THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

ABSTRACT
Sufficient heat storage and proper flue-gas outlet temperature were prerequisites for selective non-catalytic reduction (SNCR) denitrification in coke oven regenerators. This work performed an energy balance analysis on the established regenerator model to obtain a new thermal storage evaluation index-Total thermal storage temperature (TTST). Furthermore, ten cases of thermal storage parameters were set to analyze the effects of thermal effusivity and thermal diffusivity on heat storage and transfer. The transient simulation results shown that the channel shape of the lattice brick limited the uniformity of fluid-solid heat transfer and temperature distribution during the 30min commutation period, and the temperature window (1100~1300K) suitable for SNCR denitration slowly moved down. The increase of thermal effusivity led to the rise of heat storage and reduction of flue-gas outlet temperature. However, the transform in thermal diffusivity did not contribute substantially to the heat storage performance. Besides, the temperature-time-height equation obtained by fitting was used for predicting the suitable location of SNCR denitration temperature. The TTST was positively correlated with the flue-gas outlet temperature and negatively correlated with the heat storage capacity. The TTST evaluated the effects of material properties on heat storage and flue gas outlet temperature.
KEYWORDS
PAPER SUBMITTED: 2019-07-15
PAPER REVISED: 2019-11-07
PAPER ACCEPTED: 2019-11-13
PUBLISHED ONLINE: 2019-12-22
DOI REFERENCE: https://doi.org/10.2298/TSCI190715446Z
REFERENCES
  1. Zhao, B., et al., Nonlinear relationships between air pollutant emissions and PM2.5-related health impacts in the Beijing-Tianjin-Hebei region, Sci. Total. Environ., 661. (2019), pp. 375-385.
  2. Yang, H., et al., The contribution of the Beijing, Tianjin and Hebei region's iron and steel industry to local air pollution in winter, Environ. Pollut., 245. (2019), pp. 1095-1106.
  3. Liu, X., et al., Emission characteristics of aviation kerosene combustion in aero-engine annular combustor with low temperature plasma assistance, Therm. Sci..23, (2018), 2, pp. 138-138.
  4. Zhou, H., et al., Optimization of ammonia injection grid in hybrid selective non-catalyst reduction and selective catalyst reduction system to achieve ultra-low NOx emissions, J.Energy.Inst., 91. (2018), 6, pp. 984-996.
  5. Yu, J., et al., Sulfur poisoning resistant mesoporous Mn-base catalyst for low-temperature SCR of NO with NH3, Appl. Catal. B-Environ., 95. (2010), 1-2, pp. 160-168.
  6. Yu, J., et al., The pilot demonstration of a honeycomb catalyst for the DeNOx of low-temperature flue gas from an industrial coking plant, Fuel, 219. (2018), pp. 37-49.
  7. Buczynski, R., et al., Investigation of the heat-recovery/non-recovery coke oven operation using a one-dimensional model, Appl. Therm. Eng., 144. (2018), pp. 170-180.
  8. Jin, K., et al., Simulation of transport phenomena in coke oven with staging combustion, Appl. Therm. Eng., 58. (2013), 1-2, pp. 354-362.
  9. Belosevic, S., et al., Modeling of pulverized coal combustion for in-furnace NOx reduction and flame control, Therm. Sci., 21. (2017), suppl. 3, pp. 597-615.
  10. Hodzic, N., et al., Influence of over fire air system on NOx emissions: An experimental case study, Therm. Sci., 23. (2019), 3 Part B, pp. 2037-2045.
  11. Gamrat, S., et al., Influence of external flue gas recirculation on gas combustion in a coke oven heating system, Fuel Processing Technology, 152. (2016), pp. 430-437.
  12. Chunming, L., Application of exhaust gas reuse combined with SNCR method in denitrification of coke oven gas, Beijing University of Chemical Technology,2017.
  13. Kesong, C., Study on the technology of flue gas denitrification in coke oven thermal storage chamber, Shandong Metallurgy, 38. (2016), 2, pp. 45-46.
  14. Jiandong., C., Application of Combined Desulfurization and Denitration Technology in Coke Oven Flue Gas Treatment, Sino-global Energy, 23. (2018), 12, pp. 83-89.
  15. Dante, R.C., Metals, 2016.
  16. Streza, M., et al., Thermal effusivity investigations of solid materials by using the thermal-wave-resonator-cavity (TWRC) configuration. Theory and mathematical simulations, Laser Physics, 19. (2009), 6, pp. 1340-1344.
  17. Yang Shiming,T. Wenquan., Heat Transferology. 4th Edition. Higher Education Press, 2006.
  18. Fluent, I., FLUENT 6.3 User's Guide. (2006).
  19. You, Y., et al., A three-dimensional numerical model of unsteady flow and heat transfer in ceramic honeycomb regenerator, Appl. Therm. Eng., 108. (2016), pp. 1243-1250.
  20. Kamburova, V., et al., Numerical modelling of the operation of a two-phase thermosyphon, Therm. Sci., 22. (2018), Suppl. 5, pp. 1311-1321.
  21. Yuan, F., et al., Heat transfer performances of honeycomb regenerators with square or hexagon cell opening, Appl. Therm. Eng., 125. (2017), pp. 790-798.
  22. Xu, Q., et al., Influence of end side displacement load on stress and deformation of "L"-type large-diameter buried pipe network, Appl. Therm. Eng., 126. (2017), pp. 245-254.