METHOD AND DEVICE FOR THE RECUPERATION OF HEAT QUANTITIES FROM A PROCESS GAS FLOW

摘要

Disclosed is a method for recuperating heat quantities from a process gas flow that contains large amounts of heat and has a temperature of 70 to 220 °C. According to said method, heat is indirectly transferred to a heat-absorbing working fluid that flows in a closed circuit. The pressurized liquid working fluid is evaporated by condensing the process gas flow, is then expanded in an expansion turbine, and is subsequently condensed and pressurized again. In order to recover the primary losses that are composed of working fluid and buffer gas and occur because of leaks in the area of the expansion turbine, the leakage flow is divided into a phase which contains the working fluid and is redirected into the circuit and a phase containing the buffer gas.