| 摘要 |
Boiler with burner for liquid or gaseous fossil fuels, with a baffle located ahead of the burner that causes vortices in the combustion gases, in which a flame guiding tube (4) surrounding the burner flame (3), and made of an at least partially open-pored foamed ceramic material, is located between the burner (1) and the baffle (2). The flame guiding tube (4) has three zones (A, B, C) of differing porosity, with the two outer zones (A, C) having essentially the same porosity, and the central zone (B) have a lesser porosity and being provided with a closed outer skin. A disc of open-pored foamed ceramic material may be provided in the passage of the flame guiding tube (4). Between the flame guiding tube (4) and the baffle (6, 7), another plate, of smaller extent than the baffle (6, 7), is located as a scattering plate (8); it may be provided with penetrations (9) for passage of the combustion gas, or be made of foamed ceramic. The parts may be made of a catalytic material (in the sense of effecting the conversion of noxious substances in the flue gas), or coated with a material with such a catalytic effect. <IMAGE>
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