Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy
DOI:
https://doi.org/10.15587/1729-4061.2017.97914Keywords:
submerged combustion apparatus, cyclic input of energy, screw agitating device, energy efficiencyAbstract
We examined the formation of oscillations of contacting phases (gas–fluid) in the thermal reactors, equipped with submerged combustion apparatuses, with the help of the cyclic input of energy for the intensification of heat-mass-exchange processes and improvement in the energy efficiency of their operation. It is established that the cyclic input of external energy increases the mass transfer by 2–2.5 times, as well as energy effectiveness of the process as a whole. A distinctive feature of the thermal reactor with the cyclic input of energy is in the fact that the air, preheated in the thermal installation with SCA that works on the principle of a "vapor pump", enters the upper and lower collectors of SAD. In this case, the air is dispersed depending on the angle of blade rotation, which contributes to the turbulization of phase boundary, which improves energy efficiency of the reactor operation.
Based on the conducted studies, we designed a thermal reactor with the built-in submerged combustion apparatuses and the cyclic input of external energy for creating the turbulent pulsations that works on the principle of a "vapor pump". The performance characteristics of the device with the cyclic input of external energy were determined based on the obtained results. The developed thermal reactor makes it possible to control the process of heating and can be easily modified, depending on the technological requirements. The energy-technological indicators of the designed thermal reactor meet the world requirements: the content of nitrogen oxides does not exceed 56.8 mg/m3 at high-temperature water heating – to 70–80 °С. The thermodynamic efficiency of the thermal reactor operation reaches 98.6 % (by direct balance).References
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