ihx means intermediate heat exchanger, which is one of the key equipments for high temperature gas-cooled reactors performing indirect gas turbine cycle or high temperature process heat utilization. The design and research of the intermediate heat exchanger started as early as the 1970s, but so far, only Germany and Japan have developed two units each. Among them, the two German intermediate heat exchangers are used in the PNP project, with a thermal power of 10MW, a helium inlet temperature of 950 degrees Celsius on the primary side, and the heat transfer tubes of Inconel-617, which adopt the spiral tube structure and the U-tube structure respectively, with an operating test time of 5,200 hours for the former and 4,700 hours for the latter. The two intermediate heat exchangers developed in Japan both adopt spiral tube structure, the intermediate heat exchanger used for HTR direct steelmaking research has a thermal power of 1.5MW, and the test operation time is 1962 hours under the helium inlet temperature of 900 degrees Celsius on the primary side, and the material of the heat transfer tube is Inconel-617. The intermediate heat exchanger used for HTR has a thermal power of 10MW, and the helium inlet temperature is 950 degrees Celsius on the primary side, and the heat transfer tube is made of Inconel-617. The intermediate heat exchanger for HTR has a thermal power of 10 MW, the primary side helium inlet temperature is 950 degrees Celsius, and the heat transfer tube material is HastelloyXR.
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