CN116362648B - Efficient liquefied natural gas transportation strategy making method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000003949 liquefied natural gas Substances 0.000 title abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000003345 natural gas Substances 0.000 claims abstract description 45
- 230000004888 barrier function Effects 0.000 claims abstract description 30
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Abstract
The invention belongs to the technical field of natural gas transportation, and particularly relates to a method for formulating a high-efficiency liquefied natural gas transportation strategy. The method specifically comprises the following steps: generating a road traffic network of a target area; marking necessary nodes for natural gas transportation in a road traffic network; marking barrier nodes for natural gas transportation in a road traffic network; generating all possible routes of natural gas transportation in a road traffic network based on the obstacle nodes and the necessary nodes, and recording; and taking the possible route with highest route efficiency as the final route of natural gas transportation based on the calculated route efficiency of each possible route. According to the invention, the barrier nodes and the necessary nodes in the road traffic network are analyzed to find the transportation route with highest efficiency, and finally the establishment of the transportation strategy is realized.
Description
Technical Field
The invention belongs to the technical field of natural gas transportation, and particularly relates to a method for formulating a high-efficiency liquefied natural gas transportation strategy.
Background
Natural gas transportation, one of the components of fossil energy transportation. The main form is pipeline transportation, and the construction of natural gas pipelines (including a line booster station and various stages of gas gathering stations) is one of main projects of natural gas development. Typical paths for overseas natural gas input are: in the export country, natural gas is transported to an export port through a pipeline and processed into liquefied natural gas in the port; the liquefied natural gas is transported to an import special dock of an input country through a special liquefied natural gas transport ship, is converted into gaseous natural gas through a conversion station built near the port, and is distributed to all users through pipelines.
In order to achieve an efficient design of the lng carrier network and reduce the risk of lng during transportation, urban traffic managers will regulate road segments in the road network near people-gathering locations, such as shopping squares, schools, residential areas, etc., by closing parts of road network segments to minimize adverse effects of lng carrier vehicle accidents. Although the method guarantees that urban residents are prevented from being influenced by the transportation accidents of the liquefied natural gas to a certain extent, the transportation efficiency of the operation company to the liquefied natural gas is influenced. This is because from the point of view of the carrier, the liquid natural gas distribution of the regulated part of the urban road section will have to cause the evasive detour of its transport vehicles in the part of the area, thus extending the travel time to the point of user demand and increasing the transport economy cost.
Therefore, the urban traffic road network is analyzed, the most economical and most efficient path is planned according to the analysis result, so that the cost of natural gas transportation is lower, and meanwhile, the inconvenience brought to residents by closing the road can be reduced.
Disclosure of Invention
The invention mainly aims to provide a method for formulating a high-efficiency liquefied natural gas transportation strategy, so that the intelligent formulation of the natural gas transportation strategy is realized, and the efficiency of natural gas transportation is improved.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the method for formulating the high-efficiency liquefied natural gas transportation strategy comprises the following steps:
step 1: generating a road traffic network of a target area;
step 2: marking necessary nodes for natural gas transportation in a road traffic network; the necessary nodes are defined as nodes through which transportation vehicles must pass in the process of transporting natural gas;
step 3: marking barrier nodes for natural gas transportation in a road traffic network; the obstacle nodes are defined as nodes which the transportation vehicle must avoid in the natural gas transportation process;
step 4: generating all possible routes of natural gas transportation in a road traffic network based on the obstacle nodes and the necessary nodes, and recording;
step 5: performing route efficiency evaluation on all the generated possible routes, and generating route efficiency of each possible route, wherein the route efficiency evaluation specifically comprises the following steps: projecting each possible route into a two-dimensional planar coordinate system, and translating from the starting point of the possible route by using a circumference area with the radius of the circumference area as an interval until the circumference area no longer covers any part of the possible route; recording in real time, during the translation of the circumferential region, the sub-efficiency of a portion of the possible routes covered by the circumferential region; calculating the total efficiency of each possible route based on all the sub-efficiencies as the route efficiency of the possible route;
step 6: and taking the possible route with highest route efficiency as the final route of natural gas transportation based on the calculated route efficiency of each possible route.
