CN104893752A - Double-inclined-trapezoidal horizontal tube double-sided radiant vacuum furnace for deep vacuum distillation of heavy crude oil - Google Patents
Double-inclined-trapezoidal horizontal tube double-sided radiant vacuum furnace for deep vacuum distillation of heavy crude oil Download PDFInfo
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Abstract
The invention discloses a double-inclined-trapezoidal horizontal tube double-sided radiant vacuum furnace for deep vacuum distillation of heavy crude oil. The double-inclined-trapezoidal horizontal tube double-sided radiant vacuum furnace comprises an atmospheric pressure residual oil furnace body, a radiation chamber, a convection chamber, a radiation hearth, furnace tubes and wall-attached combustors, wherein the side wall of the radiation hearth is double-inclined-trapezoidal from bottom to top and sequentially comprises a first inclined wall, a first straight wall, a second inclined wall and a second straight wall, and the first inclined wall and the second inclined wall are respectively inclined towards the inside of the radiation hearth; the wall-attached combustors are located at two sides of the axial directions of radiant tubes and are distributed along the bottoms of the first inclined wall and the second inclined wall, and each wall-attached combustor forms a double-inclined-trapezoidal double-sided radiant heating furnace in a way of combusting along the furnace wall; and three-grade expansion is set at outlet pipe segments at the rears of the radiant tubes corresponding to each group of furnace tubes, and after the final-stage expansion is finished, the cross section of each radiant tube is elliptic, the long-axis direction of the ellipse faces to the radiant direction of flame of each combustor, and the short-axis direction is vertical to the radiant direction of the flame.
Description
Technical field
The present invention relates to petrochemical industry, in particular to the trapezoidal heavy crude of a kind of diclinic (API≤22) deep vacuum distillation (subtracting slag TBP >=565 DEG C) lying pipe double-side radiation vacuum furnace.
Background technology
Atmospheric and vacuum distillation technique is by obtaining the physical fractionation process of required straight-run spirit, kerosene, diesel oil, wax oil and vacuum residuum after heating through normal pressure/underpressure distillation by crude oil.In recent years, because price difference high between conventional crude and heavy crude is to refining oil the high benefit brought, the ratio of refinery processing heavy, crude oil with poor quality (API≤22) constantly increases.Simultaneously because environmental requirement progressively improves, refinery is in order to improve the seed output and quality of transport fuel oil, need to increase the decompressed wax oil cut going hydrocracking or catalytic cracking, reduce the Cushion blasting of defocusing, improve high-quality environmental protection benzoline productive rate, thus increase full factory economic benefit, adopt deep vacuum distillation (subtracting slag TBP >=565 DEG C) technology to become development trend for this reason.Wherein vacuum furnace realizes deep vacuum distillation (subtracting slag TBP >=565 DEG C), the key equipment obtaining decompressed wax oil more.The heating under reduced pressure stove that current domestic refinery is running, still adopt standpipe or the lying pipe single side radiation heat transfer type of furnace, burner is the straight flame of dolly, non-attached wall burning pattern.When carrying out the operation of heavy crude deep vacuum distillation, vacuum furnace temperature out must raise (405 DEG C ~ 450 DEG C), to cause the even coefficient of circumferential asymmetry of single side radiation pattern Tube surface heat strength up to 1.89, localized heat intensity towards flame boiler tube is very high, too high local surfaces hot strength causes oil product oil film temperature to raise, accelerate the hot polymerization condensation reaction of medium in boiler tube, coking is made to be inclined to aggravation, coking speed is accelerated, thus affect Long-term Operation of Fired Heaters, cause full factory unplanned shutdown, otherwise decompression extracting rate need be reduced and reduce treatment capacity, but all affect refinery's economic benefit.
