CN105138753B - The determination method of high Pressure Gas Pipeline node actual flow under accident conditions - Google Patents
The determination method of high Pressure Gas Pipeline node actual flow under accident conditions Download PDFInfo
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- CN105138753B CN105138753B CN201510497825.3A CN201510497825A CN105138753B CN 105138753 B CN105138753 B CN 105138753B CN 201510497825 A CN201510497825 A CN 201510497825A CN 105138753 B CN105138753 B CN 105138753B
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Abstract
The present invention provides the determination method of high Pressure Gas Pipeline node actual flow under accident conditions, this method is assumed initially that under accident conditions, respectively it is equal to the design discharge with moral point with the actual flow of moral point in pipe network, Hydraulic Calculating Program is worked out using traditional looping network hydraulic calculation method, pipe network respectively uses moral point pressure under simulated accident operating mode, when the minimum node pressure that can not meet pipe network requirement with moral point pressure of any simulation, gradually decrease the actual flow of minimum pressure node in pipe network system, then moral point pressure is respectively used under simulated accident operating mode again by the way of the successive iteration, untill the useful moral point pressure of institute is satisfied by minimum node pressure demand, now be node actual flow under accident conditions with gas node flow.Beneficial effect is that this method energy science is determined under accident conditions in pipe network respectively with the actual flow of moral point, error 10.54%.
Description
Technical field
The invention belongs to pipeline network of fuel gas in city operation monitoring and source of the gas emergency scheduling field, it is related to city high Pressure Gas Pipeline
Accident conditions under high Pressure Gas Pipeline node actual flow determination method.
Background technology
City high Pressure Gas Pipeline is the sustainer of city gas supply, and urban lifeline engineering, its major function
It is the combustion gas to the enough pressure of all user's transmission ＆ distribution and flow.To ensure network security steady operation, typically according to user's request
Flow by design of pipe networks circlewise.The great advantage of looping network is that have very high back-up capability, be don't bother about when in pipe network
When Duan Fasheng accidents (abbreviation accident conditions) and must isolating from pipe network are overhauled, what is be connected with the accident pipeline section still can be by with moral point
Other paths obtain required flow partially or completely, and are unlikely to that supply interruption occurs, and then improve whole pipe network system
The supply reliability of system.
It has been generally acknowledged that pipe network disclosure satisfy that the function of design requirement in good condition, i.e., respectively with the reality of moral point in pipe network
Border flow disclosure satisfy that the gas quantity of each node demand, i.e., equal to design of node flow.However, under accident conditions, due to individual
No matter the isolation of section may cause the total flow of pipe network system to reduce, and cause the node actual flow of partially or completely user small
In design of node flow.Obviously, influence of the accident to each node actual flow in pipe network occur for same pipeline section different, different
It is also different that influence of the accident to same user occurs for pipeline.
It is the uncertainty of portions flow direction that looping network, which is distinguished with the most fundamental characteristic of branched network, when indivedual
Pipeline section occurs accident and must not only influence the change of other pipeline flows, it is also possible to make to fire in some pipeline sections after pipe network isolation
The flow direction of gas changes, so as to cause answering for the ambiguity of each pipeline section connection in series-parallel relation and pipe network system impedance computation
Polygamy, as increasing for pipe network number of rings is also difficult to conveniently use in parallel ring roadlock force balance principle quantitative analysis pipe network
The actual flow of all nodes, simultaneously because the pass that intercouples of city high Pressure Gas Pipeline interior joint pressure and node flow
System so that under accident conditions, the determination of node actual flow is more complicated.
Therefore, in current gas pipe network accidents performance analysis, the analysis calculation method of generally use simplification is such as existing
Part document thinks pipe network actual node flow still equal to design node flow；Own also in part document hypothetical accident operating mode
The actual node flow of user is declined by same ratio uniform；Separately there is part document to be calculated by design of node flowmeter
The pressure of the node, then using node pressure and the rule-of-thumb relation of node flow, section is calculated by the node pressure calculated
Actual flow of point etc., it is clear that these are all unscientific.Also can not be to pipe network system under accident conditions using existing method
Overall gas supply capacity is rationally assessed, while the gas quantity that respectively can be actually obtained with moral point also can not be determined accurately, be entered
And the science for greatly affecting the emergency disposal schemes such as gas ductwork operation monitoring, source of the gas scheduling is formulated and implemented.
The content of the invention
It is an object of the invention to overcome the shortcomings of in existing method, it is proposed that the high-pressure gas pipe under a kind of accident conditions
Net node actual flow determines method, can calculate under accident conditions that each user can be obtained reality in pipe network scientific quantitative analysis
Gas quantity, to instructing, gas works planning and designing, source of the gas emergency plan are formulated, pipe network operation is dispatched and pipe-line maintenance renewal plan
Deng all having great importance.
