Catalytic combustion apparatus

A catalytic combustion apparatus, comprising:

• a mixed gas supply portion for mixing fuel with air;
• a porous first catalyst body provided downstream of said mixed gas supply portion;
• a porous second catalyst body provided downstream of said first catalyst body;
• a heat exchange portion having a heated fluid passage, said heat exchange portion being provided on a peripheral portion of the catalytic combustion apparatus;
• a radiant heat reception portion connected to said heat exchange portion,
• in which gas flow resistance per unit area of said first catalyst body is smaller than gas flow resistance per unit area of said second catalyst body;
• and
• wherein said second catalyst body has a shape that is the same as a shape of said first catalyst body.

A catalyst combustion apparatus, comprising:

• a mixed gas supply portion for mixing fuel with air;
• a porous first catalyst body provided downstream of said mixed gas supply portion;
• a porous second catalyst body provided downstream of said first catalyst body;
• said second catalyst body having a shape that is the same as a shape of the first catalyst body, and said first and second catalyst bodies being free-of fins extending within each catalyst body;
• a heat exchange portion having a heated fluid passage, said heat exchange portion being provided on a peripheral portion of the catalytic combustion apparatus;
• and
• a radiant heat reception portion connected to said heat exchange portion,
• in which a heat exchange coefficient of said first catalyst body is larger than a heat exchange coefficient of said second catalyst body.