Preferably, in the step 1, the method for generating the road traffic network of the target area includes:
step 1.1: the abstract processing of the planar map of the target area specifically comprises the following steps: a crowd gathering place is defined and screened out in a plane map of a target area or a transportation station is stopped, a center of the crowd gathering place which is defined and screened out is calculated, a circular area is defined by taking the center as a circle center, and all places in the crowd gathering place are required to be wrapped in the circular area;
step 1.2: scaling a circular area defined by a crowd gathering place in a planar map of a target area until the area of all the circular areas in the target area is smaller than a set threshold value, recording the scaling at the moment to obtain a road traffic network of the target area, and marking the crowd gathering place and a transportation stop in the obtained road traffic network of the target area.
Preferably, the value range of the scaling ratio satisfies the following conditions:wherein pix is an average pixel area value of the width of each road in the planar map of the target area; DIS is the pixel area value of the largest circular area among the delineated circular areas; p is the scaling.
Preferably, in the step 2: the method for marking the necessary nodes for natural gas transportation in the road traffic network comprises the following steps: and taking the transport transit stop marked in the road traffic network as a transit-passing node.
Preferably, the method for marking the obstacle node of natural gas transportation in the road traffic network in the step 3 includes: and taking the crowd gathering places marked in the road traffic network as obstacle nodes.
Preferably, the method for generating all possible routes of natural gas transportation in the road traffic network based on the obstacle nodes and the necessary nodes in the step 4 includes:
step 4.1: connecting all necessary nodes in the road traffic network to generate transport necessary nodes;
step 4.2: connecting all barrier nodes in a road traffic network to generate a transportation barrier line;
step 4.3: if the transport necessary warp and the transport barrier line are crossed, executing the step 4.4; if the transport necessary warp and the transport barrier line are overlapped, executing the step 4.5; if the transport necessary warp and the transport barrier line are mutually disjoint and are not coincident, directly executing the step 4.6;
step 4.4: setting an obstacle radius by taking each obstacle node in the transportation obstacle line as a circle center, if the crossing part of the transportation necessary warp and the transportation obstacle line is within the obstacle radius, moving the crossing part in the transportation necessary warp until the crossing part is outside the obstacle radius, and then executing the step 4.6;
step 4.5: moving the part of the transport necessary warp and the transport barrier line until the transport necessary warp and the transport barrier line do not overlap, and then executing the step 4.6;
step 4.6: and connecting the part of the road traffic network except the transportation barrier line and the transportation necessary line with the transportation necessary line to obtain all possible routes.
Preferably, in step 5, route efficiency evaluation is performed on all the generated possible routes, and before route efficiency of each possible route is generated, part of the transport necessary warp in the possible routes is removed, and then the removed possible routes are connected.
Preferably, the method for recording the sub-efficiency of a part of the possible routes covered by the circumferential area in real time during the translation of the circumferential area in step 5 comprises: the sub-efficiency is calculated using the following formula: f= [1.8×n]*[0.5*|lg(L)|]*[|1.2*sinθ 1 *sinΔ 2 *…*sinθ n |]The method comprises the steps of carrying out a first treatment on the surface of the Where F is the sub-efficiency, N is the number of turning points of a part of the covered possible route, L is the length of a part of the covered possible route, θ n The straight line connecting adjacent turning points that are part of the covered possible route forms an angle with the horizontal plane.
Preferably, the method for calculating the total efficiency of each possible route as the route efficiency of the possible route in step 5 based on all the sub-efficiencies includes:
where H is the route efficiency of the possible routes; a, a n Normalized values of angles of straight lines connecting adjacent turning points of a portion of a possible route covered by the circumferential area with a horizontal plane.
