Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.97914

Keywords:

submerged combustion apparatus, cyclic input of energy, screw agitating device, energy efficiency

Abstract

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).

Author Biographies

Valeriy Nikolsky, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

Doctor of Technical Sciences, Associate Professor

Department of Energetic

Vadim Yariz, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of chemical enterprises equipment

Iryna Reshetnyak, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Energetic

References

  1. Rao, D. N., Mohtadi, M. F., Hastaoglu, M. A. (1984). Direct contact heat transfer – a better way to high efficiency and compactness. The Canadian Journal of Chemical Engineering, 62 (3), 319–325. doi: 10.1002/cjce.5450620305
  2. Gong, X., Liu, Z., Jiang, H. (2012). Emissions and thermal efficiency investigation of a pressurized submerged combustion evaporator. International Journal of Low-Carbon Technologies, 7 (4), 257–263. doi: 10.1093/ijlct/cts059
  3. Ribeiro, C. P., Lage, P. L. C. (2005). Gas-Liquid Direct-Contact Evaporation: A Review. Chemical Engineering & Technology, 28 (10), 1081–1107. doi: 10.1002/ceat.200500169
  4. Han, C.-L., Ren, J.-J., Wang, Y.-Q., Dong, W.-P., Bi, M.-S. (2017). Experimental investigation on fluid flow and heat transfer characteristics of a submerged combustion vaporizer. Applied Thermal Engineering, 113, 529–536. doi: 10.1016/j.applthermaleng.2016.11.075
  5. Gong, X. L., Feng, Q., Liu, Z. L., Tang, W. J. (2013). Model Analysis of Pressure Fluctuation in the Pressurized Submerged Combustion. Advanced Materials Research, 779-780, 425–428. doi: 10.4028/www.scientific.net/amr.779-780.425
  6. Tovazhniansky, L. L., Pertsev, L. P., Shaporev, V. P. et. al. (2004). Teploenergetika pogruzhnogo gorenia v reshenii problem teplosnabzheniya i ekologii Ukraine. Integrirovannie Technologii i Enenrgosnabzenie, 3, 3–12.
  7. Niegodajew, P., Asendrych, D. (2016). Experimental study of gas-liquid heat transfer in a 2-phase flow in a packed bed. Journal of Physics: Conference Series, 745, 032139. doi: 10.1088/1742-6596/745/3/032139
  8. Benbelkacem, H., Debellefontaine, H. (2003). Modeling of a gas–liquid reactor in batch conditions. Study of the intermediate regime when part of the reaction occurs within the film and part within the bulk. Chemical Engineering and Processing: Process Intensification, 42 (10), 723–732. doi: 10.1016/s0255-2701(02)00074-0
  9. Bie, H.-Y., Ye, J.-J., Hao, Z.-R. (2016). Effect of Nozzle Geometry on Characteristics of Submerged Gas Jet and Bubble Noise. Journal of Laboratory Automation, 21 (5), 652–659. doi: 10.1177/2211068215584902
  10. Lu, R., Qin, X. H., Wu, D. Z., Wang, H. W. (2013). Theoretical and experimental study on underwater jet characteristics from a submerged combustion system. IOP Conference Series: Materials Science and Engineering, 52 (7), 072017. doi: 10.1088/1757-899x/52/7/072017
  11. Arghode, V. K., Gupta, A. K. (2012). Jet characteristics from a submerged combustion system. Applied Energy, 89 (1), 246–253. doi: 10.1016/j.apenergy.2011.07.022
  12. Dahikar, S. K., Joshi, J. B., Shah, M. S., Kalsi, A. S., RamaPrasad, C. S., Shukla, D. S. (2010). Experimental and computational fluid dynamic study of reacting gas jet in liquid: Flow pattern and heat transfer. Chemical Engineering Science, 65 (2), 827–849. doi: 10.1016/j.ces.2009.09.035
  13. Miao, T. C., Du, T., Wu, D. Z., Wang, L. Q. (2016). Numerical study on the effect of a lobed nozzle on the flow characteristics of submerged exhaust. IOP Conference Series: Materials Science and Engineering, 129, 012066. doi: 10.1088/1757-899x/129/1/012066
  14. Yoon, H. K., Song, K. S., Lee, S. N. (1998). Development of a High Load Submerged Combustion Burner. International Journal of Fluid Mechanics Research, 25 (1-3), 276–284. doi: 10.1615/interjfluidmechres.v25.i1-3.240
  15. Nikolsky, V. E. (2015). Intensification of heat-mass exchange processes in the immersed burning apparatus by contacting phases oscillation. ScienceRise, 7 (2 (12)), 38–42. doi: 10.15587/2313-8416.2015.46987
  16. Nikolsky, V. E. (2015). Development and study of contact-modular heating system using immersion combustion units. Eastern-European Journal of Enterprise Technologies, 4 (8 (76)), 31–35. doi: 10.15587/1729-4061.2015.47459
  17. Zadorsky, V. M. (2016). Teoriya tekhnicheskih sistem. Dnepropetrovsk, 442.
  18. Strenk, F. (1975). Peremeshivaniye i apparati s meshalkami. Leninrad: Khimiya, 268.

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Published

2017-04-29

How to Cite

Nikolsky, V., Yariz, V., & Reshetnyak, I. (2017). Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy. Eastern-European Journal of Enterprise Technologies, 2(8 (86), 39–44. https://doi.org/10.15587/1729-4061.2017.97914

Issue

Section

Energy-saving technologies and equipment