A MODIFIED ORGANIC RANKINE CYCLE (ORC) PROCESS

摘要

The present invention provides a modified Organic Rankine Cycle (ORC) process, for reducing or preventing pump cavitation, wherein an ORC working medium flow is pressurized in a pump, heated in a heat exchanger by the use of a waste heat flow, and expanded in an expansion machine. The working medium flow from the expansion machine is split in a splitting device into two parallel working medium flows, the working medium flow is condensed in a condenser by the use of a cooling medium flow, the working medium flow is cooled in a heat exchanger to a temperature lower than the temperature of the working medium flow from the condenser by heat exchanging with an LNG flow flowing from a LNG fuel storage tank through the heat exchanger and to a LNG fuelled machinery, and the condensed working medium flow from the condenser and the cooled working medium flow from the heat exchanger are combined in a mixing device positioned upstream of the pump.