Preferably, said a n The calculation of (2) uses the following formula:
the method for formulating the high-efficiency liquefied natural gas transportation strategy has the following beneficial effects: the invention converts the plan view of the target area into the road traffic network, adopts a scaling mode in the conversion process, abstracts the crowd gathering place and transportation by a site to a point, reduces the complexity for the subsequent processing and improves the efficiency; in the process of formulating the strategy, the highest-efficiency mode is used, the strategy is automatically formulated based on the barrier node and the necessary nodes, so that the transportation efficiency is improved, the transportation cost of the natural gas is reduced, and the intelligence of strategy formulation is further improved.
Drawings
FIG. 1 is a schematic flow chart of a method for establishing a high-efficiency liquefied natural gas transportation strategy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of obstacle nodes in a road traffic network in a method for formulating a high-efficiency LNG transportation strategy according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating definition of turning nodes in the method for formulating a high-efficiency lng transportation strategy according to an embodiment of the present invention.
Detailed Description
The method of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the high efficiency lng carrier strategy formulation method performs the following steps:
step 1: generating a road traffic network of a target area;
step 2: marking necessary nodes for natural gas transportation in a road traffic network; the necessary nodes are defined as nodes through which transportation vehicles must pass in the process of transporting natural gas;
step 3: marking barrier nodes for natural gas transportation in a road traffic network; the obstacle nodes are defined as nodes which the transportation vehicle must avoid in the natural gas transportation process;
step 4: generating all possible routes of natural gas transportation in a road traffic network based on the obstacle nodes and the necessary nodes, and recording;
step 5: performing route efficiency evaluation on all the generated possible routes, and generating route efficiency of each possible route, wherein the route efficiency evaluation specifically comprises the following steps: projecting each possible route into a two-dimensional planar coordinate system, and translating from the starting point of the possible route by using a circumference area with the radius of the circumference area as an interval until the circumference area no longer covers any part of the possible route; recording in real time, during the translation of the circumferential region, the sub-efficiency of a portion of the possible routes covered by the circumferential region; calculating the total efficiency of each possible route based on all the sub-efficiencies as the route efficiency of the possible route;
step 6: and taking the possible route with highest route efficiency as the final route of natural gas transportation based on the calculated route efficiency of each possible route.
Generally, how to find the most efficient transportation route and the problem is essentially how to deal with the obstacle nodes and the must-go nodes, finding the shortest route.
In practice, however, it is often difficult to manually find the most efficient route.
In the invention, the route with highest route efficiency is finally found by finding all possible routes and calculating the efficiency from the routes through a circumferential area traversal method.
Further, in the step 1, the method for generating the road traffic network of the target area includes:
step 1.1: the abstract processing of the planar map of the target area specifically comprises the following steps: a crowd gathering place is defined and screened out in a plane map of a target area or a transportation station is stopped, a center of the crowd gathering place which is defined and screened out is calculated, a circular area is defined by taking the center as a circle center, and all places in the crowd gathering place are required to be wrapped in the circular area;
step 1.2: scaling a circular area defined by a crowd gathering place in a planar map of a target area until the area of all the circular areas in the target area is smaller than a set threshold value, recording the scaling at the moment to obtain a road traffic network of the target area, and marking the crowd gathering place and a transportation stop in the obtained road traffic network of the target area.
In particular, natural gas transportation often needs to avoid crowd gathering sites in view of safety concerns.
Further, the value range of the scaling ratio satisfies the following conditions:wherein pix is an average pixel area value of the width of each road in the planar map of the target area; DIS is the pixel area value of the largest circular area among the delineated circular areas; p is the scaling.
By scaling, a region is abstracted into a point, which facilitates the formulation and selection of subsequent routes.
Still further, in the step 2: the method for marking the necessary nodes for natural gas transportation in the road traffic network comprises the following steps: and taking the transport transit stop marked in the road traffic network as a transit-passing node.
Still further, the method for marking the obstacle node of natural gas transportation in the road traffic network in the step 3 includes: and taking the crowd gathering places marked in the road traffic network as obstacle nodes.
