In order to improve the working performance of the ceramic catalyst filter, a model of nozzle blowback was designed to change the nozzle diameter. The blowback tube blowback model with variable diameter and the blowback blowback model with equal diameter were used for backflush simulation analysis. Also the influence of the sum of the injection tube inlet velocity, nozzle length, and nozzle cross-sectional area on the uniformity of backflush was studied. Through simulation analysis, it can be obtained that the outlet flow of nozzles with equal diameters and blowback models increases gradually from front to back; the variable-diameter blowback model can make the nozzle outlet flow uniform, but the nozzles at both ends still deviate from the average flow; continuing to change the nozzle diameter. The nozzle outlet flow can continue to be uniform; different boundary conditions and sizes can affect the uniformity of the backflush: the smaller the inlet velocity of the injection tube, the larger the nozzle length, the smaller the sum of the nozzle areas, and the more uniform the nozzle outlet flow.

References

1. 1)
  - 14. Lu, H.C., Tsai, C.J.: ‘Influence of design and operation parameters on bagcleaning performance of pulse-jet baghouse’, J. Environ. Eng., 1999, 125, (6), pp. 583–591.
2. 2)
  - 12. Smith, D.H.: ‘Analysis of operational filtration data part II: incomplete cleaning of candle filters’, Powder Technol., 1998, 9, pp. 139–145.
3. 3)
  - 3. Matthias, V.: ‘The contribution of ship emissions to air pollution in the north Sea regions’, Environ. Pollut., 2010, 158, (6), pp. 2241–2250.
4. 4)
  - 10. Djerad, S. ‘Effect of oxygen concentration on the NOX reduction with ammonia over V2O5-WO3/TiO2 catalyst’, Catal. Today, 2006, 113, pp. 208–214.
5. 5)
  - 2. Blasco, J.: ‘Towards an integrated environmental risk assessment of emissions from ships’ propulsion systems’, Environ. Int., 2014, 66, pp. 44–47.
6. 6)
  - 8. Min, K.: ‘Manganese oxide catalysts for NOX reduction with NH3 at low temperatures’, Appl. Catalysts A: Gen., 2007, 327, (2), pp. 261–269.
7. 7)
  - 15. Schildermans, I, Baeyens, J, Smolders, K.: ‘Pulse jet cleaning of rigid filters: a literature review and introduction to process modeling’, Filtr. Sep., 2004, 41, (6), pp. 26–33.
8. 8)
  - 6. Prins, W.L., Nuninga, Z.L.: ‘Design and experience with catalytic reactors for SCR (selective catalytic reduction)-DeNOx’, Catal. Today, 1993, 16, (2), pp. 187–205.
9. 9)
  - 9. Nunzion, R.: ‘N2O catalytic decomposition over various spinel-typeoxides’, Catal. Today, 2007, 119, (14), pp. 228–232.
10. 10)
  - 4. Baltin, G, Koser, H, Wendlandt, K.: ‘Reactive desorption of sulfuric acid from ammoniumsulfate loaded V205–W03/Ti02 DeNOx – catalysts’, Chem. Ing. Tech., 2001, 73, (6), p. 605.
11. 11)
  - 13. Lu, H.C., Tsai, C.J.: ‘A pilot-scale study of the design and operation parameters of a pulse-jet baghouse’, Aerosol Sci. Technol., 1998, 29, (6), pp. 510–524.
12. 12)
  - 11. Djerad, S., Tifouti, L., Crocoll, , et al: ‘Effect of vanadia and tungsten loadings on the physical and chemical characteristics of V2O5-WO3/TiO2 catalysts’, Mol. Catal. A: Chem., 2004, 208, pp. 257–265.
13. 13)
  - 7. Baik J, H, Yim S, D, Nam, I, et al: ‘Control of NO × emissions from diesel engine by selective catalytic reduction (SCR) with urea’, Topics in Catal., 2004, 30, (1), pp. 37–41.
14. 14)
  - 5. Ahluwalia R, K, Geyer H, K.: ‘Fluid mechanics of membrane-coated ceramic filter’, Eng. Gas Turbines Power, 1996, 118, (3), pp. 526–533.
15. 15)
  - 1. Contini, D.: ‘Inter-annual trend of the primary contribution of ship emissions to PM2.5 concentrations in Venice (Italy): efficiency of emissions mitigation strategies’, Atmos. Environ., 2015, 102, pp. 183–190.

Research on airflow uniformity of marine selective catalytic reduction reverse blow system

References

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