A liquefier device for producing liquid oxygen and liquid nitrogen comprising:
- a plurality of multi pass counter-current flow heat exchangers including a warmer, a pre-heater, a condenser, and an added cooler;
- a plurality of shell and tube heat exchangers including;
- a boiler, an oxygen production flash pot, a nitrogen production flash pot, a load control flash pot, and a pump flash pot, wherein a shell side of each of the shell and tube heat exchangers holds a nitrogen bath;
- a turbine assembly including a plurality of turbine expanders connected in parallel and exiting to a common header, and a plurality of turbine boosters connected in series, each of the turbine boosters having an associated aftercooler;
- the warmer, pre-heater, boiler, and condenser configured to receive and cool an oxygen gas flow supplied from an oxygen gas inlet line and directing the cooled oxygen gas flow into a tube side of the oxygen production flash pot to produce subcooled liquid oxygen;
- a first of the turbine boosters connected in series configured to receive a flow of gas nitrogen to be increased in pressure and supplied from a low pressure nitrogen gas inlet line and another line containing nitrogen gas exiting the shell side of one or more of the oxygen production flash pot, nitrogen production flash pot, load control flash pot, and pump flash pot after being increased in temperature in the multi-pass counter current flow heat exchangers;
- the multi-pass counter-current flow heat exchangers and boiler also configured to cool a combined flow of gas nitrogen supplied from a high pressure nitrogen gas inlet line and a return flow of equal pressure gas nitrogen in a line connecting from an exit of a second to last of the turbine booster aftercoolers, the combined flow of gas nitrogen then being fed into a tube side of the nitrogen production flash pot to produce subcooled liquid nitrogen;
- the multi-pass counter current flow heat exchangers and boiler also configured to cool a nitrogen gas flow in a line exiting the aftercooler associated with last turbine booster connected in series and then feed the cooled nitrogen gas flow into a tube side of the pump flash pot to produce subcooled liquid nitrogen, at least some of which is then brought up in pressure and directed into the shell side of the boiler at an inlet temperature of within ±5° F. of a boiler running temperature and is boiled to a vapor pressure point, and then is directed into the pre-heater to produce a nitrogen gas stream having a temperature and a pressure to run the turbine expanders;
- a pressure drop pipeline containing a nitrogen exit flow from the turbine expanders having an exit temperature close to a liquid phase connecting to an inlet to a phase separator in which nitrogen gas and liquid nitrogen droplets in the nitrogen exit flow are separated, and a flow of gas nitrogen off of the phase separator is directed in either a first branch line connecting sequentially through the condenser, boiler, pre heater, and warmer and then connecting to the turbine boosters connected in series between an exit of the second to last turbine booster aftercooler and inlet to the last turbine booster, or in a second branch line connecting to a tube side of the load control flash pot to produce subcooled liquid nitrogen;
- and
- another exit line from the phase separator connected to direct separated liquid nitrogen through the added cooler to the shell side of the pump flash pot, or into another line including an overflow valve and connecting to the second branch line from the phase separator.