Numerical and Experimental Study on a New Separation Device for Gas-Solid Two-Phase Flows

Abstract

A novel separation device is designed to separate solid particles from the high-temperature, high-pressure dusty gas based on oblique shock wave theory. Two-dimensional numerical simulations and a series of experiments of the separation of the supersonic gas-solid two-phase flow are carried out. The aim is to validate the conditions for realizing the gas dedusting and to study the performance of the separation device. It is found that the gas dedusting can be realized only when the physical interface which basically overlaps the geometrical interface are stable and the design flow velocities at the dust-carrying and dust-absorbing nozzles are close to each other. Besides, the experimental results show that 57.83%∼67.28% particles with a sauter average diameter of 9.84 µm can be separated by the experimental device. 75.73%∼80.15% particles with diameters above 8.31 µm and 96%∼100% particles with diameters above 15 µm can also be separated. Larger particles correspond to higher separation efficiency. The same conclusions are also drawn from the numerical simulation results. The study indicates that the present method for the separation of gas-solid two-phase flow is feasible and highly efficient.

Keywords:

• oblique shock wave
• separation efficiency
• separation equipment
• separation of gas solid two phases
• supersonic gas flow

ACKNOWLEDGEMENTS

The authors acknowledge financial support from the National Natural Science Foundation of China (No. 50806059).