To add a little more here:

The software I had access to at the time of the requested analysis couldn't handle a true liquid being injected into gas stream. Thus, the best I could offer would be to demonstrate what would happen if a cold (250F) slug of liquid contacted a hot (650F) metal.

The results were quite unsurprisingly an impressive disaster, with somewhere between 200-400F difference between inside and outside of the pipe.

I'm not completely convinced that even if the software I had could depict a gas/liquid temperature and scattering effect that its survivability would increase drastically.