CN103788981A - Ethene cracking furnace of one-way radiant section furnace tube and application in chemical field - Google Patents
Ethene cracking furnace of one-way radiant section furnace tube and application in chemical field Download PDFInfo
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- CN103788981A CN103788981A CN201210424589.9A CN201210424589A CN103788981A CN 103788981 A CN103788981 A CN 103788981A CN 201210424589 A CN201210424589 A CN 201210424589A CN 103788981 A CN103788981 A CN 103788981A
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Abstract
The invention discloses an ethene cracking furnace of a one-way radiant section furnace tube, the ethene cracking furnace comprises a radiant section, the radiant section has a heat exchange tube (10), wherein, a reinforcement heat transfer element is arranged in the heat exchange tube (10), the reinforcement heat transfer element comprises a distortion sheet, and holes are provided on the distortion sheet. The invention also provides an application of the ethene cracking furnace of the one-way radiant section furnace tube in the chemical field. According to the above technical scheme, the reinforcement heat transfer element is arranged on the heat exchange tube of the radiant section of the one-way radiant section furnace tube ethene cracking furnace, good heat transfer effect is realized, the coking rate of the ethene cracking furnace is reduced, cleaning period of the furnace tube is prolonged, the decoking operation is convenient, the integral performance of the ethene cracking furnace is increased, pressure drop in the furnace tube is effectively reduced, the yield of products alkene is increased, and the ethene cracking furnace has good industrial application and prospect.
Description
Technical field
The present invention relates to chemical field, particularly, relate to a kind of ethane cracking furnace of one way radiant coil and the application at petrochemical industry thereof.
Background technology
Petroleum hydrocarbon cracking ethene processed is the process of the strong heat absorption of a high temperature, therefore not only need reaction mass to be heated to higher temperature to cause scission reaction, but also the energy that need to continue to provide enough in reaction process is to reach needed transformation efficiency.
At present, industrial preparing ethylene mainly adopts the method for tubular reactor high-temperature steam thermo-cracking.For the pyrolyzer of producing ethene, the important directions of its exploitation is exactly high temperature, short stop and low hydrocarbon partial pressure, and pyrolyzer is also pursued and maximized always.The maximization of pyrolyzer exists following advantage: the expense of can reducing investment outlay, reduce stove number of units, and be convenient to management etc.Now, due to the raising of engineering level, in the performance history of superhuge pyrolyzer, in order to improve the ability of pyrolyzer in the situation that not increasing burner hearth length, conventionally use single hose pyrolyzer.This kind of boiler tube met at pyrolyzer and has been rapidly heated and back segment reduces the feature of coking sensitivity at leading portion, and meanwhile, because it does not have bend loss, the overall pressure drop of its boiler tube is also relatively little.There is superhuge cracking directive effect of tool in following technical development process of one way boiler tube.
In ethylene production, ethylene production energy consumption 60% left and right is consumed in pyrolyzer, and high temperature energy consumption is large.Because cracking furnace pipe service temperature in ethylene unit is high, in pipe, carry out the scission reaction of hydro carbons, because the secondary reactions such as polymerization and condensation occur the cracking Xu Ao of hydro carbons, therefore inevitably can generate burnt dirt at cracking furnace pipe inwall.Burnt dirt increases boiler tube thermal resistance, and heat transfer coefficient reduces, and wall temperature raises and occurs local superheating phenomenon.In addition, coking also makes cracking process energy consumption raise, and pipeline internal diameter diminishes, and fluid-pressure drop increases.Thereby reduce the operational cycle of pyrolyzer, reduce the work-ing life of cracking furnace pipe, the increase of pressure drop has also reduced the selectivity of ethene, propylene etc.Therefore how to improve cracking furnace pipe heat transfer efficiency, extend pyrolyzer running period, this is industrial very important.
Now a lot of enhancement of heat transfer technology of application are all to study for strengthening transmission of heat by convection, and to improve overall heat transfer coefficient K and the transmission of heat by convection hot strength q of boiler tube tube wall to material in boiler tube, formula is as follows:
Wherein, δ, δ
f, δ
ebe respectively boiler tube thickness of pipe, viscous flow boundary layer thickness and coking boundary layer thickness, λ, λ
f, λ
e, α
tbe respectively the thermal conductivity of boiler tube tube wall, thermal conductivity, the thermal conductivity in coking frictional belt and the thermal conductivity of material in viscous flow frictional belt, T
wand T
tbe respectively temperature of charge in boiler tube pipe surface temperature and pipe.
