CN104123425B - Crude oil pipeline preheats operation thermal procession emulation mode - Google Patents
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Abstract
The invention discloses a kind of crude oil pipeline to preheat operation thermal procession emulation mode, including：Preheating method selection and safety evaluatio are configured；Input pipe parameter, medium and soil physical factors between each station；Import and calculate grid；Calculating parameter initializes and utilizes Finite Volume Method for Air and calculate heat exchange amount between Soil Temperature Field, computer tube stream and soil finite difference calculus, thermodynamic features collimation method solves pipe flow medium relevant parameter；Obtain temperature, the pressure of the latter node of pipeline section；Determine each node operational factor along pipeline；Preheating safety evaluatio simultaneously exports to result.
Description
Technical field
The present invention relates to the long-range conveying technology field of oil, more particularly to a kind of preheating operation thermal procession of crude oil pipeline to imitate
True method.
Background technology
Important component of the pipeline transportation as modern transportation system, have cost of transportation is low, security reliability it is high with
And the unique advantages such as environmental pollution is small, transported particularly suitable for the long range of the inflammable and explosive dangerous goods such as crude oil, product oil and natural gas
It is defeated.
In recent years, as the economic steady-state growth of world's emerging economy and developed economies economic recovery, the world are mainly big
State increasingly improves to the demand of the energy, therefore the pace of construction of oil-gas pipeline is also accelerated.By the end of the year 2008, world's crude oil pipeline
Main line total length is more than 40 × 104km.China has also welcome the pipe-line construction climax of a new round, it is contemplated that to " 12 " end
Phase, China's pipeline total kilometrage will break through 15 × 104km.At that time, long-distance transmission pipeline will undertake the Crude Oil Transportation in China 70%
Task.
With China's plumbing installations " base on our country, developing overseas " implementation, Western crude pipeline, the Sudan 1/2/4
A series of large-scale pipeline engineerings both at home and abroad such as area's crude oil pipeline, the area's crude oil pipeline of the Sudan 3/7 and China-Russia Crude Oil Pipeline are constructed and put into operation.
With the construction of national strategy energy source pathway, will also there are large quantities of crude oil pipeline engineerings to build up and operation of putting into production.These crude oil
In pipeline engineering, have be greatly heated transportation crude oil pipeline.The safe and stable operation of these hot oil pipelines, for
Ensure that national energy security is significant.
As the critical stage that production run is transferred to by construction, the operation process of hot oil pipeline is for detection pipeline
Design and construction quality are significant.Different from the crude oil pipeline of isothermal conveying, hot oil pipeline is during operation, pipeline
And its surrounding soil temperature field is in transient state all the time, and this is one and is related to media flow in pipe and couples and manage with heat transfer
Double coupled problems that interior media for heat exchange couples with managing outer thermal conduction of soil, this stage any accident or scheduled shut-down are all by the solidifying pipe of increase
Risk.
Therefore, for make pipe safety, be smoothly transferred to normal operating phase, it is necessary to hot oil pipeline preheating the operation stage
Involved thermal procession is clearly described.On the other hand, it is still a blank for above-mentioned pipeline simulation software.
The content of the invention
It is an object of the invention to provide a kind of crude oil pipeline to preheat operation thermal procession emulation mode, to solve above-mentioned ask
Topic.
In order to achieve the above object, the technical proposal of the invention is realized in this way：
A kind of crude oil pipeline preheats operation thermal procession emulation mode, comprises the following steps：
Preheating method selection and safety evaluatio are configured；
Input pipe parameter, medium and soil physical factors between each station；
Import and calculate grid；
Calculating parameter initializes and utilizes Finite Volume Method for Air to calculate Soil Temperature Field, computer tube stream and soil with finite difference calculus
Heat exchange amount, thermodynamic features collimation method between earth solve pipe flow medium relevant parameter；Obtain temperature, the pressure of the latter node of pipeline section；
Determine each node operational factor along pipeline；
Preheating safety evaluatio simultaneously exports to result.
