CN103791483A - Styrene heating furnace and application thereof in field of chemical industry - Google Patents
Styrene heating furnace and application thereof in field of chemical industry Download PDFInfo
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- CN103791483A CN103791483A CN201210424587.XA CN201210424587A CN103791483A CN 103791483 A CN103791483 A CN 103791483A CN 201210424587 A CN201210424587 A CN 201210424587A CN 103791483 A CN103791483 A CN 103791483A
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Abstract
The invention discloses a styrene heating furnace. The styrene heating furnace comprises a radiating section, wherein the radiating section is provided with a heat exchange tube (10), a strengthened heat transfer element is arranged in the heat exchange tube (10), and the strengthened heat transfer element comprises a twisting piece in which holes are formed. The invention further provides an application of the styrene heating furnace in the field of a chemical industry. By adopting the technical scheme, the strengthened heat transfer element is arranged in the heat exchange tube on the radiating section of the styrene heating furnace, so that the flow form of liquid in the heat exchange tube can be changed, the severe degree of turbulence flow can be intensified, the primary boundary layer of heat transfer can be thinned, the heat transfer performance of the styrene heating furnace can be improved, and the integral performance of the styrene heating furnace can be improved.
Description
Technical field
The present invention relates to chemical field, particularly, relate to a kind of styrene heating furnace and the application at chemical field thereof.
Background technology
Styrene is a kind of important basic organic chemical industry raw material, is the derivative of benzene consumption maximum.At present, produce styrene and mainly adopt ethylbenzene vapor catalytic dehydrogenation technique, take ethylbenzene as raw material, add superheated steam, under the effect of the catalyst such as oxidation siderochrome or zinc oxide, adopt adiabatic reactor (industrial application is more) or tubular type isothermal bed bioreactor to carry out dehydrogenation reaction and make styrene.
Production of styrene needs a large amount of overheated steams, and these steam provide by heating furnace.Styrene heating furnace radiant section adopts vertical arrangement conventionally, is provided with base burning device, conventionally by boiler tube is installed additional to strengthening and heat transferring device, not only can raise the efficiency, and can save fuel.
Now a lot of augmentation of heat transfer technology of application are all to study for strengthening convection heat transfer' heat-transfer by convection, and to improve overall heat-transfer coefficient K and the convection heat transfer' heat-transfer by convection calorific intensity q of boiler tube tube wall to material in boiler tube, formula is as follows:
Wherein, δ, δ
f, δ
ebe respectively boiler tube pipe thickness, viscous flow boundary layer thickness and coking boundary layer thickness, λ, λ
f, λ
e, α
tbe respectively the thermal conductivity factor of boiler tube tube wall, thermal conductivity factor, the thermal conductivity factor in coking boundary layer and the thermal conductivity factor of material in viscous flow boundary layer, T
wand T
tbe respectively temperature of charge in boiler tube tube wall temperature and pipe.
At present, the strengthening and heat transferring device of tubular type is mainly by the shape of heat-transfer area or in pipe, adds member to increase fluid turbulent degree and expansion heat transfer area, to improve heat transfer efficiency, to save energy.More conventional tubular type strengthening and heat transferring device is provided with fin in inside, this internally finned tube is to process by special welding procedure and equipment, the heat transfer process of fluid in pipe is unidirectional forced-convection heat transfer, and the welding of fin and processing are of great impact for what conduct heat; Another is in pipe, to insert plug-in unit, and the heat transfer unit (HTU) of this structure is conventionally under the operating mode of low reynolds number or high viscosity fluid heat transfer, and the plug-in unit in pipe can play good effect for the heat transfer of strengthening gas, low reynolds number fluid or high viscosity fluid; Also having one is shaped telescopic tube, this shaped telescopic tube is to be made up of the more piece converging transition and the divergent segment that replace successively, and shaped telescopic tube, by the convergent-divergent of tube wall, makes the variation of fluid pressure generating period produce violent whirlpool wash fluid boundary layer, with attenuate boundary layer, increase heat transfer coefficient.
Although the kind of tubular type strengthening and heat transferring device is a lot, to apply also very extensively, existing these device processing and manufacturing difficulty are larger, and expense cost is high, and long-term operation is also a bottleneck.
Summary of the invention
The object of this invention is to provide a kind of styrene heating furnace, this styrene heating furnace makes heat transfer effect better by enhanced heat transfer component.
