The flow rates at the inlet and outlet devices are different
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Our device is a hydrogen deoxygenation unit. The hydrogen enters at a pressure of 0.5 MPa and a flow rate of 8,000 Nm3/h; it is then pressurized to 2.1 MPa by a compressor, deoxygenated and dried using a deoxygenation unit before being sent out. The output pressure is 2.0 MPa (a pressure difference of half a kilogram), with a flow rate of 6,500 Nm3/h. I would like to ask experts: a pressure drop is understandable, but why has the flow rate decreased? There’s a reduction of almost 1,000 Nm3/h during operation. Could this be related to the different pressures on the inlet and outlet sides (0.5 MPa at the inlet and 2.0 MPa at the outlet)? All the flow meters used are orifice flow meters.
1. Process losses, deoxygenation and dehydration； 2. There are changes in the pressure before and after; has the differential pressure flow meter undergone temperature and pressure compensation? ； 3. Issues related to the precision of the orifice plate itself; for example, if its nominal precision is 1%, but the plate has not been actually calibrated during calculation, the error will be greater than 2% ； 4. The on-site installation environment: insufficient straight sections before and after can also affect measurement accuracy. The overall deviation is the result of multiple factors interacting together, and each one should be examined individually.
It itself states Nm3, and Nm3 refers to the volume of a gas at 0 degrees Celsius and 1 standard atmosphere pressure. Pressure compensation is needed as well.
Thank you. I asked the design institute, and they said to check the first two items you mentioned
Thank you. I asked the design institute, and they said to check the first two items you mentioned
Thank you. I asked the design institute, and they said to check the first two items you mentioned
Process losses: if the pipeline is long, 0.5 pressure difference may not be sufficient