## 3 Results and Discussion
### Flow Field Analysis for Multi-Chamber Model
#### 3.1.2 Filtration Flow Distribution of Filter Bags  
To examine the flow distribution characteristics of filter bags within different chambers of the multi-chamber model, this study analyzed nine filter bags located at positions Z1-X1, Z1-X7, Z1-X13, Z8-X1, Z8-X7, Z8-X13, Z15-X1, Z15-X7, and Z15-X13 in each chamber. These filter bags were selected from both regions near the chamber walls and the central area of the filter chamber, enabling a comparison of flow distribution variations at various locations within the chamber. Figure 8 illustrates the variation curves of the center axis velocity along the \(Y\)-axis for each filter bag.  
As shown, the center axis velocities of the filter bags fluctuate significantly along their length, reflecting differences in filtration velocity and wear across different lengths of the bags. Specifically, a sharp increase in velocity is observed for all filter bags within the range of \(-1\) m to \(0\) m. This is primarily due to the conversion of kinetic energy into pressure energy as the upward airflow encounters resistance from the tubesheet, allowing a substantial volume of air to enter the filter bags. Furthermore, the velocity distribution trends along the center axis of filter bags at the same position within different chambers remain generally consistent, with only minor variations. These differences are most pronounced in the middle section of the filter bags (from \(-5\) m to \(-1\) m), while the velocity distribution in the inlet section (\(-6\) m to \(-5\) m) and outlet section (\(-1\) m to \(0\) m) shows little variation.  
Through comparative analysis, it is evident that the center axis velocity curves of filter bags at different positions within the same filter chamber exhibit notable discrepancies, particularly along the \(Z\)-axis (the airflow inlet direction). The velocity fluctuations are most significant for the filter bags in the \(Z_{1}\) row, while the velocities of the filter bags in the \(Z_{8}\) and \(Z_{15}\) rows remain relatively stable in the \(-5\) m to \(-1\) m range. This indicates a considerable degree of unevenness in the flow distribution near the outer chamber walls along the airflow inlet direction.  
In conclusion, the flow field distribution in each chamber of the multi-chamber bag filter shows a similar pattern, but all chambers exhibit uneven flow near the outer walls.  
Figure 8: Velocity variation curve of the center axis of different filter bags in each chamber along the \(Y\)-axis.  
The high-velocity inlet airflow, upon colliding with the walls, diffuses laterally, significantly affecting the internal flow field distribution within the filter chamber. This distribution pattern primarily arises from the fact that, upon entering the hopper, part of the high-velocity airflow ascends along the hopper walls and enters the filter chamber. As a result, higher airflow velocities are observed near the outer chamber walls, and the airflow moves laterally along the walls, leading to uneven flow distribution at the upper corners of the chamber. This phenomenon results in increased scouring of the filter bags located near the walls and top corners, significantly reducing their lifespan compared to those positioned in the central regions. Consequently, the wear on the filter bags is uneven, making it difficult to identify the identification of damaged bags and increasing the costs associated with bag replacement.