Abstract The known exhaust boiler of the type that a high-pressure superheater, a high-pressure steam generator, a high-pressure economizer, a low-pressure steam generator and a low-pressure economizer are disposed sequentially from the upstream side within an exhaust gas flow passageway, and a denitrification apparatus is disposed upstream of the high-pressure economizer, is improved so as to achieve maximum heat recovery regardless of whether or not sulfur oxides are contained in the exhaust gas, in that a bypass duct is connected to the exhaust gas passageway at a position downstream of the high-pressure economizer and upstream of the low-pressure steam generator, and dampers are disposed respectively within the bypass duct and at a position within the exhaust gas passageway downstream of the connecting point of the bypass duct and upstream of the low-pressure steam generator.
In an exhaust boiler in which a high-pressure superheater, a high-pressure steam generator, a high-pressure economizer, a low-pressure steam generator and a low-pressure economizer are disposed sequentially from the upstream side within an exhaust gas flow passageway, and a denitrification apparatus is disposed upstream of said high-pressure economizer the improvement wherein: a bypass duct is connected to said exhaust gas passageway at a position downstream of said high-pressure economizer and upstream of said low-pressure steam generator; and dampers are disposed respectively within said bypass duct and at a position within said exhaust gas passageway downstream of the connecting point of said bypass duct and upstream of said low-pressure steam generator.
Claim 2
Dependent Claim
110 words
In an exhaust boiler in which a high-pressure superheater, a high-pressure steam generator, a high-pressure economizer, a low-pressure steam generator and a low-pressure economizer are disposed sequentially from the upstream side within an exhaust gas flow passageway, and a denitrification apparatus is disposed upstream of said high-pressure economizer the improvement wherein: a bypass duct is connected to said exhaust gas passageway at a position downstream of said high-pressure economizer and upstream of said low-pressure steam generator; and dampers are disposed respectively within said bypass duct and at a position within said exhaust gas passageway downstream of the connecting point of said bypass duct and upstream of said low-pressure steam generator.
Claim 3
Dependent Claim
18 words
An exhaust boiler as claimed in claim 1, wherein said exhaust boiler is of the horizontal flow type.
Claim 4
Dependent Claim
18 words
An exhaust boiler as claimed in claim 1, wherein said exhaust boiler is of the vertical flow type.