Hydrogen turbine expansion device and method based on gas bearing

Abstract

The invention relates to a hydrogen turbine expansion device and method based on a gas bearing, the device comprises a gas bearing assembly, a sealing assembly and a rotor system, and the rotor system is wrapped in the gas bearing assembly and the sealing assembly; the rotor system comprises a driving wheel, a rotor main shaft and a braking part, the driving wheel and the braking part are arranged at the two ends of the rotor main shaft respectively, and the driving wheel is driven through hydrogen driving gas; the gas bearing assembly is matched with the rotor main shaft, the sealing assembly is arranged at one end, close to the driving wheel, of the rotor main shaft, bearing gas is introduced into the gas bearing assembly, and the bearing gas forms a gas film between the gas bearing assembly and the rotor main shaft under the isolation of the sealing assembly introduced with hydrogen sealing gas; and bearing gas is tolerable gas of the rotor main shaft. Tolerant gas is used for lubricating a rotor system, operation of the hydrogen turbine expansion device is guaranteed, the gas bearing is high in bearing capacity, the problems of hydrogen embrittlement and driving gas pollution can be effectively solved, and the hydrogen liquefaction effect is good.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy application, and in particular relates to a hydrogen turbine expansion device and method based on a gas bearing. Background technique [0002] The hydrogen turbine expansion device is the core key component of the hydrogen liquefaction device. The device uses the speed change of the working medium to convert energy. The working medium expands in the flow-through part of the turboexpander to obtain kinetic energy, and is directed by the expansion wheel. The external output work reduces the internal energy and temperature of the working fluid at the outlet of the expander. Most of the existing liquid hydrogen production plants in operation in China are based on the helium refrigeration cycle. Because the physical properties of helium and hydrogen are very different, there is a large heat exchange loss, and the overall efficiency of the helium refrigeration cycle device is not high. Hydrogen...

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Problems solved by technology

[0007] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a hydrogen turboexpansion device and method based on gas bearings, which uses non-hydrogen gas as the lubrication of the rotor system to ensure the operation of the hydrogen turboexpansion device, and the gas bearing Strong bearing capacity and can effectively avoid hydrogen embrittlement and driving gas pollution, and the effect of hydrogen liquefaction is good

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