Visualization experiment device for deep cryogenic two-phase countercurrent process

Abstract

The invention discloses a visualization experiment device for a deep cryogenic two-phase countercurrent process. The visualization experiment device comprises a liquid collecting section, a testing section, a flange plate and a liquid inlet taper pipe, wherein the liquid collecting section is welded with an air inlet pipe and a liquid outlet pipe; inner and outer pipes in the testing section are two concentric transparent organic glass round pipes with different diameters, the inner pipe is a cryogenic fluid passageway, the upper end of the inner pipe is provided with a liquid inlet, and the lower end of the inner pipe is provided with a gas inlet; and an interlayer between the inner pipe and the outer pipe is vacuumized for heat insulation. The two ends of the outer pipe are connected with metal flanges, the upper end of the inner pipe is connected with a flange, and the lower end of the inner pipe is sequentially connected with a horn-shaped metal connection component and a corrugated pipe. The corrugated pipe is welded with a flange of the liquid collecting section through a transition member. The flange surfaces of the upper ends of the two pipes are level, and the flange surfaces of the lower ends of the two pipes and the flange surface of the liquid collecting section are sealed through polytetrafluoroethylene gaskets and bolts. A cylindrical metal liquid reservoir is welded onto the other side of the lower flange of the inner pipe, and is coaxial to and communicated with the inner pipe. According to the visualization experiment device for the deep cryogenic two-phase countercurrent process, the visualization of the deep cryogenic two-phase countercurrent process can be realized, and deep cryogenic vacuum insulation problem can be solved.

Description

technical field [0001] The invention relates to a low-temperature fluid flow experiment device, in particular to a visualization experiment device for a deep-low temperature two-phase countercurrent process. Background technique [0002] Today's large-scale air separation systems generally use structured packing columns instead of tray columns to realize the heat and mass transfer process between vapor and liquid. In the structured packing tower, the liquid air flows downward in the form of a liquid film along the surface of the packing under the action of gravity, while the low-temperature gas flows upward along the gap between the packing and the liquid film, forming a countercurrent flow with the liquid. When the relative speed of the two reaches a certain value, the flooding phenomenon is caused, that is, part or all of the downward liquid is taken away by the upward gas, and the pressure drop of the gas rises sharply. The flooding phenomenon is the main factor limiting...

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Problems solved by technology

However, neither of the above two devices can realize the function of observing the flow state

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