The present invention is achieved by the following technical solutions, assumes initially that in looping network respectively with the actual flow of moral point
Design discharge equal to this with moral point, Hydraulic Calculating Program, simulation are worked out using traditional looping network hydraulic calculation method
Pipe network respectively uses moral point pressure under accident conditions, when the minimum that can not meet pipe network requirement with moral point pressure of any simulation
During node pressure, the actual flow of minimum pressure node in pipe network system is gradually decreased, then the weight by the way of successive iteration
Moral point pressure is respectively used under new simulated accident operating mode, is up to the useful moral point pressure of institute is satisfied by minimum node pressure demand
Only, now be with gas node flow user under accident conditions node actual flow.
The present invention effect be：Determined using this method energy science under accident conditions in pipe network respectively with the actual stream of moral point
Amount, and result of calculation complies fully with the hydraulic characteristic and existing engineering reality of looping network, while need not in calculating process
Extra simplification assumed condition, avoids the various un-reasonable phenomenons occurred in the method for existing literature introduction, and advantage is：(1)
In the case where pipe network node pressure is negative value, its node actual flow is still equal to design node flow；(2) the actual stream of node
Amount uniformly declines according to same ratio, and unrelated with node pressure；(3) completely according to existing node pressure and node flow
Semi-empirical relation determines node flow.Using the inventive method, under conditions of any simplified hypothesis is not carried out, it may be determined that certain
Under one accident conditions in pipe network the gas quantity (namely pipe network be capable of supply that total flow) that can obtain of useful moral point be
4393Nm3/h；And use existing literature method, it is assumed that when all node actual flows are unrelated with the node pressure, institute in pipe network
The gas quantity that useful moral point can obtain is 3930Nm3/ h, the error with the inventive method are 10.54%.
Brief description of the drawings
Fig. 1 is the city ring-type high Pressure Gas Pipeline schematic diagram of the embodiment of the present invention；
Fig. 2 is the city ring-type high Pressure Gas Pipeline schematic diagram under accident conditions.
In figure：
I, the first high-pressure gas pipeline section II, the second high-pressure gas pipeline section III, the 3rd high-pressure gas pipeline section IV, the 4th high
Press gas pipeline V, the 5th high-pressure gas pipeline section VI, the 6th high-pressure gas pipeline section VII, the 7th high-pressure gas pipeline section
1st, with moral point 12, with moral point 23, with moral point 34, with moral point 4
5th, with moral point 56, source of the gas node
Q1, with the design discharge Q of moral point 12, with the design discharge of moral point 2
Q3, with the design discharge Q of moral point 34, with the design discharge of moral point 4
Q5, with the design discharge of moral point 5
Q1 avl, with the actual flow Q of moral point 12 avl, with the actual flow of moral point 2
Q3 avl, with the actual flow Q of moral point 34 avl, with the actual flow of moral point 4
Q5 avl, with the actual flow P of moral point 55, source of the gas node 6 node pressure
Embodiment
Method, which is made, to be determined to the high Pressure Gas Pipeline node actual flow under the accident conditions of the present invention below in conjunction with the accompanying drawings
Further illustrate.
High Pressure Gas Pipeline node actual flow under the accident conditions of the present invention determines that method comprises the following steps that：
1. respectively with moral point design discharge Q known tojAnd the pressure of source of the gas node, wherein QjMiddle j=1,2 ... n.Press
Hydraulic pipeline calculation procedure is worked out according to the network topology under serviceable condition, operating mode hydraulic analysis is designed, draws design
The pipe network of operating mode is respectively with the node pressure P of moral pointj 0, wherein Pj 0Middle j=1,2 ... n.
2. when accident occurs for any pipeline section and when isolating from pipe network, it is believed that pipe network the node pressure of useful moral point remain to
Meet the design discharge demand of the node, that is, assume that now pipe network is respectively with the actual flow Q of moral pointj avlEqual to this with moral point
Design discharge Qj。
3. according to hypothesis moral point actual flow Qj avl, the network topology establishment after isolating according to accident pipeline section
Hydraulic pipeline calculation procedure, pipe network is respectively with the pressure P of moral point under simulated accident operating modej；
4. that examines simulation respectively uses moral point pressure PjWhether remain to meet Pj≥Pmin, if satisfied, then illustrating institute in pipe network
There is node pressure to meet pipe network requirement, the reservation for pressure of pipe network is enough to overcome shadow of the accident pipeline section to pipe network system hydraulic regime
Ring, the pipe network under the accident operating mode can respectively be worked with moral point according to the stability of flow of hypothesis, i.e., now respectively with moral point
Actual flow is Qj avl, it is not required to adjust, goes to step 6；
If not satisfied, illustrate that the pipe network under the accident conditions can not be according to hypothesis moral point actual flow Qj avlIt is stable
Work, the node actual flow that need to go to step 5) pair hypothesis are adjusted；
5. finding out the node that pressure is minimum in all nodes of pipe network system using searching algorithm, and make the node gas consumption
Qj avl=0.99 × Qj avl.Then repeat step 3, step 4, until all node pressures are satisfied by the most trifle of pipe network in pipe network
Point pressure requirement.
