Hydrogen fuel cell tail gas recovery treatment system and method

Abstract

The invention discloses a hydrogen fuel cell tail gas recovery treatment system and method. Heat exchangers are arranged at outlets of a liquid hydrogen tank and a liquid oxygen tank, the rear end of a hydrogen pipeline and the rear end of an oxygen pipeline, and the heat exchangers can be cooled through the low-temperature characteristics of liquid hydrogen vaporization and liquid oxygen vaporization. A second fuel cell stack is additionally arranged at the rear end of a first fuel cell stack, so that the surplus of hydrogen and air in the hydrogen pipeline and an air pipeline can be effectively reduced, and part of electric energy can be generated and used by a low-power load. According to the invention, power can be generated again through the second fuel cell stack, and residual fuel can be classified, recycled and stored through the first to third heat exchangers and can be reused, so that the fuel utilization rate is effectively improved; and the whole set of system does not discharge any liquid or gas to the external environment during operation, is environment-friendly, and completely meets the use conditions of vehicles such as vacuum tunnel trains and submarines.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a hydrogen fuel cell tail gas recovery and treatment system and method. Background technique [0002] With the country's vigorous promotion of new energy sources, fuel cells are gradually being applied in various fields. In a common application environment, the residual exhaust gas and moisture generated by the fuel cell power generation can be directly discharged into the air. However, considering the application of fuel cells in submarines and the application of fuel cell trains in vacuum pipelines, the residual exhaust gas and moisture generated during power generation cannot be directly discharged into water or air, so special treatment is required for the residual gas of fuel cells. [0003] For residual gas recovery technology, such as patent CN205319241U, a hydrogen recovery system with multiple sets of fuel cells is proposed, which can reuse residual hydro...

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Problems solved by technology

[0003] For the residual gas recovery technology, such as the patent CN205319241U, a hydrogen recovery system with multiple sets of fuel cells is proposed, which can reuse the residual hydrogen through a hydrogen pump and a buffer container, but it cannot ensure that hydrogen and oxygen, water vapor, etc. The complete separation of the fuel cell leads to the mixing of impurities such as oxygen on the anode side of the fuel cell

Another example is the patent CN208487415U, which proposes a device with hydrogen filling, hydrogen release, and hydrogen recovery, which introduces hydrogen into the hydrogen recovery device through a bypass valve, and stores hydrogen by adsorption, but it does not consider hydrogen in hydrogen. The influence of impurities such as oxygen and water vapor on the hydrogen storage system, and some residual gas will still be discharged after hydrogen storage

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