CN204198673U - A kind of ethane cracking furnace one-way radiating furnace tube - Google Patents
A kind of ethane cracking furnace one-way radiating furnace tube Download PDFInfo
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- CN204198673U CN204198673U CN201420675763.1U CN201420675763U CN204198673U CN 204198673 U CN204198673 U CN 204198673U CN 201420675763 U CN201420675763 U CN 201420675763U CN 204198673 U CN204198673 U CN 204198673U
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- ethane cracking
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Abstract
The utility model provides a kind of ethane cracking furnace one-way radiating furnace tube, belongs to pyrolyzer field.Described ethane cracking furnace one-way radiating furnace tube comprises the oval pipe on top and the pipe of bottom, and described oval pipe and pipe are coaxially set; The lower end of described oval pipe is connected by the upper end of transition fitting with described pipe.The utility model increases specific surface area in the upper part of radiating furnace tube, reduces the bridging effect of adjacent boiler tube, improves effective heat exchange area, makes radiative transfer more even; In the lower part of radiating furnace tube, adopt larger circular boiler tube, reduce hydrocarbon partial pressure in the cracking reflection later stage, reduce specific surface area, reduce the carrying out of thermo-negative reaction, thus alleviate the generation of coking, extend the operational cycle.
Description
Technical field
The utility model belongs to pyrolyzer field, is specifically related to a kind of ethane cracking furnace one-way radiating furnace tube.
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 the application of one way pipe in ethane cracking furnace only has millisecond furnace.
Millisecond furnace adopts one way boiler tube, and pipe range about 12m, the residence time is down to below 0.1s.One way boiler tube more journey boiler tube pipe range shortens to some extent, also reduces the pressure drop of material in boiler tube simultaneously, and pressure drop drops to 0.04MPa or lower from original about 0.15MPa, because hydrocarbon partial pressure declines, the selectivity of cracking is improved.But shorter pipe range also brings the shortcoming of heat-transfer surface deficiency, for addressing this problem, can increase the temperature of cracking on the one hand, increasing the hot strength of tube skin, this just needs the material grade improving boiler tube.Present stage with regard to the development of material to a bottleneck.On the other hand, the specific surface area of boiler tube can be increased, adopt pipe with small pipe diameter.
But for one way boiler tube, in the later stage of reaction, from the viewpoint of Pressure Drop, because now transformation efficiency is higher, tube fluid volume increases more, so that linear velocity increases more, caliber is little and cause pressure drop comparatively seriously, therefore to be advisable with Large Diameter Pipeline; From hot strength aspect, because transformation efficiency is higher, increases slowly, less demanding to hot strength, therefore the larger impact on heat transfer of caliber is not remarkable; From coking trend aspect, because transformation efficiency is higher, secondary reaction is carrying out, and coking possibility is comparatively large, therefore with compared with Large Diameter Pipeline, with prolong operation cycle.In sum, initial reaction stage should use comparatively pipe with small pipe diameter, and the reaction later stage should with the boiler tube compared with Large Diameter Pipeline.
The boiler tube of the patent business design of all ethane cracking furnaces all adopts circular boiler tube (as shown in Figure 1), add pipe with small pipe diameter boiler tube comparatively responsive to coking, especially boiler tube arrangement is now more and more intensive, cover more and more serious between adjacent boiler tube, this just causes 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, result is the easy coking in high-temperature zone, the flexible distortion of boiler tube.
Utility model content
The purpose of this utility model is to solve the difficult problem existed in above-mentioned prior art, provides a kind of ethane cracking furnace one-way radiating furnace tube, while performance one way boiler tube cracking advantage, farthest improves cracking technology performance.
The utility model is achieved through the following technical solutions:
A kind of ethane cracking furnace one-way radiating furnace tube, comprise the oval pipe on top and the pipe of bottom, described oval pipe and pipe are coaxially set; The lower end of described oval pipe is connected by the upper end of transition fitting with described pipe.
The length of described oval pipe is L1, and the length of described pipe is L2, L1/L2=1/2 ~ 2/3.
The circulation area of described oval pipe is S1, and the circulation area of described pipe is S2, and 0.1256cm
2≤ S1≤0.785cm
2, S1≤S2≤2S1.
Described transition fitting is oval to rounded transitional pipe fitting, and the cross section of the inner chamber of its epimere is oval, and its size is identical with the inner chamber of described oval pipe; The cross section of the inner chamber of its hypomere is circular, and its size is identical with the inner chamber of described pipe, is the transition section from ellipse to circle between described ellipse to the epimere and hypomere of rounded transitional pipe fitting.
Described ethane cracking furnace one-way radiating furnace tube is vertical hanging, and the axes normal of described oval pipe and pipe is in the center line of radiant heat zone.
Compared with prior art, the beneficial effects of the utility model are:
(1) by the oval boiler tube of one-way radiating furnace tube upper part, radiating furnace tube obtains larger specific surface area, thus can absorb heat in a large number, is conducive to the carrying out of initial cracking reaction.
(2) by the oval boiler tube of one-way radiating furnace tube upper part, more circular boiler tube reduces the bridging effect between adjacent boiler tube, improves effective heat interchanging area.
(3) by adopting the circular boiler tube that one-way radiating furnace tube lower part is larger, reducing hydrocarbon partial pressure in the cracking reflection later stage, reducing specific surface area, reduce the carrying out of thermo-negative reaction, thus alleviate the generation of coking, extend the operational cycle.
Accompanying drawing explanation
The one way boiler tube configuration of Fig. 1 prior art.