For heavy crude (API≤22) when deep vacuum distillation (subtracting slag TBP >=565 DEG C), the tube coking excessive velocities problem that single side radiation heating under reduced pressure stove exists, the suppression coking technology that domestic and international refinery takes mainly contains following 2 points: one is by water filling steam in boiler tube, improve oil product linear speed in boiler tube, slow down coke deposition in pipe.Two is expanding by carrying out 2 ~ 4 grades at radiation chamber coil outlet depot siding place, to reduce the peak value oil film temperature of oil product in boiler tube, slows down the coking at outlet of still pipeline place.But aforesaid way does not all fundamentally improve the homogeneity of radiation indoor temperature field, reduce boiler tube hot strength circumference skewness coefficient, and to the coking rate limited use suppressing heavy crude (API≤22) when deep vacuum distillation (subtracting slag TBP >=565 DEG C).Water filling steam in boiler tube, adds the load of follow-up vacuum distillation tower pumped vacuum systems simultaneously, increases full device energy consumption and acid mine drainage amount.
Summary of the invention
Based on above-mentioned to current heavy crude (API≤22) when deep vacuum distillation (subtracting slag TBP >=565 DEG C), the analysis of vacuum furnace operation conditions, the present invention starts with from the internal cause of vacuum furnace coking, a kind of diclinic trapezoidal deep vacuum distillation double-side radiation vacuum furnace optimizing furnace type structure is proposed, make the surface heat intensity distribution of temperature field and radiating furnace tube up and down in burner hearth evenly, improve the homogeneity of flow of flue gas in radiation chamber simultaneously, be combined in boiler tube appropriate location again and note appropriate coking inhibitor, and change radiation chamber exit boiler tube pattern, thus reach and delay coking in vacuum furnace boiler tube, extend vacuum furnace and atmospheric and vacuum distillation unit operate continuously cycle, improve the object of refinery's economic benefit.
For achieving the above object, the invention provides a kind of diclinic trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, comprising: long residuum body of heater, radiation chamber, convection chamber, radiant box will, boiler tube and wall-attached burner, wherein:
Described convection chamber is positioned at above the bosom of described long residuum body of heater, and described convection chamber is divided into symmetrical two portions by partition wall, and the exhanst gas outlet above described convection chamber is provided with associating flue; Described radiation chamber has two, middle upper part in the middle of each described radiation chamber is described convection chamber, 2 described radiant box will are divided into by partition wall symmetry in the middle of each described radiation chamber, the side wall of each described radiant box will is trapezoidal in diclinic from down to up, comprise the first sloping core, the first stalk, the second sloping core and the second stalk in turn, described first sloping core and described second sloping core tilted respectively to described radiant box will;
Described boiler tube has 8 groups, often organize described boiler tube and comprise convection tubes and radiator tube, each part of horizontal of described convection chamber is furnished with many rows convection tubes corresponding to boiler tube described in 4 groups, longitudinal arrangement is provided with from top to bottom horizontally disposed in the middle part of each described radiant box will, many rows radiating furnace tube that described in 2 groups that are supported by boiler tube frame, boiler tube is corresponding, often organize convection tubes corresponding to described boiler tube to be connected with the transfer line of radiator tube outside body of heater, the entrance of described convection tubes is connected with processing medium entrance, the outlet of described radiator tube is connected with vacuum distillation tower by processing medium outlet transfer line,
The number of described wall-attached burner is multiple, and in the axial both sides of described radiator tube, arrange bottom described first sloping core He bottom described second sloping core, each described wall-attached burner forms the trapezoidal equiflux heater of diclinic in the mode of burning along furnace wall;
Often organize outlet pipe section place, radiator tube rear portion corresponding to boiler tube arrange 3 grades expanding, in the end one-level expanding after, radiator tube shape of cross section be oval, and the long axis direction of ellipse is towards burner flame radiation direction, and short-axis direction is perpendicular to flame radiaton direction;
In the front somewhere of expanding pipeline section, the rear portion of described radiator tube, fluid catalytic cracking decant oil inlet is set, be connected with described fluid catalytic cracking decant oil inlet, in order to note fluid catalytic cracking decant oil pipeline on be provided with flow control valve group.
Optionally, described fluid catalytic cracking decant oil inlet is arranged on rear 1/3 ~ 1/4 pipeline section of described radiating furnace tube.
