boiler tube compared with pipe with small pipe diameter, and third and fourth journey boiler tube adopts the boiler tube compared with Large Diameter Pipeline.The throughput of single group boiler tube will be brought so less, cover more and more serious between adjacent boiler tube, thus cause same boiler tube high by counter-fire surface temperature during double-side radiation heat transfer, being masked between adjacent boiler tube, it is lower to affect temperature, actual effective heat exchange area is caused to reduce, boiler tube is heated uneven, and result is the easy coking in high-temperature zone, the flexible distortion of boiler tube.
At present, to be heated the shortcomings such as uneven, easy coking for existing boiler tube, in order to the heat transfer effect of enhanced rad boiler tube, alleviate coking degree, prolong operation cycle, a kind of heat transfer enhancement technology that pyrolyzer extensively adopts increases enhancement of heat transfer parts on radiating furnace tube, and these parts can effectively reduce the frictional belt of tube fluid, there is the effect strengthening heat exchange, increase heat absorption, thus prolong operation cycle.Current most widely used a kind of technology is exactly increase twisted sheet between the pipeline section of boiler tube.Twisted sheet is an independent static cast component, and boiler tube is that rotary casting forms, and the pipe fitting of these two kinds of different manufacture method and pipeline section can affect on heat-transfer effect and mechanical property to radiant coil after being assembled into radiant coil.Twisted sheet, because of its constructional feature, easily blocks, affects use safety in its use procedure.
Utility model content
The purpose of this utility model is to solve the difficult problem existed in above-mentioned prior art, a kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section is provided, it has the feature of two journey 2-1 type boiler tubes compared with short residence time(SRT) and low pressure drop, there is again the feature that quadruple pass 2-1-1-1 type boiler tube throughput is larger, three journey 5-2-1 type radiating furnace tube material bottom in and top out or upper entering and lower leavings; Meanwhile, this boiler tube configuration first journey boiler tube is 8-shaped cross section, and this kind of configuration improves cracking technology performance, improves throughput, has good mechanical properties simultaneously.
The utility model is achieved through the following technical solutions:
The 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section, comprises the first journey boiler tube, the second journey boiler tube and the 3rd journey boiler tube;
Described first journey boiler tube comprises five 8-shaped cross section boiler tubes, a 8-shaped-rounded transitional pipe fitting and two circular boiler tubes, and described second journey boiler tube comprises two circular boiler tubes, and the 3rd journey boiler tube is a circular boiler tube;
The opening end of described first journey boiler tube is positioned at the top, and the opening end of described 3rd journey boiler tube is positioned at bottom;
Or the opening end of described first journey boiler tube is positioned at bottom, the opening end of described 3rd journey boiler tube is positioned at the top.
One end of five 8-shaped cross section boiler tubes of described first journey boiler tube is connected respectively to the inlet end of 8-shaped-rounded transitional pipe fitting, the exit end of 8-shaped-rounded transitional pipe fitting is connected with one end of the circular boiler tube in described first journey boiler tube, the other end of the circular boiler tube of the every root in described first journey boiler tube is connected by U-tube one end with the second journey boiler tube, the other end of two circular boiler tubes of the second journey boiler tube is connected with the inlet end of Y-piece respectively, the exit end of Y-piece is connected with the one end across pipe, and the other end across pipe is connected with one end of the 3rd journey boiler tube.
A Venturi tube is provided with in the circular boiler tube of every root in the second journey pipe.
The cross section of the inner chamber of described 8-shaped cross section boiler tube is intersected by the circle of two equal diameters; Two radius of a circles are R, and the crossing height of two circles is h, 20mm≤R≤40mm, R/3≤h≤R/2.
The cross section of the outside surface of described 8-shaped cross section boiler tube is oval.
Or the cross section of the outside surface of described 8-shaped cross section boiler tube is intersected by the circle of two equal diameters.
Described 8-shaped-rounded transitional pipe fitting is 5-2 type, its inlet end is divided into five branches, the cross section of the inner chamber of each branch is 8-shaped, its size is identical with the inner chamber of described 8-shaped cross section boiler tube, its exit end is divided into Liang Ge branch, the cross section of the inner chamber of each branch is circular, and its size is identical with the inner chamber of the circular boiler tube in described first journey boiler tube, is the transition section from 8-shaped to circle between the inlet end of described 8-shaped-rounded transitional pipe fitting and exit end.
The length of 8-shaped cross section boiler tube described in every root is the overall length of the 1, first journey boiler tube is L, L/3≤1≤L.
