The first domestically made LNG/FLNG wound tube heat exchanger realizes industrial application

On November 20, 2021, the first domestic LNG/FLNG bypass pipe jointly developed by CNOOC Gas and Power Corporation (“CNOOC”) and Kaifeng Air Separation Group Co., Ltd. (“Kaifeng Air Separation”) The type heat exchanger was successfully started up at the LNG plant of CNOOC Shandong New Energy Co., Ltd., and completed 72 hours of continuous and stable operation at full load under static and sloshing conditions, and various technical indicators reached the design requirements.

It is reported that the project is a continuation of the “Development of Large-scale LNG Coiled Tube Heat Exchanger” project of the Ministry of Industry and Information Technology. Based on the previous results, the industrial application test of the 300,000 m3/day LNG/FLNG coiled tube heat exchanger for natural gas processing has been carried out. .

The large-scale LNG/FLNG wound tube heat exchanger is the core low-temperature heat exchanger of the world’s large-scale land-based natural gas liquefaction plants and floating liquefied natural gas production storage and unloading equipment (FLNG). It is a national weapon and technology necessary for the development of deep-water natural gas in my country. The threshold is extremely high, and it has been monopolized by a very small number of countries in Europe and America for a long time, which has seriously threatened my country’s development of deep ocean natural gas resources.

The simulation design of the heat exchanger involves the countercurrent coupling law and mathematical model of the boiling evaporation heat absorption outside the mixed refrigerant tube and the condensation flow heat release inside the tube. It is a world-class scientific problem recognized in the field of engineering thermophysics and a technology in the global LNG industry chain. The most difficult and core key equipment has always been the high point developed by global heat exchanger manufacturers, and it is a typical “stuck neck” core equipment.

According to reports, the project’s joint technical team has developed the world’s first full-scale and full-condition LNG/FLNG coiled tube heat exchanger flow and heat transfer characteristics experimental platform. It has completed the analysis and sorting of nearly millions of experimental data, and obtained nearly Thousands of experimental data under different working conditions have successfully developed a high-precision flow and heat transfer correlation. On this basis, the technical team independently developed the first domestic LNG/FLNG wound tube heat exchanger simulation design software, which can quickly and accurately complete the heat transfer calculation and performance simulation of LNG/FLNG wound tube heat exchanger, and applied for Related software copyright.

In order to solve the problem of key components and necks, the project team took the lead in the development of a new type of seamless aluminum-magnesium alloy heat exchange tube with a length of more than 300 meters by the United Nations material supplier. LNG/FLNG coiled tube heat exchanger design and manufacture inspection quality control system and “coiled tube heat exchanger technical specifications”, and formed dozens of invention patents.

The successful industrial application test of the coiled tube heat exchanger of this project fully verified the reliability of the key technologies in the design and manufacture of independent large-scale LNG/FLNG coiled tube heat exchangers, marking that Kaifeng Air Separation successfully entered the field of natural gas liquefaction and became a domestic The first company to simultaneously master the key technologies and core products of wound tube heat exchangers/plate-fin heat exchangers in the fields of air separation and LNG/FLNG natural gas liquefaction. This provides strong technical support for breaking foreign technology monopolies and developing natural gas resources in the South my country Sea, and is of great strategic significance for achieving my country’s “dual-carbon” energy development goals.

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