Reverse-blowing tribo-electrostatic separation method and device for fly ash decarburization

Abstract

The invention relates to a reverse-blowing tribo-electrostatic separation method and device for fly ash decarburization. Negative pressure is generated in a nozzle through airflow generated by a negative pressure system, and fly ash particles enter the nozzle through a negative-pressure sucking pipe; fly ash is blown into a gas-solid mixed pipeline under the action of the airflow to form gas-solid two-phase flow, and the fed particles are mixed evenly; the fly ash particles in the gas-solid two-phase flow are subjected to frictional collision when passing a triboelectric charging device so as to carry charges which are opposite in polarity and unequal in electric quantity, the fly ash particles enter a high-voltage static separation chamber and deflect under the action of electric field force, and ash particles and carbon particles in the fly ash are separated; at the same time, reverse-blowing airflow opposite to electrified fly ash particles in moving direction is applied to the electrified fly ash particles in the separation process, particles with large charge mass quickly deflect to achieve rapid separation, particles with small charge mass fall down in a decelerated mode under the action of the reverse-blowing airflow, the staying time of the particles in the high-voltage static separation chamber is increased, and the particles are further separated under the action of electric field force.

Description

technical field [0001] The invention relates to a back-injection triboelectric separation method and device for fly ash decarbonization, which are used in the field of mineral processing engineering, in particular to the technical field of fly ash friction electric separation and decarbonization. Background technique [0002] Fly ash is an industrial solid waste in the power industry. It is extremely harmful to discharge into the atmosphere. It will not only cause serious dust pollution around the power plant, but also easily be carried by dust or sandstorms to expand the scope of pollution and threaten public health. Economic construction and ecological environment had a great impact. For every 100,000 tons of fly ash discharged by a medium-sized power plant in my country, it has to pay an emission fee of about several million yuan, while the same amount of fly ash discharged in Europe has to pay about 3 to 4 times the fee. Research and development of comprehensive utiliza...

AI Technical Summary

Problems solved by technology

When the charge is relatively small, the particles receive the weak electric field force, and cannot move in time and are not easy to separate. The charged particles stay in the high-voltage electrostatic field for a short time, which makes the effect of triboelectric decarbonization of fly ash poor. ,low efficiency

At the same time, too much or too little feeding will also affect the particle friction and collision effect

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