Fluidized bed reactor for gasifying inferior coal with high ash content and low activity

Abstract

The invention discloses a fluidized bed reactor for gasifying inferior coal with high ash content and low activity. The fluidized bed reactor comprises a reactor main body, which is internally provided with a gas distribution plate, wherein the gas distribution plate divides the reactor main body into a dense phase zone and a gas chamber, a gasifying agent jet pipe and a residue discharge pipe arealso arranged on the gas distribution plate, and a powder coal inlet is formed in one position of the dense phase zone. According to the invention, by independently arranging the gasifying agent jetpipe and the residue discharge pipe, the adaptability to high-ash coal is improved; and by arranging the residual carbon combustion burner for discharging residue and circulating coke powder, the carbon conversion rate of low-activity inferior coal is greatly improved, and the efficient gasification of low-activity inferior coal is realized.

Description

technical field [0001] The application belongs to the technical field of fluidized bed gasification, and in particular relates to a fluidized bed reactor for gasifying inferior coal with high ash content and low activity. Background technique [0002] my country's energy structure is more coal and less oil. Therefore, using coal-based raw materials to produce chemical products plays a vital role in reducing the country's dependence on oil and improving energy security. Coal-to-gas is an important technology to realize coal-based chemical industry Rely on. [0003] So far, there have been a large number of coal gasification reactors of different schools at home and abroad. According to reaction time and reaction intensity, coal gasification reactors are divided into fixed-bed reactors, entrained-bed reactors and fluidized-bed reactors. [0004] Fixed-bed reactors are mainly represented by Lurgi furnaces, which need to use high-quality lump coal or chemical coke as raw materi...

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Problems solved by technology

[0007] my country's steam coal and low-quality anthracite account for a very large proportion. This part of coal has a large ash content and poor activity, so it is not suitable for fixed-bed reactors and entrained-bed reactors.

Therefore, there is a wide living space for fluidized bed reactors with wider adaptability to coal types, but the theory of fluidized bed reactors is more complicated and the operation is more difficult. At present, industrialized fluidized bed reactors are mainly based on gas Gasification of high-activity lignite and long-flame coal, and few examples of gasification of high-ash and low-activity bituminous coal

[0008] For gasifying bituminous coal with high ash content and low activity, the fluidized bed reactor still has the following problems: First, the gasification agent distribution plate is very easy to leak ash, resulting in ash accumulation in the gas chamber, which affects the gas distribution effect of the gasification agent. It brings safety hazards to the equipment; secondly, the ash discharge intensity of the lower slag outlet is very high, and the current two-in-one structure of the slag discharge pipe and the gasification agent jet pipe can easily cause corrosion and wear of the slag discharge pipe, jet pipe, and classifier , causing the shutdown of the device, seriously affecting the long-term stable running time of the fluidized bed reactor

This method mainly uses chemical methods to process raw coal. For large-scale coal chemical plants, the workload is relatively large.

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