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A system and method for grading and resource utilization of gasification fly ash

A resource-based, fly ash technology, applied in combustion methods, climate sustainability, indirect carbon dioxide emission reduction, etc., can solve problems such as insufficient utilization of carbon resources, air preheater damage, increased boiler wear, etc. The effect of reducing the burning time, reducing the ignition point and saving heat energy

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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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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  • A system and method for grading and resource utilization of gasification fly ash

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Embodiment Construction

[0029] In order to make the above objects, features and advantages of the present invention more concise and easy to understand, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The core idea of ​​the present invention is: using a cyclone-microbubble flotation bed to separate the residual carbon and ash contained in the gasification fly ash, and after deep processing to obtain refined carbon and tail ash, the refined carbon uses a W-type flame boiler The refined carbon is burned out, and the tail ash assists other fine aggregates to prepare wall bricks, the flue gas generated by the W-type flame boiler and the steam generated by heating at the end of the boiler to maintain the prepared wall bricks to achieve full utilization of solid waste resources and energy the goal of.

[0031] see figure 1 , The present invention provides a classification and resource utilization system of gasif...

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Abstract

The invention discloses a system and a method for resource utilization of gasification fly ash by classification. Aiming at the problems of low volatile content of gasification fly ash, high ash content, difficulty in direct ignition, and short furnace residence time, the present invention proposes a system and method for grading and resource utilization of gasification fly ash. The system is subdivided into flotation system, pre-combustion system, combustion system and wall tile preparation system. The angle arrangement of the secondary air and the perimeter air in the furnace, the oxygenation treatment of the exhausted air, the thermal energy utilization of the flue gas and water vapor. The high-value additional utilization of the refined carbon and tail ash in the present invention is helpful to solve the problem that the gasification fly ash cannot be used in a large amount for building materials because the carbon content is too high, and it is also expected to solve the problem of mixing the gasification fly ash in the boiler. Burning bituminous coal leads to problems such as increased wear and tear of boiler equipment.

Description

technical field [0001] The invention belongs to the field of high-value utilization of solid waste treatment, and particularly relates to a system and method for grading and resource utilization of gasification fly ash. Background technique [0002] Gasification fly ash is a by-product obtained from coal gasification. During the gasification process, coal goes through a softening stage, a semi-coke formation stage, a strong softening stage and a semi-coke cracking stage, and finally converted into effective components mainly CO and H. 2 The synthetic crude gas is produced, while the finer pulverized coal particles are released together with the crude gas under the action of the airflow, and the gasification fly ash suspension product is obtained after the washing tower and the grey water treatment. A flocculant (polyacrylamide) is usually added in the grey water treatment process to agglomerate the residual solids and moisture together, wherein the agglomerated solids of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/32B09B3/38F23D1/02F23J15/06F23L1/00F23L7/00F23L9/00F26B20/00B28B11/24
CPCF23D1/02F23J15/06F26B20/00F23L1/00F23L9/00F23L7/007B28B11/24Y02E20/34
Inventor 车得福王彦成王长安高昕玥刘虎薛景文
Owner XI AN JIAOTONG UNIV
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