Fluidized combustion and mobile pyrolysis double-furnace compounded circulating fluidized bed

Abstract

The invention relates to a fluidized combustion and mobile pyrolysis double-furnace compounded circulating fluidized bed. The fluidized combustion and mobile pyrolysis double-furnace compounded circulating fluidized bed comprises a gasification furnace, a gasification agent guide pipe and a slag discharging guide pipe; a circulating gasification furnace is arranged at the upper part of the gasification furnace, and a fixed gasification furnace is arranged at the lower part of the gasification furnace; an air distribution plate is arranged at the lower part of the circulating gasification furnace, a furnace core is arranged under the air distribution plate; the upper end of the furnace core is connected with the lower end of the air distribution plate; a gasification agent channel is arranged in the furnace core, and a gasification agent penetrates through the air distribution plate and enters the circulating gasification furnace to circularly gasify feed coal; an annular channel is arranged between the outer edge of the air distribution plate and the upper furnace body; an annular space between the outer side of the furnace core and the lower furnace body is a pyrolyzing furnace chamber of fixed the gasification furnace; the upper part of the pyrolyzing furnace chamber is an annular channel, and the lower part of the pyrolyzing furnace chamber is provided with an air distribution grate; a semicoke falling from thecirculating gasification furnace enters the pyrolyzing furnace chamber, and the gasification agent enters the pyrolyzing furnace chamber through the air distribution grate to re-gasify the fallen semicoke; and generated high-temperature coal gas enters the upper furnace chamber through the annular channel, and gasified slag is discharged through the slag discharging guide pipe. The circulating fluidized bed is high in carbon conversion rate, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a circulating fluidized bed for compound gasification of double furnaces, in particular to a circulating fluidized bed for realizing compounding of two different gasification processes in the same furnace cavity, and belongs to the technical field of coal gasification. Background technique [0002] In my country's energy structure, coal still occupies half of the country, so the research and development of clean and efficient utilization of coal has great practical significance. Clean coal gasification utilization is the most critical technology. The widely used gasification process equipment is fixed bed gasifier and fluidized bed gasifier. The fixed bed gasifier has high carbon conversion rate and thermal efficiency, but the production process will A large amount of tar and phenol water are produced, which do not meet the requirements of environmental protection; the fluidized bed gasifier can produce clean gas without produc...

AI Technical Summary

Problems solved by technology

Clean coal gasification utilization is the most critical technology. The widely used gasification process equipment is fixed bed gasifier and fluidized bed gasifier. The fixed bed gasifier has high carbon conversion rate and thermal efficiency, but the production process will A large amount of tar and phenol water are produced, which do not meet the requirements of environmental protection; the fluidized bed gasifier can produce clean gas without producing phenol pollutants, which meets the requirements of environmental protection, but the coal feed and slag discharge are in the same furnace chamber in the gas production process After completion, a large amount of semi-coke is discharged with slag, resulting in low carbon conversion rate and pollution to the environment

For large-scale fluidized bed gasifiers, people often build supporting power plants to burn semi-coke discharged with slag. This method requires large investment and high cost, and is not suitable for small and medium-sized enterprises to carry out technological transformation and equipment transformation and upgrading.

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