Optionally, the height of described first sloping core is 2m ~ 4m, it is 0 ° ~ 15 ° with vertical line angle, described first stalk height is 0.8 ~ 1.5 times of described first sloping core height, described second sloping core height is 3m ~ 4m, be 5 ° ~ 15 ° with vertical line angle, described second stalk height is 0.8 ~ 1.5 times of described second sloping core height.
Optionally, the nozzle being arranged at the wall-attached burner bottom described first sloping core and described second sloping core tilts along described first sloping core and described second sloping core direction respectively, be 4 ° ~ 8 ° with vertical line angle, described wall-attached burner is 1.6m ~ 2.4m apart from the vertical range that described radiator tube pipe is arranged.
Optionally, the outer transfer line place of the stove between described convection tubes and described radiating furnace tube is provided with steam injection mouth, and described steam injection mouth is connected with the outer vapour line for system.
Optionally, the ovality of described oval cross section is between 1.1 ~ 1.4.
The diclinic trapezoidal lying pipe double-side radiation vacuum furnace of heavy crude of the present invention (API≤22) deep vacuum distillation (subtracting slag TBP cut point >=565 DEG C), the each radiant box will side wall of this vacuum furnace is from down to up in " diclinic ladder " shape, the horizontally disposed radiating furnace tube supported by boiler tube frame of longitudinal arrangement is provided with from top to bottom in the middle of each radiant box will, in the axial both sides of radiating furnace tube, the burner along furnace wall burning is equipped with bottom the first sloping core and the second sloping core, form the trapezoidal equiflux heater of diclinic, note coking inhibitor is adopted in boiler tube appropriate location, 3 grades of expanding proprietary technologies with adopting oval boiler tube.Thus realize the homogeneity improving heat transfer in radiation chamber, reduce the peak value oil film temperature of oil product in heating under reduced pressure stove boiler tube, improve oil product thermostability, slow down the effect of tube coking trend, reach and extend the vacuum furnace continuous cycle of operation (more than 3 years), produce the object bringing distinct economic to atmospheric and vacuum distillation unit and full factory, be embodied in:
1, the lying pipe double-side radiation vacuum furnace of heavy crude (API≤22) deep vacuum distillation (subtracting slag TB >=565 DEG C) is applicable to, namely be equipped with the wall-attached burner along furnace wall burning in the both sides of radiating furnace tube, two sides radiant flux heats to radiating furnace tube uniformly.Compared to single side radiation vacuum furnace, radiating furnace tube surface heat intensity is more even, in radiation chamber thermo parameters method also evenly, thus reduce boiler tube localized heat intensity significantly, improve the peak value oil film temperature of oil product, reduce the coking trend in boiler tube
2, " diclinic ladder " shape chamber structure, each radiant box will side wall in " diclinic ladder " shape, comprises the first sloping core, the first stalk, the second sloping core and the second stalk from down to up in turn.By reasonable disposition first sloping core and vertical line angle, the second sloping core and vertical line angle, cross section on radiation chamber is reduced gradually, distance between radiation chamber inside and radiator tube diminishes, improve flow of flue gas speed, decrease radiation chamber upper smoke gas eddy stream, reach the object improving radiation chamber top radiator tube radiative transfer and transmission of heat by convection, thus improve burner hearth upper and lower part uniform distribution of temperature field, further increase top and the bottom radiator tube surface heat intensity and hot strength circumference distributing homogeneity.
3, wall-attached burner is arranged at bottom the first sloping core and the second sloping core respectively, and wall-attached burner nozzle tilts along the first sloping core and the second sloping core direction respectively, is 4 ° ~ 8 ° with vertical line angle.The vertical range of burner distance radiating furnace tube pipe row is 1.6m ~ 2.4m.Make to spray low NO
xthe better attached wall burning of secondary combustion flame of burner, avoids flame directly to flutter boiler tube, forms more uniform radiant wall radiative transfer, and its high-temperature flue gas stream is also stable upwards to flow, and reduces flue gas bias current, backflow phenomena.