To achieve these goals, the invention provides a kind of styrene heating furnace, this styrene heating furnace comprises radiant section, this radiant section has heat exchanger tube, wherein, in this heat exchanger 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 exchanger 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 of described heat exchanger 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 inward flange of this first twisted sheet is connected with the outer 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 inward flange of at least one is connected with the outer 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 center line symmetry of described heat exchanger tube.
Preferably, described the first sleeve pipe and/or the second sleeve pipe are cylindrical tube, and the center line of this cylindrical tube and the center line of described heat exchanger 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 exchanger 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 exchanger 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 0.05D and being less than or equal to 0.8D.
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 0.05D and being less than or equal to 0.8D.
Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet equals 0.05 and be less than or equal to 0.8 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 exchanger tube and the diameter of described heat exchanger tube of described enhanced heat transfer component is 1-10.
Preferably, the ratio along between the axial length of described heat exchanger tube and the diameter of described heat exchanger tube of described enhanced heat transfer component is 1-6.
Preferably, the anglec of rotation of described enhanced heat transfer component is 90-1080 °.
Preferably, the anglec of rotation of described enhanced heat transfer component is 120-360 °.
Preferably, described enhanced heat transfer component and described heat exchanger tube form for casting or weld or forging.
Preferably, described enhanced heat transfer component is identical with the material of the body of heat exchanger tube, or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat exchanger tube.
The present invention also provides the application in chemical field according to styrene heating furnace of the present invention.
Pass through technique scheme, in the heat exchanger tube of the radiant section of styrene heating furnace, arrange according to enhanced heat transfer component of the present invention, change the fluid nowed forming in heat exchanger tube, aggravate the severe degree of turbulent flow, attenuate conduct heat original boundary layer, the heat transfer property of styrene heating furnace is improved.Meanwhile, improve the overall performance of styrene heating furnace.
Other features and advantages of the present invention are described in detail the specific 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 description, is used from explanation the present invention, but is not construed as limiting the invention with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is the sectional view with the heat exchanger tube of the first enhanced heat transfer component;
Fig. 2 is the side view of heat exchanger tube as shown in Figure 1, wherein supposes that heat exchanger tube is transparent, therefore can see the structural representation of the first enhanced heat transfer component within heat exchanger tube;
Fig. 3 is the sectional view with the heat exchanger tube of the second enhanced heat transfer component;
Fig. 4 is the side view of heat exchanger tube as shown in Figure 3, wherein supposes that heat exchanger tube is transparent, therefore can see the structural representation of the second enhanced heat transfer component within heat exchanger tube;
Fig. 5 is the sectional view with the heat exchanger tube of the 3rd enhanced heat transfer component;
Fig. 6 is the side view of heat exchanger tube as shown in Figure 5, wherein supposes that heat exchanger tube is transparent, therefore can see the structural representation of the 3rd enhanced heat transfer component within heat exchanger tube;
Fig. 7 is according to the schematic diagram of of the present invention ethene heating furnace.
Description of reference numerals
1 first twisted sheet 2 second twisted sheets
3 first sleeve pipe 10 heat exchanger tubes
20 chimney 21 convection sections
22 radiant section 23 burners
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific 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 exchanger tube of the present invention and the direction of styrene heating furnace under working condition, the namely direction shown in accompanying drawing as " upper and lower, left and right ".
The invention provides a kind of styrene heating furnace, this styrene heating furnace comprises radiant section, and this radiant section has heat exchanger tube 10, wherein, in this heat exchanger tube 10, is provided with enhanced heat transfer component, and this enhanced heat transfer component comprises twisted sheet, on this twisted sheet, has hole.
In styrene heating furnace, as shown in Figure 7, radiant 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 exchanger tube 10, the cross section of twisted sheet always is heat exchanger tube 10 cross section diameter of a circles.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 exchanger tube 10, and two distortion limits contact with the tube wall of heat exchanger tube 10 all the time.
In heat exchanger tube 10 arrange comprise that the enhanced heat transfer component of this twisted sheet can utilize the rotation of fluid self, attenuate the boundary layer of fluid, to reach the object of augmentation of heat transfer.In the heat exchanger tube 10 of the radiant section of styrene heating 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 exchanger 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 exchanger tube 10 of the radiant section of styrene heating furnace of the present invention, fluid liquid form in pipe changes rotating flow into by piston flow, produce very large tangential velocity, there is to very strong scouring force in boundary layer, the coking amount of attenuate viscous flow boundary layer 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 exchanger tube of the radiant section of styrene heating furnace, arrange according to enhanced heat transfer component of the present invention, change the fluid nowed forming in heat exchanger tube, aggravate the severe degree of turbulent flow, attenuate conduct heat original boundary layer, the heat transfer property of styrene heating furnace is improved.Meanwhile, be also reduced in the speed that forms dirt on tube wall, extend the cleaning frequency of boiler tube, can also be convenient to carry out coke cleaning operation, improve the overall performance of styrene heating furnace.