The major axis of the cross section of 8-shaped cross section boiler tube described in every root and the center line angle of radiant heat zone are α, and 0 °≤α≤30 °;
In described 8-shaped-rounded transitional pipe fitting, the major axis in 8-shaped cross section and the center line angle of radiant heat zone are α, and 0 °≤α≤30 °.
Described first journey boiler tube, the second journey boiler tube are vertical hanging with each boiler tube in the 3rd journey boiler tube, and the axis of 8-shaped cross section boiler tube and circular boiler tube is all perpendicular to the center line of radiant heat zone;
The medullary ray of each boiler tube in described first journey boiler tube, the second journey boiler tube and the 3rd journey boiler tube along the distribution of radiation chamber center line, and is positioned in same plane.
Compared with prior art, the beneficial effects of the utility model are:
(1) the utility model has the feature of two journey 2-1 type boiler tubes compared with short residence time(SRT) and low pressure drop, has again the feature that quadruple pass 2-1-1-1 type boiler tube throughput is larger, improves processing performance to a certain extent; The mode that three journey 5-2-1 type radiating furnace tubes can be taked material furnace bottom to enter furnace roof to go out, make to be arranged in the spring hanger system layout of furnace bottom, waste heat boiler and part boiler tube at furnace roof across pipe, add the handiness of furnace roof spatial arrangement, bring facility to engineering construction;
(2) first journey pipes are the 5-2-1 type boiler tubes in 8-shaped cross section, comparatively prior art 2-1 and the circular boiler tube of 2-1-1-1 type increase specific surface area, be conducive to a large amount of heat absorptions of scission reaction initial period, be conducive to the generation of scission reaction and throughput is larger;
(3) first journey tube outer surfaces are 8-shaped or similar ellipse, its more circular boiler tube reduces the bridging effect between adjacent boiler tube, ensure the uniformity of temperature profile in the circumferential surface of boiler tube footpath, alleviate the degree of coking, and then extend the cycle of operation of pyrolyzer;
(4) cross section of 8-shaped cross section boiler tube is intersected by two circles to form, this kind of structure has obvious enhancement of heat transfer effect, just can reach the effective effect reducing tube fluid frictional belt, increase heat-transfer effect without the need to increasing extra enhancement of heat transfer parts, and have mechanical property and heat-transfer effect continuous print feature.
Accompanying drawing explanation
Two journey 2-1 type boiler tube configurations of Fig. 1 prior art
The quadruple pass 2-1-1-1 type boiler tube configuration of Fig. 2 prior art
Fig. 3 the utility model three journey 5-2-1 type boiler tube configuration
Fig. 4 boiler tube sectional view 1 of the present invention
Fig. 5 boiler tube sectional view 2 of the present invention
Fig. 6 8-shaped boiler tube horizontal arrangement figure
Fig. 7 8-shaped boiler tube α angle layout viewing
1-first journey boiler tube (8-shaped boiler tube); 1 '-the first journey boiler tube (circular boiler tube); 2-second journey boiler tube; 3-the 3rd journey boiler tube; 4-quadruple pass boiler tube; 5-transition conduit; 6-8 font-rounded transitional pipe fitting; 6 '-Y-piece; 7-Venturi tube; 20-radiation section center line.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Particularly, in order to overcome the shortcoming of existing 2-1 and 2-1-1-1 type boiler tube, as shown in Figure 3, the utility model first journey boiler tube 1 adopts 8-shaped cross section boiler tube, and the second journey boiler tube 2 and the 3rd journey pipe 3 are circular boiler tube.
The lower end of the 8-shaped cross section boiler tube of described first journey boiler tube 1 is connected respectively to the upper end of 8-shaped-rounded transitional pipe fitting 6, the lower end of 8-shaped-rounded transitional pipe fitting 6 is connected with the upper end of the circular boiler tube in described first journey boiler tube 1, the lower end of this circular boiler tube is connected by the lower end of U-tube with the second journey boiler tube 2, in each second journey pipe 2, a Venturi tube 7 is set, the upper end of the second journey boiler tube 2 is connected with Y-piece 6 ' one end, Y-piece 6 ' the other end is connected with the one end across pipe, and the other end across pipe is connected with the upper end of the 3rd journey boiler tube 3.
Embodiment 1
As shown in Figure 3 and Figure 4, the first journey boiler tube is 8-shaped cross section boiler tube, second and three journey pipe be the 5-2-1 type boiler tube of circular boiler tube.Each boiler tube in radiating furnace tube configuration is vertical hanging, and perpendicular to the center line 20 of described radiant heat zone.Adopt 8-shaped-rounded transitional pipe fitting and U-tube to connect between first journey 8-shaped cross section boiler tube and the circular boiler tube of the second journey, the structure of 8-shaped-rounded transitional pipe fitting is to two round configuration transition by the configuration in five 8-shaped cross sections.
