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The influence of condensing pressures of the ethylene carrier cascade cycle on its refrigeration capacity

Nanowski D.

Journal of Polish CIMAC

2014

Vol. 9, no 3

67--72

Ethylene, Propane and others liquefied gases as a cargo are transported at sea by temperature below 0°C. It requires sufficient efficiency of reliquefaction plant. Short description of that gas plant is shown including cascade system and its cooling processes are described. Based on Mollier diagrams the refrigeration capacity investigation of gas plant is done. This analysis is focused on condensing pressure which takes place in the condenser. Theoretical cycles are taken into account and real condensers of cargo compressor and screw compressor of refrigerant cycle are considered. Thermostatic expansion valves are employed in cascade cycles and their operation parameters are taken into account as well. Conclusions include some guidelines on condensing pressure and related operation parameters to maintain the gas plant with high efficiency of refrigeration capacity.

Gas plant of ethelyne gas carried and a two stages compression optimization of ethylene as a cargo based on thermodynamic analysis

Nanowski D.

Journal of Polish CIMAC

2012

Vol. 7, no 1

183-190

Ethylene as a cargo is more and more popular in maritime transport. Its temperature approx. -104°C during discharging requires sufficient efficiency of reliquefaction plant. Short description of that gas plant is shown including cascade system and processes are described. Based on Mollier diagram and ethylene mass flows, refrigeration capacity of the system is calculated when some changes in the cargo economizer are done. Some of these changes are carried out by crew members of gas carriers in order to reduce second stage discharge temperatures of reciprocating compressors. These losses of refrigeration efficiency are calculated to assess its influence on Ethylene temperature in the cargo tanks. On the other hand some assumptions are used to improve refrigeration capacity by Ethylene compression process.