Simple calculation method for the thermodynamic properties of byproduct coal-gas fired by CCGT — A case study

The simple calculating method for the thermodynamic properties of byproduct coal-gas of iron and steel plants used in the simulation of gas compression system of combined cycle gas turbine (CCGT) power plant is discussed by a case study. Firstly of all, the common calculation process and equations for the thermodynamic properties of byproduct coal-gas are given. Then, the relationship between the volume proportions of constituents, condensation of water vapor, temperature and the thermodynamic properties of byproduct coal-gas is analysis by calculating results, and the corresponding strategies for the simple calculation of the thermodynamic properties of byproduct coal-gas under off-design conditions are given. The relationship between the thermodynamic properties of byproduct coal-gas and performance of compressor is analysis by simulation, and the results indicated that the thermodynamic properties of byproduct coal-gas used in the performance prediction of multistage compressor should be calculated according to the inlet temperature and pressure of each stage, eliminating the influence of the significant change of the temperature on the thermodynamic properties of the working fluid.