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Classification Of Air Separation Equipment
Apr 13, 2018

Air separation equipment is a complete set of machinery and equipment, often classified by air pressure. There are three kinds of high pressure, medium pressure and low pressure.

The type, capacity and purity of the product should be considered when selecting the equipment type, as well as the power consumption, safe continuous operation cycle and other factors.

Low voltage equipment is widely adopted due to low power consumption, long running cycle and high economic benefit.

Low pressure air separation equipment. The whole equipment consists of air compression system, impurity purification and heat exchange system, refrigeration system and liquid distillation. The corresponding mechanical equipment includes air turbine compressor, air cooling tower, turbine expander and fractionator. Working principle of low pressure air separation equipment based on the liquefaction cycle and distillation theory into the air by the air filter first, then by the turbine compressor cooling compressed air and cooling to the pressure of 0.5 million mpa, temperature is about 303 k, the switch into the heat exchanger (E1 and E2), two heat exchangers can clean water and carbon dioxide in the air, and heat exchange, the air cooled to near the liquefaction temperature (101 k) into the tower, from the tower of spare part to air heat exchanger (E2) heating. The heated air meets a small amount of cold air from the lower tower and enters an adiabatic expansion of the turbine, producing the desired cooling amount and then being sent to the tower rectification. The remaining air is initially rectified in the tower. At the bottom, the liquefied air containing 38% oxygen is obtained. At the top of the tower, pure liquid nitrogen containing 99.99% nitrogen is obtained. Air liquide, pure nitrogen, pollution liquid nitrogen respectively from the tower out through the throttle valve and pressure relief to about 0.05 million mpa, backflow into the tower, the second deep cryogenic distillation in the field, and on the bottom to get 99.6 ~ 99.8% oxygen of high purity oxygen, through the heat exchanger (E4, E2, E1) heat exchange with the air, heating up to the outside air temperature at the back of the tower. High purity nitrogen containing 99.999% of nitrogen was obtained at the top part of the tower, and the nitrogen containing about 96% of the nitrogen in the upper tower was obtained by heat exchanger (E3, E4, E2, E1) to the back of the atmospheric temperature. Between upper and lower tower condenser evaporator is also a kind of heat exchanger, the function of it is through the heat exchange, will be on the bottom of the liquid oxygen evaporation, and the tower under nitrogen gas condensation, therefore calls the cooling evaporator. The liquid oxygen evaporates in part as the output of the product, and the rest is the rising steam required for the distillation of the upper tower. The lower tower condenses the liquid nitrogen, part of which is sent to the upper tower for the reflux solution, and the other part as the reflux required for the lower tower rectification. Therefore, the condensing evaporator is one of the indispensable equipment for the distillation of the upper and lower towers. In addition to the main equipment mentioned above, there is also an adsorber in the cooler, which can absorb the impurity carbon dioxide and explosive substance in the heat exchanger (E1 and E2). The tank also has a liquid oxygen pump to circulate liquid oxygen and clear the explosive material to ensure the safe operation of the equipment. Heat exchangers, towers, liquid oxygen pumps, and turboexpanders, which work at low temperatures, are packed in cold boxes filled with insulated materials to reduce cold loss. Product oxygen and nitrogen from the cold box, then sent to the storage system and the turbine compressor to be pressurized to the required pressure for the user to use.


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