Abstract
The separation of bubbles in a gas–liquid cyclone is complicated. A combination of numerical simulation and visual experimentation was considered apt to reveal the microscopic mechanisms of bubble flow. First of all, cyclones with different structures were numerically simulated. The calculation results show that the larger the diameter of the exhaust port, the better the bubble flow effect. When the exhaust port diameter was 24 mm, the gas discharge efficiency was 8% higher than that with an exhaust port diameter of 16 mm. The sequence of the bubble flow effect of a four-structure cyclone was obtained, and the gas discharge efficiency of the cyclone with a rectangular inlet was 7% higher than that of the trapezoidal inlet. Finally, a visual experimental platform was built to compare the rectangular inlet cyclone and spiral inlet cyclone with the best bubble flow effect. In accordance with the simulation numerical calculations, the bubble flow effect of the rectangular inlet cyclone was better than that of the spiral and trapezoid inlet cyclones, and the rectangular inlet in the middle was better. This article provides a specific theory and experience to guide further research on the separation mechanism, flow field characteristics and structurally optimal design of gas–liquid cyclones.
Highlights
The gas–liquid cyclone separator is a gas–liquid separation device commonly used in petrochemical, food and other fields
The three-dimensional flow field of the adiabatic cyclone was simulated by computaThe three-dimensional flow field the adiabatic cycloneflow, wasthe simulated by computional fluid dynamics (CFD)
The flow fields and bubble flow laws in cyclones with different structures were analyzed by comprehensive theoretical analysis, CFD numerical simulation and visual experimental research
Summary
The gas–liquid cyclone separator is a gas–liquid separation device commonly used in petrochemical, food and other fields It has the advantages of a simple structure, high degassing efficiency, small installation space and simple and convenient operation. The research shows that the bubbles mixed into the oil can be effectively eliminated with an appropriate design for the structure of the cyclone separator. Wei Pengkai designed a new type of high-speed wet gas–liquid pipeline separator and concluded that the separation efficiency increases with the gas–liquid superficial velocity [22]. This study uses a combination of numerical simulation and visual experimentation to study the bubble flow states in cyclones with different structures. Through observations with high-speed cameras and the results of numerical calculations, the flow law for bubbles in a cyclone separator is revealed
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