Patent ID: 8414668

Claim:
A starting method of a coal gasifier in which pulverized coal is transferred to an inside of a furnace by an inert transfer gas to gasify coal thrown into the furnace, the coal gasifier being provided with a reductor burner at an upper side of the coal gasifier for supplying fuel that is pulverized coal to a reduction furnace which performs coal gasification reaction, a combustor burner located below the reductor burner for supplying the fuel that is pulverized coal to a combustion furnace which generates heat, and a slag tap below the combustor burner without a start-up burner starting up an operation of the furnace below the slag tap, the method comprising: letting air into the combustor burner to activate an igniter installed in the combustor burner; after the igniter is activated, supplying a flammable gas for starting-up the furnace to a part way of a fuel supply passage for supplying pulverized coal while pulverized coal supply to the combustor burner is stopped so as to ignite the flammable gas; starting to supply a transfer gas that transfers the pulverized coal after a temperature of the inside of the furnace reaches a first predetermined temperature at which the pulverized coal can be ignited; reducing a supply rate of the transfer gas so as to have a flow velocity in the coal fuel supply passage for the combustor burner raised to be within a predetermined stable transfer flow velocity range of the pulverized coal by the transfer gas and the flammable gas; starting the pulverized coal supply when the flow velocity reaches the stable transfer flow velocity range; and increasing supply rates of the pulverized coal and the transfer gas while reducing a flow rate of the flammable gas to replace the flammable gas by the transfer gas, so that a start-up combustion is shifted to a normal operation combustion performed by the pulverized coal and the transfer gas.