CN109064033B - Gas quantity scheduling method for natural gas pipe network - Google Patents
Gas quantity scheduling method for natural gas pipe network Download PDFInfo
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Abstract
The invention relates to a gas quantity scheduling method of a natural gas pipe network, which comprises the following steps: determining the gas storage capacity of the pipeline and making a relation curve between the output of the pipeline and the gas storage capacity; calculating peak shaving demand of each user according to the 24-hour gas consumption plan of each user; calculating the gas storage capacity of the pipe network system according to the pipe network structure, and calculating the peak regulation capacity of the pipe network system according to the gas storage capacity of the pipe network system; obtaining a relation curve of the pipe transmission capacity and the peak regulation capacity of the pipe network system according to the peak regulation capacity of the pipe network system; dividing a relation curve of the pipe transmission quantity and the peak regulation capacity of a pipe network system into a risk peak regulation area, an allowable peak regulation area and an optimized peak regulation area to form three boundary curves for production scheduling, air source arrangement and market arrangement. The invention can balance the gas quantity scheduling relation among the gas supply capacity of the gas source, the peak regulation gas demand of the user and the gas transmission capacity of the pipe network.
Description
Technical Field
The invention relates to a gas quantity scheduling method for a natural gas pipe network, and belongs to the technical field of natural gas pipelines or natural gas pipe networks.
Background
With the vigorous development of the natural gas industry, the continuous acceleration of the construction of natural gas pipelines, the continuous formation and expansion of national-grade natural gas main pipe networks, the increase of natural gas users and the increase of the hourly peak regulation requirements of large natural gas users, particularly peak regulation users, in local areas, under the condition that the gas peak regulation facilities for user terminals are seriously insufficient, the rapidly increased natural gas deep peak regulation demand users put forward higher and higher requirements and technical challenges on the operation and the dispatching of the existing natural gas pipeline facilities.
The scheduling method for processing the gas quantity of the natural gas pipe network in the prior art mainly comprises three methods: firstly, real-time calculation parallel to actual production data and 'forward looking' according to the requirement of a scheduling scheme are carried out through an online simulation system; however, the method is only used in a small amount in the actual production, has high technical requirements on production scheduling personnel, and relates to the noise reduction processing of a large amount of online real-time data, although the technical method is the best, the practical use effect is limited due to higher use difficulty, and even the situation that the method cannot be used can occur; secondly, empirical judgment is carried out based on pressure-pipe volume change data (coefficient) obtained from production experience by production scheduling personnel, but jumping judgment cannot be carried out when the requirements of an air source and a user prove to be greatly changed, and the accuracy basis is lacked; and thirdly, working condition calculation is carried out through offline simulation software, the problems are concentrated on that the calculated baseline is far away from the production state, and the offline calculation workload is overlarge, so that the requirements of various working condition changes in the production practice are often difficult to meet. These problems all result in too conservative scheduling in production operation, and cannot meet the requirement of users for large gas consumption and load change, and gas transmission pipeline operators often lose opportunities for increasing gas transmission and increasing income.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a gas flow scheduling method for a natural gas pipeline network, which can balance the gas flow scheduling relationship among the gas supply capacity of a gas source, the peak shaving gas demand of a user, and the gas delivery capacity of the pipeline network.
In order to achieve the purpose, the invention adopts the following technical scheme: a gas quantity scheduling method for a natural gas pipe network comprises the following steps: 1) determining the gas storage capacity of the pipeline and making a relation curve between the output of the pipeline and the gas storage capacity; 2) calculating peak shaving demand of each user according to the 24-hour gas consumption plan of each user; 3) calculating the gas storage capacity of the pipe network system according to the pipe network structure, and calculating the peak regulation capacity of the pipe network system according to the gas storage capacity of the pipe network system; 4) obtaining a relation curve of the pipe transmission capacity and the peak regulation capacity of the pipe network system according to the peak regulation capacity of the pipe network system with different pipe transmission capacities, and performing production scheduling, gas source arrangement and market arrangement; 5) according to the principles of safety, reliability and high efficiency of pipe network operation, a relation curve of pipe transmission quantity and peak regulation capacity of a pipe network system is divided into a risk peak regulation area, an allowable peak regulation area and an optimized peak regulation area to form three boundary curves, so that balanced gas quantity scheduling is realized.
