US 5,081,940 AGranted

Waste disposal method and apparatus

AssigneeIshikawajima-Harima Heavy Industries Co., Ltd.

InventorsTakehiko Motomura, Hitoshi Hagihara, Satoshi Inoue

Life of this patent

Estimating the term…

Loading patent…

Abstract

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.

Claims23

Dependent claims

A method of incinerating refuses, using a main incinerator which combusts the refuses, the main incinerator having an inlet through which the refuses are fed into the main incinerator and an outlet through which the refuses are discharged from the main incinerator, comprising the steps of:

(A) transferring the refuses through the main incinerator;
(B) feeding air into the main incinerator to combust the refuses;
(C) melting ashes produced upon the combustion of the step (B) by use of unburned carbon contained in the ashes;
(D) detecting a temperature of gas at the refuse inlet of the main incinerator;
(E) detecting a point at which the combustion of the step (B) ends in the main incinerator (which point is called "burn-out point");
(F) determining a relation among an amount of the unburned carbon contained in the ash, the gas temperature at the refuse inlet and the burn-out point;
and
(G) adjusting a speed of the refuses transferred through the main incinerator of the step (A) and adjusting a flow rate of air of the step (B) in a manner such that the temperature detected at the step (D) and the point detected at the step (E) fall in respective predetermined ranges to control the amount of the unburned carbon to a desired value.

5 more elements

Dependencies are inferred from the claim text.