The design of piping in the cold box of liquid air separation plant is complex and troublesome, and each pipeline has its own process requirements. As one of the most complex components in the cold box ofliquid air separation plant low temperature piping is the key to ensure the stable and safe operation ofliquid air separation plant. A set ofliquid air separation plant in the cold / hot end of the plate fin heat exchanger piping as a module, the design approach has been standardized. Plate fin heat exchanger hot end of the pipeline directly through the plate cold box top plate, the collection of tubes arranged outside the cold box, the hot end and the cold end of the relative airflow to the same into the same U-shaped collection of the form of layout. Such a piping arrangement is relatively simple, convenient for installation and inspection of liquid air separation plant.
In large air separation plant, the longitudinal distance between the oxygen and nitrogen distillation towers and the plate fin heat exchanger increases with the expansion of the scale ofliquid air separation plant, where the piping compensation is designed to be achieved mainly through smaller diameter branch pipes.The piping connecting the plate fin heat exchanger to the liquid-air-liquid-nitrogen subcooler is the largest diameter piping in a set of liquid air separation plant. By adjusting the position of the liquid-air liquid-nitrogen subcooler and the main tower, the stress value can be effectively reduced and a safer piping design pattern can be achieved.
When designing air separation unit, Dear air separation not only meets the gas-liquid stability during normal operation, but also conducts a comprehensive evaluation of all aspects of manufacturing, installation, operation, parking and maintenance to ensure that each set of liquid air separation plant is designed to meet safety and efficiency standards.