First journey 8-shaped cross section boiler tube and second and the medullary ray of the circular boiler tube of three journeys along the distribution of radiation chamber center line, and the first journey 8-shaped cross section boiler tube and second and the medullary ray of the circular boiler tube of three journeys be positioned in same plane.
The major axis of cross section and the center line angle of radiant heat zone of the first journey 8-shaped cross section boiler tube are 0 °, namely horizontal, 8-shaped to the 8-shaped cross section in circle transition fitting and the center line angle of radiant heat zone be 0 ° as shown in Figure 6, in addition, major axis, the 8-shaped of the cross section of the first journey 8-shaped cross section boiler tube are α ° to the center line angle of the 8-shaped cross section in circle transition fitting and radiant heat zone, namely arrangement is rotated, as shown in Figure 7.α ° of arrangement can shorten the spacing of arranging along center line, can arrange some boiler tubes more like this, can bring the raising on cracking ability, improve output to a certain extent.
Boiler tube cross section, 8-shaped cross section internal surface is formed by two circles are crossing, similar 8-shaped shape, the similar elliptical shape of outside surface.Intersect radius of circle R=30mm, intersecting circle crossing is highly h=15mm.First journey boiler tube total length L=10000mm, the long l=5000mm of 8-shaped cross section boiler tube (the 1 actual length including 8-shaped cross section boiler tube and transition fitting, defines the ratio of top and the bottom like this from operational characteristic).
Embodiment 2
As shown in Figure 3 and Figure 5, the 5-2-1 type boiler tube of the first journey boiler tube to be 8-shaped cross section boiler tube 1, the second and three journey pipe be circular boiler tube.Each boiler tube in radiating furnace tube configuration is vertical hanging, and perpendicular to the center line of described radiant heat zone.Adopt class 8-shaped cross section-circle transition fitting to connect between first journey 8-shaped cross section boiler tube and the circular boiler tube of the second journey, its structure is to two round configuration transition by the configuration in five 8-shaped cross sections.
First journey 8-shaped cross section boiler tube and second and the medullary ray of the circular boiler tube of three journey pipes along the distribution of radiation chamber center line, and the first journey 8-shaped cross section boiler tube and second and the medullary ray of the circular boiler tube of three journey pipes be positioned in same plane.
The center line angle of the first journey 8-shaped cross section boiler tube and radiant heat zone is 0 °, namely horizontally.8-shaped cross section in 8-shaped-circle transition fitting and the center line angle of radiant heat zone are 0 °, as shown in Figure 6, also can become certain angle, as shown in Figure 7.
Boiler tube cross section, 8-shaped cross section is welded by two pipes are crossing, and its global shape is similar to 8-shaped configuration.Intersect radius of circle R=30mm, intersecting circle crossing is highly h=15mm.First journey boiler tube total length L=10000mm, the long l=5000mm of 8-shaped cross section boiler tube.
The utility model provides a kind of ethane cracking furnace 5-2-1 type radiating furnace tube, it has the feature of two journey 2-1 type boiler tubes compared with short residence time(SRT) and low pressure drop, there is again the feature that quadruple pass 2-1-1-1 type boiler tube throughput is larger, improve processing performance to a certain extent; Three journey 5-2-1 type radiating furnace tubes not only can take the mode that material furnace roof enters, furnace bottom goes out, also mode material furnace bottom can being taked to enter furnace roof go out, namely the opening end of the first journey boiler tube is positioned at bottom, from bottom feed, the opening end of the 3rd journey boiler tube is positioned at the top, from top discharge, makes to be arranged in the spring hanger system layout of furnace bottom, waste heat boiler and part boiler tube at furnace roof across pipe, add the handiness of furnace roof spatial arrangement, bring facility to engineering construction; First journey pipe adopts 8-shaped cross section boiler tube, increases the first journey pipe heat transfer sheet area, improves throughput, reduce the bridging effect of adjacent boiler tube, improve effective heat exchange area, make radiative transfer more even; There is enhancement of heat transfer effect, reduce tube fluid frictional belt, have the effect increasing heat-transfer effect.
Technique scheme is several the most typical embodiment of the present utility model, for those skilled in the art, on the basis that the utility model discloses application method and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the utility model, therefore previously described mode is just preferred, and does not have restrictive meaning.The utility model radiant coil can be used for newly-built pyrolyzer or carries out capacity expansion revamping to pyrolyzer.
