CN112560208A - Optimized layout method and system for remote control mechanism of valves of urban gas pipe network - Google Patents

Optimized layout method and system for remote control mechanism of valves of urban gas pipe network Download PDF

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CN112560208A
CN112560208A CN202011366892.9A CN202011366892A CN112560208A CN 112560208 A CN112560208 A CN 112560208A CN 202011366892 A CN202011366892 A CN 202011366892A CN 112560208 A CN112560208 A CN 112560208A
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gas
pipe section
stopping
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gas pipe
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CN112560208B (en
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侯龙飞
程钰峰
袁宏永
端木维可
丁超
付明
周苏安
李润婉
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Anhui Zeone Safety Technology Co ltd
Hefei Zezhong City Intelligent Technology Co ltd
Hefei Institute for Public Safety Research Tsinghua University
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Anhui Zeone Safety Technology Co ltd
Hefei Zezhong City Intelligent Technology Co ltd
Hefei Institute for Public Safety Research Tsinghua University
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Abstract

The invention provides an optimized layout method and a system for a remote control mechanism of an urban gas pipe network valve, which are used for deducing and establishing a use benefit evaluation method for the remote control mechanism of a gas pipeline gas-stopping unit based on the aspects of gas pipeline risk considering emergency disposal capacity, the number of practical remote control mechanisms, negative effects of gas stopping and the like, constructing an optimization idea for reducing the remote control mechanism by merging adjacent gas stopping units and a constraint condition for finishing merging based on the size of the use benefit, and continuously merging the gas stopping unit with the highest use benefit with the adjacent units until an optimization termination condition is met. The establishment of the method is beneficial to the popularization and the use of a remote control mechanism of the gas pipe network valve, the gas safety construction is practically enhanced, and the realization of the accident casualty target is reduced.

Description

Optimized layout method and system for remote control mechanism of valves of urban gas pipe network
Technical Field
The invention relates to the technical field of gas pipe network monitoring, in particular to an optimized layout method and system for a remote control mechanism of a valve of an urban gas pipe network.
Background
With the increasing economic level of China, the urbanization process is accelerated continuously, and the length of urban buried gas pipelines is increased day by day. Meanwhile, due to the flammable and explosive characteristics of the gas, once leakage occurs, large casualties and economic losses are easily caused, according to incomplete statistics, gas explosion 702 occurs in China in 2017, more than 1100 people are injured, 126 people die, and frequent gas accidents bring new challenges to city safety. When a large amount of leakage occurs in the gas pipeline, in order to avoid explosion accidents, the valve of the leaked gas pipeline needs to be closed emergently. Due to factors such as traffic, the time for operators of gas companies to arrive at the site to close the manual valve becomes an uncontrollable factor, which is not favorable for the control of emergencies. For example, in the 7 & 4 pine original gas pipeline explosion accident, the gas pipeline is penetrated and leaked due to third-party construction, and a large amount of gas is leaked due to untimely closing of a valve and is diffused to the hospital of the pine original city to explode, so that 5 death and 85 injury are caused, and the direct economic loss is up to 4419 ten thousand yuan.
The valve remote control mechanism is a pipeline valve remote control device, a remote control execution mechanism is additionally arranged on the existing pipeline valve, and the valve is remotely cut off when the gas pipeline leaks, so that the gas leakage time is effectively reduced, the accident range is narrowed, and the accident situation is controlled. Because of numerous urban gas pipeline valves, an optimized layout method is necessary to be established to reasonably layout the remote control mechanism.
At present, the optimization scheme of monitoring point positions mostly focuses on the monitoring fields of air, noise and the like. If the article number is: 2095 and 672X (2018)08-0128-01, which discloses an air monitoring point location optimization arrangement discussion (environmental protection agency of district Lingan district, Hangzhou, Xulei Zhejiang province, 311300, Zhejiang Hangzhou), discloses the arrangement of monitoring equipment by a concentric circle method, a fan-shaped method, a functional distribution point method and the like based on the position of a pollution source. The monitoring point location optimization method disclosed in the article performs monitoring point location arrangement according to the characteristics of the surrounding environment for the determined pollution source. Is not suitable for valve control optimization of the existing gas pipe network.
Disclosure of Invention
The invention aims to solve the technical problem of providing a layout optimization scheme of a gas pipeline valve remote control mechanism.
