Bubbling and spraying combined humidifier and fuel cell humidifying system using same

Abstract

The invention discloses a bubbling and spraying combined humidifier and a fuel cell humidifying system using the same, and relates to the field of fuel cells, and particularly relates to the field ofhumidity control of the fuel cells. The system comprises a membrane humidifier and the bubbling and spraying combined humidifier, and outlet gas can be kept in a saturated state after the gas passes through the combined humidifying system. A stack module cooling system is connected into a humidifier heat exchange jacket, so that the temperature of a humidifier and the operating temperature of a stack module are kept consistent in real time, dry and wet mixed gas is heated to the operating temperature of the stack module through a stack mixed gas inlet heater, and finally the requirement for rapid humidity response is met through a dry and wet gas mixed humidity control method. Meanwhile, cyclic utilization of water produced by the fuel cell is achieved through a condensate water supplementing system, reaction gas is preheated through tail gas of the fuel cell and reaction heat production, comprehensive utilization of system energy is achieved, and efficient and low-energy-consumption operation of the humidifying system is guaranteed.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to the field of humidity control of fuel cells. Background technique [0002] Humidification system is an important auxiliary system that affects the performance and durability of fuel cell systems. In order to improve the proton conductivity of proton exchange membrane fuel cells, the membrane needs to maintain a sufficient hydration level to effectively conduct protons. Low humidity or no humidity operation will accelerate the membrane degradation process, and too much water may hinder the transport of reactants. Appropriate humidity is the key to maintaining good performance of fuel cells. Therefore, the humidity of air and hydrogen should be precisely controlled before entering the fuel cell stack. Designing a suitable humidification system and control strategy is of great significance for the wide application of fuel cells. [0003] So far, the humidification methods used in fuel cel...

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Problems solved by technology

[0016] Aiming at the deficiencies in the existing technology, it solves the problems in the existing technology that the range of humidity that can be achieved is small, the humidity response is slow to the change of the required set point, the humidity response speed is slow, the comprehensive utilization rate of system energy is low, and the energy consumption is large The problem

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