CN111928122B - Method and system for scheduling peak shaving capacity of external transmission pipeline matched with LNG receiving station - Google Patents
Method and system for scheduling peak shaving capacity of external transmission pipeline matched with LNG receiving station Download PDFInfo
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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Abstract
The invention relates to a method and a system for scheduling peak shaving capacity of an external transmission pipeline matched with an LNG receiving station, wherein the method comprises the following steps: judging whether the gas consumption requirement of downstream users can be met by a combined peak regulation mode of the LNG receiving station and a matched external transmission pipeline; determining an initial output scheme; and correcting the output volume of certain hours to determine the output scheme which finally meets the requirements of the user. Under the condition that the LNG receiving station and the matched external transmission pipeline face the increasing of the gas consumption and the peak load of downstream users, the reasonable external transmission scheme of the LNG receiving station can be quickly obtained, so that the peak load capacity of the matched pipeline is maximized, and the receiving station is kept to stably run as much as possible, so that the gas consumption requirement of the downstream users is met. The method can be widely applied to the technical field of natural gas pipeline peak shaving scheduling operation.
Description
Technical Field
The invention relates to the technical field of natural gas pipeline peak regulation scheduling operation, in particular to a scheduling method and a system for the peak regulation capacity of an external transmission pipeline matched with an LNG receiving station.
Background
With the continuous improvement of the proportion of natural gas in primary energy consumption, the construction of the LNG receiving station and the matched natural gas pipeline thereof is rapidly developed, and the guarantee of safe, reliable and stable operation of the LNG receiving station and the matched pipeline becomes one of the important working targets of pipeline operation units. Operators of a plurality of LNG receiving stations matched with export pipelines continue to expand downstream markets after project investment, and along with the continuous increase of downstream users, the gas consumption and peak regulation demand of the users are always larger and larger, so that the stable operation of the LNG receiving stations is directly influenced. Therefore, the LNG receiving station and the matched external transmission pipeline need to be considered comprehensively, the external transmission capacity of the LNG receiving station is reasonably arranged and scheduled, and the peak regulation capacity of the matched pipeline of the LNG receiving station is maximized, so that the LNG receiving station can run as stably as possible on the premise of meeting the demand of downstream user gas consumption as much as possible.
The existing peak regulation modes of the LNG receiving station and the external transmission pipeline thereof mainly comprise two modes: firstly, the receiving station is only responsible for adjusting to the day peak, hour peak regulation is undertaken by the pipeline completely, the defeated volume of exporting every hour of LNG receiving station in the peak day 24 hours of using gas is a stable value promptly, the peak regulation ability of pipeline has just guaranteed the even running of LNG receiving station to the maximize of this kind of peak regulation mode, but require the pipeline to have sufficient pipe capacity in order to satisfy downstream user's hour peak regulation demand, along with downstream user's increase and the increase of using gas volume, this mode often can't satisfy the peak regulation demand, need adjust the defeated operating mode of exporting of LNG receiving station. Secondly, the LNG receiving station and the pipeline share the hour peak regulation, the output of the LNG receiving station can be timely adjusted according to the general gas consumption characteristic of the downstream user, the gas consumption requirement of the downstream user is met while the peak regulation capacity of the pipeline is fully exerted, however, no clear and uniform regulation is provided for adjusting the hour output of the LNG receiving station according to the general gas consumption characteristic of the downstream user, usually, the calculation and prediction can be performed only by operators according to experience and a gas pipeline process calculation formula aiming at specific problems, and the efficiency is low.
