178、process flow of large liquid ammonia low temperature full volume tank system (i) - doer equipment
classification：forum publishtime：2021-07-10 14:11:23
process flow of large liquid ammonia low temperature full volume tank system (i)
process overview of large liquid ammonia low-temperature full volume tank system is that the liquid ammonia sent by the liquid ammonia unloading platform is sent to the liquid ammonia full volume tank for storage through the low-temperature cold insulation pipe. the liquid ammonia is output by the liquid ammonia submerged pump, the flash steam (bog) generated by the liquid ammonia storage tank is recovered by the bog system, and the gas behind the safety valve enters the flare through the safety release gas (eag) system.
liquid inlet and purging system
the liquid inlet system is that the liquid ammonia sent by the liquid ammonia liquefaction device or unloading platform is sent to the liquid ammonia storage tank for storage through the low-temperature process pipeline. the liquid can be fed through the top liquid inlet pipeline or the bottom liquid inlet pipeline. both the top liquid inlet pipeline and the bottom liquid inlet pipeline need to be equipped with a remote-controlled emergency shut-off valve.
the purging system is that the normal temperature and low pressure nitrogen sent from the process unit area enters the main container through the purging ring pipeline set in the main container, enters the insulation layer at the bottom of the storage tank through the nitrogen purging pipeline of the bottom insulation layer, and enters the pump well of the submersible pump through the purging pipeline of the submersible pump, so as to ensure the air replacement at all corners of the storage tank and the drying of internal thermal insulation materials, in addition, a nitrogen purging exhaust pipeline is set at the top of the secondary vessel, a purging exhaust pipe is set at the bottom insulation layer, and an annular exhaust pipe is set in the interlayer space for the discharge of replacement air during purging.
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next： 179、process flow of large liquid ammonia low temperature full capacity tank system (part 2) - doer equipment
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