New concept of power generation analysis for chemical gas turbine in thermodynamic process with heat sources or cooling devices

摘要

Many years ago, a thermodynamic process of power generation was developed for gas turbines, Supported by adiabatic expansion and compression. Recently, the possible inlet temperature of gas turbines has increased to 1500 deg. C, so its blades ofhigh temperature side have to be cooled by some fluid. If we use the actual adiabatic expansion, it is necessary to check the fluid-dynamic friction caused by fluid flow between the blades. In this case, the gas turbine blades have a cooling effect andfrictional beat-generating effect, as well. If we introduce a new concept, the chemical gas turbine, which creates a reheating effect by heat sources in the expansion process, the outlet temperature of the gas turbine will be increased by this continuosreheating effect. Therefore, when we estimate the performance of a chemical gas turbine, these cooling, frictional and reheating effects have to be checked by theoretical and experimental procedures. The authors here analyze the thermodynamic processwith heat sources or cooling devices to illustrate their theoretical approach to estimating these effects. In this study, the definition of the heat-exchange rate Is introduced to analyze each heating or cooling process. If we introduce thisheat-exchange rate into our analysis of the thermodynamic process, it is possible to differentiate between adiabatic, cooling and heating processes in gas turbines and other machines.