The traditional LNG receiving station and matched pipeline combined peak regulation scheduling method 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, but the method is only used in a small amount in actual production, has high technical requirements on production scheduling personnel, relates to 'noise reduction' treatment of online large amount of real-time data, and has high operation difficulty and limited actual effect; 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 air source and the user have large demand change, and the accuracy basis is lacked; thirdly, a feasible scheme is obtained through offline simulation software working condition trial calculation, but the problem is concentrated on the fact that a large number of possible combinations exist in the output scheme of the receiving station, and the receiving station provided with N gasification output production lines is taken as an example, and (N +1) may exist in total all the day24The difficulty to be solved urgently is how to quickly and efficiently determine the output scheme capable of meeting the gas consumption requirement of downstream users under the condition of seed output, and the traditional methodThe formula can only be calculated by trial according to the experience of production personnel, the efficiency is low, and the receiving station and the pipeline operator often lose the opportunity of further expanding the downstream market and improving the income.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a scheduling method and system for fully exerting peak shaving capability of an external transmission pipeline matched with an LNG receiving station, which can quickly obtain a reasonable external transmission scheme of the LNG receiving station under the condition that the LNG receiving station and the external transmission pipeline are facing to the increasing of gas consumption and peak shaving amount of downstream users, thereby maximally exerting the peak shaving capability of the matched pipeline and keeping the receiving station to operate stably as much as possible, so as to meet the gas consumption requirement of the downstream users.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for scheduling peak shaving capacity of an external transmission pipeline matched with an LNG receiving station comprises the following steps: 1) judging whether the gas consumption requirement of downstream users can be met by a combined peak regulation mode of the LNG receiving station and a matched external transmission pipeline; 2) determining an initial output scheme; 3) and correcting the output volume of certain hours to determine the output scheme which finally meets the requirements of the user.
Further, in the step 1), the judging method is as follows: the method comprises the steps of setting the output pressure of an LNG receiving station as the highest allowable output pressure constant pressure output, setting downstream users according to respective gas use characteristics, calculating whether the lowest gas receiving pressure of each downstream user within 24 hours of a gas use peak day meets the gas use pressure requirement of each downstream user through hydraulic simulation, and if so, considering that the gas use requirement of the downstream users is met in a combined peak regulation mode.
Further, in the step 2), setting an initial export scheme according to the total gas consumption characteristics of the downstream users means that the export mode of the receiving station is distributed according to the total gas consumption of the downstream users, the peak gas consumption day is divided into a plurality of time periods with different export volumes in 24 hours, the time periods with different export volumes are not more than 2, the export volumes per hour in each time period are equal to the hour average value of the total gas consumption of the users in the time period.
Further, the method for determining the initial output scheme comprises the following steps:
2.1) dividing different output time periods according to the general gas use characteristics of downstream users 24 hours in a peak gas use day;
2.2) determining the high peak value and the low peak value of the total gas volume of the downstream users within 24 hours of the peak day, and recording the difference between the high peak value and the low peak value as delta Q;
2.3) starting from point 0, if the absolute value | Q of the difference between the gas consumption at any of the i-th hour and the i +1 th houri+1-QiIf the number of the output time periods exceeds 2, the segmentation points with larger difference of gas consumption are reserved;
and 2.4) the hourly output volume in each output period is equal to the hourly average value of the total consumption of downstream users in the period, and if the initial scheme meets the gas consumption requirement of the users, the initial scheme is the final scheme.
Further, the step of correcting the certain hourly output volumes means that, if the initial scheme cannot meet the gas consumption requirement of the downstream user, the hourly output volumes in each time period are adjusted according to different proportions of the hourly output volumes in different time periods on the basis of the initial scheme to determine a final output working condition capable of meeting the gas consumption requirement of the downstream user.
Further, the average hour output in each output period is adjusted, the adjustment principle is changed in a mode that the proportion of the hour output in the 1 st period to the hour output in the 2 nd period is 1:2, 1:3, …, 1 (N-1) and 1: N in sequence, wherein N is the number of gasification output production lines.
A dispatching system for fully exerting peak shaving capacity of an external transmission pipeline matched with an LNG receiving station comprises: the device comprises a judgment module, an initial scheme determination module and an output scheme determination module;
the judgment module is used for judging whether the gas consumption requirement of a downstream user can be met by the combined peak regulation mode of the LNG receiving station and the matched external transmission pipeline;
the initial scheme determining module is used for determining an initial output scheme;
and the output scheme determining module corrects the output volume in certain hours and determines the output scheme which finally meets the requirements of the user.