Still further, the method for generating all possible routes of natural gas transportation in the road traffic network based on the obstacle nodes and the necessary nodes in the step 4 includes:
step 4.1: connecting all necessary nodes in the road traffic network to generate transport necessary nodes;
step 4.2: connecting all barrier nodes in a road traffic network to generate a transportation barrier line;
step 4.3: if the transport necessary warp and the transport barrier line are crossed, executing the step 4.4; if the transport necessary warp and the transport barrier line are overlapped, executing the step 4.5; if the transport necessary warp and the transport barrier line are mutually disjoint and are not coincident, directly executing the step 4.6;
step 4.4: setting an obstacle radius by taking each obstacle node in the transportation obstacle line as a circle center, if the crossing part of the transportation necessary warp and the transportation obstacle line is within the obstacle radius, moving the crossing part in the transportation necessary warp until the crossing part is outside the obstacle radius, and then executing the step 4.6;
step 4.5: moving the part of the transport necessary warp and the transport barrier line until the transport necessary warp and the transport barrier line do not overlap, and then executing the step 4.6;
step 4.6: and connecting the part of the road traffic network except the transportation barrier line and the transportation necessary line with the transportation necessary line to obtain all possible routes.
Furthermore, in the step 5, the route efficiency evaluation is performed on all the generated possible routes, and before the route efficiency of each possible route is generated, the method further comprises the steps of eliminating the part of the transport necessary warps in the possible routes, and then connecting the eliminated possible routes.
Still further, the method for recording the sub-efficiency of a portion of the possible routes covered by the circumferential area in real time during the translation of the circumferential area in step 5 includes: the sub-efficiency is calculated using the following formula: f= [1.8×n]*[0.5*|lg(L)|]*[|1.2*sinθ 1 *sinθ 2 *…*sinθ n |]The method comprises the steps of carrying out a first treatment on the surface of the Where F is the sub-efficiency, N is the number of turning points of a part of the covered possible route, L is the length of a part of the covered possible route, θ n The straight line connecting adjacent turning points that are part of the covered possible route forms an angle with the horizontal plane.
In practice, factors affecting efficiency often relate to the number of turning points, the angle between the line of turning points and the horizontal plane, and the length of the route.
In the present invention, the definition of efficiency is different from the actual efficiency. In the invention, the longer the route passing in unit time, the more turning points, the higher the efficiency. As this means that the transport of natural gas arrives at more sites and the transport tasks are more completed.
Still further, the method for calculating the total efficiency of each possible route as the route efficiency of the possible route in step 5 based on all the sub-efficiencies includes:
where H is the route efficiency of the possible routes; a, a n Normalized values of angles of straight lines connecting adjacent turning points of a portion of a possible route covered by the circumferential area with a horizontal plane.
Still further, the a n The calculation of (2) uses the following formula:
while specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these specific embodiments are by way of example only, and that various omissions, substitutions, and changes in the form and details of the methods and systems described above may be made by those skilled in the art without departing from the spirit and scope of the invention. For example, it is within the scope of the present invention to combine the above-described method steps to perform substantially the same function in substantially the same way to achieve substantially the same result. Accordingly, the scope of the invention is limited only by the following claims.