The invention solves the technical problems through the following technical means:
an optimized layout method for a remote control mechanism of a valve of an urban gas pipe network comprises the following steps
S01, dividing a gas pipe network in a region where a remote control mechanism is to be distributed into a plurality of basic gas pipe section gas stopping units, wherein the basic gas stopping units of the gas pipe sections are valves which are not normally opened on the gas pipe sections in the units; the gas pipe section basic gas stopping unit i stops gas valve combination set vi＝{v1，v2…vj，vj+1…vo}; wherein v isjThe jth valve of the unit i for basically stopping gas in the gas pipe section;
s02. collecting viAll the basic gas stopping units of the gas pipe sections with the same valve are combined into the same unit, and the same unit and other basic gas stopping units of the gas pipe sections form a gas pipe section gas stopping unit set B together;
s03, carrying out risk assessment on gas pipe section gas stopping units in the set B, wherein risk R isiCan be represented as Ri＝PiCi/λi
Wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiThe accident emergency capacity of a remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling emergency events;
s04, constructing a unit actual remote control mechanism control risk amount kiTo characterize the role played by the remote control mechanism;
Figure BDA0002802234520000021
wherein R isiFor the risk value of the gas pipe section gas off unit i,
Figure BDA0002802234520000022
the actual amount of a remote control mechanism used for stopping the gas of the gas pipe section gas stopping unit;
s05, calculating gas stopping negative effects Ne of gas pipe section base gas stopping unit ii
Nei＝PiLiNi
Wherein L isiFor the length of the gas-off unit i, N of the gas-pipe sectioniThe number of users of the gas supply unit i for the gas pipe section;
s06, calculating a use benefit evaluation function S of a gas pipe section gas stopping unit i remote control mechanismi
Figure BDA0002802234520000023
S07. air-stopping unit optimization, for SiSorting is carried out, siRecording the gas-off unit of the gas pipe section with the largest value as maxS, firstly judging the number of maxS gas-off users, and if the number is larger than the maximum number N of allowed gas-off users, then carrying out gas-off operation on the maximum number NRemoving the gas from the set B, putting the gas into a set D, combining the gas with the connected gas pipe section gas stopping units if the number of maxS gas stopping users is less than N to form a new gas stopping unit, continuously keeping the new gas stopping unit in the set B, and performing S with the rest gas pipe section gas stopping unitsiSorting values, and repeating the process until all the gas stopping units meet the conditions and are put into a set D;
and S08, laying a remote control mechanism according to the gas pipelines in the set D.
Further, in the step S07, if a valve of the gas pipe segment gas-off unit to be merged appears in a plurality of valve sets, it is necessary to determine the combined benefit change Δ S first
ΔS＝Sx′-Sx
Wherein S'xIs a combined benefit value with an adjacent gas pipe section gas stopping unit SxThe original benefit value of the gas stopping unit of the adjacent gas pipe section is obtained;
respectively stopping the number N 'of users for the merged gas pipeline'xIs judged to be N'xWhether the number of users is greater than the maximum number of users allowed to stop the gas, N ', is selected'xMerging the gas pipe section gas stopping units which are smaller than N and have the maximum delta S; and if the number of the combined gas stopping users of the gas pipelines is larger than N, not combining the gas stopping units, removing the gas stopping units from the set B and putting the gas stopping units into the set D, and otherwise, remaining the gas stopping units in the original set and repeating the steps until the conditions are met and putting the gas stopping units into the set D.
Further, all the information in the set D are sequentially arranged according to the putting order.
The invention also provides an optimized layout system of the remote control mechanism of the valves of the urban gas pipe network, which comprises
The basic gas stopping unit division module of the gas pipe section divides a gas pipe network in a remote control area into a plurality of basic gas stopping units of the gas pipe section, wherein the basic gas stopping units of the gas pipe section are valves which are not normally opened on the gas pipe; the gas pipe section basic gas stopping unit i stops gas valve combination set vi＝{v1，v2…vj，vj+1…vo}; wherein v isjThe jth valve of the gas pipeline section basic gas stopping unit i is shown;
a gas-off unit forming module for gas pipe sectioniAll the basic gas stopping units of the gas pipe sections with the same valve are combined into the same unit, and the same unit and other basic gas stopping units of the gas pipe sections form a gas pipe section gas stopping unit set B together;
and the risk evaluation module is used for carrying out risk evaluation on the gas pipe section gas stopping unit, and the risk can be expressed as
Ri＝PiCi/λi
Wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiThe accident emergency capacity of a remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling emergency events;
a control risk amount calculation module for constructing a control risk amount k of the actual remote control mechanism of the unitiTo characterize the role played by the remote control mechanism;
Figure BDA0002802234520000041
wherein R isiFor the risk value of the gas pipe section gas off unit i,
Figure BDA0002802234520000042
the actual amount of a remote control mechanism used for stopping the gas of the gas pipe section gas stopping unit;
a gas-stopping negative effect calculating module for calculating gas-stopping negative effect Nei
Nei＝PiLiNi
Wherein L isiFor gas-off unit i length, N of gas pipe sectioniThe number of users of the gas supply unit i for the gas pipe section;
the benefit evaluation module is used for calculating the use benefit of the gas pipe section gas stopping unit i remote control mechanismEvaluation function Si
Figure BDA0002802234520000043
Air cut-off unit optimization module, pair SiSorting is carried out, SiRecording the gas-off unit of the gas pipe section with the largest value as maxS, firstly judging the number of maxS gas-off users, if the number of maxS gas-off users is larger than the maximum number N of users allowed to stop gas, removing the maxS gas-off users from the set B, putting the maxS gas-off users into the set D, if the number of maxS gas-off users is smaller than N, combining the maxS gas-off users with the connected gas pipe section gas-off units to form a gas pipeline, continuously keeping the gas pipeline in the set B, and performing S with the rest gas pipe section gas-iSequencing values, and repeating the process until all the gas pipelines meet the conditions and are put into a set D;
and the control mechanism laying module is used for laying the remote control mechanism according to the gas pipelines in the set D.
