Evaluating the cleaning performance of rectangular slot nozzle and diffuser

Evaluating the cleaning performance of rectangular slot nozzle and diffuser

Haixia LiZhendong Hao Qi Zhang 

School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Corresponding Author Email: 
18 September 2017
| |
22 December 2017
| | Citation



This paper aims to disclose how the pulse gas performance is affected by the configurations of the rectangular slot nozzle and the cake-pie type diffuser. To this end, the pulse gas performance of the nozzle was evaluated through several simulations based on the computational fluid dynamics (CFD). Specifically, the author briefly introduced the nozzle and the diffuser, the modelling and meshing operations, the governing equations of the CFD, as well as the numerical plan and solution convergence. Then, the simulation model was validated by comparing the simulated results with experimental data. Focusing on the flow field around the nozzle, the effects of nozzle configuration, diffuser configuration and nozzle-diffuser distance on pulse gas cleaning were discussed in great details. Through the discussion, the author drew the following conclusions: Obvious shocking waves were observed near the nozzle outlet. The nozzle outlet height has a greater impact on pulse jet cleaning than other nozzle configuration parameters (e.g. nozzle outlet width and nozzle extension width), while the diffuser height has a greater impact on pulse jet cleaning than other diffuser configuration parameters (e.g. diffuser inlet width and inlet-throat distance). The primary, secondary and total masses increased with the height and width of nozzle outlet; as the nozzle extension width grew, the secondary and total masses also increased, but the primary mass stayed the same. The entrainment ratio is negatively correlated with the height and width of nozzle outlet, and positively with nozzle extension width. The primary mass had nothing to do with the diffuser configuration, while the secondary mass, the total mass and the entrainment ratio increased with the diffuser height, the diffuser width and the nozzle-diffuser distance. The research findings provide a valuable theoretical guidance for pulse jet cleaning system of filters.


rectangular slot nozzle, diffuser, pulse jet cleaning, computational fluid dynamics (CFD)

1. Introduction
2. Methodology
3. Results and Discussion
4. Conclusions

[1] Vehlow J. (2014). Air pollution control systems in WtE units: An overview. Waste Management 5: 1-17. https://doi.org/ 10.1016/j.wasmann.2014.05.025

[2] Choi JH, Seo YG, Chung JW. (2001). Experimental study on the nozzle effect of the pulse cleaning for the ceramic filter candle. Powder Technology 114: 129-135.

[3] Dittler A, Ferer MV, Mathur P, Djuranovic P. (2002). Patchy cleaning of rigid gas filters\transient regeneration phenomena comparison of modeling to experiment. Powder Technology 124: 55-66.

[4] Hashaikeh R, Lalia BS, Kochkodan V, Hilal N. (2014). A novel in situ membrane cleaning method using periodic electrolysis. Journal of Membrane Science 471: 149-154. https://doi.org/ 10.1016/j.memsci.2014.08.017 

[5] Li HX, Li B, Bai X. (2015). Three dimensional modeling of gas-solid coupled free and Porous flow in a filtration process. International Journal of Heat and Technology 33: 101-106.

[6] Sharma SD, Mclennan K, Dolan M, Nguyen T, Chase D. (2013). Design and performance evaluation of dry cleaning process for syngas. Fuel 108: 42-53. https://doi.org/ 10.1016/j.fuel.2011.02.041

[7] Morris WJ. (1984). Cleaning mechanisms in pulse jet fabric filters. Filtration and Separation 21(1): 50-54.

[8] Theodore I, Reynolds I, Corvini A, Buonicore A. (1975). Particulate control by pulsed-air bag-house filtration: describing equations and solutions. Proceedings of 2nd Speciality on the User and Fabric Filtration Equipment, Buffalo ed.: 90.

[9] Choi JH, Sakong KM, Chi HC, Ji ZL. (2008).Aspects of nozzle effect on the pulse jet cleaning of a ceramic filter. 10th World Filtration Congress, April 14-18, Leipzig, German 3: 378-382.

