A liquid hydrogen subcooling acquisition device

Abstract

A liquid hydrogen subcooling acquisition device, comprising a compressor, the outlet of the compressor is connected to the inlet of the precooling heat exchanger connected in the precooling system, the outlet of the precooling heat exchanger is connected to the inlet of the throttling device, The outlet of the throttling device is connected to the inlet of the bubbling device. The bubbling device is located in the liquid hydrogen of the subcooler. The gas hydrogen outlet of the subcooler is connected to the inlet of the separation device. The hydrogen gas outlet of the separation device is used for hydrogen recovery. The separation device The outlet of the helium gas is connected with the outlet of the fourth valve and the inlet of the fifth valve, the inlet of the fourth valve communicates with helium, and the outlet of the fifth valve is connected with the inlet of the compressor. The present invention combines bubbling refrigeration and adiabatic throttling The refrigeration process is combined together, and the hydrogen recovery system is considered, so that the cost of obtaining the subcooling degree of liquid hydrogen is greatly reduced, the supercooling time is reduced, the boiling degree of the main liquid hydrogen is weakened, the vibration of the subcooler is reduced, and the temperature field of the liquid hydrogen is reduced. more evenly distributed.

Description

technical field [0001] The invention relates to the technical field of low-temperature propellant supercooling, in particular to a liquid hydrogen supercooling acquisition device. Background technique [0002] Cryogenic propellants (such as liquid hydrogen, liquid oxygen, liquid methane, etc.) have become the most widely used group of propellants for large launch vehicles due to their advantages of non-toxicity, pollution-free, low cost, high specific impulse, and high thrust. The specific impulse is 30% to 40% higher than that of normal temperature propellants. At present, most of the thermodynamic states of low-temperature propellants are around the boiling point, and their thermophysical properties are obviously insufficient, especially for liquid hydrogen. The outstanding disadvantages are: low density and sensible cooling per unit volume. In order to improve the thermodynamic performance of the low-temperature propellant, supercooling is used to improve the deficiency ...

AI Technical Summary

Problems solved by technology

At present, most of the thermodynamic states of low-temperature propellants are near the boiling point, and their thermophysical properties are obviously insufficient, especially for liquid hydrogen. The outstanding disadvantages are: low density and sensible cooling capacity per unit volume

When the pumping speed of the vacuum pump is increased, it will bring two fatal consequences to the system: ① It will cause the storage tank to vibrate violently. Due to the increase of the pumping speed, the pressure of the air pillow in the storage tank will decrease rapidly, and the gas-liquid interface in the storage tank will occur. Violent boiling, like water boiling in an electric kettle, causes strong vibrations in large storage tanks, which can cause loose screws and parts to fall, or cause resonance, weld cracks, and low-temperature propellant leakage; ② cause low-temperature propellant The temperature is seriously stratified, especially near the triple point. Due to the fast pumping speed, the liquid at the gas-liquid interface in the storage tank will freeze, and the liquid at the bottom is actually not supercooled.

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