Further, in the benefit evaluation module, if a certain valve of the gas pipe section gas stop unit to be merged appears in a plurality of valve sets, it is necessary to first determine the merged benefit change Δ S
ΔS＝Sx′-Sx
Wherein S'xIs a combined benefit value with an adjacent gas pipe section gas stopping unit SxThe original benefit value of the gas stopping unit of the adjacent gas pipe section is obtained;
respectively stopping the number N 'of users for the merged gas pipeline'xIs judged to be N'xWhether it is greater than the maximum number of users N allowed to stop air, N 'is selected'xMerging the gas pipe section gas stopping units which are smaller than N and have the maximum delta S; and if the number of the combined gas pipeline gas stopping users is larger than N, removing the gas pipeline from the set B and putting the gas pipeline into a set D, otherwise, remaining the gas pipeline in the original set and repeating the steps until the conditions are met and putting the gas pipeline into the set D.
Further, all the information in the set D are sequentially arranged according to the putting order.
The present invention also provides a computer-readable storage medium storing computer instructions for causing the computer to perform the above-described method.
The invention also provides a processing device comprising at least one processor and at least one memory communicatively connected to the processor, wherein the memory stores program instructions executable by the processor, and the processor is capable of executing the above method using the program instructions.
The invention has the advantages that:
the invention provides an optimized layout method for a remote control mechanism of an urban gas pipe network valve, which is characterized in that firstly, a use benefit evaluation method for the remote control mechanism of a gas pipeline gas stop unit is established based on the aspects of gas pipeline risk, actual remote control mechanism quantity, gas stop negative effects and the like considering emergency handling capacity, and the result shows that the use benefit is related to the result of large-amount leakage of a gas pipeline, the emergency handling capacity, the length of the gas stop unit pipeline, the number of users and the actual quantity of the remote control mechanism. Furthermore, based on the size of the use benefit, an optimization idea for merging adjacent gas stopping units to reduce the remote control mechanism and a constraint condition for ending merging are constructed, and the recommended installation sequence of the remote control mechanism is obtained by continuously merging the gas stopping unit with the highest use benefit with the adjacent units. The establishment of the method is beneficial to the popularization and the use of a remote control mechanism of the gas pipe network valve, the gas safety construction is practically enhanced, and the realization of the accident casualty target is reduced.
Drawings
FIG. 1 is a block flow diagram of an optimization method in an embodiment of the invention;
FIG. 2 is a schematic view of a control valve assembly of the same gas pipe section in an embodiment of the present invention;
FIG. 3 is a schematic view of the fusion of the basic tube segments in an embodiment of the present invention;
FIG. 4 is a schematic representation of the base segment of FIG. 3 after fusion;
FIG. 5 is a diagram of the preliminary arrangement of valve points for the example of the present invention;
FIG. 6 is a number line graph of a gas shut-off unit and valves in an embodiment of the present invention;
fig. 7 is a diagram of the final layout of the valves in the example of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A large amount of leakage of the gas pipeline is frequently generated in the urban medium-pressure and above-pressure-level pipe network, so that the optimization method of the embodiment aims at the urban medium-pressure and above-pressure-level pipe network and the valve. As shown in fig. 1, the method for optimally arranging the remote control mechanism of the valves of the urban gas pipe network specifically comprises the following steps:
step 1, the buried gas pipe network can be simplified to be composed of gas pipe sections (lines) and valves (points), the gas pipe network is separated by the valves to form a plurality of basic gas stopping units of the gas pipe sections, and the basic gas stopping units of the gas pipe sections mean that no normally open valves on the gas pipe divide the gas pipe into smaller units. Corresponding valve group v for stopping gas in gas pipe section ii＝{v1，v2…vj，vj+1…vo}; wherein v isjShowing the jth valve of the gas pipe section basic gas stopping unit i.
And 2, for the basic gas stopping units of different gas pipe sections, the condition that the valve composition sets are the same exists. As shown in FIG. 2, for the gas pipeline section to basically stop gas in the AB and AC units, a valve set is required to stop gas in the AB and AC unitsA，vB，vCAnd is closed. The basic gas stopping units of the same gas pipeline with the same valves of the remote control mechanism installed in the set are combined into the same gas pipeline section gas stopping unit, and the gas stopping units and other gas pipeline section basic gas stopping units form a new gas pipeline gas stopping unitAnd (4) a set B.
