0.7 MPa nitrogen
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When calculating the energy consumption of the equipment, does the amount of nitrogen take into account the usage for the gas seal at the top of the tank? Is the gas in the gas seal a continuous quantity or a discrete one?
I don’t understand; I’m just talking nonsense. The gas at the top of the tank may be in larger quantities during the first use, but less amount is used as the system operates. The volume change inside the tank is not significant, so it should be considered an intermittent quantity.
The gas seal depends on the design and material properties, and can be continuous or intermittent
It then depends on the pressure difference set by the pressure relief valve and the backpressure valve before and after the air seal, as well as on the changes in the liquid level inside the pipe; if the changes are significant, they should be continuous
The unit features a raw material buffer tank; feeding and discharging are continuous. Is there significant fluctuation in the liquid level?
We didn’t include it when calculating energy consumption
It depends on what materials you are installing and on the operating condition of the storage tank. In some tanks containing volatile liquids, even without any discharge or addition of material, the liquid level still experiences significant changes throughout the day and night.
Are there any relevant standards available for reference?
The gas seal volume is a discontinuous quantity, and can only be estimated roughly!
The pressure of the gas seal inside the tank fluctuates, but a certain margin for such fluctuations is usually taken into account during design; as long as this pressure does not exceed that limit, no losses will occur； Therefore, I think it should be intermittent. The specific amount of loss is related to factors such as the frequency and flow rate of material intake and output; it is not possible to determine an exact figure, so only an approximate estimate can be made based on normal operating conditions
There are many factors that affect the nitrogen consumption at the tank top: the properties of the medium inside the tank； Upper space of the equipment ； PID parameter values of the control valve ； CV value of the control valve ； ........