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)
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