Ishikawajima-harima Heavy Industries Co., Ltd.

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Takehiko Motomura

Satoshi Inoue

Hitoshi Hagihara

Tokihiko Ishikawa

Waste is combusted by an incinerator and becomes an ash. The ash is transferred to a melting furnace to be melt therein. The ash contains unburned carbon and the melting at the melting furnace is influenced by an amount of the unburned carbon. The amount of unburned carbon largely depends on a gas temperature at an waste inlet of the incinerator and an waste burn-out point in the incinerator. The waste disposal method, using the incinerator and the melting furnace, comprises the steps of detecting the gas temperature at the waste inlet of the incinerator, detecting the burn-out point of waste combustion in the incinerator, controlling a waste transfer speed in the incinerator and controlling a flow rate of air fed into the incinerator such that the detected temperature and burn-out point remain within repsective predetermined ranges, which in turn brings the amount of the unburned carbon remaining in the ash to a desired value, whereby the melting at the melting furnace is controlled to a desired melting.

Waste disposal method and apparatus

A hearth arrangement for a furnace which melts refuses carried on the hearth arrangement comprises a plurality of hearth blocks arranged like a stair. The heart blocks are inclined stepwise in a refuse carrying direction and each hearth block has a width direction perpendicular to the refuse carrying direction. Each hearth block is divided into two block elements in the width direction of the hearth block and the two block elements are joined to each other by springs which exerts a biasing force on the block elements in the width direction of the hearth block. A clearance is formed between each two adjacent hearth blocks to tolerate heat expansion of the hearth blocks. Each block has a protuberance extending over a next hearth block located in the ash carrying direction such that the ash does not flow into the clearance between the hearth blocks. A convex portion is formed on a contacting plane of one block element and a concave portion is formed in a contacting plane of the other block element such that the convex portion engages with the concave portion to ensure a tight engagement of two block elements.

Hearth arrangement for melting furnace

An incinerator with a moving-bed stoker in which a chain conveyor is inclined in the direction of its movement and a plurality of fuel- or fire-bed members L-shaped in cross section are mounted on the links of the chain conveyor, whereby a step-like moving fuel- or fire-bed is defined. Each fuel- or fire-bed member comprises an upright or vertical plate and a horizontal plate and combustion air injection holes are formed through the upright or vertical plate so that the foreign matter such as ash, metal pieces or the like as well as the molten ash produced as the result of the combustion of waste with a low melting point can be prevented from falling through the combustion air holes into the stoker.

Growing community of inventors

Funabashi, Japan

Takehiko Motomura