Abstract: One embodiment relates to a burner, comprising a fuel pipe, a fuel nozzle, at least one ignition and/or heat source and a pipe which conducts an oxygen-containing gas and/or recirculated flue gas, wherein the at least one ignition and/or heat source is arranged in the burner interior and is in the form of or comprises an electric heating and/or ignition device via which, exclusively by conversion of electrical current into heat energy, the amount of heat energy required within the burner for the initiation and continuation of the initial pyrolysis and ignition is generated and/or provided in the burner interior. A stabilizing ring with toothed ring may be a constituent part of the electric heating and/or ignition device arranged in the mouth region of the fuel nozzle.

Abstract: One embodiment relates to a burner, comprising a fuel pipe, a fuel nozzle, at least one ignition and/or heat source and a pipe which conducts an oxygen-containing gas and/or recirculated flue gas, wherein the at least one ignition and/or heat source is arranged in the burner interior and is in the form of or comprises an electric heating and/or ignition device via which, exclusively by conversion of electrical current into heat energy, the amount of heat energy required within the burner for the initiation and continuation of the initial pyrolysis and ignition is generated and/or provided in the burner interior. A stabilizing ring with toothed ring may be a constituent part of the electric heating and/or ignition device arranged in the mouth region of the fuel nozzle.

Abstract: A shutoff device is provided for pulverized coal burners of a pulverized coal furnace. Each burner has a primary tube that conveys a pulverized coal/air mixture and is connected with a feed line for supplying the mixture to the respective burner. Disposed in the feed line, for closing off the same, is a slide valve that is provided with a valve plate. On the trailing side of the slide valve, the feed line is surrounded by an air receiver that is supplied with air. In the vicinity of the air receiver, an opening is provided in the wall of the feed line and can be closed off by a closure plate, which is synchronously actuatable with the slide valve such that in the closed position of the slide valve the opening is opened, and in the open position of the slide valve the opening is closed off.

Abstract: A shutoff device is provided for pulverized coal burners of a pulverized coal furnace. Each burner has a primary tube that conveys a pulverized coal/air mixture and is connected with a feed line for supplying the mixture to the respective burner. Disposed in the feed line, for closing off the same, is a slide valve that is provided with a valve plate. On the trailing side of the slide valve, the feed line is surrounded by an air receiver that is supplied with air. In the vicinity of the air receiver, an opening is provided in the wall of the feed line and can be closed off by a closure plate, which is synchronously actuatable with the slide valve such that in the closed position of the slide valve the opening is opened, and in the open position of the slide valve the opening is closed off.

Abstract: A burner for the combustion of coal dust in which a stream of primary air and coal dust mixture is conducted through a dust conduit connected to a primary dust tube. A secondary air tube surrounds the primary dust tube, and a tertiary air tube surrounds the secondary air tube. The secondary and tertiary air tubes are connected to a helically-shaped input housing, and a conically flared section extends from each of the secondary and tertiary air tubes. An angular momentum is applied in the dust conduit divides the primary air and coal dust mixture into high-dust and low-dust partial streams, so that the high-dust partial stream flows through the primary dust tube, and the low-dust partial stream flows through the primary gas tube.

Abstract: The process for combustion of coal dust with combustion air in burners and for reducing the production of NO.sub.x during the combustion. Combustion air is fed to the burners in form of primary air and secondary air. The burners are supplied coal dust through the primary air in a mixture of coal dust and primary air. A primary gas is generated with combustible gaseous components from the mixture of coal dust and primary air, through pyrolysis of the coal dust in the ignition region of the burners. In the ignition region, there is lowered the mean ratio of oxygen components in the primary gas to the oxygen amount required to burn freely released combustible gaseous components of the primary gas by reducing the oxygen component in the primary gas and/or injecting the primary gas with a combustible external gas.

Abstract: A method of burning coal with less than 10% volatiles in a burner supported by air. The coal is pulverized in a pulverizer and supplied to the burner mixed with a vehicle in the form of air. The object is more reliable ignition. The coal is separated from the air before it enters the burner and is combined into a new mixture with heated air. The second mixture is forwarded at a higher temperature and with a lower level of coal. The coal is separated from the second mixture and combined into a third mixture with heated air. The third mixture is forwarded at a higher temperature and with a higher level of coal.

Abstract: A burner for burning powdered fuel in air. The air is divided into concentric annular currents. A tube (6) conveys primary air or gas. The tube is surrounded by another tube (12). The second tube conveys secondary air. The exit of the primary-air tube inside the secondary-air tube is surrounded by an annular baffle (26). The baffle is open at each end, has secondary air flowing through it, and extends axially beyond the primary-air tube as much as 25% of the tube's outside diameter. The thickness of the gap (25) between the primary-air tube and the baffle is at least 1.5% of that diameter.