Abstract
To date, thermal rectors with submersible combustion devices with efficiency of more than 100 % relative to the lowest heat of combustion are known. This method of heating is more universal and energy efficient due to the absence of heat losses in transportation and maximum utilization of the carrier heat. This opens up broad prospects for the use of these energotechnological facilities in residential gas heating systems. This work has studied the effect of electromagnetic fields having intensity gradient in the direction of motion of the contacting phases on the process of mass transfer between counter-current-moving gas and liquid phases. It was shown that the optimal method of intensification of heat and mass transfer in the submerged combustion devices is oscillation of the contacting phases under action of an electric spark discharge. Design solutions were proposed for intensifying the heat and mass transfer process and increasing the energy efficiency of operation of thermal reactors with the submersible combustion devices. To evaluate the effect of magnetic and electric fields upon their application, it was proposed to use the developed vibrofrequency measuring transducer with a cylindrical-type resonator. Application of such control method makes it possible to measure total frequency-modular oscillations of the contacting phases. In this case, there is no need to control characteristics of magnetic and electric fields and assess their individual effects on the intensity of oscillations in the contacting gas-liquid phases.
Highlights
Intensification of heat and mass transfer in combined gas-liquid processes and apparatuses provides an opportunity to increase productivity of devices with a reduction in their dimensions, metal consumption, cost, operating costs
– develop a method and device for imposing an optimal effect on the interface between the phases of the gas-liquid system to amplify oscillations of the contacting phases in order to intensify heat and mass transfer in reactors equipped with submersible combustion devices;
The results of study of the effect of magnetic fields on mass transfer in gas-liquid systems indicate that magnetic fields, even at low intensities, can be a means of intensifying mass-exchange processes in installations equipped with Submersible combustion devices (SCD)
Summary
Intensification of heat and mass transfer in combined gas-liquid processes and apparatuses provides an opportunity to increase productivity of devices with a reduction in their dimensions, metal consumption, cost, operating costs. Various methods for intensifying heat and mass transfer have been proposed and investigated For this purpose, flow turbulators are used widely on the surface, flow swirling with swirlers installed at the entrance to the apparatus, mixing gas bubbles with the gas flow, rotating or vibrating the heat and mass exchange surface and influencing the flow with electrostatic, magnetic fields [2]. Flow turbulators are used widely on the surface, flow swirling with swirlers installed at the entrance to the apparatus, mixing gas bubbles with the gas flow, rotating or vibrating the heat and mass exchange surface and influencing the flow with electrostatic, magnetic fields [2] In this case, effectiveness of intensification for various methods at substantially differing energy costs is different and is evaluated in each instance. Development of a gas-liquid thermal reactor equipped with an SCD, which generates oscillation of contacting phases by imposition of electromagnetic fields should be considered an urgent issue
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