GASIFICATION SYSTEM
A coal gasification system includes a coal gasifier that allows, for example, coal, as carbonaceous solid fuel, to react in the furnace with a gasifying agent (for example, air or oxygen) to generate combustible gas from the coal, a pulverized coal supply device (solid fuel supply means) that pulverizes the coal into a fine powder form and charges the coal into the coal gasifier, and an ash supply device (ash supply means) that charges ash of the coal (pulverized coal) to an inside of the coal gasifier. The ash supply device is configured to recharge slag that is generated when the pulverized coal is gasified in the coal gasifier and is discharged, into the coal gasifier as the ash. The slag is melted in a combustor to be molten slag, and adheres to an inner wall of the combustor to function as a refractory material.
1 - 9 . (canceled)
10 . A gasification system, comprising:
a gasifier that allows carbonaceous solid fuel to react in the furnace with a gasifying agent to generate combustible gas from the carbonaceous solid fuel;
a solid fuel supply means that pulverizes the carbonaceous solid fuel into a fine powder form and charges the carbonaceous solid fuel into the gasifier;
an ash supply means that charges ash of a carbonaceous raw material to an inside of the gasifier; and
a control unit that controls the ash supply means,
wherein, in order to ensure heat resistance of the gasifier, the control unit controls the ash supply means so that an amount of the ash that is generated from the coal gasifier becomes a target ash generation amount with a predetermined ratio with respect to a total charge amount of the carbonaceous solid fuel.
11 . The gasification system according to claim 10 ,
wherein the ash supply means is configured to recharge ash that is generated when the carbonaceous solid fuel is gasified in the gasifier and is discharged, into the gasifier, as the ash.
12 . The gasification system according to claim 10 ,
wherein the ash supply means is configured to charge ash that is generated in another combustion system into the gasifier, as the ash.
13 . The gasification system according to claim 10 ,
wherein the ash supply means is configured to be able to charge both of ash that is generated when the carbonaceous solid fuel is gasified in the gasifier and is discharged, and ash that is generated in another combustion system, into the gasifier, as the ash.
14 . The gasification system according to claim 13 ,
wherein the ash that is charged into the gasifier is 2 to 50% in weight ratio with respect to a charge amount of the carbonaceous solid fuel.
15 . The gasification system according to claim 10 ,
wherein the ash supply means is configured to pulverize the ash into a fine powder form and recharge the ash to the inside of the gasifier together with the carbonaceous solid fuel.
16 . The gasification system according to claim 10 ,
wherein the target ash generation amount is about 2 to 10% in weight ratio with respect to a charge amount of the carbonaceous solid fuel.
17 . The gasification system according to claim 10 ,
wherein the ash is slag obtained after the carbonaceous solid fuel reacts in the gasifier.