Claims (6)
1. A method for formulating a high efficiency lng transfer strategy, said method comprising the steps of:
step 1: generating a road traffic network of a target area;
step 2: marking necessary nodes for natural gas transportation in a road traffic network; the necessary nodes are defined as nodes through which transportation vehicles must pass in the process of transporting natural gas;
step 3: marking barrier nodes for natural gas transportation in a road traffic network; the obstacle nodes are defined as nodes which the transportation vehicle must avoid in the natural gas transportation process;
step 4: generating all possible routes of natural gas transportation in a road traffic network based on the obstacle nodes and the necessary nodes, and recording;
step 5: performing route efficiency evaluation on all the generated possible routes, and generating route efficiency of each possible route, wherein the route efficiency evaluation specifically comprises the following steps: projecting each possible route into a two-dimensional planar coordinate system, and translating from the starting point of the possible route by using a circumference area with the radius of the circumference area as an interval until the circumference area no longer covers any part of the possible route; recording in real time, during the translation of the circumferential region, the sub-efficiency of a portion of the possible routes covered by the circumferential region; calculating the total efficiency of each possible route based on all the sub-efficiencies as the route efficiency of the possible route;
step 6: based on the calculated route efficiency of each possible route, taking the possible route with the highest route efficiency as the final route of natural gas transportation;
in the step 1, the method for generating the road traffic network of the target area includes:
step 1.1: the abstract processing of the planar map of the target area specifically comprises the following steps: a crowd gathering place is defined and screened out in a plane map of a target area or a transportation station is stopped, a center of the crowd gathering place which is defined and screened out is calculated, a circular area is defined by taking the center as a circle center, and all places in the crowd gathering place are required to be wrapped in the circular area;
step 1.2: scaling a circular area defined by a crowd gathering place in a planar map of a target area until the areas of all the circular areas in the target area are smaller than a set threshold value, recording the scaling at the moment to obtain a road traffic network of the target area, and marking the crowd gathering place and transport stops in the road traffic network of the obtained target area;
the method for generating all possible routes of natural gas transportation in the road traffic network based on the obstacle nodes and the necessary nodes in the step 4 comprises the following steps:
step 4.1: connecting all necessary nodes in the road traffic network to generate transport necessary nodes;
step 4.2: connecting all barrier nodes in a road traffic network to generate a transportation barrier line;
step 4.3: if the transport necessary warp and the transport barrier line are crossed, executing the step 4.4; if the transport necessary warp and the transport barrier line are overlapped, executing the step 4.5; if the transport necessary warp and the transport barrier line are mutually disjoint and are not coincident, directly executing the step 4.6;
step 4.4: setting an obstacle radius by taking each obstacle node in the transportation obstacle line as a circle center, if the crossing part of the transportation necessary warp and the transportation obstacle line is within the obstacle radius, moving the crossing part in the transportation necessary warp until the crossing part is outside the obstacle radius, and then executing the step 4.6;
step 4.5: moving the part of the transport necessary warp and the transport barrier line until the transport necessary warp and the transport barrier line do not overlap, and then executing the step 4.6;
step 4.6: connecting a transportation barrier line and a part except the transportation necessary line in the road traffic network with the transportation necessary line to obtain all possible routes;
the method for recording the sub-efficiency of a part of the possible routes covered by the circumferential area in real time during the translation of the circumferential area in the step 5 comprises the following steps: the sub-efficiency is calculated using the following formula:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For sub-efficiency, ++>The number of turning points of a part of the possible route to be covered, < >>Length of part of possible route for coverage, +.>An angle between a straight line connecting adjacent turning points of a part of the covered possible route and a horizontal plane;
the method for calculating the total efficiency of each possible route as the route efficiency of the possible route in the step 5 based on all the sub-efficiencies includes:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Route efficiency, which is the possible route; />Normalized values of angles of straight lines connecting adjacent turning points of a portion of a possible route covered by the circumferential area with a horizontal plane.
2. The method of claim 1, wherein the scale range satisfies the following condition:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>An average pixel area value for the width of each road in the planar map of the target area;pixel area value for the largest circular region among the delineated circular regions; />Is a scaling factor.
3. The method according to claim 2, wherein in step 2: the method for marking the necessary nodes for natural gas transportation in the road traffic network comprises the following steps: and taking the transport transit stop marked in the road traffic network as a transit-passing node.
4. A method according to claim 3, wherein the method of marking the obstacle nodes of natural gas transportation in the road traffic network in step 3 comprises: and taking the crowd gathering places marked in the road traffic network as obstacle nodes.
5. The method of claim 4, wherein the step 5 of evaluating the route efficiency of all the generated possible routes further comprises removing portions of the transport routes from the possible routes before generating the route efficiency of each possible route, and then connecting the removed possible routes.
6. The method of claim 5, wherein theThe calculation of (2) uses the following formula:。
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