Nitrogen slurry preparation device and method combined with throttle valve and expander

Abstract

The invention discloses a nitrogen slurry preparation device with throttle valves and increasing couplings and a method of the nitrogen slurry preparation device. The nitrogen slurry preparation device comprises a liquid nitrogen storage tank and nitrogen slurry preparation units, wherein the nitrogen slurry preparation units comprise the throttle valves, the increasing couplings, heat insulation dewars and vacuum pumps; the liquid nitrogen storage tanks, the increasing couplings and the heat insulation dewars are connected in sequence; the heat insulation dewars are connected with the vacuum pumps; the liquid nitrogen storage tanks are filled with liquid nitrogen; and nitrogen slurry can be received and stored in the heat insulation dewars. According to the generation mode of nitrogen slurry, respective advantages of the throttle valves and the increasing couplings are combined, due to addition of the increasing couplings, the refrigeration capacity of the system can be increased under same flow, due to addition of the increasing couplings, the pressure drop at the two ends of the throttle valves can be reduced in identical inlet / outlet pressure difference, and thus the outlets of the throttle valves are prevented from solid grain blocking; and in addition, the nitrogen slurry preparation device disclosed by the invention is compact in structure, low in manufacturing cost, free of movement component at a nitrogen slurry generation section, and high in reliability. By connecting a plurality of nitrogen slurry preparation units in parallel, continuous large-scale production of nitrogen slurry can be achieved.

Description

technical field [0001] The invention relates to a nitrogen slurry preparation method, in particular to a nitrogen slurry preparation device combined with a throttle valve and an expanding tube and a method thereof. Background technique [0002] Although low-temperature superconductors have been commercialized in many fields such as magnetic resonance imaging, their further development is severely limited due to the need for expensive and complicated liquid helium systems for their operation. Since the discovery of La in 1986 2-x Ba x CuO 4 Since the phenomenon of superconducting transition may appear at around 35K, high-temperature superconductors have become one of the hottest concerns in academia and industry. The superconducting critical temperature has jumped from the liquid helium (4.2K) and liquid hydrogen (20K) temperature range of traditional low-temperature superconductors to the liquid nitrogen (77K) temperature range, even exceeding 100K, successfully overcomin...

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Problems solved by technology

However, the production efficiency of this method is low, and the requirements for the low-temperature heat exchanger are also high

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