And 3, installing a valve remote control mechanism for auxiliary control of the gas pipeline needing gas stopping (generally large leakage). Firstly, based on the idea of risk, the risk assessment is carried out on the gas pipeline unit. The risk is generally expressed as the product of the probability P and the consequence C. The valve remote control mechanism serves to reinforce the emergency capacity, so in this embodiment the risk assessment needs to consider the emergency capacity factor λ heavily. I.e. the risk of a gas pipe section gas cut-off unit in set B can be expressed as:
Ri＝PiCi/λi (1)
wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiThe accident emergency capacity of a remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling emergency events;
step 4, representing economic investment by using the installation quantity of the remote control mechanisms, and constructing the actual remote control mechanism control risk amount k of a unitiTo characterize the role played by the remote control mechanism.
Figure BDA0002802234520000071
Wherein R isiFor the risk value of the gas pipe section gas off unit i,
Figure BDA0002802234520000072
the actual amount of remote control mechanism used to stop the gas supply to the gas supply unit of the gas pipe section. Due to the intersection of the pipe sections, there are situations where a remote control mechanism is used in multiple airlock units. A remote control mechanism actual quantity
Figure BDA0002802234520000073
Is defined as
Figure BDA0002802234520000074
Wherein the content of the first and second substances,
Figure BDA0002802234520000075
is the sum of the frequencies that the remote control mechanism occurs collectively in each control mechanism. In combination with the formulas (2) and (3), the corresponding risk k of the gas stopping unit is higher for the remote control mechanism with the same actual use amountiThe larger the value, the better the control effect.
And 5, considering from the perspective of users, for the remote control mechanism with the same actual usage amount, the longer the gas pipeline in the corresponding gas pipeline gas stopping unit is, the higher the possibility that the gas is stopped due to leakage of any point of the gas pipeline is, and the negative effect is exerted on the control, and the larger the number of users is, the larger the negative effect is. This negative effect can be expressed by the following formula
Nei＝PiLiNi (4)
Wherein L isiFor the length of the gas-off unit i, N of the gas-pipe sectioniAnd (4) stopping the gas supply unit for the gas pipe section.
Step 6, controlling the risk quantity k by the comprehensive unit actual remote control mechanismiNegative effects of stopping gas NeConstructing a use benefit evaluation function S of the gas pipe section remote control mechanismi。SiThe higher the value, the higher the risk of control by the remote control mechanism, and the less the impact of the gas cut on the user.
Figure BDA0002802234520000076
Combined formulae (1), (2), (4), SiCan be expressed as
Figure BDA0002802234520000077
Namely, the use benefit of the remote control mechanism of the gas pipe section is related to the accident consequence of the gas stop unit, the accident emergency capacity, the length of the gas pipeline in the unit and the number of users.
Step 7, optimizing gas pipe section gas stopping unit
Forming new valve set of each remote control mechanism corresponding to the gas pipeline unit, calculating each gas pipeline SiValue, and sort. To SiThe largest basic gas pipe section (maxS) is combined with the connected pipe section units to form a new gas pipe section gas stopping unit. Firstly, judging the number of maxS gas-off users, if the maxS gas-off users are more than the maximum number N of allowed gas-off users, not processing the basic gas pipe section, marking the basic gas pipe section as a ready-to-reach pipe section, removing the pipeline information from the set B, putting the pipe information into a set D, and recording the putting sequence. If the maxS gas stopping users are smaller than N, the maxS gas stopping users are combined with the connected gas pipe section gas stopping units to form a gas pipeline, the gas pipeline is continuously kept in the set B, and S is carried out on the gas pipeline and the rest gas pipe section gas stopping unitsiSorting values, and repeating the process until all the gas pipelines meet the conditions and are put into a set D;
as shown in fig. 3 and 4, in a real situation, there is a case where one gas pipe section basic gas stop unit is connected to a plurality of basic units. When the valve in the valve set corresponding to the basic gas stopping unit of the gas pipe section appears in a certain pipeline valve closing set, the basic gas stopping unit of the gas pipe section is considered to be connected with the pipeline. When a certain valve of the basic gas pipe section to be combined appears in a plurality of sets, namely the basic gas pipe section is connected with a plurality of gas pipe sections, if the basic gas pipe section is combined by the valve, all the pipe sections of the valve existing in the pipe valve set need to be combined. The pipe sections AB, BC and BD share a valve V as shown in FIG. 3BIf AB and BC merge, only the valve { V } is closedA，VCAC can not be stopped, and the corresponding air stop valves are integrated into a set of VA，VC， VD}。
Constructing a judgment function, wherein delta S is the combined benefit change amount, S'xFor the combined benefit value of adjacent pipeline units, SxThe original benefit value of the adjacent pipeline is obtained.