Further, in the determination module, the determination method is: the method comprises the steps of setting the output pressure of an LNG receiving station as the highest allowable output pressure constant pressure output, setting downstream users according to respective gas use characteristics, calculating whether the lowest gas receiving pressure of each downstream user within 24 hours of a gas use peak day meets the gas use pressure requirement of each downstream user through hydraulic simulation, and if so, considering that the gas use requirement of the downstream users is met in a combined peak regulation mode.
Further, in the initial scheme determining module, an initial export scheme is set according to the downstream user total gas usage characteristics, that is, the export mode of the receiving station is distributed according to the total gas usage of the downstream users, 24 hours in a peak gas usage day is divided into a plurality of time periods with different export volumes, the time periods with different export volumes are not more than 2, the export volumes per hour in each time period are equal to the hour average value of the total gas usage of the users in the time period.
Further, in the export scheme determining module, the correcting the certain hourly export volumes means that, if the initial scheme cannot meet the gas consumption requirement of the downstream user, the hourly export volumes in each time period are adjusted according to different proportions of the hourly export volumes in different time periods on the basis of the initial scheme to determine a final export working condition that can meet the gas consumption requirement of the downstream user.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention can fully exert the peak regulation capacity of the pipeline in the mode of peak regulation by combining the LNG receiving station and the matched external transmission pipeline, and simultaneously, the LNG receiving station can operate as stably and conveniently as possible. 2. The method can ensure that the operation management personnel of the LNG receiving station and the matched pipeline can efficiently and accurately determine the output dispatching operation scheme meeting the requirements of downstream users under the condition that the gas consumption and peak load of the downstream users are larger and larger, and reasonably arrange the production operation of the LNG receiving station and the matched pipeline. 3. The method is based on a hydraulic simulation system, automatically calls the peak daily gas volume data of downstream users in the GMS (gas management system) of the LNG receiving station, feeds back a feasible result obtained by simulation to the DCS (distributed control system), and directly guides the external transportation operation of the LNG receiving station.
Drawings
FIG. 1 is a flow chart of the method 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 of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in fig. 1, the present invention provides a scheduling method for fully exerting peak shaving capability of an external transmission pipeline matched with an LNG receiving station, which relates to a combined peak shaving scheduling operation of the LNG receiving station and the external transmission pipeline matched with the LNG receiving station, and specifically includes the following steps:
1) judging whether the gas consumption requirement of downstream users can be met by a combined peak regulation mode of the LNG receiving station and a matched external transmission pipeline;
the judging method comprises the following steps: calling user gas consumption data from a GMS system, setting the output pressure of an LNG receiving station as the highest allowable output pressure constant-pressure output, setting downstream users according to respective gas consumption characteristics, calculating whether the lowest gas receiving pressure of each downstream user within 24 hours of a gas consumption peak day meets the requirement of the gas consumption pressure of each downstream user through hydraulic simulation, and if so, considering that the gas consumption requirement of the downstream users is met in a combined peak regulation mode.
According to the hydraulic simulation result, if the output working condition can not meet the requirements of downstream users, the combined peak shaving mode can not meet the requirements of the users, and only the gas consumption of the users can be reduced; if the working condition meets the gas consumption requirement of the downstream user, the next step can be carried out;
2) determining an initial output scheme;
setting a reasonable initial output scheme according to the general gas consumption characteristics of downstream users, namely distributing the output mode of a receiving station according to the total gas consumption of the downstream users, dividing the peak gas consumption day for 24 hours into a plurality of time periods with different output, wherein the time periods with different output are not more than 2, the output per hour in each time period is equal to the hour average value of the total gas consumption of the users in the time period.
