System and method for producing hydrogen

Abstract

Provided is a system and a method which allow hydrogen to be produced both efficiently and in a stable manner when using exhaust gas produced by power generation as a heat source for the dehydrogenation reaction, controlling the temperature of the dehydrogenation reaction within an appropriate range. The system () for producing hydrogen comprises a dehydrogenation reaction unit () for producing hydrogen from an organic hydride by a dehydrogenation reaction in presence of a dehydrogenation catalyst; a first power generation unit () for generating electric power from energy of combustion gas produced by combustion of fuel; a waste heat recovery unit () for receiving heat from exhaust gas expelled from the first power generation unit; a heat exchanger () provided in the waste heat recovery unit for exchanging heat between the exhaust gas and a heat medium; and a circulation line (L-L) for introducing the heat medium heated in the heat exchanger to the dehydrogenation reaction unit in liquid form, and returning the heat medium expelled from the dehydrogenation reaction unit to the heat exchanger; wherein the heat medium is introduced into the dehydrogenation reaction unit at an introduction temperature ranging between 352° C. and 392° C., the heat medium is expelled from the dehydrogenation reaction unit at an expulsion temperature ranging between 337 ° C. and 367 ° C., and a difference between the introduction temperature and the expulsion temperature ranges between 10° C. and 50° C.