It is preferred that also comprise the following steps：
Stopping transportation initializes；
Areas of dielectric mesh generation in pipe；
Judge that boundary position whether there is free convection；
If so, equivalent heat conductivity is then calculated, and to medium temperature in pipe and soil moisture couple solution；It is if it is not, then straight
Connect to medium temperature in pipe and soil moisture couple solution；
Shutdown time is judged, and exports the result of calculation of stopping transportation.
It is preferred that also comprise the following steps：
Restart safety evaluation initialization；
Mesh generation is carried out to medium mobile grid in pipe and carries out water force；
Mesh generation is carried out to pipeline and its surrounding soil fixed mesh and carries out thermodynamic computing；
Determine parameter interpolation between grid；
Each node operational factor is determined, is judged restarting the time, and exports the result of calculation restarted.
Compared with prior art, this have the advantage that：
A kind of crude oil pipeline preheating operation thermal procession emulation mode provided by the invention, above-mentioned analogy method is applied to big
The processing of data is measured, is simulated suitable for the thermal procession simulation process of the long distance oil pipeline of complicated landform.Buried deep fat pipe
During preheating is gone into operation, pipeline and surrounding soil temperature field are in transient state all the time in road, and during which any accident or plan stops
It is defeated all to increase solidifying manage-style danger.To be transferred to normal production run with making pipe safety, it is necessary to heating power to being related in warm
Process is accurately described.
Brief description of the drawings
Fig. 1 is that the basic procedure for the crude oil pipeline preheating operation thermal procession emulation mode that the embodiment of the present invention one provides shows
It is intended to；
Fig. 2 .1 are normal conveying condition calculating flow chart in the warm that the embodiment of the present invention one is related to；
Fig. 2 .2 are stopping transportation condition calculating flow chart in the warm that the embodiment of the present invention one is related to；
Fig. 2 .3 are that the warm that the embodiment of the present invention one is related to restarts safety evaluation calculation flow chart；
Fig. 2 .4 are the calculating type selection interface that the embodiment of the present invention one is related to；
Fig. 2 .5 are that the basic parameter that the embodiment of the present invention one is related to sets interface；
Fig. 2 .6 are the pipe flow medium parameter setting interface that the embodiment of the present invention one is related to；
Fig. 2 .7 are parameter setting interface between the station that the embodiment of the present invention one is related to；
Fig. 2 .8 are that the medium temperature along the line that the embodiment of the present invention one is related to is distributed display interface；
Fig. 2 .9 are the pipeline section Soil Temperature Field display interface that the embodiment of the present invention one is related to；
Fig. 2 .10 are oil temperature distribution along pipeline at the end of the forward direction that the embodiment of the present invention one is related to preheats；
Oil temperature distribution along pipeline at the end of the reverse preheating that Fig. 2 .11 are related to for the embodiment of the present invention one；
Fig. 2 .12 are the pipeline Soil Temperature Field that the embodiment of the present invention one is related to.
Embodiment
The present invention is described in further detail below by specific examples of the implementation and with reference to accompanying drawing.
Embodiment one
Referring to Fig. 1, the embodiment of the present invention one provides a kind of crude oil pipeline preheating operation thermal procession emulation mode, including
Following steps：
Step S100, preheating method selection and safety evaluatio are configured；
Step S200, pipe parameter, medium and soil physical factors between each station of input；
Step S300, import and calculate grid；
Step S400, calculating parameter initializes and utilizes Finite Volume Method for Air to calculate Soil Temperature Field, meter with finite difference calculus
Calculate the heat exchange amount between pipe stream and soil, thermodynamic features collimation method solves pipe flow medium relevant parameter；Obtain the latter node of pipeline section
Temperature, pressure；The methods of utilizing Finite Volume Method for Air and finite difference calculus, can solve to obtain pipe flow medium relevant parameter.