ΔS＝Sx′-Sx (16)
Respectively butt-combined new gas pipe sectionAir stopping unit air stopping user number N'xIs judged to be N'xWhether greater than the maximum number of users allowed to deactivate N ', when N'xAnd when the gas flow rate is larger than N, the gas stopping units are not combined. Namely, N 'after merging is selected'xAnd merging the basic units which are smaller than N and have the largest effect change after merging. And if the number of the new basic gas pipe section gas stopping users is more than N, the gas pipe section gas stopping units reach the standard, the pipeline information is removed from the set B, the pipeline information is put into a set D, the putting sequence is recorded, and if not, the pipeline information is left in the original set and the steps are repeated until the condition is met and the pipeline information is put into the set D.
And when the corresponding valves of the pre-combined gas pipe sections are all in the corresponding valve sets of the standard pipe sections, the pipe sections are not required to be combined, the set D is put, and the putting sequence numbers are consistent with the sequence of the pipeline connected with the set D.
After each round of combination, for each gas pipeline SiThe values are recalculated for sorting and the merge operation described above is performed. And optimizing until the number of the control mechanisms reaches the target number of the gas companies or all the gas pipe sections do not meet the merging condition. And (4) carrying out remote control mechanism arrangement on corresponding valves from front to back according to the arrangement sequence of the D pipe sections of the manifold.
Case(s)
In order to verify the effectiveness of the valve closing point optimization method, the medium-pressure pipe network with the total length of 200km is selected as case analysis discussion. Performing preliminary dotting on the pipe network, wherein each point represents the position of a valve and is 67 in total as shown in FIG. 5; table 1 shows the summary information for 46 airlock units. As can be seen from the graph, the valve layout is not uniform, and the gas stop unit has the necessity of layout optimization, and the layout of the valve points of the pipe network is repeatedly calculated by the merging optimization method proposed above.
Figure BDA0002802234520000091
Figure BDA0002802234520000101
The optimization method based on the benefit evaluation function has the core that the gas stopping units are combined for repeated calculation. The 46 air stopping units are ranked according to the benefit evaluation value, maxS and peripheral air stopping units are combined, and N 'is calculated'xComparing with 20000 local maximum number of air-stopping users, if the merging condition is not satisfied, putting into D set; and if the merging condition is met, continuing merging according to the rule until the circulation is ended. Figure 6 shows a graph of the number of remaining gas-off units and remote control mechanisms per optimization.
When the gas stopping units are combined into 10 gas stopping units, all the gas stopping units can enter the D set, the layout of 67 valves is optimized to 21, the layout diagram is shown in the following figure 7, and the comprehensive information is shown in the table 2.
Figure BDA0002802234520000111
Comparing fig. 7 and 5, it can be found that compared with the preliminary point arrangement, the final scheme eliminates the valve bunching phenomenon in the arrangement area, and eliminates the valve points which cause repeated gas stop and have lower risks.
Conclusion
The remote valve control mechanism of the gas pipe network is helpful for emergency treatment personnel to effectively control a large number of gas leakage events. The invention provides an optimized layout method for a remote control mechanism of a valve of an urban gas pipe network, and the feasibility and the effectiveness of the method are discussed by adopting related examples. Firstly, a use benefit evaluation method of a remote control mechanism of a gas pipeline gas stop unit is deduced and established based on the aspects of the risk of the gas pipeline considering emergency handling capacity, the number of practical remote control mechanisms, the negative effect of gas stop and the like, and the result shows that the use benefit is related to the result of large leakage of the gas pipeline, the emergency handling capacity, the length of the pipeline of the gas stop unit, the number of users and the practical amount of the remote control mechanism. Further, based on the size of the use benefit, an optimization idea of combining adjacent gas stopping units and reducing a remote control mechanism and a constraint condition of combining the adjacent gas stopping units are constructed, and the gas stopping units with the highest use benefit are combined with the adjacent units continuously until the total number of the gas stopping units reaches the economic bearable degree. The establishment of the method is beneficial to the popularization and the use of a remote control mechanism of the gas pipe network valve, practically strengthens the gas safety construction and assists in realizing the aim of zero death accident.
The embodiment also provides an optimized layout system for the remote control mechanism of the valves of the urban gas pipe network, which comprises
The buried gas pipe network can be simplified to be composed of gas pipe sections (lines) and valves (points), the gas pipe network is separated by the valves to form a plurality of basic gas stopping units of the gas pipe sections, and the basic gas stopping units of the gas pipe sections mean that no normally open valve on the gas pipe divides the gas pipe into smaller units. Set v of corresponding valves for deactivating gas pipe section ii＝{v1，v2…vj，vj+1…vo}; wherein v isjAnd the jth valve of the gas pipe section basic gas stopping unit i is shown.
