新型旋流降膜式洗涤冷却环的开发与研究

洗涤冷却环是水煤浆气化炉的关键部件之一，洗涤冷却水通过洗涤冷却环的分布，在洗涤冷却管内壁形成液膜，使高温合成气体迅速冷却，针对目前工业应用中的洗涤冷却环存在的液膜分布不均、抗堵塞能力差等缺点，开发了新型旋流降膜式洗涤冷却环。用激光多普勒测速仪（Dual PDA）研究了旋流降膜流动的速度及液膜厚度分布，得出降膜的轴径向速度与进水流量的均匀性及量值有关；液膜厚度在z=0．5m处趋于稳定；并比较了新型洗涤冷却环和普通洗涤冷却环的液膜分布，证明新型洗涤冷却环液膜分布均匀，能有效解决工业中存在的洗涤冷却管干壁现象。

Development of a New Rotary Falling Film Quench Ring for Scrubbing and Cooling Hot Syngas

Quench ring is a key component of a coal water slurry gasifier. Hot process gas is quenched by contacting with black water in falling film formed on the inner wall of the vertical tube after it flows through the quench ring. A new rotary falling film quench ring for washing and cooling the hot process gas was developed without the shortcomings of the conventional quench ring. The velocity and thickness of rotary falling film in a vertical tube were measured using Dual partical dynamics analysis. The velocity of the falling film was affected by both distribution and flowrate of water influent, and the thickness tended to be steady at z=0.5 m. Relative to the conventional quench ring, the new ring produced more uniform falling water film on the inner tube.