Lamination type efficient air-cooled resistive heat exchanger for high-temperature superconducting large current lead

Abstract

The utility model discloses a lamination type heat exchanger between a current lead room temperature section and a high-temperature superconducting section used for a large-scale superconducting magnet. The lamination type heat exchanger comprises a heat exchange core body formed through the adding of thin copper sheet parting strips among a plurality of superposed thin copper sheets for separating and the fixing of the thin copper sheet parting strips into a whole through rivets; through holes and salient points which are regularly distributed are formed on each thin copper sheet; thick copper sheets are respectively arranged above and below connector sections at the two ends of the heat exchange core body for protection; uniformly-distributed channels are formed by gaps among the superposed thin copper sheets; the heat exchange core body is welded with copper electronic beams at the current lead room temperature section and the high temperature superconducting section at the two ends; the flow channels of the heat exchange core body are communicated with flow channels at the two ends of the heat exchange core body; and a non-connector segment of the heat exchange core body is encapsulated by a stainless steel case and is subjected to vacuum tightness. The lamination type heat exchanger has high performance in design, large heat exchange area, uniform heat exchange with cooling airflow and high heat exchange of higher than 99 percent; and the resistance of the connector is far less than that of the copper wire cable heat exchanger.

Description

technical field [0001] The invention relates to the field of power supply feeders for superconducting magnets of large-scale thermonuclear fusion devices or other large-scale electromagnetic devices, in particular to a laminated high-efficiency air-cooled resistive heat exchanger for high-temperature superconducting large-current leads. Background technique [0002] Thermonuclear fusion will provide mankind with inexhaustible clean energy, and the International Thermonuclear Test Reactor (ITER) program will be built in the next ten years. The current leads that feed its giant low-temperature superconducting magnets are the most important source of heat load. The use of HTS current leads can save 2 / 3 of the cooling power consumption, which has become the consensus of designers of superconducting magnet power supply feeders. However, copper current leads still need to be applied to the warm end from room temperature to high-temperature superconducting parts. For large current...

AI Technical Summary

Problems solved by technology

70kA current lead test results show that its efficiency is only 87%

The heat exchangers of the 13 kA and 6 kA current leads of the LHC collider all use meandering flow fin heat exchangers, which are limited by the pressure difference, the fin spacing is large, and the efficiency is lower than 80%.

The fatal disadvantage of the meandering flow heat exchanger is that the heat transfer area is too small, which will inevitably lead to an increase in the temperature difference between the heat exchanger and the air flow, and requires an increase in the flow rate

[0005] Another disadvantage of low-efficiency heat exchangers is that the temperature of the helium flow discharged from the heat exchanger is low, and the excess cooling capacity also causes frost or condensation at the room temperature end of the current lead, reducing the level of electrical insulation

In order to prevent this phenomenon, electric heaters have to be used to increase the temperature, which consumes extra electric power

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