In recent years, due to increasing the weight of of oil price rise and global energy-saving and emission-reduction task, relevant scientific and technical personnel have strengthened pyrolyzer enhancement of heat transfer and have reduced the research of coking rate, have successively proposed the technology of a series of enhancement of heat transfer and inhibition coking.Relatively more conventional a kind of mode arranges twisted sheet exactly in pipeline at present, thereby make fluid turbulization or the eddy current of flowing through, can improve like this heat transfer efficiency, and fluid well-distributing is mixed, reduce the coking of boiler tube, can also extend the cycle of operation of pyrolyzer.But the technical scheme that increases twisted sheet can make the pressure of pyrolyzer increase, and has influence on the uniformly distributing of flow, thereby causes the critical index such as processing power and olefin yields to decline.
Summary of the invention
The object of this invention is to provide a kind of ethane cracking furnace of one way radiant coil, this ethane cracking furnace makes heat transfer effect better by enhanced heat transfer component.
To achieve these goals, the invention provides a kind of ethane cracking furnace of one way radiant coil, this ethane cracking furnace comprises radiation section, this radiation section has heat transfer tube, wherein, in this heat transfer tube, is provided with enhanced heat transfer component, this enhanced heat transfer component comprises twisted sheet, on this twisted sheet, has hole.
Preferably, in described heat transfer tube, be provided with at least one in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, wherein,
This first enhanced heat transfer component comprises the first twisted sheet, and described the first twisted sheet has the vertical core that runs through formation along the axial direction due of described heat transfer tube from upper side edge to the lower side of described the first twisted sheet;
This second enhanced heat transfer component comprises described the first twisted sheet and the first sleeve pipe being arranged among described the first twisted sheet, and the preglabellar field of this first twisted sheet is connected with the outside surface of described the first sleeve pipe;
The 3rd enhanced heat transfer component comprises the second twisted sheet, and described the second twisted sheet has the cross-drilled hole of the edge closure that runs through the surface of described the second twisted sheet and form;
The 4th enhanced heat transfer component is included in mutual vertically disposed described the first twisted sheet and/or the second twisted sheet on cross section;
The 5th enhanced heat transfer component is included in mutual vertically disposed two described the first twisted sheets and the second sleeve pipe being arranged among these two first twisted sheets on cross section, and in these two first twisted sheets, the preglabellar field of at least one is connected with the outside surface of described the second sleeve pipe.
Preferably, described the first enhanced heat transfer component and/or the second enhanced heat transfer component and/or the 3rd enhanced heat transfer component and/or the 4th enhanced heat transfer component and/or the 5th enhanced heat transfer component are about the medullary ray symmetry of described heat transfer tube.
Preferably, described the first sleeve pipe and/or the second sleeve pipe are cylindrical tube, and the medullary ray of this cylindrical tube and the medullary ray of described heat transfer tube overlap.
Preferably, cook the tangent plane of described the second twisted sheet in described cross-drilled hole center, described cross-drilled hole is projected as circle on this tangent plane.
The number of the described enhanced heat transfer component preferably, arranging in described heat transfer tube is 1-24.
Preferably, the number of described enhanced heat transfer component is 2-10
Preferably, multiple described enhanced heat transfer components are set in described heat transfer tube, the axial distance between adjacent described enhanced heat transfer component is for being more than or equal to 15D and being less than or equal to 75D.
Preferably, the axial distance between adjacent described enhanced heat transfer component is for being more than or equal to 25D and being less than or equal to 50D
Preferably, the diameter of the vertical core of described the first enhanced heat transfer component is for being more than or equal to 0.05D and being less than or equal to 0.95D.
Preferably, the diameter of the vertical core of described the first enhanced heat transfer component is for being more than or equal to 0.8D and being less than or equal to 0.95D.
Preferably, the diameter of the diameter of described the second enhanced heat transfer component vertical core and/or described the first sleeve pipe and/or described the second sleeve pipe is for being more than or equal to 0.05D and being less than or equal to 0.95D.
Preferably, the diameter of the diameter of described the second enhanced heat transfer component vertical core and/or described the first sleeve pipe and/or described the second sleeve pipe is for being more than or equal to 0.8D and being less than or equal to 0.95D.
Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet equals 0.8 and be less than or equal to 0.95 for being more than or equal to 0.05 and be less than or equal to 0.95, being preferably more than.
