CN103791761A - Quenching boiler and application thereof - Google Patents
Quenching boiler and application thereof Download PDFInfo
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- CN103791761A CN103791761A CN201210426135.5A CN201210426135A CN103791761A CN 103791761 A CN103791761 A CN 103791761A CN 201210426135 A CN201210426135 A CN 201210426135A CN 103791761 A CN103791761 A CN 103791761A
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Abstract
The invention provides a quenching boiler. The quenching boiler comprises heat exchange tubes (10), the diameters of which are D. Heat transfer enhancing element comprising warped sheets are arranged in the heat exchange tubes (10), and holes are formed in the warped sheets. The invention further provides an application of the quenching boiler in the chemical engineering field. By means of the quenching boiler, the warped sheets with holes are added in the heat exchange tubes (10), so that the heat exchange tube diameter of the quenching boiler is reduced, the heat transfer performance of the quenching boiler is improved, losses of thermal energy are reduced, the coking rate of the quenching boiler is reduced, and online coking and mechanical decoking can be performed.
Description
Technical field
The present invention relates to chemical field, particularly, relate to a kind of comprising and be provided with the application at chemical field of the quenching boiler of enhanced heat transfer component and described quenching boiler.
Background technology
In ethane cracking furnace, cracking stock, after pyrolysis furnace radiant section Pintsch process, produces a series of basic chemical raw materials such as ethene, propylene, butadiene, benzene and toluene.Pintsch process gas must cool down at short notice, otherwise can be because secondary response reduces the yield of the primary products such as ethene greatly.Therefore, in order to prevent the generation of secondary response, to be 700-950 ℃ of left and right cracking gas carry out heat exchange when cooling by dividing wall type heat exchanger in import, and (generally in 0.1s) is cooled to 300-400 ℃ of left and right in a short period of time; Reclaim the high steam of the 12MPa left and right producing in quenching process simultaneously.
At present, the heat transmission equipment that cracking gas adopts is generally quenching boiler, and described quenching boiler generally includes housing and is arranged on the heat exchanger tube in housing, and its heat exchange position should be tube side and shell side relatively.As shown in Figure 1, the heat exchange principle of quenching boiler is: Pintsch process gas is from the cracking gas entrance 1 of quenching boiler ' enter the tube side of heat exchanger tube 10, low-temperature cooling media (being generally water) is through the water inlet 2 of housing ' enter in shell side, by carrying out heat exchange between partition, Pintsch process gas is cooling gradually, cooled cracking gas is through the cracking gas outlet 3 ' outflow of quenching boiler, and cooling medium is through the steam outlet 4 ' outflow of housing.Quenching boiler and common heat exchanger have a great difference: velocity in pipes is high, and heat transfer intensity is quite high, and operating condition is very strict, and high temperature and high pressure condition need to be born in the both sides of heat exchanger tube simultaneously.
Because cracking stock is the product of oil product, therefore under high temperature heat transfer boundary condition, unavoidably can produce the phenomenon of coking.The reason that produces coking mainly contains two aspects: being the coking of high temperature gas phase on the one hand, is condensate coking on the other hand.The coking of so-called high temperature gas phase refers to because the Pintsch gas mixture temperature of entrance is very high, and portion gas has the stop of long period near heat exchange tube wall, and further polycondensation reaction occurs unsaturated hydrocarbons, thereby impels the generation of coke; So-called condensation coking refers to that in pyrolysis product, high boiling component is in wall condensation, and the one-step polycondensation of going forward side by side, dehydrogenation form burnt dirt.
At present, the structure of quenching boiler mainly develops towards both direction: one is Large Diameter Pipeline Linear shape cooling boiler, its have be evenly distributed, resistance drop is little, to advantages such as insensitive, the large lump coke grain of coking are easy to pass through, take up an area the deficiencies such as many, treating capacity is limited but also exist high, the space of investment; Another is pipe with small pipe diameter quenching boiler, it has that heat exchange area is little, investment is relatively less, space availability ratio is high, treating capacity is unrestricted, distribution of gas is even, the advantage such as cooling fast, but also exist coking sensitivity, bulk coking particle is easy to stop up, need carry out the deficiencies such as hydraulic decoking.At present, high heat transfer coefficient, low coking rate are the targets that cracking technology is pursued with quenching boiler always.
