175、structure and characteristics of large liquid ammonia cryogenic full capacity tank - doer equipment
classification：forum publishtime：2021-06-19 15:20:14
structure and characteristics of large liquid ammonia cryogenic full capacity tank - doer equipment
the large-scale liquid ammonia low-temperature full tank adopts the flat bottom cylinder bimetal full tank structure. the main design standard of the full tank is api620-2018 "design and construction of large welded low-pressure storage tank" and the buyer's document requirements standard; the tank structure adopts the following forms:
it is composed of main vessel, secondary vessel, bottom insulation, interlayer insulation, ceiling insulation, steel structure at the top of storage tank, tower ladder, equipment valve, electrical instrument and foundation platform.
the liquid ammonia is stored in the inner tank (main container) of the full tank, and the outer tank (secondary container) is used to hold the evaporated gas and cold insulation materials. when the inner tank leaks, the outer tank can store part of liquid ammonia effectively. the inner and outer tanks are flat bottomed and cylindrical metal tanks. the top of the inner tank is suspended in the support structure of the outer tank vault by suspenders. the outer tank vault is spherical and the top support structure is ribbed ring grid. the foundation of liquid ammonia storage tank adopts concrete elevated platform structure.
the double metal full tank ceiling structure has the following advantages:
① the structure of full tank ensures that in case of inner tank leakage, part of liquid ammonia liquid can be effectively stored in outer tank, and the evaporated gas can be recovered or sent to flare through recovery pipeline.
② according to the specification, the fire prevention distance of full tank structure is the least and the land utilization rate is high.
③ the inner tank design does not need to consider the internal positive pressure and interlayer vacuum load, so the inner tank will not be affected in case of overpressure or vacuum accident, and the safety is higher.
④ it is not necessary to consider the pipe compensation in the interlayer when connecting the ceiling structure. for the inner tank with dome roof structure, both ends of the pipe are respectively fixed with the inner tank and the outer tank, while for the ceiling tank, only one end of the pipe is fixed on the top of the outer tank, and the other end can be freely retracted.
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