Preferably, the ratio along between the axial length of described heat transfer tube and the diameter of described heat transfer tube of described enhanced heat transfer component is 1-10.
Preferably, the ratio along between the axial length of described heat transfer tube and the diameter of described heat transfer tube of described enhanced heat transfer component is 1-6.
Preferably, the angle of rotation of described enhanced heat transfer component is 90-1080 °.
Preferably, the angle of rotation of described enhanced heat transfer component is 120-360 °.
Preferably, described enhanced heat transfer component and described heat transfer tube form for casting or weld or forging.
Preferably, described enhanced heat transfer component is identical with the material of the body of heat transfer tube, or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat transfer tube.
Preferably, described enhanced heat transfer component is arranged on the opening for feed 0-0.3m place of the described heat transfer tube of distance in described heat transfer tube.
Preferably, described enhanced heat transfer component is arranged on the opening for feed 0.0.1m place of the described heat transfer tube of distance (10) in described heat transfer tube.
The present invention also provides the application in chemical field according to ethane cracking furnace of the present invention.
Pass through technique scheme, in the heat transfer tube of the radiation section of the ethane cracking furnace of one way radiant coil, arrange according to enhanced heat transfer component of the present invention, not only realize good heat-transfer effect, reduce the coking rate of ethane cracking furnace, extended the cleaning interval of boiler tube, can also be convenient to carry out coke cleaning operation, improve the overall performance of ethane cracking furnace, can also effectively reduce the pressure drop in boiler tube, improve the yield of product alkene, there is good prospects for commercial application.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the sectional view with the heat transfer tube of the first enhanced heat transfer component;
Fig. 2 is the side-view of heat transfer tube as shown in Figure 1, wherein supposes that heat transfer tube is transparent, therefore can see the structural representation of the first enhanced heat transfer component within heat transfer tube;
Fig. 3 is the sectional view with the heat transfer tube of the second enhanced heat transfer component;
Fig. 4 is the side-view of heat transfer tube as shown in Figure 3, wherein supposes that heat transfer tube is transparent, therefore can see the structural representation of the second enhanced heat transfer component within heat transfer tube;
Fig. 5 is the sectional view with the heat transfer tube of the 3rd enhanced heat transfer component;
Fig. 6 is the side-view of heat transfer tube as shown in Figure 5, wherein supposes that heat transfer tube is transparent, therefore can see the structural representation of the 3rd enhanced heat transfer component within heat transfer tube;
Fig. 7 is according to the schematic diagram of the ethane cracking furnace of one way radiant coil of the present invention.
Description of reference numerals
1 first twisted sheet 2 second twisted sheets
3 first sleeve pipe 10 heat transfer tubes
20 high pressure drum 21 convection zones
22 radiation section 23 burners
24 quenching boilers
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that not doing contrary explanation, the noun of locality of use typically refers to heat transfer tube of the present invention and the direction of ethane cracking furnace under working condition, the namely direction shown in accompanying drawing as " upper and lower, left and right ".
The invention provides a kind of ethane cracking furnace of one way radiant coil, this ethane cracking furnace comprises radiation section, and this radiation section has heat transfer tube 10, wherein, in this heat transfer tube 10, be provided with enhanced heat transfer component, this enhanced heat transfer component comprises twisted sheet, on this twisted sheet, has hole.
In ethane cracking furnace, as shown in Figure 7, radiation section 22 is used for raw material to heat.Normally, twisted sheet can be understood as a line segment in horizontal direction around himself mid point rotation, go back in the vertical direction upwards or translation downwards and the track curved surface of process simultaneously, and be provided with in the cross section of part pipeline section of twisted sheet at heat transfer tube 10, the cross section of twisted sheet always is heat transfer tube 10 cross section circular diameter.Twisted sheet comprises a pair of upper side edge being parallel to each other and lower side, and a pair of distortion limit, the equal diameters of this pair of upper side edge and lower side and heat transfer tube 10, and two distortion limits contact with the tube wall of heat transfer tube 10 all the time.
In heat transfer tube 10 arrange comprise that the enhanced heat transfer component of this twisted sheet can utilize the rotation of fluid self, attenuate the frictional belt of fluid, to reach the object of enhancement of heat transfer.In the heat transfer tube 10 of the radiation section of ethane cracking furnace of the present invention, on twisted sheet, there is hole, thereby in improving heat-transfer effect, reduced convection cell and flow through the resistance of heat transfer tube 10, and be convenient to carry out coke cleaning.
