Many new liquefied natural gas (LNG) projects have been completed and are operating successfully in China, increasing LNG import trade volumes. International trade of LNG is generally based on long-term take or pay contracts where a buyer will pay even if the product is not required. This means that the import volume and storage capacity at the receiving terminal is directly influenced by downstream consumers. A transportation plan is specified in the contract, which determines the volume of LNG shipped from the upstream output terminal to the low-temperature storage tank of the receiving terminal. Through in-depth analysis of the supply and demand chain, a process control system is devised to ensure that the storage facility has the capacity to receive all scheduled shipments of LNG. This is achieved by controlling the gas transmission between the LNG receiving terminal and the trunk line. By utilizing information processing and automation control technology, errors of judgment can be avoided so that the arrival of LNG shipments at the receiving terminal are coordinated efficiently and safely with gas transmission and combined dispatching of gas to downstream users.
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