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AssigneesThe Kansai Electronic Power Company Inc., Hirakawa Iron Works, Ltd.
InventorsYasuhiko Suesada, Takashi Moriyama, Junichi Sugioka, Hiroshi Tahara
Estimating the term…
A watertube boiler for all types of boilers including natural circulation, forced circulation and one-through types. The boiler includes a plurality of heat absorption water tubes forming a heat absorption watertube unit in the furnace. The heat absorption watertube unit comprises a relatively dense arrangement of heat absorption water tubes disposed in the combustion path of the burner, such that the flame of the burner impinges on the unit. The heat absorption watertube unit can be arranged in the first stage of a watertube boiler having at least one additional furnace stage receiving exhaust gas from the first stage. The additional stage can be disposed either perpendicularly and horizontally, and the air/fuel mixture in each stage is maintained at a specificied ratio to optimize combustion of the fuel. A method of operating a watertube boiler having three stages is also provided. By using the watertube boiler and method, the generation of nitrogen oxides can be controlled and the volume of the boiler can be reduced.
A watertube boiler, comprising:
A method of operating a watertube boiler having three stages arranged in series with respect to each other and operatively connected to receive exhaust gas from a preceding stage, each said stage having a furnace, at least one burner, and a plurality of heat absorption water tubes arranged in a relatively dense arrangement in said furnace, said method comprising the steps of:
Dependencies are inferred from the claim text.