In conjunction with formula (1) and (2) above, after installing enhanced heat transfer component additional in the heat transfer tube 10 of the radiation section of ethane cracking furnace of the present invention, fluid liquid form in pipe changes rotating fluid into by piston flow, produce very large tangential velocity, there is to very strong scouring force in frictional belt, the coking amount of attenuate viscous flow frictional belt and minimizing boiler tube.Wherein δ
fand δ
enumerical value reduce, so the value of overall heat transfer coefficient K will increase.
Pass through technique scheme, in the heat transfer tube of the radiation section of the ethane cracking furnace of one way radiant coil, arrange according to enhanced heat transfer component of the present invention, not only realize good heat-transfer effect, reduce the coking rate of ethane cracking furnace, extended the cleaning interval of boiler tube, can also be convenient to carry out coke cleaning operation, improve the overall performance of ethane cracking furnace, can also effectively reduce the pressure drop in boiler tube, improve the yield of product alkene, there is good prospects for commercial application.
Preferably, in described heat transfer tube 10, be provided with at least one in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, wherein,
This first enhanced heat transfer component comprises the first twisted sheet 1, and described the first twisted sheet 1 has the vertical core that runs through formation along the axial direction due of described heat transfer tube 10 from upper side edge to the lower side of described the first twisted sheet 1;
This second enhanced heat transfer component comprises described the first twisted sheet 1 and the first sleeve pipe 3 being arranged among described the first twisted sheet 1, and the preglabellar field of this first twisted sheet 1 is connected with the outside surface of described the first sleeve pipe 3;
The 3rd enhanced heat transfer component comprises the second twisted sheet 2, and described the second twisted sheet 2 has the cross-drilled hole of the edge closure that runs through the surface of described the second twisted sheet 2 and form;
The 4th enhanced heat transfer component is included in mutual vertically disposed described the first twisted sheet 1 and/or the second twisted sheet 2 on cross section;
The 5th enhanced heat transfer component is included on cross section mutually vertically disposed two described the first twisted sheets 1 and is arranged on these two the second sleeve pipes among the first twisted sheet 1, and in these two the first twisted sheets 1, the preglabellar field of at least one is connected with the outside surface of described the second sleeve pipe.
According to the difference of the set-up mode in hole on twisted sheet, the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component are provided in the present invention, respectively these five kinds of enhanced heat transfer components have been introduced below.
The first enhanced heat transfer component comprises the first twisted sheet 1, as depicted in figs. 1 and 2, on this first twisted sheet 1, there is the first vertical core running through from upper side edge to the lower side of the first twisted sheet 1 along the axial direction due of heat transfer tube 10, therefore the therefrom separated part that is divided into two distortions of the first twisted sheet 1, namely be provided with in the cross section of part pipeline section of the first enhanced heat transfer component at heat transfer tube 10, the cross section of the first twisted sheet 1 is two line segments that are connected with circumference on heat transfer tube 10 cross section circular diameter.
For common heat transfer tube, the main thermal resistance of tube fluid heat exchange concentrates on the low regime of laminar sub-layer, but for the heat transfer tube that is provided with the first enhanced heat transfer component of the present invention, the piston flow of tube fluid changes rotating fluid, improve tangential velocity, destroyed original laminar layer, attenuate frictional belt, increase heat transfer coefficient, improved the heat-transfer effect of heat transfer tube.
And, owing to thering is vertical core on the first twisted sheet 1, thereby hydraulic decoking head and scale removal head can be inserted in heat transfer tube, to carry out mechanical decoking and scale removal.
Pass through like this technique scheme, this vertical core can reduce resistance, improve heat transfer coefficient, and can carry out mechanical decoking, so not only strengthen the heat transfer efficiency of ethane cracking furnace, and coking rate and the scaling rate of the radiation section of ethane cracking furnace are reduced, can also under Parking condition, carry out mechanical decoking and scale removal, guarantee the exploitativeness of commercial run.
The second enhanced heat transfer component comprises the first twisted sheet 1 and the first sleeve pipe 3, and as shown in Figure 3 and Figure 4, the outside surface of this first sleeve pipe 3 is connected with the preglabellar field of the first twisted sheet 1 of this second enhanced heat transfer component.That is to say, the first sleeve pipe 3 is set within heat transfer tube 10, between heat transfer tube 10 and the first sleeve pipe 3, be connected with the part twisted sheet separating by vertical core.
