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The bubble cap tray is the earliest tray used in industry. There are many round holes on the tray plate, and a short tube is welded on each round hole, called a riser. A "hat" is placed on the tube, called a bubble cap, and there are many strip holes around the bubble cap. When working, the liquid flows from the upper tray to the lower tray through the downcomer, and then crosses the tray plate horizontally and flows into the next tray; the gas rises from the lower tray into the riser, passes through the annular channel and then flows through the strip holes of the bubble cap to the liquid layer between the bubbles.
The structure of the bubble cap tray/plate ensures that the tray is basically leak-free. When there is a large fluctuation in gas and liquid, it can still maintain an almost constant plate efficiency. The tray is not easy to clog and has a large operating flexibility. It is selected when the tray is required to be leak-free or the liquid phase load is very small.
The bubble cap tray is one of the earliest tray types used on a large scale in industry, with mature design methods and operating experience. It has good gas contact, a large operating flexibility range, and is resistant to oil pollution and not easy to clog.
Bubble tray/plate material
1Cr18Ni9Ti stainless steel, A3 carbon steel, etc.
Other special materials such as 304L or 316L and special specifications can be customized according to user requirements.
Application occasions and application examples
──Applicable to reactive distillation, separation of certain organic products
──Benzene-methyl separation
──Nitrochlorobenzene separation
──Ethylene oxidation absorption
Bubble tray/plate specifications
Diameter: ￠300-￠4000
Plate type: bubble plate, strip bubble plate, S-type bubble plate, flat bubble plate
Flow type: single flow type, double flow type, U-type flow type, step type
Bubble tray/plate product features:
The structural feature of the bubble tray is that the tray is equipped with a bubble with a riser; the gas phase and the liquid phase are separated, and the height of the liquid layer on the tray is not supported by the air flow. Therefore, unlike some trays, there is no serious leakage during operation. It can maintain stable operation within a wide range of gas-liquid load changes. Because the liquid layer on the tray is deep, the gas and liquid can have close contact for a long time, which improves the efficiency of the tray.
Advantages: sufficient gas-liquid contact, large mass transfer area, high tray efficiency; large operating flexibility, can still maintain high efficiency when the load changes in a large range; has high production capacity and is suitable for large-scale production; not easy to clog, wide range of medium adaptation, stable and reliable operation.
Disadvantages: complex structure, high cost, troublesome installation and maintenance; large gas phase pressure drop.
Bubble tray/plate standard specifications:
1. Design and manufacturing according to: JB/T1205 "Technical conditions for trays"
JB/T212 "Round bubble caps"
SH3088 "Petrochemical tray design specifications"
2. Manufacturing tolerance according to: GB/T1804 "Tolerances of linear and angular dimensions without tolerances for general tolerances"
3. Packaging and transportation according to: JB2536 "Painting, packaging and transportation of pressure vessels"
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