4, certain pipe position before the expanding pipeline section in the rear portion of radiating furnace tube, about rear 1/3 ~ 1/4 pipeline section of radiating furnace tube, arranges coking inhibitor, i.e. fluid catalytic cracking decant oil inlet, in order to note fluid catalytic cracking decant oil pipeline on be provided with flow control valve.Can to add in boiler tube the bitum high-temperature digestion degree of dispersion medium in residual oil system, the phase transformation that inhibit bituminous matter in boiler tube to occur because of high-temperature polycondensation is separated deposition, improves the thermostability of medium in boiler tube, slow down green coke.The partial hydrogenation aromatic hydrocarbons structure simultaneously contained in fluid catalytic cracking decant oil, has hydrogen supply effect, effectively can stablize the macromolecular radical that long residuum thermolysis produces, and suppresses the condensation coking reaction of medium in boiler tube further.
5, often organize the radiation section outlet pipe section place of described radiating furnace tube, arrange 3 grades expanding, in the end one-level expanding after, boiler tube shape of cross section is oval, and oval long axis direction is towards burner flame radiation direction, and short-axis direction is perpendicular to flame radiaton direction.Compared with the circular boiler tube of tradition, when cross-sectional area is equal, boiler tube specific surface area can be expanded, increase unit capacity heat transfer area, increase Tube surface heat strength, thus be more conducive to the radiative transfer of strengthening vacuum furnace in radiation section exit, be conducive to medium in boiler tube and, in the phase transformation in radiation section exit, improve the thermo-efficiency of vacuum furnace.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the diclinic trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace structural representation of one embodiment of the invention.
Drawing reference numeral illustrates:
Vacuum furnace body of heater 1, convection chamber 2, radiation chamber 3, radiant box will 4, convection tubes 5, radiator tube 6, burner 7, processing medium entrance 8, first sloping core 9, first stalk 10, second sloping core 11, second stalk 12, steam treatment entrance 13, fluid catalytic cracking decant oil inlet 14, processing medium outlet 15, variable valve group 16.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the diclinic trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace structural representation of one embodiment of the invention.As shown in the figure, diclinic trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace comprises: long residuum body of heater, radiation chamber 1, convection chamber 2, radiation chamber 3, radiant box will 4, boiler tube and wall-attached burner 7, often organizes boiler tube and comprises connected convection tubes 5 and radiator tube 6.
Long residuum body of heater 1 front appearance is diclinic ladder structure.Long residuum divides by processing medium entrance 8 with the feeding manner of " upper entering and lower leaving ".Successively through convection chamber 2, radiation chamber 3, be warming up to temperature required (about 420 ~ 430 DEG C) in processing medium outlet 15.Convection chamber 2 is positioned at above the bosom of body of heater 1, convection chamber 2 is divided into symmetrical two portions by partition wall, above convection chamber 2, exhanst gas outlet is provided with associating flue, the high-temperature flue gas that burner combustion produces flows into convection chamber 2 by radiation chamber 3, heated convection section boiler tube 5, flue gas flows to the further Mist heat recovering of air preheater through associating flue, makes stove design thermal efficiency reach 92.0%, enter air finally by by chimney, in figure, arrow A represents the direction of flue gas flow toward air preheater.Radiation chamber 3 has two, and the middle upper part of each radiation chamber 3 is convection chamber 2.Each radiation chamber 3 is divided into symmetry to be divided into 2 radiant box will 4 by furnace wall, and each radiant box will 4 side wall in " diclinic ladder " shape, comprises the first sloping core 9, first stalk 10, second sloping core 11 and the second stalk 12 from down to up in turn.Radiant box will 4 both sides first sloping core 9 and the second sloping core 11 all slope inwardly.
During concrete enforcement, the height of the first sloping core 9 is 2m ~ 4m (can be such as 2.4m), be 0 ° ~ 15 ° (can be such as 5 °) with vertical line angle, first stalk 10 is highly 0.8 ~ 1.5 times (can be such as 1.2 times) of the first sloping core 9 height, second sloping core 11 is tilted to radiant box will 4, second sloping core 11 is highly 3m ~ 4m (can be such as 3m), be 5 ° ~ 15 ° (can be such as 5 °) with vertical line angle, the second stalk 12 is highly 0.8 ~ 1.5 times (can be such as 1.0 times) of the second sloping core 11 height.
