Uniform flow-guiding pyrolysis reaction device for urea and high-temperature flue gas

Abstract

The invention discloses a uniform flow-guiding pyrolysis reaction device for urea and high-temperature flue gas. The device comprises a high-temperature flue gas inlet and a pyrolysis reaction chamber; and one side of the high-temperature flue gas inlet communicates with a flue gas pipeline, one end of the flue gas pipeline is provided with a heating chamber, and the bottom of the heating chamberis provided with a diffusion section. According to the device provided by the invention, a circular flow-guiding plate is arranged in the diffusion section, in the process of a pyrolysis reaction of the urea, the flue gas which enters the device can be effectively divided into a plurality of small gas flows through a plurality of flue gas flow-guiding openings in the circular flow-guiding plate, the small gas flows are uniformly released and enters the interior of the pyrolysis reaction chamber, a plurality of atomizing spray nozzles are equidistantly arranged and annularly distributed at thesurface of a urea atomizing spray gun, so that the spraying area of the urea solution can be effectively increased, the pyrolysis reaction of the urea solution molecules and the high-temperature fluegas is more full, and the uniformity of urea pyrolysis and the reaction efficiency of pyrolysis are greatly improved.

Description

technical field [0001] The invention relates to the technical field of urea pyrolysis, in particular to a uniform diversion and pyrolysis reaction equipment for urea high-temperature flue gas. Background technique [0002] With the rapid development of industrialization, nitrogen oxides (NOx) have become one of the main pollutants in the atmosphere. In the process of atmospheric nitrogen oxides treatment, the selective catalytic reduction technology (SCR) is mainly used for the treatment of nitrogen oxides. SCR Generally, there are three kinds of reducing agents, urea, ammonia water and liquid ammonia. Liquid ammonia is highly dangerous and generally not used as a catalyst. There are two processes for producing ammonia from urea, pyrolysis process and hydrolysis process. Due to the incompleteness of the hydrolysis reaction, the loss of ammonia gas or insufficient ammonia production reaction will lead to a decrease in denitrification efficiency, so ammonia production is usu...

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Problems solved by technology

[0003] However, in the traditional urea pyrolysis device, when the pyrolysis reaction is carried out, when the high-temperature flue gas and the sprayed urea solution are pyrolyzed, the reaction area of ​​the pyrolysis contact is small, and the sufficient pyrolysis reaction cannot be carried out, and the pyrolysis is uniform. The temperature will also be greatly reduced, and in the process of flue gas diversion, heat loss will occur. The temperature of the flue gas reaching the interior of the pyrolysis chamber will gradually decrease, and the time to participate in the pyrolysis reaction is shorter, which not only reduces the temperature of the pyrolysis Efficiency, but also cause a decline in the quality of urea pyrolysis

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