Secondary-cyclone flying ash treatment method

Abstract

The invention relates to the technical field of flying ash treatment, in particular to a secondary-cyclone flying ash treatment method. By the adoption of the secondary-cyclone flying ash treatment method, the carbon conversion rate of secondary-cyclone flying ash can be improved, catalysts carried by the secondary-cyclone flying ash can also be efficiently recycled, and the defects that in the prior art, because the secondary-cyclone flying ash is difficult to return to a gasification furnace for secondary combustion, the carbon conversion rate is lowered, and serious environmental pollution is caused are overcome. The secondary-cyclone flying ash treatment method comprises the steps that firstly, in the presence of a digestion agent and a gasification agent, the secondary-cyclone flying ash is used as fuel and treated through chemical looping combustion, and meanwhile, the catalysts carried by the secondary-cyclone flying ash perform an ion exchange reaction with the digestion agent, so that ash residues containing the soluble catalysts are obtained; and secondly, water processing is conducted on the ash residues containing the soluble catalysts, and then the soluble catalysts are recycled. The secondary-cyclone flying ash treatment method is used for treating the secondary-cyclone flying ash.

Description

technical field [0001] The invention relates to the technical field of fly ash treatment, in particular to a treatment method of two-rotation fly ash. Background technique [0002] In the coal catalytic gasification process, the outlet of the gasifier is usually equipped with at least two cyclone processors, which are used to recover and gasify the fly ash produced in the coal catalytic gasification reaction to improve the carbon conversion rate, and the first-stage cyclone processor The separated fly ash particles are larger and can be directly returned to the gasifier for secondary gasification, while the fly ash particles separated by the secondary cyclone processor are finer (usually less than or equal to 0.2mm), due to the In a high-pressure environment, it is difficult to return the secondary fly ash to the gasifier for secondary gasification, and the reactivity is poor, which often results in the ineffective circulation of the fly ash in the gasifier and is discharged...

AI Technical Summary

Problems solved by technology

[0002] In the coal catalytic gasification process, the outlet of the gasifier is usually equipped with at least two cyclone processors, which are used to recover and gasify the fly ash produced in the coal catalytic gasification reaction to improve the carbon conversion rate, and the first-stage cyclone processor The separated fly ash particles are larger and can be directly returned to the gasifier for secondary gasification, while the fly ash particles separated by the secondary cyclone processor are finer (usually less than or equal to 0.2mm), due to the In a high-pressure environment, it is difficult to return the secondary fly ash to the gasifier for secondary gasification, and the reactivity is poor, which often results in the ineffective circulation of the fly ash in the gasifier and is discharged to the outside of the gasifier; At the same time, there is a large amount of potassium catalyst in the fly ash that needs to be recovered. Due to the fine particles of the fly ash, high carbon content, and poor wettability with water, it is difficult to recover the catalyst in the fly ash. In this way, when the fly ash is directly The carbon conversion rate of coal catalytic gasification is low and the consequences of serious environmental pollution

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