Staged high-temperature combustion circulating fluidized bed system and combustion method

Abstract

The invention discloses a staged high-temperature combustion circulating fluidized bed system and a combustion method. The method and the system adopt a staged combustion technology. The system is divided into three stages along the hearth height direction and comprises a lower-part internal circulating fluidized bed combustion stage, a middle high-temperature suspension firing stage and an upper-part cooling stage; fuel (coal or organic waste) with a larger grain diameter is sent into the lower-part internal circulating fluidized bed combustion stage to combust at the temperature of 800-900 DEG C; coal with a smaller grain diameter is sent into the middle high-temperature suspension firing stage to combust at the temperature of 1000-1300 DEG C; and a screen-type heating surface is distributed on the upper part of a hearth at the hearth outlet temperature of 800-900 DEG C. The staged high-temperature combustion system of the invention can burn the coal and the organic waste, can carry out coal gasification, can improve combustion efficiency or gasification efficiency, also can solve the discharge problem of harmful substances, such as Dioxin and the like in the combustion process of the organic waste and has wide application prospect.

Description

technical field [0001] The invention relates to a segmented high-temperature combustion circulating fluidized bed system and a combustion method thereof, and is mainly suitable for use in industrial boilers for incineration of organic waste, coal gasification or combustion with a particle size of less than 3mm. Background technique [0002] At present, due to the constraints of temperature, air volume and furnace space and other factors, circulating fluidized bed boilers are prone to generate dioxins (PCDDs) when incinerating organic matter such as garbage, causing serious environmental pollution and endangering human health; when coal gasification When the temperature is low, the gasification reaction efficiency is low; when coal with a particle size of less than 3 mm is used for combustion, it is difficult to separate and recycle a large amount of unburned small particle coal, and the combustion efficiency is reduced. The reason for the above problems is that the combustio...

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Problems solved by technology

[0005] In order to overcome the shortcomings of traditional circulating fluidized bed boilers such as dioxins (PCDDs) emissions when burning organic waste, low efficiency when coal gasification, and low efficiency when burning small-size coal, the present invention provides a segmented high-temperature combustion cycle The fluidized bed system can improve the combustion efficiency or gasification efficiency, and can also solve the problem of dioxin and other harmful emissions during the combustion of organic waste

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