Systems and Methods for Maintaining Pressure in Cryogenic Storage Tanks

摘要

A system for maintaining a substantially constant pressure within an ullage space of a cryogenic storage tank is provided. The system includes a compressor configured to receive fuel gas from the cryogenic storage tank, and compress the fuel gas to produce heated fuel gas. The system further includes a heat exchanger in flow communication with the compressor and configured to cool the heated fuel gas to produce cooled fuel gas, and a turbine in flow communication with the heat exchanger and configured to expand the cooled fuel gas to produce a gas and liquid mixture having a predetermined liquid to gas ratio, and discharge the gas and liquid mixture into the cryogenic storage tank.

主权项

1. A system for maintaining a substantially constant pressure within an ullage space of a cryogenic storage tank, said system comprising:
a compressor configured to:
receive fuel gas from the cryogenic storage tank; andcompress the fuel gas to produce heated fuel gas; a heat exchanger in flow communication with said compressor and configured to cool the heated fuel gas to produce cooled fuel gas; and a turbine in flow communication with said heat exchanger and configured to:
expand the cooled fuel gas to produce a gas and liquid mixture having a predetermined liquid to gas ratio; anddischarge the gas and liquid mixture into the cryogenic storage tank.