Abstract:
The burner device for high-temperature air combustion according to the present invention is equipped with a thermal insulation portion (5) that is provided facing a furnace (1) and has a throat (6); a burner nozzle (9) that is provided at the axial center of this throat and that injects a pulverized coal mixed flow (38) into the furnace through the throat; a windbox (8) that is provided so as to house this burner nozzle; an air register (16) that is provided at the distal end of the burner nozzle and that injects low-temperature secondary air from the windbox to the throat; a high-temperature air nozzle (23), one end of which opens into the furnace through the heat insulation portion; and a combustion air switching means (16, 24) that switches between injecting low-temperature secondary air to the throat through the air register and injecting high-temperature secondary air to the furnace interior through the high-temperature air nozzle, in which in steady combustion, low-temperature secondary air is injected to the throat through the air register by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, and in high-temperature air combustion, high-temperature secondary air is injected to the furnace interior through the high-temperature air nozzle by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle.
Abstract:
This invention relates to a method and device for converting energy by combustion of solid fuel, especially incineration of bio-organic fuels and municipal solid waste to produce heat energy and which operates with very low levels of NOx, CO and fly ash, in which that the oxygen flow in the first and second combustion chambers in at least one separate zone and by sealing off the entire combustion chambers in order to eliminate penetration of false air into the chambers, the temperatures in the first and second combustion chamber are strictly controlled, in addition to the regulation of the oxygen flow, by admixing a regulated amount of recycled flue gas with the fresh air which is being led into each of the chambers in each of the at least one separate zones, and both the recycled flue gas and fresh combustion gases are filtered in unburned solid waste in the first combustion chamber by sending the unburned solid waste and the gases in a counter-flow before entering the gases into the second combustion chamber.
Abstract:
PROBLEM TO BE SOLVED: To provide a highly reliable oxygen burning boiler, suppressing a cost required for conversion when a coal fired boiler operated as an existing air burning boiler is operated as the oxygen burning boiler, and enabling stable operation for a long time by preventing a damage of the oxygen burning boiler caused by high temperature gas. SOLUTION: In the oxygen burning boiler 1, installed are: an oxygen separating device 23 for manufacturing oxygen by separating air and feeding the oxygen to the oxygen burning boiler 1; and a recirculation fan 26 for feeding and recirculating part of exhaust gas discharged from the boiler to the oxygen burning boiler 1. A control device 150 is installed to calculate heat absorption amount obtained by steam in a furnace 1a from measurement values detected by steam, pressure and flow sensors 14c-14f installed in each heat exchanger of the furnace 1a of the oxygen burning boiler 1 and control the operation of the recirculation fan 26 so that the calculated heat absorption amount of the furnace 1a becomes intended set heat absorption amount. COPYRIGHT: (C)2011,JPO&INPIT