Air Liquide 60,000 m3/h oxygen generator AC

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The last edit to this post was made by Jing Changzai on 2016-5-30 at 22:11. The process air coming out of the imported air filter (F01) has its dust and other mechanical impurities removed; it is then compressed to the desired pressure using multi-stage centrifugal compressors (C01). After that, it is cooled with lukewarm water, and further cooled by the cold water in the air cooling tower (E07) before being sent to the adsorber. This low-temperature water is recycled after being cooled in the nitrogen-water tower (E60). The air exiting the air-cooling tower (E07) passes through an adsorption system composed of two purifiers (R01) and (R02) filled with alumina and molecular sieve, which adsorbs water, carbon dioxide, and hydrocarbons. These two purifiers operate alternately: while one is in use, the other is regenerated with contaminated nitrogen from the cryogenic tank. During the heating and regeneration phase of the adsorbent, in conventional regeneration, the contaminated nitrogen gas is heated in a regeneration heater (E08) before being sent to the purifier ； If necessary, special regeneration can be carried out by heating using electric heaters (E09) in series. The electric heater (E09) can also be used in combination with E08 to complement each other ； Or use them separately to serve as a backup for each other. 1.3 Process description and product purification: The clean air is divided into three streams; the main stream enters the cold box directly, where it undergoes convective heat exchange with the gaseous product in the main heat exchanger (E01), thereby being cooled to a temperature close to the dew point. This airflow then enters the bottom of the medium-pressure column (K01) for the first separation. The nitrogen content increases when the rising gas comes into contact with the descending liquid. The required reflux liquid comes from the liquid nitrogen condensed by the boiling oxygen in the main condensation evaporator (E02) at the top of the medium-pressure column. The second stream of purified air is sent to the air compressor (C05) for compression, reaching a pressure of 2.6 MPA(A); it is then fed into E01, where it is cooled in the main heat exchanger of the cold box (E01). After expansion through an expansion valve, it returns as a liquid to the medium-pressure column (K01) and the low-pressure column (K02). This high-pressure air is used to gasify medium-pressure liquid oxygen and liquid nitrogen. The third stream of purified air is fed into the booster expander (ET01C/ET01 or ET02C/ET02) for compression, reaching a pressure of 1.07 MPA(A); it is then sent to E01, where it is cooled in the main heat exchanger (E01). After expansion by the expander, it is sent back to E01 for further subcooling, and finally delivered to the low-pressure tower (K02). Its main function is to provide cooling capacity and maintain the stable operation of the device. From top to bottom, the medium-pressure tower (K01) produces the following products: – Medium-pressure liquid nitrogen – Pure nitrogen reflux liquid – Contaminated liquid nitrogen reflux liquid – Oxygen-enriched liquid air. The medium-pressure liquid nitrogen is pressurized to 1.117 Mpa (A) by the liquid nitrogen pumps (P05A/B), after which it is sent to the main heat exchanger for reheating before being fed into the pipeline network. After being subcooled in the subcooler (E03), the pure nitrogen reflux liquid, the contaminated nitrogen reflux liquid, the oxygen-enriched liquid air, and liquid air are sent to the low-pressure column (K02) and the pure nitrogen column (K03). The low-pressure column (K02) produces the following products: – liquid oxygen at the bottom, – contaminated nitrogen at the top, – an argon-rich fraction in the middle. Liquid oxygen is extracted from the bottom of the low-pressure column (K02). Most of it enters the main heat exchanger (E01) after being pressurized by the medium-pressure liquid oxygen pumps (P03A/B), where it is vaporized and reheated to atmospheric temperature before being sent to the medium-pressure oxygen pipeline network. It is then pressurized to the required pressure using an oxygen compressor and sent into the pipeline network. A small portion is sent to the storage tank as liquid oxygen product. When the backup system is activated, the liquid oxygen in the storage tank is pressurized by the liquid oxygen pump and evaporator in the backup system, and then sent to the pipeline network. To extract argon, the argon fraction drawn from the middle of the low-pressure column (K02) is sent to the crude argon column (K10), where the oxygen content is removed. The reflux liquid of this tower is generated by the evaporation of the oxygen-enriched liquid air in the crude argon column condenser (E10). Then the crude liquid argon flows into the refined argon tower (K11) to separate and remove nitrogen components, while the resulting liquid argon product is sent to a storage tank. The heat of vaporization at the bottom of the pure argon column (K11) is generated by an evaporator in this column (E15), which condenses a small amount of medium-pressure nitrogen coming from the medium-pressure column. The condensed liquid nitrogen enters the refined argon column condenser (E16), where it neutralizes the contaminated liquid nitrogen; at the same time, it is evaporated to condense the rising vapor, thereby providing a reflux stream to the refined argon column (K11). 1.4 Cooling load requirement: The required cooling capacity is obtained by expanding the low-temperature pressurized air through the turbine expanders (ET01/ET02). The braking of the turbine expander is achieved through a booster (ET01CET/02C). 1.5 Operating the turbine expander