Step S500, each node operational factor along pipeline is determined；
Step S600, preheat safety evaluatio and result is exported.
It is preferred that also comprise the following steps：
Stopping transportation initializes；
Areas of dielectric mesh generation in pipe；
Judge that boundary position whether there is free convection；
If so, equivalent heat conductivity is then calculated, and to medium temperature in pipe and soil moisture couple solution；It is if it is not, then straight
Connect to medium temperature in pipe and soil moisture couple solution；
Shutdown time is judged, and exports the result of calculation of stopping transportation.
It is preferred that also comprise the following steps：
Restart safety evaluation initialization；
Mesh generation is carried out to medium mobile grid in pipe and carries out water force；
Mesh generation is carried out to pipeline and its surrounding soil fixed mesh and carries out thermodynamic computing；
Determine parameter interpolation between grid；
Each node operational factor is determined, is judged restarting the time, and exports the result of calculation restarted.
Above-mentioned emulation mode incorporation engineering actual demand, Rational Simplification is carried out to pipeline preheating operation process, established
The physical model of medium and pipeline soil heat exchange in pipe is described, using unstructured quadrilateral mesh and polar grid pair
Soil and wall section have carried out discrete, and discrete governing equation has been obtained using Finite Volume Method for Air.Develop friendly interface
Crude oil pipeline preheats operation thermodynamic computing software, and the real data pair during the engineering operation of application A Jiademu crude oil pipelines
The accuracy and applicability of institute's making software are verified.
Preheating operation thermal procession emulation mode to crude oil pipeline provided in an embodiment of the present invention below, (i.e. related software is opened
Hair) specific features do and illustrate：
Crude oil pipeline preheating operation thermal procession emulation mode is opening defeated process or in-service to newly-built buried heated pipeline
The handoff procedure that crude oil of low-coagulation pipeline changes defeated crude oil with high solidifying point carries out heating power emulation and stopped flow injection analysis analysis.This is developed soft
Part can act also as the ratio choosing and analysis that aid decision instrument is used for different preheating schemes.Software will be upper using Fortran77 language
State flowing and the solution procedure sequencing of the double coupled problems of heat transfer, and the friendship developed with Microsoft Visual Basic6.0
Mutual interface integrates, easy to use using the style at Windows user interface.The data of input can preserve, it is convenient and swift and
It is easily modified；As a result graphically export, simple and clear and abundant information.
The basic function of place of matchmakers's exploitation software first, and with the actual ginseng of Niger A Jiademu crude oil pipeline engineerings
Number, the function and its application method of each module of software are introduced, during finally being gone into operation using A Jiademu crude oil pipelines engineering
Real data is verified to the accuracy of institute's making software with applicability.
3.1 software basic functions：
On the basis of to a plurality of buried heated pipeline operation process carries out literature survey both at home and abroad, buried heat of combining closely
Oil-piping opens the practical problem faced during defeated operation, considers what is be likely to occur during buried heated pipeline preheating is gone into operation
Various operating modes, are developed《Crude oil pipeline preheats operation thermodynamic computing software》.Software mainly has following function：
(1) in-pipe inspection robot Work condition analogue
According to existing tender budget, the positive preheating of the newly-built buried heated pipeline of software solidification, forward and reverse preheating are (initial
Soil Temperature Field is nature) and in-service low solidifying oil-piping change and defeated high coagulate oily handoff procedure (initial soil temperature field is
Low solidifying oil-piping operation Steady-State Thermal Field) three kinds of different thermodynamic computing patterns., can be right for three kinds of thermodynamic computing patterns
Pipeline completely (allows heat stations, pumping plant not to combine cloth station), and crude oil temperature is distributed, frictional resistance and pipeline Soil Temperature Field carry out one
Bodyization calculates.Scheduled shut-down or accident stopping transportation for the in-pipe inspection robot stage, can be to the temperature drop of pipeline all fronts crude oil, pipeline week
Enclose the soil moisture to be calculated with the change of shutdown time, and restart safety evaluatio with what this carried out pipeline, can to
Surely pipeline under mode (constant flow is restarted, constant pressure is restarted and restarts according to pump characteristic curve) is restarted along linear flow rate
The related process parameters such as recovery situation, crude oil temperature, pressure change and the change of pipeline Soil Temperature Field are predicted.