Further, in the step 1), under the determined pipe network structure, the working conditions to be analyzed are classified according to seasons, pipeline attributes and user configuration, one reference working condition is selected under each type of working conditions, and the gas storage capacity of the pipeline per se under different output is calculated.
Further, the calculation formula of the gas storage capacity of the pipeline per se is as follows:
wherein, VmaxThe gas pipe stock of the pipeline at the end of the gas storage state is m3；VminThe gas pipe stock of the pipeline at the beginning of the gas storage state is m3；ppjmaxThe average pressure of the pipeline at the end of the gas storage state is Pa; p is a radical ofpjminThe average pressure of the pipeline at the beginning of the gas storage state is Pa; p is a radical of1maxThe starting point is the maximum allowable pressure in Pa; p is a radical of2minThe lowest allowable pressure at the end point is expressed in Pa; vgIs the geometric volume of the pipeline, and has the unit of m3(ii) a l is the length of the pipeline in m; d is the inner diameter of the pipeline and the unit is m; q is the volume flow of gas in the pipeline under standard conditions, and the unit is m3/s；Z1、Z2Respectively the average pressure and the compression factor at the average temperature at the beginning and the end of gas storage, and approximately considering Z1＝Z2＝Z；T1、T2The average temperature at the beginning and the end of gas storage are respectively considered as T1＝T2T, in K; p is a radical of0Pressure under engineering standard conditions, p0＝101325Pa；Z0Is P0，T0Compression factor of, Z0＝1；T0Is the temperature under engineering standard conditions, T0293K; lambda is the hydraulic friction coefficient; delta*Is the relative density of natural gas. VSIs the corresponding gas storage capacity of the pipeline under the output Q, and the unit is m3；C0Is constant, 0.03848.
Further, in step 2), the calculation formula of the peak shaving demand of the user is as follows:
in the formula, V is the daily peak regulation demand of a downstream user under a certain working condition, ten thousand square/day; n represents n natural gas users along the pipeline; i represents a user along the pipeline; j represents an hour time within 24 hours of the day; q. q.sjThe gas consumption of the user i in the jth hour is ten thousand squares/hour;
the daily average hourly gas consumption of the user i is ten thousand square/hour.
Further, in the step 3), a calculation formula of the peak shaving capacity of the pipe network system is as follows:
in the formula, QGeneral assemblyThe total daily output of all users in the pipeline is ten thousand square/day; qiThe daily output of the user i, ten thousand square/day; v0The peak regulation capacity of the pipe network system is ten thousand square/day.
Further, in the step 4), the relationship curves of the pipe transmission capacity and the system peak regulation capacity of different pipe network systems are different, the relationship curves show the matching interval of the pipe transmission capacity and the peak regulation capacity, which can be safely operated by the pipe network system, and the downstream market demand range which can be satisfied by the pipe network system is judged according to the interval to carry out production scheduling, gas source arrangement and market arrangement.
Further, in the step 5), the risk peak-shaving boundary line is calculated by 95% of the peak-shaving capacity of the pipe network system, namely 95% V0Allowable peak regulation boundary line at 90% V0The target peak regulation boundary line is calculated as 85% V0Counting; the peak regulation partition range of the relation curve of the pipe output and the peak regulation capacity is adjusted according to the actual running condition of the pipe network.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention combines the actual operation data of the pipe network, calculates the boundary curve of the pipe output and the peak load regulation for the natural gas pipe network, and provides reliable basis for natural gas pipe network operation enterprises to reasonably regulate and control the pipe output parameters, master the gas quantity scheduling range and control the safe operation risk: as long as the pipeline capacity is satisfied within the boundary curve range of the output and peak load, the safety is also allowed. 2. The method has wide applicability, solves the problems that a pipe network operation enterprise is tired of coping with the large change of the gas utilization rule of users, the technical accounting time period is long, and the balance processing of the simulation computation result and the pipeline operation safety margin is difficult to accurately master, and can master the change of the actual conveying capacity of the pipeline in real time.
Drawings
FIG. 1 is a schematic diagram showing the relationship between the natural gas pipe network output and the peak regulation capacity;
FIG. 2 is a schematic diagram of a natural gas pipeline network system peak shaving zone;
fig. 3 is a diagram of peak shaving zones of a pipe network system.
