Relationship between nozzle opening and cooling capacity
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I’d like to discuss something with everyone. There is a boost expansion machine installed on the unit, and I’ve noticed that, with the amount of gas expanding remaining constant, adjusting the nozzle opening sometimes results in an increase in cooling capacity and stabilization of the liquid level. However, based on the temperatures at the inlet and outlet of the expansion stage, the cooling capacity per unit does not increase. What is the relationship between the nozzle opening and the cooling capacity, when the air volume at the inlet expansion end remains constant? Thank you!
It will change if the flow rate is increased; if no adjustments are made for anti-stall protection
I’m not sure whether the pressure-boosting end and the expansion end of your expander are connected by the same gas line; in some expanders they are connected by the same line, while in others they are not. If the pressure remains constant, increasing the nozzle size will also increase the expansion volume, and accordingly, the amount of cooling provided will generally increase as well. If there is no pressure buildup, by enlarging the nozzle while keeping the expansion amount constant, the amount of gas and cooling energy at the pressurization end will increase; whereas by reducing the nozzle size to decrease the amount of gas at the pressurization end, the cooling energy will decrease accordingly. Personal opinion. . .
Thank you! However, I feel that the cooling capacity at the expansion end has no direct relation to that at the compression end; we also have an oil brake in between, so cooling can still be produced even without a compression end! I feel now that the nozzle opening has not much to do with the cooling capacity
Oil brakes are different from booster systems: the mechanical work generated by oil brakes is essentially wasted, whereas boosters make effective use of that energy~~This represents an advancement in the development of air separation technology~~As for the cooling capacity, it cannot be determined solely based on the degree of expansion; it also depends on factors such as temperature and pressure before expansion~~Additionally, the linear characteristics of the nozzle are also an important factor~~
If the processing volume remains unchanged but the nozzle opening changes, it is usually due to a change in the inlet temperature at the expansion end