The gas pipe section gas stopping unit forms a module, and the condition that valve composition sets are the same exists for different gas pipe section basic units. As shown in FIG. 2, to stop the gas supply to the gas pipeline base units AB and AC, a valve set { v } is requiredA，vB，vCAnd is closed. And the basic units of the same gas pipeline, which are provided with the same valves of the remote control mechanism, in the set are combined into a gas pipeline section gas stopping unit, and the gas pipeline section gas stopping unit and other basic gas stopping units of the gas pipeline section form a new gas pipeline unit set B together.
The risk evaluation module of the gas-off unit of the gas pipe section and the valve remote control mechanism are installed for performing auxiliary control on the gas pipeline needing gas-off (generally large-amount leakage). Firstly, based on the idea of risk, the risk evaluation is carried out on the gas pipeline unit. The risk is generally expressed as the product of the probability P and the consequence C. The valve remote control mechanism is used for reinforcing the emergency capacity, so the emergency capacity factor lambda needs to be considered in the risk assessment in the embodiment. I.e. the risk of a gas pipe section in set B being essentially a gas-off unit can be expressed as:
Ri＝PiCi/λi (1)
wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiAnd the accident emergency capacity of the remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling the emergency.
The control risk calculation module represents economic investment by using the installation number of remote control mechanisms and constructs the actual remote control mechanism control risk k of a unitiTo characterize the role played by the remote control mechanism.
Figure BDA0002802234520000121
Wherein R isiFor the ith gas pipe segment basic gas off unit risk value,
Figure BDA0002802234520000122
the actual amount of remote control mechanism used to stop the gas in this section of the gas pipeline. Due to the intersection of the pipe sections, there are situations where a remote control mechanism is used in multiple gas shut-off units. A remote control mechanism actual quantity
Figure BDA0002802234520000131
Is defined as
Figure BDA0002802234520000132
Wherein the content of the first and second substances,
Figure BDA0002802234520000133
is the sum of the frequencies that the remote control mechanism occurs collectively in each control mechanism. In combination with the formulas (2) and (3), the corresponding risk k of the gas stopping unit is higher for the remote control mechanism with the same actual use amountiThe larger the value, the better the control effect.
And meanwhile, considering from the perspective of users, for the same actual usage amount remote control mechanism, the longer the gas pipeline in the corresponding gas pipeline gas stopping unit is, the higher the possibility of gas stopping caused by leakage of any point of the gas pipeline is, and the negative effect is exerted on the control, and the larger the number of users is, the larger the negative effect is. This negative effect can be expressed by the following formula
Nei＝PiLiNi (4)
In the formula LiFor gas pipeline length of gas-off unit, NiThe number of users of the gas stop unit.
Benefit evaluation module, and comprehensive unit actual remote control mechanism control risk amount kiNegative effects of stopping gas NeConstructing a gas pipe section remote control mechanism use benefit evaluation function Si。SiThe higher the value, the higher the risk of control by the remote control mechanism, and the less the user is affected by the gas cut-off.
Figure BDA0002802234520000134
Combined formulae (1), (2), (4), SiCan be expressed as
Figure BDA0002802234520000135
Namely, the use benefit of the remote control mechanism of the gas pipe section is related to the accident consequence of the gas stop unit, the accident emergency capacity, the length of the gas pipeline in the unit and the number of users.
An optimization module calculating each gas line siValues, and sorting. To SiAnd combining the basic gas pipe section (maxS) with the maximum value with the connected pipe section units to form a new gas pipe section gas stopping unit. Firstly, judging the number of maxS gas-off users, if the maxS gas-off users are more than the maximum number N of allowed gas-off users, not processing the basic gas pipe section, marking the basic gas pipe section as a ready standard pipe section, removing the pipeline information from the set B, putting the pipeline information into the set D, and adding the standard pipe section to the set DThe sequence is put in for recording. If the number of the maxS gas-off users is less than N, the maxS gas-off users are combined with the connected gas pipe section gas-off units to form a gas pipe, the gas pipe section gas-off units are continuously kept in the set B, and S is carried out on the gas pipe section gas-off units and the rest gas pipe section gas-off unitsiSorting values, and repeating the process until all the gas pipelines meet the conditions and are put into a set D;
in a real situation, there is a case where one basic gas pipe segment gas stop unit is connected to a plurality of basic units. When the valve in the valve set corresponding to the basic gas pipe section gas stopping unit appears in a certain pipeline valve closing set, the basic gas pipe section gas stopping unit is considered to be connected with the pipeline. When a certain valve of the basic gas pipe section to be combined appears in a plurality of sets, namely the basic gas pipe section is connected with a plurality of gas pipe sections, if the basic gas pipe section is combined by the valve, all the pipe sections of the valve existing in the pipe valve set need to be combined. The pipe sections AB, BC and BD share a valve V as shown in FIG. 3BIf AB and BC merge, only the valve { V } is closedA，VCAC can not be stopped, and the corresponding air stop valves are integrated into a set of VA，VC，VD}。
Constructing a judgment function, wherein delta S is the combined benefit change amount, S'xFor the combined benefit value of adjacent pipeline units, SxThe original benefit value of the adjacent pipeline is obtained.