(2) result of calculation exports
User can carry out the output of data file to software result of calculation according to being actually needed.The output text of software support
Part has：Medium temperature distribution along any time pipeline, along pipeline in the pipe of optional position medium mean temperature with the time change
Change, the soil monitoring point temperature of optional position changes with time along pipeline, arbitrary section is at any time along pipeline
Underground temperature field, and pipeline is under any operating mode after stopping transportation, restart process piping along line pressure, flow and temperature at any time
Between change.
(3) result of calculation graphic software platform
To show result of calculation, form is more directly perceived, and software can be to pipeline normal operation, all fronts of preheating finish time
Medium temperature distribution, frictional resistance are patterned display.In addition, to grasp soil thermal storage rule and aiding in carrying out safety evaluatio,
Software is reproduced to the partial function of the softwares of Tecplot 9.0, can be shown along any time pipeline at arbitrary section
Underground temperature field.
3.2 software design and development：
To realize above-mentioned software function, normal conveying operating mode, stopping transportation operating mode according to Fig. 2 .1 to Fig. 2 .3 and open again
The calculation flow chart of dynamic safety evaluation, is developed modular《Crude oil pipeline preheats operation thermodynamic computing software》, mainly include
Installation interface, main interface, basic parameter input, Work condition analogue and result of calculation output and five modules of graphic software platform.
(1) installation interface
Double-click " crude oil pipeline preheats operation thermodynamic computing software installation procedure .exe " files, selects software installation position,
Installed according to prompting.
(2) main interface
After the completion of software installation, by double-clicking " the crude oil pipeline preheating operation thermodynamic computing software .exe " under installation directory
Executable file, you can logged in.After input meets the username and password of mandate, you can into software main interface.Software
Main interface on share 5 title bars, correspond to the difference in functionality of software respectively, i.e., " file (F) ", " calculating parameter set (E) ",
" numerical simulation (V) ", " display pattern option (T) " and " helping (H) ".In software running process, the operation of each submodule is held
After the completion of row, software main interface can be all returned to, then other operations are performed by the menu setecting in main interface.
(3) basic parameter input
" calculating parameter sets (E) " in main interface is clicked, drop-down menu occurs, selection " calculates type and sets (L) ", i.e.,
The calculating type selection interface shown in Fig. 2 .4 can be jumped to, according to technique needs, selection " forward direction preheating ", " forward and reverse preheating "
(reverse preheating is considered as to the special case of forward and reverse preheating, its positive preheating time is zero) or " in-service low solidifying oil-piping changes defeated Gao Ning
Oil ".If need to carry out pipeline restarts safety evaluation, " carry out safety evaluatio " check box is chosen, and combines actual condition, is selected
Select " constant flow is restarted ", " constant pressure is restarted " or " considering that pump characteristic curve is restarted ", click OK.Now, calculate
Type selection interface will be hidden, while return to software main interface.
" calculating parameter sets (E) " in main interface is clicked, drop-down menu, selection " basic parameter sets (B) ", bullet occurs
Go out the interface as shown in Fig. 2 .5, as requested input station number.Wherein, pumping plant number, heat stations number and heated pump station number are required to individually defeated
Enter, and think that the terminal under single mode of movement is not belonging to the station of any type.Software is by according to calculating type selecting
As a result, selectively show or hide " reverse pumping ", " stopping transportation " label and text box.Software will provide the suggestion of material calculation
Value, the value can be also adjusted according to actual condition.After above- mentioned information inputs, click OK, complete basic parameter and set
Put, interface will jump back to software main interface.
