Water-tube boiler

Details Water-tube boiler Water-tube boiler

F - Mech Eng,Light,Heat,Weapons

24

H

F24H 1/40 (2006.01) F22B 21/06 (2006.01)

Patent

CA 2306406

The invention provides a water-tube boiler which allows further NOx reduction and CO reduction to be implemented with a simple construction of the boiler body itself, and which is improved in boiler efficiency. The water-tube boiler includes a first water tube array made up of a plurality of first water tubes arranged into an annular shape, a combustion chamber defined inside the first water tube array, a first opening defined at part of the first water tube array, a cooling water tube array made up of a plurality of cooling water tubes arranged into an annular shape in a zone within the combustion chamber where burning-reaction ongoing gas is present, gaps provided between adjacent cooling water tubes so as to permit the burning-reaction ongoing gas to flow through, a burning-reaction continuing zone, where burning reaction is continuously effected, provided between the cooling water tube array and the first water tube array, a second water tube array made up of a plurality of second water tubes arranged into an annular shape outside the first water tube array, and a gas flow passage provided between the first water tube array and the second water tube array, wherein in the gas flow passage, heat transfer area per unit space is larger on the downstream side than on the upstream side.

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