Detailed Description
The invention provides a gas quantity scheduling method of a natural gas pipe network, which combines actual operation data of the pipe network, calculates a boundary curve of pipe output quantity and peak load regulation quantity for the natural gas pipe network, and provides reliable basis for natural gas pipe network operation enterprises to reasonably regulate and control pipe output parameters, grasp a gas quantity scheduling range and control safe operation risks. The invention is described in detail below with reference to the figures and examples.
The method is a method for scheduling the gas quantity of a single-gas-source natural gas pipe network under the condition that a gas source does not participate in peak shaving, and comprises the following steps:
1) under the determined pipe network structure, the working conditions to be analyzed are classified according to conditions such as seasons, pipeline attributes, user configuration and the like, a reference working condition is selected under each type of working conditions, the gas storage capacity of the pipeline per se under different output quantities is calculated, and a relation curve between the output quantity of the pipe and the gas storage capacity is made.
The calculation formula of the gas storage capacity of the pipeline per se is as follows:
wherein, VmaxThe gas pipe stock of the pipeline at the end of the gas storage state is m3；VminThe gas pipe stock of the pipeline at the beginning of the gas storage state is m3；ppjmaxThe average pressure of the pipeline at the end of the gas storage state is Pa; p is a radical ofpiminThe average pressure of the pipeline at the beginning of the gas storage state is Pa; p is a radical of1maxThe starting point is the maximum allowable pressure in Pa; p is a radical of2minThe lowest allowable pressure at the end point is expressed in Pa; vgIs the geometric volume of the pipeline, and has the unit of m3(ii) a l is the length of the pipeline in m; d is the inner diameter of the pipeline and the unit is m; q is the volume flow of gas in the pipeline under standard conditions, and the unit is m3/s；Z1、Z2Respectively, the average pressure and the compression factor at the average temperature at the beginning and the end of gas storage, and can be approximately considered as Z1＝Z2＝Z；T1、T2The average temperature at the beginning and end of gas storage can be approximated as T1＝T2T, in K; p is a radical of0Pressure under engineering standard conditions, p0＝101325Pa；Z0Is P0，T0Compression factor of, Z0＝1；T0Is the temperature under engineering standard conditions, T0293K; lambda is the hydraulic friction coefficient; delta*Is the relative density of natural gas. VSIs the corresponding gas storage capacity of the pipeline under the output Q, and the unit is m3；C0Is constant, 0.03848.
2) Calculating peak shaving demand of each user according to the 24-hour gas consumption plan of each user;
the calculation formula of the peak regulation demand of the user is as follows:
in the formula, V is the daily peak regulation demand of a downstream user under a certain working condition, ten thousand square/day; n represents n natural gas users along the pipeline; i represents a user along the pipeline; j represents an hour time within 24 hours of the day; q. q.sjThe gas consumption of the user i in the jth hour is ten thousand squares/hour;
the daily average hourly gas consumption of the user i is ten thousand square/hour.
3) Calculating the gas storage capacity of the pipe network system according to the pipe network structure, and calculating the peak regulation capacity of the pipe network system according to the gas storage capacity of the pipe network system;
the peak regulation capacity calculation formula of the pipe network system is as follows:
in the formula, QGeneral assemblyThe total daily output of all users in the pipeline is ten thousand square/day; qiThe daily output of the user i, ten thousand square/day; v0The peak regulation capacity of the pipe network system is ten thousand square/day.
4) Considering factors such as different seasons, power plant operation mode combination and the like, obtaining a relation curve of the pipe transmission capacity and the peak regulation capacity of the pipe network system according to the peak regulation capacity of the pipe network system with different pipe transmission capacities, and performing reasonable production scheduling, gas source arrangement and market arrangement;
as shown in fig. 1 (without compressor), where a, b, c represent various combinations of locations of multiple peak shaving power plants downstream of the pipeline; va represents a relation curve of pipe transportation quantity and peak regulation capacity when a downstream peak regulation power plant operates in a combined mode; vas and Vaw represent the relationship curves of pipe transportation and peak shaving capacity in summer and winter when the downstream peak shaving power plants operate in a combination. The relation curves of the pipe transmission capacity and the system peak regulation capacity of different pipe network systems are different, the trend and the appearance of the curve can be different aiming at the pipe network in actual operation, the relation curve shows the matching interval of the pipe transmission capacity and the peak regulation capacity, which can be safely operated by the pipe network system, and the downstream market demand range which can be satisfied by the pipe network system is judged according to the interval, so that reasonable production scheduling, air source arrangement and market arrangement are carried out.