Preferably, in described heat exchanger 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 of described heat exchanger 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 inward flange of this first twisted sheet 1 is connected with the outer 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 inward flange of at least one is connected with the outer 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 of heat exchanger 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 exchanger tube 10, the cross section of the first twisted sheet 1 is two line segments that are connected with circumference on heat exchanger tube 10 cross section diameter of a circles.
For common heat exchanger tube, the main thermal resistance of tube fluid heat exchange concentrates on the low regime of laminar sublayer, but for the heat exchanger tube that is provided with the first enhanced heat transfer component of the present invention, the piston flow of tube fluid changes rotating flow, improve tangential velocity, destroyed original laminar flow layer, attenuate boundary layer, increase heat transfer coefficient, improved the heat-transfer effect of heat exchanger 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 exchanger 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 styrene heating furnace, and coking rate and the scaling rate of the radiant section of styrene heating furnace are reduced, can also under Parking condition, carry out mechanical decoking and scale removal, guarantee the exploitativeness of industrial process.
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 outer surface of this first sleeve pipe 3 is connected with the inward flange 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 exchanger tube 10, between heat exchanger 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 arrange the first sleeve pipe 3 in the first enhanced heat transfer component, and therefore its principle that strengthens 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 exchanger tube 10 long-term uses and damage 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, 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 exchanger 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 exchanger 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 inward flange of at least one is connected with the outer 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 inward flange of at least one in two twisted sheets with position and is connected with the outer surface of described the second sleeve pipe.
It should be noted that, because enhanced heat transfer component in heat exchanger 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 exchanger 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 exchanger 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 exchanger 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 center line symmetry of described heat exchanger tube 10.
In this preferred embodiment, 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 center line symmetry of hole remainder afterwards about heat exchanger 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, the remainder that this twisted sheet forms after corresponding hole links together by the first sleeve pipe 3 or the second sleeve pipe, wherein, on the center line of the center of vertical core in heat exchanger tube 10, and vertical core is also about center line symmetry.It is even that structure symmetrically like this can make each enhanced heat transfer component in heat exchanger tube 10 be subject to the active force of fluid.
Preferably, described the first sleeve pipe 3 and/or the second sleeve pipe are cylindrical tube, and the center line of this cylindrical tube overlaps with the center line of described heat exchanger 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 top view of heat exchanger 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 exchanger 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 exchanger 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 exchanger tube 10, also can subsection setup on heat exchanger 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 flow by the fluid in pipe from piston flow like this, improves heat transfer efficiency.This preferred embodiment is the general range arranging according to the length of heat exchanger 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 exchanger 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 exchanger 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 exchanger 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 exchanger 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 0.05D and being less than or equal to 0.8D.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 0.05D and being less than or equal to 0.8D.Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet equals 0.05 and be less than or equal to 0.8 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 embodiment, 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 number 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 of a value of the diameter in this hole should be as the criterion can make coke cleaning head and scale removal head stretch into heat exchanger 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 exchanger tube 10 of described enhanced heat transfer component and the diameter of described heat exchanger tube 10 is 1-10, is preferably 1-6.Preferably, the anglec 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 anglec 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 actual conditions, and the above preferable range under normal circumstances that only provided, does not limit protection scope of the present invention.The anglec of rotation of described enhanced heat transfer component has impact to the degree of tube fluid rotating flow, and under the prerequisite of identical distortion ratio, the anglec of rotation is larger, and the tangential velocity of fluid is just larger.But the present invention is not limited to the value of the above-mentioned anglec of rotation, any applicable rotation angle value can be with in the present invention.
Preferably, described enhanced heat transfer component and described heat exchanger 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 exchanger tube 10 can be integrated and form, and also can interconnect, and the present invention are integrally formed with heat exchanger 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 exchanger tube 10, or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat exchanger tube 10.The present invention is not limited the material of enhanced heat transfer component and heat exchanger tube 10, but in this preferred embodiment, the thermal conductivity of the material that enhanced heat transfer component uses is better or identical than the material of the body of heat exchanger tube 10.
