# Effect of Venturi Structures on the Cleaning Performance of a Pulse Jet Baghouse
## 4 Conclusions  
In this paper, the effect of venturi structures on baghouse dust cleaning performance was reported. Peak pressure and peak pressure arrival time were tested on the filter bags. On this basis, a new venturi-type tube was designed, and the influence of the new device on the cleaning cycle time and dust emission concentration of the baghouse were studied. The specific conclusions are as follows:  
1. The pulsing air pressure had a great influence on the cleaning performance of the filter bag: the greater the pulsing air pressure, the greater the peak pressure and the smaller the peak pressure arrival time. Increasing the pulsing air injection time had no significant effect on the peak pressure of the filter bag; however, it increased the peak pressure arrival time, which might have weakened the dust cleaning efficiency.
2. The smaller the venturi throat diameter, the greater the resistance of the cleaning airflow passing through the venturi, and the greater the cleaning airflow energy loss, thus reducing the peak pressure and increasing the peak pressure arrival time. In additon, the shorter the venturi length, the smaller the resistance and the cleaning airflow energy loss, the larger the peak pressure, and the shorter the peak pressure arrival time.  
Figure 16: The variation of operating resistance and dust emission concentration of baghouses adapted with a typical venturi tube or a new venturi design. **(a)** The variation of operating resistance of baghouse with the typical venturi. **(b)** The variation of dust emission concentration of baghouse with the typical venturi. **(c)** The variation of operating resistance of baghouse with the new venturi. **(d)** The variation of dust emission concentration of baghouse with the new venturi.  
Compared with the typical venturi, in the new design, the peak pressure as well as the secondary volumetric airflow entering the filter bag increased. In addition, the peak pressure distribution changed, and a positive pressure was achieved near the bag mouth. With this, the area near the filter bag mouth can be effectively cleaned and the filtering capacity properly restored. This effect is equivalent to increasing the filtration area in the vicinity of the bag mouth, compared with the typical venturi.
4. Compared to the typical venturi baghouse, the one with the new design displayed longer average cleaning cycle time and lower energy consumption. Additionally, the new venturi tube reduced the average dust emission concentration and improved the dust-collecting effect of the baghouse.  
[PERSON] had the original idea for the study and performed the research. All authors of this paper also participated directly, either in the planning, execution, or analysis of this study. [PERSON] was responsible for the recruitment and follow-up of study participant. All authors read and approved the final manuscript.  
This research was supported by the National Key Research and Development Program of China (Grant No. 2018 YFC0705300) and the Fundamental Research Funds for the Central Universities (Grant No. CUSF-DH-D-2017093).  
The authors would like to thank all the editors and reviewers who provided constructive feedback and suggestions.  
The authors declare no conflict of interest.