Gasification fly ash grading resource utilization system and method

Abstract

The invention discloses a gasification fly ash grading resource utilization system and method. In order to solve the problems that gasified fly ash is low in volatile component content, higher in ash content, difficult to ignite directly, short in hearth retention time and the like, the invention provides a gasification fly ash grading resource utilization system and method. The system is divided into a flotation system, a pre-combustion system, a combustion system and a wall brick preparation system. According to the system, cyclic utilization of chemical reagents in a flotation system, pre-combustion of refined carbon, angle arrangement of a combustor in a hearth, angle arrangement of secondary air and surrounding air in the hearth, over fire air oxygenation treatment and heat energy utilization of smoke and water vapor are comprehensively considered, according to the system and method, high-value additional utilization of the refined carbon and tail ash is helpful in solving the problem that the gasified fly ash cannot be massively used for building materials due to too high carbon content, and is expected to solve the problems of aggravated abrasion of boiler equipment and the like caused by blending combustion of bituminous coal in a boiler by the gasified fly ash.

Description

technical field [0001] The invention belongs to the field of high-value utilization of solid waste treatment, and in particular relates to a gasification fly ash classification resource utilization system and method. Background technique [0002] Gasification fly ash is a by-product of coal gasification. During the gasification process, coal goes through the softening stage, the stage of forming semi-coke, the stage of strong softening and the stage of semi-coke breaking, and finally transforms into effective components mainly CO and H 2 The coarse coal gas is synthesized, while the fine coal powder particles are not completely burned, and the gasification fly ash suspension product is obtained after being treated by the scrubber and ash water under the action of the air flow. A flocculant (polyacrylamide) is usually added in the gray water treatment process to condense the residual solids and moisture together. The condensed solids of gasified fly ash include crystalline mi...

AI Technical Summary

Problems solved by technology

The current treatment method of gasification fly ash is mainly mixed with high volatile coal for blending and burning, but the combustion characteristics of gasification fly ash have changed after high temperature and chilling process, making it difficult to ignite and have poor burnout

Generally speaking, the carbon conversion rate of gasification fly ash fed into the boiler and coal is not high, and the carbon resources in gasification fly ash cannot be fully utilized by co-firing, resulting in waste of energy. High ash content will also cause problems such as increased wear and tear of the boiler, and the amount of fly ash in the flue gas will also increase accordingly, which will also cause considerable damage to the downstream economizer, dust removal and denitrification equipment, and air preheater

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