Tube-in-shell heating apparatus

A heating apparatus consisting of a heating chamber with a bottom having an opening portion in an upper part thereof, a cover body provided at the top portion of said heating chamber, a plurality of heat-exchanger pipe bodies inserted along a vertical direction at predetermined intervals in said heating chamber in diametral directions of the heating chamber, a can plate provided in the lower part of said cover body so as to block the opening portion of said heating chamber and also to support said pipe bodies, a plurality of sheets of baffle plates arranged so as to form a labyrinth stretching vertically in a row in said heating chamber and having said pipe bodies penetrate therethrough, a combustion gas inflow port provided at a bottom portion of the heating chamber on a sidewall adjacent to said bottom portion and having an opening portion at the bottom portion of said heating chamber and an exhaust gas outflow port provided in an upper part of said heating chamber on a sidewall adjacent to said upper part and having an opening portion in the upper part of said heating chamber, comprising:

• a main catalytic combustion equipment located outside of said heating chamber and connected to said combustion gas inflow port;
• a plurality of partition plates provided in said heating chamber so as to partition said labyrinth into a plurality of chambers vertically;
• and
• a plurality of auxiliary catalytic combustion equipments provided so as to connect said chambers on the lower side and the upper side of respective partition plates.