In the main tower of the air separation tower, the distribution of argon varies with the position of the liquid air inlet. As the position of the liquid air feed inlet increases, the maximum concentration of argon in the enrichment zone of the distillation section also increases, while reducing the nitrogen content in the fraction. However, the argon content in the downstream fluid also increases. To ensure oxygen purity, more trays are required below the argon fraction extraction port. Therefore, when producing argon, the liquid air feeding position should be appropriately raised compared to when not producing argon. Some equipment is equipped with two liquid air inlet positions, which meet the working conditions of producing argon and not producing argon.
In order to improve the extraction rate of argon during the production of argon, it is necessary to reduce the argon content in oxygen and nitrogen. When the argon content in nitrogen removal exceeds 0.3% and the argon content in product oxygen is 0.7%, the extraction rate of argon cannot exceed 60%. Therefore, when equipped with an argon tower, the number of trays in the main tower is greater than when not equipped with an argon tower. Increasing the number of lower tower plates can improve the purity of liquid nitrogen; Increasing the number of trays in the distillation section can improve the purity of nitrogen removal, reduce the amount of argon carried away by nitrogen, and increase the extraction rate of argon. Increasing the number of trays from the distillate to the main cooler is beneficial for the separation of argon and oxygen, which can increase the argon content in the argon fraction and reduce the argon content in liquid oxygen.
DEAR Gas mainly produces conventional gases such as oxygen, nitrogen, argon, and carbon dioxide, and actively develops rare gases such as helium, neon, krypton, xenon, and other special gases.
