Granular flue gas denitration agent and preparation method thereof

Abstract

The invention discloses a granular flue gas denitration agent and a preparation method thereof, and belongs to the field of in-furnace denitration. The specific method comprises the steps of dissolving an organic matter in water to prepare an organic matter aqueous solution, coating the organic matter aqueous solution on the surface of solid urea in a spraying manner to form an organic matter coating layer, and then coating an inorganic matter on the outer surface of the organic matter coating layer to form an inorganic matter coating layer, thereby obtaining the granular flue gas denitration agent. The flue gas denitration agent prepared by the method not only avoids the defects caused by using a liquid reducing agent, but also enables the solid urea to be slowly released due to coating of the organic matter layer and the inorganic matter layer, so that the service time of the denitration agent is prolonged, and the denitration rate is improved.

Description

technical field [0001] The invention relates to the field of furnace denitrification, in particular to a granular flue gas denitrification agent and a preparation method thereof. Background technique [0002] In the existing industrial production, the emission of high-temperature flue gas is basically accompanied by the emission of various nitrogen oxides. Nitrogen oxides are harmful to the human body and can cause acid rain. In order to alleviate the pressure on the environment, the national emission requirements for nitrogen oxides It is also becoming more and more stringent. At present, there are mainly two control methods for nitrogen oxides, one is selective catalytic reduction (SCR), and the other is selective non-catalytic reduction (SNCR). The reaction conditions of the former are compared with Mild, but requires a catalyst to react the nitrogen oxides in the flue gas with a reducing agent to produce harmless nitrogen, which, in the absence of a catalyst, reacts with...

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Problems solved by technology

[0003] However, in the prior art, the reducing agent in the process of using SNCR to treat flue gas is generally in a liquid state, such as ammonia water or urea solution. When ammonia water or urea solution enters the furnace, it will undergo an atomization process, and will be vaporized and decomposed in contact with high-temperature flue gas. Relying on diffusion and flue gas flow, the NH 3 and NO X Mixing, but during the liquid atomization process, part of the flue gas temperature will drop in the furnace and the atomization will be insufficient, and some liquid droplets will fall down or float up to the water wall, causing corrosion and perforation of the pipeline, and the furnace needs to be shut down for maintenance; NH in droplets 3 After being vaporized, it has no penetrating power and will be taken away with the smoke in the vaporization area, resulting in NH 3 and NO X Mixing will be worse

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