Cold box with ortho-para hydrogen conversion function

Abstract

The invention discloses a cold box with an ortho-para hydrogen conversion function. The cold box comprises a shell. A shell inlet and a shell outlet are formed in the shell, a cold source can flow into the shell via the shell inlet and can flow out of the shell via the shell outlet, a combined heat exchange tube is further arranged in the shell, a heat exchange tube inlet and a heat exchange tubeoutlet of the combined heat exchange tube extend out of the shell, the combined heat exchange tube comprises a spiral curved heat exchange tube and a straight heat exchange tube, the spiral curved heat exchange tube annularly sleeves the straight heat exchange tube, and catalysts capable of catalyzing ortho-para hydrogen conversion are arranged in the straight heat exchange tube. The cold box withthe ortho-para hydrogen conversion function has the advantages that multi-gas-flow sunken tube-and-shell heat exchanger design concepts are adopted, accordingly, hydrogen cooling and ortho-para hydrogen conversion of hydrogen can be synchronously carried out in the cold box, heat generated in ortho-para hydrogen conversion procedures further can be absorbed, and the temperatures can be maintainedin the ortho-para hydrogen conversion procedures.

Description

technical field [0001] The invention relates to the field of liquid hydrogen production equipment, in particular to a cold box with the function of positive-parahydrogen conversion. Background technique [0002] Liquid hydrogen is a colorless, odorless, transparent liquid formed from liquefaction of hydrogen, which is a mixture of parahydrogen (p-H2) and orthohydrogen (o-H2). Orthohydrogen and parahydrogen are two spin isomers of molecular hydrogen. The chemical properties of parahydrogen and orthohydrogen are exactly the same, but the physical properties are different. At room temperature or above room temperature, the equilibrium composition ratio of positive and secondary hydrogen is 75:25, which is called standard hydrogen (n-H2) or normal hydrogen. When the temperature is lower than normal temperature, the equilibrium composition ratio of positive and parahydrogen will change, and the percentage of parahydrogen will increase. The normal-to-secondary conversion of gase...

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Problems solved by technology

[0003] Now there is a cold box that can provide cooling capacity for gaseous hydrogen liquefaction and a cold box that can provide gaseous hydrogen normal-parahydrogen conversion, but currently does not have a cold box that can simultaneously provide cooling capacity for gaseous hydrogen liquefaction and gaseous hydrogen normal-parahydrogen conversion cold box

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