The method comprises the following specific steps:
2.1) dividing different output time periods according to the characteristics of the total gas consumption of downstream users in 24 hours of a peak gas consumption day, wherein the output time periods generally comprise integer hours and the total time period number in 24 hours is not more than 2;
2.2) determining the high peak value and the low peak value of the total gas volume of the downstream users within 24 hours of the peak day, and recording the difference between the high peak value and the low peak value as delta Q;
2.3) starting from point 0, if the absolute value | Q of the difference between the gas consumption at any of the i-th hour and the i +1 th houri+1-QiIf | is greater than Δ Q/2, then the segmentation points for the export period need to be added between two hours, and if the number of export periods exceeds 2, then the segmentation points with larger difference in gas usage are retained first.
2.4) the hourly output volume in each output time interval is equal to the hourly average value of the total consumption of downstream users in the time interval, if the initial scheme meets the gas consumption requirement of the users, the initial scheme is the final scheme, and if the requirement is not met, the next step is carried out;
3) correcting the output volume in certain hours, and determining an output scheme which finally meets the requirements of the user;
the step of correcting the output volume in some hours means that if the initial scheme cannot meet the gas demand of the downstream users, the output volume in hours in each time period is adjusted according to different proportions of the output volume in hours in different time periods on the basis of the initial scheme so as to determine the final output working condition capable of meeting the gas demand of the downstream users.
Wherein, the average hour output in each output time period is adjusted, the adjustment principle is changed in the way that the ratio of the hour output in the 1 st time period to the hour output in the 2 nd time period is 1:2, 1:3, …, 1 (N-1) and 1: N in sequence, wherein N is the number of gasification output production lines.
Taking the output ratio of two output periods as 1: N as an example, Q is the total gas consumption of downstream users in a peak day, the 1 st period comprises h hours, the hour output is Q/[ h + Nx (24-h) ], the hour output is NxQ/[ h + Nx (24-h) ], and the final reasonable output scheme can be determined by carrying out trial calculation on N-1 times at most.
In the above steps, the time division and the setting of the output quantity ratio of different time periods are all described as examples, and any method of changing the time division quantity or the output ratio value independently should be considered as falling within the scope of the innovative point of the patent protection of the present invention.
In the steps, a hydraulic simulation system is utilized to automatically call the gas consumption data of downstream users in the peak day of the GMS system of the LNG receiving station, automatically set and simulate the gas consumption data, and after a final feasible scheme is obtained, the outgoing data signal of the dispatching scheme is automatically transmitted to the DCS system of the LNG receiving station, so that the starting and stopping operation of the gasification outgoing production line is realized.
The invention also provides a dispatching system for fully exerting the peak regulation capacity of the external transmission pipeline matched with the LNG receiving station, which comprises a judgment module, an initial scheme determination module and an external transmission scheme determination module;
the judgment module is used for judging whether the gas consumption requirement of a downstream user can be met by the combined peak regulation mode of the LNG receiving station and the matched external transmission pipeline;
the initial scheme determining module is used for determining an initial output scheme;
and the output scheme determining module corrects the output volume in certain hours and determines the output scheme which finally meets the requirements of the user.
In the above embodiment, in the determining module, the determining method is: the method comprises the steps of setting the output pressure of an LNG receiving station as the highest allowable output pressure constant pressure output, setting downstream users according to respective gas use characteristics, calculating whether the lowest gas receiving pressure of each downstream user within 24 hours of a gas use peak day meets the gas use pressure requirement of each downstream user through hydraulic simulation, and if so, considering that the gas use requirement of the downstream users is met in a combined peak regulation mode.
In the above embodiment, in the initial scheme determining module, the setting of the initial export scheme according to the downstream user total gas usage characteristics means that the export manner of the receiving station is distributed according to the total gas usage of the downstream users, the peak gas usage day is divided into a plurality of time periods with different export volumes in 24 hours, the time periods with different export volumes are not more than 2, the export volumes per hour in each time period are equal to the average hourly value of the total gas usage of the users in the time period.
