Abstract
The aim of present study was to design an oil separator for the venting systems of gas turbine engines at consumption of gaseous medium 200 m 3 /h. In order to accomplish the objective, we applied separation gradient aerosol technologies, which consider all the forces and effects that influence deposition of the highly dispersed particles. A scientific base is substantiated for the intensification of gradient processes of the transfer of aerosol media in the boundary layers of multifunctional surfaces in the purification of dispersed polyphase flows for developing the technical devices that ensure an increase in energy saving and ecological improvement of power plants. We designed a section-by-section structural scheme and a three-dimensional model of the oil separator in finite elements for the calculation of hydrodynamics and separation. The calculations were conducted of the hydrodynamic situation and particle trajectory in the flow area of an oil separator. Using the calculated distribution of speed in the oil separator at G=100…200 m 3 /h, it was determined that velocity in the coagulation profile does not exceed 10 m/s. It was established according to the results of static pressure distribution for G=100, 200 m 3 /h that the pressure differential in the separation coagulators reaches 2.5…3.9 kPa, respectively. Results of the calculation at G=100…200 m 3 /h demonstrated that the summary pulsation effect from the deposition of highly dispersed particles amounts to 25.1 %. Based on the calculations, we designed the prototype of an oil separator and tested it experimentally on the test bench in the form of an open type wind tunnel. Coefficient of the total effectiveness of purification was determined, which reaches 99.9 %. The modernization of purifiers for capturing the aerosols in different systems of power plants is possible based on the separation gradient aerosol technologies. The studies conducted make it possible to develop in the future a range of separators for gas consumption from 20 to 2000 m 3 /h.
Highlights
Results of calculation at G=100...200 m3/h demonstrated that the summary pulsation effect of the deposition of highly dispersed particles reaches 25.1 %
We calculated a hydrodynamic situation and particle trajectory in the flow area of an oil separator, which showed that a particle flies through the entire channel in 0.8 s and its trajectory coincides with the flow line of gaseous medium in the working channel
Using the calculated distribution of speed in the oil separator at G=100...200 m3/h, it was determined that velocity in the coagulation profile does not exceed 10 m/s
Summary
The introduction of new power plants (atomic, gas- and gas-steam turbine), a growth in the number of power plants and the development of industries contributed to an increase in the interest in the problems of two-phase dispersed media. The relevance of the application of a three-dimensional modeling of separation gradient aerosol technologies for creating an oil separator is predetermined by the task to ensure effective removal of harmful liquid admixtures from industrial wastes This issue is an important national-economic problem in coping with the environmental pollution. The given technology makes it possible to capture liquid and solid particles with diameter to 1 μm; separation cartridges with the nano-porous graphite membranes are limited by the operating time and their replacement leads to additional expenditures. This technology is not applicable for catching the highly dispersed particles of oil for the venting systems of a gas turbine engine. The development of separators of gas-turbine engines for the flow rate of gaseous medium at 200 m3/h based on the separation gradient aerosol technologies with purification factor 99.9 % is predetermined by the start of the creation of the new generation of engines at the gas-turbine enterprises of C.P.R
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