Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Patent
1991-05-02
1992-09-29
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
423239, B01D 4700, B01J 800, C01B 2100
Patent
active
051512564
ABSTRACT:
A coal combustion apparatus having prevented deterioration of a denitration catalyst due to volatile metal compounds contained in exhaust gases is provided, which apparatus comprises a combustion furnace, a denitration means for removing nitrogen oxides in an exhaust gas from the furnace by reducing nitrogen oxide with ammonia, a means for collecting ashes in the gas having left the denitration means and a means for recycling the collected ashes into the furnace, and is characterized in providing an oxygen concentration meter in the flow path of the gas between the furnace and the denitration means and also providing an oxygen concentration-controlling means relative to air fed inside the flow path of the gas from the furnace to the denitration means so as to control the oxygen concentration detected by the oxygen concentration meter to a definite value or higher.
REFERENCES:
patent: 3913323 (1975-10-01), August
patent: 4455281 (1984-06-01), Ishida et al.
patent: 4571329 (1986-02-01), Kato et al.
patent: 4844875 (1989-07-01), Eltehadieh
Akama Hiroshi
Kato Yasuyoshi
Konishi Kunihiko
Matsuda Toshiaki
Teshima Nobue
Babcock-Hitachi Kabushiki Kaisha
Heller Gregory A.
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