| 摘要 |
In a steel heating-boiler with a downdraught burner (5) arranged in a combustion chamber (6), there is arranged below the combustion-chamber bottom (10) a heat exchanger (17) which is passed through by approximately vertical waste-gas ducts (13 or 48) and approximately horizontal water ducts (21 or 40) which run one above another in different planes, the flow direction of the water in the water ducts (21 or 40) changing by plane. In order to develop such a steel heating-boiler (1) designed as a cross counterflow device into a condensation heating boiler with great efficiency, the heat exchanger (17) is in the region of the combustion chamber (6) designed as a pure counterflow heat exchanger, the inlet (25) of which is arranged at the bottom in the burner axis (56) and the outlet (9) of which is arranged peripherally. The waste-gas path of the heat exchanger (17) can be formed by square tubes (13) welded to one another in regions and divided according to height by plates (20) which form the water ducts (21) running one above another. The heat exchanger (17) can, however, also be composed of stamped or edged metal sheets (42, 52, 58, 59) which delimit water ducts (40) and waste-gas ducts (48). <IMAGE>
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