A processing method for circulating fluidized bed boiler fly ash

Abstract

The invention relates to a processing method for boiler fly ash, specifically relates to a processing method for circulating fluidized bed boiler fly ash and belongs to solid waste recycling utilization technology field. The method allows the circulating fluidized bed boiler fly ash, especially the circulating fluidized bed boiler desulphurization fly ash to first do surface modification by a regulator, so as to improve the effect of sort in the friction electrification separator, separate the uncombusted charcoal and fly ash in the fly ash and obtain the fly ash with very low charcoal content and the charcoal rich product with very high charcoal content. The sorted high charcoal content charcoal rich product can directly return into the fluidized bed boiler to burn and the same time the cycle multiplying power can be decreased or the product can be used to prepare active carbon and other charcoal products or used as normal fuels; and the sorted low charcoal content fly ash can be used as cement, concrete, brick, ceramsite, filling material and other raw materials.

Description

technical field [0001] The invention relates to a treatment method of boiler fly ash, in particular to a treatment method of circulating fluidized bed boiler fly ash, belonging to the technical field of solid waste resource utilization. Background technique [0002] At present, my country's raw coal production and consumption are very large. It is not only a major coal producer, but also a major emitter of fly ash (also known as fly ash). The disposal of fly ash not only occupies a lot of land, but also seriously pollutes the environment and wastes resources. In particular, the utilization rate of desulfurization fly ash of fluidized bed boilers is still very low, and the carbon content in the fly ash of fluidized bed boilers is relatively high, which has a certain impact on the utilization of fly ash and causes a lot of waste of energy resources, so there is The fluidized bed boiler will recirculate and burn the dust removal fly ash, but if the circulation rate is too high,...

AI Technical Summary

Problems solved by technology

[0002] At present, my country's raw coal production and consumption are very large. It is not only a major coal producer, but also a major emitter of fly ash (also known as fly ash). The disposal of fly ash not only occupies a lot of land, but also seriously pollutes the environment and wastes resources.

In particular, the utilization rate of desulfurization fly ash of fluidized bed boilers is still very low, and the carbon content in the fly ash of fluidized bed boilers is relatively high, which has a certain impact on the utilization of fly ash and causes a lot of waste of energy resources, so there is The fluidized bed boiler will recirculate and burn the dust removal fly ash, but if the circulation rate is too high, it will affect the combustion and operation of the boiler. Therefore, the best way to deal with the fluidized bed boiler fly ash is to reduce the carbon content, which makes the construction and cement industry It can be accepted, and at the same time, valuable carbon resources can be recovered and used as raw materials such as fuel and activated carbon adsorbent

At present, wet separation methods such as flotation are used to decarbonize fly ash, and the products need to be dehydrated and dried, which requires a complex wastewater treatment system. At the same time, the activity of recovered carbon and fly ash is affected by the wet separation process. Influence, post-processing is required, the production process is complicated and the cost is high