A solid fuel burner is provided with a nozzle that is provided around the central axis of the burner, that includes a straight tube section having an opening opposed to a furnace, and a curved tube section continuous with the straight tube section, and that sprays out, from the opening to the furnace, a fluid mixture which is of a solid fuel and carrier gas of the solid fuel and which is flowing in the curved tube section; a first swirler that gives the fluid mixture a swirl at the burner central axis side of the straight tube section; and a second swirler that gives, at the burner central axis side downstream of the first swirler, the fluid mixture a swirl opposite to that given by the first swirler.

A solid fuel burner is provided with a nozzle that is provided around the central axis of the burner, that includes a straight tube section having an opening opposed to a furnace, and a curved tube section continuous with the straight tube section, and that sprays out, from the opening to the furnace, a fluid mixture which is of a solid fuel and carrier gas of the solid fuel and which is flowing in the curved tube section; a first swirler that gives the fluid mixture a swirl at the burner central axis side of the straight tube section; and a second swirler that gives, at the burner central axis side downstream of the first swirler, the fluid mixture a swirl opposite to that given by the first swirler.

A steam generating system includes a furnace, a nozzle tip assembly for pulverized coal and primary air as well as means for conveying secondary air in the furnace. The nozzle according to the invention comprises a nozzle body (3) and several channels (5) being connected with the nozzle body, the channels are diverging from each other. At the exit faces (17) of the channels obstructions (13) are disposed to induce huge turbulences of the primary air when entering the furnace. Due to these turbulences the primary air and the entrained coal are mixed very well before being combusted in the furnace. This results in a better more effective combustion with reduced NOx- emissions.

A steam generating system includes a furnace, a nozzle tip assembly for pulverized coal and primary air as well as means for conveying secondary air in the furnace. The nozzle according to the invention comprises a nozzle body (3) and several channels (5) being connected with the nozzle body, the channels are diverging from each other. At the exit faces (17) of the channels obstructions (13) are disposed to induce huge turbulences of the primary air when entering the furnace. Due to these turbulences the primary air and the entrained coal are mixed very well before being combusted in the furnace. This results in a better more effective combustion with reduced NOx- emissions.

An ignition system includes a pulverized fuel pipe receiving a mixture of pulverized fuel and primary air for injection into a combustion chamber for combustion, and an igniter received within the pulverized fuel pipe for igniting the mixture. The igniter is axially movable within the pulverized fuel pipe.

An ignition system includes a pulverized fuel pipe receiving a mixture of pulverized fuel and primary air for injection into a combustion chamber for combustion, and an igniter received within the pulverized fuel pipe for igniting the mixture. The igniter is axially movable within the pulverized fuel pipe.

A combustion burner includes a plurality of splitters (5), (6), (7) configured to divide a fuel gas flow by a widened portion where a width of the widened portion increases as the widened portion extends in the direction of the fuel gas flow. The splitters include: slitted splitters (5), (6) configured to slits (SL) at a downstream end in the fuel gas flow; and non-slitted splitters (7) configured to adjacently to the slitted splitters (5), (6), each of the non-slitted splitters (7) configured to the widened portion at a downstream end in the fuel gas flow, and configured to a fixed width in a direction of the longitudinal axis.

A combustion burner includes a plurality of splitters (5), (6), (7) configured to divide a fuel gas flow by a widened portion where a width of the widened portion increases as the widened portion extends in the direction of the fuel gas flow. The splitters include: slitted splitters (5), (6) configured to slits (SL) at a downstream end in the fuel gas flow; and non-slitted splitters (7) configured to adjacently to the slitted splitters (5), (6), each of the non-slitted splitters (7) configured to the widened portion at a downstream end in the fuel gas flow, and configured to a fixed width in a direction of the longitudinal axis.

A steam generating system includes a nozzle assembly for pulverized coal and air, the coal nozzle assembly comprises an inner housing (3) for conveying primary air and coal and an outer housing (5) for conveying secondary air to an exit face (13) of a nozzle tip (1), wherein the outer housing (3) and the inner housing (5) are arranged coaxially and limit a channel (15) for the secondary air, wherein the cross-sectional area (A.sub.IH) of the inner housing (3) increases towards the exit face (13) of the nozzle tip (1), wherein the cross-sectional area (A.sub.OH) of the outer housing (5) decreases towards the exit face (13), and wherein bars (11) are located in the inner housing (3) near the exit face (13) that accelerate the velocity of the primary air and coal particles.

A steam generating system includes a nozzle assembly for pulverized coal and air, the coal nozzle assembly comprises an inner housing (3) for conveying primary air and coal and an outer housing (5) for conveying secondary air to an exit face (13) of a nozzle tip (1), wherein the outer housing (3) and the inner housing (5) are arranged coaxially and limit a channel (15) for the secondary air, wherein the cross-sectional area (A.sub.IH) of the inner housing (3) increases towards the exit face (13) of the nozzle tip (1), wherein the cross-sectional area (A.sub.OH) of the outer housing (5) decreases towards the exit face (13), and wherein bars (11) are located in the inner housing (3) near the exit face (13) that accelerate the velocity of the primary air and coal particles.