Air separation parts FAQ

What should be paid attention to during the operation of liquid oxygen and liquid nitrogen evaporators in air separation equipment

Molecular sieve (also known as synthetic zeolite) is a kind of microporous crystals made up of SiO and AIO sihedron and the frame structure. There are metal cations (such as Na, K, Ca, etc.) in the molecular sieve lattice to balance the redundant negative charge in the sihedron. According to its crystal structure, the types of molecular sieve are mainly divided into: Type A, Type X, type Y, etc. TYPE A 5 r H-[2 d4 M + g4 Z % f the main component of r H-[2 d4 M + g4 Z % f is siovenate, with a Aperture of 4A (1A = 10-10 M), which is called 4A (also known as Nano A) molecular sieve; the aperture of 5A is formed by exchanging the Na + in the 4A molecular sieve with Ca +; the aperture of 3A is formed by exchanging the Na + in the 4A molecular sieve with K +, that is 3A (also known as potassium A) molecular sieve. X-TYPE The crystal structures of the aluminium silicon are different (the size of the ratio of silicon to aluminum is different), forming the molecular sieve crystal with the ...

For the old and new pressure gauge, its precision should be verified. Special pressure gauge calibrator should be used during verification. Generally, there are three common methods. 1. Liquid column type pressure gauge calibrator On the connection pipe of the calibrator, one side is connected to the checked pressure gauge, and the other side is connected to the glass tube container with mercury inside, and the glass tube is marked with scale as the pressure indication value. When the calibrator is pressurized, the mercury in the container rises from the glass tube, and the precision is corrected by comparing the reading of the pressure gauge through the rising scale value. 2. Weight type pressure gauge calibrator On the connection pipe of the calibrator, one side is connected to the checked pressure gauge, and the other side is connected to the piston with an area of 1cm2. There are many weights on the piston rod. When the supercharger presses the oil, the piston will be lifted up,...

Booster turbine expansion machine, the working medium of this unit is pressurized by the booster first, and then enters into the main heat exchanger after cooling, and then enters into the expansion machine for adiabatic expansion to generate the cooling required by the air separation equipment, at the same time, the mechanical power produced is absorbed by the booster The working medium enters the volute through the inlet pipe, then enters into the working wheel to work through the adjustable nozzle, and then is discharged through the expansion chamber and exhaust pipe. The air volume adjustment of the expansion machine is realized by the pneumatic film actuator installed on the top of the cold box to drive the blade of the nozzle to rotate, thus changing the sectional area of the channel, the stroke of the valve stem of the actuator reflects the change of the width of the nozzle channel. The total stroke of the valve stem is about 40mm. The downward movement of the valve stem ma...

How to cool the wastewater nitrogen in the water cooling tower of an air separation plant

The steam heater uses overheated steam as the heat source, so it is easy to leak and pollute the heating medium in the process of use. Therefore, the manufacturing requirements are strict and the cost of the equipment is relatively high; steam is used for heating, its price is cheaper than electricity, but it needs antifreezing in winter. From the perspective of operation, electric heating will not affect the regeneration of the adsorber due to steam leakage, so the cost of the equipment is relatively low. Whether steam or electric heating is used for the heating and regeneration of the molecular sieve purifier is related to the equipment capacity and factory conditions. Generally, if the equipment capacity is relatively large and the factory has sufficient steam source, steam heating is usually adopted; if the equipment capacity is relatively small and the factory has difficulty in steam source, electric heating is adopted. Some also adopt steam heating first and then electric heat...

After the gas expands through the guide valve and the impeller, the airflow at the outlet of the impeller still has a certain speed. This part of kinetic energy is not converted into mechanical energy for external work, and the resulting kinetic energy loss is called residual speed loss. Considering the rationality of impeller structure shape, the speed should be at 45 ~ 70 m/s. If a section of short tube with gradually expanding section is connected to the outlet of the impeller, then the flow velocity can be reduced and the kinetic energy can be reduced. A part of kinetic energy of the airflow can be converted into pressure energy, and the pressure at the outlet of the short tube will be increased. Therefore, this short tube is called the diffuser. In the air separation plant, the airflow velocity at the outlet of the diffuser is generally 5 ~ 10 m/s. After the diffuser, the temperature of the gas also rises. For the expansion machine used by the air separation unit, it is the p...

Why does the temperature of liquid oxygen in a condensing evaporator become lower than the temperature of gas nitrogen before it absorbs heat and evaporates

Relationship between the average temperature of liquid oxygen in an air separation plant and the main cooling liquid level

Which factors are related to the throttling effect refrigeration capacity of air separation equipment

1) cleaning method welding slag, rust, slag and so on in the pipeline will be blocked or stuck in the throttle, guiding position and the balance hole of the lower valve cover, which will cause the valve core curved surface, the guiding surface to be pulled and scratched, and the sealing surface to produce indentation and so on.. This often happens when the new system is put into operation and the initial stage after overhaul. This is the most common fault. In this case, it must be removed for cleaning, and the slag should be removed. If the sealing surface is damaged, it should also be grinded; at the same time, the underplug should be opened to wash away the slag falling from the balance hole into the lower valve cover, and wash the pipeline. Before being put into operation, let the regulating valve be fully open and the medium flow for a period of time before being brought into normal operation. 2) external scour method when using common valve to adjust some medium which is easy t...

The method of maintaining air compressor of air separation plant: I. Regular maintenance and maintenance of main components: In order to make the air compressor run normally and reliably and guarantee the service life of the unit, detailed maintenance plan should be formulated, and personnel operation, regular maintenance and regular inspection and maintenance should be carried out, keep the air compressor unit clean, oil-free and dirt-free. The maintenance of main components is conducted according to the following table: Note: A. it must be confirmed when repairing and changing parts according to the above table: the pressure in the air compressor system has been released, separated from other pressure sources, and the switch on the main circuit has been cut off, and the safety sign of not closing has been made. B. The replacement time of the compressor cooling lubricating oil depends on the use environment, humidity, dust and whether there is acid-alkaline gas in the air. New oil ...