The oxygen separator of the gas separator manufacturer is also called air separator (or air separator), which has various classification methods, which can be divided into several types according to classification. According to the product purity, the equipment producing high purity oxygen can be divided into: equipment with pure oxygen content greater than 99.2%; low purity oxygen equipment with pure oxygen content of about 95% (also known as process oxygen); oxygen enriched equipment, equipment with purity less than 35% (also known as liquefied air). When the air separator manufacturer starts the full low pressure oxygen generator, the cooling of the main cooler needs to consume the cooling capacity, and the cooling amount required to cool it to the working temperature is also certain. One view is that the gas precooling and the fourth phase are both used to transfer part of the cooling to the main cooling, and the effect should be the same, so the precooling of the main cooling is ignored, which leads to the over cooling of the switching heat exchanger in the stage of liquid accumulation.

The air separator manufacturer shall control the difference between the hot end temperature and the cold end temperature during operation. In the adjustment, the temperature difference at the cold end should be kept within the maximum allowable temperature difference range of the self exhaust, and the temperature difference at the hot end should be minimized. The air separation equipment manufacturer blows liquid from the automatic valve box of the accumulator (or switching heat exchanger) or the return flow of the cold end of the sewage nitrogen temperature is about-180 ℃, indicating that the cold end air of the accumulator (or switching heat exchanger) has been liquefied. The harm of air liquefaction at cold end is huge, mainly including: some liquefied air is deposited in automatic valve box (or bottom of the cooler), and some of it is brought into the tower with air, which increases the water content of air in the tower and reduces the purity of liquid and air (oxygen content).

It is also known whether the plate unit of plate fin type condensing evaporator is treated by full immersion water. The immersion rate of liquid oxygen surface of the plate fin condenser can reach about 70%. Obviously, this has met the heat transfer requirements and does not affect the distillation conditions. The temperature drop of the return gas from the air separation equipment manufacturer to the accumulator will cause the temperature difference at the hot end to be too large. The ratio of the cooling capacity absorbed by the positive air to the positive air absorption is larger than that of the reverse flow and the positive air absorption in normal conditions, which causes the temperature of the outlet air accumulator to decrease, which results in the decrease of the temperature difference at the outlet end. The large-scale gate valve and pneumatic regulating valve of air separation equipment shall be installed vertically to avoid eccentric due to the large weight of valve core, which increases the mechanical wear between valve core and casing, causing leakage; when pressing the screw, the valve shall be in the micro opening state to avoid damaging the valve top sealing cover;

The air separation equipment manufacturer will bring a large amount of water to the air separation tower due to the increase of air flow rate, pressure reduction, reduction of return water and increase of water spray. When the converter is switched, the air flow impact is caused by the speed too fast, and the water bearing property appears. In order to prevent water accident, the management and operation of nitrogen water precooler should be strengthened. Theoretically, the work done by the external expansion is equal to the work consumed by compression, which is a reversible adiabatic expansion process. The entropy value is constant before and after expansion, which is called isentropic expansion. In fact, the expansion of the expander will have losses, and it is irreversible process, and entropy increases. The air separator manufacturer leads out some liquid oxygen from the bottom of the main condenser to allow it to evaporate in the auxiliary condenser. When liquid oxygen evaporates, explosive substances such as acetylene will also be concentrated. The liquid oxygen with high acetylene concentration is introduced into acetylene separator and the liquid is discharged regularly at the bottom of the separator. This explosion-proof measure is adopted in 3350m3/h air separation equipment of high and low pressure process, which prevents acetylene accumulation in main condensate evaporator and ensures the safety of main condensate evaporator.