Brief description of the process of cryogenic air separation equipment
The raw air is compressed to 0.78Mpa (gauge pressure, the same below) by a compressor, and then passes through a pre cooling unit and a water separator to reduce the dew point of the raw air to く 10 ° C, and the moisture is separated in the water separator. Process air with a dew point below 10 ° C enters the purifier to adsorb and remove residual moisture, carbon dioxide, and hydrocarbons. The moisture and carbon dioxide in the air exiting the purifier are both less than 1PPm. The purified processing air enters the cold box and is cooled to saturation temperature in the main heat exchanger before entering the bottom of the distillation tower. After distillation, a portion of the high-purity nitrogen gas from the top of the distillation tower enters the main heat exchanger. While cooling the raw air, it is reheated and used as product nitrogen gas to exit the cold box. The other part of the nitrogen gas at the top of the tower is condensed into liquid nitrogen in the main condenser evaporator, and a portion of the liquid nitrogen is sent to the top of the distillation tower as reflux liquid, while the other portion is discharged from the cold box as product nitrogen. The oxygen rich liquid obtained at the bottom of the tower after distillation is air-cooled and then throttled by a throttle valve to be sent to the evaporation channel of the condenser evaporator. While condensing nitrogen gas in the condenser evaporator, it evaporates itself and goes to the main heat exchanger. After being reheated in the main heat exchanger, the oxygen enriched air enters the expander. The expanded low-temperature oxygen enriched air enters the main heat exchanger to cool the feed air, and after reheating to ambient temperature, it exits the cold box. The expanded and reheated exhaust gas is used as the regeneration gas for the purifier.
The cooling capacity required for air separation and liquefaction is mainly provided by an expander.
Air separation equipment
Deep cooling KDON series air separation equipment, main processes and characteristics:
The complete set of equipment is equipped with high-performance single machine equipment.
Patent process, lower energy consumption, and high extraction rate.
Integrated MPC system, fast load capacity, and higher liquid nitrogen production.