Research On High-Efficient Of Gas-liquid Separator For Low Temperature Evaporation System

On the basis of previous studies, this thesis makes a further research on the low temperature gas-liquid separator. The conventional gas-liquid separator has been improved, and that been numerically simulated by the means of Fluent 12.0 in computational fluid dynamics. In-depth understanding of the basis of gas-liquid separator, different structural and operating parameters of gas-liquid separator was simulated, separation characteristics and the distribution of gas and liquid were obtained including flow field, trajectories of motion of particles, pressure drop, separation efficiency and so on, which is followed by the experiments of reliability of the structure..More than one hundred models have been set up from the preparation period when determine the model parameters of gas-liquid separator for numerical simulation till end of the experiments. By large amount of study on numerical simulation and experiment, some conclusions are obtained as follows:The mainstream is double-decked eddy in the gas-liquid separator, downward revolving eddy outside near the wall and upward revolving eddy in the center. And the orientation of all the rotations is the same.The tangential velocity plays a dominant part in the flow field of the gas-liquid separator. The tangential velocity shows the characteristic of compound vortex. The central area is the forced vortex which is in favor of outward movement of liquid particles, and the outside area is the norm free vortex which is in favor of liquid particles trapped by the wall.The distribution of the total pressure and static pressure is similar, and both are axisymmetric. It is higher that total pressure and static pressure outside near the wall than it in the center. Mainly parts of water separation are conical cylinder of the gas-liquid separator.Separation efficiency of gas-liquid separator improved efficiently with the increasing of inlet velocity, as well as the pressure loss. However, separation efficiency decreases instead with the increasing of inlet velocity if inlet velocity has increased to a value. Consequently, the 20 m /s is more appropriate. As particle diameter of water increase, the separation efficiency increases at the same inlet velocity.The diameter of overflow pipe has a great influence on separation efficiency. At the inlet velocity of 20m/s, its separation efficiency may reach up to 90% for the water particle greater than 4μm .Separation efficiency of gas-liquid separator improved slightly when increase the overflow pipe insertion depth, increased the pressure loss at the same time, and vice versa. As increase the size of inlet, separation efficiency may improve as well as the pressure loss in certain situations. The diameter of spigot have great effect on separation efficiency, a larger diameter of spigot has a better separation efficiency, until the diameter of spigot increased to a value when the separation efficiency decrease with increasing the size of spigot.With an increase of angle of inclination of gas-liquid separator, separation efficiency increased, at the same time, pressure loss increased slightly.Separation efficiency is different with difformity overflow pipe. The tapered overflow pipe is better; it even can improve separation efficiency by 30%.Separation efficiency of the gas-liquid separator with 3/4 of doughnut baffle is 15% higher for the water particle smaller than 3μm .The number of doughnut baffle prefer to be 2.