Modelling and simulation of energy conversion in combined gas-steam power plant integrated with coal gasification

The paper presents the modelling and simulation of energy conversion in technological systems of combined gas-steam power plants integrated with coal gasification. The energy analysis of technological systems of gas-steam power plants is connected with energy analysis of various technologies of coal gasification. The base of the performed energy analysis are the elaborate mathematical models of coal gasification process, and of energy processes proceeding in gas and in steam parts of power plants. The mathematical model of coal gasification process for gas-steam power plants allows us to calculate the composition and physical properties, and energy parameters of gas produced in the process of coal gasification, the consumption and temperature of gasifying medium, and both the chemical and the energy efficiency of coal gasification. The mathematical models of energy conversion processes in the gas generator and in the gas cycle of gas-steam power plants are elaborated on the base of quantum statistical physics, and on the base of phenomenological thermodynamics for the steam cycle of these power plants. The mathematical models were the basis for computer programs for multivariant numerical simulation of energy conversion processes in gas-steam power plants. The results of numerical simulation are shown in the form of tables, presenting the influence of the methods of coal gasification process, and of the structure and of the energy parameters of technological systems of gas-steam power plants on the efficiency of electric energy generation in combined gas-steam power plants integrated with coal gasification