RESEARCH OF THERMAL PROCESSES AT DRYING OF SOLID LOOSE MATERIALS IN AN ASCENDING STREAM OF PRODUCTS OF BURNING OF BIOGAS

Abstract

At present, hot air is mainly used as the coolant in dryers, the high temperature of which is provided by the use of various heating devices. the operation of these devices requires considerable expenditure of various traditional types of energy. the dryers themselves have a complex design, large weight and size characteristics, are difficult to maintain and costly. to minimize the dependence of drying in the «boiling» layer on the use of traditional energy sources and to ensure complete autonomy of the process, the use of high-heated combustion products of alternative energy sources (biogas or associated gas) that can be accelerated in a dryer under natural conditions convection. The stock of such sources of thermal energy is practically inexhaustible, very accessible, and their use does not entail large economic costs. to develop a mathematical model for calculating the heat balance of drying in the installation, a heat input and heat removal scheme was compiled in it. to study the dependence of the energy of the combustion products of the biogas mixture with air on these factors, the modern program complex terra «program of thermodynamic calculation of the phase composition of arbitrary heterogeneous systems, as well as their thermodynamic and transport properties» was used. As a result of calculations for 7 mixtures, text and graphic data were obtained. the graphical dependences show that, as the equilibrium temperature increases, their enthalpy increases. At the same time, the initial composition of the «biogas-air» mixture has a significant influence on the enthalpy value. The thermodynamic calculations have shown that the calorific value of the biogas-air mixtures of pg provides the required conditions for drying the solid bulk materials in the «boiling» layer created in the system under development.