A Circulating Fluidized Bed/Bubbling Fluidized Bed Coupled Pressurized Oxygen-enriched Combustion Device

Abstract

The invention discloses a circulating fluidized bed / bubbling fluidized bed coupled pressurized oxygen-enriched combustion device. The circulating fluidized bed / bubbling fluidized bed coupled pressurized oxygen-enriched combustion device comprises a circulating fluidized bed / bubbling fluidized bed coupled hearth, an air chamber, an air distribution plate, a cyclone separator, a return feeder, an external heat exchanger, a buried pipe heating face and a screen type heating face; the hearth adopts graded air supply and graded coal supply, the buried pipe heating face is arranged in the dense-phase zone, a lean-phase zone outlet is connected to the cyclone separator, the cyclone separator is used for separating solid materials in smoke gas in the hearth outlet, and the materials enter the return feeder and the external heat exchanger. The device is suitable for combustion of solid fuel under pressurizing and high inlet oxygen concentration, and advantages of a bubbling fluidized bed and acirculating fluidized bed can be achieved. The buried pipe heating face with the high capacity utilization rate is arranged on the bubbling and fluidizing area of the lower portion of the hearth, thelimited arrangement of the heating face can be effectively solved, and through graded coal supply, graded air supply and graded return feeding, the furnace temperature and in-furnace temperature distribution can be effectively controlled.

Description

technical field [0001] The invention relates to a circulating fluidized bed / bubbling fluidized bed coupled pressurized oxygen-enriched combustion device. The invention relates to the technical field of circulating fluidized bed combustion, in particular to the technical field of pressurized circulating fluidized bed oxygen-enriched combustion. Background technique [0002] The combustion of fossil fuels inevitably produces CO 2 As the representative greenhouse gas, a large amount of greenhouse gas emissions have had a serious impact on the global climate. Thermal power stations are an important industry that consumes fossil energy, and the installed capacity of coal-fired power stations in my country accounts for more than 70% of China's power station industry. Therefore, my country urgently needs to find a CO2 suitable for coal-fired power plants. 2 capture technology. CO in existing coal-fired power plants 2 Among capture technologies, oxyfuel combustion (also known as...

AI Technical Summary

Problems solved by technology

Combining the advantages of the bubbling fluidized bed, the device adds a buried pipe heating surface at its lower part, which effectively solves the problem of difficult layout of the oxygen-enriched combustion heating surface of the pressurized circulating fluidized bed.

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