Heat exchanger and hydrogen production apparatus

Abstract

[Problem] To provide a heat exchanger that maintains sealing performance regardless of thermal expansion and contraction. [Technical Content] The heat exchanger includes: an outer passage dividing member, an inner passage dividing member, and a partition member. The inner passage dividing member forms an inner passage for the flow of a first fluid. The space divided by the inner and outer peripheral surfaces of the outer passage dividing member constitutes the outer passage. The partition member divides the outer passage into a first space and a second space at the end of the inner passage dividing member. A second fluid flows in the first space, and the end of the inner passage dividing member protrudes into the second space. The inner passage includes: a reversing portion that reverses the flow direction of the first fluid, an upstream passage upstream of the reversing portion, and a downstream passage downstream of the reversing portion. The length of either the upstream or downstream passage, i.e., the first passage, is longer than the length of the other passage, i.e., the second passage.

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