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The image below shows the distillation column that we will be drilling in today. Please memorize the layout to avoid getting lost! 1. We need to climb to the top of the tall tower and explore from above; this will save us some effort. In a bit, once you see the road conditions, you’ll know just how right I am! 2. We’re coming in, look up! Look, that’s the vapor line at the very top of the distillation tower! 3. Look where you’re going! That is the baffle for the feed pipeline of the distillation tower! The purpose is to prevent the material at the feed inlet from hitting the housing directly, and at the same time to avoid the formation of rotating vortices! This causes fluctuations in the components inside the tower, and the tray gets overturned! Is the feed baffle just a broken half-cylinder? Wrong, wrong, wrong! It seems to be conical, larger at the top and smaller at the bottom! 4. Organize and rest in place, check your equipment! Beneath one’s feet lies the structure of a tray in the distillation tower, with a diameter of 1600 mm, which is just enough to allow short people to lie down on it. At the 12 o’clock direction are the overflow weir and downcomer. No one told you that the downcomer has to be a circular tube! ! ! In the 3 o’clock direction are the equipment brought for this exploration: gloves, a flashlight, a level, and a camera. In the 7 o’clock direction is a bottle, which contains the “urine” left behind by the workers! In the middle is the passage panel, which represents the route of our exploration this time. 800mm*350mm – it’s very cramped, and that’s why we need to explore from top to bottom! After we finish our inspection, it needs to be sealed! 5. The following figure shows the details of the downcomer: it’s flooded, that is, the liquid has filled this area completely! It completely prevents the liquid layer from passing through! 6. The following figure shows the details of the overflow weir. Please consciously ignore that bottle of yellow liquid. It really isn’t me! At 1 o’clock, the F direction is the manhole through which we entered! Knowledge point: The height of the overflow weir determines the liquid layer thickness of that tray level. If it is too high, the liquid level will rise, increasing the pressure drop in the tower! Conversely, the pressure resistance of the tower decreases! 7. Use a level to check the levelness of the tray! Generally, the prefabricated components are already determined; unless the assembly workers are extremely incompetent, there won’t be significant deviations. Knowledge point: A poor levelness, just like the barrel principle, will definitely lead to a decrease in the liquid layer thickness of that tray level! It needs to be reassembled! Knowledge point: Additionally, it is necessary to confirm whether the direction of the guiding float valve is correct! ! ! The opening direction of the guide hole is aligned with the liquid flow direction on the tray, reducing or eliminating the liquid level gradient. The gas phase exits through the pores and passes through the liquid layer to achieve gas-liquid mass and heat transfer! 8. Look down! The image below shows workers inspecting the trays on each layer. 9. Look up! That’s the upper tray! Check whether the claws of the floating valve are damaged. If it gets damaged, it affects the opening of the floating valve, and the gaseous material cannot pass through this floating valve! 10. The image below shows workers checking the bottom clearance of the downcomer! Knowledge point: The gap at the bottom of the downcomer (the distance between the bottom of the downcomer and the tray) ho should be less than the height of the overflow weir hw, so that gas cannot enter the downcomer. Did you notice that small ring-like tube in the worker’s hand? This is a magical item! ! ! ! Height: 50 mm (our design requires the overflow weir to be 50 mm high; it can be customized according to specific requirements). It can be used to quickly measure whether the height of the overflow weir is 50 mm, as well as to check whether the bottom clearance is below 50 mm. If the bottom gap is too large, gas bypasses it, and the liquid layer gaps extend to the upper tray. The bottom clearance is too low, which reduces the flow velocity of the liquid in the downcomer and can easily lead to flooding. Below is the check for the bottom clearance height: below 50mm, it’s acceptable! 11. Finally, here are Guan Guan’s big feet! Guess the shoe size! Although it is over ten meters tall, I’m not afraid at all sitting on the edge. Because the gap is too small; I’m fat, so I can’t get through! It can’t fall! ! ! For towers with a larger diameter and wider access panels, be careful when checking them from above or below to avoid slipping! 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