OFF-GAS COMBUSTOR AND FUEL CELL SYSTEM

To provide an off-gas combustor and a fuel cell system, capable of increasing a temperature of a reformer while suppressing a heat loss.SOLUTION: An off-gas combustor 60 makes an off-air and an off-fuel as an off gas exhausted from a fuel cell 10. An off-gas combustor 60 comprises: a fuel part 63 that mixes and fuels the off-air and the off-fuel; a temperature rising part 64 that rises a temperature of a reformer 34 by using heat generated in the fuel part 63; and an off-air flow channel 61 in which the off-air exhausted from the fuel cell 10 flows. The off-air flow channel 61 contains: a primary air flow channel 611 in which one part of the off-air flows as a primary air to the fuel part 63; and a secondary air flow channel 612 in which the other air excluding the primary air in the off-air flows as a secondary air so as to bypass the fuel part 63.SELECTED DRAWING: Figure 1 【課題】熱損失を抑制しつつ、改質器を昇温させることが可能なオフガス燃焼器および燃料電池システムを提供する。【解決手段】オフガス燃焼器６０は、燃料電池１０から排出されるオフガスであるオフ空気およびオフ燃料を燃焼させる。オフガス燃焼器６０は、オフ空気およびオフ燃料を混合して燃焼させる燃焼部６３と、改質器３４を燃焼部６３で生ずる熱を利用して昇温させる昇温部６４と、燃料電池１０から排出されるオフ空気が流れるオフ空気流路６１と、を備える。オフ空気流路６１は、オフ空気の一部を一次空気として燃焼部６３に流す一次空気流路６１１と、オフ空気における一次空気を除く他の空気を二次空気として燃焼部６３を迂回して流す二次空気流路６１２と、を含んでいる。【選択図】図１