4 replies to this topic

[oyester.knowledge]

Hi All,

I am facing problem with operating ejector which is used for recovery of gas.
It is noticed that there is very strong chattering of the check valve which is situated before ejector.

Scheme is as below,

1. Driving gas - Purge gas at 86 kg/cm2 (MW =5)
Flow=20 t/h

2. Suction - vent gas at 2.6 kg/cm2 (MW=37)
Flow=1.2 t/h

3. Outlet pressure of ejector = 2.6 kg/cm2

Can U pls help?
what could be the reason?
how to overcome?

[TS1979]

The outlet pressure at the ejector should be much higher than the suction pressure - called compression ratio. It seems that the compression ratio for your ejector is totally lost. It may be that the condensing temperature is too high or the diverging part is corroded. Anyway, it is the abnormal operation of the ejector

[MAGICAL_RUPI]

Your discharge pressure seems to be much low. It should be higher than the suction pressure atleast. And by the way, what do u mean by 'nrv just before the ejector'? is it on the suction line? any justification for it...

[sheiko]

A detailed scheme would be a must to further help troubleshooting.

[Art Montemayor]

Your suction pressure is equal to your discharge pressure.

It is impossible to have any flow (much less 2.6 t/h) without a DRIVING FORCE (pressure difference). Therefore, if you really have any flow at all, your measuring devices (pressure gauges, flowmeters) are giving erroneous output or you are reading them wrong.

Do what Sheiko recommends and make it a DETAILED schematic diagram, complete with compositions, temperatures, and pressures.