This second enhanced heat transfer component is equivalent to the first sleeve pipe 3 is set in the first enhanced heat transfer component, and therefore the principle of its enhance heat transfer efficiency is identical, and also has the effect that reduces coking rate and structure speed.Wherein this first sleeve pipe 3 mainly plays the effect of strengthening framework intensity, prevents heat transfer tube 10 life-time service and damages twisted sheet.
The 3rd enhanced heat transfer component comprises the second twisted sheet 2, is provided with the cross-drilled hole of the edge closure that runs through the surface of the second twisted sheet 2 and form, as shown in Figure 5 and Figure 6 on this second twisted sheet 2.
The perforate direction of the cross-drilled hole on the second twisted sheet 2 of the 3rd enhanced heat transfer component is different from the vertical core in the first twisted sheet 1, this cross-drilled hole can be by the mobile fluid of axial direction due, also can be by the mobile fluid of radial direction, therefore also can change the flow direction of fluid, destroy original laminar flow, to increase heat transfer coefficient, improve the heat-transfer effect of heat transfer tube.And cross-drilled hole on twisted sheet can be in axial direction upper and lower corresponding, so just can connect vertically, thereby be convenient to mechanical decoking and hydraulic decoking operates.
The 4th enhanced heat transfer component is included in mutual vertically disposed two the first twisted sheets 1 on cross section, or two the second twisted sheets 2, or first twisted sheet 1 and second twisted sheet 2.In all cross sections of the part that is provided with the 4th enhanced heat transfer component of heat transfer tube 10, the straight line at two the first twisted sheet 1 section line places is all orthogonal.
It should be noted that, when the 4th enhanced heat transfer component comprises that two on cross section mutually when vertically disposed the first twisted sheet 1, the diameter of the vertical core of these two the first twisted sheets 1 is not necessarily identical, and the position that vertical core arranges is also not necessarily identical.That is to say, two the first twisted sheets 1 in the 4th enhanced heat transfer component are not necessarily identical.
The 5th enhanced heat transfer component is included in mutual vertically disposed two the first twisted sheets 1 and the second sleeve pipe being arranged among described the first twisted sheet 1 on cross section, and in two the first twisted sheets 1, the preglabellar field of at least one is connected with the outside surface of described the second sleeve pipe.
Because the diameter of the vertical core of two the first twisted sheets 1 is not necessarily identical, and the position that vertical core arranges is also not necessarily identical, therefore the diameter of this second sleeve pipe can meet the preglabellar field of at least one in two twisted sheets with position and is connected with the outside surface of described the second sleeve pipe.
It should be noted that, because enhanced heat transfer component in heat transfer tube in the present invention 10 is preferably at least one in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, therefore in heat transfer tube 10, the quantity of enhanced heat transfer component is at least two, and these two enhanced heat transfer components can be any two kinds in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component.When the enhanced heat transfer component in heat transfer tube 10 is during more than two, as long as these enhanced heat transfer components are more than two kinds, and kind to concrete enhanced heat transfer component and putting in order is not all limited, and spacing between enhanced heat transfer component also might not be identical, can arrange arbitrarily as required.
And, adopt vacuum metallurgy investment pattern precision casting to form with the heat transfer tube entirety of above-mentioned enhanced heat transfer component, or adopt two one-tenths of the method processing of forging, or process by the method for welding, meet and in practical application, exchange heat pipe requirement of strength.
Preferably, described the first enhanced heat transfer component and/or the second enhanced heat transfer component and/or the 3rd enhanced heat transfer component and/or the 4th enhanced heat transfer component and/or the 5th enhanced heat transfer component are about the medullary ray symmetry of described heat transfer tube 10.
In this preferred implementation, on the twisted sheet of one or more in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, form the medullary ray symmetry of hole remainder afterwards about heat transfer tube 10.That is to say, for the first twisted sheet 1 and the second twisted sheet 2, forming vertical core and cross-drilled hole remainder is afterwards separated from each other and symmetry, for the second enhanced heat transfer component and the 5th enhanced heat transfer component, it is together telescopic joint by the first sleeve pipe 3 or the second that this twisted sheet forms corresponding hole remainder afterwards, wherein, on the medullary ray of the center of vertical core in heat transfer tube 10, and vertical core is also about medullary ray symmetry.It is even that structure symmetrically like this can make each enhanced heat transfer component in heat transfer tube 10 be subject to the reactive force of fluid.
Preferably, described the first sleeve pipe 3 and/or the second sleeve pipe are cylindrical tube, and the medullary ray of this cylindrical tube overlaps with the medullary ray of described heat transfer tube 10.
