Water tube boiler and it's combustion method

Details Water tube boiler and it's combustion method Water tube boiler and it's combustion method

1996-11-18

1999-04-20

Walberg, Teresa J.

Liquid heaters and vaporizers

Heat transmitter

122 18, F22B 2306

Patent

active

058948198

ABSTRACT:
A water tube boiler using jet flames is disclosed which is capable of achieving low CO-emission combustion without enlarging a size of a combustion chamber. The water tube boiler comprises a combustion chamber 1 in which jet flames are generated and rows 3a to 3e of water tubes inserted through the combustion chamber. The group of water tubes provides a portion thick with the water tubes and a portion empty of the water tubes in a cross-section perpendicular to the direction of the jet flames, and at least the space Sa as an empty portion continuously extends through said group of water tubes in the direction of the jet flames. In the space Sa as an "empty" portion provided between the rows 3b and 3d of water tubes, recirculating flows (shown by arrows) of a combustion gas are generated. The recirculating flows are entrained by the jet flames existing the portion "thick" with the water tubes. Consequently, rapid temperature decrease of the jet flames is prevented. This enables the jet flames to flow downstream while maintaining a CO oxidation promoting temperature of about 1,000 to 1,500.degree. C., thereby promoting CO oxidation reaction. Accordingly, residual CO of an exhaust gas is greatly reduced.

REFERENCES:
patent: 3638621 (1972-02-01), Craig
patent: 5050541 (1991-09-01), Kobayashi et al.
patent: 5259342 (1993-11-01), Brady et al.
patent: 5273001 (1993-12-01), Kayahara et al.
patent: 5353748 (1994-10-01), Kayahara et al.
patent: 5482009 (1996-01-01), Kobayashi et al.

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