Due to oil price rise and the increase of global energy-saving and emission-reduction task, relevant scientific and technical personnel have strengthened pyrolysis furnace quenching boiler augmentation of heat transfer and have reduced the research of coking rate in recent years.The technology that has successively proposed a series of augmentation of heat transfers and inhibition coking, for example CN 101893396 A disclose the quenching boiler of a kind of twisted slice tube using built-in twisted sheet as enhanced heat transfer component.Research shows, although the augmentation of heat transfer effect of described twisted slice tube is better, it cannot carry out mechanical decoking to the heat exchanger tube that is provided with described enhanced heat transfer component.But, in existing quenching boiler, there is a very large part must carry out mechanical decoking, otherwise can have a strong impact on working effect and the service life of quenching boiler.Therefore, develop heat-transfer effect excellence and can be convenient to the enhanced heat transfer component of mechanical decoking and comprise that the quenching boiler of this enhanced heat transfer component is the prior development direction of current quenching boiler.
Summary of the invention
The object of this invention is to provide a kind of new quenching boiler and the application of described quenching boiler in chemical field.
The invention provides a kind of quenching boiler, wherein, described quenching boiler has heat exchanger tube 10, and the diameter of described heat exchanger tube 10 is D, in this heat exchanger tube, is provided with enhanced heat transfer component, and this enhanced heat transfer component comprises twisted sheet, on this twisted sheet, has hole.
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 and/or the second twisted sheet 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.
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 described 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.
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.
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.
Preferably, 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.
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 15D-75D, be preferably 25D-50D.
Preferably, the diameter of the vertical core of described the first enhanced heat transfer component is 0.05D-0.95D, is preferably 0.05D-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 3 and/or the diameter of described the second sleeve pipe are 0.05D-0.95D, are preferably 0.05D-0.8D.
Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet 2 is 0.05-0.95, is preferably 0.05-0.8.
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 °.
Preferably, the diameter D of described heat exchanger tube is 5-200mm, is preferably 30-150mm.
The present invention also provides the application in chemical field according to quenching boiler of the present invention.
Pass through technique scheme, in heat exchanger tube 10, add the twisted sheet with perforate, thereby reduce the diameter of the heat exchanger tube of quenching boiler, the heat transfer property of quenching boiler is improved, reduce hot loss of energy, reduce the coking rate of quenching boiler, also made described quenching boiler under Parking condition, can carry out online coke cleaning and mechanical decoking, improved the overall performance of quenching boiler.
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 schematic diagram of quenching boiler provided by the invention;
Fig. 2 is the sectional view with the heat exchanger tube of the first enhanced heat transfer component;
Fig. 3 is the side view of heat exchanger tube as shown in Figure 2, 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. 4 is the sectional view with the heat exchanger tube of the second enhanced heat transfer component;
Fig. 5 is the side view of heat exchanger tube as shown in Figure 4, 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. 6 is the sectional view with the heat exchanger tube of the 3rd enhanced heat transfer component;
Fig. 7 is the side view of heat exchanger tube as shown in Figure 6, 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. 8 is the axial cutaway view that is provided with the heat exchanger tube of described enhanced heat transfer component;
Fig. 9 is the axial cutaway view that is provided with the heat exchanger tube of described enhanced heat transfer component.
Description of reference numerals
1 '-cracking gas entrance; 2 '-water inlet; The outlet of 3 '-cracking gas; The outlet of 4 '-steam; 1-the first twisted sheet; 2-the second twisted sheet; 3-the first sleeve pipe; 10-heat exchanger tube
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 quenching boiler under working condition, the namely direction shown in accompanying drawing as " upper and lower, left and right ".
The invention provides a kind of quenching boiler, wherein, described quenching boiler has heat exchanger tube 10, and the diameter of described heat exchanger tube 10 is D, 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.
The effect of described quenching boiler is for cooling.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.
