Waste incineration disposal method

A waste incineration disposal method comprising steps of:

• combusting a part of a waste contained in a gasification furnace, and dry-distilling the other part of the waste by a combustion heat;
• and introducing a combustible gas generated by the dry distillation into a combustion furnace to combusted the combustible gas,
• wherein when the combustible gas is combusted in the combustion furnace, oxygen required for the combustion is supplied to the combustion furnace in accordance with an amount of the combustible gas introduced into the combustion furnace to combusted the combustible gas, an amount of oxygen supplied to the gasification furnace is controlled in accordance with a temperature change in the combustion furnace caused by the combustion of the combustible gas in the combustion furnace, the amount of the combustible gas generated by the dry distillation is adjusted, and the temperature in the combustion furnace is maintained at a first preset temperature or more, said waste incineration disposal method further comprising steps of:
• containing in the gasification furnace the waste regulated to generate the combustible gas having a heat amount for setting the temperature in the combustion furnace at the first preset temperature or more, combusting fuels other than the combustible gas in the combustion furnace prior to ignition of the waste, igniting the waste to start dry distillation and combusting the generated combustible gas with the other fuels when the temperature in the combustion furnace reaches the first preset temperature or more, and finishing the combustion of the other fuels when the temperature in the combustion furnace reaches a second preset temperature higher than the first preset temperature or more by the combustion of only the combustible gas;
• maintaining the temperature in the combustion furnace to be substantially constant at the second preset temperature or more by combusting only the combustible gas;
• resuming the combustion of the other fuels and combusting the combustible gas with the other fuels when the temperature in said combustion furnace falls below a third preset temperature lower than the substantially constant temperature and higher than the first preset temperature, maintaining the temperature in the combustion furnace at the first preset temperature or more, and finishing the combustion of the other fuels when the temperature in the gasification furnace falls below a fourth preset temperature, wherein said fourth preset temperature is lower than a maximum temperature in the gasification furnace.