Ishikawajima-harima Heavy Industries Co., Ltd.

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Minoru Narisoko

Satoshi Inoue

Mikio Kiyotomo

A method of combustion and a fluidized bed incinerator for burning and decomposing refuse such as municipal wastes are disclosed. The refuse is fluidized together with a fluidizing medium such as sand and primary air, to form a fluidized bed where the refuse is burned and decomposed. The pyrolysis gas produce by thermal decomposition of the refuse is combusted with secondary air supplied to the incinerator. By controlling the temperature inside the fluidized bed so as to be maintained in the range from 520.degree. to 650.degree. C., stable combustion is achieved, despite changes in the volume of refuse added to the fluidized bed, and the unburned pyrolysis gas and smut densities in the exhaust gas are decreased. Temperature control is achieved by spraying water onto the fluidized bed. The combustion air ratio can be reduced because the refuse can be stably combusted, and the temperature of pyrolysis gas inside the combustion chamber can be maintained at a high level.

Method and apparatus for stable combustion in a fluidized bed incinerator

A method of stable combustion in a fluidized bed incinerator for burning and decomposing refuse such as municipal wastes while fluidizing them is disclosed. A number of air diffuser tubes are provided inside the incinerator body for fluidizing the refuse and the fluidizing medium. The fluidizing air from the air diffuser tubes is supplied at high speed or low speed from each of the tubes respectively. By alternately forming more and less fluidized areas inside the fluidized bed, the refuse is stably burned. Because of the stable combustion of the refuse, the combustion air ratio can be reduced and the combustion chamber temperature inside the incinerator can be maintained at a high level.

Method of stable combustion for a fluidized bed incinerator

A method for combusting combustible gases generated by thermal decomposition of refuse in a fluidized bed incinerator is disclosed. The refuse is fluidized, together with a fluidizing medium such as sand, by the primary air, burned and decomposed. The pyrolysis gas produced by the decomposition of the refuse is completely burned by the secondary air introduced into the combustion chamber of the incinerator in a grid-shaped pattern, in multiple stages. The noncombustible gas and smut densities within exhaust gas are also reduced. Additionally, the combustion chamber temperature can be maintained at a high level as a result of the secondary combustion being carried out quickly.

Method of promoting secondary combustion in a fluidized bed incinerator

A method of catalystless denitrification for a fluidized bed incinerator to remove NOx generated in burning refuse such as municipal wastes as the refuse is fluidized in a fluidized bed incinerator is disclosed. The refuse is fluidized together with fluidizing medium such as sand along with primary air, and is thermally decomposed and/or burned. The combustible gases generated by pyrolysis are burned with the secondary air blown into the incinerator in a lattice work arrangement. A denitrification agent is mixed in a part of the secondary air, and the NOx present in the combustion gas is removed without using catalysts.

Method of catalystless denitrification for fluidized bed incinerators

A waste product feeder in which when waste products are charged through a hopper into a trough are transported by a screw and then discharged, they are successively scraped by a scraper in a predetermined quantity or volume.

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Matsudo, Japan

Minoru Narisoko