A kind of treatment method of two-rotation fly ash

Abstract

The invention relates to the technical field of fly ash treatment, in particular to a treatment method of two-rotation fly ash. The carbon conversion rate of the two-rotation fly ash can be improved, and at the same time, the catalyst carried in the two-rotation fly ash can be efficiently recovered. It overcomes the defects in the prior art that it is difficult to return the fly ash to the gasifier for re-combustion, which leads to a decrease in carbon conversion rate and serious environmental pollution. A treatment method for dirotary fly ash, comprising: step 1) in the presence of a digester and a gasification agent, treating the dicyclonic fly ash as fuel through chemical looping combustion, and meanwhile, the dicyclonic fly ash carries The catalyst and the digestion agent undergo an ion exchange reaction to obtain ash containing a soluble catalyst; step 2) washing the ash containing a soluble catalyst with water to recover the soluble catalyst. The embodiment of the present invention is used for the treatment of the secondary fly 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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