ΔS＝Sx-Sx (16)
Respectively counting the number N 'of gas stopping users of the merged new gas pipe section gas stopping unit'xIs judged to be N'xWhether greater than the maximum number of users allowed to deactivate N ', when N'xAnd when the gas flow rate is larger than N, the gas stopping units are not combined. Namely, N 'after merging is selected'xAnd merging the basic units which are smaller than N and have the largest effect change after merging. And if the number of the new basic gas pipe section gas stopping users is more than N, the gas pipe section gas stopping units reach the standard, the pipeline information is removed from the set B, the pipeline information is put into a set D, the putting sequence is recorded, and if not, the pipeline information is left in the original set and the steps are repeated until the condition is met and the pipeline information is put into the set D.
And when the corresponding valves of the pre-combined gas pipe sections are all in the corresponding valve sets of the standard pipe sections, the pipe sections are not required to be combined, the set D is put, and the putting sequence numbers are consistent with the sequence of the set D which is finally put into the pipeline connected with the set D.
After each round of combination, for each gas pipeline siThe values are recalculated for sorting and the merge operation described above is performed. And optimizing until the number of the control mechanisms reaches the target number of the gas companies or all the gas pipe sections do not meet the merging condition. And (4) according to the D putting sequence, carrying out remote control mechanism arrangement on the corresponding valves from front to back.
The present embodiments also provide a computer-readable storage medium storing computer instructions that cause the computer to perform the above-described method.
The invention also provides a processing device comprising at least one processor and at least one memory communicatively connected to the processor, wherein the memory stores program instructions executable by the processor, and the processor is capable of executing the above method using the program instructions.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (8)

1. An optimized layout method for a remote control mechanism of a valve of an urban gas pipe network is characterized by comprising the following steps: comprises the following steps
S01, dividing a gas pipe network in a remote control area into a plurality of basic gas stopping units of gas pipe sections, wherein the basic gas stopping units of the gas pipe sections are valves which are not normally opened on a gas pipeline; the gas pipe section basic gas stopping unit i stops gas valve combination set vi＝{v1,v2…vj,vj+1…vo}; wherein v isjThe jth valve of the unit i for basically stopping gas in the gas pipe section;
s02. collecting viAll gas pipe section gas stopping units with the same valve are combined into the same gas pipe section gas stopping unit, and the gas pipe section gas stopping unit assembly B is formed by combining the gas pipe section gas stopping units with other gas pipe section gas stopping units
S03, carrying out risk assessment on gas pipe section gas stopping units in the set B, wherein risk R isiCan be expressed as
Ri＝PiCi/λi
Wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiThe accident emergency capacity of a remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling emergency events;
s04, constructing a unit actual remote control mechanism control risk amount kiTo characterize the role played by the remote control mechanism;
Figure FDA0002802234510000011
wherein R isiFor the risk value of the gas pipe section gas off unit i,
Figure FDA0002802234510000012
the actual amount of a remote control mechanism used for stopping the gas of the gas pipe section gas stopping unit i;
s05, calculating gas stopping negative effects Ne of gas pipe section gas stopping unit ii
Nei＝PiLiNi
Wherein L isiFor the length of the gas-off unit i, N of the gas-pipe sectioniThe number of users of the gas supply unit i for the gas pipe section;
s06, calculating a use benefit evaluation function S of a gas pipe section gas stopping unit i remote control mechanismi
Figure FDA0002802234510000013
S07. air-stopping unit optimization, for SiSorting is carried out, SiRecording the gas-off unit of the gas pipe section with the largest value as maxS, firstly judging the number of maxS gas-off users, if the number of maxS gas-off users is larger than the maximum number N of users allowed to stop gas, removing the maxS gas-off users from the set B, putting the maxS gas-off users into the set D, if the number of maxS gas-off users is smaller than N, combining the maxS gas-off users with the connected gas-off units of the gas pipe section to form a gas pipeline, continuously keeping the gas pipeline in the set B, and performing S with the restiSorting values, and repeating the process until all the gas pipelines meet the conditions and are put into a set D;
and S08, laying a remote control mechanism according to the gas pipelines in the set D.