According to the present invention, when cracked gas stream is during through enhanced heat transfer component of the present invention, described twisted sheet in described enhanced heat transfer component forces cracking gas to change over from original plunger flow state the state that rotation is advanced, increase heat exchange area on the one hand, on the other hand, forced cracking gas to produce lateral flow, the tube wall of exchange heat pipe 10 forms strong washing away, make the reduced thickness of the boundary layer fluid layer that thermal resistance is large, thereby improve heat transfer effect, to reach augmentation of heat transfer and to reduce the object of coking rate.In addition, in the heat exchanger tube 10 of described quenching boiler, on twisted sheet, there is hole, thereby can, in improving heat-transfer effect, reduce convection cell and flow through the resistance of heat exchanger tube 10, and be convenient to carry out coke cleaning.
Pass through technique scheme, in described heat exchanger tube 10, add the twisted sheet with perforate, thereby reduce the diameter of the heat exchanger tube of quenching boiler, the heat transfer property of quenching boiler is improved, reduce hot loss of energy, reduce the coking rate of quenching boiler, can also under Parking condition, carry out online coke cleaning and mechanical decoking, improved the overall performance of quenching boiler.
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 shown in Figures 2 and 3, on this first twisted sheet, 1 has 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 10 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 1 thering is vertical core on the first twisted sheet, 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 technique scheme, in heat exchanger tube 10, add the twisted sheet with perforate, thereby reduce the diameter of the heat exchanger tube of quenching boiler, the heat transfer property of quenching boiler is improved, reduce hot loss of energy, reduce the coking rate of quenching boiler, can also under Parking condition, carry out online coke cleaning and mechanical decoking, improved the overall performance of quenching boiler.
The second enhanced heat transfer component comprises the first twisted sheet 1 and the first sleeve pipe 3, and as shown in Figures 3 and 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 2,2 cross-drilled holes that are provided with the edge closure that runs through the surface of the second twisted sheet 2 and form on this second twisted sheet, as shown in Figures 6 and 7.
On the second twisted sheet of the 3rd enhanced heat transfer component, the perforate direction of 2 cross-drilled hole 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.
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 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 15D-75D, 25D-50D more preferably.
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 can be 15D-75D, be preferably 25D-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 as mentioned above, in the present invention, in heat exchanger tube 10, enhanced heat transfer component 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.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.But generally speaking, the cracking gas of being drawn by pyrolysis furnace is the highest in the temperature of quenching boiler porch, along with cracking gas advances along the future of utmost point cold boiler, the temperature of cracking gas declines gradually.Therefore, in order to make augmentation of heat transfer effect more obvious, preferably, be at least provided with described enhanced heat transfer component apart from the position of tube side entrance 0-0.3m, more preferably the position of 0-0.1m is provided with described enhanced heat transfer component; And if when described heat exchanger tube 10 comprises multiple enhanced heat transfer component, the set-up mode of described enhanced heat transfer component in heat exchanger tube 10 can be discontinuous setting, for example, as shown in Figure 8, between any two adjacent enhanced heat transfer components, all there is a determining deviation; Also can be to arrange continuously, as shown in Figure 9, adjacent two enhanced heat transfer components can closely be close to.According to the actual needs, the set-up mode of described enhanced heat transfer component can also be more complicated mode, and to this, those skilled in the art can know and know, will repeat no more at this.In the time that the set-up mode of described enhanced heat transfer component in heat exchanger tube 10 can be discontinuous setting, the present invention has no particular limits the spacing of two adjacent enhanced heat transfer components, 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 0.05D-0.95D, 0.05D-0.8D more preferably.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 the diameter of described the second sleeve pipe are 0.05D-0.95D, 0.05D-0.8D more preferably.Preferably, the ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet 2 is 0.05-0.95, is preferably 0.05-0.8.
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 5mm, and corresponding Kongzui minor diameter 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, more preferably 1-6.