Newly-built buried heated pipeline open defeated process or in-service low solidifying oil-piping changes the defeated high handoff procedure for coagulating oil and will all related to
And the sequentially-fed problem to two media (pumped (conveying) medium, pre- thermal medium) in pipe, it is therefore desirable to the thing of each medium
Property is inputted respectively." calculating parameter sets (E) " in main interface is clicked, drop-down menu occurs, selects " pipe flow medium parameter
Set (O) ", eject the interface as shown in Fig. 2 .6.For the convenience of the user, the physical property of the conventional oil product in part is solidificated in software by software
In, " selecting existing medium " is clicked during calling, and is selected from Media Lists；Not carrying out the oil product of parameter solidification can pass through
" oil quality characteristic fitting ", oil product specific heat, consistency coefficient and rheological behavior index are fitted according to experimental data, and are cured to
In software, directly it can be chosen when reusing from " selecting existing medium ".After selection, click on " application " and " true
It is fixed " exit interface parameter setting.Complete basic parameter to set, interface will jump back to software main interface.
, can be to each by clicking in main interface " parameter setting (D) between standing " in " calculating parameter sets (E) " drop-down menu
Soils physical parameters, ambient parameter and pipe parameter between individual station are configured (as shown in Fig. 2 .7).Software will be according to " basic
Number between the pumping plant number, heat stations number and the heated pump station number Auto-matching that are inputted in parameter setting " are outbound.Carrying out parameter input
When, between a certain station in " list between standing " need to be chosen first, the type of inception point between the station is then selected, sequentially inputs soil thing
Property parameter, ambient parameter and pipe parameter.Change defeated high solidifying oil if pipeline is in-service low solidifying oil-piping, and need to consider bitumen layer and
" considering bitumen layer and wax deposition layer " check box during wax deposition layer, is chosen, inputs relevant parameter.In addition, each physical quantity should be scaled to it is soft
Listed unit in part interface text.After the completion of being inputted between single station, " application " button should be clicked on, then between station in list
Select to be inputted between other stations, after input finishes between all stations, click on " it is determined that " parameter setting interface between station is exited, return to
Software main interface.
(4) Work condition analogue
Calculate needed for parameters input finish and confirm it is errorless after, click on " numerical simulation (V) " drop-down menu in
" starting to calculate (C) ", software calculates the Fortran programs of kernel by calling, to Soil Temperature Field along the line, medium temperature and frictional resistance
Calculated.After calculating terminates, by display zero-computing time, end time and program runtime.
(5) result of calculation output and graphic software platform
After calculating terminates, software will can be situated between in the medium temperature distribution along some predetermined time pipelines, specified location pipe
Matter temperature changes with time, specified location pipeline soil monitoring point temperature changes with time and some specified cross-sections
Soil Temperature Field automatically saves can be as needed using Origin softwares or the softwares of Tecplot 9.0 to it for DAT files, user
It is patterned display and subsequent treatment.In addition, this software also the partial functions of the softwares of Tecplot 9.0 reproduce with
Solidification.
" oil temperature change curve (T) along the line " clicked in " numerical simulation (V) " drop-down menu can be opened shown in Fig. 2 .8
The display interface of medium temperature distribution along the line.Can be chosen according to the content of required display " just defeated at the end of along oil temperature distribution ",
" oil temperature distribution along at the end of reverse pumping ", " oil temperature distribution along at the end of stopping transportation " or " oil temperature distribution along at the end of restarting "
One or more of check box, medium temperature along corresponding can be drawn out by clicking " display ".Clicking on " removing " can remove
The rendered all figures of Drawing zone, click on " exiting " can exit along medium temperature distribution display interface.
Fig. 2 .9 show pipeline section Soil Temperature Field display interface, by clicking in " numerical simulation (V) " drop-down menu
" Soil Temperature Field (A) " interface can be entered.First according to the content of required display, left side " grid ", " isothermal are chosen
One or more of line " or " shimming " check box, click the pipeline soil moisture of " display " exportable specified location
Distribution, the rendered all figures of Drawing zone can be removed by clicking on " removing ", and clicking on " exiting " can exit conduit section soil temperature
Spend field display interface.
Above-mentioned software is done below and verified：
The real data during Niger A Jiademu crude oil pipelines engineering is gone into operation is chosen herein to institute's making software
Accuracy is verified with applicability.
Xia Mian Dui A Jiademu crude oil pipeline operation overviews, which are done, to be introduced：
Niger A Jiademu crude oil pipelines design throughput is 100 × 104t/a, design pressure 10MPa, total track length
About 462.5km, caliber 323.9mm, the selection of pipe API 5L X52 HFW steel pipes, using buried-pipe laying, the outer anti-corrosion of pipeline is adopted
With high temperature modification 3PE (3 strata ethene), highest out-station temperature is no more than 70 DEG C.
The pipeline of table 3.1 and ambient parameter
Soil thermal conductivity along the pipeline of table 3.2
The crude oil basic physical properties parameter of table 3.3
The in-pipe inspection robot scheme of table 3.4
Pipeline using a pump on earth, heated transportation technique.If Goumeri initial stations, Tianjin Dare terminal and 5 intermediate heating stations
(2#, 4# band pigging function), 6 manual block valve for pipeline, 7 cathodic protection stations (all being built jointly with yard).Initial station be located at Ah
The central processing station (CPF) in Judd's nurse oil field, terminal are located at Tianjin Dare refinery southern side.
Total institute is planned to CNPC《The Niger's one phase in-pipe inspection robot solution process calculated description》, CZL co-design bodies《Buddhist nun
Er A Judd's nurse crude oil pipeline engineering Preliminary designs》And after the technological parameter being related in document is collected, arranged, it can obtain
Soil thermal conductivity along to the pipeline as shown in table 3.1 to table 3.4 and ambient parameter, pipeline, crude oil basic physical properties parameter and
In-pipe inspection robot scheme, and as calculating parameter, the first round is forward and reverse during being gone into operation to Niger's A Jiademu crude oil pipelines
Preheating carries out numerical simulation calculation, and result of calculation and measurement data are contrasted, so as to test the software worked out
Card.
The contrast of 3.3 result of calculations and measurement data
Using establishment《Crude oil pipeline preheats operation thermodynamic computing software》, Niger A Jiademu described herein above is former
Real data during oil-piping engineering is gone into operation is calculating parameter, can obtain positive preheating and reversely preheating finish time pipe
Oil temperature distribution along road.Wherein, each station enter the station locate oil temperature calculated value and measured value to such as shown in table 3.5.It can see
Go out, the maximum deviation of calculated value and measured value is 3.5 DEG C, and average deviation is 1.52 DEG C, considers the inclined of parameters measurement
Difference and requirement of engineering precision, it is believed that the calculating deviation of software is in the range of engineering permission.
The inlet temperature calculated value of table 3.5 contrasts with measured value
Forward direction preheating and the oil temperature reversely preheated along finish time pipeline are distributed as shown in Fig. 2 .10 and Fig. 2 .11, from figure
In as can be seen that due to when newly-built buried heated pipeline is gone into operation pipeline soil be nature ground temperature, the outbound temperature drop afterwards of deep fat is fast
Rate is larger, and oil head is often just to be down to ground temperature before entering the station；With the gradual accumulation of heat of the soil of oil stream upstream, place of being entered the station between each station
Oil temperature starts to gradually rise.After reverse warm starts, the cold oil of second half section will be by deep fat head opposite direction between former stand
Promote, but because its temperature difference between soil is smaller, temperature drop amplitude is also smaller.If cold oil is pushed to front half section between former station,
It is possible to absorb heat from soil, will be unable to play a part of preheating soil.Therefore, should be by imitative during Practical Project is gone into operation
It is true to calculate to draw rational positive preheating time and reverse preheating time.