Claims (10)
1. the ethane cracking furnace 5-2-1 type radiating furnace tube in 8-shaped cross section, is characterized in that: the 5-2-1 type radiating furnace tube in described ethane cracking furnace 8-shaped cross section, comprises the first journey boiler tube, the second journey boiler tube and the 3rd journey boiler tube;
Described first journey boiler tube comprises five 8-shaped cross section boiler tubes, a 8-shaped-rounded transitional pipe fitting and two circular boiler tubes, and described second journey boiler tube comprises two circular boiler tubes, and the 3rd journey boiler tube is a circular boiler tube;
The opening end of described first journey boiler tube is positioned at the top, and the opening end of described 3rd journey boiler tube is positioned at bottom;
Or the opening end of described first journey boiler tube is positioned at bottom, the opening end of described 3rd journey boiler tube is positioned at the top.
2. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 1, it is characterized in that: one end of five 8-shaped cross section boiler tubes of described first journey boiler tube is connected respectively to the inlet end of 8-shaped-rounded transitional pipe fitting, the exit end of 8-shaped-rounded transitional pipe fitting is connected with one end of the circular boiler tube in described first journey boiler tube, the other end of the circular boiler tube of the every root in described first journey boiler tube is connected by U-tube one end with the second journey boiler tube, the other end of two circular boiler tubes of the second journey boiler tube is connected with the inlet end of Y-piece respectively, the exit end of Y-piece is connected with the one end across pipe, the other end across pipe is connected with one end of the 3rd journey boiler tube.
3. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 2, is characterized in that: be provided with a Venturi tube in the circular boiler tube of the every root in the second journey pipe.
4. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 3, is characterized in that: the cross section of the inner chamber of described 8-shaped cross section boiler tube is intersected by the circle of two equal diameters; Two radius of a circles are R, and the crossing height of two circles is h, 20mm≤R≤40mm, R/3≤h≤R/2.
5. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 4, is characterized in that: the cross section of the outside surface of described 8-shaped cross section boiler tube is for oval.
6. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 4, is characterized in that: the cross section of the outside surface of described 8-shaped cross section boiler tube is intersected by the circle of two equal diameters.
7. the 5-2-1 type radiating furnace tube in 8-shaped cross section of the ethane cracking furnace according to claim 5 or 6, it is characterized in that: described 8-shaped-rounded transitional pipe fitting is 5-2 type, its inlet end is divided into five branches, the cross section of the inner chamber of each branch is 8-shaped, its size is identical with the inner chamber of described 8-shaped cross section boiler tube, its exit end is divided into Liang Ge branch, the cross section of the inner chamber of each branch is circular, its size is identical with the inner chamber of the circular boiler tube in described first journey boiler tube, it is the transition section from 8-shaped to circle between the inlet end of described 8-shaped-rounded transitional pipe fitting and exit end.
8. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 6, is characterized in that: described in every root, the length of 8-shaped cross section boiler tube is l, and the overall length of the first journey boiler tube is L, L/3≤l≤L.
9. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 8, is characterized in that: the major axis of cross section and the center line angle of radiant heat zone of 8-shaped cross section boiler tube described in every root are α, and 0 °≤α≤30 °;
In described 8-shaped-rounded transitional pipe fitting, the major axis in 8-shaped cross section and the center line angle of radiant heat zone are α, and 0 °≤α≤30 °.
10. the 5-2-1 type radiating furnace tube in ethane cracking furnace 8-shaped cross section according to claim 9, it is characterized in that: described first journey boiler tube, the second journey boiler tube are vertical hanging with each boiler tube in the 3rd journey boiler tube, the axis of 8-shaped cross section boiler tube and circular boiler tube is all perpendicular to the center line of radiant heat zone;
The medullary ray of each boiler tube in described first journey boiler tube, the second journey boiler tube and the 3rd journey boiler tube along the distribution of radiation chamber center line, and is positioned in same plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768804.1U CN204325236U (en) | 2014-12-09 | 2014-12-09 | A kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768804.1U CN204325236U (en) | 2014-12-09 | 2014-12-09 | A kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section |
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| Publication Number | Publication Date |
|---|---|
| CN204325236U true CN204325236U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420768804.1U Expired - Fee Related CN204325236U (en) | 2014-12-09 | 2014-12-09 | A kind of 5-2-1 type radiating furnace tube of ethane cracking furnace 8-shaped cross section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204325236U (en) |
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2014
- 2014-12-09 CN CN201420768804.1U patent/CN204325236U/en not_active Expired - Fee Related
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Granted publication date: 20150513 Termination date: 20151209 |
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