Fig. 2 one way boiler tube of the present utility model configuration.
The circulating face of the circular boiler tube in Fig. 3 the utility model.
The circulating face of the oval boiler tube in Fig. 4 the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Particularly, in order to overcome the shortcoming that existing one way boiler tube total length is all isometrical circular boiler tube, the utility model adopts one way boiler tube top to be divided into oval boiler tube, and bottom is divided into the configuration of round kiln pipe.Increase one way boiler tube upper part heat transfer sheet area, improve effective heat exchange area, make radiative transfer more even, reduce lower part boiler tube hydrocarbon partial pressure, reduce specific surface area, reduce the carrying out of thermo-negative reaction, thus alleviate the generation of coking, extend the operational cycle.
Embodiment
As shown in Figure 2, one way boiler tube top is divided into oval boiler tube 1 (circulating face as shown in Figure 4), and bottom is divided into round kiln pipe 3 (circulating face as shown in Figure 3), is connected therebetween by oval to rounded transitional pipe fitting 2 transition.In the present embodiment, radiating furnace tube upper part oval pipe length is 4m, and lower part pipe length is 8m.This radiating furnace tube is vertical hanging, and perpendicular to the center line of radiant heat zone.Radiating furnace tube upper part oval pipe circulation area is 0.1256cm
2, lower part pipe circulation area is 0.1884cm
2.
The utility model increases specific surface area in the upper part of radiating furnace tube, reduces the bridging effect of adjacent boiler tube, improves effective heat exchange area, makes radiative transfer more even; In the lower part of radiating furnace tube, adopt larger circular boiler tube, reduce hydrocarbon partial pressure in the cracking reflection later stage, reduce specific surface area, reduce the carrying out of thermo-negative reaction, thus alleviate the generation of coking, extend the operational cycle.
Technique scheme is a kind of embodiment of the present utility model, for those skilled in the art, on the basis that the utility model discloses principle, be easy to make various types of improvement or distortion, and the structure be not limited only to described by the above-mentioned specific embodiment of the utility model, therefore previously described just preferred, and not there is restrictive meaning.The utility model radiant coil can be used for newly-built pyrolyzer or carries out capacity expansion revamping to pyrolyzer.
Claims (5)
1. an ethane cracking furnace one-way radiating furnace tube, is characterized in that: described ethane cracking furnace one-way radiating furnace tube comprises the oval pipe on top and the pipe of bottom, and described oval pipe and pipe are coaxially set; The lower end of described oval pipe is connected by the upper end of transition fitting with described pipe.
2. ethane cracking furnace one-way radiating furnace tube according to claim 1, is characterized in that: the length of described oval pipe is L1, and the length of described pipe is L2, L1/L2=1/2 ~ 2/3.
3. ethane cracking furnace one-way radiating furnace tube according to claim 1, is characterized in that: the circulation area of described oval pipe is S1, and the circulation area of described pipe is S2, and 0.1256cm
2≤ S1≤0.785cm
2, S1≤S2≤2S1.
4. according to the arbitrary described ethane cracking furnace one-way radiating furnace tube of claims 1 to 3, it is characterized in that: described transition fitting is for oval to rounded transitional pipe fitting, and the cross section of the inner chamber of its epimere is oval, and its size is identical with the inner chamber of described oval pipe; The cross section of the inner chamber of its hypomere is circular, and its size is identical with the inner chamber of described pipe, is the transition section from ellipse to circle between described ellipse to the epimere and hypomere of rounded transitional pipe fitting.
5. ethane cracking furnace one-way radiating furnace tube according to claim 4, is characterized in that: described ethane cracking furnace one-way radiating furnace tube is vertical hanging, and the axes normal of described oval pipe and pipe is in the center line of radiant heat zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420675763.1U CN204198673U (en) | 2014-11-06 | 2014-11-06 | A kind of ethane cracking furnace one-way radiating furnace tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420675763.1U CN204198673U (en) | 2014-11-06 | 2014-11-06 | A kind of ethane cracking furnace one-way radiating furnace tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204198673U true CN204198673U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420675763.1U Active CN204198673U (en) | 2014-11-06 | 2014-11-06 | A kind of ethane cracking furnace one-way radiating furnace tube |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10626014B2 (en) | 2017-07-25 | 2020-04-21 | Praxiar Technology, Inc. | Reactor packing with preferential flow catalyst |
| US11382288B2 (en) | 2019-02-18 | 2022-07-12 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11564364B2 (en) | 2019-02-18 | 2023-01-31 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11778957B2 (en) | 2019-02-18 | 2023-10-10 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11778964B2 (en) * | 2019-02-18 | 2023-10-10 | Lg Electronics Inc. | Apparatus for cultivating plants |
-
2014
- 2014-11-06 CN CN201420675763.1U patent/CN204198673U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10626014B2 (en) | 2017-07-25 | 2020-04-21 | Praxiar Technology, Inc. | Reactor packing with preferential flow catalyst |
| US11130676B2 (en) | 2017-07-25 | 2021-09-28 | Praxair Technology, Inc. | Reactor packing with preferential flow catalyst |
| US11382288B2 (en) | 2019-02-18 | 2022-07-12 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11564364B2 (en) | 2019-02-18 | 2023-01-31 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11778957B2 (en) | 2019-02-18 | 2023-10-10 | Lg Electronics Inc. | Apparatus for cultivating plants |
| US11778964B2 (en) * | 2019-02-18 | 2023-10-10 | Lg Electronics Inc. | Apparatus for cultivating plants |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |