CN111156419A - Variable speed scheduling method and system for long-distance pipeline crude oil mixed transportation - Google Patents
Variable speed scheduling method and system for long-distance pipeline crude oil mixed transportation Download PDFInfo
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- CN111156419A CN111156419A CN202010013905.8A CN202010013905A CN111156419A CN 111156419 A CN111156419 A CN 111156419A CN 202010013905 A CN202010013905 A CN 202010013905A CN 111156419 A CN111156419 A CN 111156419A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
Abstract
The invention discloses a variable speed scheduling method for crude oil mixed transportation of a long transportation pipeline, which aims at the problems of low efficiency, long oil transportation time delay of the long transportation pipeline and incapability of using the originally-formulated scheduling. Compared with a common mixed integer programming method, the method has the advantages of small calculation scale, high solving speed, low non-solution probability and less occupied calculation resources. Meanwhile, the method solves the problem that the original scheduling production scheme is unavailable after the oil transportation speed is changed under the condition of a long oil transportation pipeline in the oil transportation process. The method improves the production efficiency of enterprises, reduces the loss of the enterprises and improves the economic benefit.
Description
Technical Field
The invention relates to the field of production scheduling of refining and chemical enterprises, in particular to a variable speed scheduling method under the condition of a long-distance pipeline, and specifically relates to a variable speed scheduling method for crude oil mixed transportation of the long-distance pipeline.
Background
At present, in daily production of refining enterprises, scheduling and scheduling work is often completed manually, and an optimal scheduling scheme is difficult to seek under the condition of considering all rule limitations, so people often seek the optimal scheduling scheme by using a mixed integer planning method in combination with a solver, but the mixed integer planning method is large in calculation scale, consumes 2-3 days frequently, and has the condition of no solution in a large probability. Meanwhile, when a long oil transportation pipeline with long length exists in the oil transportation process, the oil transportation is restricted by the fixed-speed oil transportation, so that the original oil transportation scheme cannot be used when the production flow rate of the atmospheric and vacuum distillation unit is changed, the actual oil receiving and paying condition of the storage tank in a factory and the oil transportation speed of the long oil transportation pipeline in a pre-production scheduling scheme need to be changed to adapt to the actual condition. Because the scheduling scheme cannot adapt to the variable oil transportation speed of the long transportation pipeline, the situation that the existing scheduling scheme is unavailable often occurs in practical application.
Disclosure of Invention
The invention provides a variable speed scheduling method for crude oil mixed transportation of a long transportation pipeline aiming at the problems in the background art, and an improved regular reasoning scheduling method is adopted, so that the defects of manual scheduling and production scheduling scheme formulation are overcome, and the variable speed scheduling method is self-adaptive to the oil transportation speed change condition in the oil transportation process of the long transportation pipeline. The method has the advantages that the scheduling and production scheduling are carried out for about 10-20 seconds once, the situation of no solution rarely occurs, the calculation efficiency and the solving reliability of a computer in the process of scheduling and production scheduling are improved, and the efficiency and the robustness of the scheduling and production scheduling scheme in the long-distance pipeline oil transportation process are improved.
The method comprises the following steps:
1) introducing human-machine interface unit, reading atmospheric pressure and vacuum pressureThe processing scheme of the device can select an experience scheme and an optimization scheme, and the production scheduling time point t is started1；
2) Introducing a process configuration management unit to obtain tank area configurations at two ends of the long-distance pipeline, wherein the tank area configurations comprise: tank farm name, standing time TSTSafe storage capacity C of tank area in factorySafe；
3) Obtaining a tank configuration, the tank configuration comprising: total capacity C of No. i storage tank in tank area in front of long-distance pipeline or in tank area in factory after long-distance pipelineT,B,iStock of used CU,iAvailable inventory CA,iMaintenance state MiTEM of insulating tank propertiesiThe storage tank receives and pays the oil state;
4) obtaining a long-distance pipeline configuration, wherein the pipeline configuration comprises: capacity of long-distance pipeline CTName of oil type stored in long-distance pipeline, and n oil type occupying long-distance pipeline capacity CU,nN is 1,2, q is the number of the oil type nearest to the tank area in the factory, and the oil conveying flow speed V of a single centrifugal pumpTThe number k of working centrifugal pumps;
5) obtaining an atmospheric and vacuum configuration, wherein the atmospheric and vacuum configuration comprises: working amount CPProcess flow velocity VPSupplying the number l of the atmospheric and vacuum storage tank, processing the oil type x, and predicting the completion time t of the current processing2；
6) Introducing a regular reasoning type scheduling unit, generating a long-distance pipeline crude oil scheduling and scheduling scheme according to the tank area configuration, the storage tank configuration, the long-distance pipeline configuration and the atmospheric and vacuum configuration, updating configuration data in a process configuration management unit, wherein the configuration data comprises four links of oil supply to the storage tank, oil collection to the pipeline, oil supply to the pipeline and oil receiving from the tank area before the long-distance pipeline, the storage tank with a true repairing state M in all the links is not selected, and the reasoning logics in all the links are as follows:
a. oil is loaded in a storage tank:
step one, judging whether the long-distance pipeline is a front tank area or a rear in-plant tank area, if the long-distance pipeline is the front tank area, turning to step two, and if not, turning to step five;
step two, the oil type being processed under the normal and reduced pressure is known to be x through the normal and reduced pressure configuration, a storage tank with the oil type being x is searched in all storage tanks in a tank area in front of the long-distance pipeline, if a storage tank with the oil type being consistent is found, the oil-loading storage tank is selected, the step four is carried out, and if the oil type being consistent is not found, the step three is carried out;
step three, searching all storage tanks p which can be blended into oil seeds x according to a processing scheme library configured by the system in the front tank area of the long-distance pipeline according to a blending proportion k1,p2,...,pjJ is the total number of the selected storage tanks, if the storage tanks meeting the conditions cannot be found, the oil is delivered to the pipeline, otherwise, the used stock C in the storage tank combination meeting the conditions is selectedU,iCombining the minimum storage tanks and turning to the step four;
recording the selected storage tank or storage tank combination information, if the tank area in the current batch of plants is not produced, switching to the fifth step, otherwise, switching to a pipeline oil receiving link;
step five, all T in the tank area in the factorySTSearching for a storage tank with oil species consistent with the oil species x being processed under normal and reduced pressure in the storage tanks exceeding the basic process requirements, and selecting the standing time T if the storage tanks are consistent with a plurality of storage tanksSTThe longest storage tank; the selected storage tank is used for supplying oil to the atmospheric and vacuum distillation unit for production, and the oil supply time period t is calculated2～t2+CU, i, in-plant/VPIf the front tank area of the long-distance pipeline of the current batch is not discharged, the step II is switched, otherwise, the oil is switched to a pipeline oil receiving link;
b. collecting oil by a pipeline:
step one, judging whether to mix and transfer, if the previously selected oil-off storage tanks are two or more than two, then performing a mixing and transferring step two, otherwise, performing a transferring step three;
step two, the crude oil blending proportion in the processing scheme of the atmospheric and vacuum distillation unit is adjusted, and the oil-loading speed of the oil-loading storage tank is the pipe transmission speed kVTX crude oil blending ratio f, its transfer time period is t1～t1+CU, i, before pipeline/kfiVTI is the number of the storage tanks in the front tank area of the pipeline which are used up first when rotating at the speed according to the blending proportion, and the step four is carried out;
step three, the oil supply speed of the oil supply storage tank is the pipe transmission speed kVTThe transmission time period is as follows:
t1～t1+Cu, i, before pipeline/kVTI is the number of the selected storage tank, and the step four is carried out;
recording the oil receiving time period of the pipeline in the current batch, and taking the oil storage type of the newly added pipeline and the corresponding capacity as the pipeline transmission speed kVTX duration of transfusion TrWherein T isrThe length of the oil receiving time period is obtained by calculating the difference of the time points at the beginning and the end of the time period, and the oil is supplied by a pipeline;
c. oil loading of pipelines:
step one, according to the configuration of the long-distance pipeline, the information of the oil section closest to the in-plant tank area, namely the q-th oil type occupying the capacity C of the long-distance pipelineU,qJudging whether storage tanks with consistent oil types exist in the in-plant tank area except the storage tank which is being charged with oil, if so, turning to the step two, otherwise, turning to the step three;
step two, selecting storage tanks with consistent oil types to be responsible for oil collection according to the current pipe transmission speed kVTCalculating the time period of transmission as t1～t1+CU,q/kVTStock of newly used storage tanks CU, i, in-plant'＝CU, i, in-plant+CU,qJudging whether the stock exceeds the limit of the storage tank capacity, if so, carrying the oil quantity C exceeding the limit of the storage tank capacityoverloadTurning to the step three, otherwise, turning to a link of selecting an oil receiving storage tank;
step three, selecting an empty tank to receive oil in the tank area in the plant, if no empty tank exists in the plant, stopping transmission and calculating, and if the oil quantity to be received is C ═ CoverloadThen, the transmission time period is calculated as:
t1+(CU,q-Coverload)/kVT～t1+(CU,q-Coverload)/kVT+C/kVT，
if the oil quantity to be received is C ═ CU,qThen the transmission time period is calculated as t1～t1+C/kVTStock of newly used storage tanks CU, i, in-plant'-' C, stock C for newly using storage tankU, i, in-plant' -C, receiving an oil incoming link in a tank area before transferring the long conveying pipeline;
d. the long-distance pipeline front tank field receives oil:
step one, judging whether the incoming oil is a heat-preservation oil type, if so, turning to step two, and otherwise, turning to step three;
step two, TEM according to the property of the heat preservation tankiRemoving the non-heat-preservation tank from the storage tank alternative library, and turning to the third step;
step three, searching storage tanks with oil types consistent with the oil types of the incoming oil in all the alternative storage tanks, if the storage tanks are found, turning to the step five, and otherwise, turning to the step four;
step four, selecting an empty tank from the storage tank alternative library at will to be responsible for oil collection and storage tank capacity information updating, ending the circulation and transferring the next circulation of the storage tank oil supply link;
step five, selecting a storage tank with the largest available storage capacity from the storage tank alternative libraries, updating the storage capacity information of the storage tank after receiving the oil, judging whether the updated storage capacity exceeds the limit, if not, needing no additional operation, if so, putting the part which exceeds the limit into all storage tanks with the smallest available storage capacity which can be stored in the alternative libraries, and updating the storage tank storage capacity information; if the production period is not finished, ending the circulation and transferring the oil supply link of the storage tank of the next circulation, otherwise arranging the tank area and the pipeline in the forward direction according to the time axis to receive and discharge the oil information and outputting the oil information;
the rule reasoning type scheduling unit comprises the following selection rules of the oil tank for charging and discharging:
a. if the mixed transportation condition exists during oil transportation, the mixed transportation of the crude oil should meet the blending proportion of the processing scheme;
b. the oil storage capacity of the storage tank reaches the upper capacity limit according to the standing time T set by the userSTStanding for at least TST；
c. Because the atmospheric and vacuum distillation unit in the plant can not stop supplying, the production accident is avoided, the tank area of each atmospheric and vacuum distillation unit in the plant is not allowed to be empty, namely, the tank area of each atmospheric and vacuum distillation unit is provided with at least one storage tank for supplying oil;
d. the oil for atmospheric and vacuum pressure in the plant complies with the principle of first-in first-out;
e. the heat-preservation oil seeds must be stored in a heat-preservation tank, and all the non-heat-preservation oil seeds can be stored (including the heat-preservation tank);
f. the oil for the atmospheric and vacuum distillation unit is preferentially selected from the oil type storage tank for oil recovery in the same processing scheme in the in-plant tank area, and the oil for the atmospheric and vacuum distillation unit preferentially uses the oil type in the same processing scheme, so that the problems of cost for switching the processing schemes and reduction of production efficiency are solved;
g. the storage tank with a true overhaul state cannot be used;
h. the storage tank with less storage capacity is preferentially selected to pay oil so as to empty the tank as much as possible for storing new oil;
i. the oil seeds of different processing schemes can not be collected in the same storage tank.
7) Introducing a scheduling scheme management unit, determining the number of centrifugal pumps required to be used according to actual production requirements and process requirements, if the number of the centrifugal pumps required to be used is different from a previous set value and a speed change condition occurs, continuing the following steps, otherwise, keeping the original scheduling scheme and generating a long-distance pipeline crude oil scheduling scheme report form by the scheduling scheme management unit;
8) introducing an adaptive variable speed scheduling unit, and adjusting the pipe conveying speed by adjusting the number k of working pumps, wherein the adaptive variable speed scheduling unit specifically comprises the following operation logics:
step one, the default transmission speed is VTJudging whether the total storage capacity of the atmospheric and vacuum tank area in the plant is lower than the safe storage capacity CSafeIf yes, turning to the step two, otherwise, turning to the step three;
step two, adjusting the transfer speed to the maximum transfer speed VTmaxCalling a regular reasoning type scheduling unit to generate a new crude oil scheduling and scheduling scheme of the long-distance pipeline to replace the original crude oil scheduling and scheduling scheme of the long-distance pipeline;
step three, judging whether the condition of the output interruption or the condition of the change of the normal and reduced pressure processing speed occurs under the prior scheduling scheme, if so, adjusting the transmission speed to the minimum transmission speed VTminCalling a regular reasoning type scheduling unit to generate a new crude oil scheduling and scheduling scheme of the long-distance pipeline to replace the original crude oil scheduling and scheduling scheme of the long-distance pipeline; if not, turning to the fourth step;
step four, keeping the default transmission speed as VTThe original crude oil scheduling and scheduling scheme of the long-distance pipeline is kept;
the invention discloses a variable speed scheduling production scheduling system for crude oil mixed transportation of a long transportation pipeline, which is characterized by comprising the following components:
1) a human-machine interface unit: the system is used for reading the processing scheme of the atmospheric and vacuum device and outputting a visual scheduling scheme;
2) a process configuration management unit: the system is used for acquiring tank area configuration, storage tank configuration, long-distance pipeline configuration and atmospheric and vacuum configuration at two ends of a long-distance pipeline;
3) a rule inference type scheduling unit: integrating a series of receiving and paying oil tank selection rule bases, respectively searching for optimal storage tanks in a front tank area of the long-distance pipeline and an internal tank area of a rear factory of the long-distance pipeline according to each rule of the rule bases, and generating a scheduling and scheduling scheme;
4) a scheduling scheme management unit: after a user issues an instruction through a human-computer interface, generating a specific report form of a crude oil scheduling and scheduling scheme of the long-distance pipeline;
5) the self-adaptive variable speed scheduling unit: and adaptively adjusting the transmission speed of the long transmission pipeline according to the actual condition and calling a regular inference type scheduling unit to regenerate a scheduling and production scheduling scheme.
In the invention, the other links except the long-distance pipeline scheduling of the crude oil scheduling already provide feasible scheduling schemes. The process equipment comprises a storage tank, a switch valve, a centrifugal pump and a flowmeter. The pipeline path length l is obtained by referring to engineering drawings, and l > -15 km. And the pipeline configuration, the atmospheric and vacuum configuration, the storage tank configuration and the tank area configuration are obtained by consulting the engineering drawing for calculation.
The invention has the beneficial effects that:
the invention discloses a variable speed scheduling method for crude oil mixed transportation of a long transportation pipeline, which aims at the problems of low efficiency of a traditional manual scheduling and production scheduling scheme in a long transportation pipeline mixed oil transportation process, high non-resolution rate and calculation inefficiency of a traditional mixed integer planning method for seeking an optimal scheduling scheme, long transportation pipeline oil transportation time delay and incapability of using the originally-formulated scheduling and production scheduling scheme during variable speed oil transportation according to actual production conditions. Compared with the traditional mixed integer programming method, the method has the advantages of small calculation scale, high solving speed, low non-solution probability and less occupied calculation resources. Compared with the traditional crude oil mixed transportation scheduling method for the long transportation pipeline, the method has the characteristics of stronger robustness and high efficiency, and the scheme can be used for automatically producing, scheduling and scheduling the production without manual intervention after the configuration of a user. The method has very important significance for improving the production efficiency of enterprises, ensuring the production safety, reducing the enterprise loss and improving the economic benefit.
Drawings
FIG. 1 is a flow chart of a long oil transportation pipeline oil transportation process of a certain oil refinery according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a variable speed scheduling and scheduling system for crude oil mixed transportation of a long transportation pipeline according to an embodiment of the present invention;
FIG. 3 is a flow chart of a scheduling method for crude oil mixed transportation in a long transportation pipeline according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating the operation of the adaptive variable speed scheduling unit according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the variable speed scheduling result of the crude oil mixed transportation of the long transportation pipeline according to the embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples. The implementation effect of the method in the variable speed scheduling process of the crude oil of the long-distance pipeline is illustrated by a specific operation flow. The present embodiment is implemented on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following examples.
Fig. 1 is a flow chart of a long oil pipeline oil transportation process of a certain oil refining enterprise, wherein due to the fact that the long oil pipeline crude oil mixed transportation process is complex, traditional manual scheduling is difficult to find an optimal crude oil mixed transportation scheduling scheme while considering process rules, and when the oil transportation speed changes, the original scheduling scheme is unavailable. The invention provides a variable speed scheduling method for crude oil mixed transportation of a long transportation pipeline, which solves the problems.
The system structure of the method is shown in fig. 2. The implementation steps are shown in fig. 3, and specifically are as follows:
1) the human-computer interface unit inputs the scheduling time interval of 2019-08-2906: 00 to 2019-09-1019: 00;
2) the man-machine interface unit inputs a planned oil supply and processing scheme, and the planned oil supply is as follows: 2019-08-2823: 00-2019-08-2923: 00 sand collection from GL 04: 45000m32019-08-2923: 00 to 2019-08-3007: 00 by GL02 Zeiss: 20745m32019-08-3007: 00 to 2019-08-3009: 00 by GL06 Zeiss: 7255m32019-08-3100: 00 to 2019-09-0106: 00M 104 from GL 05: 83973m32019-09-0115: 00-2019-09-0213: 00M 104 is collected from GL 01: 61578m309-0509: 00-2019-09-0213: 00 sand-collecting light by GL 01: in sand [36:35 ]]：84001m309-0809: 00 to 2019-09-0810: 00 prepared from GL06 sumas: 2586m309-0809: 00 to 2019-09-0810: 00 from GL04 to obtain M1-3002: 84000m3；
The empirical processing scheme is shown in table 1:
TABLE 1 existing processing protocols
3) And the process configuration management unit initializes the storage tank configuration, the tank area configuration, the pipeline configuration and the atmospheric and vacuum device configuration. There are 6 storage tanks in south side kitchen oil depot tank field: GL01, GL02, GL03, GL04, GL05, GL 06; the inner tank district of factory has two atmospheric and vacuum distillation plant production lines, and 1# atmospheric and vacuum distillation plant production line tank district has: the tank area of the production line of the No. G101, G103, G109, G110,2 atmospheric and vacuum distillation unit comprises: g107, G111, G112, G113, G114; the storage tanks which are not available in the overhaul are G102, G104, G107 and G108; the pipeline is a 163km long-distance pipeline of a south plant line; the specific configuration specifications are shown in table 2:
TABLE 2 storage tank and pipeline specifications
4) The process configuration management unit reads initial tank storage and management storage at the initial stage, and specific numerical values are shown in table 3:
TABLE 3 initial tank and vessel values
5) The process configuration management unit reads that the current processing flow rate of 1# atmospheric and vacuum pressure is 610t/h, the current processing flow rate of 3# atmospheric and vacuum pressure is 857t/h, and the oil transportation speed of the south plant line is 1750m3The front tank area of the long-distance pipeline is a south side stove tank area;
6) the regular reasoning type scheduling unit reads initial tank storage and pipe storage in the period, and reads the current processing flow rate and pipe storage;
7) and the regular reasoning type scheduling unit is used for carrying out oil supply operation on the storage tanks in the in-plant tank areas, searching the maximum available storage tanks which store oil types in the in-plant tank areas of the 1# and the 3# atmospheric and vacuum production lines and are consistent with the mixed oil types used in the atmospheric and vacuum production lines respectively, searching the maximum available storage tanks if the maximum available storage tanks are not consistent, adding first-in first-out in the searching process, namely, firstly carrying out oil supply production on the storage tanks which receive the oil early, and then searching the storage tank with the longest standing time in the searching result. Obtaining the selection of the optimal in-plant storage tank through the searching, and calculating the oil applying time period and the storage capacity change condition of the optimal in-plant storage tank according to the selection in scheduling and scheduling;
8) and the regular reasoning type scheduling unit is used for carrying out oil supply operation on the storage tanks of the oil depot of the south side stove, searching the maximum available storage tank with the oil type consistent with the mixed oil type used under normal and reduced pressure on the 1# or 3# production line in a search tank area in the oil depot of the south side stove, searching the maximum available storage tank if the maximum available storage tank is not consistent, and adding a first-in first-out principle in the searching process to carry out oil supply production on the storage tank which receives oil earlier. Obtaining the optimal south stove storage tank selection through the searching, and preferentially arranging the storage tank to empty in scheduling and scheduling;
8) the regular reasoning type scheduling unit is used for carrying out pipeline oil receiving operation, preferentially releasing the capacity of the storage tank of the optimal south stove, receiving the capacity by a pipeline, calculating starting and stopping time according to flow rate, storing a plan and updating information of a tank area and a pipeline;
9) the regular reasoning type scheduling unit is used for carrying out pipeline oil supply operation, searching a storage tank which is consistent with the oil type of the oil section closest to the pipeline in the plant from all available storage tanks in a tank area in the plant, selecting the storage tank to receive oil if the storage tank is consistent, calculating a transfer time period and a storage tank after transfer according to the current pipe transfer speed, selecting an empty storage tank to receive oil if the storage tank is not consistent, calculating the transfer time period and the storage tank after transfer according to the current pipe transfer speed, and continuing the step 10 if the empty storage tank cannot be found without any operation;
10) the regular reasoning type scheduling unit is used for carrying out oil receiving operation of the southern range, screening an available storage tank base according to whether the incoming oil is a heat-preservation oil, searching the maximum available storage tank in the available storage tank base, preferentially receiving the incoming oil by the storage tank, calculating start-stop time and storage plan according to the pipe transmission speed in the received incoming oil information, and updating the tank area information;
11) a self-adaptive variable speed scheduling unit, if the scheduling period is finished, continuing the step 12; and if the scheduling period is not finished, observing whether the condition that the factory internal storage capacity is lower than the safe storage capacity, the condition of the cut-off of the transportation and the condition of the change of the processing speed of the atmospheric and vacuum devices occur, if the abnormal condition occurs, adaptively adjusting the transportation speed of the pipe according to the work flow shown in fig. 4, specifically adjusting the transportation speed of the pipe by adjusting the number k of the working pumps, and returning to the step 6 after updating configuration, scheduling time interval, planning oil supply and processing schemes in order to adapt to the new oil transportation speed. If the abnormal condition does not occur, the original configuration is kept, and the tank storage and the management storage are updated. The scheduling time interval after the configuration updating operation is (total time interval-previous scheduling time interval), the configuration after the configuration updating is the configuration of a tank area, a pipeline and an atmospheric and vacuum after previous scheduling, all information is the predicted condition after the previous scheduling operation is finished, the scheduled oil coming information after the updating is to deduct the scheduled oil coming information of the previous scheduling operation to return to the step 6, and the scheduling operation of the next operation section is started;
12) the scheduling scheme management unit outputs scheduling results, and the scheduling results are presented in a gantt chart form through the human-computer interface unit, and in this embodiment, the scheduling results obtained by the method are shown in fig. 5. The mixed or single oil scheduling time arrangement of each oil storage tank and each long oil transmission pipeline can be clearly seen in the figure, the production scheduling result meets the process requirement, the production scheduling time does not conflict or intersect, and the material conservation and balance principle is followed.
Claims (8)
1. A variable speed scheduling method for crude oil mixed transportation of a long transportation pipeline is characterized by comprising the following steps:
1) introducing a human-computer interface unit, reading a processing scheme of the atmospheric and vacuum device, wherein the processing scheme is an experience scheme or an optimization scheme, and starting a production scheduling time point t1The system comprises oil type, oil quantity, transfer speed and oil coming information of time points;
2) introducing a process configuration management unit to obtain tank area configurations at two ends of the long-distance pipeline, wherein the tank area configurations comprise: tank farm name, standing time TSTSafe storage capacity C of tank area in factorySafe；
3) Obtaining a tank configuration, the tank configuration comprising: total capacity C of No. i storage tank in tank area in front of long-distance pipeline or in tank area in factory after long-distance pipelineT,B,iStock of used CU,iAvailable inventory CA,iMaintenance state MiTEM of insulating tank propertiesiThe storage tank receives and pays the oil state;
4) obtaining a long-distance pipeline configuration, the pipeline configuration comprising: capacity of long-distance pipeline CTName of oil type stored in long-distance pipeline, and n oil type occupying long-distance pipeline capacity CU,nN is 1,2, q is the number of the oil type nearest to the tank area in the factory, and the oil conveying flow speed V of a single centrifugal pumpTThe number k of working centrifugal pumps;
5) obtaining an atmospheric and vacuum configuration, wherein the atmospheric and vacuum configuration comprises: working amount CPProcess flow velocity VPSupplying the number l of the atmospheric and vacuum storage tank, processing the oil type x, and predicting the completion time t of the current processing2；
6) Introducing a regular reasoning type scheduling unit, generating a long-distance pipeline crude oil scheduling and scheduling scheme according to the tank area configuration, the storage tank configuration, the long-distance pipeline configuration and the atmospheric and vacuum configuration, updating configuration data in a process configuration management unit, wherein the configuration data comprises four links of oil supply to the storage tank, oil collection to the pipeline, oil supply to the pipeline and oil receiving from the tank area before the long-distance pipeline, the storage tank with a true repairing state M in all the links is not selected, and the reasoning logics in all the links are as follows:
a. oil is loaded in a storage tank:
step one, judging whether the long-distance pipeline is a front tank area or a rear in-plant tank area, if the long-distance pipeline is the front tank area, turning to step two, and if not, turning to step five;
step two, the oil type being processed under the normal and reduced pressure is known to be x through the normal and reduced pressure configuration, a storage tank with the oil type being x is searched in all storage tanks in a tank area in front of the long-distance pipeline, if a storage tank with the oil type being consistent is found, the oil-loading storage tank is selected, the step four is carried out, and if the oil type being consistent is not found, the step three is carried out;
step three, searching all storage tanks p which can be blended into oil seeds x according to a processing scheme library configured by the system in the front tank area of the long-distance pipeline according to a blending proportion k1,p2,...,pjJ is the total number of the selected storage tanks, if the storage tanks meeting the conditions cannot be found, the oil is delivered to the pipeline, otherwise, the used stock C in the storage tank combination meeting the conditions is selectedU,iCombining the minimum storage tanks and turning to the step four;
recording the selected storage tank or storage tank combination information, if the tank area in the current batch of plants is not produced, switching to the fifth step, otherwise, switching to a pipeline oil receiving link;
step five, all T in the tank area in the factorySTSearching for a storage tank with oil species consistent with the oil species x being processed under normal and reduced pressure in the storage tanks exceeding the basic process requirements, and selecting the standing time T if the storage tanks are consistent with a plurality of storage tanksSTThe longest storage tank; the selected storage tank is used for supplying oil to the atmospheric and vacuum distillation unit for production, and the oil supply time period t is calculated2～t2+CU, i, in-plant/VPIf the front tank area of the long-distance pipeline of the current batch is not discharged, the step II is switched, otherwise, the oil is switched to a pipeline oil receiving link;
b. collecting oil by a pipeline:
step one, judging whether to mix and transfer, if the previously selected oil-off storage tanks are two or more than two, then performing a mixing and transferring step two, otherwise, performing a transferring step three;
step two, the crude oil blending proportion in the processing scheme of the atmospheric and vacuum distillation unit is adjusted, and the oil-loading speed of the oil-loading storage tank is the pipe transmission speed kVTX crude oil blending ratio f, its transfer time period is t1～t1+CU, i, before pipeline/kfiVTI is the number of the storage tanks in the front tank area of the pipeline which are used up first when rotating at the speed according to the blending proportion, and the step four is carried out;
step three, the oil supply speed of the oil supply storage tank is the pipe transmission speed kVTThe transmission time period is as follows:
t1～t1+Cu, i, before pipeline/kVTI is the number of the selected storage tank, and the step four is carried out;
recording the oil receiving time period of the pipeline in the current batch, and taking the oil storage type of the newly added pipeline and the corresponding capacity as the pipeline transmission speed kVTX duration of transfusion TrWherein T isrThe length of the oil receiving time period is obtained by calculating the difference of the time points at the beginning and the end of the time period, and the oil is supplied by a pipeline;
c. oil loading of pipelines:
step one, according to the configuration of the long-distance pipeline, the information of the oil section closest to the in-plant tank area, namely the q-th oil type occupying the capacity C of the long-distance pipelineU,qJudging whether storage tanks with consistent oil types exist in the in-plant tank area except the storage tank which is being charged with oil, if so, turning to the step two, otherwise, turning to the step three;
step two, selecting storage tanks with consistent oil types to be responsible for oil collection according to the current pipe transmission speed kVTCalculating the time period of transmission as t1～t1+CU,q/kVTStock of newly used storage tanks CU, i, in-plant'＝CU, i, in-plant+CU,qJudging whether the stock exceeds the limit of the storage tank capacity, if so, carrying the oil quantity C exceeding the limit of the storage tank capacityoverloadTurning to the step three, otherwise, turning to a link of selecting an oil receiving storage tank;
step three, selecting an empty tank to collect oil in the tank area in the plant at will, and cutting off the tank if no empty tank exists in the plantIf the oil quantity to be received is C ═ CoverloadThen, the transmission time period is calculated as:
t1+(CU,q-Coverload)/kVT～t1+(CU,q-Coverload)/kVT+C/kVT，
if the oil quantity to be received is C ═ CU,qThen the transmission time period is calculated as t1～t1+C/kVTStock of newly used storage tanks CU, i, in-plant'-' C, stock C for newly using storage tankU, i, in-plant' -C, receiving an oil incoming link in a tank area before transferring the long conveying pipeline;
d. the long-distance pipeline front tank field receives oil:
step one, judging whether the incoming oil is a heat-preservation oil type, if so, turning to step two, and otherwise, turning to step three;
step two, TEM according to the property of the heat preservation tankiRemoving the non-heat-preservation tank from the storage tank alternative library, and turning to the third step;
step three, searching storage tanks with oil types consistent with the oil types of the incoming oil in all the alternative storage tanks, if the storage tanks are found, turning to the step five, and otherwise, turning to the step four;
step four, selecting an empty tank from the storage tank alternative library at will to be responsible for oil collection and storage tank capacity information updating, ending the circulation and transferring the next circulation of the storage tank oil supply link;
step five, selecting a storage tank with the largest available storage capacity from the storage tank alternative libraries, updating the storage capacity information of the storage tank after receiving the oil, judging whether the updated storage capacity exceeds the limit, if not, needing no additional operation, if so, putting the part which exceeds the limit into all storage tanks with the smallest available storage capacity which can be stored in the alternative libraries, and updating the storage tank storage capacity information; if the production period is not finished, ending the circulation and transferring the oil supply link of the storage tank of the next circulation, otherwise arranging the tank area and the pipeline in the forward direction according to the time axis to receive and discharge the oil information and outputting the oil information;
7) introducing a scheduling scheme management unit, determining the number of centrifugal pumps required to be used according to actual production requirements and process requirements, if the number of the centrifugal pumps required to be used is different from a previous set value and a speed change condition occurs, continuing the following steps, otherwise, keeping the original scheduling scheme and generating a long-distance pipeline crude oil scheduling scheme report form by the scheduling scheme management unit;
8) introducing an adaptive variable speed scheduling unit, and adjusting the pipe conveying speed by adjusting the number k of working pumps, wherein the adaptive variable speed scheduling unit specifically comprises the following operation logics:
step one, the default transmission speed is VTJudging whether the total storage capacity of the atmospheric and vacuum tank area in the plant is lower than the safe storage capacity CSafeIf yes, turning to the step two, otherwise, turning to the step three;
step two, adjusting the transfer speed to the maximum transfer speed VTmaxCalling a regular reasoning type scheduling unit to generate a new crude oil scheduling and scheduling scheme of the long-distance pipeline to replace the original crude oil scheduling and scheduling scheme of the long-distance pipeline;
step three, judging whether the condition of the output interruption or the condition of the change of the normal and reduced pressure processing speed occurs under the prior scheduling scheme, if so, adjusting the transmission speed to the minimum transmission speed VTminCalling a regular reasoning type scheduling unit to generate a new crude oil scheduling and scheduling scheme of the long-distance pipeline to replace the original crude oil scheduling and scheduling scheme of the long-distance pipeline; if not, turning to the fourth step;
step four, keeping the default transmission speed as VTAnd the original crude oil scheduling and scheduling scheme of the long-distance pipeline is kept.
2. The variable speed scheduling method for the mixed transportation of crude oil through a long transportation pipeline according to claim 1, wherein the process equipment comprises a storage tank, a switch valve, a centrifugal pump and a flowmeter.
3. The method as claimed in claim 1, wherein the pipeline path length l is obtained by referring to engineering drawings, and l > is 15 km.
4. The variable speed scheduling method for the mixed transportation of crude oil through the long distance pipeline according to claim 1, wherein the pipeline configuration, the atmospheric and vacuum configuration, the storage tank configuration and the tank area configuration are obtained by calculation by referring to engineering drawings.
5. The method as claimed in claim 1, wherein the scheduling of crude oil is performed in a link other than the scheduling of the long transmission pipeline.
6. A variable speed scheduling system for mixed transportation of crude oil in a long transportation pipeline, which is used for realizing the variable speed scheduling method for mixed transportation of crude oil in a long transportation pipeline as claimed in any one of claims 1 to 5, and is characterized in that the system comprises:
1) a human-machine interface unit: the system is used for reading the processing scheme of the atmospheric and vacuum device and outputting a visual scheduling scheme;
2) a process configuration management unit: the system is used for acquiring tank area configuration, storage tank configuration, long-distance pipeline configuration and atmospheric and vacuum configuration at two ends of a long-distance pipeline;
3) a rule inference type scheduling unit: integrating a series of receiving and paying oil tank selection rule bases, respectively selecting optimal storage tanks in a front tank area of the long-distance pipeline and a rear in-plant tank area of the long-distance pipeline according to rules in the rule bases, and generating a scheduling and scheduling scheme;
4) a scheduling scheme management unit: after a user issues an instruction through a human-computer interface, generating a specific report form of a crude oil scheduling and scheduling scheme of the long-distance pipeline;
5) the self-adaptive variable speed scheduling unit: and adaptively adjusting the transmission speed of the long transmission pipeline according to the actual condition and calling a regular inference type scheduling unit to regenerate a scheduling and production scheduling scheme.
7. The system according to claim 6, wherein the regular inference type scheduling unit integrates a series of receiving and paying tank selection rule bases, which include the following rules:
a. if the mixed transportation condition exists during oil transportation, the mixed transportation of the crude oil should meet the blending proportion of the processing scheme;
b. the oil storage capacity of the storage tank reaches the upper capacity limit according to the standing time T set by the userSTStanding for at least TST；
c. Because the atmospheric and vacuum distillation unit in the plant can not stop supplying, the production accident is avoided, the tank area of each atmospheric and vacuum distillation unit in the plant is not allowed to be empty, namely, the tank area of each atmospheric and vacuum distillation unit is provided with at least one storage tank for supplying oil;
d. the oil for atmospheric and vacuum pressure in the plant complies with the principle of first-in first-out;
e. the heat-preservation oil seeds must be stored in a heat-preservation tank, and all the non-heat-preservation oil seeds can be stored;
f. the oil for the atmospheric and vacuum distillation unit is preferentially selected from the oil type storage tank for oil recovery in the same processing scheme in the in-plant tank area, and the oil for the atmospheric and vacuum distillation unit preferentially uses the oil type in the same processing scheme, so that the problems of cost for switching the processing schemes and reduction of production efficiency are solved;
g. the storage tank with a true overhaul state cannot be used;
h. the storage tank with less storage capacity is preferentially selected to pay oil so as to empty the tank as much as possible for storing new oil;
i. the oil seeds of different processing schemes can not be collected in the same storage tank.
8. The variable speed scheduling system for the mixed transportation of crude oil through a long transportation pipeline according to claim 6, wherein the adaptive variable speed scheduling unit can adaptively change the flow rate of the crude oil transportation to provide a reasonable scheduling production scheme under the condition of step variable speed realized by changing the number of the opened centrifugal pumps.
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