Super low pressure drop packing sheet with diversion windows and its structured packing

摘要

A low pressure drop structured packing sheet with diversion windows, which are formed on both crests and troughs. When in the expanded state where the diversion window and packing sheet are flat on the same plane, the diversion window has an opening and a fan-shaped portion, with the area of the opening being 0%-1000% of that of the fan-shaped portion. Two side intersection lines between the fan-shaped portion and packing sheet is symmetrical with respect to a central folding line which divides the fan-shaped portion into a left part and a right part. The two side intersection lines intercept to each other with an angel of about 10°-170°. When in the operating state where the diversion window and packing sheet are partially folded towards opposite directions, the fluid at the trough flows to a crest of the other side of the packing sheet with the help of diversion windows, thus increasing the area of vapor-liquid mass transfer. Additionally, when liquid goes across the diversion window, liquid at the bottom of the layer flow becomes the liquid on the liquid film, hence effectively facilitating update of the liquid film and turbulence, increasing mixture between the liquid and vapor, and improving rate of the mass transfer between vapor and liquid.

主权项

1. A low pressure drop structured packing sheet, comprising a plurality of diversion windows and assuming an expanded state or an operating state, wherein, in said expanded state, said diversion windows and the rest of the packing sheet are on the same plane, each of said diversion windows comprises an opening defined by an upper side and a lower side and a fan-shaped portion, said opening and said fan-shaped portion share a same width h, said fan-shaped portion has a left part and right part divided by a central folding line and being symmetric with respect to said central folding line, said left part is between said central folding line and a left side line, said right part is between said central folding line and a right side line, and said left side line and said right side line intercept with an angle α of 10°-170°; and in said operating state, the packing sheet is partially folded along a polarity of parallel folding lines to assume a corrugated form with a plurality of crests and troughs, and said diversion windows are also partially folded along said central folding line with an angle β3 of 10°-170° between said left part and right part of said fan-shaped portion.