System for controlling the flow pattern of a recovery boiler

Details System for controlling the flow pattern of a recovery boiler System for controlling the flow pattern of a recovery boiler

D - Textiles, Paper

21

C

D21C 11/12 (2006.01) F23G 7/04 (2006.01) D21C 11/14 (2006.01)

Patent

CA 2467101

The invention relates to a system for controlling the flow field in a soda recovery boiler, said soda recovery boiler comprising at least a furnace (1), primary air ports (4) in the lower part of the furnace, so-called secondary combustion air ports (5) disposed above these, black liquor spray nozzles (6) placed similarly above these and combustion air ports (5b) disposed above the black liquor spray nozzles (6). According to the invention, the soda recovery boiler is provided with substantially thin jets (7, 7a, 7b) supplying energy into the flow field and having a jet pressure in the nozzle equal to at least twice the jet pressure in the combustion air ports (5, 5b).

Système permettant de réguler le champ d'écoulement d'une chaudière de récupération de soude, ladite chaudière comportant au moins un four (1), des orifices d'air primaires (4) situés dans la partie inférieure du four, des orifices d'air de combustion secondaires (5) placés au-dessus des précédents, des buses de pulvérisation (6) de liqueur noire placées au-dessus des orifices d'air de combustion secondaires et des orifices d'air de combustion (5b) placés au-dessus des buses de pulvérisation (6) de liqueur noire. Selon la présente invention, ladite chaudière de récupération de soude est dotée de jets (7, 7a, 7b) essentiellement minces destinés à apporter de l'énergie dans le champ d'écoulement et ayant une pression de jet dans la buse qui est égale à au moins deux fois la pression de jet dans les orifices d'air de combustion (5, 5b).

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