Intensification Effect of a Multi-Jet Structure on a Multiphase Flow and Desulfurization Process in a Fluidized Bed
Shuai Wang1, Feng Wu1, Bei Bei Di1
1School of Chemical Engineering, Northwest University, Xi'an710069, China.
ACS Omega
|February 23, 2023
Summary
Introducing a middle multi-jet structure in fluidized beds significantly enhances gas-liquid-solid mixing and improves desulfurization efficiency. Optimal configuration achieves 69.3% efficiency, surpassing conventional beds.
Area of Science:
- Chemical Engineering
- Fluid Dynamics
- Environmental Technology
Background:
- Fluidized beds are crucial for industrial processes, but interphase mixing can be a limiting factor.
- Improving gas-liquid-solid mixing is key to enhancing reaction efficiencies, such as desulfurization.
- Conventional fluidized beds often face challenges in achieving uniform mixing and high efficiency.
Purpose of the Study:
- To investigate the impact of multi-jet structures on gas-liquid-solid interphase mixing and desulfurization efficiency in fluidized beds.
- To compare the effectiveness of multi-jet structures placed at the bottom versus the middle of the fluidized bed.
- To optimize the design of multi-jet structures for maximum desulfurization performance.
Main Methods:
- Computational Fluid Dynamics (CFD) simulations were employed to model gas-liquid-solid flow.
- Studies were conducted on both bottom multi-jet fluidized beds (BMJFB) and middle multi-jet fluidized beds (MMJFB).
- Parametric studies examined the effects of water flow rate, jet width, and number of jets.
Main Results:
- The middle multi-jet structure (MMJFB) demonstrated a more significant intensification of gas-liquid-solid interphase mixing compared to the bottom configuration.
- Increasing water flow rate in the MMJFB promoted mixing and desulfurization, reaching 68.2% efficiency.
- Optimal MMJFB design (20 mm jet width, four jets) resulted in uniform three-phase mixing and 69.3% desulfurization efficiency, an 18.5% improvement over conventional beds.
Conclusions:
- The placement of multi-jet structures in the middle of a fluidized bed is more effective for enhancing interphase mixing and desulfurization.
- Water spray plays a vital role in promoting mixing and efficiency in MMJFBs.
- Optimized multi-jet configurations offer substantial improvements in desulfurization efficiency compared to conventional fluidized beds.