5) According to the principles of safety, reliability and high efficiency of pipe network operation, dividing a relation curve of pipe transmission quantity and peak regulation capacity of a pipe network system into a risk peak regulation area, an allowable peak regulation area and an optimized peak regulation area to form three boundary curves so as to realize balanced gas quantity scheduling;
the risk peak regulation boundary line is calculated by 95 percent of the peak regulation capacity of the pipe network system, namely 95 percent V0Allowable peak regulation boundary line at 90% V0The target peak regulation boundary line is calculated as 85% V0And (6) counting. The peak regulation partition range of the relation curve of the pipe output and the peak regulation capacity can be adjusted according to the actual operation condition of the pipe network (as shown in figure 2).
Wherein:
example (b):
the rationality and feasibility of the actual operation condition of a certain pipe network are evaluated by adopting the gas quantity scheduling method. According to the actual condition of the pipe network, the structural characteristics of the pipe network, the peak regulation requirements of users and boundary conditions are comprehensively considered, 9 common working conditions are evaluated, and the evaluation results are compared with the software accounting results, so that consistency is achieved, the reliability of the technology is verified, and the scheduling technology can provide a basis for scheduling management decision of pipelines.
1. Peak shaving demand in the market
For common gas combinations of downstream users, 9 working conditions are arranged, and the pipeline gas transmission quantity and the peak regulation demand condition of the downstream users under the 9 working conditions are shown in table 1.
User gas demand under 19 working conditions of table
2. Calculation of gas storage capacity of pipe network system
The starting point pressure is not higher than 8.5MPaG, the tail end pressure is not lower than 4.7MPaG, under the boundary condition, the output of the user at the worst point of the whole line is gradually changed, and a series of highest pipe storage capacity, lowest pipe storage capacity and gas storage capacity corresponding to different pipe output capacities are calculated. The calculation results are shown in table 2.
TABLE 2 gas storage capacity of pipelines at different pipe transportation volumes
| Amount of supplied air | High management storage | Low pipe storage | Gas storage capacity |
| All directions/day | Wanfang | Wanfang | Wanfang |
| 1209.6 | 522.79 | 472.77 | 50.02 |
| 1036.8 | 558.00 | 439.62 | 118.38 |
| 864.0 | 585.58 | 409.48 | 176.10 |
| 691.2 | 606.97 | 382.99 | 223.98 |
| 432.0 | 629.15 | 351.84 | 277.30 |
| 172.8 | 640.72 | 333.69 | 307.03 |
3. Pipe network peak regulation subarea
As shown in fig. 3, the safety and reliability of the pipe network operation scheduling under 9 operating conditions are evaluated according to the gas storage capacity of the pipe network under different pipe transmission capacities and the peak regulation partition principle provided by the present invention.
The point corresponding to the pipe transmission amount and the peak shaving demand amount of the working conditions 3 and 6 is located on the curve V3, that is, the peak shaving demand amount of the working conditions exceeds the highest safe peak shaving amount which can be provided by the pipe network, and the pipe transmission system cannot guarantee the safe operation of the working conditions under the current boundary conditions.
The point corresponding to the pipe transmission amount and the peak regulation demand amount under the working condition 1 is located between the curves V2 and V3, namely the working condition is located in the risk peak regulation area of the pipe network, exceeds the highest allowable peak regulation curve and is lower than the highest safe peak regulation curve, and the pipe transmission system can guarantee the safe operation of the working condition under the current boundary condition.
The point corresponding to the pipe transmission amount and the peak regulation demand of the working condition 4 is located between the curves V1 and V2, namely the working condition is located in the allowed peak regulation area of the pipe network, exceeds the highest target peak regulation curve and is lower than the highest allowed peak regulation curve, and the pipe transmission system can guarantee the reliable operation of the working condition under the current boundary condition.
The points corresponding to the pipe transmission quantity and the peak regulation demand quantity of other working conditions are all located below the curve V1, namely the working conditions are located in the target peak regulation area of the pipe network and are lower than the highest target peak regulation curve, and the pipe transmission system can guarantee efficient operation of the working conditions under the current boundary conditions.
4. Software simulation results
The natural gas long-distance pipeline simulation software SPS of DNV GL company is adopted to carry out accounting on the working conditions 1-9, the evaluation results of the 9 working conditions are compared with the software simulation results, and the results are consistent, so that the gas quantity scheduling method provided by the invention has strong reliability and practicability.
