Method for denitrifying calcined flue gas of magnesite clinker

Abstract

The invention belongs to the field of calcined flue gas treatment, and relates to a method for denitrifying a calcined flue gas of a magnesite clinker. The method is used for preventing and controlling nitrogen oxide generated in the magnesite clinker calcination process in a manner of integrating source reduction, process control and terminal treatment. The method comprises the steps that a cleanfuel is adopted to replace a non-clean fuel, and generation of fuel type nitrogen oxide is reduced or avoided from the source; a primary calcining fire hole and a secondary calcining fire hole are formed in a shaft furnace to achieve staged combustion of the fuel; a flue gas recirculation technology is adopted, so that the generation amount of the thermal nitrogen oxide in the combustion processis reduced, and nitrogen oxide reduction in the combustion process is achieved; an ammonia spraying window is arranged at a proper position of a preheating section of the shaft furnace, and primary denitration treatment is conducted on the calcined flue gas in the furnace by adopting a selective non-catalytic reduction mode; the calcining fire holes are formed in a proper position of the shaft furnace to ensure a proper preheating and calcining zone height, so that the outlet flue gas temperature meets the selective catalytic reduction denitration temperature, and the terminal treatment of thenitrogen oxide is achieved.

Description

technical field [0001] The invention belongs to the field of calcination flue gas treatment, and in particular relates to a sintered magnesia calcination flue gas denitrification method based on the integration of source reduction, process control and end treatment. Background technique [0002] Magnesite resources are one of the characteristic resources in Liaoning Province, and its reserves account for about 20% of the world's total reserves and 85% of the country's total. Magnesia refractories are one of the leading products of magnesite, and its output and export volume rank first in the world. The main product forms of refractory magnesia raw materials in my country are light-burned magnesia, sintered magnesia, and fused magnesia, and their output accounts for about 50%, 36%, and 14% of the annual output of magnesia refractory raw materials. [0003] In the magnesia material industry, especially sintered magnesia, environmental problems such as air pollution are highli...

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Problems solved by technology

[0013] Aiming at the problems that the content of nitrogen oxides in the flue gas produced by the sintering magnesia process is difficult to meet the emission requirements, and the traditional denitrification method has low efficiency and high cost, the present invention provides a method that integrates source reduction, process control and end treatment. Prevention and control of nitrogen oxides in the flue gas generated during the calcination process of sintered magnesia

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