Gura D. Integrated process for obtaining thermal energy and silicon(IV) oxide from rice production waste

The dissertation is devoted to development of a method for recycling rice production wastes by organizing an integrated process of obtaining thermal energy and silicon(IV) oxide from rice husk (RH). In the dissertation, thermodynamic and kinetic researches of RH heat treatment process in non-isothermal conditions were conducted. Based on the results obtained dependences of concentration distribution of the components formed in the process of RH heat treatment depending on temperature are shown. Physical model of an integrated process for obtaining thermal energy and SiO2 from RH is offered. Mathematical model of the process that includes equations of heat and mass transfer, gas dynamics and chemical kinetics was developed. The process was investigated with a help of the mathematical model. Influence of different technological parameters on to the process was studied. The basic sizes of a reactor for conducting the process were defined. The device for experimental researches of the RH heat treatment process with obtaining thermal energy and SiO2, was designed. The process of RH heat treatment was investigated with a help of the device involved. Hot water and silicon(IV) oxide powder were obtained as well. The dispersion composition of the received powder was studied and the dependence of the particulate size distribution was determined. The pilot-scale tests of the obtained silicon(IV) oxide powders as elastomers filler were also conducted. Flow diagram of an integrated process for obtaining thermal energy and silicon(IV) oxide from RH was developed. Technical and economic assessment of an integrated process concerned was performed.