During normal production! Are the inlet flow and outlet flow of the cyclic hydrogen compressor the same? The total amount of hydrogen should still be increased
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During normal production! Are the inlet flow and outlet flow of the cyclic hydrogen compressor the same? The total amount of hydrogen should still increase. The amount of hydrogen at the inlet of the new hydrogen compressor remains the same after three stages of compression – it still increases!
Mass conservation ensures that it remains the same, but due to reactions taking place, its amount decreases as it enters the reactor; therefore, new hydrogen must be supplied at the compressor inlet.
My unit is capable of carrying out 2 million tons per year of wax oil hydrocracking. The inlet volume of the recycle hydrogen compressor is 270,000 cubic meters; the outlet volume of the fresh hydrogen compressor is 50,000 cubic meters. The hydrogen consumption is 45,000 cubic meters. Hydrogen mixing is carried out after the furnace, and after passing through the heating furnace, the volume becomes 180,000 cubic meters. After heat exchange in the relevant heat exchangers, this volume rises to 200,000 cubic meters. The amount of hydrogen supplied is 20,000 cubic meters. Yet the figures still don’t add up: 27 + 5 – 20 – 4.5 – 2 = 55,000 cubic meters. Is the formula correct? Where do these 55,000 cubic meters go? The counter-rotation function isn’t activated, nor is the cold hydrogen system in use
The original poster might try using mass flow rate for the calculation
Flow meters are all mass meters, and they are all expressed in units of liters per hour
It is difficult to measure gas flow accurately, as it depends on temperature, pressure, and gas composition, all of which may differ from the conditions specified in the design. It’s best to perform temperature and pressure compensation on the flow meter, as this will improve accuracy.
Doesn’t the density of hydrogen change after it’s compressed? Is mass still conserved?
Why isn’t the hydrogen consumption the same as the outlet flow rate of the new hydrogen generator? Volumetric flow rate is determined by the flow velocity and pipe diameter; when the flow velocity decreases due to resistance losses, the flow rate naturally decreases as well.
Flow meters are all mass meters; when the mass is the same, the readings will definitely be the same
I noticed something interesting: I tested two sets of systems, and in both cases the inlet flow rate to the new hydrogen compressor increased after compression. In our system, the pressure is 14.5 MPA; the inlet flow rate is 42,000 cubic meters, while the outlet flow rate is 47,000 cubic meters. The new hydrogen compressor features a stepless flow control system. There’s also a medium-pressure hydrogenation unit, with an inlet flow rate of 11,000 cubic meters and an outlet flow rate of 18,000 cubic meters. There are valves at various stages as well. Those who are interested can check their own systems to see if they understand which formula should be used for calculations
The most doubtful thing is that your gauge is inaccurate; the flow meter shows values in cubic meters； However, in reality, both temperature and pressure are not at standard conditions; therefore, the flow meter converts the actual flow rate to values corresponding to standard conditions before displaying it ； Therefore, it is very likely that your flow meter is not properly calibrated.