The impact of liquid ammonia temperature on ammonia consumption in the system
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Dear colleagues and friends, in urea production facilities, the amount of raw materials consumed is an indicator of how well a unit is operating. However, the density of liquid ammonia changes significantly with temperature; at 8°C, its density is 0.6275. I wonder whether the liquid ammonia flow meters used in your urea production units are mass flow meters or volume flow meters. If they are volume flow meters, how can the value be converted to a mass flow rate? Here we use 8°C as the standard for such conversions. Will this have any impact on the ammonia consumption of the system? Does an increase or decrease in the temperature of liquid ammonia have an impact on ammonia consumption under the same production volume? I would be very grateful if all fellow sailors could discuss this or simply share their own opinions!
This is a common problem in all factories; one can only look at the consumption per day, and sometimes fluctuations in temperature cause variations in ammonia consumption as well.
Isn’t it just ammonia used for cooling? Reaching cold equilibrium means meeting the demand; it’s just that at higher temperatures, a greater amount of evaporation is required! !
It’s not related to cooling; it’s during the production of urea using liquid ammonia as a raw material.
To obtain the most accurate ammonia consumption level, it is recommended to use the incremental method for calculation. Firstly, the ammonia consumption associated with urea is the theoretical value; every point in the system where ammonia is lost needs to be measured and added together (such as in vent tubes, granulation exhaust gases, wastewater discharged, etc.), to obtain the final ammonia consumption.
The best solution is to use a mass flow meter; it’s cumbersome to calculate values on a daily basis based on temperature. Under normal conditions, the ammonia consumption isn’t greatly influenced by temperature – it mainly depends on the ammonia content in the air released after absorption, as well as losses during granulation in the tower and product transportation and packaging, as well as the ammonia content in the wastewater discharged. Generally, higher temperatures lead to greater losses
This is a problem that occurs in all cases; you can try using a mass flow meter with temperature compensation