Fly ash recycling gasification furnace

A method of operating a fly ash recycling gasification furnace, comprising:

• introducing crude syngas containing ash from a waste boiler into an ash remover to obtain crude syngas and fly ash;
• discharging the crude syngas from a top of the ash remover;
• introducing the fly ash into a fly ash storage tank from a bottom of the ash remover;
• introducing the fly ash into a variable pressure lock hopper when the fly ash storage tank reaches a first maximum level;
• stopping the fly ash from entering the variable pressure lock hopper when the fly ash storage tank reaches a first minimum level;
• opening a first relief valve of an exhaust filter to release pressure;
• closing the first relief valve when the fly ash storage tank reaches the first maximum level;
• pressurizing the variable pressure lock hopper to a predetermined pressure after the fly ash stops entering the variable pressure lock hopper;
• introducing the fly ash into a fly ash blending system;
• stopping the fly ash from entering the fly ash blending system when the variable pressure lock hopper reaches a second minimum level;
• opening a second relief valve of the exhaust filter to release pressure, and closing the second relief valve after pressure relief is completed;
• opening a balance pipeline valve between the variable pressure lock hopper and the fly ash storage tank to balance pressure;
• purging fly ash collected by the exhaust filter into the fly ash blending system by high pressure nitrogen when the exhaust filter reaches a second maximum level;
• and
• introducing the fly ash into a hearth of the gasification furnace through a fly ash burner for another combustion cycle after the fly ash is blended by the fly ash blending system.