The above embodiments are only used for illustrating the present invention, and the implementation steps of the method and the like can be changed, and all equivalent changes and modifications based on the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (3)
1. A gas quantity scheduling method of a natural gas pipe network is characterized by comprising the following steps:
1) determining the gas storage capacity of the pipeline and making a relation curve between the output of the pipeline and the gas storage capacity;
2) calculating peak shaving demand of each user according to the 24-hour gas consumption plan of each user;
3) calculating the gas storage capacity of the pipe network system according to the pipe network structure, and calculating the peak regulation capacity of the pipe network system according to the gas storage capacity of the pipe network system;
4) obtaining a relation curve of the pipe transmission capacity and the peak regulation capacity of the pipe network system according to the peak regulation capacity of the pipe network system with different pipe transmission capacities, and performing production scheduling, gas source arrangement and market arrangement;
5) according to the principles of safety, reliability and high efficiency of pipe network operation, dividing a relation curve of pipe transmission quantity and peak regulation capacity of a pipe network system into a risk peak regulation area, an allowable peak regulation area and an optimized peak regulation area to form three boundary curves so as to realize balanced gas quantity scheduling;
in the step 1), under a determined pipe network structure, classifying the working conditions to be analyzed according to seasons, pipeline attributes and user configuration, selecting a reference working condition under each type of working conditions, and calculating the gas storage capacity of the pipeline per se under different output quantities;
the calculation formula of the gas storage capacity of the pipeline per se is as follows:
wherein, VmaxThe gas pipe stock of the pipeline at the end of the gas storage state is m3；VminThe gas pipe stock of the pipeline at the beginning of the gas storage state is m3；ppjmaxThe average pressure of the pipeline at the end of the gas storage state is Pa; p is a radical ofpjminThe average pressure of the pipeline at the beginning of the gas storage state is Pa; p is a radical of1maxThe starting point is the maximum allowable pressure in Pa; p is a radical of2minThe lowest allowable pressure at the end point is expressed in Pa; l is the length of the pipeline in m; d is the inner diameter of the pipeline and the unit is m; q is the volume flow of gas in the pipeline under standard conditions, and the unit is m3/s；Z1、Z2The compression factors are respectively the average pressure and the average temperature at the beginning and the end of gas storageSub, approximately consider Z1＝Z2＝Z；T1、T2The average temperature at the beginning and the end of gas storage are respectively considered as T1＝T2T, in K; p is a radical of0Pressure under engineering standard conditions, p0＝101325Pa；T0Is the temperature under engineering standard conditions, T0293K; lambda is the hydraulic friction coefficient; delta*Is the relative density of natural gas; vSThe corresponding gas storage capacity of the pipeline under the gas volume flow Q under the standard condition is expressed in m3；C0Constant, 0.03848;
in the step 2), a calculation formula of the peak shaving demand of the user is as follows:
in the formula, V is the daily peak regulation demand of a downstream user under a certain working condition, ten thousand square/day; n represents n natural gas users along the pipeline; i represents a user along the pipeline; j represents an hour time within 24 hours of the day; q. q.sjThe gas consumption of the user i in the jth hour is ten thousand squares/hour;
the daily average hourly gas consumption of the user i is ten thousand square/hour;
in the step 3), the calculation formula of the peak regulation capacity of the pipe network system is as follows:
in the formula, QGeneral assemblyThe total daily output of all users in the pipeline is ten thousand square/day; qiThe daily output of the user i, ten thousand square/day; v0The peak regulation capacity of the pipe network system is ten thousand square/day.
2. The method of claim 1, wherein: in the step 4), the relationship curves of the pipe transmission capacity and the system peak regulation capacity of different pipe network systems are different, the relationship curves show the matching interval of the pipe transmission capacity and the peak regulation capacity, which can be safely operated by the pipe network system, and the downstream market demand range which can be satisfied by the pipe network system is judged according to the interval to carry out production scheduling, gas source arrangement and market arrangement.
3. The method of claim 1 or 2, wherein: in the step 5), the risk peak regulation boundary line is calculated by 95% of the peak regulation capacity of the pipe network system, namely 95% V0Allowable peak regulation boundary line at 90% V0The target peak regulation boundary line is calculated as 85% V0Counting; the peak regulation partition range of the relation curve of the pipe output and the peak regulation capacity is adjusted according to the actual running condition of the pipe network.
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