| 摘要 |
PCT No. PCT/EP97/06179 Sec. 371 Date May 3, 1999 Sec. 102(e) Date May 3, 1999 PCT Filed Nov. 3, 1997 PCT Pub. No. WO98/20287 PCT Pub. Date May 14, 1998Apparatus for heating fluid, comprising a first supply for supplying fuel, a second supply for supplying oxidizing agent, a burner for combusting fuel and oxidizing agents after mixing thereof and a first heat exchanger to be heated by flue gases of the burner and arranged belically round the burner.
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