METHOD AND APPARATUS FOR CONTROLLING GASIFICATION IN CIRCULATING FLUIDIZED-BED GASIFICATION PLANT

摘要

PPROBLEM TO BE SOLVED: To enable a gasification plant to stably correspond to the change of the required amount for gasification gas by a gasified gas-utilizing apparatus, and the change of the required amount for steam by a steam-utilizing apparatus while maintaining the gasification efficiency and the installation-operating efficiency at the gasification in the optimum conditions. PSOLUTION: A method for controlling the gasification in a circulating fluidized bed gasification plant includes: previously obtaining the amount of a raw material to be fed to a gasification furnace 1, and the balance amount of the produced gasification gas amount and the produced steam amount when the gasification efficiency is kept optimum and when the retention time of the raw material in the gasification furnace and the amount of the steam to be fed to the gasification furnace are variable; feeding the raw material in the feed amount according to the set requirement 24 for the gasification gas to the gasification furnace 1; operating the retention time of the raw material in the gasification furnace 1 and the amount of the steam for the gasification; feeding air, in an amount sufficient for the combustion of char fed from the gasification furnace 1 to the combustion furnace 2, to a combustion furnace 2; feeding the water, in an amount sufficient for the recovery of waste heat of the combustion gas 4 from the combustion furnace 2, to a waste heat-recovering boiler 16; and feeding the steam, in an amount corresponding to the charged amount of the raw material in the steam 19 formed at the waste heat-recovering boiler 16, to the gasification furnace 1. PCOPYRIGHT: (C)2010,JPO&INPIT