Conventionally, the axial length of 180 ° of twisted sheet distortions with along with the ratio of diameter be distortion ratio.In the time that distortion ratio is larger, degreeof tortuosity is less, and the resistance to material and the lateral flow of material tendency are also less, and enhanced heat exchange effect is relatively weakened; When distortion is than more hour, degreeof tortuosity is larger, and lateral flow tendency and the heat transfer area of material are also larger, and enhanced heat exchange effect is better, but can relatively increase the resistance of Flow of Goods and Materials.The distortion ratio of enhanced heat transfer component can be adjusted according to actual conditions, will repeat no more at this.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.Preferably, the anglec of rotation of described enhanced heat transfer component is 90 °-1080 °, is preferably 120 °-360 °.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.
Usually, between the heat exchanger tube of quenching boiler and radiant coil, be connected by gas collecting apparatus, that is to say many radiant coils are concentrated in together with heat exchanger tube and are connected.But heat exchanger tube provided by the invention can directly be connected with radiating furnace tube, thereby improve heat transfer efficiency.
According to the present invention, the diameter of described heat exchanger tube 10 can be selected and change in wider scope, and for example, the diameter of described heat exchanger tube 10 can be 5-200mm, be preferably 30-150mm.
According to the present invention, the fixed form of described enhanced heat transfer component in heat exchanger tube 10 can be existing variety of way, for example, can adopt vacuum metallurgy investment pattern precision casting to form 10 entirety of the heat exchanger tube with above-mentioned enhanced heat transfer component, or adopt the method for forging to process two one-tenth, or the method by welding processes, meet and in practical application, exchange heat pipe 10 requirement of strength.
According to the present invention, described heat exchanger tube 10 can be along being arranged in described quenching boiler with the axial direction level of quenching boiler housing, vertical or any incline direction, and many heat exchanger tube 10 preferred parallel settings.
If be equipped with described enhanced heat transfer component in the every heat exchanger tube 10 of cooling boiler, the effect of augmentation of heat transfer is no doubt good, but the resistance of material can increase, thereby can affect the flow velocity of material.Therefore, preferably, be arranged in described quenching boiler in the mode of space with the heat exchanger tube 5 of enhanced heat transfer component.
The present invention is not particularly limited the material of described enhanced heat transfer component, as long as have good thermal conductivity and can meet industrial demand, under preferable case, the material of described enhanced heat transfer component is identical with the material of described heat exchanger tube 10.
The present invention is not specifically limited for the version of quenching boiler, can be at existing various forms quenching boiler, can be for example the useless pot of traditional type quenching boiler, bathtub formula chilling, Linear shape cooling boiler, two honeycomb duct type quenching boiler and U-shaped tubular type quenching boiler etc.
According to the present invention, the heat exchanger tube 10 of described quenching boiler is directly connected with described radiant coil, can know these those skilled in the art.
In addition, the present invention also protects the application of quenching boiler of the present invention in chemical field.
Below by embodiment, the present invention is described in more details.
Be further described as an example of the Linear shape cooling boiler in the CBL-III type pyrolysis furnace of 60,000 tons of annual outputs example herein.
Illustrate that the quenching boiler that is provided with enhanced heat transfer component provided by the invention is in the application of hydrocarbon cracking technique in chilling heat-exchange system.
In pyrolysis furnace, after cracking, obtain temperature through said method take hydrogenation tail oil as cracking stock as 850 ℃ of cracking gases, the cracking gas of gained is carried out in quenching boiler to chilling, wherein, in heat exchanger tube 10 in this quenching boiler, be provided with 4 enhanced heat transfer components, wherein 1 enhanced heat transfer component is welded in the tube side porch of described heat exchanger tube 10, and all the other 3 enhanced heat transfer component uniform weldings are in described heat exchanger tube 10.Described enhanced heat transfer component is the first enhanced heat transfer component,, comprises the first twisted sheet 1 that is, 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.The internal diameter of described heat exchanger tube 10 is 35mm, and the diameter of vertical core is 8.75mm, and described enhanced heat transfer component is 70mm along the axial length of described heat exchanger tube 10, and the anglec of rotation of described enhanced heat transfer component is 120 °.
