LOW-EMISSION VORTEX FURNACE

摘要

The proposed low-emission vortex furnace is intended for use in burning organic fuel and can be used most effectively for burning dust. The proposed low-emission vortex furnace comprises a combustion chamber (1) with a cold prismatic funnel (5) which has a slit aperture, and a device (7) positioned underneath the funnel and used for introducing the bottom blast. The furnace contains at least one burner (2) in the form of at least two fuel-air mixture feed ducts (2a, 2b), one duct lying above the other. Each of the ducts (2a, 2b) is provided with a device (3, 4) for adjusting the fuel/air ratio; this device ensures that the ratio of air to fuel in the upper duct (2a) is always higher than in the lower duct (2b). The longitudinal axes of the ducts (2a, 2b) are advantageously inclined so that the angle between the longitudinal axis of the lower duct (2b) and the projection of that axis onto the furnace wall is less than in the case of the upper duct (2a). The furnace may also be provided with a device (8) for feeding fuel of a particular fractional composition into each duct. During operation of this furnace, three operational zones are formed in the furnace chamber, namely, an ignition and active combustion zone; a reduction zone; and a re-heating zone. This reduces the quantities of nitrogen oxides produced while ensuring that the furnace is highly economical to operate.