More preferably, for the second enhanced heat transfer component and the 5th enhanced heat transfer component, the first sleeve pipe 3 and/or the second sleeve pipe are preferably cylindrical tube, that is to say that vertical core is circle on the vertical view of heat transfer tube 10.
Preferably, cook the tangent plane of described the second twisted sheet 2 in described cross-drilled hole center, described cross-drilled hole is projected as circle on this tangent plane.
For the cross-drilled hole on the 3rd enhanced heat transfer component, because the second twisted sheet 2 is curved surfaces, therefore the edge of cross-drilled hole is not in one plane.In a preferred embodiment, cook the tangent plane of twisted sheet in the center of cross-drilled hole, cross-drilled hole is projected as circle on tangent plane.
Preferably, the number that enhanced heat transfer component is set in described heat transfer tube 10 is 1-24.More preferably, the number of described enhanced heat transfer component is 2-10.Preferably, multiple described enhanced heat transfer components are set in described heat transfer tube 10, the axial distance between adjacent described enhanced heat transfer component is for being more than or equal to 15D and being less than or equal to 75D.More preferably, the axial distance between adjacent described enhanced heat transfer component is for being more than or equal to 25D and being less than or equal to 50D.
Enhanced heat transfer component can arrange in the whole length of heat transfer tube 10, also can subsection setup on heat transfer tube 10, and this enhanced heat transfer component also can select evenly to arrange or inhomogeneous setting as required, the present invention is not limited this.Between adjacent enhanced heat transfer component, axial distance is for being more than or equal to 15D and being less than or equal to 75D.More preferably, the axial distance between adjacent described enhanced heat transfer component is for being more than or equal to 25D and being less than or equal to 50D.。Piecewise constantly becomes rotating fluid by the fluid in pipe from piston flow like this, improves heat transfer efficiency.This preferred implementation is the general range arranging according to the length of heat transfer tube 10, and the present invention is to this and be not construed as limiting, and the number of the enhanced heat transfer component that any and length heat transfer tube 10 adapt and axial spacing are all within protection scope of the present invention.
And, it should be noted that, because enhanced heat transfer component in heat transfer tube in the present invention 10 is preferably at least one in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, therefore in heat transfer tube 10, the quantity of enhanced heat transfer component is at least two, and these two enhanced heat transfer components can be any two kinds in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component.When the enhanced heat transfer component in heat transfer tube 10 is during more than two, as long as these enhanced heat transfer components are more than two kinds, and kind to concrete enhanced heat transfer component and putting in order is not all limited, and spacing between enhanced heat transfer component also might not be identical, can arrange arbitrarily as required.
Preferably, the diameter of the vertical core of described the first enhanced heat transfer component is for being more than or equal to 0.05D and being less than or equal to 0.95D.More preferably, the diameter of the vertical core of described the first enhanced heat transfer component is for being more than or equal to 0.8D and being less than or equal to 0.95D.Preferably, the diameter of the diameter of the vertical core of described the second enhanced heat transfer component and/or described the first sleeve pipe 3 and/or described the second sleeve pipe is for being more than or equal to 0.05D and being less than or equal to 0.95D.More preferably, the diameter of the diameter of described the second enhanced heat transfer component vertical core and/or described the first sleeve pipe 3 and/or described the second sleeve pipe is for being more than or equal to 0.8D and being less than or equal to 0.95D.。Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet equals 0.8 and be less than or equal to 0.95 for being more than or equal to 0.05 and be less than or equal to 0.95, being preferably more than.
In this preferred implementation, provide the diameter preferred value scope of vertical core, the first sleeve pipe 3, the second sleeve pipe and the cross-drilled hole of vertical core, second enhanced heat transfer component of the first enhanced heat transfer component.The numerical range of above-mentioned diameter is to arrange according to general experience.Owing to will carrying out mechanical decoking and scale removal, therefore the minimum value of the diameter in this hole should be as the criterion can make coke cleaning head and scale removal head stretch into heat transfer tube 10.For example, the diameter of existing minimum coke cleaning head is as 5mm, and corresponding bore dia is 5mm.
Preferably, the ratio between the axial length along described heat transfer tube 10 of described enhanced heat transfer component and the diameter of described heat transfer tube 10 is 1-10, is preferably 1-6.Preferably, the angle of rotation of described enhanced heat transfer component is 90-1080 °, is preferably 120-360 °.