The cracking gas that pyrolysis furnace is drawn is provided with the heat exchanger tube 10 of described enhanced heat transfer component described in heat exchanger tube 10 tube side entrances are introduced, and from the material channel described enhanced heat transfer component of flowing through, flows out from tube side outlet, obtains the cracking gas after heat exchange.The cycle of operation of this quenching boiler is 100 days, and along with the increase of running time, the temperature of the thickness of burnt layer, Pressure Drop, tube side outlet, the result of heat exchange amount are as shown in table 1.
Table 1
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.1169 | 405 | 0.3741 |
| 10 | 0.48 | 0.1219 | 442 | 0.3427E7 |
| 20 | 0.96 | 0.1264 | 474 | 0.3150E7 |
| 30 | 1.44 | 0.1307 | 501 | 0.2911E7 |
| 40 | 1.92 | 0.1347 | 524 | 0.2700E7 |
| 50 | 2.4 | 0.1385 | 545 | 0.2514E7 |
| ? | ? | ? | Total heat | 1.85E7 |
Comparative example 1
This comparative example is for illustrating the application of reference quenching boiler at hydrocarbon cracking technique chilling heat-exchange system.
According to the method for embodiment 1, hydrogenation tail oil cracking gas is carried out to chilling, different, in the heat exchanger tube 10 of described quenching boiler, be not provided with enhanced heat transfer component.The cycle of operation of this quenching boiler is 50 days, and along with the increase of running time, the temperature of the thickness of burnt layer, step-down, tube side outlet, the result of heat exchange amount are as shown in table 2.
Table 2
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.1052 | 411 | 0.3861 |
| 10 | 0.67 | 0.111 | 461 | 0.3263E7 |
| 20 | 1.34 | 0.1163 | 500 | 0.2916E7 |
| 30 | 2 | 0.1210 | 531 | 0.2632E7 |
| 40 | 2.67 | 0.1255 | 558 | 0.2389E7 |
| 50 | 3.33 | 0.1297 | 580 | 0.2186E7 |
| ? | ? | ? | Total heat | 1.71E7 |
Can find out from the contrast of embodiment 1 and comparative example 1, compared with not being provided with the quenching boiler of enhanced heat transfer component, adopt the quenching boiler that is provided with enhanced heat transfer component of the present invention to carry out chilling to the cracking gas take hydrogenation tail oil as cracking stock, move after 50 days, total heat transfer has increased by 8.2%, tube side outlet temperature has reduced by 35 ℃, thickness of coke layer also attenuate 28%.
Illustrate that the quenching boiler that is provided with enhanced heat transfer component provided by the invention is in the application of hydrocarbon cracking technique in chilling heat-exchange system.
In pyrolysis furnace, after cracking, obtain temperature through said method take naphtha as cracking stock as 850 ℃ of cracking gases, the cracking gas of gained is carried out in quenching boiler to chilling, wherein, in heat exchanger tube 10 in this quenching boiler, be provided with 5 enhanced heat transfer components, wherein 1 enhanced heat transfer component is welded in the tube side porch of described heat exchanger tube 10, and all the other 4 enhanced heat transfer component uniform weldings are in described heat exchanger tube 10.Described enhanced heat transfer component is the second enhanced heat transfer component,, comprises the first twisted sheet 1 and the first sleeve pipe 3 being arranged among described the first twisted sheet 1 that is, and the inward flange of this first twisted sheet 1 is connected with the outer surface of described the first sleeve pipe 3.The diameter of heat exchanger tube 10 is 20mm, and the diameter of the first sleeve pipe 3 is 10mm, and described enhanced heat transfer component is 70mm along the axial length of described heat exchanger tube 10, and the anglec of rotation of described enhanced heat transfer component is 360 °.
The cracking gas that pyrolysis furnace is drawn is provided with the heat exchanger tube 10 of described enhanced heat transfer component described in heat exchanger tube 10 tube side entrances are introduced, and from the material channel described enhanced heat transfer component of flowing through, flows out from tube side outlet 7, obtains the cracking gas after heat exchange.The cycle of operation of this quenching boiler is 100 days, and along with the increase of running time, the temperature of the thickness of burnt layer, step-down, tube side outlet, the result of heat exchange amount are as shown in table 3.