Fig. 2 .12 give the underground temperature field of positive preheating and reversely preheating finish time pipeline starting point and end point, right
Than (b) and (d) as can be seen that during positive preheating, because preheating time is shorter, crude oil inlet temperature access expansion ground temperature, pipe
Road end point oil stream is less to the heat of surrounding soil transmission, and soil thermal storage amount is also smaller, pre-heat effect unobvious；Reversely preheating
When, because pipeline end point is now changed into exit, crude oil temperature is higher, and oil stream is more to surrounding soil liberated heat, soil
Amount of stored heat is larger, and pre-heat effect is obvious.Although contrast (a) and (c) as can be seen that reversely preheating when pipeline start position be changed into
Exit, inlet temperature constantly reduce, but because reverse preheating time is shorter, the oil stream temperature for reaching pipeline starting point is still notable
Higher than the soil moisture, oil stream still transmits heat to surrounding soil so that soil thermal storage amount increases.If reverse preheating time compared with
Long, the cold oil of second half section is pushed to front half section between former station between original station, it is likely that is absorbed heat from soil, causes pipeline accumulation of heat on the contrary
Amount reduces.
In summary：Above-mentioned technical proposal pair《Crude oil pipeline preheats operation thermodynamic computing software》Major function, part
Development process and application method are described, and choose the reality during Niger A Jiademu crude oil pipelines engineering is gone into operation
Data are verified to the accuracy of institute's making software with applicability.As a result show, software calculated value and field measurement value
Maximum deviation is 3.5 DEG C, and average deviation is 1.52 DEG C, after the deviation and requirement of engineering precision that consider each term coefficient measurement,
Think the calculating deviation of software in the range of engineering permission.Meanwhile found during the analysis to verifying example, technique ginseng
Several selections will significantly affect pre-heat effect.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (1)
1. a kind of crude oil pipeline preheats operation thermal procession emulation mode, it is characterised in that comprises the following steps：
Preheating method selection and safety evaluatio are configured；
Input pipe parameter, medium and soil physical factors between each station；
Import and calculate grid；
Calculating parameter initialize and utilize Finite Volume Method for Air and finite difference calculus calculate Soil Temperature Field, computer tube stream and soil it
Between heat exchange amount, thermodynamic features collimation method solve pipe flow medium relevant parameter；Obtain temperature, the pressure of the latter node of pipeline section；
Determine each node operational factor along pipeline；
Preheating safety evaluatio simultaneously exports to result；
Also comprise the following steps：
Stopping transportation initializes；
Areas of dielectric mesh generation in pipe；
Judge that boundary position whether there is free convection；
If so, equivalent heat conductivity is then calculated, and to medium temperature in pipe and soil moisture couple solution；It is if it is not, then directly right
Medium temperature and soil moisture couple solution in pipe；
Shutdown time is judged, and exports the result of calculation of stopping transportation；
Also comprise the following steps：
Restart safety evaluation initialization；
Mesh generation is carried out to medium mobile grid in pipe and carries out water force；
Mesh generation is carried out to pipeline and its surrounding soil fixed mesh and carries out thermodynamic computing；
Determine parameter interpolation between grid；
Each node operational factor is determined, is judged restarting the time, and exports the result of calculation restarted.
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| CN103136701A (en) * | 2011-11-25 | 2013-06-05 | 中国石油天然气股份有限公司 | Method for quantitatively evaluating pipe condensation probability of crude oil pipeline |
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| 冷热原油交替输送停输再启动研究;宇波等;《油气储运》;20091130;第28卷(第11期);第4-16页 * |
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