Air separation parts FAQ

There are many factors that affect the air displacement of centrifugal compressor. Except for the connection with design, manufacture and installation, the main factors that can affect the air displacement during the operation of compressor are: 1) the air filter is blocked or the resistance increases, cause the pressure of the compressor to reduce. When the outlet pressure remains unchanged, make the compressor pressure ratio increase. According to the performance curve of the compressor, when the pressure ratio increases, the exhaust volume will decrease; 2) the pipeline of the air separation plant is blocked, the resistance increases or the valve breaks down, which causes the exhaust pressure of the air compressor to increase. Under the condition of constant suction pressure, the pressure ratio increases, resulting in the reduction of exhaust volume; 3) the blocking or resistance of compressor intermediate cooler increases, resulting in the reduction of exhaust volume. However, t...

Vacuum pump is a device that produces, improves and maintains vacuum in a certain enclosed space by various methods. Vacuum pump can be defined as a device or equipment that uses mechanical, physical, chemical or physical chemical methods to pump the container to obtain vacuum. With the development of vacuum application, there have been many kinds of vacuum pumps, whose pumping speed has increased from a few liters per second to a few 100,000 liters per second, millions of liters per second. According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas transmission pump and gas capture pump. As the requirements of vacuum application technology in the field of production and scientific research for its application pressure range become wider and wider, most of them need to be made up of several kinds of vacuum pumps. The vacuum pumping system can only meet the requirements of the process of production and scientific research after ...

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