System and method for upgrading and utilizing coal gasification fine slag based on particle size classification

Abstract

The invention discloses a system and method for upgrading and utilizing coal gasification fine slag based on particle size classification. The method includes the steps that the coal gasification fineslag is fed into a classifying cyclone, a high-frequency vibrating screen, and a high-frequency laminated vibration fine screen for classification, classified products are respectively fed to a filter press and a drum dryer for dry dehydration, and the dried products are respectively fed to a brick kiln / ceramic kiln, a coal machine / activated carbon production equipment and a fluidized bed boilerfor comprehensive utilization. Comprehensive utilization by classification and quality is carried out based on the general law that the carbon content of different granular products in the coal gasification fine slag continuously decreases with the decrease of the particle size and according to the granularity and carbon characteristics of different granular products, the process is simple, the quality improvement effect is good, the resource utilization level of the gasification fine slag can be effectively improved, and the pollution of the gasification fine slag to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of solid waste resources treatment in coal chemical industry, and in particular relates to a system and method for upgrading and utilizing coal gasification fine slag based on particle size classification. Background technique [0002] In recent years, the coal chemical industry has developed rapidly; coal gasification is the leading process in the entire coal chemical industry, and a large amount of gasification ash is produced. Due to the equipment performance or operation level of the gasifier, the carbon content of the gasification ash currently ranks first Not high enough. Gasification ash mainly includes: gasification coarse slag and gasification fine slag; among them, the composition of gasification coarse slag is similar to that of boiler ash and can be used as a blending raw material for building materials, roads and bridges; gasification fine slag is due to the carbon content High (dry base carbon...

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Problems solved by technology

[0003] At present, the conventional treatment method of gasification fine slag is landfill treatment, which not only wastes land, but also cannot realize the reduction and harmless utilization of resources. Therefore, such methods as flotation, production of activated carbon, combustion treatment, and use as soil additives have been developed. However, there is no large-scale application at present. A big reason is that the characteristics of the gasification fine slag cannot achieve the best match with the above-mentioned processes, and it is impossible to realize the application according to the material.

Taking the production of activated carbon as an example, the gasification fine slag needs to have a large specific surface area and developed porosity, but due to the high ash content of the gasification fine slag, its preparation is more difficult

If it is burned directly, it will not be able to realize high value-added utilization

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