Conventionally, the axial length that twisted sheet distortion is 180 ° is distortion ratio with edge with the ratio of diameter, this distortion is than the length that has determined each enhanced heat transfer component, and the angle of rotation of enhanced heat transfer component has determined the degreeof tortuosity of enhanced heat transfer component, thereby affects heat transfer efficiency.The distortion ratio of enhanced heat transfer component can be adjusted according to practical situation, and the above preferable range under normal circumstances that only provided, does not limit protection scope of the present invention.The rotation angle of described enhanced heat transfer component has impact to the degree of tube fluid rotating fluid, and under the prerequisite of identical distortion ratio, angle of rotation is larger, and the tangential velocity of fluid is just larger.But the present invention is not limited to the value of above-mentioned angle of rotation, any applicable rotation angle value can be with in the present invention.
Preferably, described enhanced heat transfer component and described heat transfer tube 10 form for casting or weld or forging.That is to say, in the preferred embodiment of the present invention, this enhanced heat transfer component and heat transfer tube 10 can be integrated and form, and also can interconnect, and the present invention are integrally formed with heat transfer tube 10 enhanced heat transfer component or the method that is connected is not limited.
Preferably, described enhanced heat transfer component is identical with the material of the body of heat transfer tube 10, or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat transfer tube 10.The present invention is not limited the material of enhanced heat transfer component and heat transfer tube 10, but in this preferred implementation, the thermal conductivity of the material that enhanced heat transfer component uses is better or identical than the material of the body of heat transfer tube 10.
Preferably, described enhanced heat transfer component is arranged on the opening for feed 0-0.3m place of the described heat transfer tube 10 of distance in described heat transfer tube 10.More preferably, described enhanced heat transfer component is arranged on the opening for feed 0.0.1m place of the described heat transfer tube 10 of distance in described heat transfer tube 10.
In ethane cracking furnace, in heat transfer tube 10, be provided with enhanced heat transfer component, raw material enters in heat transfer tube 10 from the opening for feed of heat transfer tube 10, and this enhanced heat transfer component is preferably arranged on the place apart from this opening for feed 0-0.3m, is more preferably arranged on the place apart from opening for feed 0-0.1m.
The present invention also provides the application in chemical field according to ethane cracking furnace of the present invention.Illustrate below.
Describe as example take an ethane cracking furnace of producing 100000 tons per year.According to the preferred embodiment of the present invention, this ethane cracking furnace is improved.Under identical processing condition, utilize according to the ethane cracking furnace of prior art (twisted sheet is not set in the heat transfer tube of radiation section) and carry out contrast experiment according to ethane cracking furnace of the present invention, the process data contrast of experimental result is as shown in table 1, as seen from Table 1, utilized according to radiation section exit pressure drop after vinylbenzene process furnace of the present invention and reduced, the pressure drop of radiant coil reduces.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (16)
1. an ethane cracking furnace for one way radiant coil, this ethane cracking furnace comprises radiation section, this radiation section has heat transfer tube (10), it is characterized in that, this heat transfer tube is provided with enhanced heat transfer component in (10), and this enhanced heat transfer component comprises twisted sheet, on this twisted sheet, has hole.
2. ethane cracking furnace according to claim 1, it is characterized in that, in described heat transfer tube (10), be provided with at least one in the first enhanced heat transfer component, the second enhanced heat transfer component, the 3rd enhanced heat transfer component, the 4th enhanced heat transfer component and the 5th enhanced heat transfer component, wherein
This first enhanced heat transfer component comprises the first twisted sheet (1), and described the first twisted sheet (1) has the vertical core that runs through formation along the axial direction due of described heat transfer tube (10) from upper side edge to the lower side of described the first twisted sheet (1);
This second enhanced heat transfer component comprises described the first twisted sheet (1) and is arranged on the first sleeve pipe (3) among described the first twisted sheet (1), and the preglabellar field of this first twisted sheet (1) is connected with the outside surface of described the first sleeve pipe (3);
The 3rd enhanced heat transfer component comprises the second twisted sheet (2), and described the second twisted sheet (2) has the cross-drilled hole of the edge closure that runs through the surface of described the second twisted sheet (2) and form;
The 4th enhanced heat transfer component is included in mutual vertically disposed described the first twisted sheet (1) and/or the second twisted sheet (2) on cross section;
The 5th enhanced heat transfer component is included on cross section vertically disposed two described the first twisted sheets (1) mutually and is arranged on the second sleeve pipe among these two first twisted sheets (1), and in these two first twisted sheets (1), the preglabellar field of at least one is connected with the outside surface of described the second sleeve pipe.
