CN-224224898-U - Liquid hydrogen system

Abstract

The present utility model provides a liquid hydrogen system capable of further improving energy efficiency. The liquid hydrogen system (10) is characterized by comprising a hydrogen tank (12) for storing liquid hydrogen in a vehicle, a supply line (20) for converting the liquid hydrogen after being taken out from the hydrogen tank (12) into hydrogen gas and supplying the hydrogen gas to a hydrogen engine (100), an evaporation flow path (40) for guiding the evaporation gas in the hydrogen tank (12) to the outside of the tank, and a fuel cell (50) provided in the evaporation flow path (40) and generating power by the evaporation gas and air.

Inventors

• YAMAMOTO RYOSUKE
• MIZUNO NOBUKAZU
• Mizumi takuro
• Guang Laixinzhi
• Mei Benha

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20250519

Priority Date

20240521

Claims (1)

1. 1. A liquid hydrogen system comprising: A hydrogen tank for storing liquid hydrogen in a vehicle; A supply line for converting the liquid hydrogen after being taken out of the hydrogen tank into hydrogen gas and supplying the hydrogen gas to a hydrogen engine; an evaporation flow path that guides the evaporation gas in the hydrogen tank to the outside of the tank; And a fuel cell that is provided in the evaporation flow path and that generates electricity by evaporating the gas and the air.

Description

Liquid hydrogen system Technical Field Disclosed herein is a liquid hydrogen system for storing liquid hydrogen in a vehicle on which a hydrogen engine is mounted. Background In recent years, a vehicle mounted with a hydrogen engine has been proposed. Such a vehicle is required to carry a large amount of hydrogen. Accordingly, a solution has been proposed in which hydrogen is stored in a liquid state in a vehicle. For example, patent document 1 discloses a liquid hydrogen system having a hydrogen tank for storing liquid hydrogen. The liquid hydrogen system of patent document 1 further includes a first flow path that communicates the hydrogen tank with the outside of the vehicle, and a safety valve provided in the first flow path. With such a configuration, the evaporated gas naturally evaporated in the hydrogen tank is released to the outside of the vehicle, and thus the pressure of the hydrogen tank can be prevented from excessively increasing. Patent document 1 Japanese patent application laid-open No. 2024-006562 Disclosure of utility model Problems to be solved by the utility model However, in patent document 1, the evaporated gas is discharged to the outside of the vehicle directly or after reacting with air, and the evaporated gas is not effectively utilized. Accordingly, in the technology of patent document 1, there is room for improvement in terms of energy efficiency. Accordingly, the present specification discloses a liquid hydrogen system capable of further improving energy efficiency. Means for solving the problems The liquid hydrogen system disclosed in the present specification is characterized by comprising a hydrogen tank for storing liquid hydrogen in a vehicle, a supply line for converting the liquid hydrogen from the hydrogen tank into hydrogen gas and supplying the hydrogen gas to a hydrogen engine, an evaporation flow path for guiding an evaporation gas in the hydrogen tank to the outside of the tank, and a fuel cell provided in the evaporation flow path and generating electric power by the evaporation gas and air. Effects of the utility model According to the liquid hydrogen system disclosed in the present specification, since the boil-off gas is used for power generation in the fuel cell, the energy efficiency can be further improved. Drawings Fig. 1 is a diagram showing a part of the structure of a liquid hydrogen system. Fig. 2 is a diagram showing another partial structure of the liquid hydrogen system. Detailed Description The structure of the liquid hydrogen system 10 will be described below with reference to the drawings. Fig. 1 and 2 are schematic diagrams showing the structure of a liquid hydrogen system 10. The liquid hydrogen system 10 is mounted on a vehicle, and stores hydrogen in a liquid state. The vehicle is a hydrogen engine automobile having the hydrogen engine 100 mounted thereon. The liquid hydrogen system 10 has a hydrogen tank 12 that stores liquid hydrogen. The hydrogen tank 12 stores liquid hydrogen in a thermally insulated manner. As such a hydrogen tank 12, for example, a vessel having a double pipe structure in which a vacuum heat insulating layer is provided between an inner tank made of SUS and an outer tank covering the inner tank is used. Further, in order to uniformly maintain the pressure applied to the inner wall, the hydrogen tank 12 is spherical or oblong as shown in fig. 1. In the hydrogen tank 12, the liquid hydrogen is kept at a low temperature. In the hydrogen tank 12, the pressure of the liquid hydrogen is substantially the same as or slightly higher than the atmospheric pressure, for example, 1Mpa or less. A hydrogen pump 16 is installed in the hydrogen tank 12. The hydrogen pump 16 draws in liquid hydrogen in the hydrogen tank 12 and sends the liquid hydrogen to the hydrogen engine 100. In this example, the hydrogen pump 16 is a booster pump that pumps up liquid hydrogen while pressurizing the liquid hydrogen. The hydrogen pump 16 is driven by a pump motor 18. As shown in fig. 1, the pump motor 18 is disposed outside the hydrogen tank 12. The liquid hydrogen discharged from the hydrogen pump 16 is supplied to the hydrogen engine 100 through a supply line 20 shown in fig. 2. The supply line 20 includes a supply flow path 22, a vaporizer 24, a pressure chamber 26, and a supply pressure reducing valve 28. The supply flow path 22 is a flow path for guiding the hydrogen discharged from the hydrogen pump 16 to the hydrogen engine 100. The vaporizer 24 is a heat exchanger that converts liquid hydrogen into hydrogen gas by exchanging heat between the liquid hydrogen and a refrigerant. The pressure chamber 26 is disposed on the downstream side of the gasifier 24. The pressure chamber 26 is a container that temporarily stores the hydrogen gas output from the vaporizer 24. The capacity of the pressure chamber 26 is a capacity that can cover the extent of response delay of the supply control of hydrogen gas. By providing such a pressure chamber 26, it is