The atmospheric–vacuum unit is a collective term for the atmospheric distillation unit and the vacuum distillation unit.
● Atmospheric Distillation Unit
The atmospheric distillation column is the core equipment of an atmospheric distillation unit, featuring a multi-column composite configuration, multi-product separation, mid-section circulation heat extraction, crude oil flash vaporization, and specialized steam stripping processes. These features enable efficient separation of complex fractions under atmospheric pressure while balancing product quality and yield. The combined guide-type floating valve tray offers advantages such as high processing capacity, low pressure drop, and long service life, and has been in operation in atmospheric distillation units for over 30 years. Currently, Boneng has designed single-unit atmospheric–vacuum distillation units with capacities up to 15 million tonnes per year, and has more than ten installations of 10 million tonnes per year or greater.
● Vacuum Distillation Apparatus
Vacuum distillation is a distillation process conducted at pressures below atmospheric pressure. By reducing the system pressure, high-boiling-point substances can be distilled off at lower temperatures, thereby increasing the yield and achieving deep separation. The vacuum tower is the core equipment of a vacuum distillation unit. BN-series plate corrugated structured packings from Boneng feature low pressure drop, high throughput, and excellent resistance to high-temperature erosion, making them widely used in vacuum towers.
The BN series perforated-plate corrugated packing is a disc-shaped packing composed of numerous corrugated thin plates, featuring a compact structure and regular arrangement. Its specific surface area can be adjusted by modifying the geometry of the corrugation. The corrugations are typically inclined at either 30° or 45° relative to the tower axis. Each packing disc is installed vertically within the tower, with adjacent corrugated plates staggered in opposite directions during assembly and successive discs arranged in a 90° offset relative to one another. This mutually perpendicular arrangement causes the ascending gas stream to continuously change direction and the descending liquid to be repeatedly redistributed, ensuring thorough mixing of the fluid phases throughout the tower and thereby achieving high mass-transfer efficiency. Structurally, perforated-plate corrugated packing exhibits high mass-transfer efficiency, large throughput, low pressure drop, large specific surface area, and strong resistance to fouling—properties that enhance the separation efficiency and processing capacity of towers while reducing their pressure drops, all while delivering excellent mass-transfer and heat-transfer performance.
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