Boiler tube has 8 groups, often organize described boiler tube and include convection tubes 5 and radiator tube 6, each part of horizontal of convection chamber 2 is furnished with row's convection tubes 5 more than 4 groups, is provided with the 2 groups of radiating furnace tubes 6 supported by boiler tube frame of longitudinal arrangement level ornaments in the middle part of each radiant box will 4 from top to bottom.Convection tubes 5 is connected through the outer transfer line of body of heater 1 with radiator tube 6, the entrance of convection tubes 5 is connected with processing medium entrance 8, the outlet of radiator tube 6 is connected with vacuum distillation tower by processing medium outlet transfer line 15, and in figure, arrow B represents that the oil product after heating flows to the direction of vacuum distillation tower.
In the axial both sides of radiating furnace tube 6, be positioned at burner hearth both sides bottom the first sloping core 9 and the second sloping core 11, be respectively equipped with the wall-attached burner 7 burnt along furnace wall, form diclinic ladder equiflux heater.The nozzle of wall-attached burner 7 tilts along the first sloping core 9 and the second sloping core 11 direction respectively.
In the specific implementation, the nozzle being positioned at the wall-attached burner bottom the first sloping core and the second sloping core tilts along the first sloping core and the second sloping core direction respectively, is 4 ° ~ 8 ° with vertical line angle.The vertical range of burner distance radiating furnace tube pipe row is 1.6m ~ 2.4m.
The front somewhere of expanding pipeline section, the rear portion of radiator tube 6 (such as about radiating furnace tube latter 1/3 ~ 1/4 section), fluid catalytic cracking decant oil inlet 14 is set, in order to note fluid catalytic cracking decant oil pipeline on be provided with flow control valve group 16.
Wherein, fluid catalytic cracking decant oil comes from refinery catalytic cracking device externally extracting oil, obtained after deliming, sedimentation, filtration.When the steam flow of steam treatment entrance 13 be≤0.5wt% time, the injection rate of fluid catalytic cracking decant oil is 0.1wt%-0.3wt%, such as, in a specific embodiment, when the steam flow of steam treatment entrance 13 is 0.40m%, the injection rate of fluid catalytic cracking decant oil is 0.15m%.
Often organize the radiation section outlet pipe section place of radiating furnace tube 6, arrange 3 grades expanding.Such as caliber can be expanding to DN250 by DN100.In the end one-level expanding after, boiler tube shape of cross section is oval, and oval long axis direction is towards burner flame radiation direction, and short-axis direction is perpendicular to flame radiaton direction.
In the specific implementation, the ovality of boiler tube cross section can be arranged between 1.1 ~ 1.4.
In addition, the outer transfer line place of the stove between convection tubes and radiating furnace tube, also can arrange steam injection mouth, and steam used is from the outer vapour line for system.
Deep vacuum distillation (subtracting slag TBP >=565 DEG C) the vacuum furnace embodiment of above-mentioned heavy crude (API≤22), by adopting the diclinic trapezoidal lying pipe double-side radiation type of furnace, compare and traditional single side radiation type of furnace, significantly can reduce boiler tube localized heat intensity, the even coefficient of boiler tube hot strength circumferential asymmetry is made to drop to 1.45 ~ 1.65 from one side 1.89, radiating furnace tube surface heat intensity is more even, reduce the coking trend in boiler tube, also improve burner hearth upper and lower part uniform distribution of temperature field simultaneously.In the front somewhere of expanding pipeline section, the rear portion of radiating furnace tube, by injecting fluid catalytic cracking decant oil, reducing dielectric viscosity in boiler tube, improving the thermostability of medium in boiler tube, slow down green coke.In the normal steam injection amount situation of maintenance, by injecting appropriate fluid catalytic cracking decant oil cut, the temperature rise of pipe inner membrance can be made to drop to about <0.56 DEG C/day, thus reach the pyrocondensation green coke object suppressing medium in boiler tube.The vacuum furnace technical scheme of green coke in above-mentioned suppression boiler tube, makes the cycle of operation long 1.2 ~ 1.25 times more continuous in more in the past the domestic single side radiation vacuum furnace the applied vacuum furnace continuous cycle of operation.After the last step of the radiation section outlet pipe section often organizing described radiating furnace tube is expanding, boiler tube shape of cross section adopts oval, oval long axis direction is towards burner flame radiation direction, short-axis direction is perpendicular to flame radiaton direction, Tube surface heat strength can be made to improve 1.05 ~ 1.10 times, the radiative transfer of strengthening vacuum furnace in radiation section exit, improves the thermo-efficiency of vacuum furnace.
