FUEL CELL SYSTEM INCLUDING HEAT EXCHANGER USING BURNER OFF-GAS

• Main Authors: Park, Se Lin, Yi, Yong, Kim, Jin Hyung, Son, Seung Kil, Shin, Seock Jae
• Format: Patent
• Language: English
• Published: 16.05.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Disclosed is a fuel cell system in which fuel or air supplied to a burner is preheated using a high-temperature burner off-gas (BOG) discharged from the burner to thus enhancing operation efficiency of the burner. The fuel cell system including a heat exchanger using a BOG includes a hot box formed of a heat insulating material, a fuel cell stack disposed in the hot box and including a cathode, an electrolyte, and an anode, a high-temperature heat exchanger disposed in the hot box, generating a high-temperature anode gas including hydrogen upon receiving a fuel gas, and discharging the anode gas to the anode of the fuel cell stack, a burner disposed in the hot box, generating a high-temperature burner off-gas (BOG) upon receiving a fuel gas and air, and supplying the BOG as a heat source in the fuel cell system, and a recovery heat exchanger disposed in the hot box, installed at a burner air supply line supplying air to the burner from the outside of the hot box, and preheating air supplied to the burner through the burner air supply line using the high-temperature BOG.