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Bubble cap Tray
A bubble cap tray is the oldest type of tray. It was widely used in the early years of chemical process industry because it is suitable for small capacity and has high efficiency.
Now, however, Valve trays and sieve trays are common. Bubble cap units come in a variety of types, the most common of which are a slotless bubble cap and a slotted bubble cap. Vapor flows through the riser pipe and the slot area of the cap to contact the liquid.
The operating range of the bubble cap tray is 10:1 which is so wide that it is easy to operate. If this tray is sealed completely, it can be of use for low liquid and vapor flows due to low leakage rates. Compared to the valve tray, however, it costs high and its process capacity is low. In addition, its hydraulic gradient is uneven, so it leads to pressure loss and unstable operating factors. For these reasons, it is little used for normal distillation; rather, it is mostly used for the wash section of a caustic tower, a glycol contactor, etc.
A sieve tray is a low-cost type of tray by which a bubble cap tray is replaced. It has been used as separation equipment for a long time since it was developed in the early 1950’s. If it is properly designed, it gets abreast of any other tray in efficiency and capacity. In addition, the structure is simple, so it can also be used for fouling service.
Perforations are 1/2 inch diameter, but we can provide designs with various hole sizes ranging from 1/8 inch to 1 inch. The smaller the hole size, the better the efficiency. If the hole size is big, it has better anti-fouling characteristics.
Sieve trays cost relatively low, and they make maintenance easy. Meanwhile, their drawback is that the turndown ratio is lower than that of valve trays and bubble cap trays, so they are not suitable to operate at variable loads. For these reasons, they are the most economical tray option when low turndown is required.
A valve tray was developed to improve a drawback that a sieve tray has a narrow operating range. Different types and characteristics of valve trays are made by different companies. Common valve trays are circular, but sometimes square valve trays are also used. According to use, standard valves, caged valves, and venturi valves are available.
The operating range is generally 3:1, but it can be extended up to 7:1 if two different weight valves are used. Valve trays have higher process capacity and flexibility than sieve trays, but they are slightly more expensive.
The drawback is that it is feared that valves may be plugged. Once plugging occurs, they are hard to clean. Therefore, valve trays are most suitable for service free from polymer or plugging problems. Today, they are the most widely used tray types.
High Performance Tray
A high performance valve tray, most recently developed, can increase its capacity up to 60 % or more compared with existing trays. It is also a slightly improved type in terms of efficiency.
Our feature products are NHP valve trays which have higher process capacity and lower pressure loss than conventional trays due to their unique valve units. They are mechanically strong and make maintenance comparably easy. Especially, they have fouling resistance, so they are also favorable to fouling service. In addition, we can provide designs with the structure where NHP valves are installed under the downcomer, and the bubbling areas are maximized.