The residence time of the fluid within the equipment and the normal liquid level of the equipment
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It seems that these two are related, but the connection isn’t clear. Is it possible to determine the normal liquid level using the residence time? ?
The residence time is related to your flow rate and the size of the container; the flow rate is inversely proportional to the residence time, while the container size is directly proportional to it. Of course, this applies under conditions of continuous flow with a constant liquid level. The liquid level in the device is determined by the size of the container and the amount of liquid stored in it.
The residence time is determined by specific operational considerations; if a tank is used merely as an intermediate buffer, its residence time during continuous operation may be only 10 minutes. The volume required is equal to flow rate multiplied by residence time, and this accounts for approximately 60% of the total volume of the equipment. When designing the tank, it is necessary to take into account the height-to-diameter ratio, so that the size of the tank can be calculated. It’s fine to make the container bigger; it’s just a waste of money. If gas-liquid separation is required, the residence time might be around 20 minutes, and the liquid level should not exceed 50%. Generally, LLL is 10%, NLL is 60%, and HLL is 90%.
Residence time; in the case of continuous operation, the volume required is equal to flow rate multiplied by residence time.
What was said on the 2nd and 3rd floors makes a lot of sense. The original poster can really understand what they are saying! I’ve learned it too!
Flow rate × Residence time = Volume of the container
What was said above is correct, but the explanation regarding the duration of stay is incorrect. For a container, the effective residence time (buffering time) refers not to the entire volume of the container, but rather to the volume corresponding to its normal liquid level. If the volume coefficient for the normal liquid level is 50%, then the effective residence time is 50% of the total volume residence time. In other words, the effective dwell time is the key parameter in engineering design.
Liquid flow rate × residence time = liquid volume. The liquid volume represents the space occupied by the liquid at the normal liquid level; thus, it is certainly possible to calculate the normal liquid level using the residence time, the liquid flow rate, and the diameter of the container!
Under a constant flow rate, the volume of the container determines the residence time.