System for removing SO3 in exhaust gas by utilizing modified coal-fired fly ash and work method

Abstract

The invention relates to a system for removing SO3 in exhaust gas by utilizing modified coal-fired fly ash and a work method, and belongs to the field of industrial waste gas purification, environmentprotection and energy. The system comprises a boiler, a coal economizer, an SCR denitration reactor, an air pre-heater, a dust remover, an ultrasonic atomizing device and a modified fly ash sprayingdevice; the boiler, the coal economizer, the SCR denitration reactor, the air pre-heater and the dust remover are successively communicated, the modified fly ash spraying device is arranged between the SCR denitration reactor and the air pre-heater, and / or, the modified fly ash spraying device is arranged between the air pre-heater and the dust remover; the ultrasonic atomizing device is connectedwith the dust remover and the modified fly ash spraying device. According to the system, an integrated technology that a modifying agent is adopted to modify coal-fired fly ash, and then the modifiedcoal-fired fly ash is sprayed into a gas flue to remove SO3 in the exhaust gas is adopted, and the system can achieve the purposes of waste treatment by utilizing wastes, cyclic utilization and costreduction, adapt to new boilers or existing boilers, and achieve good environmentally friendly and economic benefits and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of industrial waste gas purification, environmental protection and energy, and particularly relates to a modified coal-fired fly ash for removing SO in flue gas. 3 systems and working methods. Background technique [0002] my country's coal-based energy structure will not change for a long time. Therefore, controlling the emission of coal-fired flue gas pollutants is an important task for my country's air pollution control. In the current situation where conventional flue gas pollutants in coal-fired power plants fully require ultra-low emissions, SO 3 Due to the lack of control means and great harm, the emission has attracted more and more attention from all parties, and it is imperative to control the emission. [0003] Flue gas SO currently entering industrial applications 3 Removal technologies include alkaline absorbent injection, low-low temperature electrostatic precipitator, wet electrostatic precipitator, ...

AI Technical Summary

Problems solved by technology

[0008] The object of the invention is to solve the SO 3 To solve the problem of emission control, a modified coal-fired fly ash is proposed to remove SO from flue gas 3 systems and working methods

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