HYDROGEN FEED AND RECIRCULATION DEVICE FOR FUEL CELL SYSTEM

摘要

A hydrogen feed and recirculation device for a fuel cell system supplies hydrogen from a hydrogen tank and unreacted recirculated hydrogen discharged from a stack to the stack. The hydrogen feed and recirculation device can supply hydrogen to the stack through a first nozzle when hydrogen supply pressure is low and supply the hydrogen to the stack through a second nozzle using a Coanda Effect other than the first nozzle when the hydrogen supply pressure is high to satisfy a required hydrogen supply amount through an entire operating area of the fuel cell and prevent nozzle vibration and noise generation.

主权项

1. A hydrogen feed and recirculation device for a fuel cell system, the device comprising:
a first hydrogen supply block having a hydrogen supply path through which hydrogen from a hydrogen tank passes; a flow control valve assembled to the first hydrogen supply block to open/close the hydrogen supply path; a second hydrogen supply block provided in a structure having a first hydrogen branch path and a second hydrogen branch path which are in communication with the hydrogen supply path of the first hydrogen supply block and assembled to the first hydrogen supply block; a recirculation hydrogen supply block provided in a structure having a recirculation hydrogen inlet for introducing recirculated hydrogen from a stack and assembled to the second hydrogen supply block; a pilot valve mounted throughout the second hydrogen branch path and the recirculation hydrogen supply block; a first nozzle mounted on the first hydrogen branch path and disposed at the center of the recirculation hydrogen supply block; and a mixing diffusion pipe having a second nozzle inserted into and mounted on a proximal end of the recirculation hydrogen supply block and ejecting the hydrogen from the pilot valve by using a Coanda Effect at a rear part of the mixing diffusion pipe, and a mixing path and a diffusion path supplying the hydrogen ejected from the first nozzle and the second nozzle to the stack at a front end of the mixing diffusion pipe.