The generation and accumulation of liquid in the main cooling system rely entirely on the liquid air section of the lower tower flowing into the upper tower. When there is a liquid void in the lower tower and it is throttled to the upper tower, some of the liquid vaporizes after throttling, and the temperature further decreases. Continue cooling the upper tower with these low-temperature liquids and gases. Initially, due to the high tower temperature, the liquid air gradually vaporized during the downstream process, and liquid could not accumulate in the main cooling system. As the liquid air continues to flow downwards from the liquid air inlet, the tray gradually cools from top to bottom, and a portion of the liquid will begin to accumulate on the tray. It relies on the vapor generated by the gasification of another part of the downstream liquid to hold the liquid. Therefore, before the liquid level appears in the main cooling system, a layer of liquid is first laid on each tray from the liquid inlet to the main cooling system, and continuously generated rising steam passes through the liquid layers on each tray. The resistance meter from the bottom can reflect the resistance that steam overcomes when passing through the tray. During the start-up phase, when the resistance gauge at the bottom of the upper tower begins to indicate, it can be estimated that the liquid oxygen surface is about to appear.
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