In the above embodiment, the step of correcting some hourly output volumes in the output scheme determining module means that, if the initial scheme cannot meet the gas consumption requirement of the downstream user, the hourly output volumes in each time period are adjusted according to different proportions of the hourly output volumes in different time periods on the basis of the initial scheme to determine the final output working condition that can meet the gas consumption requirement of the downstream user.
In conclusion, the invention improves the efficiency of production operators to arrange a reasonable export scheduling scheme under the condition that the gas consumption and peak load of downstream users of the LNG receiving station are continuously increased. The method is based on hydraulic simulation analysis, a more reasonable initial output scheme is quickly determined according to the general gas consumption characteristics of the downstream users, and the output scheduling scheme which finally meets the gas consumption requirements of the downstream users can be determined by carrying out a small amount of trial calculation on the basis of the initial scheme.
Example (b):
as known, the maximum allowable export pressure of a certain LNG receiving station is 9MPa, and 5 gasification export production lines are arranged. The supporting pipeline has the diameter phi 660 of 120km, the lowest gas pressure of downstream users cannot be lower than 4.0MPa, the daily total gas characteristics of peak peaks of each user are shown in table 1, and a joint scheduling scheme which gives full play to the peak regulation capacity of the supporting pipeline of the receiving station is required to be determined:
TABLE 1 downstream customer usage characteristics
Step 1: by utilizing hydraulic simulation analysis, the LNG receiving station is set to carry out constant-pressure output at the highest allowable output pressure of 9MPa, characteristic data of daily gas consumption at the peak of a downstream user is obtained through the GMS system of the LNG receiving station, and automatic setting and simulation are carried out, and the hydraulic simulation analysis result shows that the lowest gas receiving pressure of the downstream user is 5.5MPa and is higher than the gas pressure requirement of the lowest 4.0MPa, so that the gas demand of the downstream user can be met in a combined peak regulation mode, and the next step can be carried out;
step 2: a reasonable initial plan is determined.
The difference delta Q between the high peak value and the low peak value of the total gas volume within 24 hours on the peak day of the downstream user is 110-15-95 kNm3H, absolute value | Q satisfying the difference between the gas consumption at any ith hour and at (i +1) th houri+1-QiWhen the output is greater than the delta Q/2, the two moments are respectively 4 points and 22 points, the 24 hours are divided into 2 time periods which are respectively 22-0-4 points in the 1 st time period and 5-21 points in the 2 nd time period, and the output in the 1 st time period is 192/7-27.43 kNm3H, the hour output in the 2 nd period is 1855/17-109.12 kNm3H is used as the reference value. Through hydraulic simulation, the lowest gas receiving pressure of a downstream user is 3.8MPa, the gas pressure requirement of the user is not met, and the next step is required;
and step 3: and determining the output scheduling scheme which finally meets the user requirement.
The LNG receiving station is provided with 5 export gasification production lines, so that the hourly export ratio of the 1 st time period and the 2 nd time period can be set according to 4 combined schemes of 1:2, 1:3, 1:4 and 1:5, the downstream user gas demand can be met when the export ratio of the two time periods is 1:3 through trial calculation, and the hourly export ratio of the 1 st time period is 2047/(7+3 × 17) 35.29kNm3H, the output in the hour of the 2 nd period is 3 multiplied by 35.29 which is 105.88kNm3And h, transmitting the output scheme signal to a DCS (distributed control System) of the LNG receiving station, and carrying out operation control on the gasification output production line.
