A calculation problem for a hydrogenation unit
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A new hydrogen system has a total volume of 100 m3; nitrogen purging of this system is required before it can be put back into operation after shutdown for maintenance. The displacement scheme involves supplying nitrogen from the boundary area and venting from the end; after each pressurization to 0.5 MPa, the pressure is reduced to 0.05 MPa. Calculate how many permutations are required for the system to meet the standards, and how much nitrogen is needed.
One charging cycle can produce approximately 500 cubic meters of nitrogen. As for the number of replacement cycles required, it depends on the results of laboratory analyses and past experience with such replacements.
One charging cycle fills in about 500 cubic liters of nitrogen. Based on our past experience, 5 to 6 replacement cycles are sufficient to achieve the desired standard.
Not necessarily; the density difference between hydrogen and nitrogen is quite large. To measure the hydrogen content, it’s best to take samples from multiple locations, as it’s difficult to perform replacement in higher areas.