liquid butane flow control 1

[rika kose]

We have a liquid butane tank 6 barg pressurized by N2.
We want to have constant flow injecting into a reactor, e.g. 0.05 kg/s. At this moment, there is only one flow control valve in the injecting line. Butane flashes in the valve. downstream the valve, icing. flow is very unstable. a mass flow meter is near the storage tank, around 30 m before the control valve.

What is the right setup? how to improve the system?

 

[georgeverghese]

If you cannot add an internal heating bundle, then install an external kettle type (TEMA AKU or BKU ) heat exchanger with LP steam or similar as heating medium on tubeside. Draw off vapor only from vapor side of kettle to user. Operate the kettle on constant level control with LCV upstream. And modulate steam feed on vapor space pressure control - say 4.5-5.0barg. PIC cascade on steam flow control would be better.