Table 3
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.0824 | 398 | 0.3589 |
| 10 | 0.1 | 0.0832 | 406 | 0.3534E7 |
| 20 | 0.2 | 0..084 | 414 | 0.3478E7 |
| 30 | 0.3 | 0.0847 | 421 | 0.3423E7 |
| 40 | 0.4 | 0.0855 | 428 | 0.3369E7 |
| 50 | 0.5 | 0.0862 | 435 | 0.3317E7 |
| 60 | 0.6 | 0.0869 | 442 | 0.3265E7 |
| ? | ? | ? | Total amount of heat | 2.3975E7 |
Comparative example 2
This comparative example is for illustrating the application of reference quenching boiler at hydrocarbon cracking technique chilling heat-exchange system.
According to the method for embodiment 2, naphtha pyrolysis gas is carried out to chilling, different, in the heat exchanger tube 10 of described quenching boiler, be not provided with enhanced heat transfer component.The cycle of operation of this quenching boiler is 60 days, and along with the increase of running time, the temperature of the thickness of burnt layer, step-down, tube side outlet, the result of heat exchange amount are as shown in table 4.
Table 4
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.0742 | 405 | 0.3539 |
| 10 | 0.2 | 0.0756 | 421 | 0.3427E7 |
| 20 | 0.4 | 0.0768 | 435 | 0.3320E7 |
| 30 | 0.6 | 0.078 | 449 | 0.3218E7 |
| 40 | 0.8 | 0.0792 | 462 | 0.3120E7 |
| 50 | 1.0 | 0.0804 | 474 | 0.3026E7 |
| 60 | 1.2 | 0.0815 | 486 | 0.2936E7 |
| ? | ? | ? | Total heat | 2.2586E7 |
Can find out from the contrast of embodiment 2 and comparative example 2, compared with the quenching boiler not being provided with enhanced heat transfer component, adopt the quenching boiler that is provided with enhanced heat transfer component of the present invention to carry out chilling to the cracking gas take hydrogenation tail oil as cracking stock, move after 60 days, total heat transfer has increased by 6.1%, tube side outlet temperature has reduced by 44 ℃, thickness of coke layer also attenuate 50%.
Illustrate that the quenching boiler that is provided with enhanced heat transfer component provided by the invention is in the application of hydrocarbon cracking technique in chilling heat-exchange system.
In pyrolysis furnace, after cracking, obtain temperature through said method take ethane as cracking stock as 850 ℃ of cracking gases, the cracking gas of gained is carried out in quenching boiler to chilling, wherein, in heat exchanger tube 10 in this quenching boiler, be provided with 6 enhanced heat transfer components, wherein 1 enhanced heat transfer component is welded in the tube side porch of described heat exchanger tube 10, and all the other 5 enhanced heat transfer component uniform weldings are in described heat exchanger tube 10.Described enhanced heat transfer component is the 3rd enhanced heat transfer component,, comprises the second twisted sheet 2 that is, 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 ratio of the area of the area of described cross-drilled hole and whole described the second twisted sheet 2 is 0.5.The internal diameter of described heat exchanger tube 10 is 50mm, and described enhanced heat transfer component is 70mm along the axial length of described heat exchanger tube 10, and the anglec of rotation of described enhanced heat transfer component is 240 °.
The cracking gas that pyrolysis furnace is drawn is provided with the heat exchanger tube 10 of described enhanced heat transfer component described in heat exchanger tube 10 tube side entrances are introduced, and from the material channel described enhanced heat transfer component of flowing through, flows out from tube side outlet, obtains the cracking gas after heat exchange.The cycle of operation of this quenching boiler is 120 days, and along with the increase of running time, the temperature of the thickness of burnt layer, step-down, tube side outlet, the result of heat exchange amount are as shown in table 5.
Table 5
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.0629 | 379 | 0.3348E7 |
| 20 | 0.08 | 0.0634 | 384 | 0.3313E7 |
| 40 | 0.16 | 0.0638 | 391 | 0.3278E7 |
| 60 | 0.24 | 0.0643 | 396 | 0.3242E7 |
| 80 | 0.32 | 0.0649 | 401 | 0.3208E7 |
| ? | ? | ? | Total heat | 1.6389E7 |
Comparative example 3
This comparative example is for illustrating the application of reference quenching boiler at hydrocarbon cracking technique chilling heat-exchange system.
