Liquid hydrogen container overfill prevention control device

Abstract

The utility model relates to a kind of liquid hydrogen container anti overfill control device, including tank, the inner cavity of tank is communicated with inlet pipe, inlet pipe is provided with inlet valve, the side outside tank is provided with liquid level meter, from top end into the inner cavity suspends the one end of overflow pipe, temperature transmitter is connected on the pipeline that overflow pipe extends outside tank, overflow valve is set on the upstream of temperature transmitter on overflow pipe, and overflow pipe is connected with diffusion pipe on the downstream of temperature transmitter. When the liquid level in the inner cavity of tank reaches maximum value, liquid hydrogen will flow out from overflow pipe, when the internal temperature detected by temperature transmitter on overflow pipe is-253 ℃, DCS controller controls bottom inlet valve and top inlet valve to close, to prevent overfilling, the end of overflow pipe is connected with diffusion pipe, the residual liquid hydrogen downstream of overflow pipe is discharged through diffusion pipe, the opening of gradually shrinking at the end of diffusion pipe, so that liquid hydrogen is continuously discharged after gasification, reduce hydrogen concentration in air, ensure safety.

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