6. finally obtain with moral point gas consumption Qj avlThe node actual flow of user as under accident conditions, namely thing
Therefore the gas quantity that the user can obtain under operating mode.
Certain city ring-type high Pressure Gas Pipeline as shown in figure 1, the first high-pressure gas pipeline section I, the second high-pressure gas pipeline section II,
3rd high-pressure gas pipeline section III, the 4th high-pressure gas pipeline section IV, the 5th high-pressure gas pipeline section V, the 6th high-pressure gas pipeline section VI,
7th high-pressure gas pipeline section VII is the city high-pressure gas pipeline section that impedance is 1.2, and pipeline section both ends are mounted on valve (in figure
Omit) it to be easy under accident conditions in time from pipe network to isolate and overhauls, it is assumed that the flow direction of each pipeline section combustion gas is as shown by arrows.Just
Under normal operating mode, the pressure of source of the gas node 6 is 4.0MPa, with moral point 1, with moral point 2, with moral point 3, with moral point 4, uses gas
The design discharge of node 5 is 1000Nm3/ h, the minimum pressure needed for each node of pipe network are 2.5MPa.Now determine high second
Pressure gas pipeline II occur accident and after pipe network isolation, respectively with the node actual flow of moral point in pipe network.
Specific steps：
1. each design of node flow Q known toj=1000Nm3(j=1,2 ... 5), according to the pipe network serviceable condition by/h
Under network topology, as shown in figure 1, establishment hydraulic pipeline calculation procedure, carry out nominal situation hydraulic analogy, obtain each use
The node pressure of moral point, as a result as shown in table 1：
Hydraulic analogy result under the nominal situation of table 1
As shown in Table 1, on the premise of design of node flow is met, the useful moral point pressure of pipe network institute is all higher than
2.5MPa, wherein it is minimum with the pressure of moral point 3, it is 2.543MPa, also illustrates that the design of pipe networks scheme can meet design conditions
Under required with gas, i.e., node actual flow now is equal to design of node flow.
2. when accident occurs for pipeline section II and when must isolate from pipe network, it is believed that pipe network the node pressure of useful moral point remain to
Meet the design discharge demand of the node, that is, assume the actual flow Q of now each node of pipe networkj avl=Qj=1000Nm3/ h (j=
1,2,…5)。
3. according to each node actual flow Q of hypothesisj avl=1000Nm3(j=1,2 ... 5), after isolating according to pipeline section II by/h
Network topology, as shown in Fig. 2 establishment hydraulic pipeline calculation procedure, each node in pipe network system under simulated accident operating mode
Node pressure Pj, as a result as shown in table 2：
Hydraulic analogy result during 2 pipeline section II failures of table
4. examine whether each node pressure is satisfied by Pj≥2.5MPa。
As known from Table 2, after the second high-pressure gas pipeline section II breaks down, with moral point 2, with moral point 3, with moral point
4 pressure can not meet the requirement of minimum node pressure, illustrate that the pipe network under the accident conditions can not fully meet hypothesis
Each node actual flow Qj avl=1000Nm3(j=1,2 ... 5), therefore need to go to step 5 and the actual flow of each node is carried out by/h
Adjustment.
5. it is with moral point 2 to find out the minimum node of pressure in all nodes of pipe network system, and the node gas consumption is made
Q2 avl=0.99 × Q2 avl, remaining node flow does not adjust, still using the numerical value of step 3.Then repeat step 3,4, Zhi Daoguan
Untill all node pressures are satisfied by the minimum node pressure 2.5MPa of pipe network in net.
6. the node gas consumption Q finally obtained2 avlAs each node actual flow with moral point, namely under accident conditions
The gas quantity that the user can obtain.
Last result of calculation is as shown in table 3：
During 3 pipeline section II failures of table in pipe network each node node actual flow
As shown in Table 3, pipeline section II failures can cause all node pressures of system to reduce, in order to ensure pipe network normal work,
System can automatically adjust each node actual flow to ensure that pipe network node pressure can meet to require, cause the section with moral point 2
Point actual flow reduce, other node flows are constant, and and not all node flow all uniformly reduce, this also with current reality
Engineering is consistent.
