Liquefied natural gas (LNG) cold energy gradient utilization system and control method

Abstract

The invention provides a liquefied natural gas (LNG) cold energy gradient utilization system and a control method. When an abnormal working condition appears to a certain technology of a refrigerant expansion electronic system, refrigeration storage area subsystems and data center area subsystems, it is ensured that other areas are not affected to continue production, and other refrigerant gradient technologies can stop due to the abnormal working condition of the certain technology. Thus, efficient cold energy gradient utilization is realized, a temperature utilization range is wide, the relative independentability of each technological segments of the LNG cold energy gradient utilization is improved, the operating flexibility and error-tolerant rate of an overall project are improved, the economic impact of the breakdown is reduced, safety production can be realized, the operation cost is reduced, so that the overall project is environmentally friendly, potential safety hazards are reduced to the lowest, and the implementation of other projects of a station is not affected.

Description

technical field [0001] The invention relates to the field of utilization of LNG cold energy, in particular to a cascade utilization system and control method of LNG cold energy. Background technique [0002] As environmental problems continue to become prominent, my country's energy consumption structure has also undergone corresponding changes. Liquefied natural gas (LNG) has gradually become an important strategic reserve energy due to its advantages of cleanness and environmental protection. At present, China has become the world's largest importer of natural gas, of which imported LNG accounts for 53% of the total natural gas supply. In 2018, China's total LNG imports were nearly 54 million tons, a year-on-year increase of 41.2%, and the net import increase was 16 million tons, accounting for 59.26% of the global increase, ranking first in the world. In the future, China will still be the country with the strongest LNG market demand, and China's LNG import capacity is ...

AI Technical Summary

Problems solved by technology

This method realizes cascaded utilization of cold energy by combining the cold energy of LNG with the waste heat of coal-fired waste gas, but its process flexibility is poor. If the LNG power generation system or CO 2 When the liquefaction system fails, it will cause the entire process to shut down, which cannot be well applied in various working conditions

Existing LNG cold energy utilization patents, no emergency measures in case of leakage or damage in the cascade utilization of cold energy, a single project for cascade utilization of cold energy, difficult operation and many maintenance links

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