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Continuous pressure letdown system

United States Patent

June 8, 2010
View the Complete Patent at the US Patent & Trademark Office
A continuous pressure letdown system connected to a hopper decreases a pressure of a 2-phase (gas and solid) dusty gas stream flowing through the system. The system includes a discharge line for receiving the dusty gas from the hopper, a valve, a cascade nozzle assembly positioned downstream of the discharge line, a purge ring, an inert gas supply connected to the purge ring, an inert gas throttle, and a filter. The valve connects the hopper to the discharge line and controls introduction of the dusty gas stream into the discharge line. The purge ring is connected between the discharge line and the cascade nozzle assembly. The inert gas throttle controls a flow rate of an inert gas into the cascade nozzle assembly. The filter is connected downstream of the cascade nozzle assembly.
Sprouse; Kenneth M. (Northridge, CA), Matthews; David R. (Simi Valley, CA), Langowski; Terry (Renton, WA)
Pratt & Whitney Rocketdyne, Inc. (Canoga Park, CA)
11/ 657,254
January 24, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with the support of the United States Government under Contract No. DE-FC26-04NT42237 awarded by the Department of Energy (DOE). The United States Government has certain rights in the invention.