Why does the specific methanol consumption decrease on the same day after the raw material methanol is unloaded?
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In the process of hydrogen production via methanol cracking, the specific consumption of methanol decreases on the day when methanol is supplied and stored in the tank, based on the level of methanol present. Could someone explain this?
The calculation of methanol consumption is based on the decrease shown by the level gauge, right? When the tank is at a low level, the volume decrease per unit height on the lower head surface is less
I wonder if the tank was discharging when the methanol was being loaded into it If no material is discharged into the tank, how can the total amount of methanol in the tank be determined? Is it the total amount of methanol already present plus the amount of methanol added to the tank, or is the amount of methanol calculated directly from the liquid level?
I have also worked on hydrogen production from methanol, and there could be several reasons for this situation: 1. The temperature effect after the initial unloading of methanol; 2. The storage tank isn’t perfectly uniform, with a larger diameter at the bottom; 3. Metering errors
Additional note: The storage tank is vertical with a flat bottom. 25 tons of methanol are unloaded each time, and the unloading process is completed within 90 minutes. Methanol consumption is calculated on a daily basis at 7 o’clock each day: (liquid level yesterday – liquid level today) * coefficient + amount unloaded
Could it be related to the readings of the level gauge? Are the temperature and density after unloading different from those before unloading?