In sum, compared with prior art, the beneficial effect of the above embodiment of the present invention is embodied in:
(1) in above-described embodiment, 1 body of heater radiation chamber has two radiant box will, each radiant box will side wall is from down to up in " diclinic ladder " shape, the horizontally disposed radiating furnace tube supported by boiler tube frame of longitudinal arrangement is provided with from top to bottom in the middle of each radiant box will, in the axial both sides of radiating furnace tube, bottom the first sloping core and the second sloping core, be equipped with the burner along furnace wall burning, form the trapezoidal equiflux heater of diclinic.This structure not only increases the homogeneity of the surface heat intensity distribution of radiating furnace tube, reduces the peak value oil film temperature of medium in boiler tube, simultaneously due to " diclinic is trapezoidal " structure of radiation chamber burner hearth side wall, by reasonable disposition first sloping core and vertical line angle, second sloping core and vertical line angle, cross section on radiation chamber is reduced gradually, distance between radiation chamber inside and radiator tube diminishes, improve flow of flue gas speed, decrease radiation chamber upper smoke gas eddy stream, reach the object improving radiation chamber top radiator tube radiative transfer and transmission of heat by convection, thus improve on burner hearth, temperature of lower field distribution homogeneity, further increase top and the bottom radiator tube surface heat intensity and hot strength circumference distributing homogeneity.In addition, burner is arranged at the first sloping core and the second sloping core root, makes to spray low NO
xthe better attached wall burning of the secondary combustion flame of burner, the point type local coking phenomenon avoiding flame to attack boiler tube in retaliation causing, forms more uniform radiant wall radiative transfer, and its high-temperature flue gas stream is also stablized and upwards flowed, the bias current of minimizing flue gas, backflow phenomena.
(2) appropriate coking inhibitor-as fluid catalytic cracking decant oil is injected in the appropriate location (about rear 1/3 ~ 1/4 pipeline section of radiator tube) of radiator tube, in fluid catalytic cracking decant oil, fragrance point content is higher, dielectric viscosity in boiler tube can be reduced, to add in boiler tube the bitum high-temperature digestion degree of dispersion medium in medium colloidal dispersion, improve the thermostability of colloidal dispersion, the high temperature polycondensation that in boiler tube, bituminous matter occurs is inhibit to generate carbene, and produce the result being separated deposition, namely slow down green coke.The partial hydrogenation aromatic hydrocarbons structure simultaneously contained in fluid catalytic cracking decant oil, has hydrogen supply effect, effectively can stablize the macromolecular radical that long residuum thermolysis produces, and suppresses the condensation coking reaction of medium in boiler tube further.
