Key issues of steam jet evacuators
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After the steam jet pump is put into use, what is the temperature of its outer wall? Is it hot to the touch? For the pump in our system, the outer wall is cold at the beginning and hot towards the end – it’s quite strange; why isn’t it hot throughout?
In the first half, the temperature should be relatively low, as air enters, and the steam flow rate at the steam nozzle exit is high, making it difficult for the steam to disperse.
We have installed 3 evacuators; two of them have a cold section in the front and a hot section in the back, while the other one has hot sections in both the front and the back
It’s strange; I don’t know what’s going on
I want to say that your extractor with heat on both ends doesn’t work well! (You can compare the vacuum level on site!) ) Cold occurs when a large amount of air is drawn out, taking heat with it; without a significant amount of steam to carry away that heat, the air itself is unable to remove it!
The temperature of the outer wall of the ejector and the saturated steam temperature of water vapor corresponding to the vacuum inside it are the same. In the converging section of the ejector, the vacuum is high so the temperature is low; in the diverging section, the vacuum is low so the temperature is high. In multi-stage ejectors, the temperature of the ejectors at the end where exhaust gas is released is high, while the temperature of those near the system is low. In four-stage and five-stage ejectors, the casing can freeze, and therefore insulation jackets are generally required during use
Comrades, it is very important to pay close attention to the site. The main reason is the Thomson-Joule-Thomson coefficient in physical chemistry, adiabatic throttling expansion
The principle of vacuum creation also needs to be understood carefully