| 摘要 |
Process and device for determining para content X1 of a hydrogen gas stream, in which temperature T1 as well as pressure p1 of the hydrogen gas stream are measured before its entry into at least adiabatically-operated para-ortho-conversion catalyst. The hydrogen gas stream flows through the para-ortho-conversion catalyst until equilibrium is established. Thereafter, temperature T2 as well as pressure p2 of the hydrogen gas stream are measured after the hydrogen gas exits from the para-ortho-conversion catalyst or are measured after the last of the latter exits the catalyst. Para content X1 of the hydrogen gas stream, at the instant before entering the para-ortho-conversion catalyst, is determined by relations h1 (X1, T1, p1)=h2 (X2, T2, p2) and X2=Xg (T2) in equilibrium, in which h1 is the enthalpy of the hydrogen gas stream at the inlet of the para-ortho-conversion catalyst and h2 is the enthalpy of the hydrogen gas stream at the outlet of the para-ortho-conversion catalyst. |