The present invention also provides the application in chemical field according to styrene heating furnace of the present invention.Illustrate below.
Take the styrene heating furnaces of 8.5 ten thousand tons/year as example, the radiant section of this styrene heating furnace comprises A section and B section, and this A section is identical with the function of B section, but the position difference in styrene heating furnace; Structure is basic identical, slightly different in size.According to the preferred embodiment of the present invention, this styrene heating furnace is improved.Under identical process conditions, utilize and carry out contrast experiment according to the styrene heating furnace of prior art (twisted sheet is not set in the heat exchanger tube of radiant section) and styrene heating furnace according to the present invention, the process data contrast of experimental result is as shown in table 1, as seen from Table 1, utilized according to outlet temperature after styrene heating furnace of the present invention and improved.
Table 1 contrast experiment's data
Still adopt equipment used in embodiment 1 to test, this time do not change the entrance and exit temperature of boiler tube, contrast is according to the styrene heating furnace of prior art (twisted sheet is not set in the heat exchanger tube of radiant section) with according to the experimental result of styrene heating furnace of the present invention, process data is as shown in table 2, as seen from Table 2, utilized according to the treating capacity of styrene heating furnace of the present invention and improved.
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 the above-mentioned specific 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 combinations.
In addition, between various embodiment of the present invention, also can be combined, 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 (15)
1. a styrene heating furnace, this styrene heating furnace comprises radiant section, and this radiant section has heat exchanger tube (10), it is characterized in that, and this heat exchanger 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. styrene heating furnace according to claim 1, it is characterized in that, in described heat exchanger 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 of described heat exchanger 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 inward flange of this first twisted sheet (1) is connected with the outer 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 inward flange of at least one is connected with the outer surface of described the second sleeve pipe.
3. styrene heating 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 center line symmetry of described heat exchanger tube (10).
4. styrene heating 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 center line of this cylindrical tube overlaps with the center line of described heat exchanger tube (10).
5. according to the styrene heating 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 styrene heating 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 exchanger tube (10) is 1-24, is preferably 2-10.
7. styrene heating furnace according to claim 6, it is characterized in that, multiple described enhanced heat transfer components are set in described heat exchanger tube (10), 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. styrene heating furnace according to claim 3, is characterized in that, the diameter of the vertical core of described the first enhanced heat transfer component equals 0.05D and is less than or equal to 0.8D for being more than or equal to 0.05D and being less than or equal to 0.95D, being preferably more than.
9. styrene heating 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 0.05D and is less than or equal to 0.8D for being more than or equal to 0.05D and being less than or equal to 0.95D, being preferably more than.
10. styrene heating 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 0.05 and be less than or equal to 0.8 for being more than or equal to 0.05 and be less than or equal to 0.95, being preferably more than.
11. styrene heating furnaces according to claim 2, is characterized in that, the ratio between the axial length along described heat exchanger tube (10) of described enhanced heat transfer component and the diameter of described heat exchanger tube (10) is 1-10, is preferably 1-6.
12. styrene heating furnaces according to claim 2, is characterized in that, the anglec of rotation of described enhanced heat transfer component is 90-1080 °, is preferably 120-360 °.
13. styrene heating furnaces according to claim 1 and 2, is characterized in that, described enhanced heat transfer component and described heat exchanger tube (10) form for casting or weld or forging.
14. styrene heating 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 exchanger tube (10), or the material of described enhanced heat transfer component is better than the material thermal conductivity of the body of described heat exchanger tube (10).
15. application in chemical field according to the styrene heating furnace described in claim 1-14.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210424587.XA CN103791483B (en) | 2012-10-30 | 2012-10-30 | Styrene heating furnace and application thereof in chemical field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210424587.XA CN103791483B (en) | 2012-10-30 | 2012-10-30 | Styrene heating furnace and application thereof in chemical field |
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| CN103791483A true CN103791483A (en) | 2014-05-14 |
| CN103791483B CN103791483B (en) | 2020-02-18 |
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Cited By (1)
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| CN109724448A (en) * | 2017-10-27 | 2019-05-07 | 中国石油化工股份有限公司 | Augmentation of heat transfer pipe, pyrolysis furnace and Atmospheric vacuum heating furnace |
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|---|---|
| CN103791483B (en) | 2020-02-18 |
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