[10] Subramanian G, Natarajan SK, Adhimoulame K, Natarajan K. (2014). Comparison of numerical and experimental investigations of jet ejector with blower. International Journal of Thermal Sciences 84: 134-142. https://doi.org/ 10.1016/j.ijthermalsci.2014.05.008 

[11] Lo LM, Chen DR, Pui DYH. (2010). Experimental study of pleated fabric cartridges in a pulse-jet cleaned dust collector. Powder Technology 197: 141-149. https://doi.org/ 0.1016/j.powtec.2009.09.007

[12] Weidemann C, Vogt S, Nirschl H. (2014). Cleaning of filter media by pulsed flow – Establishment of dimensionless operation numbers describing the cleaning result. Journal of Food Engineering 132: 29-38. https://doi.org/ 10.1016/j.jfoodeng.2014.02.005

[13] Yan CP, Liu GJ, Chen HY. (2013). Effect of induced airflow on the surface static pressure of pleated fabric filter cartridges during pulse jet cleaning. Powder Technology 249: 424-430. https://doi.org/ 10.1016/j.powtec.2013.09.017

[14] Qian YL, Bi YX, Zhang Q, Chen HY. (2014). The optimized relationship between jet distance and nozzle diameter of a pulse-jet cartridge filter. Powder Technology 266: 191-195. https://doi.org/ 10.1016/j.powtec.2014.06.004

[15] Berbner S, Lӧffler F. (1993). Pulse jet cleaning of rigid filter elements at high temperature. In: Proceedings of 2nd International Symposium on Gas Cleaning at High Temperatures, Chapman & Hall: 225-243

[16] Stӧcklmayer CH, Hӧflinger W. (1998). Simulation of long-term behavior of regenerateable dust filters. Filtration and Separation 5: 373-377

[17] Stӧcklmayer CH, Hӧflinger W. (1998). Simulation of the regeneration of dust filters. Mathematics and Computers in Simulation 46: 601-609.

[18] Zhang X, Chen HH, Ji ZL. (2009). Characterization of flow field in the exit of pulse Jet Nozzle for High-temperature Filtrating. Chinese Journal of Mechanical Engineering 45(10): 96-100.

[19] Lo LM, Chen DR, Pui DYH. (2010). Experimental study of pleated fabric cartridges in a pulse-jet cleaned dust collector. Powder Technology 197: 141-149. https://doi.org/ 10.1016/j.powtec.2009.09.007

[20] Duo W, Kirkby NF, Seville JPK, Clift R. (1997). Patchy cleaning of rigid gas filters-I. A probabilistic model. Chemical Engineering Science 52(1): 141-151.

[21] Ramy H. (2013).A simplified method for modeling of round and square ceiling diffusers, Energy Buildings 64: 473-482. https://doi: 10.1016/j.enbuild.2013.05.021

[22] Durst SM. (1994). Advatage of an integration system for hot gas filtration using rigid ceramic elements. Filtrion and Separation 6: 25.

[23] Gregg W, Ridge B, Vendetti R, Hiawatha L, Lindsay R. (1995). Low pressure pulse jet dust collector. US Patent 421(5): 845.

[24] Bounaouara H, Ettouati H, Ticha HB, Mhimid A, Sautet JC. (2015). Numerical simulation of gas-particles two phase flow in pipe of complex geometry: Pneumatic conveying of olive cake particles toward a dust burner. International Journal of Heat and Technology 33: 99-106.

[25] Chen N. (2015). Impact of vertical wind deflectors installed at parapet of residential balcony on indoor air flow and temperature. Oxidation Communications 38(2): 923-935.

[26] Hao PF, Gao JZ, Si WJ, Zhang P. (2015). Research on flow pattern of nitrogen tetroxide liquid in the valve during start and shutdown operation. Oxidation Communications 38(2): 994-1000.

[27] Shuai Li, Dawei Liu, Qiang Li. (2015).The optimal design of a wind tunnel model sting system based on the CFD method. International Journal of Heat and Technology 33: 137-144.

[28] Yi Q.J, Tian MC, Fang D. (2015). CFD simulation of air-steam condensation on an isothermal vertical plate. International Journal of Heat and Technology 33: 26-32.