3. ethane cracking furnace according to claim 2, it is characterized in that, described the first enhanced heat transfer component and/or the second enhanced heat transfer component and/or the 3rd enhanced heat transfer component and/or the 4th enhanced heat transfer component and/or the 5th enhanced heat transfer component are about the medullary ray symmetry of described heat transfer tube (10).
4. ethane cracking furnace according to claim 3, is characterized in that, described the first sleeve pipe (3) and/or the second sleeve pipe are cylindrical tube, and the medullary ray of this cylindrical tube overlaps with the medullary ray of described heat transfer tube (10).
5. according to the ethane cracking furnace described in claim 2 or 3, it is characterized in that, cook the tangent plane of described the second twisted sheet (2) in described cross-drilled hole center, described cross-drilled hole is projected as circle on this tangent plane.
6. according to the ethane cracking furnace described in any one in claim 1-3, it is characterized in that, the number of the described enhanced heat transfer component arranging in described heat transfer tube (10) is 1-24, is preferably 2-10.
7. ethane cracking furnace according to claim 6, it is characterized in that, multiple described enhanced heat transfer components are set in described heat transfer tube (10), and the axial distance between adjacent described enhanced heat transfer component equals 25D and is less than or equal to 50D for being more than or equal to 15D and being less than or equal to 75D, being preferably more than.
8. ethane cracking furnace according to claim 3, is characterized in that, the diameter of the vertical core of described the first enhanced heat transfer component equals 0.8D and is less than or equal to 0.95D for being more than or equal to 0.05D and being less than or equal to 0.95D, being preferably more than.
9. ethane cracking furnace according to claim 4, it is characterized in that, the diameter of the diameter of described the second enhanced heat transfer component vertical core and/or described the first sleeve pipe (3) and/or described the second sleeve pipe equals 0.8D and is less than or equal to 0.95D for being more than or equal to 0.05D and being less than or equal to 0.95D, being preferably more than.
10. ethane cracking furnace according to claim 5, is characterized in that, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet equals 0.8 and be less than or equal to 0.95 for being more than or equal to 0.05 and be less than or equal to 0.95, being preferably more than.
11. ethane cracking furnaces according to claim 2, is characterized in that, the ratio between the axial length along described heat transfer tube (10) of described enhanced heat transfer component and the diameter of described heat transfer tube (10) is 1-10, is preferably 1-6.
12. ethane cracking furnaces according to claim 2, is characterized in that, the angle of rotation of described enhanced heat transfer component is 90-1080 °, is preferably 120-360 °.
13. ethane cracking furnaces according to claim 1 and 2, is characterized in that, described enhanced heat transfer component and described heat transfer tube (10) form for casting or weld or forging.
14. ethane cracking furnaces according to claim 1 and 2, it is characterized in that, described enhanced heat transfer component is identical with the material of the body of heat transfer tube (10), or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat transfer tube (10).
15. ethane cracking furnaces according to claim 1, is characterized in that, described enhanced heat transfer component is arranged on the opening for feed 0-0.3m place of the described heat transfer tube of distance (10) in described heat transfer tube (10), is preferably 0.01m place.
16. application in chemical field according to the ethane cracking furnace described in claim 1-15.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210424589.9A CN103788981B (en) | 2012-10-30 | 2012-10-30 | The ethane cracking furnace of one way radiant coil and its application in chemical field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210424589.9A CN103788981B (en) | 2012-10-30 | 2012-10-30 | The ethane cracking furnace of one way radiant coil and its application in chemical field |
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| CN103788981A true CN103788981A (en) | 2014-05-14 |
| CN103788981B CN103788981B (en) | 2018-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112745885A (en) * | 2019-10-29 | 2021-05-04 | 中国石油化工股份有限公司 | Heat-conducting furnace tube for two-pass radiation section ethylene cracking furnace and preparation method and application thereof |
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| CN112745885A (en) * | 2019-10-29 | 2021-05-04 | 中国石油化工股份有限公司 | Heat-conducting furnace tube for two-pass radiation section ethylene cracking furnace and preparation method and application thereof |
| CN112745885B (en) * | 2019-10-29 | 2022-08-19 | 中国石油化工股份有限公司 | Heat-conducting furnace tube for two-pass radiation section ethylene cracking furnace and preparation method and application thereof |
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| CN103788981B (en) | 2018-12-04 |
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