Radionov O. Scientific and applied fundamentals of magnetic fluid sealing, ensuring the environmental safety of hazardous industries

The thesis work is devoted to solving scientific and applied problems of increasing the level of technogenic safety of hazardous industries by creating conditions for their trouble-free operation, eliminating failures in operating equipment and threats of injury to the operating personnel when using magnetic fluid sealing complexes in technical system elements. The main problems and reasons for the failure of technological equipment, in particular the inability of standard sealing systems to ensure complete tightness, are identified. The scientific and methodological approach to solving the problem of preventing the accumulation of defects and the further development of emergencies through the use of magnetic fluid sealing complexes was substantiated, which allowed to increase the level of environmental safety of hazardous industries. The following scientific results were obtained: the temperature heating of technical magnetic fluids at all shear rates, when the magnetic forces exceed the centrifugal, does not exceed 5 °C; the possibility of ensuring reliable operation with increased gaps by self-correction by adding a ferromagnetic micron powder; a multiphysical mathematical model has been developed to investigate processes and phenomena of various physical nature and to substantiate the possibility of increasing the size of the working gap to 0.8 mm and ensuring stable working capacity of MFSC up to linear velocities of 35 m/s. For the first time, the principle of assessing the level of technogenic safety of hazardous industries is substantiated and implemented, developing the methodology of system research in environmental safety, which allows creating integrated approaches to reduce the risk of industrial accidents by evolving design solutions of MFSC, which reduce the amount of technological risk up to 7 times. The practical significance of the work is confirmed by the results of the implementation of environmentally friendly design and technological solutions for the design of the MFSC, which made it possible to organize operation of about 4,000 MFSCs at nearly 200 industrial enterprises of hazardous production facilities in seven countries, has been further developed, as well as patents of Ukraine for invention.