Smoke SCR denitration system for fluidized fuel gas kiln

Abstract

The invention provides a smoke SCR denitration system for a fluidized fuel gas kiln. The smoke SCR denitration system comprises a reaction chamber and a mixing chamber located below the reaction chamber. An air distributor is arranged between the reaction chamber and the mixing chamber, air caps on the air distributor are ranked in an equilateral triangle mode, and the necks of the air caps are provided with small air cap holes, wherein the included angles between the small air cap holes and the horizontal cross section range from 5 degrees to 15 degrees. Catalyst granules are distributed on the upper surface of the air distributor, carriers of the catalyst granules are ceramic granules with the diameter ranging from 0.1 mm to 5 mm, and coating materials are SCR denitration active materials. The stack height of the catalyst granules is 2 to 6 times that of the air caps. According to the smoke SCR denitration system, the specific surface area of the catalyst granules is large, the catalyst granules continuously circulate vertically and turn over under the effect of mixed airflow flowing upwards and the gravity of the catalyst granules, the catalyst granules more intensively and more completely make contact with and are mixed with smoke / ammonia gas mixed gas in the fluidization process compared with that in traditional technology, the catalysis effect is better, and denitration efficiency is more than 99%.

Description

technical field [0001] The invention relates to the technical field of flue gas pollutant treatment, in particular to an SCR denitrification system for fluidized gas furnace flue gas. Background technique [0002] At present, flue gas denitrification technology based on Selective Catalyst Reduction (SCR) has been widely used due to its high denitrification efficiency, good selectivity, and stable operation. The principle of this technology is that in the presence of a catalyst, the NOx (nitrogen oxides, including NO and NO) in the flue gas 2 ) with injected NH 3 (Ammonia gas) undergoes a chemical reaction to produce harmless N 2 and H 2 0, the chemical reaction formula is as follows: [0003] [0004] However, the current domestic SCR system has always had the following problems to be solved: [0005] (1) The specific surface area of ​​the catalyst is small. [0006] Catalysts used in engineering mainly include honeycomb type, flat plate type and corrugated type acc...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a fluidized gas-fired furnace flue gas SCR denitrification system to solve technical problems such as small specific surface area of ​​catalyst, large volume of denitrification reactor, real-time adjustment of catalyst dosage, and difficulty in maintaining normalized catalytic activity in the reaction chamber.

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