Small air separation FAQ

How can I check that the cooling water circulation of my air separation plant is fully connected?

Minimum temperature in air separation column

What measures to take when the precooling system fails

Screw compressor bearing burnt out

During the start-up phase, when the liquid volume accumulates in the condensing evaporator, the gas and liquid mixture will pass through the liquid air and liquid nitrogen throttle valves. When the throttle valve begins to close, due to the large opening of the valve, when the amount of gas and liquid mixture from the lower column to the upper column changes little, and the pressure of the lower column does not increase significantly, it means that the temperature difference of the condensing evaporator has not increased. At this time, the condensing evaporator and the surrounding insulation have been cooled to the low temperature required by the liquid accumulation stage. Due to a large amount of cold production and a large amount of gas liquefaction, the liquid evaporation in the condensing evaporator is also increased. The rising steam produced prevents the flow of liquid from the sieve plate hole, and gradually accumulates liquid on the tray, so the liquid level will drop. In ad

From the starting characteristics of the motor driving the air compressor, it can be seen that the current of the motor starting is several times larger than that of normal operation. The strong starting current has a great influence on the motor itself, transformer and transmission line. In order to reduce the starting time and starting current, no-load is a more effective measure. Based on this requirement of motor starting, before starting the air compressor, the pressure of all levels of pressure gauges should be checked. If there is air, the air should be released.

The quality of air separation plant installation is an important part to ensure the overall quality of air separation plant, so the safety of air separation plant installation is very important. The safety precautions in the installation of air separation plant are summarized as follows. 1. The installation and construction of air separation plant must be carried out in strict accordance with the “Safety Technical Operation Regulations” of the construction unit. 2. The construction personnel of air separation plant must work with certificate, and safety belt must be fastened during climbing operation to ensure safety protection of high-altitude operation. 3. The hot work in the air separation plant area must go through the fire operation procedures, and the fire can be started only after the procedures are complete, and there must be a special person to take care of the hot work process. 4. During the pipeline strength pressure test of air separation plant, other operations

The skid mounting of equipment refers to connecting the pipelines, equipment, pumps, control cabinets, electrical instruments and other components of the complete set into a whole according to the designed process flow, and fixing them on an integral base through welding, bolting and other connection methods. Without site installation, it can be directly completed the mechanical and electrical integration installation of the whole set in the plant area, then transporting and hoisting will be convenient.

The air contains 0.932% of argon. When the upper tower wants to produce 99.6% of oxygen, it must contain 1.05% of argon in the nitrogen exhaust. From the perspective of the separation process, the stripping section (below the liquid-air inlet) in the upper column is basically an oxygen-argon separation, and the rectification section (above the liquid-air inlet) is basically a nitrogen-oxygen (argon) separation. . The boiling points of argon and oxygen are relatively close (the boiling point of o...

What is the principle of the deep cooling method of air separation?

Internal compression air separation process is a process form in which liquid products are pressurized by liquid pump in the cold box, and then sent out of the cold box after reheating by high-pressure heat exchanger. The working pressure of internal compression process generally exceeds the critical point of oxygen and nitrogen. Heat transfer of liquid in supercritical state is a major feature of internal compression process. In the distillation process, due to the difference of product types and acquisition methods, there is a big difference between the material import and export of internal equipment and external compression process. In the internal compressed air separation process, the pressure of oxygen is not limited, the maximum output of nitrogen can reach 2.8 times of that of oxygen, and the extraction rate of argon can reach about 85%. The internal compression air separation process is generally composed of internal compression system, air precooling system, molecular sie

When the cryogenic method is used for air separation, the whole process is carried out in closed containers and pipelines from the air compressor to the final gas and liquid products such as oxygen, nitrogen, argon and so on. During the start-up, shutdown and normal operation of the equipment, the values of relevant parameters must be strictly controlled in each process, including pressure, temperature, flow, resistance, liquid level, rotate speed, voltage, current, component analysis, etc. The following introduces some instrument control components for measuring temperature, pressure and flow for reference. 1.Temperature measurement: In the temperature measurement of air separation plant, the main measuring elements are platinum thermistor thermometer, temperature transmitter and bimetal thermometer. Platinum thermistor thermometer is widely used in air separation plant due to its high measurement accuracy at low temperature (13.81K) and no temperature compensation at cold end.