| 摘要 |
A burner for pulverized, gaseous and/or liquid fuels having an ignition chamber possessing a wall diverging rotationally symmetrically in diameter and an outlet pipe adjoining thereto, according to the present invention comprises an outlet, disposed centrally in the chamber wall, of a pipe for feeding a fuel jet and a twisting air inlet surrounding this outlet for feeding combustion air in twisting motion, which produces inside the ignition chamber a hot recirculation flow. This hot circulation flow thoroughly mixes the fuel jet and heats it to ignition temperature. Only a portion of the total combustion air required can be introduced into the ignition chamber as twisting air via the twisting air inlet, and therefore in the region between the chamber wall and the outlet pipe a second air inlet is provided,through which a further combustion air portion, partially or entirely likewise mixing with the fuel jet, can be introduced into the ignition chamber. The sum of the combustion air portions participating inside the ignition chamber in the mixing with the fuel jet is adjusted to not more than 50% of the total combustion air required. The burner according to the invention is variable and flexible within very wide limits with respect to fuel type, calorific value of the fuel, and output rates. The flame of the burner is slender in form with small radial extraction. The burner will be useful for medium output requirements such as annealing and smelting furnaces, firing kilns for ceramic products and steam boilers. |
