The article discusses the development of a mathematical model in the deterministic form of recording the main dependences that determine the process of vaporization in a steam power plant to produce heat and electricity when used as a source of biofuel energy. Theoretically, the parameters of the working process of the installation were calculated; thermal efficiency of the turbine; heat useful used in the boiler unit; the efficiency of the boiler; the percentage of heat loss with exhaust gases; the estimated hourly consumption of solid biofuel; the annual amount of heat obtained by burning the mass of crop residues; the theoretical combustion temperature of crop residues; the actual steam velocity in the Laval nozzle; the heat loss in the nozzle, etc.in the course of calculations with the help of a multi-factor experiment, the parameters and the shape of the turbine blade used in the installation were obtained. Using the presented mathematical model given in the article and the data of the Federal state statistics service, we obtain the numerical values of the working process of the installation working on biofuel. For convenience, all the summary theoretical data of the numerical values of the basic theoretical dependences of the mathematical model of the working process of the layout of the steam power plant for heat and electricity was included in the table. Thus, theoretical studies show the possibility of producing electricity of the required quality using straw to produce high-pressure steam.

Keywords: mathematical model the working process of the pressure volume, a steam turbine,producing heat and electric energy, biofuels