System for preparing deeply subcooled liquid oxygen based on mixing of liquid oxygen and liquid nitrogen and then vacuum-pumping

Patent metadata

Field	Value
Publication number	US-11262124-B2
Application number	US-202117213137-A
Country	US
Kind code	B2
Filing date	Mar 25, 2021
Priority date	Mar 25, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A system for preparing subcooled liquid oxygen based on mixing of liquid oxygen and liquid nitrogen and then vacuum-pumping, including atmospheric-pressure saturated liquid nitrogen and oxygen tanks. An inlet of the liquid nitrogen tank communicates with pressurized gas, and an outlet is connected to an inlet a of a secondary subcooler. An inlet of the liquid oxygen tank communicates with the pressurized gas, and a first outlet is connected to an inlet b of the secondary subcooler. An outlet c of the secondary subcooler is connected to an inlet d of a primary subcooler. An outlet e of the primary subcooler is connected to a pumping-out device through a rewarming device. A second outlet of the liquid oxygen tank is connected to an inlet n of the primary subcooler. An outlet o of the primary subcooler is connected to an inlet r of the secondary subcooler.

First claim

What is claimed is:

1. A system for preparing subcooled liquid oxygen based on mixing of liquid oxygen and liquid nitrogen and then vacuum-pumping, comprising:
an atmospheric-pressure saturated liquid nitrogen tank; and
an atmospheric-pressure saturated liquid oxygen tank;
wherein an inlet of the atmospheric-pressure saturated liquid nitrogen tank is communicated with pressurized gas through a first valve; an outlet of the atmospheric-pressure saturated liquid nitrogen tank is connected to an inlet (a) at a shell side of a secondary subcooler through a second valve; and the atmospheric-pressure saturated liquid nitrogen tank is provided with a first relief valve;
an inlet of the atmospheric-pressure saturated liquid oxygen tank is communicated with the pressurized gas through a third valve; a first outlet of the atmospheric-pressure saturated liquid oxygen storage tank is connected to an inlet (b) at the shell side of the secondary subcooler through a fourth valve; the atmospheric-pressure saturated liquid oxygen tank is provided with a second relief valve; and an outlet (h) at the shell side of the secondary subcooler is connected to an eighth valve;
an outlet (c) at the shell side of the secondary subcooler is connected to an inlet (d) at a gas side of a primary subcooler through a sixth valve; an outlet (e) at the gas side of the primary subcooler is connected to an evacuating device through a tenth valve, a rewarming device and an eleventh valve in sequence; and the secondary subcooler is provided with a third relief valve;
a second outlet of the atmospheric-pressure saturated liquid oxygen tank is connected to an inlet (n) at a liquid side of the primary subcooler through a fifth valve; an outlet (o) at the liquid side of the primary subcooler is connected to an inlet (r) of a tube side of the secondary subcooler through a seventh valve; an outlet (s) of the tube side of the secondary subcooler is connected to an inlet of a subcooled liquid oxygen storage tank through a ninth valve; and the subcooled liquid oxygen storage tank is provided with a fourth relief valve; and
connections are performed using a vacuum multilayer heat-insulated low-temperature fluid pipeline.

2. The system of claim 1 , wherein the rewarming device is an ambient-air heat exchanger.

3. The system of claim 1 , wherein the evacuating device is a vacuum pump or an ejector with a working pressure being less than or equal to 10 kPa.

Assignees

• Univ Xi An Jiaotong

Inventors

• Xie fushou
• Li Yanzhong
• Ren Jianhua
• Mao Hongwei

Classifications

• F25J1/0017 Primary

  Oxygen · CPC title

• F25J3/0423 Primary

  Subcooling of liquid process streams · CPC title

• F17C2225/0169

  subcooled · CPC title

• F25J2245/50

  the recycled stream being oxygen · CPC title

• F17C2227/0309

  using another fluid · CPC title