The above embodiments are only for illustrating the present invention, and the steps may be changed, and on the basis of the technical solution of the present invention, the modification and equivalent changes of the individual steps according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (6)
1. A method for scheduling peak shaving capacity of an external transmission pipeline matched with an LNG receiving station is characterized by comprising the following steps:
1) judging whether the gas consumption requirement of downstream users can be met by a combined peak regulation mode of the LNG receiving station and a matched external transmission pipeline;
2) determining an initial output scheme;
3) correcting the output volume in certain hours, and determining an output scheme which finally meets the requirements of the user;
in the step 1), the judging method is as follows: the method comprises the steps that the output pressure of an LNG receiving station is set to be the highest allowable output pressure and constant pressure, downstream users are set according to respective gas use characteristics, whether the lowest gas receiving pressure of each downstream user meets the gas use pressure requirement of each downstream user within 24 hours of a gas use peak day is calculated through hydraulic simulation, and if yes, the downstream user gas use requirement is met in a combined peak regulation mode;
in step 2), setting an initial output scheme according to the general gas consumption characteristics of downstream users, namely distributing the output mode of a receiving station according to the total gas consumption of the downstream users, dividing a peak gas consumption day for 24 hours into a plurality of time periods with different output, wherein the time periods with different output are not more than 2, and the output per hour in each time period is equal to the hour average value of the total gas consumption of the users in the time period;
the initial output scheme determination method comprises the following steps:
2.1) dividing different output time periods according to the general gas use characteristics of downstream users 24 hours in a peak gas use day;
2.2) determining the high peak value and the low peak value of the total gas volume of the downstream users within 24 hours of the peak day, and recording the difference between the high peak value and the low peak value as delta Q;
2.3) starting from point 0, if the absolute value | Q of the difference between the gas consumption at any of the i-th hour and the i +1 th houri+1-QiIf the number of the output time periods exceeds 2, the segmentation points with larger difference of gas consumption are reserved;
and 2.4) the hourly output volume in each output period is equal to the hourly average value of the total consumption of downstream users in the period, and if the initial scheme meets the gas consumption requirement of the users, the initial scheme is the final scheme.
2. The scheduling method of claim 1 wherein the modifying of the hourly export volumes is performed by adjusting the hourly export volumes for each time segment according to different ratios of the hourly export volumes for different time segments based on the initial schedule to determine a final export schedule that meets the gas demand of the downstream customer if the initial schedule fails to meet the gas demand of the downstream customer.
3. The dispatching method as claimed in claim 2, wherein the average hourly throughput in each throughput period is adjusted, and the adjustment principle is changed according to the hourly throughput ratio of the 1 st period to the 2 nd period being 1:2, 1:3, …, 1 (N-1) and 1: N in sequence, wherein N is the number of gasification throughput lines.
4. A dispatching system for fully exploiting the peak shaving capability of an associated export pipeline of an LNG receiving station for implementing the dispatching method as claimed in any one of claims 1 to 3, comprising: the device comprises a judgment module, an initial scheme determination module and an output scheme determination module;
the judgment module is used for judging whether the gas consumption requirement of a downstream user can be met by the combined peak regulation mode of the LNG receiving station and the matched external transmission pipeline;
the initial scheme determining module is used for determining an initial output scheme;
the output scheme determining module corrects output volume in certain hours and determines an output scheme which finally meets the requirements of users;
in the initial scheme determining module, an initial output scheme is set according to the total gas consumption characteristics of downstream users, that is, the output mode of a receiving station is distributed according to the total gas consumption of the downstream users, 24 hours of a peak gas consumption day is divided into a plurality of time periods with different output, the number of the time periods with different output is not more than 2, the output per hour in each time period is equal to the hour average value of the total gas consumption of the users in the time period.
5. The scheduling system of claim 4 wherein the determining module determines the method to be: the method comprises the steps of setting the output pressure of an LNG receiving station as the highest allowable output pressure constant pressure output, setting downstream users according to respective gas use characteristics, calculating whether the lowest gas receiving pressure of each downstream user within 24 hours of a gas use peak day meets the gas use pressure requirement of each downstream user through hydraulic simulation, and if so, considering that the gas use requirement of the downstream users is met in a combined peak regulation mode.
6. The scheduling system of claim 4 wherein the modification of the hourly output volumes in the output scheme determining module is to adjust the hourly output volumes for each time segment according to different ratios of the hourly output volumes for different time segments based on the initial scheme to determine a final output scheme that can meet the gas demand of the downstream user if the initial scheme fails to meet the gas demand of the downstream user.
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