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86 512-81666096179、process flow of large liquid ammonia low temperature full capacity tank system (part 2) - doer equipment
classification：forum publishtime：2021-07-17 16:18:36
process flow of large liquid ammonia low temperature full capacity tank system (part 2)
discharge of large liquid ammonia low-temperature full volume tank and outlet of storage tank of reflux system (gasification or loading): the discharge pipe of storage tank is equipped with remote low-temperature shut-off valve and root stop valve
bog recovery system: when the gas phase pressure in the storage tank rises to 10-13kpa (which can be adjusted according to the process package), the low-temperature automatic regulating valve opens and the gas is discharged into the bog heater or low-pressure flare to balance the pressure in the storage tank; when the gas phase pressure in the tank drops to 10kpa (which can be adjusted according to the process package), the low-temperature regulating valve is closed to maintain the pressure of the tank within the safe range.
gas replenishment system: if the gas phase pressure in the storage tank drops to 2kpa, the low-temperature automatic regulating valve on the gas replenishment pipeline will open. when the storage tank pressure rises to 5kpa, stop gas replenishment (fine adjustment can be made according to the liquefaction process package) to keep the storage tank pressure within a safe pressure range.
eag to flare: when the gas phase pressure in the storage tank is higher than 14kpa, the regulating valve to flare is opened, and the gas in the storage tank is discharged into the low-pressure flare system to ensure the safety of the storage tank.
the pressure and vacuum relief valve is an integral part of the tank. two sets of safety vent pipelines are set on the top of the storage tank, and two sets of storage tank pressure relief valves are equipped, one for use and one for standby. there is always one set of pressure relief valve in operation. when the gas phase pressure of the storage tank reaches 17kpa, the pressure relief valve will be opened to vent and depressurize.
three sets of vacuum suction valves are set on the top of the storage tank, one for dual use and one for standby. there are always two sets of suction valves working. when the gas phase pressure of the storage tank reaches -0.22kpa, the suction valve opens to increase the gas phase pressure in the storage tank.
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