Hydrogen generating apparatus and fuel cell system

Abstract

A hydrogen generating apparatus comprising combustion gas duct (5) for flow of combustion gas from a combustor; preheater evaporator (6) adapted to be fed with raw gas and water and to evaporate the water and heat the raw gas by heat transferred via partition walls from carbon monoxide cutdown unit (10) and the combustion gas duct; reformer (7) adapted to produce a reformate gas from the raw gas and steam fed from the preheater evaporator with the use of reforming catalyst (8) and heat transferred via partition wall from the combustion gas duct; carbon monoxide cutdown unit (10) adapted to remove any carbon monoxide contained in the reformate gas fed from the reformer with the use of carbon monoxide removing catalyst (9); and tubular body (3) having its both ends closed wherein, dividing the interior space thereof by partition walls (1),(2)(30),(47), the combustion gas duct, preheater evaporator, reformer and carbon monoxide cutdown unit are provided thereinside. Between the preheater evaporator and the carbon monoxide cutdown unit, there is provided heat transfer buffer part (11) composed of partition wall (30) defining the preheater evaporator and partition wall (47) defining the carbon monoxide cutdown unit, disposed opposite to each other with a spacing therebetween.

Description

technical field [0001] The present invention relates to a fuel cell system comprising: a hydrogen generator for producing hydrogen-rich reformed gas using hydrocarbon-based fuel such as city gas or LPG as a raw material gas; and power generation using hydrogen produced by the hydrogen generator fuel cell. Background technique [0002] The main components of the fuel cell system are a hydrogen generator that produces a hydrogen-rich reformed gas, and a fuel cell that generates electricity using the hydrogen produced by the hydrogen generator. [0003] In addition, the hydrogen generation device is equipped with a reformer that uses hydrocarbon-based fuel such as city gas or LPG as a raw material gas, and generates hydrogen, methane, and carbon monoxide (10 %), carbon dioxide, and water vapor reformed gas; the carbon monoxide removal unit removes carbon monoxide, which has a poisoning effect on the fuel cell, from the reformed gas. Here, when a solid polymer fuel cell is use...

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Problems solved by technology

[0009] Then, there arises a problem as follows: When the temperature distribution of the carbon monoxide reducer 10 in the above-mentioned form is large in the direction perpendicular to the flow direction of the reformed gas, then although it is preferable to The outlet temperature in the converter is about 200°C as described above, but there may be a part lower than 200°C in the thickness direction of the outlet of the carbon monoxide reducer 10, so that there will be a part that is lower than 200°C. A catalyst that does not contribute to the reaction of carbon monoxide may not be able to sufficiently remove carbon monoxide by the carbon monoxide remover 10

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