(3) at the radiation section outlet pipe section place often organizing boiler tube, arrange 3 grades expanding, and in the end one-level expanding after, boiler tube shape of cross section changes ellipse into by circle, oval long axis direction is towards burner flame radiation direction, and short-axis direction is perpendicular to flame radiaton direction.Compared with round tube, under the condition of same circumference, the actual internal area of oval tube is less than pipe, can increase velocity of medium in boiler tube, slow down green coke; When cross-sectional area is equal, boiler tube specific surface area can be expanded, increase unit capacity heat transfer area, thus more be conducive to the radiative transfer of strengthening vacuum furnace in radiation section exit, improve the thermo-efficiency of vacuum furnace.In a word, the three technology measure adopting this patent to propose, makes the performance of heating under reduced pressure stove obtain larger lifting.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (6)
1. a diclinic trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, is characterized in that, comprising: long residuum body of heater, radiation chamber, convection chamber, radiant box will, boiler tube and wall-attached burner, wherein:
Described convection chamber is positioned at above the bosom of described long residuum body of heater, and described convection chamber is divided into symmetrical two portions by partition wall, and the exhanst gas outlet above described convection chamber is provided with associating flue; Described radiation chamber has two, middle upper part in the middle of each described radiation chamber is described convection chamber, 2 described radiant box will are divided into by partition wall symmetry in the middle of each described radiation chamber, the side wall of each described radiant box will is trapezoidal in diclinic from down to up, comprise the first sloping core, the first stalk, the second sloping core and the second stalk in turn, described first sloping core and described second sloping core tilted respectively to described radiant box will;
Described boiler tube has 8 groups, often organize described boiler tube and comprise convection tubes and radiator tube, each part of horizontal of described convection chamber is furnished with many rows convection tubes corresponding to boiler tube described in 4 groups, longitudinal arrangement is provided with from top to bottom horizontally disposed in the middle part of each described radiant box will, many rows radiating furnace tube that described in 2 groups that are supported by boiler tube frame, boiler tube is corresponding, often organize convection tubes corresponding to described boiler tube to be connected with the transfer line of radiator tube outside body of heater, the entrance of described convection tubes is connected with processing medium entrance, the outlet of described radiator tube is connected with vacuum distillation tower by processing medium outlet transfer line,
The number of described wall-attached burner is multiple, and in the axial both sides of described radiator tube, arrange bottom described first sloping core He bottom described second sloping core, each described wall-attached burner forms the trapezoidal equiflux heater of diclinic in the mode of burning along furnace wall;
Often organize outlet pipe section place, radiator tube rear portion corresponding to boiler tube arrange 3 grades expanding, in the end one-level expanding after, radiator tube shape of cross section be oval, and the long axis direction of ellipse is towards burner flame radiation direction, and short-axis direction is perpendicular to flame radiaton direction;
In the front somewhere of expanding pipeline section, the rear portion of described radiator tube, fluid catalytic cracking decant oil inlet is set, be connected with described fluid catalytic cracking decant oil inlet, in order to note fluid catalytic cracking decant oil pipeline on be provided with flow control valve group.
2. diclinic according to claim 1 trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, is characterized in that, described fluid catalytic cracking decant oil inlet is arranged on rear 1/3 ~ 1/4 pipeline section of described radiating furnace tube.
3. diclinic according to claim 1 trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, it is characterized in that, the height of described first sloping core is 2m ~ 4m, it is 0 ° ~ 15 ° with vertical line angle, described first stalk height is 0.8 ~ 1.5 times of described first sloping core height, described second sloping core height is 3m ~ 4m, is 5 ° ~ 15 ° with vertical line angle, and described second stalk height is 0.8 ~ 1.5 times of described second sloping core height.
4. diclinic according to claim 1 trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, it is characterized in that, the nozzle being arranged at the wall-attached burner bottom described first sloping core and described second sloping core tilts along described first sloping core and described second sloping core direction respectively, be 4 ° ~ 8 ° with vertical line angle, described wall-attached burner is 1.6m ~ 2.4m apart from the vertical range that described radiator tube pipe is arranged.
5. diclinic according to claim 1 trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, it is characterized in that, the outer transfer line place of stove between described convection tubes and described radiating furnace tube is provided with steam injection mouth, and described steam injection mouth is connected with the outer vapour line for system.
6. diclinic according to claim 1 trapezoidal heavy crude deep vacuum distillation lying pipe double-side radiation vacuum furnace, it is characterized in that, the ovality of described oval cross section is between 1.1 ~ 1.4.
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| CN109425223A (en) * | 2017-08-22 | 2019-03-05 | 中国石化工程建设有限公司 | Heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107033950A (en) * | 2016-04-29 | 2017-08-11 | 上海浩用节能工程有限公司 | Reforming furnace with flue heat step compensation |
| CN109425223A (en) * | 2017-08-22 | 2019-03-05 | 中国石化工程建设有限公司 | Heating furnace |
| CN107541247A (en) * | 2017-10-04 | 2018-01-05 | 山东胜星化工有限公司 | A kind of sump oil continues uninterrupted freshening device |
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Application publication date: 20150909 |