HOT BOX DEVICE AND OPERATING METHOD THEREOF

A hot box device and an operating method thereof are provided. The hot box device includes a first shell, a reformer, a burner, and a cathode inlet pipe. The first shell has a first cavity. The reformer is disposed in the first cavity. The burner is disposed in the reformer and has an opening. The cathode inlet pipe is disposed in the first cavity and extends through the first shell. The cathode inlet pipe is in fluid communication with the first cavity, and the opening of the burner is in fluid communication with the first cavity.