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Medium and low pressure system – flow direction of the quench medium in the full-circulation aqueous solution method [Last edited by jindin312 on 2009-2-15 17:07]
Dude, are you referring to the medium flow in the medium and low pressure systems, or in the inerting device? If it is a low-pressure system, there will be more materials involved, making it more complex. Therefore, it is recommended to take a look at the relevant process flow diagram: it will be clear at a glance. In the case of an inerting device, it’s relatively simple: the gas phase coming from ammonia cooler A (which consists mostly of gaseous ammonia) enters ammonia cooler B through the explosion-proof space located at the upper part of the inerting device. The purpose of this arrangement is that if the inerting device explodes, the explosion-proof plate will be damaged first; once this plate breaks, the exhaust gas that has been purified by the inerting device (with a very low ammonia content) mixes with the gas phase in the explosion-proof space, thereby increasing the ammonia content in that gas phase significantly. This moves the exhaust gas out of the explosive range, thus serving to prevent explosions. The exhaust gas coming from ammonia cooler C enters the bottom of the washing section at the lower part of the inert gas washer. There, it is washed and absorbed of its ammonia content by dilute ammonia water pumped by the ammonia water pump; after that, it exits from the middle part of the inert gas washer and proceeds to the tail gas absorption tower via PC301 for further washing. The lower washing section of the inert scrubber is equipped with heat exchange tubes (with cooling water flowing inside), which remove the heat generated during the washing and absorption of gaseous ammonia.