Scheduling method and system for peak shaving capacity of supporting external pipelines of lng receiving station

Abstract

The present invention relates to a scheduling method and system for the peak-shaving capacity of the LNG receiving station's supporting external pipeline, which includes: judging whether the combined peak-shaving method of the LNG receiving station and the supporting external pipeline can meet the gas demand of downstream users; determining the initial Outgoing scheme: modify the outbound volume for certain hours, and determine the outbound scheme that finally meets the needs of users. The present invention can quickly obtain a reasonable external transportation scheme of the LNG receiving station under the condition that the LNG receiving station and supporting external transportation pipelines are faced with increasing gas consumption and peak-shaving volume of downstream users, so as to maximize the peak-shaving capability of the supporting pipelines and make the best use of them. It is possible to keep the receiving station running smoothly to meet the gas demand of downstream users. The invention can be widely applied in the technical field of natural gas pipeline peak-shaving scheduling operation.

Description

technical field [0001] The invention relates to the technical field of natural gas pipeline peak-shaving scheduling operation, in particular to a scheduling method and system for the peak-shaving capability of an LNG receiving station's supporting export pipeline. Background technique [0002] As the proportion of natural gas in primary energy consumption continues to increase, the construction of LNG receiving stations and their supporting natural gas pipelines is also developing rapidly. Ensuring the safe, reliable and stable operation of LNG receiving stations and supporting pipelines has become one of the important goals of pipeline operators . Many operators of LNG receiving stations supporting external pipelines have continued to expand the downstream market after the project was put into operation. With the continuous increase of downstream users, the gas consumption and peak shaving demand of users are often increasing, which directly affects LNG receiving. smooth o...

AI Technical Summary

Problems solved by technology

[0003] There are two main methods of peak regulation at the LNG receiving station and its export pipelines: one is that the receiving station is only responsible for adjusting to the daily peak, and the hourly peak regulation is fully undertaken by the pipeline, that is, the LNG receiving station is responsible for the 24 hours of the peak gas consumption day The output volume per hour is a stable value. This peak-shaving method maximizes the peak-shaving capacity of the pipeline and ensures the smooth operation of the LNG receiving station, but requires the pipeline to have enough capacity to meet the hourly demands of downstream users. Peak shaving demand, with the increase of downstream users and gas consumption, this method often cannot meet the peak shaving demand, and the external transmission working conditions of the LNG receiving station need to be adjusted

The second is that the LNG receiving station and the pipeline jointly undertake hourly peak regulation. This method can timely adjust the output of the LNG receiving station according to the characteristics of the total gas consumption of downstream users, and meet the gas demand of downstream users while fully utilizing the peak regulation capacity of the pipeline. , but there is no clear and unified regulation on how to adjust the hourly output of LNG receiving stations according to the overall gas consumption characteristics of downstream users. Usually, operators can only calculate and predict specific issues based on experience and gas pipeline process calculation formulas , less efficient

[0004] There are three main methods of traditional LNG receiving station and supporting pipeline joint peak shaving scheduling methods: one is to perform real-time calculation parallel to the actual production data and "look ahead" according to the scheduling plan through the online simulation system. In actual production, it is only used in a small amount, which requires high technical requirements for production dispatchers, and involves the "noise reduction" processing of a large amount of online real-time data. The operation is difficult and the actual effect is limited; The data (coefficient) of "pressure-pipe volume change" can be judged empirically, but it is impossible to make jump judgments when the gas source and users have a large demand change, and there is no basis for accuracy; the third is through offline simulation software working conditions Feasible schemes have been obtained through trial calculation, but the problem is that there are a large number of possible combinations of the external transportation schemes of the receiving station. Taking the receiving station with N gasification external transportation production lines as an example, there may be a total of (N+1) 24 How to quickly and efficiently determine the export plan that can meet the gas demand of downstream users is an urgent problem to be solved. The traditional method can only be used for trial calculation based on the experience of production personnel, and the efficiency is low. Receiving stations and pipeline operations As a result, business operators often lose the opportunity to further expand the downstream market and increase revenue.

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