Node actual flow Q i.e. in table 3j avl(j=1,2 ... 5) be under the accident conditions, and moral is respectively used in pipe network
The gas quantity that point can obtain, the total flow that now pipe network is capable of supply that are：1000+393+1000+1000+1000=
4393Nm3/h
As in the present embodiment, using the simplified process method introduced in existing part document, i.e., in hypothetical accident operating mode
The node actual flow of all users is declined by same ratio uniform, and unrelated with node pressure, and its result of calculation is such as
Shown in table 4
The node actual flow calculated during 4 pipeline section II failures of table using existing method
As shown in Table 4, pipeline section II failures and from pipe network isolation after, no matter respectively with moral point pressure whether be more than pipe network requirement
Minimum pressure, all requirements that can not all meet design node flow with moral point actual flow, i.e. node flow subtract
It is unrelated with the size of the node pressure on a small quantity, but uniformly reduced in same ratio, it is clear that this has not met Practical Project feelings
Condition.The total flow that now pipe network is capable of supply that is：786+786+786+786+786=3930Nm3/ h, with the inventive method middle pipe
Net supply total flow (4393Nm3/ h) error be 10.54%.
Claims (1)
1. the high Pressure Gas Pipeline node actual flow under a kind of accident conditions determines method, this method be under accident conditions,
Assume initially that in looping network and to be respectively equal to this with the design discharge of moral point with the actual flow of moral point, utilize traditional ring-type
Hydraulic pipeline computational methods work out Hydraulic Calculating Program, and pipe network respectively uses moral point pressure under simulated accident operating mode, when any mould
When can not meet the minimum node pressure of pipe network requirement with moral point pressure of plan, gradually decrease minimum pressure section in pipe network system
The actual flow of point, then respectively use moral point pressure under simulated accident operating mode again by the way of the successive iteration, up to institute
Untill useful moral point pressure is satisfied by minimum node pressure demand, now be user under accident conditions with gas node flow
Node actual flow；It is as follows that the method comprising the steps of：
1) it is according to looping network under serviceable condition operating mode known to designing pipeline section respectively with moral point design discharge Qj, wherein Qj
Middle j=1,2 ... n, hydraulic pipeline calculation procedure is worked out according to the network topology under serviceable condition, is designed operating mode water
Power is analyzed, and draws the pipe network of design conditions respectively with the node pressure P of moral pointj 0, wherein Pj 0Middle j=1,2 ... n, P nowj 0
The minimum pressure P of pipe network requirement can be met in theorymin, i.e. Pj 0≥Pmin；
2) when accident occurs for any pipeline section of looping network and isolates from pipe network, it is believed that pipe network the pressure of useful moral point remain to
Meet the design discharge demand of the node, that is, assume that now pipe network is respectively with the actual flow Q of moral pointj avl, wherein Qj avlMiddle j=
1,2 ... n, the design discharge Q equal to this with moral pointj；
3) according to hypothesis moral point actual flow Qj avl, the network topology establishment pipe network after isolating according to accident pipeline section
Hydraulic Calculating Program, pipe network is respectively with the pressure P of moral point under simulated accident operating modej；
4) that examines simulation respectively uses moral point pressure PjWhether remain to meet Pj≥Pmin, if satisfied, then illustrating all sections in pipe network
Point pressure meets pipe network requirement, and the reservation for pressure of pipe network is enough to overcome the influence of the accident pipeline section to pipe network system hydraulic regime,
Pipe network under the accident operating mode can respectively be worked with moral point according to the stability of flow of hypothesis, i.e., now respectively with the reality of moral point
Flow is Qj avl, it is not required to adjust, goes to step 6)；
If not satisfied, illustrate that the pipe network under the accident conditions can not be according to hypothesis moral point actual flow Qj avlSteady operation,
The node actual flow that step 5) pair hypothesis need to be continued to is adjusted；
5) node that pressure is minimum in all nodes of pipe network system is found out using searching algorithm, and makes node gas consumption Qj avl=
0.99×Qj avl；Then repeat step 3), 4), until in pipe network all node pressures be satisfied by pipe network minimum node pressure will
Ask；
6) now with moral point gas consumption Qj avlThe node actual flow of user as under accident conditions, namely under accident conditions
The gas quantity that user can obtain.
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Effective date of registration: 20191118 Address after: Room 501-2, building 6, east area, airport business park, 80 Huanhe North Road, Tianjin pilot free trade zone (Airport Economic Zone) Patentee after: Tianjin Taida Binhai Clean Energy Group Co., Ltd. Address before: 300384 No. 26, Jing Jing Road, Xiqing District, Tianjin Patentee before: Tianjin Chengjian University |