Dual-medium turbulent fluidized bed gasification incinerator and implementation method of waste gasification incineration

A dual-medium turbulent fluidized bed (TFB) gasification incinerator, comprising:

• an incinerator body, a gas-solid separator, a waste heat recovery device, and an incinerator body support, the incinerator body, the gas-solid separator, and the waste heat recovery device being all sequentially interconnected,
• wherein the incinerator body comprises a gasification section, a combustion section, and a heat exchange section that are all sequentially connected from bottom to top, the bottom of the gasification section being provided with a first air distribution device and having a slag discharge outlet, the gasification section comprising an upper variable cross-section segment, an equal cross-section segment, and a lower variable cross-section segment arranged from upper, middle to lower level, the upper variable cross-section segment having a cross-sectional area gradually increasing from top to bottom, and the lower variable cross-section segment having a cross-sectional area gradually decreasing from top to bottom, wherein the cross-sectional area of the upper variable cross-section segment is not less a cross-sectional area of the combustion section, the combustion section being provided with secondary air distribution devices on sides of the combustion section;
• wherein a furnace wall of the gasification section and a furnace wall of the combustion section are both water walls, a furnace wall of the heat exchange section connecting indirectly with the furnace wall of the combustion section, an outer surface of the furnace wall of the combustion section being provided with a connection part, the heat exchange section comprising at least one stage of heat exchange furnace wall, two adjacent stages of heat exchange furnace walls being arranged vertically and connecting with each other indirectly, an inner surface of each stage of the heat exchange furnace wall being provided with a set of heat conduction oil coil pipes, a flow direction of a heat conduction oil in each set of heat conduction oil coil pipes being bottom-in and top-out, the heat exchange section having a hot flue gas outlet at the top of the heat exchange section, and the hot flue gas outlet being connects with the waste heat recovery device via the gas-solid separator;
• wherein the waste heat recovery device comprises a heat conduction oil pipe row, an economizer, and an air preheater that are all arranged sequentially from top to bottom, a hot air outlet of the air preheater being connected to at least one of an air inlet of a gasification section and an air inlet of a combustion section;
• and
• wherein the incinerator body support comprises a steel frame body and at least one layer of support plate, the steel frame body and the at least one layer of support plate being interconnected with each other, the at least one layer of the support plate being higher than the connection part and facing the incinerator body, each of the at least one layer of the support plate supporting one stage of the heat exchange furnace wall and the heat conduction oil coil pipes arranged at the inner surface of the heat exchange furnace wall of the one stage, a flexible connection seal being provided between the two adjacent stages of heat exchange furnace walls and between the heat exchange furnace wall and the furnace wall of the combustion section, and an incinerator body portion of the gasification section and an incinerator body portion of the combustion section being connected to the steel frame body via the connection part by suspension arrangement.