2. The optimized layout method of the urban gas pipe network valve remote control mechanism according to claim 1, characterized in that: in step S06, if a valve of the gas pipe segment gas cut-off unit to be merged appears in a plurality of valve sets, it is necessary to determine the benefit change Δ S after merging
ΔS＝Sx′-Sx
Wherein Sx' is the benefit value, S, combined with the gas cut-off unit of the adjacent gas pipe sectionxThe original benefit value of the gas stopping unit of the adjacent gas pipe section is obtained;
respectively stopping the gas supply of the combined gas pipelines by the number N of usersx'judgment, N'xWhether the maximum number of users N allowed to stop the gas is larger than or not, and N is selectedx' gas pipe section gas stopping units which are smaller than N and have the maximum delta S are combined; and if the number of the combined gas pipeline gas stopping users is larger than N, removing the gas pipeline from the set B and putting the gas pipeline into a set D, otherwise, remaining the gas pipeline in the original set and repeating the steps until the conditions are met and putting the gas pipeline into the set D.
3. The optimized layout method of the urban gas pipe network valve remote control mechanism according to claim 1 or 2, characterized in that: and all the information in the set D is sequentially arranged according to the putting sequence.
4. The utility model provides a system is laid in city gas pipe network valve remote control mechanism optimization which characterized in that: comprises that
The gas pipe section basic gas stopping unit dividing module is used for dividing a gas pipe network in a remote control area into a plurality of gas pipe section basic gas stopping units, and the gas pipe section basic gas stopping units are valves which are not normally opened on a gas pipe; the gas pipe section basic gas stopping unit i stops gas valve combination set vi＝{v1,v2…vj,vj+1…vo}; wherein v isjThe jth valve of the unit i for basically stopping gas in the gas pipe section;
a gas-off unit forming module for gas pipe sectioniAll gas pipe section gas stopping units with the same valve are combined into the same unit to form a gas pipe section gas stopping unit set B;
and the risk evaluation module is used for carrying out risk evaluation on the gas pipe section gas stopping unit, and the risk can be expressed as
Ri＝PiCi/λi
Wherein P isiPossibility of gas cut-off for gas line section gas cut-off unit i due to leakage, CiFor the consequence of the gas-cut unit i, lambdaiThe accident emergency capacity of a remote control mechanism corresponding to the gas pipe section gas stopping unit i is used for representing the capacity of controlling emergency events;
a control risk amount calculation module for constructing a control risk amount k of the actual remote control mechanism of the unitiTo characterize the role played by the remote control mechanism;
Figure FDA0002802234510000031
wherein R isiUnit i risk value for gas pipe section gas cut-off，
Figure FDA0002802234510000032
The actual amount of a remote control mechanism used for stopping the gas of the gas pipe section gas stopping unit;
a gas-stopping negative effect calculating module for calculating gas-stopping negative effect Nei
Nei＝PiLiNi
Wherein L isiFor gas-off unit i length, N of gas pipe sectioniThe number of users of the gas supply unit i for the gas pipe section;
a benefit evaluation module for calculating the use benefit evaluation function S of the remote control mechanism of the gas pipe section gas stop unit ii
Figure FDA0002802234510000033
Air cut-off unit optimization module, pair SiSorting is carried out, SiRecording the gas-off unit of the gas pipe section with the largest value as maxS, firstly judging the number of maxS gas-off users, if the number of maxS gas-off users is larger than the maximum number N of users allowed to stop gas, removing the maxS gas-off users from the set B, putting the maxS gas-off users into the set D, if the number of maxS gas-off users is smaller than N, combining the maxS gas-off users with the connected gas-off units of the gas pipe section to form a gas pipeline, continuously keeping the gas pipeline in the set B, and performing S with the restiSorting values, and repeating the process until all the gas pipelines meet the conditions and are put into a set D;
and the control mechanism laying module is used for laying the remote control mechanism according to the gas pipelines in the set D.
5. The system of claim 4, wherein the system comprises: the benefit evaluation module is configured to, if a certain valve of the gas pipe section gas shutoff unit to be combined appears in a plurality of valve sets, first determine a combined benefit change Δ S
ΔS＝Sx′-Sx
Wherein S'xIs a combined benefit value with an adjacent gas pipe section gas stopping unit SxThe original benefit value of the gas stopping unit of the adjacent gas pipe section is obtained;
respectively stopping the number N 'of users for the merged gas pipeline'xIs judged to be N'xWhether the number of users is greater than the maximum number of users allowed to stop the gas, N ', is selected'xMerging the gas pipe section gas stopping units which are smaller than N and have the maximum delta S; and if the number of the combined gas pipeline gas stopping users is larger than N, removing the gas pipeline from the set B and putting the gas pipeline into a set D, otherwise, remaining the gas pipeline in the original set and repeating the steps until the conditions are met and putting the gas pipeline into the set D.
6. The system of claim 4 or 5, wherein the system comprises: and all the information in the set D is sequentially arranged according to the putting sequence.
7. A computer-readable storage medium characterized by: the computer storage medium stores computer instructions that cause the computer to perform the method of any of claims 1 to 3.
8. A processing apparatus, characterized by: comprising at least one processor and at least one memory communicatively coupled to the processor, wherein the memory stores program instructions executable by the processor, the processor being capable of performing the method of any of claims 1 to 3 using the program instructions.
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