Kornienko V. Increasing the efficiency of heat utilization circuits of cogeneration units with using of water-fuel emulsions

The thesis is devoted to increase the efficiency of heat utilization circuits of cogeneration units with use of water fuels emulsions by reducing emissions of harmful substances and fuel consumption of power plant due to installation of condensation heating surface in exhaust gas boiler (EGB) and increasing depth of waste gas utilization from EGB. Studies of low-temperature corrosion and contamination kinetics, which made it possible to obtain approximation equations for predicting processes development and 23 shortening the experimental time, were carried out. Based on the experimental studies, the semiempirical correlation dependences of specific loss of metal mass and specific mass of pollution from water content of water-fuel emulsion, sulfur content in fuel oil and excess air factor at wall temperatures below the dew point temperature of sulfuric acid pair are obtained. It is determined that the minimum value of wall temperature, which provides reliable operation of condensation low-temperature heating surfaces, is 70 °С. A threedimensional model is developed and the regression equation is obtained for determining the specific loss of metal mass and the specific mass of pollution of low-temperature heating surfaces.