According to the method for embodiment 3, ethane cracking gas is carried out to chilling, different, in the heat exchanger tube 10 of described quenching boiler, be not provided with enhanced heat transfer component.The cycle of operation of this quenching boiler is 80 days, and along with the increase of running time, the temperature of the thickness of burnt layer, step-down, tube side outlet, the result of heat exchange amount are as shown in table 6.
Table 6
| The number of days of periodic duty | Thickness of coke layer mm | Pressure Drop (kg/m 2) | Tube side outlet temperature (℃) | Heat exchange amount cal/h |
| 0 | 0 | 0.0566 | 385 | 0.3310E7 |
| 20 | 0.125 | 0.0573 | 394 | 0.3255E7 |
| 40 | 0.25 | 0.0579 | 403 | 0.3201E7 |
| 60 | 0.375 | 0.0585 | 411 | 0.3146E7 |
| 80 | 0.5 | 0.0592 | 420 | 0.3092E7 |
| ? | ? | ? | Total heat | 1.6004E7 |
Can find out from the contrast of embodiment 3 and comparative example 3, compared with the quenching boiler not being provided with enhanced heat transfer component, adopt the quenching boiler that is provided with enhanced heat transfer component of the present invention to carry out chilling to the cracking gas take hydrogenation tail oil as cracking stock, move after 80 days, total heat transfer has increased by 2.4%, tube side outlet temperature has reduced by 19 ℃, thickness of coke layer also attenuate 36%.
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 (14)
1. a quenching boiler, is characterized in that, described quenching boiler has heat exchanger tube (10), and the diameter of described heat exchanger tube (10) is D, 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. quenching boiler 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. quenching boiler 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 described 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. quenching boiler 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 quenching boiler 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 quenching boiler 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. quenching boiler according to claim 6, is characterized in that, multiple described enhanced heat transfer components are set in described heat exchanger tube (10), and the axial distance between adjacent described enhanced heat transfer component is 15D-75D, be preferably 25D-50D.
8. quenching boiler according to claim 3, is characterized in that, the diameter of the vertical core of described the first enhanced heat transfer component is 0.05D-0.95D, be preferably 0.05D-0.8D.
9. quenching boiler according to claim 4, is characterized in that, the diameter of described the second enhanced heat transfer component vertical core and/or the diameter of described the first sleeve pipe (3) and/or the diameter of described the second sleeve pipe be 0.05D-0.95D, be preferably 0.05D-0.8D.
10. quenching boiler 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 (2) is 0.05-0.95, be preferably 0.05-0.8.
11. quenching boilers 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, be preferably 1-6.
12. quenching boilers 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. quenching boilers according to claim 14, is characterized in that, the diameter D of described heat exchanger tube (10) is 5-200mm, be preferably 30-150mm.
14. application in chemical field according to the quenching boiler described in claim 1-13.
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| CN201210426135.5A CN103791761B (en) | 2012-10-30 | 2012-10-30 | Quenching boiler and its application |
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| CN201210426135.5A CN103791761B (en) | 2012-10-30 | 2012-10-30 | Quenching boiler and its application |
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| CN202063878U (en) * | 2010-12-04 | 2011-12-07 | 卓然(靖江)设备制造有限公司 | Novel twisted slice tube of heating furnace |
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| CN1239217A (en) * | 1998-06-11 | 1999-12-22 | 祁和益 | Heat exchange tube with additional structure for adding heat transfer area |
| CN101846469A (en) * | 2009-03-26 | 2010-09-29 | 中国石油化工股份有限公司 | Heat exchanger with twisted sheet |
| CN101893396A (en) * | 2009-05-21 | 2010-11-24 | 中国石油化工股份有限公司 | Quenching boiler provided with enhanced heat transfer member |
| CN101846477A (en) * | 2010-06-11 | 2010-09-29 | Bac大连有限公司 | Reinforcing heat transfer method and heat exchange coil tube component for evaporative heat exchanger |
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